# US 7,612,482 B2 · Electric motor with brush plate

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- Number: US 7,612,482 B2
- Document ID: US7612482B2
- Status: Granted
- Kind: B2
- Application number: 11/523,905
- Filed: 2006-09-19
- Published: 2007-03-22
- Granted: 2009-11-03
- Earliest claimed: 2005-09-20
- Assignees: Hilti Aktiengesellschaft
- Inventors: Helmut Burger; Stefan Aust
- Web page: https://patentgrep.com/patent/US7612482B2

## CPC

- H02K 5/148: {Slidably supported brushes}
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

An electric motor fixedly axially securable in a housing includes a brush plate with a plurality of axially projecting, uniformly circumferentially distributed, convexly shaped, locking segments formed on the brush plate. The brush plate and the locking segments may be formed of an injection-moldable plastic material. The locking segments may be spherically shaped, and the there may be four locking segments. The brush plate may include a plurality of radial, circumferentially distributed, stop surfaces with which are associated a corresponding plurality of radially inwardly projecting radial guides in the housing.

## Claims

### Claim 1

An electric motor fixedly axially secured in a housing (1), comprising:
a brush plate (5) having, as monolithically formed elements thereof, a plurality of locking segments (7), wherein the locking segments (7) are axially projecting, uniformly circumferentially distributed, convexly shaped, locking segments (7) each of which is monolithically formed on the brush plate (5), with each locking segment (7) contacting the housing (1) at a respective initial contact region (10a) of each locking segment (7), and with each initial contact region (10a) having a respective first surface area;
wherein each of the plurality of locking segments (7) responds to pressure on the housing (1) to form a respective pressure contact region (10b) having a second surface area larger than the first surface area.

### Claim 2 (depends on 1)

An electric motor according to claim 1, wherein the brush plate (5) and the locking segments (7) thereof are monolithically formed together from an injection-moldable plastic material.

### Claim 3 (depends on 1)

An electric motor according to claim 1, wherein the plurality of locking segments (7) are spherically shaped locking segments (7), each of which is monolithically formed on the brush plate (5).

### Claim 4 (depends on 1)

An electric motor according to claim 1, wherein the brush plate (5) includes four locking segments (7) as the plurality of locking segments (7) monolithically formed thereof.

### Claim 5 (depends on 1)

An electric motor according to claim 1, wherein the housing (1) includes therein a plurality of radially inwardly projecting radial guides (9); and
wherein the brush plate (5) has a plurality of radial, circumferentially distributed, stop surfaces (8) associated with the corresponding plurality of radially inwardly projecting radial guides (9) provided in the housing (1).