Tent – canopy – umbrella – or cane – Canes – sticks – crutches – and walking aids – Walker type
Patent
1997-02-12
1998-04-21
Mai, Lanna
Tent, canopy, umbrella, or cane
Canes, sticks, crutches, and walking aids
Walker type
135 70, 482 68, A61H 300
Patent
active
057408254
ABSTRACT:
An articulated stair walker for traversing staircases including a frame with first and second side sections. Each side section includes a vertical front leg, a vertical rear leg, a horizontal upper tie bar and a horizontal lower tie bar. Each tie bar is pivotally coupled to a front and rear leg of a side section. The side sections are coupled together by an upper and a lower cross bar rigidly affixed between the vertical front legs. Further provided is a lock pin being slidably coupled to each of the side sections and operated by a lever in an L-shaped configuration. One quadrant cam with a plurality of slots is coupled to each of the lower horizontal tie bars. Associated therewith is a lock pin movably coupled to one of the sections and positionable within a slot of the quadrant cam. By this structure, the user may lift the lock pin upwardly to allow the rear legs to be moved downward relative to the front legs. When properly displaced, to accommodate the stair riser height, the operating lever is released to lock the lock pin in the quadrant cam slot.
REFERENCES:
patent: 2708473 (1955-05-01), Gable et al.
patent: 2796916 (1957-06-01), Womble
patent: 3176700 (1965-04-01), Drury
patent: 3387618 (1968-06-01), Swann
patent: 3421529 (1969-01-01), Vestal
patent: 3455313 (1969-07-01), King
patent: 4094331 (1978-06-01), Rozsa
patent: 4248256 (1981-02-01), Thomas
patent: 4434808 (1984-03-01), Burak
patent: 5349977 (1994-09-01), Wood
patent: 5649558 (1997-07-01), Richard
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