Foot operable door opener

Abstract

A foot operable door opener operates, without using one's hands, and without an electrical assist. The entrance cycle is initiated by stepping on a pedal. This force drives the pedal a ¼ turn, engaging a soft wheel to open the door. The pedal is hard linked to a crank arm which goes into a unidirectional crank shaft hub to turn the wheel. The downward pressure from the pedal pivots a ratcheted hinge connected to a bracketed spring-loaded wheel assembly to keep constant pressure to the ground. A gear box or multiple pumps of the pedal turns the wheel two or more 360 degrees rotations, opening the door to allow the entrant to pass until the foot pedal is dis-engaged. This action releases the ratcheting hinge mechanism, allowing the spring assisted wheel assemble to rotate to its original up position, releasing the wheel from the ground, allowing the door to close.

Claims

1. A foot operable door opener comprising: a crank assembly comprising a crank arm rotated from a starting position before any operations by depression of a foot pedal, with a foot or cane, for rotating a crank shaft, which, in turn activates a spring assembly connected to said crank arm through said crank shaft for winding at least one main spring, said at least one main spring being wound by said crank assembly, said at least one main spring being at least one wound spring to develop a stored potential energy and manifested power to perform the work required to open a door, said stored potential energy power and manifested power being transferred to a gear train with a preselected speed increasing ratio for transferring said stored potential energy and manifested power from said at least one main spring to a drive wheel assembly; said drive wheel assembly comprising an appropriate durometer drive wheel or a pneumatic drive wheel connected to a main drive shaft; a traction tension assembly actuated by said foot pedal for winding said at least one main spring for rotating said crank shaft for swinging said door open; a return spring mounted on said crank shaft for returning said crank shaft to said starting position; and, whereby an entrant is able to open said door without use of hands or electrical assistance.

2. The foot operable door opener as in claim 1 further comprising a delay assembly for a delayed release of said stored potential energy and manifested power of said at least one main spring to said main drive shaft in order to allow safe ergonomic transfer of the weight of the entrant to both feet, allowing the entrant to step aside to clear the path of the swinging of said door.

3. The foot operable door opener of claim 2 in which said delay assembly is selected from the group consisting of a dashpot or a spring-loaded pneumatic cylinder, or a pneumatic cylinder, or combinations thereof compressed by said crank shaft when said foot pedal and said crank arm are depressed, said spring loaded pneumatic cylinder having an adjustable needle valve, or a fixed orifice restrictor, for allowing air to escape from a compressed chamber in said pneumatic cylinder, regulating said delay assembly which releases said stored potential energy and manifested power from said at least one main spring and starts a cycle of said drive wheel turning without losing any of said stored potential energy and manifested power.

4. The foot operable door opener as in claim 3 wherein an escaping pressure is released from said compressed chamber of a single-acting pin cylinder through said fixed orifice restrictor or through said adjustable needle valve, regulating said delay, and wherein as said escaping pressure is released, said delay assembly releases said stored potential energy and manifested power of said at least one main spring and releases rotation of said crank shaft and said drive wheel.

5. The foot operable door opener of claim 3 in which said spring-loaded pneumatic cylinder has a piston and is connected to at least one of said spring-loaded plunger or said dashpot, said spring-loaded plunger is engaged, activated by a pressure a pawl which engages a ratcheting wheel or sprocket, which is directly connected to said drive wheel, wherein metered release of said pressure within said compressed chamber of said pneumatic cylinder through said fixed orifice restrictor causes delay of said spring-loaded plunger, to retract and release said ratcheting wheel or sprocket, or combinations thereof, releasing said stored potential energy and manifested power from said at least one main spring with said delay, and starts said cycle of said drive wheel turning without losing any of said stored potential energy and manifested power.

6. The foot operable door opener of claim 2 wherein said delay assembly includes a friction clutch to restrain said drive wheel for said fixed orifice regulator or said adjustable needle valve for a variable length of time, or a dampener, to mechanically regulate said spring-loaded plunger depressing said pawl which engages a ratcheting wheel or sprocket which itself is directly connected to said drive wheel, whereby said escaping pressure is released within said pneumatic cylinder causes said spring-loaded plunger to release said ratcheting wheel or sprocket, or combinations thereof, and releases said stored potential energy and manifested power from said at least one main spring within said delay assembly and starts said cycle of said drive wheel turning without losing any of said stored potential energy and manifested power.

7. The foot operable door opener of claim 6 wherein said dampener is said dashpot.

8. The foot operable door opener of claim 6 in which said traction tension assembly is additionally actuated when said crank arm is depressed, rotating said main drive shaft and causing a depressing arm to pull down a bracket arm, engaging a spring-loaded mechanism held down by a locking pawl, or combinations thereof, causing a constant downward pressure for a predetermined length of travel, to accommodate an undercut under said door, a threshold, and/or any slope or variation in the path of travel of said foot operable door opener.

9. The foot operable door opener of claim 8 wherein an activation pin hits an activation trigger when said at least one main spring unwinds, at an end of rotation of said at least one main spring, releasing said locking pawl and said spring-loaded mechanism raising up said drive wheel back to said starting position ready for the next said cycle of said drive wheel turning again, by depressing said foot pedal by the entrant without losing any stored potential energy and manifested power.

10. The foot operable door opener of claim 9 wherein a further delay sequence assembly is retrofitted onto said activation trigger so that said further delay from said delay assembly is provided on both ends of said door opening and a door closing said cycle.

11. The foot operable door opener as in claim 1 wherein said gear train is selected from the group consisting of a planetary gear train or a speed increasing ratio gear train, or combinations thereof.

