Drive mechanism for drawout high amperage multi-pole circuit bre

Details Drive mechanism for drawout high amperage multi-pole circuit bre Drive mechanism for drawout high amperage multi-pole circuit bre

1986-07-08

1987-09-15

Hermann, Allan D.

Machine element or mechanism

Gearing

Directly cooperating gears

464 39, F16H 116, F16D 704

Patent

active

046931325

ABSTRACT:
An assembly for protecting a circuit breaker drawout mechanism from damage which may be caused if excessive torque is applied to operate the mechanism. The invention relates to drawout circuit breakers of the type utilizing a worm gear assembly (34, 36) to operate a driven shaft (12) to move the circuit breaker into and out of an electrical compartment. A two-part driver shaft assembly (38) is used which includes a head (50) and a driver shaft (62). The head has a collar portion (52) which includes a ridge (54) and the driver shaft is provided with a channel (68) adapted to receive the ridge. A shoulder screw (60) connects the head to the driver shaft while a coil spring (66) encircling the screw biases the head against the driver shaft, retaining the ridge within the channel unless an excessive amount of torque is applied to the head causing the ridge to slip from the channel and preventing additional torque from being imparted to the worm.

REFERENCES:
patent: 681476 (1901-08-01), Flautt
patent: 902527 (1908-10-01), French
patent: 1466148 (1923-08-01), Sands
patent: 1479706 (1924-01-01), Fleischer
patent: 2400712 (1946-05-01), Prather et al.
patent: 2491740 (1949-12-01), Lambach
patent: 2714436 (1955-08-01), Heisler
patent: 4506246 (1985-03-01), Wong

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