Abstract
A flex clipper provides a feature to help the cutting blade set float more effortlessly by adjusting automatically to the contours of a client's head to prevent getting stuck and causing cuts and irritation to the scalp. The hair clipper preferably also uses a self-contained motor-driven pivotable adjustment mechanism to adjust the relative position of the stationary and reciprocating blades of a common type of blade set. One or more on/off switches operable by the thumb of the hand holding the clipper to afford a barber total automatic adjustment with the clipper itself in an on or off condition.
Claims
1. A flex hair clipper comprising: a manually graspable external handle body housing an internal housing having a motor with an eccentric cam; a driver in operative engagement with the eccentric cam; a blade set including a movable blade and a stationary blade, the movable blade being in operative engagement with the driver so that the movable blade moves back and forth against the stationary blade via operation of the eccentric cam of the motor; a pivot plate pivotally connecting the blade set to the handle body so that the blade set pivots along an arcuate path between an inward first position to an outward second position; and a semi-rigid flexor having a semi-rigid flexible curved distal end and a linear body portion defining a proximal end of the flexor, the semi-rigid flexible curved distal end is attached to a back side of the blade set, the linear proximal body portion is attached to a backside of the handle body, the flexor counteracts a propensity of the blade set to move to the outward second position so that the blade set is held in a middle position between the first position and the second position so that the blade set can pivot inward toward the first position or outward toward the second position in response to engaging contours of a user during use.
2. The flex hair clipper as in claim 1, the flexor includes a series of joined, parallel rippled peaks and valleys extending from the distal end of flexor to the proximal end of the flexor.
3. The flex hair clipper as in claim 1, further comprising the motor being powered by a power source being selected from a group consisting of a battery or an AC driven corded power source.
4. The flex hair clipper as in claim 1, further comprising a spring being provided to hold the movable blade and the stationary blade adjacent and parallel to each other, the spring being located adjacent to the driver, a driver bracket attached to the movable blade, and the driver is pivotally connected to the driver bracket via a driver pin to define the operative engagement between the movable blade and the driver.
5. The flex hair clipper as in claim 1, the handle body includes a stationary pivot mount, the pivot plate is pivotally connected to the stationary pivot mount via a pin to define the pivotal connection between the blade set and the handle body.
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 drawings, in which:
(2) FIG. 1 is a perspective view of a typical prior art hair clipper with manual adjustment lever at the side.
(3) FIG. 2 is a side elevation of the prior art hair clippers of FIG. 1.
(4) FIG. 3 is a side elevation of a motor-driven mechanism for adjusting the stationary blade of a clipper blade set showing a rack and worm gear pinion of the first embodiment.
(5) FIG. 4 is a perspective view of the hair clipper of this invention incorporating the mechanism of FIG. 3.
(6) FIG. 4A is a side view in crossection of the hair clipper of this invention, showing the primary motor therein.
(7) FIG. 5 is a wiring diagram of the adjustment motor using an H-bridge type of reversible driver.
(8) FIG. 6 is a top view of a second embodiment hair clipper with motor-driven adjustment of this invention.
(9) FIG. 7 is a side elevation of the second embodiment clipper with the housing cover removed to reveal the timing belt bushing and gear train mechanism.
(10) FIG. 8 is a side exploded elevation of the flex clipper embodiment of this invention.
(11) FIG. 9 is an assembled perspective view of the flex clipper of FIG. 8.
(12) FIG. 10 is a side elevation of a compliant coupling between blade set module and main housing based on the use of an elastomeric foam ring.
(13) FIG. 11 is a perspective view of an elastomeric foam ring.
(14) FIG. 12 is a perspective view of the cutting length adjuster mechanism as attached to the adjustable comb plate.
(15) FIG. 13 is a high-level schematic diagram of the electrical elements of the flex clipper of this invention.
(16) FIG. 14 is a perspective view of an alternate embodiment for a hair clipper with a flexing pivoting blade set.
(17) FIG. 15 is a side view thereof.
(18) FIG. 16 is a front view thereof.
(19) FIG. 17 is an exploded view of the motor, eccentric cam, driver, pivot set, and blade set thereof.
(20) FIG. 18 is a close-up perspective view of the flexing bushing belt flexor associated with the pivoting blade set.
(21) FIGS. 19A, 19B, 19C, 19D are top, perspective, side and end views of the driver bracket.
(22) FIGS. 20A, 20B, 20C, 20D are top, perspective, side and end views of the pivot plate.
(23) FIGS. 21A, 21B, 21C, 21D are top, perspective, side and end views of the pivot mount.