12. The foot operable door opener as in claim 1 wherein said appropriate durometer drive wheel is one of said appropriate durometer drive wheel or said pneumatic drive wheel, said appropriate durometer drive wheel having a soft resistance to develop friction and indentation of force, without losing said stored potential energy and manifested power, against said appropriate durometer drive wheel being in accordance with current industrial practice of the Shore A and D rubber durometer scale.

13. The foot operable door opener of claim 1 in which said gear train includes a clutch bearing allowing for one-way travel of said gear train with no backlash or backward movement.

14. The foot operable door opener of claim 1 in which said gear train has said speed increasing gear train ratio of approximately about 1 to 10.

15. The foot operable door opener as in claim 1 wherein said foot operable door opener closes with aid of existing closing mechanisms which are not part of said foot operable door opener, but are required to close said door and complete said cycle.

16. The foot operable door opener as in claim 15 wherein the existing commercially available door closing mechanisms are selected from the group consisting of standard spring-loaded door hinges, gravity door hinges, overhead closing mechanisms, and floor mounted door closing mechanisms, said existing commercially available door closing mechanisms being further selected from the group consisting of built-in or retrofit door closing mechanisms, or combinations thereof.

17. The foot operable door opener of claim 1 wherein said drive wheel assembly is connected to said crank arm with a cable loop engaging a drum or a rotating member, or combinations thereof, whereby when said foot pedal and said crank arm are depressed, said cable loop turns said drum or said rotating member, winding said at least one main spring.

18. The foot operable door opener of claim 1 in which said at least one main spring or a spring assembly are operable in a left-handed or a right-handed winding orientation, and when multiple springs are utilized on said spring assembly, both said left handed and/or said right handed winding orientation springs may be required, oriented in or on either side of said gear train.

19. The foot operable door opener of claim 1 wherein a chassis mounted on said door houses a variety of components of substantially all operative elements of said foot operable door opener.

20. The foot operable door opener as in claim 1 wherein said traction tension assembly regulates adhesive, slippage or coefficient of friction of said variety of components on surfaces upon which said variety of components move, selected from the group consisting of one or more of said bracket arm, an actuating arm, a connecting arm, a carriage depressing arm, a hinge pin and a tension arm with a tension arm roller, or combinations thereof.

21. The foot operable door opener as in claim 20 further comprising a traction tension assembly, a trigger actuator pin and a friction slip clutch disposed between said drive wheel and said drive shaft.

22. The foot operable door opener of claim 1 wherein said drive wheel assembly is connected to said crank arm with a set of loops engaging a rotating member, whereby when said foot pedal and said crank arm are depressed, said set of loops turn said rotating member, winding said at least one main spring.

23. A foot operable door opener comprising: a crank assembly comprising a crank arm rotated from a starting position before any operations by depression of a foot pedal, with a foot or cane, for rotating a crank shaft; which, in turn activates: a spring assembly connected to said crank arm through said crank shaft for powering a gear train with a preselected speed increasing ratio for transferring power from at least one main spring to a drive wheel assembly; said at least one main spring being wound by said crank assembly, said at least one spring being at least one wound spring to develop a stored potential energy and manifested power to perform the work required to open a door, said stored potential energy and manifested power being transferred to said gear train with said preselected speed increasing ratio for transferring said stored potential energy and manifested power from said at least one main spring to said drive wheel assembly; said crank assembly and crank shaft rotating said gear train with a speed increasing gear train ratio of about 1 to 10 which winds said at least one main spring and providing said stored potential energy and manifested power to said drive wheel assembly, whereby said drive wheel assembly comprises an appropriate durometer, drive wheel or a pneumatic drive wheel connected to a main drive shaft; a traction tension assembly actuated by said crank shaft, said spring, and said foot pedal for winding said at least main spring for rotating said main crank shaft for swinging said door open; a return spring mounted on said crank shaft for returning said crank shaft to said starting position; and, whereby an entrant is able to open said door without use of hands or electrical assistance.

24. The foot operable door opener as in claim 23 further comprising a delay assembly for a delayed release of said stored potential energy and manifested power of said at least one main spring to said main drive shaft in order to allow safe ergonomic transfer of the weight of an entrant to both feet, allowing said entrant to step aside to clear the path of the swinging said door.

25. The foot operable door opener of claim 24 in which said delay assembly is selected from the group consisting of a dashpot or a spring-loaded pneumatic cylinder or a pneumatic cylinder or a single acting pin cylinder, or combinations thereof, compressed by said crank shaft when said foot pedal and said crank arm are depressed, said spring loaded pneumatic cylinder having an adjustable needle valve, or a fixed orifice restrictor, for allowing air to escape from a compressed chamber in said pneumatic cylinder, regulating said delay assembly which releases said stored potential energy and manifested power from said at least one main spring and starts a cycle of said drive wheel assembly turning without losing any of said stored potential energy and manifested power.

26. The foot operable door opener as in claim 25 wherein an escaping pressure is released from said compressed chamber of said single-acting pin cylinder through said fixed orifice restrictor or other means, regulating said delay, and wherein as said pressure is released, said delay assembly releases said stored potential energy and manifested power of said at least one main spring and releases rotation of said drive wheel.

27. The foot operable door opener of claim 25 in which said spring-loaded pneumatic cylinder has a piston and is connected to at least one of a spring-loaded plunger or said dashpot, said spring-loaded plunger is engaged, activated by a pressure depressing a pawl which engages a ratcheting wheel or sprocket, which is directly connected to said drive wheel, wherein metered release of pressure within said compressed chamber of said pneumatic cylinder through said fixed orifice restrictor or adjustable needle valve causes said delay of said spring-loaded plunger to retract and to release said, ratcheting wheel or sprocket, releasing said stored potential energy and manifested power from said at least one main spring with said delay, and starts said cycle of said drive wheel turning without losing any of said stored potential energy and manifested power.

