Land paddle

Abstract

A device for support and propulsion comprising a shaft, a spring element coupled to the shaft, and a swing arm coupled to the shaft and the spring element. A lower portion of the spring element comprises a ground interface, optionally comprising a wheel.

Claims

1. A land paddle apparatus for support and propulsion, the apparatus comprising: a shaft comprising an upper portion and a lower portion; a spring element with an upper and a lower end, the upper end of the spring element coupled to the lower portion of the shaft; and a swing arm comprising an upper end and a lower end, the upper end of the swing arm coupled to the lower portion of the shaft, and the lower end of the swing arm coupled to an intermediate portion of the spring element.

2. The apparatus according to claim 1, wherein the upper end of the spring element is coupled to the lower portion of the shaft above where the upper end of the swing arm is coupled to the lower portion of the shaft.

3. The apparatus according to claim 1, wherein the lower portion of the shaft terminates in a bottom end, and the upper end of the swing arm is coupled to the bottom end of the shaft.

4. The apparatus according to claim 1, wherein the spring element is flexible within a plane defined by the spring element and the shaft, and inflexible outside of the plane.

5. The apparatus according to claim 1, wherein the upper end of the swing arm is coupled to the lower end of the shaft by a coupling which hinges within a plane defined by the spring element and the shaft, and is rigid outside of the plane.

6. The apparatus according to claim 1, wherein the lower end of the swing arm is coupled to the intermediate portion of the spring element by a coupling which hinges within a plane defined by the spring element and the shaft, and is rigid outside of the plane.

7. The apparatus according to claim 1, comprising a wheel rotatably coupled to the lower end of the spring element.

8. The apparatus according to claim 7, wherein the wheel is rotates in only one direction.

9. The apparatus according to claim 8, wherein the wheel is coupled to the lower end of the spring element by a directional bearing.

10. The apparatus according to claim 1, wherein the spring element is a C-shaped spring.

11. The apparatus according to claim 1, wherein the spring element is a leaf spring.

12. The apparatus according to claim 1, wherein the spring element has a width perpendicular to a plane defined by the spring element and the shaft, and the spring element has a depth parallel to the plane that is less than the width of the spring element.

13. The apparatus according to claim 1, wherein the lower end of the spring element comprises a padded foot.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Exemplary embodiments are illustrated in referenced figures of the drawings. It is intended that the embodiments and figures disclosed herein are to be considered illustrative rather than restrictive.

(2) FIG. 1 shows a side view of a propulsion and support device in accordance with the present disclosure, showing a land paddle having a shaft with a handle, a spring element mounted to the shaft adjacent an end opposite the handle, a padded foot at a distal end of the spring element, and a hinged arm extending between an end of the shaft and an intermediate section of the spring element.

(3) FIG. 2 shows a rear view of a lower portion of the paddle of FIG. 1 showing the lower portion of the shaft, the upper mounting of the spring element to the shaft, and the padded foot of the paddle.

(4) FIGS. 3A and 3B, respectively, show an exemplary embodiment in an uncompressed and a compressed state.

(5) FIG. 4 shows a side view of an alternative embodiment of a propulsion and support device, with a wheel mounted at a distal end of the spring element.

DESCRIPTION

(6) Throughout the following description specific details are set forth in order to provide a more thorough understanding to persons skilled in the art. However, well known elements may not have been shown or described in detail to avoid unnecessarily obscuring the disclosure. Accordingly, the description and drawings are to be regarded in an illustrative, rather than a restrictive, sense.

(7) A support and propulsion device in accordance with one embodiment of the present disclosure is shown in FIGS. 1 and 2. Such a device, for example paddle 10, may include a shaft 12 having an upper portion 14 and a lower portion 16 and an upper end 18 and a lower end 20. Shaft 12 may include a coupling 22 between upper portion 14 and lower portion 16. Coupling 22 is typically fixed, or may be releasable or adjustable, e.g. in length and/or in relative orientation to the upper and lower portions. Alternatively, shaft 12 may be formed of a unitary structure. Shaft 12 is typically light weight and substantially rigid over an operating range of the device. Shaft 12 may be formed for example of aluminum or carbon fiber, may be a hollow tube, or use such other material and construction as suited to a particular application of the device.

(8) One or more grip-enhancing structures, such as a T-shaped handle 24, may be attached to shaft 12, typically adjacent upper end 18 and/or in the upper portion 14 of shaft 12, or at any location suited to a use of the device. Handle 24 may be attached by a coupling 26 to shaft 12, providing a fixed, releasable, or adjustable connection to shaft 12. Handle 24 may alternatively by formed integrally with shaft 12. Handle 24 may be a molded one-piece handle of lightweight plastic or other material, or formed of any construction suitable to the particular application of the device.

