Contact arm assembly for switchgear circuit breaker having improved cooling fins and contact fingers to maximize heat rejection
First Claim
1. A contact arm assembly for a switchgear circuit breaker comprising:
- a contact arm having a groove in an outer peripheral surface thereof, andat least one contact finger, the contact finger having a body and a ball member extending from the body, the ball member being received in the groove so that the contact finger makes contact with the contact arm,wherein a plurality of heat rejection fins extends from a periphery of the body of the contact finger.
1 Assignment
0 Petitions
Accused Products
Abstract
A contact arm assembly (10) for a switchgear circuit breaker includes a contact arm (11) having a groove (42) in an outer periphery surface thereof. At least one contact finger (13) has a body (38) and a ball member (40) extending from the body. The ball member is received in the groove so that the contact finger makes contact with the contact arm. The contact arm includes a shaft (14) having a longitudinal axis, first and second ends (18, 28), and a constant outside diameter. A plurality of annular rings (16) extends from the outside diameter of the shaft. The rings are spaced along the longitudinal axis to define cooling fins. Diameters of the rings gradually decrease from the first end to generally the center of the shaft, and then gradually increase to the second end of the shaft.
-
Citations
19 Claims
-
1. A contact arm assembly for a switchgear circuit breaker comprising:
-
a contact arm having a groove in an outer peripheral surface thereof, and at least one contact finger, the contact finger having a body and a ball member extending from the body, the ball member being received in the groove so that the contact finger makes contact with the contact arm, wherein a plurality of heat rejection fins extends from a periphery of the body of the contact finger. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A contact arm for a switchgear circuit breaker comprising:
-
a shaft having a longitudinal axis, first and second ends, and a substantially constant outside diameter D, and a plurality of annular rings extending from the outside diameter of the shaft, the rings being spaced along the longitudinal axis to define cooling fins, diameters of the rings gradually decreasing from the first end to generally the center of the shaft, and then gradually increasing to the second end of the shaft. - View Dependent Claims (11, 12, 13, 14)
-
-
15. A method of providing a heat rejecting contact arm assembly for a switch gear circuit breaker, the method comprising the steps of:
-
providing a contact arm having a shaft with a longitudinal axis, the shaft having first and second ends;
a substantially constant outside diameter D;
a plurality of annular rings extending from the outside diameter of the shaft, the rings being spaced along the longitudinal axis to define cooling fins, diameters of the rings gradually decreasing from the first end to generally the center of the shaft, and then gradually increasing to the second end of the shaft; and
a groove in the periphery of the shaft,assembling the contact arm in a bushing structure such that the center of the shaft is disposed generally at an inlet end of the bushing structure, and providing a contact finger having a body and a ball member extending from the body, the ball member being received in the groove so that the contact finger makes contact with the contact arm. - View Dependent Claims (16, 17, 18, 19)
-
Specification