(24) FIGS. 22A, 22B, 22C, 22D are top, perspective, side and end views of the driver.
(25) FIGS. 23A, 23B, 23C, 23D are top, perspective, side and end views of the inner cover/shroud.
DETAILED DESCRIPTION OF THE INVENTION
(26) FIGS. 1 and 2 show two views of a conventional cordless electric hair clipper 1 with on/off switch 3, conventional blade set 2, and side manual incremental adjusting handle 4. The detents 5 engage handle 4 to set the minimum hair cutting length at one of the selections.
(27) FIG. 3 shows the mechanism which uses gear motor 10 driving worm gear pinion 11 to perform an adjustment of stationary blade 14 relative to reciprocating blade 13 in blade set 12. A gear rack 15 subassembly is attached to blade 14 and engages pinion 11. Also shown in this view are limit switches 16 and 17 at the longest and shortest settings respectively. FIGS. 4 and 4A show clipper housing 20 with the adjustment feature. Conventional on/off switch 25 connected to clipper motor 24 (shown schematically as an encircled M) is at one side while momentary (or tap) switches 21 and 22 on the top surface are used to energize gearmotor 10 in a direction toward longer settings or shorter settings respectively. Gearmotor 10 is enclosed in descending housing 26, which descends below clipper housing 20. While FIGS. 3, 4 and 4A show a worm gear, it is anticipated that other gears may be used, such as rack and pinion gears or other gears known to those skilled in the art.
(28) FIG. 5 is a wiring diagram for the first embodiment of FIGS. 3 and 4 wherein gearmotor 10 is a simple brush type permanent magnet type driven by a common H-bridge drive module 35. Battery 30 is used primarily to power clipper motor 24 through on/off switch 25. It is also used as the power source for the adjustment feature. Drive module 35 has two direction inputs for clockwise and counterclockwise operation, an ON input, and power input and motor output connections as shown. In operation, if normally open switch 22 is pushed, a signal will flow through normally closed limit switch 17 energizing the ON input through isolation diode 36; motor 10 will be driven clockwise until either switch 22 is released or limit switch 17 is opened at the end of the excursion. Similarly, if switch 21 is pushed, counterclockwise operation is achieved through limit switch 16 and isolation diode 37. Once a limit switch is opened, motor 10 can only be driven in the opposite direction until the open limit switch is again closed.
(29) FIGS. 6 and 7 show top and side views of the second embodiment of motor-driven minimum hair length adjustable hair clippers. The same circuit shown in FIG. 5 is completely applicable to this embodiment as well. The same momentary (tap) switches 21 and 22 are used to control motor 10 which is now placed at the back end of hair clipper 40. Except for the addition of switches 21 and 22, the housing 41 and internal mechanism is identical to that of the prior art cordless clipper shown in FIGS. 1 and 2. In this embodiment, a conventional blade set 12 and internal blade adjusting mechanism is used. The feature of this embodiment couples through the shaft formerly engaged with a manual handle 4. This is shown at the center of output gear 51. In the top view of FIG. 6, housing cover 42 is a plastic shell used to enclose the feature mechanism. In FIG. 7, this cover 42 is removed to reveal the mechanism; the position is shown in dashed lines. On the top edge of cover 42 is a tri-colored strip 43 with green region 45 denoting the long settings, yellow region 46 denoting medium length settings, and red region 47 denoting short settings. This scale is meant to be read relative to the position of pointer assembly 44 which is attached to timing belt bushing 55 transmitting power and torque from pulley 57 mounted on motor 10 to pulley 56 attached to the input gear of gear train 50.
(30) Gear train 50 is used to adjust the torque at output gear 51 and to match the speed and torque of gear motor 10 and the desired indicating excursion of belt bushing 55 so as to form an ergonomic range. Besides the pointer on top, pointer assembly 44 also carries a small powerful magnet to operate limit switches 16 and 17 which are now implemented as normally closed magnetic reed switches. On/off switch 25 fits between timing belt bushing 55 and pokes through a side switch hole in housing cover 42. While FIGS. 6 and 7 show a particular embodiment for an exterior mounted embodiment, it is anticipated that other exterior mounted embodiments may be used, such as those known to those skilled in the art.
(31) While this third embodiment will be described as for a flex hair clipper with both powered hair cutting length adjustment as well as flexing compliance introduced between the main housing and blade set module, it should be noted that the flexing compliance feature to permit the blade set to automatically adjust to scalp contours and irregularities can be afforded to hair clippers without the powered hair cutting length adjustment. If the latter feature is not implemented, the blade set module will just contain the blade set and crank mechanism with coupling to the drive motor in the main housing which operates the reciprocating cutting blade; there would not be a cutting length adjustor motor, adjuster mechanism attached to the comb plate, nor a housing for the adjuster motor.
