Subminiature brush assembly

Claim 1

A BRUSH ASSEMBLY FOR MAKING ELECTRICAL CONTACT WITH A COMMUTATOR SURFACE COMPRISING: A GUIDE MEMBER POSITIONED CLOSELY ADJACENT SAID COMMUTATOR SURFACE AND HAVING A BRUSH-GUIDING APERTURE PERPENDICULAR TO THE COMMUTATOR SURFACE; AN ELONGATED BRUSH OF UNIFORM CROSS-SECTION EXTENDING THROUGH SAID APERTURE WITH A CLOSE SLIDING FIT, AND HAVING ONE END IN ABUTTING RELATION WITH THE COMMUTATOR SURFACE THE LONGITUDINAL EXTENT OF SAID CLOSE SLIDING FIT BETWEEN SAID BRUSH AND SAID APERTURE BEING TOO SHORT TO PREVENT ROCKING MOVEMENT OF SAID BRUSH IN SAID APERTURE; ELONGATED SPRING MEANS ANCHORED AT ONE END TO SAID GUIDE MEMBER AND AT THE OTHER END TO SAID BRUSH AT A POINT THEREON SPACED FROM SAID APERTURE ON THE SIDE THEREOF REMOTE FROM SAID COMMUTATOR; SAID SPRING MEANS HAVING SUBSTANTIAL RESISTANCE TO LATERAL DISPLACEMENT OF ITS SAID OTHER END FOR MAINTAINING SAID BRUSH IN ALIGNMENT WITH SAID APERTURE AND PREVENTING SAID ROCKING MOVEMENT OF SAID BRUSH IN SAID APERTURE, AND HAVING YIELDABLE RESISTANCE TO DISPLACEMENT OF ITS SAID OTHER END AXIALLY AWAY FROM SAID APERTURE TO RESILIENTLY URGE SAID BRUSH AGAINST SAID COMMUTATOR.