28. The foot operable door opener of claim 24 wherein said delay assembly includes a friction clutch to restrain said drive wheel for said fixed orifice restrictor or said adjustable needle valve for a variable length of time, or a dampener, to mechanically regulate said spring-loaded plunger depressing said pawl which engages said ratcheting wheel or sprocket which is directly connected to said drive wheel, whereby release of said pressure within said pneumatic cylinder causes said spring-loaded plunger to release said ratcheting wheel or sprocket, and releases said stored potential energy and manifested power from said at least one main spring within a measured delay and starts said cycle of said drive wheel turning without losing any of said stored potential energy and manifested power.

29. The foot operable door opener of claim 28 wherein said dampener is said dashpot.

30. The foot operable door opener of claim 28 in which said traction tension assembly is additionally actuated when said crank arm is depressed, rotating said drive shaft and causing a carriage depressing arm to pull down a bracket arm, engaging a spring-loaded mechanism held down by a locking pawl, causing a constant downward pressure for a predetermined length of travel, to accommodate an undercut under said door, a threshold, and/or any slope or variation in the path of travel of said foot operable door opener.

31. The foot operable door opener of claim 30 wherein an activation pin hits an activation trigger when said at least one main spring unwinds at an end of rotation of said at least one main spring, releasing said locking pawl and said spring-loaded mechanism, raising up said drive wheel back to said starting position ready for the next said cycle of said drive wheel turning again, depressing said foot pedal by the entrant without losing any of said stored potential energy and manifested power.

32. The foot operable door opener of claim 31 wherein a further delay sequence assembly is retrofitted onto said activation trigger so that said further delay from said delay assembly is provided on both ends of a door opening and said door closing said cycle.

33. The foot operable door opener as in claim 23 wherein said gear train is selected from the group consisting of a planetary gear train or said speed increasing ratio gear train, or combinations thereof.

34. The foot operable door opener as in claim 23 wherein said drive wheel assembly is one of said appropriate durometer drive wheel or said pneumatic drive wheel, said appropriate durometer drive wheel having a soft resistance to develop friction and indentation of force, without losing said stored potential energy and manifested power, against said appropriate durometer drive wheel being in accordance with current industrial practice of the Shore A and D rubber durometer scale.

35. The foot operable door opener of claim 23 in which said gear train includes a clutch bearing allowing for one-way travel of said gear train with no backlash or backward movement.

36. The foot operable door opener of claim 23 in which said gear train has said speed increasing gear train ratio of approximately about 1 to 10.

37. The foot operable door opener as in claim 23 wherein said foot operable door opener closes with aid of existing closing mechanisms which are not part of said foot operable door opener, but are required to close said door and complete said cycle.

38. The foot operable door opener as in claim 37 wherein the existing commercially available door closing mechanisms are selected from the group consisting of standard spring-loaded door hinges, gravity door hinges, overhead closing mechanisms, and floor mounted door closing mechanisms, said existing commercially available door closing mechanisms being further selected from the group consisting of built-in or retrofit door closing mechanisms, or combinations thereof.

39. The foot operable door opener of claim 23 in which said at least one main spring is operable in a left-handed or a right-handed winding orientation, and when multiple springs are utilized on said spring assembly, both said left handed and right handed winding orientation springs may be required, oriented in or on either side of said gear train.

40. The foot operable door opener of claim 23 wherein a chassis mounted on said door houses a variety of components of substantially all operative elements of said foot operable door opener.

41. The foot operable door opener as in claim 23 wherein said traction tension assembly regulates adhesive, slippage or coefficient of friction of said variety of components on surfaces upon which, said variety of components move, selected from the group consisting of one or more of said bracket arm, an actuating arm, a connecting arm, said carriage depressing arm, a hinge pin and a tension arm with a tension arm roller, or combinations thereof.

42. The foot operable door opener as in claim 41 further comprising a traction spring, a trigger actuator pin, and a friction slip clutch disposed between said drive wheel and said drive shaft.

43. The foot operable door opener as in claim 1 wherein said at least one main spring is a plurality of multiple springs, said plurality of multiple springs being said left-handed or a right-handed wound winding orientation springs to develop said stored potential energy and manifested power to perform the work required to open said door, said stored potential energy and manifested power being transferred to said gear train with said preselected speed increasing ratio for transferring said stored potential energy and manifested power from said plurality of multiple springs.

44. The foot operable door opener as in claim 23 wherein said at least one main spring is said plurality of multiple springs, said plurality of multiple springs being said left-handed or a right-handed winding orientation springs to develop said stored potential energy and manifested power, to perform the work required to open said door, said stored potential energy and manifested power being transferred to said gear train with said preselected speed increasing ratio for transferring said stored potential energy and manifested power from said plurality of multiple springs.

45. The foot operable door opener of claim 23 wherein said drive wheel assembly is connected to said crank arm with a cable loop engaging a drum or said rotating member, whereby when said foot pedal and said crank arm are depressed, said cable loop turns said drum or said rotating member, winding said at least one main spring.

46. The foot operable door opener of claim 23 wherein said drive wheel assembly is connected to said crank arm with a set of loops engaging a rotating member, whereby when said foot pedal and said crank arm are depressed, said set of loops turn said rotating member, winding said at least one main spring.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The present invention can best be understood in connection with the accompanying drawings. It is noted that the invention is not limited to the precise embodiments shown in the following drawings, in which:

(2) FIG. 1 is a top left front isometric view, shown, with the foot pedal down.

