PROPULSION SYSTEM FOR USE BY A SWIMMER

Abstract

A propulsion system, for use by a swimmer in both on-water and underwater applications, includes at least one power supply unit attachable about a sleeve secured about a forearm of the swimmer, at least one corresponding propulsion unit including a motor and an impeller, the motor in electrical communication with the motor controller, the propulsion unit within a housing, the unit extending in a direction laterally offset from the forearm, near to the wrist and away from the head of the swimmer; and control apparatus for the power and propulsion units. The control apparatus includes elements for controlling pitch of an axis of the propulsion unit relative to a forearm of the swimmer, the control elements including a pivotally secured bracket, and elements for control of the level of power provided to the propulsion unit, in which each of the rotating and control apparatus are positioned for ease of accessibility by a hand of the swimmer.

Claims

1. A propulsion system for use by a swimmer in both on-water or under-water applications, the system comprising: (a) at least one power supply unit attachable about a sleeve secured about a forearm of the swimmer; (b) at least one corresponding propulsion unit including a motor and an impeller, the motor in electrical communication with the power unit, said propulsion unit within a housing, said propulsion unit having a bracket pivotally securing it to said sleeve, said unit extending in a direction laterally offset from said forearm and distally away from the head of the swimmer; (c) control means for said power and propulsion units, said control means including: (i) means for controlling pitch of an axis of said propulsion unit relative to a forearm of the swimmer, said means including said pivotally secured bracket; and (ii) means for control of power provided by said power unit to said propulsion unit, each of said power control and pitch controlling means positioned for ease of accessibility by a hand of the swimmer.

2. The system as recited in claim 1, in which a housing of said propulsion unit defines a thruster having therewithin said impeller, from which a hydrodynamic thrust results.

3. The system as recited in claim 2, in which said control means comprises: thumb and finger accessible controls of said axis-pitch and said power control means, each of said means surrounded by a waterproof housing, said controls axially offset from said sleeve in a direction of a hand of the swimmer.

4. The system as recited in claim 3, in which said power control means includes a Hall-effect voltage controller.

5. The system as recited in claim 2, in which said sleeve comprises an extension of an arm covering of the swimmer.

6. The system as recited in claim 4, in which said power control means comprises a circuit including a motor power controller, itself controlled by a PWM circuit controlled by said Hall-effect voltage controller.

7. The system as recited in claim 3, in which said control means exhibit axial resilience at a proximal end thereof.

8. The system as recited in claim 3, in which a housing about said bracket further comprises a substantially rigid radial member pivotally securing said propulsion unit to said forearm proximally to a wrist of the swimmer.

9. The system as recited in claim 3, said propeller connected to said motor by a driveshaft, said shroud-like cover of said impeller defining a nozzle.

10. The system as recited in claim 3, in which said pitch control means comprises: means for tilting of the propulsion unit about the forearm of the swimmer.

11. The system as recited in claim 9, in which said system defines a specific gravity of between about 1.0 and about 1.25.

12. The system as recited in claim 2, in which said pitch control means of said propulsion unit includes an elongate control handle operable by extension and flexion of a wrist of the swimmer.

13. The system as recited in claim 1, in which one of which said at least one power supply unit, motor, propulsion unit and controls thereof further include a system comprising a second of said elements proportioned to the forearm of the swimmer, wherein each of said controls upon a second forearm may be controlled independently of those upon the first forearm of the swimmer.

14. The system as recited in claim 1, in which said motor comprises a DC brushless motor.

15. The system as recited in claim 6, in which a PWM signal of said control means comprises a frequency of about 50 Hertz, modulated pulses having a width of between about 1 and about 2 milliseconds, and a repetition of said pulses about 20 milliseconds each.

16. The system as recited in claim 6, in which an output of voltage of said power unit falls within a range of about zero and about 30 volts DC.

17. The system as recited in claim 6, in which each power supply unit includes one or more DC batteries in electrical communication with said motor power controller.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG. 1 is a top perspective view showing a swimmer equipped with the inventive propulsion system

[0015] FIG. 2 is a perspective view of the present invention.

