Brush holder for an electric motor
First Claim
1. A brush holder subassembly for an electric motor, the motor having an axis of rotation and including a motor housing and a plurality of motor elements including at least one field winding and a switch, comprising:
- an insulator including a body having a through bore and a support element disposed externally of the body; and
a brush holder of conductive material, including a sleeve portion for slidably receiving a brush, housed in fixed position in the bore of the insulator body, and an integral elongated terminal portion fixedly connected to the sleeve portion, disposed externally of the insulator body and extending perpendicular to the longitudinal axis of the insulator body bore and including a free connecting end for electrical connection to one of the motor elements, and an opposite support end for engaging the support element of the insulator so as to stabilize the disposition of the terminal portion relative to the sleeve portion.
1 Assignment
0 Petitions
Accused Products
Abstract
In a unitary bifurcated brush holder for a small electric motor, a pair of coplanar terminal tabs, each axially spaced and laterally offset from the brush holder sleeve, extend axially of the motor for direct plug-in engagement, in assembly operation, with terminals at the commutator end of a stator assembly. The brush holder is made from a single sheet metal stamping. The terminal tabs are carried at the end of a support arm extending from a wall of the brush holder sleeve. In assembly, the brush holder is mounted in an insulator which includes support bosses for engaging and augmenting the support of the rear end of the terminal tabs.
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Citations
26 Claims
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1. A brush holder subassembly for an electric motor, the motor having an axis of rotation and including a motor housing and a plurality of motor elements including at least one field winding and a switch, comprising:
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an insulator including a body having a through bore and a support element disposed externally of the body; and a brush holder of conductive material, including a sleeve portion for slidably receiving a brush, housed in fixed position in the bore of the insulator body, and an integral elongated terminal portion fixedly connected to the sleeve portion, disposed externally of the insulator body and extending perpendicular to the longitudinal axis of the insulator body bore and including a free connecting end for electrical connection to one of the motor elements, and an opposite support end for engaging the support element of the insulator so as to stabilize the disposition of the terminal portion relative to the sleeve portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A unitary brush holder for an electric motor comprising:
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an elongated sleeve for slidably receiving a brush, the sleeve having a plurality of side walls and a longitudinal axis; a first elongated terminal tab having a free connecting end and an opposite support end, spaced from the sleeve walls and offset with respect to the sleeve axis and extending in a plane perpendicular to the sleeve longitudinal axis; and a support arm for carrying the terminal tab, extending cantilever fashion from one of the sleeve walls to the support end of the terminal tab. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A unitary brush holder for use with an electric motor, the motor having an armature with a commutator and a field substantially surrounding the armature, and a pair of brushes for maintaining electrical contact with the commutator and the motor having a wiring circuit schematic including two electrical connections to each brush, comprising:
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an elongated sleeve for slidably receiving a brush and having side walls; a pair of spaced apart elongated terminal tabs extending parallel to the axis of the armature and in a plane perpendicular to the axis of the sleeve, and spaced from the sleeve; and a support arm for carrying the terminal tabs, extending cantilever fashion from a wall of the sleeve. - View Dependent Claims (21, 22)
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23. A small electric motor for use in portable tools and appliances, comprising:
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an armature having a commutator; a stator assembly substantially enclosing the armature and including a plurality of field windings and having opposite ends including a commutator end adjacent the commutator; at least one pair of spaced apart terminal elements carried by the stator commutator end, and facing axially outwards with respect to said end, and connected electrically to the field windings; a pair of diametrically opposed radially extending brushes for maintaining electrical contact with the commutator; and a first unitary brush holder having a sleeve for slidably supporting one of the brushes and including a pair of axially extending terminal tabs, spaced apart and integral with but remote from the sleeve, and registering with the terminal elements of the stator so as to directly electrically connect the brush holder with the field windings and complete electrical connection between the armature and the field windings. - View Dependent Claims (24, 25, 26)
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Specification