(3) FIG. 2 is a bottom right rear isometric view, with the door and floor removed, and the pedal shown in an up position.

(4) FIG. 3 is a top right front isometric view, shown with the foot pedal up and down.

(5) FIG. 4 is a bottom left, rear isometric view, shown with the door and floor removed, and the foot pedal in a up position.

(6) FIG. 4A is a detail section view of the main drive wheel, 5.1, delay system.

(7) FIG. 4B is a detail section view of the traction carriage assembly.

(8) FIG. 4C is a diagrammatic block drawing of the pneumatic delay system.

(9) FIG. 4D is a diagrammatic block drawing of the dashpot delay system.

(10) FIG. 4E is a diagrammatic block drawing of the slip clutch delay system.

(11) FIGS. 5A, 5B and 6 show details of the environment in which the foot operable door opener is utilized, wherein:

(12) FIG. 5A shows a pedestrian approaching a door having a foot operable door opener, including a foot contactable pedal attached to a crank arm, whereby a housing encloses the internal components of the foot operable door opener; and,

(13) FIG. 5B is a close-up detail view of the pedestrian's foot approaching the pedal 1.1 mounted upon crank arm, and the housing mounted on the ground “G” in the vicinity of door “D”; and,

(14) FIG. 6 is a close-up detail view of the wordless instructional logo.

(15) FIG. 7 is a top, right front isometric view of a second embodiment of the door opener, shown with the foot operable pedal in a down position.

(16) FIG. 8 is a top right front isometric view of the second embodiment of with the pedal up position.

(17) FIG. 9 is a top left front isometric view of the second embodiment of FIG. 7, shown with the pedal down, but with a delay slip clutch assembly to allow a user time to step away from an opening door.

(18) FIG. 10 is a left side isometric view of a third embodiment for a foot operable door opener, shown with the pedal in an up position.

(19) FIG. 11 is a right-side isometric view of the third embodiment for a foot operable door opener, shown with the pedal in an up position.

(20) FIG. 12 is an exploded detail view of a planetary gear associated with the third embodiment.

LIST OF REFERENCE NUMERALS

(21) FIGS. 1-6

(22) 1.0 CRANK ASSEMBLY Numeral Description 1.0 Foot Activation 1.1 Pedal 1.11 Pedal spring 1.2 Crank arm 1.3 Crank shaft 1.31 Crank pin 1.32 Bushing 1.33 Arm return spring 1.331 Retaining screw 1.4 Arm guide bracket and stop 1.41 Guide pin 2.0 DRIVE ASSEMBLY Numeral Description 2.1 Cable termination pin 2.11 “e” clip ring 2.2 Transfer cable 2.3 Cable drum 2.4 Termination/tensioning hub 2.41 Tensioner locking screw 2.5 Transfer shaft 2.6 Main springs, right-handed 2.7 Main springs, left-handed 2.8 Tension locking screw 3.0 CHASSIS Numeral Description 3.1 Main chassis 3.2 Chassis mounting holes and screws 4.0 GEAR TRAIN Numeral Description 4.1 Main gear with clutch bearing 4.11 clutch bearing 4.2 Idler increasing gear 4.21 Idler shaft 4.3 Secondary speed increasing gear 431 Shaft 4.4 Drive gear 4.5 Drive shaft 4.51 Bushing 4.52 E clip 5.0 DRIVE WHEEL ASSEMBLY Numeral Description 5.1 Drive wheel 5.11 Drive wheel bearing 5.2 Wheel hub 6.0 DELAY ASSEMBLY Numeral Description 6.1 Spring-loaded Pneumatic cylinder compressing arm 6.11 Locking pin 6.2 Pneumatic double acting cylinder with spring return 6.21 Cylinder shaft and clevis 6.22 Clevis pin 6.23 E clip 6.24 Air line 6.25 Valve assembly 6.251 Check valve 6.252 Orifice restrictor 6.3 Single acting pin cylinder 6.31 Block 6.32 Plunger 6.4 Pawl 6.41 Hinge pin 6.5 Rachet wheel 6.6 Return spring 7.0 TRACTION/TENSION CARRIAGE ASSEMBLY Numeral Description 7.1 Fork assembly 7.11 Guide 7.12 Guide pin and stop 7.13 Fork assembly lifting spring 7.2 Actuating arm 7.21 Connecting link 7.3 Carriage depressing arm 7.31 Hinge pin 7.4 Tension arm 7.41 Tension arm roller 7.5 Traction locking pawl 7.51 Traction pawl spring 7.52 Pawl actuator shaft 7.6 Traction spring 7.7 Trigger lever 7.8 Trigger actuator pin 10 Safety Max door opener 12 Unit cover 13 Instructional signage graphic D Door G Ground
FIGS. 7-9 31.0 CRANK ASSEMBLY Numeral Description 31.0 Foot activation 31.1 Pedal 31.2 Crank arm 31.3 Crank shaft 32.0 DRIVE ASSEMBLY Numeral Description 32.2 Transfer arm 32.3 Drive pawl 32.5 Transfer shaft 32.6 Main springs, right-handed 33.0 CHASSIS Numeral Description 33.1 Main chassis 33.2 Chaise mounting holes and screws 34.0 GEAR TRAIN Numeral Description 34.1 Main Gear 34.11 Clutch bearing 34.2 Idler increasing gear 34.21 Idler shaft 34.3 Secondary speed increasing gear 34.31 Shaft 34.4 Drive gear 34.5 Drive shaft 34.6 Transfer gears 35.0 DRIVE WHEEL ASSEMBLY Numeral Description 35.1 Drive wheel 36.0 DELAY ASSEMBLY 36.1 Friction plate and clutch assembly 37.0 TRACTION/TENSION CARRIAGE ASSEMBLY Numeral Description 37.1 Bracket arm 37.2 Actuating arm 37.21 Connecting arm 37.3 Carriage depressing arm 37.31 Hinge pin 37.4 Tension arm 37.41 Tension arm roller 37.6 Traction spring 37.8 Trigger actuator pin 310 Safety Max™ door opener D Door G Ground
FIGS. 10-12 51.0 CRANK ASSEMBLY Numeral Description 51.0 Foot activation 51.1 Pedal 51.2 Crank arm 51.3 Crank shaft 51.32 Bushing 51.33 Arm return spring 52.0 DRIVE ASSEMBLY (Spring-loaded) Numeral Description 52.6 Main springs, right-handed 52.7 Main springs, left-handed 53.0 CHASSIS Numeral Description 53.1 Main chaise 53.2 Chassis mounting holes and screws 54.0 GEAR TRAIN Numeral Description 54.1 Planetary gear assembly 54.11 Clutching bearing 54.5 Drive shaft 54.51 Bushing 55.0 DRIVE WHEEL ASSEMBLY Numeral Description 55.1 Drive wheel 56.0 DELAY ASSEMBLY 57.0 TRACTION/TENSION CARRIAGE ASSEMBLY Numeral Description 57.1 Bracket arm 57.11 Guide 57.12 Guide pin and stop 57.31 Hinge pin 57.5 Traction locking ratchet and hinge 57.6 Traction spring 57.7 Trigger lever 57.8 Wheel return lifting springs 510 Safety Max™ door opener D Door G Ground