[0016] FIG. 3 is a view, generally similar to that of FIG. 2, however showing the location and manual control handle behind the hand of the user at such time when the use of the controls is not required by the swimmer.

[0017] FIG. 4 is a top plan view showing the material components of the propulsion system, with certain integral elements thereof shown in phantom, and showing the Hall-effect switch proximally to a thumb of a hand of a swimmer and the control handle of the system engaged by the other fingers of the swimmer.

[0018] FIG. 5 is a front schematic view taken along Line 5-5 of FIG. 4.

[0019] FIG. 6 is a side schematic view along Line 6-6 shown in FIG. 3.

[0020] FIG. 7 is a conceptual view showing, in phantom, the rotation of the propulsion unit which is attached to the forearm of the swimmer using the mechanism for control of the pitch of the longitudinal axis of the propulsion unit, particularly showing a resulting tilting of a 20-degree wrist flexion of the swimmer relative to a pivot point of the system and, in phantom, a counterclockwise rotation of the propulsion unit relative to the forearm of the swimmer, the same corresponding to a minus 20 degree wrist flexion about the pivot point.

[0021] FIG. 8 is a general system component layout showing the inter-relationship of all electrical components of the instant invention.

DETAILED DESCRIPTION OF THE INVENTION

[0022] In the prior art, a swimmer has a tank on his back which is attached to him by a harness. A power unit is typically provided integrally with an impeller unit upon the tank or about a waist and forearm of a swimmer 10.

[0023] In the instant invention, two lithium batteries 16 and 16A (see FIG. 3), serve as the power supply of the system preferably connected in series to achieve an output of about 30V DC, and attached to a sleeve 18 or the like, which is typically be an extension of a wet suit of the swimmer 10. Within the sleeve 18 is forearm 19 and wrist 21 of the swimmer 10 from which extends thumb 24 and other fingers 26 of hand 22. The batteries 16/16A are in electrical communication with motor power controller 28 (see FIG. 2-4 and electrical block diagram of FIG. 8) which in turn drives a brushless motor 29 and an impeller 32 using a drive shaft 34. The batteries of the system are, as above noted, designed to attach to the sleeve or propulsion unit and can be connected or disconnected by the swimmer under or above the surface of the water. A cable connection (see FIG. 8) to the batteries may be removed by pulling their connections apart from cable 31 or simply removing cable 37 from the battery pack at point 33.

[0024] The impeller 32 is surrounded by a shroud 36 which functions as a nozzle thereby affording protection to the diver and of the impeller from foreign objects with which it might otherwise become entangled. As well, shroud or nozzle 36 also assures proper directionality of the thrust output of the system.

[0025] Propulsion unit 30 is secured to sleeve 18 by a bracket 38 (see FIGS. 2 and 3) which bracket includes a flat integral radial segment 40. Beneath bracket 38 is a flat elongate member 42 (see FIG. 4) which is bonded or otherwise secured to bracket 38 and which extends upwardly to a control handle 44, more fully described below.

[0026] Between sleeve 18 and elongate member 42 is a planar surface 46 which is secured to sleeve 18. See FIG. 4. Conformal to surface 46 is said elongate member 42. A pivot element 48 (also referred to as a quick release pin) is secured at its base within surface 46 such that member 42 as well as its associated bracket 38 and the entire prolusion unit 30 is rotatable about the axis of pivot element 48 using control handle 44 as a lever. The quick release pin may be a Clevis pin, thus enabling the necessary quick release, as may be needed. Also see FIG. 7. In addition, the pivot element (quick release pin) 48 provides at least the following additional functions:

[0027] 1. It secures the propulsion unit 30 (see FIG. 6) to the swimmer's arm 19 by joining the planar surface 46, elongate member 42 and bracket 38 where the quick release pin 48 is inserted and through each of said elements while also permitting the pivoting of the propulsion unit 30/32/36.

[0028] 2. Disengagement and removal of the quick release pin 48 allows the separation of the planar surface 45, elongate member 42 and bracket 38, permitting the propulsion unit to separate from the swimmer if desired, while concurrently permitting pivoting to continue until pin 48 is removed.

