Patent ID: 9419501
Filing Date: 2016-08-16
CPC Classification: H01R,H02K

Claim Text:
1. A constant force shaft grounding brush holder configured for placement adjacent to a rotating conductive surface in an electric motor or machine, the brush holder comprising: a brush holder base, wherein the base includes three separate electrically conductive plates defined as a bottom plate, a middle plate, and a top plate; a pair of stanchions extending from the bottom plate through the middle and top plates; a terminal post extending upwardly and outwardly from brush holder base; a brush channel housing extending from the top plate, the brush channel housing having an open end, a pair of symmetrical lateral slots running on each lateral side of the brush channel housing and further having an upper slot running along a top portion of the brush channel housing; a carbon brush housed in the brush channel housing; a shunt wire having a first end secured through the upper slot in the brush channel housing to the carbon brush and further having a second end secured to a female terminal; the female terminal configured to attach to the terminal post; a constant force spring having a pair of coil ends separately secured about the pair of stanchions and further having a spring body extending between the two coil ends, the spring body being positioned through the lateral slots and against the rear end of the carbon brush such that the constant force spring exerts a constant uniform force against the rear end of the brush such that the front end of the brush maintains a constant pressure against the rotating conductive surface, and wherein extraneous electric currents traveling through the rotating conductive surface are removed therefrom by the carbon brush and redirected through the shunt wire emanating from the carbon brush onto the terminal post and harmlessly grounded and dispersed.