Patent ID: 7923892
Filing Date: 2011-04-12
Classification: G01R,H01H,H01R

Abstract:
1. A switch for a recording circuit used to determine brush wear of an electrical brush comprising: a flag having a first end and a second end defining distal ends of the flag, the flag being mounted on the electrical brush at the first end so as to move in unison with brush wear while being in electrical communication with the electrical brush, the flag further having a piercing feature at the second end; and a contact plate arranged relative to the flag so as to bring the flag in contact with the contact plate at a predetermined brush wear, the contact plate including an inner conductive core encased by a cover forming an outer layer of the contact plate, wherein the piercing feature is configured to penetrate the cover and to contact the conductive core to cause electrically continuous contact between the flag and the contact plate and close the switch.