Electric motor with brush card isolated from endframe
First Claim
1. An electric motor comprising:
- a drive shaft,an armature and commutator assembly fixed on said drive shaft,a metal housing disposed around an armature portion of said assembly,permanent magnet means disposed between said armature portion and said housing,an endframe fixed to said housing, anda discrete brush card mounted in said endframe, said brush card havinga cylindrical portion for retaining a commutator portion of said assembly, andbrush tubes extending radially outwardly from said cylindrical portion, said brush tubes being adapted to retain brushes for engaging said commutator portion, and brush springs for urging said brushes into engagement with said commutator portion,said brush card having thereon tab portions with orifices therethrough and grommets mounted thereon, said grommets having openings extending therethrough and aligned, respectively, with said orifices,said endframe having posts extending from an end wall thereof,said grommet openings being configured to each receive one of said posts to lock said grommet onto said post, said grommets being at least in part disposed between said brush card and said endframe end wall to isolate said brush card from said endframe end wall.
21 Assignments
0 Petitions
Accused Products
Abstract
There is presented an electric motor having a drive shaft, an armature and commutator fixed on the drive shaft, a metal housing disposed around the armature, permanent magnets disposed between the armature and the housing, and an endframe fixed to the housing. A discrete brush card is fixed to the housing and has a central cylindrical portion for retaining the commutator, and brush tubes extending radially from the central portion. The brush tubes are adapted to retain brushes and brush springs for urging the brushes into engagement with the commutator. The brush card is provided with tab portions having orifices therethrough and elastomeric grommets mounted thereon, the grommets having openings extending therethrough and aligned with the tab orifices. The endframe is provided with posts extending from an end wall thereof. The grommet openings are configured to receive, respectively, the posts to lock the grommets onto the posts. The grommets are at least in part disposed between the brush card and the endframe end wall to isolate the brush card from the endframe end wall.
43 Citations
12 Claims
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1. An electric motor comprising:
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a drive shaft, an armature and commutator assembly fixed on said drive shaft, a metal housing disposed around an armature portion of said assembly, permanent magnet means disposed between said armature portion and said housing, an endframe fixed to said housing, and a discrete brush card mounted in said endframe, said brush card having a cylindrical portion for retaining a commutator portion of said assembly, and brush tubes extending radially outwardly from said cylindrical portion, said brush tubes being adapted to retain brushes for engaging said commutator portion, and brush springs for urging said brushes into engagement with said commutator portion, said brush card having thereon tab portions with orifices therethrough and grommets mounted thereon, said grommets having openings extending therethrough and aligned, respectively, with said orifices, said endframe having posts extending from an end wall thereof, said grommet openings being configured to each receive one of said posts to lock said grommet onto said post, said grommets being at least in part disposed between said brush card and said endframe end wall to isolate said brush card from said endframe end wall. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A brush card for connection to an endframe of an electric motor, said card comprising:
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a cylindrically-shaped central portion for retaining a commutator portion of said motor, brush tubes extending radially outwardly from said central portion, said brush tubes being configured each to retain a brush, and a brush spring for urging said brush into engagement with said commutator portion, said brush card having thereon tab portions with orifices therethrough, and grommets mounted on said tab portions, said grommets having openings therethrough aligned, respectively, with said orifices, at least a portion of each of said grommets being disposed on a surface of said tab portion adapted to be adjacent a wall of said endframe, whereby to isolate said brush card from said endframe wall upon said connection of said brush card to said endframe. - View Dependent Claims (10, 11, 12)
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Specification