Brakes – Internal-resistance motion retarder – Controlled by an operator remote from retarder
Patent
1990-04-09
1991-04-02
Butler, Douglas C.
Brakes
Internal-resistance motion retarder
Controlled by an operator remote from retarder
280707, 36442405, F16F 946
Patent
active
050040804
ABSTRACT:
A controlling circuit for an actuator which is provided with a change-over switch for selecting a desired rotational position of a rotating shaft of the actuator, exciting circuit forming device for selectively magnetizing a plurality of electro-magnets in order to control rotation of the rotating shaft to be in a selected desired rotational position in response to an outputted change-over signal, and electrifying switching device for supplying electricity to the electro-magnets only for a predetermined duration from the time when selection of the rotational position of the rotating shaft is changed over by the change-over switch, wherein there is no generated any unnecessary heat for the actuator and construction of the circuit can be more simplified.
REFERENCES:
patent: 4526401 (1985-09-01), Kakizaki et al.
patent: 4624477 (1986-11-01), Kumagai et al.
patent: 4776437 (1988-10-01), Ishibashi et al.
patent: 4965878 (1990-10-01), Yamagiwa et al.
Butler Douglas C.
Mitsubishi Denki & Kabushiki Kaisha
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