DETAILED DESCRIPTION OF THE DRAWINGS

(23) The present invention has broad applications to many technical fields for a variety of articles. For illustrative purposes only, a preferred mode for carrying out the invention is described herein, wherein a foot operable door opener is provided without an electrical assist.

(24) In a first embodiment, shown in drawing FIGS. 1-6, the foot operable door opener of this invention has a pedal that is convenient for the user. Exposure to hand operable unsanitary hand operable door handles is minimized and for hands free door operation when moving through door portals when hands are occupied.

(25) The current configuration of the first embodiment of the door opener is divided into seven distinct operational segments. The first segment is the crank assembly, 1.0. The cycle is initiated when the pedal 1.1 is depressed which moves the crank arm, 1.2, down transferring the torque to the crankshaft, 1.3. The crank arm returns back to the home position with the assistance of the return spring, 1.33.

(26) The next segment is the drive assembly, 2.0. The drive assembly is connected to the crank arm with a set of steel cables, 2.2. The cables are wrapped around the drum, 2.3, when the pedal and crank arm are depressed, the cables, turn the drum, winding up the main springs, 2.6, 2.7. In the current configuration, the springs are both left-handed and right-handed, ganged up on the main shaft, 2.5, to generate the torque required to turn the wheel, 5.1 via gear train 4.0.

(27) The chassis, 3.1, houses all the different mechanisms and bushings within the chassis. It is also accommodating the means of securing the chassis with fasteners, such as screws or clamps, to the door.

(28) The gear train, 4.0. has a speed increasing ratio of 1 to 10. The 60 degree turn on the crank arm, 1.2, will translate to 4.5 revolutions of the 4-inch wheel, 5.1. This is enough to open the door 25 to 30 inches. The main springs, 2.6, 2.7, drive the primary gear, 4.1, which has a one-way clutch bearing, 4.11, centered around the shaft, 2.5. This allows for the one-way travel of the gear with no backlash or backward movement. The large main gear is meshed with the small idler gear, 4.2, which is connected with gear, 4.3 via axle 4.31. The gear 4.3 is meshed with drive gear, 4.4. The drive gear 4.4 is mounted on the same shaft, 4.5, as the drive wheel, 5.1. The drive train transmits rotation of the transfer shaft 2.5 to driveshaft 4.5 with ratio 1:10 in the same rotational direction.

(29) The drive wheel assembly, 5.0, consists of a drive wheel, such as, for example, a soft durometer wheel connected to the main driveshaft, 4.5, or a pneumatic main drive wheel, through a hub, 5.2. The energy stored in wound-up torsion springs 2.6 and 2.7 is transmitted via gear train to drive wheel 5.1. The drive wheel 5.1 is temporarily locked by delay system to allow a safe time delay, such as about 3 to 5 seconds, for the wheel 5.1 to start rotating.

(30) The delay system, 6.0, holds and delays the release of the energy of the wound springs 2.6 and 2.7. This allows safe ergonomic transfer of one's weight to both feet. This unique feature enables one's weight to be planted back on the ground. This allows the entrant to comfortably step aside to clear the swinging door.

(31) The delay assembly 6.0 consists of a double-acting pneumatic cylinder, with spring return, 6.2. The cylinder 6.2 is compressed by means of the main crankshaft, 1.3, when the pedal, 1.1 and crank arm, 1.2, are depressed. Cylinder, 6.2, through plastic tubes, 6.24 and check valves, 6.251, pressurizing the system to a single acting pin cylinder, 6.3, extending a plunger, 6.32. This plunger depresses a pawl, 6.4, which engages and locks a ratchet wheel, 6.5, which is directly connected to the main drive wheel 5.1. Air escapes from the compressed chamber of the single-acting pin cylinder, 6.2, through fixed orifice restrictor, 6.252, or needle valve, regulating the delay. As the pressure is released through the orifice, the spring-loaded plunger, 6.32, retracts releasing the pawl, 6.4, with the aid of a tension spring, 6.6, allowing the pawl 6.4, to release the ratchet, 6.5, on the main wheel, 5.1. This delay releases the stored energy of the wound-up torsion springs without losing any energy and frees rotation of the drive wheel 5.1.

