Movable or removable closures – Plural wings radiate from common pivot; i.e. – revolving – Successive position-type; e.g. – turnstile
Patent
1994-02-04
1995-07-25
Kannan, Philip C.
Movable or removable closures
Plural wings radiate from common pivot; i.e., revolving
Successive position-type; e.g., turnstile
474135, E06B 1108
Patent
active
054351006
ABSTRACT:
A control mechanism is provided for a turnstile of the type comprising a plurality of arms which meet at a central hub and are rotatable on a rotational axis. The turnstile is adapted to stop in a position with an arm forming a barrier across a passageway and is operable to rotate through an arc defined by the angle between adjacent arms when the control mechanism is actuated to allow a person to pass through the passageway. The control mechanism comprises a first gear wheel adapted to be mounted to the turnstile to rotate therewith on the rotational axis of the turnstile, and second gear wheel adapted to be driven by the first gear wheel. A drive means connects the first and second gear wheels together, and a release mechanism is adapted to co-act with the second gear wheel to releasably lock the second gear wheel against rotation each time said turnstile has rotated through the arc. An actuating mechanism is adapted to operate the release mechanism. Preferably the drive means comprises an endless chain which passes around the two gear wheels keeping the two gear wheels in registry with each other.
REFERENCES:
patent: 976115 (1910-11-01), Bard
patent: 2954726 (1960-10-01), Kerridge
patent: 3525176 (1970-08-01), Collins
patent: 3795075 (1974-03-01), Orzechowski
patent: 3978613 (1976-09-01), Hayward et al.
patent: 5146711 (1992-09-01), Gallenschutz et al.
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