(32) FIG. 8 shows an exploded view of the major components of this embodiment. Flex clipper 100 has main housing 110 which contains drive motor 116 with shaft 112 which drives the reciprocating cutter blade 113, rechargeable battery 135 (unless it is an AC driven corded model), and an electronic driver module 160 for the hair cutting length adjuster motor 145 located in blade set module 140 at the left of the FIG. 8. Rigid coupling ring 118 is attached at the coupling end of housing 110. Blade set module 140 carries adjustable comb plate 114, reciprocating cutter blade 113, internal crank mechanism 143 for reciprocating cutter blade 113, drive shaft 142 for crank mechanism 143, housing 144 for internal hair length adjustment motor 145, internal hair length adjustment direct comb plate mechanism 114 (shown in FIG. 12), and a rigid coupling ring 146.
(33) Also shown in FIG. 8 is molded compliant bellows 120 with integral mounting rings 126 and 128 is shown between blade module 140 and main housing 110, which it couples together. Metal bellows 130 couples drive motor 116 in main housing 110 and crank drive shaft 142 in blade module 140. Cable 148 powers and controls motor 145 for hair cutting length adjustment from electronic step driver module 160 contained in housing 144; it is passed through the hollow interior of bellows 120.
(34) FIG. 9 shows an assembled flex clipper 100 showing tap switches 21 and 22 for adjusting cutting length and clipper operating switch 25. A thumb operable reverse direction wheel 23 can also be optionally used. Bellows 120 is shown coupling blade module 140 to housing 110 in a flexing compliant fashion. The length of bellows 120 as shown in FIGS. 8 and 9 may be shorter than shown based on the design and materials of the bellows. Bellows integral collars 126 and 120 fit over fixed collars 146 and 118 on blade module 140 and housing 110 respectively. Fasteners, such as self tapping screws, are used to secure the bellows collars to collars 146 and 118 which preferably have transverse holes in registration.
(35) FIG. 10 shows an alternate embodiment of an assembly 150 of resilient foam ring 152 with attached metal collars 154, which are adhesively attached or vulcanized as appropriate to the collar material. The assembly 150 of FIG. 10 can be used in lieu of custom molded bellows 120. Depending on many variables known to those skilled in the hair clippers technology, such as desirable product life, product price point, manufacturing cost, performance, volume, and materials used, either the bellows or the foam ring assembly 150 may be the better choice.
(36) FIG. 11 shows a perspective view of the foam ring prior to attachment of coupling rings 154.
(37) Although other types of flexing compliant motor couplings can be used, such as a variety of spring type couplings, the preferred coupling between shaft 112 and shaft 142 for reciprocating blade drive is a metal bellows coupling 130 such as those supplied by Servometer of Cedar Grove, NJ. This type of coupling easily fits inside the hollow bellows 120 or foam ring 152 central hole while not interfering with the degrees of freedom of the bellows or foam ring.
(38) FIG. 12 shows the simple direct comb plate 114 adjustment mechanism which includes preferably stepper motor 145, and a fastening mechanism, such as, for example, threaded bracket 149 and fine lead screw 147. Although other methods can be incorporated, a stepper motor 145 is preferred to a DC gearmotor due to size and complexity. At about 6 mm diameter and 9.5 mm long, a FDM0620 stepper motor from Micromo of Clearwater, FL is very compact and is driven with 20 steps per revolution to drive lead screw 147.
(39) FIG. 13 shows a schematic diagram for the flex clipper. It is noted that no limit switches are required because step motors can just lose steps with no damage when a hard stop is encountered. Tap switches 22 and 24 determine the direction of rotation of stepper motor 145 by supplying the proper sequence of steps from step driver module 160 over cable 148. Reciprocating blade motor 116 for reciprocating cutter blade 113 is directly powered through switch 25. Battery 135 (or equivalent DC power supply for corded versions) supplies power to both reciprocating blade motor 116, and to stepper motor 145, through step driver module 160.
