Electromotor

Details Electromotor Electromotor

2000-03-13

2001-05-01

Ramirez, Nestor (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S239000, C310S249000

Reexamination Certificate

active

06225717

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electromotor including a stator, a rotor, a commutator fixedly connected with the rotor for joint rotation therewith, two carbon brushes cooperating with the commutator, two brush holders spaced from each other and aligned coaxially relative to each other, and a connection member for connecting the two brush holders and having two connection sections and releasably connectable with the stator, with each brush holder having an end region projecting beyond the carbon brush and with which the brush holder is arranged on the connection section of a connection member that connects the two brush holders.
2. Description of the Prior Act
A drill, which is produced by the assignee of the present invention, includes a rotor, a stator, a commutator fixedly connected with the rotor for joint rotation therewith, and two brush holders in which two carbon brushes, which cooperate with the commutator, are respectively received. Both brush holders are arranged on connection sections of a ring-shaped connection member, with the distance between the brush holders only slightly exceeding the outer diameter of the commutator. Because the carbon brushes project beyond the respective and regions of respective brush holders when the brush holders or the connection member are not mounted, the carbon brushes need be pressed, during mounting of the brush holders or the connection member, with any suitable tool, e.g., a screw driver, into the brush holders against a biasing force of respective springs cooperating with the carbon brushes in order to be able to push the brush holders over the commutator.
Accordingly, an object of the present invention is to provide an electromotor in which both brush holders, together with the carbon brushes can be mounted quickly, simply, and reliably, without the use of any auxiliary tool.
SUMMARY OF THE INVENTION
This and other objects of the present invention, which will become apparent hereinafter, are achieved by providing a connection member for connecting the two brush holders and including an elastic section extending between the connection sections, with each connection section having an attachment point for connecting the connection section with the stator, and with each brush holder having an end region projecting beyond the carbon brush and with which the brush holder is arranged on a respective connection section of the connection member.
The elastic intermediate section of the connection member insures that both brush holders can be moved apart from each other to such an extent that the two brush holders can be easily pushed over the commutator despite the carbon brushes projecting from the respective holders. The attachment points, which are provided on the connection sections and which are formed as through-openings extending parallel to the rotor longitudinal axis, insure that the entire connection member is reliably secured to the stator with the attachment elements screwed into the stator.
Advantageously, the elastic connection section is formed as a U-shaped arch which projects, at its opposite ends, from respective sides of the connection sections remote from the brush holders. By forming the intermediate section as an arch, in particular, having a thin wall, the brush holders can be easily moved apart by a comparatively large distance. This is particularly advantageous when, for reasons of accessibility, the brush holders need be mounted parallel to the rotor longitudinal axis and, therefore, must be pushed over points at the end of the rotor the outer diameter of which is larger than the outer diameter of the commutator.
In order to insure an easy and rapid feeding of a current from a current source to the carbon brushes, which are arranged in the brush holders, e.g., via flat plugs provided on the brush holders, advantageously, each brush holder is provided with two connection lugs formed integrally with the brush holders. The connection lugs project from the sides of the connection sections opposite the brush holders.
The novel features of the present invention, which are considered as characteristic for the invention, are set forth in the appended claims. The invention itself, however, both as to its construction and its mode of operation, together with additional advantages and objects thereof, will be best understood from the following detailed description of preferred embodiment, when read with reference to the accompanying drawings.


REFERENCES:
patent: 3654504 (1972-04-01), Susdorf et al.
patent: 4593200 (1986-06-01), Cousins et al.
patent: 6133665 (2000-10-01), Prell et al.

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