Tent – canopy – umbrella – or cane – Canes – sticks – crutches – and walking aids – Walker type
Patent
1995-09-27
1997-07-22
Mai, Lanna
Tent, canopy, umbrella, or cane
Canes, sticks, crutches, and walking aids
Walker type
135 69, 135 79, A61H 300
Patent
active
056495587
ABSTRACT:
A walker is designed for use on level and inclined surfaces and for ascending and descending stairs. The walker is a free standing support having a pair of front legs and a pair of rear legs and two horizontally disposed handles. The front legs are lengthened or shortened relative to the rear legs through hand actuated controls located on each handle. The leg adjusting mechanism is a rack mounted on each front leg in releasable engagement with a frame-mounted gear which holds the leg at a fixed length. The hand controls act to disengage and reengage the gears and the racks to permit the front legs to either extend or retract as follows: with the racks and gears disengaged, the front legs will extend under the force of gravity until stopped at the desired length by a surface such as a stair, or the front legs may be retracted by pushing the front legs against a firm surface such as a stair until the legs are at the desired length, whereupon the control reengages the gear and rack to fix the front legs at the desired length.
REFERENCES:
patent: 3176700 (1965-04-01), Drury, Jr.
patent: 3387617 (1968-06-01), Reiber
patent: 3800815 (1974-04-01), Birk
patent: 4411283 (1983-10-01), Lucarelli
patent: 4777973 (1988-10-01), Nakajima
patent: 5349977 (1994-09-01), Wood
Mai Lanna
Mulrooney John J.
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