(40) FIGS. 14-23D show a further flexing hair clipper 200 with an external handle body housing 200a having an interior handset housing 208 therein. In this further alternate embodiment, the blade set 206, 207 is also capable of flexing around the contours of the customer's hair, scalp and skull. As shown in FIG. 17, power is applied to the blade set 206, 207 by a conventional motor M (as in FIG. 17) within the interior handset housing 208 of the hair clippers 200. The motor M may be activated by conventional tap switches, rotating wheel switches, or other manually activated switches S. Instead of a flexible cylindrical neck, as in the aforementioned flexing embodiment of FIGS. 8-13, in this embodiment, in FIGS. 14-23D, the blade set 206, 207 is pivotable upward, as shown in FIG. 18, from a first lower position FPos, through a mid-point MPt, to a second raised position SPos, whereby, as also shown in FIG. 18, the blade set 206, 207 is optionally controlled by a semi-rigid flexible belt bushing piece 215, i.e. known as a flexor 215 which is positioned on the bottom surface of the external handle body housing 200a of clippers 200. The flexor 215 includes from top to bottom a series of joined, parallel rippled wave-like rounded peaks 215c and valleys 215d. The flexor 215 includes a semi-rigid flexible curved distal end 215a, attached to a linear proximal body portion 215b. The semi-rigid flexible curved distal end 215a biases against a portion of the blade set 206, 207 to urge the blade set 206, 207 to move around the contours of the customer's hair, scalp and skull during the process of a hair cutting. The flexor 215 counteracts the propensity of the upwardly pivoted blade set 206, 207 to pivot outwardly and holds the blade set 206, 207 in a mid-point position so that the blade set 206, 207 can push in or push out while moving over the three-dimensional curvature of the hair, scalp and skull of the customer. The semi-rigid flexible curved distal end 215a of the flexor 215 gently pushes the pivoted blade set 206, 207 to a flexing motion or a relaxed motion against the hair, scalp and skull of the customer. The linear extending proximal body portion of the flexor 215 stabilizes the flexor 215 against the body of external handle body 200a of the hair clipper 200.
(41) Although dimensions of the component parts of the hair clipper 200 may vary, FIGS. 19A, 19B, 19C, 19D, 20A, 20B, 20C, 20D, 21A, 21B, 21C, 21D, 22A, 22B, 22C, 22D, 23A, 23B, 23C and 23D each show preferred dimensions expressed in inches, or portions of inches, where the dimension areas indicate the decimal portions of an inch, including radii indicated with a capital R preceding each of the radii.
(42) The moving blade 206 of the blade set 206, 207 moves horizontally against the stationery blade 207 of the blade set 206, 207 during the cutting of the hair. As shown in FIG. 15, a spring SP is provided to hold the movable blade 206 and the stationery blade 207 closely adjacent and parallel to each other. The spring SP is located under a driver 204 which has a driver bracket 201 attached to the blade set 206, 207. The driver 204 is connected to the driver bracket 201, which pivots about driver pin 210 by the force of driver 204. The driver 204 moves the movable blade 206 against the stationery blade 207 to facilitate cutting of the hair on the scalp and skull of the customer. The movable blade 206 is moved closely adjacent and parallel to the stationery blade 207, by an eccentric rotating cam 211 which is powered by the motor M (such as for example the motor M in the other embodiment shown in drawing FIG. 8) inside the interior handset housing 208 of the hair clippers 200. Motor M is powered by a power source being one of a battery B within the interior handset housing 208 or an AC driven corded power source AC, (or equivalent DC power supply for corded versions) which supplies power to both reciprocating blade motor M, or, as also shown in FIG. 8, to a stepper motor 145, through a step driver module 160.
(43) The eccentric cam 211 causes the driver 204 to move the movable blade 206 of the blade set 206, 207 adjacent to the stationery blade 207 in subsequent left and right sets of multiple parallel movements, during cutting of the hair of the scalp and skull of the customer. The rod 211a of the rotating eccentric cam 211 is positioned between the open U-shaped driver 204 and causes the movement of the movable blade 206 against the adjacent surface of the stationery blade 207.
(44) The U-shaped driver 204 is mounted to a driver bracket 201 which is attached to the blade set 206, 207, and urges the blade set 206, 207 forward or back in an infinitely variable range of motion, limited by the pushing or release of the bushing belt flexor 215 against the pivoted blade set 206, 207. A pivot mount 202 is attached to a pivot plate 205 which pivots the blade set 206, 207 and pivots about a pin 209, which connects the movable pivot plate 205 and blade set 206, 207 to the stationery pivot mount 202, which is mounted to a base. The interior handset housing 208, supports motor M within, and the interior handset housing 208, is preferably connected to external handle body housing 200a, as shown in FIG. 18, which covers the two sides and front of the pivoting mechanisms of the hair clipper 200 in front of the pivotable blade set 206, 207, including U-shaped driver 204 communicating with rod 211a of the rotating eccentric cam 211. Hair clipper 200 also optionally includes flexing bushing belt flexor 215 on the bottom fourth side of the external handle body housing 200a of the hair clipper 200.
(45) 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.
(46) 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.