(32) The traction tension assembly, 7.0, is actuated when the main pedal crank arm, 1.2, is depressed. This rotates the crankshaft, 1.3, which is connected to the actuating arm, 7.2, which pulls down the carriage depressing arm, 7.3. through the connecting link, 7.21, The depressing arm, 7.3, pulls down the tension arm, 7.4, through tension arm roller, 7.41, which falls into a notch and is locked into place with the traction locking pawl, 7.5, assisted with traction pawl spring, 7.51, which maintains continuous light torque that keeps traction locking pawl in contact with round part of the tension arm 7.4. The depressing arm, 7.3, pulls down and engages the pre-loaded fork assembly, 7.1, through guide pin and stop 7.12. moving the drive wheel, 5.1 towards the ground. The Traction spring, 7.6, keeps constant downward pressure and develops positive force to the ground to maintain traction throughout the one- and one-half inches of travel, 7.11. This is to accommodate: the undercut under a door, threshold, and any slope in the travel path of the opening door.

(33) As the main springs, 2.6, 2.7, unwinds at the end of the cycle, an actuating pin 7.8 hits the trigger lever 7.7 and lifts the locking pawl 7.5 through pawl actuator shaft 7.52, releasing the fork assembly with the assistance of the fork assembly lifting spring, 7.13. This raises up the main drive wheel, 5.1, back to the resting position where it is ready for the next cycle.

(34) FIGS. 4A, 4B, show section details of the mechanisms which are difficult to see in the isometric views. FIGS. 4C, 4D and 4E show optional systems with diagrammatic drawings.

(35) FIG. 4A is a section close-up detail view of a wheel delay assembly. For example, as noted above, the delay assembly 6.0 consists of a double-acting pneumatic cylinder, with spring return, 6.2. The cylinder 6.2 is compressed by means of the main crankshaft, 1.3, when the pedal, 1.1 and crank arm, 1.2, are depressed. Cylinder, 6.2, through plastic tubes, 6.24 and check valves, 6.251, pressurizing the system to a single acting pin cylinder, 6.3, extending a plunger, 6.32. This plunger depresses a pawl, 6.4, which engages and locks a ratchet wheel, 6.5, which is directly connected to the main drive wheel 5.1. Air escapes from the compressed chamber of the single-acting pin cylinder, 6.2, through fixed orifice restrictor, 6.252, or needle valve, regulating the delay. As the pressure is released through the orifice, the spring-loaded plunger, 6.32, retracts releasing the pawl, 6.4, with the aid of a tension spring, 6.6, allowing the pawl 6.4, to release the ratchet, 6.5, on the main wheel, 5.1. This delay releases the stored energy of the wound-up torsion springs without losing any energy and frees rotation of the drive wheel 5.1.

(36) FIG. 4B is a section close-up detail view of traction/tension carriage assembly. For example, as noted above, the traction tension assembly, 7.0, is actuated when the main pedal crank arm, 1.2, is depressed. This rotates the crankshaft, 1.3, which is connected to the actuating arm, 7.2, which pulls down the carriage depressing arm, 7.3. through the connecting link, 7.21, The depressing arm, 7.3, pulls down the tension arm, 7.4, through tension arm roller, 7.41, which falls into a notch and is locked into place with the traction locking pawl, 7.5, assisted with traction pawl spring, 7.51, which maintains continuous light torque that keeps traction locking pawl in contact with round part of the tension arm 7.4. The depressing arm, 7.3, pulls down and engages the pre-loaded fork assembly, 7.1, through guide pin and stop 7.12. moving the drive wheel, 5.1 towards the ground. The Traction spring, 7.6, keeps constant downward pressure and develops positive force to the ground to maintain traction throughout the one- and one-half inches of travel, 7.11. This is to accommodate: the undercut under a door, threshold, and any slope in the travel path of the opening door.

(37) As the main springs, 2.6, 2.7, unwinds at the end of the cycle, an actuating pin 7.8 hits the trigger lever 7.7 and lifts the locking pawl 7.5 through pawl actuator shaft 7.52, releasing the fork assembly with the assistance of the fork assembly lifting spring, 7.13. This raises up the main drive wheel, 5.1, back to the resting position where it is ready for the next cycle.

(38) FIG. 4C is a diagrammatic drawing of the optional pneumatic delay system. When the double acting cylinder is activated by the crank shaft 1.3, to pressurizes the system, with the aid of the check valves. The valves allow the pressure to build up in single acting pin cylinder, engaging the plunger. The second check valve in line from the primary cylinder maintains the seal and pressure at the pin cylinder. The orifice restrictor or needle valve relieves the pressure at a controlled rate which delays the release of the drive wheel. The first check valve in line relieves the pressure in the primary cylinder, so it has an unimpeded backstroke, so it is ready to charge the system with the next depression of the pedal.

(39) This could also serve as a delay for the engagement of the traction release mechanism, 7.0, providing another delay option for holding the door open delaying the closing cycle with a fixed or variable time interval.

(40) FIG. 4D is a diagrammatic drawing of an optional dashpot delay system. This mechanism can be used in conjunction with the pneumatic system in 4C or as a standalone system which is physically activated by mechanical means. The spring-loaded dashpot cylinder in conjunction with the restrictor or needle valve allows for the controlled release of the plunger equating into the time delay for the start of the drive wheel engagement.

