US 5,057,806 A · Crossbar assembly

Abstract

A crossbar assembly is formed from an elongated metal bar. A pair of contact arm carriers are slid onto the metal bar and welded in place. Molded electrically insulated sleeves are sliding received at each of the crossbar. The insulated sleeves can be either molded directly on the crossbar or molded separately, in which case, the sleeves are glued with epoxy and pinned to the crossbar to prevent axial movement of the sleeves with respect to the crossbar. The insulated sleeves are formed with a pair of plates disposed at each end. A pair of oppositely disposed slots formed in the plates is used to receive the ends of a cam roll pin assembly. Since the crossbar in accordance with the present invention does not require wrapping with insulating paper, the possibility of dielectric failure due to cracking of the insulating paper is eliminated. Also, since the contact arm carriers are welded to the crossbar instead of being stapled, the possibility of axial movement of the contact arm carriers during overcurrent conditions due to loose staples is also eliminated.

Claims14

Dependent claims

A circuit breaker comprising:

a housing;
one or more pairs of separable contacts each including a stationary contact and a movable contact carried by a carrier;
an operating mechanism operatively coupled to contact carrier arms for actuating said movable contacts;
an elongated shaft disposed adjacent said one or more pairs of separable contacts;
a plurality of contact carrier arms rigidly attached to said elongated shaft, disposed adjacent said pairs of separable contacts;
and
a cam roll pin assembly for mechanically coupling said carrier to said contact carrier arms in a first position and allowing the carrier to operate independently of said contact carrier arms in a second position;
and
a pair of insulating sleeves received on the ends of said elongated shaft.

6 more elements

Dependencies are inferred from the claim text.

Crossbar assembly

Life of this patent

Crossbar assembly

Life of this patent

Abstract

Claims14