Brake mechanism for motor driven projection screen

Details Brake mechanism for motor driven projection screen Brake mechanism for motor driven projection screen

1976-01-08

1977-11-22

Wintercorn, Richard A.

Flexible or portable closure, partition, or panel

Fabric fastening means

To elongated element

160310, 310 77, G03B 2156, H02K 710

Patent

active

040593398

ABSTRACT:
A brake mechanism for an electric motor used to drive a projection screen apparatus. The brake mechanism includes a first brake surface fixed to an exterior brake support about an end of the motor shaft projecting from the housing, a second brake surface adjustable on the shaft end and confronting the first brake surface, and a spring for normally urging the brake surfaces into engagement to prevent rotation of the shaft, and brake surfaces being urged apart and the action of the spring counteracted when the motor is operated as the rotor of the motor, which is carried by the shaft, aligns itself with the magnetic field generated by the stator of the motor.

REFERENCES:
patent: 2536491 (1951-01-01), Chapman et al.
patent: 2701036 (1955-02-01), Osborne
patent: 2745977 (1956-05-01), Tesh
patent: 3732447 (1973-05-01), Perhats
patent: 3784852 (1974-01-01), Noly

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