Electricity: motive power systems – Automatic and/or with time-delay means – Movement – position – or limit-of-travel
Patent
1995-05-26
1996-05-07
Cabeca, John W.
Electricity: motive power systems
Automatic and/or with time-delay means
Movement, position, or limit-of-travel
318466, 359841, 359877, G02B 7182, H02P 104
Patent
active
055149405
ABSTRACT:
The control device controls an electrically powered foldable rearview mirror in which a mirror body is reversibly rotatable around a shaft by an electric motor contained in the mirror body and in which the mirror body rotation is stopped in a predetermined erected position and folded position by rotation stop devices. The control device for controlling mirror rotation includes a switching circuit for switching the power supply connections to the motor to rotate the mirror body in one of two direction, a relay circuit for supplying and cutting off power to the motor and a relay control circuit connected to the relay circuit and the motor. The relay control circuit includes a resistance and a semiconductor device for switching the relay control circuit connected in parallel with the resistance to perform a switching operation when the motor driving electric current is increased due to a stoppage of the mirror body rotation which causes the voltage drop across the resistance to exceed a threshold voltage of the semiconductor device and to open or release the relay cutting off current to the motor.
REFERENCES:
patent: 4833876 (1989-05-01), Shimura
patent: 4973146 (1990-11-01), Nakayama
patent: 4981347 (1991-01-01), Nakayama
patent: 5315422 (1994-05-01), Sato et al.
Cabeca John W.
Murakami Kaimeido Co. Ltd.
Striker Michael J.
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