Joints and connections – Articulated members – Lockable at fixed position
Patent
1974-07-03
1976-03-30
Schroeder, Werner H.
Joints and connections
Articulated members
Lockable at fixed position
135 50, 2481885, 248403, 248423, 403325, 403327, 403379, F16D 112
Patent
active
039471403
ABSTRACT:
A crutch construction for underarm and forearm crutches, wherein the handgrip is mounted, at least in part, forward of the longitudinal axis of the crutch, and the arm support is mounted, at least in part, rearward of said longitudinal axis. The arm support is adjustably mounted for movement at an angle within a range of about 5.degree.-20.degree. to said longitudinal axis. The thrust line of the crutch is located slightly forward of the longitudinal axis of the crutch. The handgrip is substantially centered relative to the thrust line of the crutch, and the longitudinal axis of the handgrip is substantially normal to said thrust line. The arm support is laterally adjustable relative to the handgrip for proper palm placement and wrist angulation and to enable to the user of the crutch to apply a forward rotational bias to the crutch sufficient to hold the arm support securely and comfortably against the arm of the user, but insufficient to render the crutch unstable.
The crutch construction herein claimed includes an adjustable spring-urged locking element which interlocks the respective movable parts and impresses a spring bias upon them to dampen relative movement between them.
REFERENCES:
patent: 2620210 (1952-12-01), Wuster
patent: 2741255 (1956-04-01), Neptune
patent: 2932047 (1960-04-01), Johnston
patent: 3526040 (1970-09-01), Young
patent: 3635233 (1972-01-01), Robertson
patent: 3710807 (1973-01-01), Ferry
patent: 3768495 (1973-10-01), Smith
Berman Conrad L.
Schroeder Werner H.
Temco Products, Inc.
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