(41) This could also serve as a delay for the engagement of the traction release mechanism, 7.0, providing another delay option for holding the door open delaying the closing cycle with a fixed or variable time interval.

(42) FIG. 4E is a diagrammatic drawing of an optional friction slip clutch delay system. A stationary fixed to the axle disc, engages a rotating disc, which is attached to the drive wheel. The two discs are allowed to slip a prescribed number of degrees until they mechanically engage and lock into each other. The time delay is adjusted by varying the tension applied to the load spring with a tensioning nut. This varies the duration of the slippage until the two surfaces mechanically engage.

(43) This could also serve as a delay for the engagement of the traction release mechanism, providing another delay option for when the closing cycle would begin.

(44) FIGS. 5A, 5B and 6 show details of the environment in which the foot operable door opener is utilized.

(45) For example, FIG. 5A shows a pedestrian approaching a door “D” having a foot operable door opener 10, including s foot contactable pedal 1.1 attached to a crank arm 1.2, whereby a housing 12 encloses the internal components of the foot operable door opener 10. FIG. 5A also shows a wordless instructional logo 13 displayed upon the surface of the door or any suitable visually perceptible surface in the vicinity of the door. The logo preferably has a triptych of three images, including the diagonal “NO” sign through a picture of a user's hand holding a door handle, a close-up detail view of the pedestrian's foot contacting the pedal 1.1, and an image of the door shown being opened in the direction of the curved arrow depicted, noting caution to be exercised in the path of the swinging door.

(46) FIG. 5B is a close-up detail view of the pedestrian's foot approaching the pedal 1.1 mounted upon crank arm 1.2, and the housing 12 mounted on the ground “G” in the vicinity of door “D”.

(47) FIG. 6, is a close-up detail view of the wordless instructional logo 13.

(48) In the foregoing description, certain terms and visual depictions are used to illustrate the preferred embodiment. However, no unnecessary limitations are to be construed by the terms used or illustrations depicted, beyond what is shown in the prior art, since the terms and illustrations are exemplary only, and are not meant to limit the scope of the present invention.

(49) In a second embodiment, as shown in FIGS. 7-9 the current configuration of the door opener is divided into seven distinct operations. The first operation is the crank assembly, 31.0. The cycle is initiated when the pedal, 31.1 is depressed which moves the crank arm, 31.2, down transferring the force to the crankshaft, 31.3. The crank arm returns back to the home position over the course of the opening cycle, with the assistance of the main spring, 32.6, through the trigger actuator pin, 37.8. The crank arm, 31.2, is connected to the driver arm, 32.7, through the connecting link, 32.2.

(50) The next operation is the drive assembly, 32.0. The drive assembly is connected to the main spring, 32.6, when the pedal and crank arm are depressed, the main spring winds up and turns the main gear, 34.1, through the transfer shaft, 32.5, which has a clutch bearing, 34.11, centered around the shaft, 32.5. This allows for the one-way travel of the gear with no backlash or backward movement. The main gear is held in place and not allowed to unwind the main spring by the drive pawl, 32.3, which is depressed and set by the connecting link, 32.2. Winding the main spring, 32.6,

(51) The chassis, 33.1, houses all the different mechanisms and bushings within the chassis. It is also accommodating the means of securing the mechanize with screws or clamps to the door.

(52) The gear train, 34.0. has a speed increasing ratio of 1 to 10. This is so a 60-90 degree turn on the crank arm, 31.2, will net 2½ to 3 full revolutions of the 04-inch wheel, 35.1. This is enough to open the door 25 to 30 inches. The main Spring, 32.6, drive the main gear, 34.1, and meshes with the transfer gears, 34.6. The large transfer gears steps down to the small idler gear, 34.2, which again steps up to the secondary speed increasing gear, 34.3, and eventually to the drive gear, 34.4. The drive gear is mounted on the same shaft, 34.5, as the drive wheel, 35.1.

(53) The drive wheel assembly, 35.0, consists of a soft durometer wheel connected to the main driveshaft, 34.5, connected to the drive shaft. The potential energy of the springs, 32.6, are wound with the depression of the pedal, 31.1 and the crank arm, 31.2, connected to the driver arm, 32.7 through the connecting link, 32.2, which winds the spring, 32.6. The potential energy is held back, momentarily, not allowed to release.

(54) The delay assembly, 36.0, holds and delays the release of the potential energy of the wound springs. This allows safe ergonomic transfer of one's weight to both feet. This unique feature enables one's weight to be planted back on the ground. This allows the entrant to comfortably step aside to clear the swinging door.

(55) The delay assembly consists of spring-loaded pneumatic cylinder, (not shown). The cylinder is compressed by means of the main crankshaft, when the pedal and crank arm, is depressed. Cylinder, with the aid of hoses, and check valves, moves air to the piston of a single action pin cylinder, and plunger. This plunger depresses a pawl, which engages a ratcheting wheel, which is directly connected to the main drive wheel. Air escapes from the compressed chamber, adjusted with a needle valve, regulating the delay. As the pressure is released, the plunger, disengages with the aid of a tension spring, allowing the pawl, to release the ratchet, on the main wheel.

(56) Alternately the method includes the use of a spring-loaded dash pot with plunger to be used in lieu of the single acting pin cylinder. This would be mechanically activated. This would eliminate the need for the pneumatic cylinder, hoses, and check valves. This delay releases the stored potential from the main springs and starts the cycle of the wheel turning without losing any potential energy.

(57) Alternately the method includes a friction clutch plate, 36.1, to restrain said drive wheel, 35.1, or main gear, 34.1, for a fixed or variable length of time, as shown in FIG. 4E.

