Tent – canopy – umbrella – or cane – Canes – sticks – crutches – and walking aids – Crutches
Patent
1994-03-24
1994-10-04
Mai, Lanna
Tent, canopy, umbrella, or cane
Canes, sticks, crutches, and walking aids
Crutches
135 69, 135 72, 135 75, A61H 302
Patent
active
053517016
ABSTRACT:
A crutch structure including an armpit seat, a lateral tube assembly having two lateral tubes, a handle assembly, a middle supporting tube, a bottom cap and a telescopic tube. The lateral tubes are symmetrically arranged, each including an outer semi-circular tube section and an inner rectangular beam section. Multiple aligned pairs of transverse through holes are formed on predetermined portions of the lateral tubes. Lower portions of the lateral tubes first extending downward and toward each other and then extending straight downward in parallel with each other. The handle assembly is adjustably locked on the lateral tubes. The middle supporting tube includes a central circular tube section having multiple aligned pairs of circular through holes formed on front and back sides of the circular tube section, and two lateral substantially C-shaped outward open rib sections corresponding to the rectangular beam sections of the lateral tubes. The C-shaped rib sections of the supporting tube are engaged with rectangular beam sections of the lateral tubes the telescopic tube is adjustably fitted into the supporting tube at a height according to the height of a user.
REFERENCES:
patent: 127028 (1872-05-01), Crandall
patent: 904481 (1908-11-01), Hood
patent: 1296728 (1919-03-01), Yates
patent: 3730198 (1973-05-01), Johnston et al.
patent: 4476885 (1984-10-01), Stein
patent: 4637414 (1987-01-01), Urban
patent: 4865065 (1989-09-01), Chen
patent: 4869280 (1989-09-01), Ewing
patent: 4979533 (1990-12-01), Hansen et al.
patent: 5197502 (1993-03-01), Wang
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