Patent ID: 8933609
Filing Date: 2015-01-13
Classification: F04B,H01R,H02K

Abstract:
1. A liquid pump, comprising: a pumping element; an electric motor coupled to the pumping element to drive the pumping element for rotation, the motor having a substantially flat commutator, brushes engaged with the commutator to provide electricity to the commutator and at least one biasing member yieldably biasing the brushes into engagement with the commutator; a brush housing defining brush cavities in which the brushes are slidably received, where the brushes have a first surface engaged with the commutator and a second surface spaced from the first surface and acted upon by said at least one biasing member, and the second surface is inclined at an acute included angle relative to the first surface; and the brushes and brush cavities are generally wedge shaped in cross-section having a narrower first portion and a wider second portion and the second surface is angled so that the brushes move toward the first portion of their respective brush cavities under the force of the biasing member.