Abstract: A multi-brush cage assembly for a subfractional horsepower electric motor has two brushes 22, 23 received in separate chambers 24, 25 of the cage and urged by springs 26, 27 towards a commutator 15 of the motor. An L-shaped changeover lever 30 is located on a pivot 33 between the chambers and keeps one brush 23 retracted until the other brush 22 has worn out.

Abstract: A multi-brush cage assembly for a subfractional horsepower electric motor has two brushes 22, 23 received in separate chambers 24, 25 of the cage and urged by springs 26, 27 towards a commutator 15 of the motor. An L-shaped changeover lever 30 is located on a pivot 33 between the chambers and keeps one brush 23 retracted until the other brush 22 has worn out.

Abstract: A dust guard for a universal motor has a body with an aperture for press-fit mounting to a brush holder. A hood extends from the body to give the dust guard a cup-like shape. The edge of the hood is shaped to follow a commutator surface. The hood has a passageway in each lateral side for drawing dust laden air into the flow of cooling air for the motor. Air guides formed on the outside of the dust guard adjacent the exits of the passageways assist in drawing out the dust laden air from the interior of the hood. Oil reservoirs form dust collection sites within the dust guard. The oil reservoirs include recesses filled with closely spaced projections to retain oil in the recesses by capillary action.

Abstract: An anti-reverse rotation device suitable for use with a single phase synchronous motor and the like, has a housing with an inner cavity, a rotatable member in the form of a disk and at least one blocking member. The cavity of the housing is bounded by an inner wall forming a cam surface with at least one abrupt change forming a blocking surface. The blocking member is accommodated within a recess formed in the periphery of the disk and moves along the cam surface as the disk rotates. In the forward direction, the cam surface urges the blocking member into the recess. In the reverse direction, the blocking member becomes jammed between the disk and the blocking surface preventing further rotation in the reverse direction.

Abstract: A coupling device for coupling a rotor and an impeller of an electric pump has a coupler body 41 fixed to a shaft of the rotor and accommodated within a cavity 31 of the impeller 11. The body 41 comprises a cylindrical portion 43 and a flange 42 located at one end of the cylindrical portion 43. The cavity 31 has an inner section 32 accommodating the cylindrical portion 43 of the body and an outer section 33 of larger diameter accommodating the flange 42. The flange 42 has a groove 46 on a surface facing the impeller 11. The impeller has two grooves 36 on a surface confronting the flange, the grooves 36, 46 co-operating to form two arcuate tunnels of circular cross-section. Inside each tunnel is located a spherical ball 50. Rotation of the impeller with respect to the body causes the balls to move along the grooves until at least one tunnel is reduced in length to the diameter of the ball whereby further relative rotation in the same direction between the impeller and coupler body is prevented.