Double-acting rotary drive for a control device

Details Double-acting rotary drive for a control device Double-acting rotary drive for a control device

1987-06-01

1988-10-25

Leung, Philip H.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

192139, 73843, 25112913, 74686, 74337, 74802, 74705, H02H 708

Patent

active

047807857

ABSTRACT:
A double-acting rotary drive for a control device having an end position fixed in the form of a stop, includes a motor, a torque-changing gear connected to the motor, a driver associated with the torque-changing gear for neutralizing a torque-increasing action of the torque-changing gear or switching on a torque-lowering action after the torque-changing gear rotates through a portion of a total given rotational path thereof, a return travel lock for locking the torque-changing gear in place being released before the driver becomes operative.

REFERENCES:
patent: 4232567 (1980-11-01), Hobbs
patent: 4563624 (1986-01-01), Yu
patent: 4621789 (1986-11-01), Fukamachi

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