The first application of a walking cane may well have been a stick employed by Homo Erectus a million years ago on the Serengeti plains of East Africa. Their usefulness has proven so effective that they have persisted down through the ages. The cane system. presented here provides a high degree of perfection in walking cane technology.
Walking canes fall into one of two broad categories; (1) the trekking type intended to enhance stability for mountain hiking treks and (2) a cane intended to relieve discomfort as a result of physical injury or arthritic deterioration of a joint. One fundamental motivation for a dual system is to overcome the limitations of a single cane. While several dual cane systems have been proposed, the use of two independence canes has been limited in the past because of an impracticality of accomplishing simple tasks such as egressing a doorway, fetching a newspaper or dealing with any simple task where a free hand is necessary. Previous approaches are represented by U.S. Pat. Nos. 7,007,704 and 4,556,075 which disclose canes joined by means of pins, latches, hooks, buttons, bands, Velcro and designs that mimic an archer's quiver or a sword sheath. U.S. Pat. No. 763,273 depends upon a somewhat complicated lever system joined by two gears to two cams for separating hook and loop fasteners that connect two canes. It also has been suggested that canes can be joined by machine bolts and wing nuts. All of these techniques have been dubbed as quick and easy. From the viewpoint of previous cane designers a few seconds or even a minute were apparently considered as quick since engaging a latch, turning a wing nut or drawing a cane from a. quiver device was considered as easy. However, from the viewpoint of a user who relies upon a dual system to be independent the terms “quick” and “easy” has a different connotation. Quick and easy implies something so quick and easy that transitioning appears normal to a bystander and feels normal. to the user. Otherwise, a few seconds of any awkwardness and/or clumsiness can seem equivalent to an eternity of embarrassment to a handicapped person.
In view of these and other deficiencies in the prior art it is one object of the present invention to avoid the awkwardness and inherent slow transitions that characterize the prior art and to facilitate user-friendly (ergonomic) operation.
It is another object of at least one embodiment of the invention to provide a dual cane system in which two canes are coupled together for use in one hand and held in place solely by the gravitational weight of the cane.
Another object of the invention is to provide a way to facilitate rejoining two canes together in which one of the canes is easily guided into place with respect to the other cane through a natural hand and wrist movement by the user.
Yet another object is to provide a duplex cane system of the type described in which the canes are self-aligning when being recoupled to one another.
Another object is to provide a dual walking cane system that lends itself to be formed from various material such as wood, plastic or metal yet enables the canes to be easily coupled and uncoupled from one another with little effort while remaining in substantial horizontal alignment with one another, i.e., without one cane having to be raised above the users head to allow them to be separated.
Still another object is to provide a guide operatively associated between the canes that has the ability to line up the one or more pairs of coupling connectors used for holding the canes together.
Another object is to provide an improved duplex cane system in which a handle of at least one of the canes can be either a ball handle or pistol-grip style handle.
Yet another object of the invention is to provide a duplex cane system in which at least one magnet is used to hold two canes in contact with one another while also assisting in bringing together a pair of self-aligning connector elements.
These and other more detailed and specific objects and advantages of the invention will be better understood by reference to the following figures and detailed description which illustrate preferred forms of the invention by way of these examples that are but a few of the various forms of the invention within the scope of the appended claims.
A brief analysis of how people walk is educative. While walking normally without a cane, two feet are simultaneously in contact with the ground about 20 percent of the time. Thus, 80 percent of the time only one foot is in contact with the ground. Walking stability results from the combination of foot-ground contact time while the brain orchestrates changes in body posture that best enhance stability. Body posture correction is an automatic brain function that takes place without conscious effort.
The application of a cane is equivalent to a third leg/foot because the brain can sense a force input transmitted through the cane to the body via hand and arm. With a cane in use there are always two contact points with the ground, and about 20 percent of the time there are three contact points with the ground. It is this additional distribution of foot-ground contact time that permits a single cane to sustain a greater level of stability while reliving joint discomfort.
It is also recognized that forces on leg joints may be unloaded by using the cane to support a portion of the body weight. Thus, the cane is also an instrument that can be used to relieve discomfort. The relationship between force and discomfort is non-linear. For example, a 20 percent decrease in joint force can relieve discomfort by 40 percent. However, 100 percent reduction in joint force will not relieve discomfort by 100 percent. There is also a cane manipulation factor. Force on a joint is best unloaded by leaning on the cane rather than deliberately pushing the cane. This principle may be demonstrated by standing in place while leaning on the cane rather than standing in place while pushing on the cane. Leaning on a cane produces a difference sensation than just pushing on a cane. Ultimately, the force created by leaning must be balanced by a force transmitted to the hand/arm, However, when the skill of leaning is achieved, the hand force is not produced by compulsion. Rather, the hand force is a natural consequence of leaning and it takes place subconsciously. A little practice is necessary to learn how to lean on the cane while walking rather than pushing on the cane while walking. The objective is to use the cane in a way to maximize user support while walking rather than the user supporting the cane.
