The present invention relates to walking aids and in particular to a walking cane having a shock absorbing tip.
Walking aids such as walking sticks, crutches and walkers are well known and have been available in many varieties to accommodate a person's need of support and ambulation. Also there are a variety of modifications and accessories to these aids to ergonomically improve the comfort and safety.
Most walking aids are provided with a rubber tip in an effort to provide stable engagement between the walking aids and the floor or other underlying support surface. In practice, however, it has been found that conventional rubber tips possess limitations which often result in severe injury to the user. For example, with most rubber tips the shaft of the walking aids needs to be held in substantially vertical alignment, so that the contact on the bottom of the tip is able to flatly engage the floor surface. Unfortunately, people frequently hold a walking aids at an outward angle from their bodies in an effort to steady themselves, so that the shaft extends at an angle to the floor rather than straight up and down. This causes the rubber tip to contact the floor at an angle, with only an edge of the tip engaging the floor surface. Consequently, when the person's weight bears on the cane at this angle, the tip tends to slide out, often causing the person to fall. Naturally, this problem is even more acute if the floor surface is slick or damp.
There are also numerous shock absorbing accessories added to the walking aids. However, these shock absorbing devices are intended to merely vertically absorb the impact of the cane or other walking aids on the floor surface or other underlying support surface.
While these walking aids fulfill their respective, particular objectives and requirements. They do not disclose an accessory for a walking aids which provides shockingly absorbing to reduce the impact as well as pivoting where the foot or tip of the accessory is maintained in a planar relationship with the supporting floor surface. In this regard where the foot or tip of the free end of the walking aid can be maintained in a parallel planar relationship with the floor supporting surface, no matter at what angle the walking aid is inclined relative to the supporting surface.
The present invention addresses the above and other needs by providing an adaptive ambulatory support includes a shock absorbing and pivoting tip assembly attached to the staff of a walking aid, such as a cane, crutch or walker. The shock absorbing and pivoting tip assembly includes a shock absorber sandwiched between a lower portion and an upper portion. The shock absorber may be a bendable spring or elastic material. The tip assembly enables the shaft of the walking aids to dynamically pivot without the loss of adherence of the lower portion to the floor surface and simultaneous provides the adaptive shock absorbing capability in any angle during ambulation.
In accordance with one aspect of the invention, there is provided an accessory for walking aids which provides shocking absorbing and reduced impact as well as pivoting where the foot or tip of the accessory is maintained in a planar relationship with the supporting ground surface. In this regard where the foot or tip of the free end of the walking aid can be maintained in a parallel planar relationship with the ground supporting surface, no matter at what angle the walking aid is inclined relative to the supporting surface.
The above and other aspects, features and advantages of the present invention will be more apparent from the following more particular description thereof, presented in conjunction with the following drawings wherein:
Corresponding reference characters indicate corresponding components throughout the several views of the drawings.
The following description is of the best mode presently contemplated for carrying out the invention. This description is not to be taken in a limiting sense, but is made merely for the purpose of describing one or more preferred embodiments of the invention. The scope of the invention should be determined with reference to the claims.
Where the terms “about” or “generally” are associated with an element of the invention, it is intended to describe a feature's appearance to the human eye or human perception, and not a precise measurement.
A side view of a cushioned walking stick tip 10 according to the present invention is shown residing on a generally horizontal surface 11 in
The tip assembly 10 provides an upper pivot 20 in the upper portion 18 and a lower pivot 28 in the lower portion 26. The attitude of the lower pivot 28 is generally fixed with respect to the generally horizontal surface 11 and is limited to movement resulting from deformation of the lower portion 26. The lower pivot 28 allows the angulation of the connecting rod 14 when a rod top stop 16 reaches the inner wall of the shaft 12. The force from the partial body weight and the angulation is passed from the shaft 12 to the rod top stop 16. The force applied to the rod top stop 16 causes the connecting rod 14 to pivot around the lower pivot 28.
The upper portion 18 and upper pivot 20 may both pivot and depress vertically under a load. The position of the upper pivot 20 is the location where the partial body weight bears on the shaft 12 and the compression force of the shock absorber 24 reach a balance. The partial body weight on the shaft 12 is different for each ambulation because of angulation, therefore the tip assembly 10 adaptively seeks the dynamically moving pivot until the balance of the forces is reached. The upper pivot 20 allows the angulation of the shaft 12 relative to both the upper portion 18 and the lower portion 26.
The location of the upper pivot 20 is established by an upper centering piece 22 fixed to the upper portion 18 and the lower pivot 28 may be established by a lower centering piece 30 fixed to the lower portion 26. The upper and lower centering pieces 22 and 30 are preferably disks embedded in the upper portion 18 and lower portion 26 respectively. The connecting rod 14 includes a rod top stop 16 at the top of the connecting rod 14 limiting pivoting about the upper pivot 20 by the connecting rod 14 by contact of the rod top stop 16 with the interior of the shaft 12, and a rod center stop 17 retaining the upper portion 18 on the connecting rod 14.
An upper pivot point 20 allows pivotal motion of the upper portion 18 of the walking aid 10 relative to the connecting rod 14 and the lower portion 26 while the rod top stop 16 is not touching the inner wall of the shaft 12. The connecting rod 14 is generally perpendicular to the lower portion 26 and the surface 11 when relaxed. The lower pivot 28 also allows the angulation of the upper portion 18 and the shaft 12 relative to the lower portion 26 and the surface 11 when the rod top stop 16 touches the inner wall of the shaft 12. Sufficient force on rod top stop 16 due the angulation of the shaft 12 may cause the connecting rod to 14 pivot at the lower pivot point 28.
The shock absorbing element 24 resides between the upper portion 18 and the lower portion 26 and is retained in place by the connecting rod 14. The shock absorbing element 24 may be a metal spring, elastic material, or any structure which is both compressible and flexible. An example of a suitable shock absorber 24 is a wave spring 24a shown in
The lower portion 26 preferably maintains in a parallel planar relationship with the surface 11.
The connecting rod 14 is ridged and resides substantially perpendicular to the lower portion 26 and surface 11 for small angular deflections of the shaft 12, and supports dynamic pivoting of the upper portion 18 about the lower pivot 28. The connecting rod 14 is also a mechanical guide which guides the upper portion 18 to move up and down along the connecting rod 14 during ambulation. The connecting rod 14 is a safety device to prevent the upper portion 18 and shaft 12 from over tilting, causing contact of the rod top stop 16 with the shaft 12, which may cause a user to fall.
While the invention herein disclosed has been described by means of specific embodiments and applications thereof, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope of the invention set forth in the claims.
The present application claims the priority of U.S. Provisional Patent Application Ser. No. 62/262,727 filed Dec. 3, 2015, which application is incorporated in its entirety herein by reference.
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