Supports – Stand – Standard type
Patent
1978-03-29
1979-08-28
Staab, Lawrence J.
Supports
Stand
Standard type
403324, 403328, 248345, F16M 1104
Patent
active
041658540
ABSTRACT:
A chair locking device engageable with a movable member for retaining same in a selected position relative to a stationary support member. The locking device includes a barrel mounted on the stationary member and a plunger within the barrel having an eccentrically mounted pawl on the engagement end thereof movable into and out of a selected one of a plurality of sockets in the movable member in response to movement of a cam follower on the plunger along a cam surface of the barrel. The pawl is mounted on the plunger so that the pawl rotates into a downward position relative to the plunger axis when fully extended into the selected socket. Movement of the cam follower is effected by a handle in engagement with the cam follower and cooperating portions on the cam and lock structure retain the plunger at an end of its travel until relative movement is positively effected by rotating the handle. Additionally, downward force on the eccentrically mounted pawl is sufficiently high when a person is seated on the chair so that rotation and withdrawal of the pawl from the selected socket cannot normally be accomplished until the person arises from the seat.
REFERENCES:
patent: 701238 (1902-05-01), Williams
patent: 787038 (1905-04-01), Hahn
patent: 1491685 (1924-04-01), Eicher et al.
patent: 1610069 (1926-12-01), Weber
patent: 2113753 (1938-04-01), Wilson
patent: 3443784 (1969-05-01), Walkinshaw
patent: 3770236 (1973-11-01), Marsh et al.
patent: 4021126 (1977-05-01), Deeter et al.
patent: 4113221 (1978-09-01), Wehner
Cramer Industries, Inc.
Staab Lawrence J.
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