Dynamo-electric machine brush rigging

Claim 1

IN BRUSH RIGGING FOR A DYNAMOELECTRIC MACHINE HAVING A COMMUTATOR AND BRUSH CARD SUPPORT MEANS; A SUBSTANTIALLY FLAT BRUSH CARD COMPRISED OF INSULATING MATERIAL AND HAVING AN OPENING OF A SIZE AND SHAPE TO RECEIVE SAID COMMUTATOR WITH ROTATION CLEARANCE; SAID CARD BEING ADAPTED FOR CONNECTION WITH SAID SUPPORT MEANS TO BE SUPPORTED THEREBY IN A PLANE EXTENDING TRANSVERSE TO THE ROTATION AXIS OF THE COMMUTATOR; SAID CARD HAVING SLOT MEANS IN COMMUNICATION WITH, AND EXTENDING AWAY FROM, SAID OPENING; PORTIONS OF THE CARD ON OPPOSITE SIDES OF SAID SLOT MEANS FORMING A PAIR OF GUIDE ELEMENTS THEREALONG; BRUSH MEANS SLIDABLE IN SAID SLOT MEANS AND HAVING GROOVES IN WHICH SAID GUIDE ELEMENTS ARE RECEIVED; SPRING MEANS ENGAGING SAID BRUSH MEANS FOR PRESSING THE SAME AGAINST SAID COMMUTATOR AND PORTIONS OF THE CARD AT THE OUTER ENDS OF SAID SLOT MEANS FORMING PROJECTION MEANS FOR RETAINING THE OUTER ENDS OF THE SPRING MEANS IN POSITION.