Movable or removable closures – Plural wings radiate from common pivot; i.e. – revolving
Patent
1994-11-17
1997-01-14
Kannan, Philip C.
Movable or removable closures
Plural wings radiate from common pivot; i.e., revolving
49141, 49506, E05D 1502
Patent
active
055927785
ABSTRACT:
A turnstile is disclosed which is easily adapted to operate in either a clockwise or counterclockwise direction of rotation and which does not permit reverse rotation during operation. Resistance to rotation in the reverse direction is achieved by means of a drag shoe mechanism. As a rotor mechanism rotates about a corresponding stator mechanism it trails a drag shoe by a rigid connecting rod, or drag arm, across a bearing surface. The drag arm is disposed at a non-perpendicular angle. In reverse motion the angularly inclined drag arm forces the drag shoe to jam into the bearing surface and thereby act as a brake. The turnstile is provided with a quick release wrench, an safety release bolt which protrudes beyond the housing of the turnstile mechanism, and emergency release instructions labels clearly visible on the top and pillar of the turnstile. Should a child, or other person, become trapped in the turnstile one may easily and quickly release the turnstile by inserting the wrench in the safety release bolt and loosening the mechanism. When loosened the mechanism, and hence the turnstile, swings freely in either direction.
REFERENCES:
patent: 2037397 (1936-04-01), Stevens
patent: 3978613 (1976-09-01), Hayward et al.
patent: 5072543 (1991-12-01), Tetherton
Brascon Architectural Products Inc.
Gierczak Eugene J. A.
Kannan Philip C.
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