초록 ▼

A self-adjusting crutch containing a central portion having both a fixed and a moveable central post, one of which nests within the other. A prepositionable height fastener cooperates with a coupling collar, both of which are disposed on the central portion to predetermine the amount of extension. W

A self-adjusting crutch containing a central portion having both a fixed and a moveable central post, one of which nests within the other. A prepositionable height fastener cooperates with a coupling collar, both of which are disposed on the central portion to predetermine the amount of extension. When the fastener and coupler are in cooperation, the leg can be extended and retracted repeatedly the exact same distance. An improved hand grip is also disclosed.

대표청구항 ▼

In an adjustable crutch having an arm piece, and a base boot, with a pair of spaced fixed lateral posts disposed on one end in the arm piece and on the other end in the base boot, the improvement comprising in combination: (a) a base boot having a central arm having a vertical throughbore, in which

In an adjustable crutch having an arm piece, and a base boot, with a pair of spaced fixed lateral posts disposed on one end in the arm piece and on the other end in the base boot, the improvement comprising in combination: (a) a base boot having a central arm having a vertical throughbore, in which throughbore is disposed, (b) an annular cylindrical coupler, said coupler having a central opening therethrough and being of a diameter large enough for a central portion to pass therethrough, said coupler having an outside threaded area; (c) a longitudinally adjustable central portion comprising a fixed central post disposed at one end in said arm piece and being nestable within a moveable central post, and the moveable central post being disposed through said coupler\s central opening; (d) a coupling collar having a central opening therein, said collar encircling said central portion and freely moveable therealong, said coupler having internal threads for threaded engagement with the outside threads of said cylindrical coupler; (e) a height adjustment fastener selectively securable to said moveable central post, said adjustment fastener having movement limiting means thereon which means cooperates with said collar for preventing movement of said collar past said fastener and causing said collar to rest on said means; (f) locking means on said moveable central post for releasably securing said moveable central post relative to said fixed central post; whereby when said crutch is in a first closed position with the moveable central post secured by said locking means proximate the arm piece, and said fastener is selectively secured at a desired location on said moveable post, the coupling collar rests on said fastener, and when it is desired to use said crutch, the locking means is released causing the moveable central post to pass through said coupler until the fastener impacts said coupler such that the collar can be threadedly engaged to said coupler; and said locking means is relocked at a point distant from said arm piece.