[0029] All components, including the power unit, power supply and propulsion unit can reside and operate below the swimmer's elbow if no cables or physical connections along the swimmer's upper arm 19 or around his shoulders, neck, head, torso, hips, legs or feet exist.

[0030] A front view of the system along the axis of control handle 44 is shown in FIG. 5. Therein may also be seen Hall effect voltage controller 50. Depression of the button thereof regulates a pulsed width modulation (PWM) circuit 52 (see FIG. 8) which in turn acts on the motor power controller 28, which in turn regulates the DC power supplied by the power supply 16/16A to brushless motor 29 and, therewith, the extent of thrust that is generated by impeller 32. The electrical connections of block diagram of FIG. 8 are not shown in the mechanical renderings of FIGS. 2-7, which are well within the skill of one of ordinary skill in the art to provide in light of the disclosure herewith.

[0031] It is to be appreciated that Hall effect voltage controller 50, housed at a proximal end control handle stick 44, provides access by thumb 24 of the swimmer, either with or without use of one's other fingers 26. Further, it should be appreciated that pivot element 48 in combination with elongate member 42, and the elongated geometry of control handle 44, permit ease of mechanical rotation of the entire propulsion unit 30. See FIG. 4. That is, handle 44 in combination with member 42 permit the power unit 30 to be easily pivoted about said element 48. See FIG. 7.

[0032] FIG. 6 is a side view taken along the axis of control handle 44 in the direction shown along Line 6-6 of FIG. 3.

[0033] With respect to FIG. 7, there may be seen positive and negative angulations of degrees of pitch of the propulsion unit that may be readily accomplished by extension or flexion of the wrist of the swimmer while engaging control handle 44. This, among other aspects, differs from the teaching of Bruce above (U.S. Pat. No. 5,024,178) in that positioning requiring movement of the shoulder or elbow of the swimmer is not necessary. Rather, one need only engage control handle 44 with the hand while flexing or extending the wrist to accomplish changes in degree of pitch of the propulsion unit, shown in FIGS. 7 and 8. Using the thumb, the Hall effect voltage controller 50 is also able to also control the degree of thrust generated by the instant system. As such, both to the pitch, either negative or positive relative to the axis of the body of the swimmer, as well as the thrust output of impeller 32, may be readily controlled by simple movements of the hand, wrist and forearm of the swimmer.

[0034] If desired, a similar assembly may be provided upon the other forearm of a swimmer, the controls of which may be operated independently of those upon the first forearm of the swimmer.

[0035] With further regard to the electrical block diagram of FIG. 8, in a preferred embodiment, the PWM signal of circuit 52 will define a frequency of about 50 Hertz and include modulated pulses having a width of between about 1 and about 2 milliseconds, with a repetition of such pulses of about 20 milliseconds each. Further, through the use of Hall effect controller 50, the output voltage of DC power supply 16/16A will fall within a range of 0 to about 30 volts DC.

[0036] Many of the components of the present system are readily available to the public. For example, an appropriate Hall effect switch, providing a linear output using a push button control is sold by Otto Engineering of Carpentersville, Ill. 60110. An appropriate thruster corresponding to elements 32, 36 and 40 above is sold by CrustCrawler of Gilbert, Ariz. 85233. An appropriate product of CrustCrawler is their 50 volt rated 400 HFS-L high-flow thruster. Other suitable thrusters, such as the Sea Botix 150, are sold by Hollis Gear of Irvine, Calif. Further, an appropriate brushless DC motor may be purchased from CrustCrawler.

[0037] In view of the above, it is to be appreciated that there is provided a propulsion system in which the power source thereof is self-contained and which may be readily positioned relative to the forearm of the swimmer without need for any anatomical intervention other than that of the use of a wrist and hand of one arm of the swimmer. This excludes the need for any form of external electrical or mechanical connection beyond the immediate area of the propulsion unit that constitutes a risk factor in prior art solutions such as that of Bruce, above.

[0038] While there has been shown and described above the preferred embodiment of the instant invention it is to be appreciated that the invention may be embodied otherwise than is herein specifically shown and described and that, within said embodiment, certain changes may be made in the form and arrangement of the parts without departing from the underlying ideas or principles of this invention as set forth in the Claims appended herewith.