Circuit breaker with unitary actuating shaft

• US 4,412,116 A
• Filed: 05/26/1982
• Issued: 10/25/1983
• Est. Priority Date: 05/26/1982
• Status: Expired due to Fees

• Current Assignee: ABB Power T&D Limited (ABB Limited)
• Original Assignee: Westinghouse Electric Company LLC (Brookfield Asset Management Incorporated)
• Inventors: Golub, Gregory J.
• Primary Examiner(s): Marcus, Stephen
• Assistant Examiner(s): Cusick, Ernest G.
• Application Number:
  US06/382,251
• Time in Patent Office: 517 Days
• Field of Search: 200/63 R, 200/63 A, 200/155 R, 200/259, 200/260, 200/261, 200/293, 200/303, 200/307, 200/336, 200/11 R, 200/11 B, 335/16, 335/195
• US Class Current: 200/571
• CPC Class Codes: H01H 1/365 Bridging contacts
• CPC Class Codes: H01H 1/54 by magnetic force combined with electrodynamic opening H01H77/101
• CPC Class Codes: H01H 19/14 Operating parts, e.g. turn knob
• CPC Class Codes: H01H 33/68 Liquid-break switches, e.g. oil-break

Abstract

A circuit breaker with unitary actuating shaft characterized by a dielectric housing having separable housing sections for mounting opposed stationary contacts; a unitary, hollow actuating shaft for mounting movable contacts between open and closed positions with the opposed stationary contacts; and each section having an end wall with an aperture through which the shaft extends and is retained in alignment.

Claims

1. An electric switch comprising:

a dielectric housing including at least one housing section having side walls and an end wall;

spaced stationary contact structures for each housing section extending through the side walls and into the housing interior;

a dielectric, hollow actuating shaft within the housing with one end of the shaft being journally-mounted in an opening in the end wall and the shaft being rotatable between open and closed circuit positions;

a movable contact structure for each housing section mounted within the shaft and including a pair of parallel conductors having end portions clampingly engaging corresponding stationary contact structures when the shaft is in the closed circuit position;

rotatable driving means for turning the shaft between the open and closed circuit positions;

the shaft having aperture means, and the conductor extending through the aperture means; and

each parallel conductor being mounted within a channel comprising a base and opposite flanges, each flange having notch means for contact with the shaft for preventing longitudinal shifting of the conductor.

2. The switch of claim 1 in which the channels face each other with corresponding flanges extending toward and spaced from each other, and the channels being spaced from each other and being comprised of a ferro-magnetic material, whereby an adductive electromagnetic force occurs between the spaced channels in response to a high surge of current thereby holding the conductors tightly against the stationary contact structures.

3. The switch of claim 2 in which each pair of assembled conductors and channels are biased together to effect greater pressure on the stationary contact structures when in the closed circuit position.

4. The switch of claim 1 in which each housing section comprises first mounting means for supporting each spaced stationary contact structure on each side wall, second mounting means for supporting the movable contact structure, so that the stationary and movable contact structures are bolstered in proper alignment during assembly and operation of the switch.

5. The switch of claim 4 in which the first and second mounting means are spaced from the end wall, and the second mounting means surrounds the actuating shaft.

6. The switch of claim 5 in which each housing section comprises connecting means for adjustably securing adjoining sections together within limited slidable tolerances, the actuating shaft being unitary with the aperture means for each section being spaced along the shaft by distances corresponding to adjustable distances between the mounting means.