192 clutches and power-stop control – Stop mechanism – Overload release
Patent
1989-06-14
1990-12-25
Braun, Leslie A.
192 clutches and power-stop control
Stop mechanism
Overload release
49 28, 74425, 318469, 318475, F16D 7100
Patent
active
049796038
ABSTRACT:
A universal load sensing gearbox integrating a safety mechanism for use, for instance, with motor driven closures, such as garage doors, barriers and gates, includes a housing which encases a worm slidably mounted on an input shaft and adapted for rotation therewith. The input shaft is connected with the motor driving the closure. The worm is engaged with a worm gear which is mounted on an output shaft which is connected with the closure. Dished washers are provided generally around the input shaft at both ends of the worm to urge the worm in a central meshed engagement with the worm gear. A motion transmission device is provided on the worm and is adapted to slide therewith to detect a longitudinal movement thereof and to transmit this movement to an actuating device which is adapted to stop and/or reverse the motor. Therefore, sufficient resistance to the rotation of the output shaft resulting, for example, from the closure encountering an object pressure, causes the worm to be displaced along the input shaft against the dished washers along with the transmission device. A sufficient movement of the transmission device causes the actuating device to trip a limit switch which triggers the stoppage and/or reversing of the motor. The load sensing gearbox is also intended for agricultural applications using reducing gearboxes, for actuating aircraft wing flaps, for conveyer belts, etc.
REFERENCES:
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patent: 3219902 (1965-11-01), Sibley
patent: 3633313 (1972-01-01), Lafontaine
patent: 3851538 (1974-12-01), Denkowski et al.
patent: 4750294 (1988-06-01), Lafontaine
501 Manaras Auto Doors, Inc.
Anchell Scott
Braun Leslie A.
Meerkreebs Samuel
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