Dynamo electric machine brush assembly
AssigneeLucas Industries Limited
InventorsAnthony J. Chew, Graham M. Leeder, Thomas W. Pickford
Life of this patent
Estimating the term…
Abstract
A brush assembly comprising an electrically insulating plate having therein an aperture with which communicate first and second slots. The slots each slidably receive a brush and a compression spring acts between the closed end of each of the slots and the respective brush to urge the brush slidably towards the aperture. The brushes and at least one wall of each of the slots are provided with mating surfaces whereby the brush may be latched in a retracted position relative to its respective slot against the action of its respective compression spring.
Claims11
A brush assembly comprising a substantially flat electrically insulating plate having therein an aperture within which, in use, the commutator of an associated dynamo electric machine rotates, first and second closed ended slots in the plate, each slot having a pair of longitudinal edges leading into said aperture, said slots each having an open end communicating with said aperture and extending outwardly from said aperture, first and second brushes slidably received in said first and second slots respectively, and first and second compression springs urging said first and second brushes along the length of their respective slots towards said aperture, each of said brushes being formed on opposite sides with longitudinally extending grooves within which the longitudinal edges of said slots are received slidably to mount said brushes in said slots, said plate end each brush having respective surfaces which are interengageable when the brush is retracted against the action of the respective compression spring and tilted relative to the plate so that mutual engagement of said respective surfaces serves to latch the brush in a retracted position such that the brush will not impede the insertion of a commutator into said aperture.
A brush for use in the brush assembly of a dynamo electric machine, the brush having, in opposite sides thereof, longitudinally extending grooves within which the edges of a respective slot in a brush mounting plate are slidably received, in use, the base wall, or a side wall, of at least one of the grooves being formed with a notch defining a surface of the brush, which surface can, in use, co-operate with a shoulder of the brush mounting plate to hold the brush in a retracted position against the action of a compression spring.
A brush mounting plate for use in a brush assembly, the brush mounting plate being substantially flat and having therein first and second slots closed at one end and open at the other end and communicating with an aperture in the plate, said slots extending outwardly from said aperture, for receiving in a slidable manner first and second brushes, one edge of each of said first and second slots being formed with a V-shaped notch defining within the edge a shoulder for co-operating with a surface of the respective brush, to retain the respective brush in a retracted position against the action of a compression spring.
Dependencies are inferred from the claim text.