Tent – canopy – umbrella – or cane – Canes – sticks – crutches – and walking aids – Walker type
Patent
1992-09-04
1993-11-23
Friedman, Carl D.
Tent, canopy, umbrella, or cane
Canes, sticks, crutches, and walking aids
Walker type
135 74, A61H 300
Patent
active
052635066
ABSTRACT:
A walker for assisting a physically impaired person in ascending and descending stairs has the four legs pivotally attached to the upper frame of the walker. When the walker is in use, the legs are locked against any pivotal movement; so that the walker provides a stable support for the person using it. When stairs are to be negotiated, a locking member is released to permit relative pivotal movement of the legs with respect to the side portions of the walker frame to be effected. Thus, the front of the frame may be lifted relative to the rear, causing the legs to pivot generally toward the rear by an amount sufficient to permit the front legs to be placed on a step of a staircase. After this has been done, the legs again are locked into position; and the walker maintains this relative position so that the person using it may negotiate the stairs. A reverse of this operation is effected for descending stairs. The locking member is in the form of a rack and pinion gear arrangement with a provision made for preventing relative movement of the legs whenever the locking member is operative.
REFERENCES:
patent: 906845 (1908-12-01), Adair
patent: 2708473 (1955-05-01), Gable
patent: 2855024 (1958-10-01), Robb
patent: 3176700 (1965-04-01), Drury
patent: 3387617 (1968-06-01), Reiber
patent: 3387618 (1968-06-01), Swann
patent: 3421529 (1969-01-01), Vestal
patent: 3455313 (1969-07-01), King
patent: 3800815 (1974-04-01), Birk
patent: 4777973 (1988-10-01), Nakajima
Friedman Carl D.
Ptak LaValle D.
Wood Wynn
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