Locking device for unipolar breaker

Details Locking device for unipolar breaker Locking device for unipolar breaker

1997-01-14

1998-10-20

Walczak, David J.

Electricity: circuit makers and breakers

Switch activation inhibitor

Actuator blocking device

200 4316, 200 4301, H01H 928

Patent

active

058233210

ABSTRACT:
A locking device for unipolar breaker is remote-controlled: the device surrounds a breaker blade and adds to a pivoting-base of the blade a T-shaped piece which prevents the closing of the blade. The T-shaped piece comprises a wide web and two wedge points. The wide web is of a reversed U-shape comprising wings that are locked together by a latch placed inside one of the wings and operated by a key. The latch cannot be triggered too easily so it will not start by itself. To trigger the latch, a key has to be inserted into a casing located in a wing. This casing holds a disk with scarf-joints while the key has a disk with grooves, the combination of scarf-joints and grooves allowing various combinations. The key is located at the end of a gaff, so that only one user may lock or unlock the switch.

REFERENCES:
patent: 1712856 (1929-05-01), Thullen
patent: 1981353 (1934-11-01), Getchell
patent: 5319618 (1994-06-01), Hutko

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