US PATENT SUBCLASS 254 / 274
.~.~ Having mechanism, linked to drum or rotating element of drive, for generating control impulse to rotation retarding means or motor when torque on drum varies

Current as of: June, 1999
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254 /   HD   IMPLEMENTS OR APPARATUS FOR APPLYING PUSHING OR PULLING FORCE

264  DF  APPARATUS FOR HAULING OR HOISTING LOAD, INCLUDING DRIVEN DEVICE WHICH CONTACTS AND PULLS ON CABLE {4}
266  DF  .~ Device includes rotatably driven, cable contacting drum {34}
274.~.~ Having mechanism, linked to drum or rotating element of drive, for generating control impulse to rotation retarding means or motor when torque on drum varies {1}
275  DF  .~.~.~> Electricity utilized in transmittal or impulse

DEFINITION

Classification: 254/274

Having mechanism, linked to drum or rotating element of

drive, for generating control impulse to rotation retarding means or motor when torque on drum varies:

(under subclass 266) Apparatus wherein the driven device also includes a mechanism which is either linked to the drum or a rotating element of the drive for the drum and is responsive to variations in the amount of torque on the drum, the mechanism generates a force when the torque is varied, which is transmitted to and regulates the operation of either (a) means which retards the rotation of the drum or (b) a motor which is the source of power for the drive of the drum.

(1) Note. The torque-responsive mechanism of this subclass does not form an active portion of a drive train used in transmitting power from the motor to the drum.

(2) Note. The torque-responsive mechanism of this subclass is not located internally of the motor.

SEE OR SEARCH CLASS

318, Electricity: Motive Power Systems,

6, for an electric motor having a tension maintaining type of motor control.