(58) The traction tension assembly, 37.0, regulates adhesive, slippage or coefficient of friction of the various components on surfaces upon which they move. It is actuated when the main pedal crank arm, 31.2, is depressed. This rotates and drops the connecting arm, 37.21, which in turn drops the carriage depressing arm, 37.3. The depressing arm actuates bracket arm, 37.1 by engaging the actuating arm, 37.2, it engages the traction spring, 37.6. This keeps constant variable pressure on the bracket arm, 37.1, so there is constant pressure on the sloping floor.

(59) As the drive pawl, 32.3, rotates along with the main gear, 34.1, the peddle, 31.1, transfer arm, 32.2, and connecting arm, 37.21, all lift the carriage depressing arm, 37.3. This in turn causes the depressing arm to lift the bracket arm, 37.1 by engaging the actuating arm, 37.2, which in turn engages the traction spring, 37.6, lifting the bracket arm, 37.1, and retracting the wheel, 35.1, so door, D, can now swing freely, back to the closed position with aid of the overhead of floor mounted, or spring-loaded hinges. This allows the door to close without human assistance.

(60) In a third embodiment shown in FIGS. 10-12, a non-motorized foot operable door opener is initiated in an entrance cycle by the user stepping on a pedal, 51.1. This force exerted on the pedal 51.1, drives the crank arm, 51.2, a sixty to ninety (60-90) degree turn, engaging a soft wheel, 55.1, to open the door D. The pedal, 51.1, is hard linked to a crank arm, 51.2, which goes into a unidirectional clutch bearing, 54.11, connected to a planetary gear box, 54.1, connected to drive shaft hub, 54.5, to turn the soft wheel, 55.1. The downward pressure from the pedal, 51.1, pivots the bracket arm, 57.1, at a traction locking ratchet, 57.5, and hinge, 57.31, connected to the main chassis, 53.1, is a spring-loaded wheel assembly, 57.6, to keep constant pressure to the ground, G.

(61) A speed increasing planetary gear box, 54.1, winds one or more springs, 52.27 and 52.26, (right and left-handed) which may work optionally if the sequence is reversed and goes from crank arm to gears, to winding springs, or also optionally multiple pumps of the pedal, turns the wheel system, which each are connected to drive shaft, 54.5, in turn rotating the wheel, 51.1, over multiple 360 degrees rotations, and thereby opening the door, D, sufficiently to allow the entrant to pass until the foot pedal, 51.1, is dis-engaged by the entrant. The crank arm, 51.2, is returned to its original position, with the aid of the return arm spring, 51.33. This action causes the crank arm, 51.2, to strike the trigger lever release, 57.7, which in turn releases the ratcheting hinge mechanism and spring, 57.5, and 57.6, allowing the wheel return lifting springs, 57.8, to lift the wheel assembly to rotate up, back to its original up position, guided by the guide pin and stop, 57.11, and 57.12, releasing the wheel, 55.1, from the ground, thus allowing the door to close with a standard overhead closer or spring-loaded hinge, which is standard hardware on most doors. At that time after the opening and closing of the door, the door is ready for the next entrant.

(62) The embodiment of FIGS. 10-12 may include an optional, main spring, or springs, 52.27, and 52.26, both right and left-handed, which can be wound for a further assist to accommodate a delayed action, 56.0, where, at that point, a foot switch actuated spring-loaded wheel drops and engages an opening cycle as described above. The door which, after actuation, will close after a time delay, 56.0, on the retracting spring mechanism, also described above. Both opening and closing are by mechanical advantage, without the use of electric power or motors.

(63) In general, in all three embodiments of FIGS. 1-6, 7-9 and 10-12, the present invention is differentiated, unique, novel, and distinguishable from any motorized prior art door openers, by its' being a simple machine without electric power, electric motors, scanner or traffic readers of any kind, and through mechanical advantage and a ratchet, spring loaded hinge assembly, to keep constant pressure to the floor plane, hygienically opening doors when safety from disease, virus, bacteria, or other hazards which are wished to be avoided and hands free operation when ones hands are occupied such as food service and warehouse personnel, by the use of an economical apparatus that can be added/or retro fit to any door type, through brackets or the chassis mounting holes, or clamping plate, to secure to wood, hollow metal, metal framed glass, all glass, etc. doors, to facilitate ingress and egress passages of all types, locations, and environments.

(64) In general, in all three embodiments of FIGS. 1-6, 7-9 and 10-12, the present invention is differentiated, unique, novel, and distinguishable from any non-motorized prior art door openers, by its' being a simple machine that can develop the mechanical advantage necessary to open exterior and other doors safely, hands free with integrated delay, to afford using an ergonomically user friendly and safe interface when paired with doors which have standard resistance due to the presence of overhead, floor closers, and spring hinges.

(65) It is further noted that while FIGS. 4A, 4B, 4C, 5A, 5B and 6 are shown in conjunction with the preferred embodiment of FIGS. 1-4, it is known that FIGS. 4A, 4B, 4C, 5A, 5B and 6 can also be used with the alternate embodiments of FIGS. 7-9 and 10-12.

(66) A second embodiment shown in drawing FIGS. 7, 8 and 9 describes a non-preferred embodiment with a friction slip clutch delay assembly and where the gear train includes a main gear, an idler increasing gear and a secondary gear.

(67) A third embodiment shown in drawing FIGS. 10, 11 and 12 describes another non-preferred embodiment, optionally without a delay assembly, and where the gear train is a planetary gear assembly.

(68) It is further known that other modifications may be made to the present invention, without departing the scope of the invention, as noted in the appended Claims.