Since a single cane does wonders to enhance walking stability while reliving discomfort, application of a dual cane system will demonstrate far superior performance over that of a single cane. A dual cane system will allow three points to always be in contact with the ground and during part of the walking cycle there will be four points in contact with the ground. There is a synergetic effect associated with these additional foot-ground contact points. Stability in walking can be enhanced by an order of magnitude and relief of discomfort can be substantial. The present invention amplifies the advantage of these characteristics. What may be impossible to negotiate with a single cane becomes possible with a dual system. The present dual cane system can eliminate the use of a walker and in some cases can replace a wheelchair. The present invention is also an excellent solution in cases where stability is a primary concern and discomfort is secondary. Most importantly, the present dual system allows the user to maintain his/her independence. One hallmark of the present invention is the friendliness (ergonomic benefit) it offers during transitioning between a single cane mode to a dual cane and back to a single cane.
In accordance with the invention a walking cane system is provided that comprises a pair of canes which are adapted to function separately or connected to one another for use in one hand. Anterior and posterior canes each comprise an elongated shaft with upper and lower ends having a middle part between them and a handle at the upper end of each shaft. An upper coupling is provided in one preferred embodiment of the invention to secure the canes the together at or above the middle part of the cane system. There is a guide on at least one of the canes that can be formed from a pair of spaced apart guide members extending from one cane toward the other cane when the canes are connected. During use the guide is adapted to receive the shaft of the other cane which can be easily inserted into the guide by placing the shaft of one cane between the guide members such that the anterior and posterior canes can be brought toward one another to approach or achieve an aligned relationship and held together in one embodiment by the gravitational weight of the cane. In one form, the canes are constructed and arranged for being disconnected by manually separating the anterior cane handle from the posterior cane handle so that the upper coupling is disconnected and the shaft of the other cane is then free to move away from the guide such that the anterior and posterior canes are thereby able to be separated while in substantially horizontal alignment with one another in position to be used. The canes can then be used separately with one held in each hand of the user without manually raising one cane its entire length above the other. In this way a user-friendly walking cane system is provided that eliminates the clumsiness, embarrassment and awkwardness associated with prior dual cane systems.
The foregoing features, objects and advantages of the invention will become apparent to those skilled in the art from the following detailed description of a preferred embodiment, especially when considered in conjunction with the accompanying drawings in which like numerals in the several views refer to corresponding parts.
This description of the preferred embodiments is intended to be read in connection with the accompanying drawings, which are to be considered part of the entire written description of this invention. Terms such as “connected”, “connecting”, “attached”, “attaching”, “join” and “joining” are used interchangeably and refer to one structure or surface being secured to another structure or surface or integrally fabricated in one piece, unless expressively described otherwise.
Refer now to
At the top end 16 of the posterior cane is a rearwardly extending pistol grip style horizontally extending handle 18. The handle 18 can be provided with finger grip indentations 18a to make the handle easier to hold and is attached to the shaft 14 by means of dowel pins 19. The upright shaft 20 of the posterior cane 14 has a guide comprising a pair of aligned laterally spaced apart forwardly projecting, parallel guide plates 22 and 24 which when the cane system is assembled as shown in
At the upper end of the elongated shaft of the forward cane 12 is provided a handle of any suitable shape but preferably comprises a ball-shaped handle 44 or if desired a rearwardly extending horizontally disposed pistol grip style handle similar to 18 (not shown). The handle 44 is of a suitable size to fit comfortably in the hand when the canes are separated as separated in
As can be seen in
In order for the center line of the anterior cane to meet a center point of the bottom wall 30, it is preferred that the center line of the shaft 13 be positioned rearwardly of the center line of shaft 14 by an angle D as shown in
When in stowed position the two canes 12 and 14 together can be used as a single cane by either hand so that one hand is freed up to perform other tasks. The anterior cane can be easily retrieved while continuing to walk by lifting the handle 44 upwardly a small distance, e.g., from ¼ inch to an inch or two and slightly forwardly with the canes in substantial horizontal alignment. This movement is so natural that it can be accomplished using the ball handle 44 without eye contact. With some practice, stowage of the anterior cane can be accomplished while walking.
Refer now to
Cylindrical magnets such as magnet 76 can also be mounted in bore holes such as 78 and 80 in the position shown to bring the anterior and posterior canes into the aligned position of
At the lower ends of the posterior cane shaft is provided a guide indicated generally by the numeral 86 which includes a pair of vertically disposed laterally spaced apart forwardly extending guide plates 88 and 90 only parts of which are shown that is secured as by welding to the posterior cane 54 to extend forwardly for receiving between them the lower end of the anterior cane 50. Extending between the forward ends of the guide plates 88 and 90 is provided an anterior wall 92 and between their lower edges a bottom wall 94 which together form an upwardly opening cup that serves as a coupling which cooperate with the magnets 82 and 84 to releasably hold the lower ends of the canes in alignment with one another while the anterior cane 50 is in the stowed position of
As in
This invention has been described herein in considerable detail in order to comply with the patent statutes and to provide those skilled in the art with the information needed to apply the novel principles and to construct and use such specialized components as are required. However, it is to be understood that the invention can be carried out by specifically different equipment and devices, and that various modifications, both as to the equipment and operating procedures, can be accomplished without departing from the scope of the invention itself.
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