192 clutches and power-stop control – Stop mechanism – Overload release
Patent
1982-06-09
1986-01-14
Bonck, Rodney H.
192 clutches and power-stop control
Stop mechanism
Overload release
49 28, 49199, 192 67R, 474134, E05F 1516, E05F 1520, F16P 500
Patent
active
045640980
ABSTRACT:
A door operated drive assembly comprising an electric drive motor mechanically connected to a door pulling device by a transmission in the form of a belt drive or the like, utilizes an extension of a plate that is swingable in response to deviations of application pressure of the drive belt on belt guide pulleys carried thereby to trigger a switching arrangement utilized to trigger stopping or reversal of the drive motor. In order to make actuation of the switching arrangement a function of the degree of pressure applied by the drive belt, the plate is elastically loaded toward a middle position of its range of swingable movement. The elastic loading of the plate in accordance with a first embodiment is by way of two-arm springs positioned at opposite sides thereof, and in a second embodiment is produced by helical springs which act via actuators, on opposite sides of the plate extension. In both embodiments, the extension reaches to a position adjacent the switching arrangement, but, in the first embodiment, the extension comprises a pair of shields and the switching arrangement comprises a single photoelectric arrangement disposed therebetween, while, in the second embodiment, the extension is a straight projecting arm and the switching arrangement is a pair of switches disposed at opposite sides thereof. In accordance with a feature common to either embodiment, the drive arrangement is mounted in a multiple-component housing that comprises two components which are shiftable relative to each other between an operating position in which the drive motor is mechanically connected to a door pulley means, and a disconnected position in which the mechanical connection is interrupted.
REFERENCES:
patent: 2114633 (1938-04-01), Hedges
patent: 2387533 (1945-10-01), Schmucker
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patent: 2900831 (1959-08-01), Wilson et al.
patent: 3012520 (1961-12-01), Curtis
patent: 3403474 (1968-10-01), Spasoff
patent: 3480746 (1969-11-01), Fry
patent: 4099704 (1978-07-01), Okumura et al.
patent: 4131830 (1978-12-01), Lee et al.
Bonck Rodney H.
Hormann KG
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