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US 6,873,083 B2Granted
Double brush assembly
AssigneeJohnson Electric S.A.
InventorsFretrick Siu Kwan Ko, Yiu Leung Man
Life of this patent
Estimating the term…
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.
Claims11
A brush assembly for subfractional horsepower electric motor, comprising:
- first and second brushes;
- guide means for guiding the brushes;
- first and second springs for respectively urging the brushes in one direction under the guidance of the guide means from a first position towards a second position, and
- a changeover mechanism for switching operation from the first brush to the second brush when the first brush reaches the second position, the changeover mechanism including a lever pivotally mounted on a pin located between the brushes so that the second brush is held in the first position against the urgings of the second spring until the first brush reaches the second position.
1 more element
A subfractional horsepower universal motor, comprising:
- a wound stator;
- a wound rotor including a commutator;
- and
- brush gear including two brush assemblies, each brush assembly comprising:
- first and second brushes;
- guide means for guiding the brushes into sliding contact with the commutator;
- first and second springs for respectively urging the first and second brushes towards the commutator under the guidance of the guide means, and
- a changeover mechanism for switching operation from the first brush to the second brush when the first brush has worn a predetermined amount, the changeover mechanism including a lever pivotally mounted on a pin located between the brushes and pivotable between a first position in which the lever holds the second brush in a retracted position against the urgings of the second spring and a second position in which the second brush is released, when the first brush has worn said predetermined amount.
5 more elements
Dependencies are inferred from the claim text.