(9) A spring, such as a C-shaped spring 28, may be coupled to shaft 12, typically adjacent lower end 20 of shaft 12. Spring 28 is typically a leaf spring, for example, or any other flexible, resilient element as suited to a particular application. Spring 28 may flex substantially in a single plane, such as plane P, and be substantially inflexible outside of, or perpendicular to, plane P over the expected operating range of a particular device. Alternatively, spring 28 may be configured to provide for a greater or lesser degree of flexibility perpendicular to plane P, for example as suited to a user's preference.

(10) Spring 28 may include an upper end 36 attached by coupling 38 to lower portion 16 of shaft 12. Coupling 38 may be a fixed coupling, for example, provided by a nut and bolt in through-holes in each of coupling 38 and shaft 12, or may be releasable or adjustable by the user.

(11) An attachment point may be provided adjacent lower end 20 of shaft 12 such as by a metal fitting 40, for mounting a swing arm 42. Swing arm 42 may extend to an intermediate portion 44 of spring 28. Intermediate portion 44 of spring 28 may be any location on spring 28 below the middle of spring 28.

(12) Swing arm 42 may have a first end 46 with a hinged coupling 45 to shaft 12, for example by a nut and bolt. Swing arm 42 may have a second end 48 with a hinged coupling 47 to intermediate portion 44 of spring 28, for example a nut and bolt. Swing arm 42 may be coupled to shaft 12 and spring 28 so that swing arm 42 hinges substantially within plane P, and does not hinge substantially outside of plane P.

(13) Spring 28 may include a lower end 50 having a ground-contact interface, such as foot 52, which may be coupled to spring 28 by any suitable means, such as by one or more nuts and bolts. Foot 52 may be curved and/or padded, for example by a rubber sole 54, or provided with a structure as best suited to a particular application of the device. The configuration of spring 28 may be such that when spring 28 is not compressed, a center of foot 52 is substantially within a plane defined by shaft 12.

(14) As one of ordinary skill in the art will understand, a user, for example a skateboard rider, may hold shaft 12 in one or both hands while standing on a skateboard. The rider may bring foot 52 of paddle 10 into contact with the ground G and apply and release force substantially along the length of shaft 12, as indicated by arrows U. Additionally, the rider will typically be applying torsional and flexing forces to shaft 12. Spring 28 may flex in response to such forces, primarily by compressing and expanding as indicated by arrows F within plane P, and typically to a lesser extent torsionally and by flexing in a plane perpendicular to plane P as shown by arrows S in FIG. 2. Spring 28 may have a width 56, shown in FIG. 2, greater than its depth 58, shown in FIG. 1, to constrain the flexing of spring 28 substantially within plane P as shown by arrows F in FIG. 1, and to minimize side-to-side flexing as indicated by arrows S in FIG. 2, within typical operating ranges of forces applied by the rider.

(15) In some embodiments, one or more of couplings 38, 45 and 47 may be configured to hinge substantially within plane P, and be substantially rigid to movement outside of plane P. For example, one of more of couplings 38, 45 and 47 may comprise a nut and bolt fastened through two or more aligned holes, or a hinge.

(16) FIGS. 3A shows an example embodiment where swing arm 42 is configured so that an angle 20A between swing arm 42 and shaft 12 is approximately 120 degrees, when spring 28 is uncompressed.

(17) FIG. 3B shows an example embodiment where spring 28 is configured so that an angle 20B between swing arm 42 and shaft 12 is approximately 90 degrees when spring 28 is fully compressed. In alternative embodiments, spring 28 may be configured so that an angle 20B between swing arm 42 and shaft 12 is less than 90 degrees when spring 28 is fully compressed.

(18) FIG. 4 depicts an alternative embodiment of paddle 10, wherein foot 52 comprises a wheel 60. Wheel 60 may be attached to lower end 50 of spring 28 by any suitable means which allows wheel 60 to rotate relative to spring 28. Wheel 60 is mounted to rotate substantially within plane P, and parallel to the direction in which spring 28 flexes.

(19) In some embodiments, wheel 60 is configured to rotate only in one direction. In these embodiments, wheel 60 may be coupled to spring 28 for example by a directional bearing. Optionally, wheel 60 may be configured to rotate only in a direction R.

(20) In other embodiments, foot 52 may comprise more than one wheel 60.

(21) While a number of exemplary aspects and embodiments have been discussed above, those of skill in the art will recognize certain modifications, permutations, additions and sub-combinations thereof. It is therefore intended that the following appended claims and claims hereafter introduced are interpreted to include all such modifications, permutations, additions and sub-combinations as are consistent with the broadest interpretation of the specification as a whole.