Brush holder

Claim 1

IN AN ELECTRIC MOTOR HAVING A FRAME, SAID FRAME HAVING BRUSH-ACCOMMODATING OPENINGS OF RECTANGULAR CROSSSECTION EXTENDING THERETHROUGH, A COMMUTATOR ROTATABLY CARRIED BY THE FRAME AND POSITIONED INWARDLY FROM SAID BRUSH-ACCOMMODATING OPENINGS, ELECTRICAL CONDUCTORS HAVING SPADE-TYPE TERMINALS OF A SHAPE HAVING A FORWARD END OF SMALLER WIDTH THAN THE REARWARD END, THE TERMINALS BEING ADAPTED TO BE ELECTRICALLY INTERCONNECTED WITH SAID COMMUTATOR, AND BRUSHES ADAPTED TO ENGAGE AND ELECTRICALLY CONNECT WITH SAID COMMUTATOR, THE IMPROVEMENT OF BRUSH HOLDERS FOR CARRYING THE RESPECTIVE BRUSHES IN ENGAGEMENT WITH SAID COMMUTATOR, EACH SAID HOLDER COMPRISING AN OPEN-ENDED TUBULAR STRUCTURE OF RECTANGULAR CROSS-SECTION COMPLEMENTARILY INTERFITTING IN A SAID BRUSHACCOMMODATING OPENING AND HAVING A FIRST PORTION EXTENDING FROM AN INNER SIDE OF THE FRAME TOWARD THE COMMUTATOR AND HAVING A SECOND PORTION EXTENDING FROM AN OUTER SIDE OF THE FRAME AWAY FROM THE COMMUTATOR, SAID HOLDER ON OPPOSITE SIDES OF SAID FIRST PORTION THEREOF HAVING PROJECTIONS EXTENDING OUTWARDLY FROM THE PLANES OF SAID OPPOSITE SIDES A GREATER DISTANCE THAN THE CORRESPONDING SIDES OF SAID OPENING TO ENGAGE ON SAID INNER SIDE OF THE FRAME AND PREVENT WITHDRAWAL OF THE HOLDER OUTWARDLY FROM THE FRAME AWAY FROM THE SAID COMMUTATOR, SAID PROJECTIONS EACH HAVING AN INCLINED CAMMING SURFACE EXTENDING FROM THE PLANE OF THE RESPECTIVE SIDE OF THE STRUCTURE ADJACENT THE INNER END OF SAID FIRST PORTION TO THE MAXIMUM EXTENT OF SAID EACH PROJECTION TO CAMMINGLY LEAD THE SAID PROJECTION INTO A SAID OPENING UPON PRESSING THE SAID FIRST PORTION OF STRUCTURE INTO THE OPENING TOWARD SAID COMMUTATOR, SAID STRUCTURE BEING COMPOSED OF A RESILIENTLY YIELDABLE MATERIAL OF THE ORDER OF NYLON AND LEXAN TO PERMIT THE STRUCTURE TO RESILIENTLY YIELD IN PRESSING THE SAID FIRST PORTION CARRYING SAID PROJECTION INTO SAID OPENING, SAID MATERIAL BEING OF HIGH ELECTRICAL INSULATING PROPERTY TO INSULATE THE BRUSH FROM THE FRAME, SAID STRUCTURE HAVING A BOSS EXTENDING FROM A SIDE THEREOF, THE BOSS HAVING A SHOULDER SPACED FROM SAID INNER SIDE OF THE FRAME AND ABUTTING SAID FRAME ON THE OUTER SIDE THEREOF TO PREVENT FURTHER MOVEMENT OF SAID STRUCTURE THROUGH THE OPENING TOWARD THE COMMUTATOR, SAID STRUCTURE THROUGH THE TENDING THROUGH OPPOSITE SIDES THEREOF ADJACENT THE OUTER END OF SAID SECOND PORTION ALIGNED OPEN SPACES FOR RECEIVING A SAID SPADE TERMINAL EXTENDING THROUGH THE OPEN SPACES TRANSVERSELY OF THE STRUCTURE, ONE OF SAID OPEN SPACES BEING SHORTER THAN THE OTHER AND SNUGLY ENGAGING THE SMALLER FORWARD END OF THE SPADE TERMINAL AND THE OTHER OF SAID OPEN SPACES SNUGLY ENGAGING THE LARGER REARWARD END OF THE SPADE TERMINAL, THE MATERIAL OF THE STRUCTURE RESILIENTLY YIELDING TO PERMIT INSERTION OF THE SPADE TERMINAL INTO SAID ALIGNED OPEN SPACES AND TO RESTRAIN THE SPADE TERMINAL AGAINST WITHDRAWAL FROM THE ALIGNED OPEN SPACES, SAID HOLDER HAVING A BORE FOR ACCOMMODATING AN AXIALLY ALIGNED ELECTRIC BRUSH THEREIN IN SLIDING ENGAGEMENT WITH THE INNER WALLS OF THE HOLDER AND FOR PERMITTING THE BRUSH TO EXTEND AXIALLY OF THE HOLDER FROM THE HOLDER TOWARD AND AGAINST THE COMMUTATOR, SAID BORE ALSO ACCOMMODATING A METAL COIL SPRING THEREIN BETWEEN, AND IN ENGAGEMENT WITH, SAID BRUSH AND SAID SPADE TERMINAL IN SAID ALIGNED OPEN SPACES, THE COIL SPRING RESILIENTLY BIASING THE BRUSH TOWARD THE ARMATURE AND PROVIDING ELECTRICAL CONNECTION BETWEEN THE BRUSH AND SPADE TERMINAL.