Tent – canopy – umbrella – or cane – Canes – sticks – crutches – and walking aids – Crutches
Patent
1987-03-24
1989-08-01
Hafer, Robert A.
Tent, canopy, umbrella, or cane
Canes, sticks, crutches, and walking aids
Crutches
A61H 302
Patent
active
048525979
ABSTRACT:
A crutch having a telescoping section for adjusting its length. The length of the telescoping section is locked by a pair of detents on the inner telescoping tube popping through selected ones of many periodically recurring confronting holes formed in the outer telescoping tube. The upper and lower ends of the outer one of the telescoping tubes are riveted to spaced parallel upright members which form the weight carrying part of the crutch. The lower rivets to do not pass through the entire diameter of the telescoping section. Instead, heads of the rivets form bosses projecting radially inward from diagonally opposed points on the internal perimeter of the outer telescoping tube. The inner telescoping tube has a pair of longitudinal grooves forming tracks which receive and slide over the bosses formed by the rivet heads, for limiting the amount of rotational travel which may be experienced by the inner telescoping tube which cannot rotate far enough for the detent to be completely misaligned with the confronting locking holes. It can rotate far enough to ride over the perimeter of the holes, to enable a quick and easy length adjustment. Thus, as long as the inner telescoping tube is held in a rotated position, the locking detent is forced to pass extremely close to, but not directly over each of the confronting holes. As it so passes, the spring bias of the detent forces it to pass into the locking hole when the inner telescoping tube is released from its rotational position.
REFERENCES:
patent: 1035760 (1912-08-01), Walton
patent: 1284351 (1918-11-01), Jagielo
patent: 2453632 (1948-11-01), Lofstrand, Jr.
patent: 4509741 (1985-04-01), Smith
patent: 4625743 (1986-12-01), Harker
Mark Irving L.
Soni Varun
Hafer Robert A.
Medline Industries Inc.
Sam Charles H.
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