TFXHNICAL FIELD
The present subject matter, in general, relates to a brush holding mechanism and in particular, relates to a brush holding mechanism for an electric motor. BACKGROUND
In many engineering applications, it is sometimes necessary to initially keep a part or a component in an extended or in a retracted position. Thereafter, when the need for such an orientation is fuliilled, the orienlalion is subsequently changed to a retracted or an extended position as the case may be. Typically, a mechanism, known as a holding back mechanism, is utilized for the purpose of holding the part or the component in a particular orientation.
For the operation of an electric motor, it is necessary that brushes disposed inside brush boxes remain rcsiliently in contact with a commutator in order to complete the electrical circuit. A spring located inside each of the brush boxes forces the brush to remain in contact with the commutator. The brushes in the brush boxes are generally in their extended positions and protrude outwards. The protruding brushes hamper the assembly of the brush box with the armature. Also, while assembling, the protruding brushes can gel damaged. 1 lence, for convenient and efficient assembly of the brush box with the armature it is necessary that the brushes are kept in a retracted position.
Holding back of the brushes in a retracted position is presently achieved by various components that utilize different types of mechanisms. However, other than holding the brushes back, such components do not have any other utility in the functioning of the electric motor. Hence, after the assembly of the brush box with the armature they are rendered useless.

Thus, there is a need for a holding back mechanism that temporarily holds back the brushes in a retracted position and that may be subsequently removed afterwards so that the holding back mechanism may be used repeatedly. SUMMARY:
The present subject mailer, in general, relates to a brush holding mechanism and in particular relates to a brush holding mechanism for an electric motor. The present subject matter proposes a holding back mechanism that efficiently and cost effectively holds back the brushes in a retracted position such that assembly of the electric motor is accomplished.
In accordance with at least one embodiment of the present subject matter, an electric motor assembly includes a brush box sub assembly. The brush box sub assembly includes a bearing housing and one or more brush boxes disposed on a bottom plate. The bottom plate is clamped onto the bearing housing. A plurality of brushes is resiliently mounted inside the brush box. Further, one or more springs arc disposed inside the brush box such that the springs provide a spring action to the brushes.
The electric motor assembly also includes an armature sub assembly comprising a commutator and a bearing. The bearing is rotatably mounted onto the bearing housing, whereas the brush box sub assembly is operably disposed about the commutator. Further, the electric motor also includes a holding back mechanism. The holding back mechanism comprises one or more holes located on the bearing housing. Also one or more pins are inserted inside the holes such that the pins are dispos-ed substantially perpendicularly with respect to the brushes thereby selectively arresting the brushes in a retracted position,

such that the pins when removed from the holes allow the brushes to resiliency engage with the commmuiator in an extended position.
These and other features, aspects, and advantages of the present subject matter will be better understood with reference to the following description and appended claims. This summary is provided to introduce a selection of concepts in a simplified form. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. BRIEF DESCRIPTION OF THE DRAWINGS:
The above and other features, aspects and advantages of the subject matter will be better understood with regard to the following description, appended claims, and accompanying drawings, where:
FIG.1: shows a perspective view of a brush box sub assembly of an electric motor assembly, according to one embodiment of the present subject matter.
FIG.2: Shows a perspective view of an armature sub assembly of the electric motor assembly.
FIG.3: Shows a perspective view of a bearing housing of the brush box sub assembly shown in FIG.1.
F1G4: Shows a sectional view of the electric motor assembly. DETAILED DESCRIPTION:
The subject matter described herein is directed to a brush holding mechanism for an electric motor assembly. The challenges of efficiently and economically holding back the brushes in a retracted position are achieved by one or more pins that are inserted

inside the holes provided on a bearing housing. The pins are located in a substantially perpendicular orientation to the brushes, thereby selectively arresting the brushes in a retracted position. After the assembly of an armature sub assembly with a brush box sub assembly, these pins are removed from the hoJes, thereby allowing the brushes to resiliency engage with a commutator in an extended position. The removed pins, thereafter, may be reused for holding back of the brushes in other electric motor assemblies.
In accordance with at leas! one embodiment of the present subject matter an electric motor assembly includes a brush box sub assembly. The brush box sub assembly includes a bearing housing and one or more brush boxes disposed on a bottom plate. The bottom plate is clamped on the bearing housing. A plurality of brushes is resiliently mounted inside the brush box. The brushes are preferably made of carbon or any other conducting material. Further, one or more springs are disposed inside the brush box so as to provide spring action to the brushes.
The electric motor assembly also includes an armature sub assembly. The armature sub assembly includes a commutator and a bearing. The brush box sub assembly is opcrably disposed about the commutator whereas the bearing is rotatably mounted onto the bearing housing. Further, the brush box sub assembly also includes a holding back mechanism. The holding back mechanism includes one or more holes located on the bearing housing. Also, onv or more pins are inserted inside the holes such that the pins are substantially perpendicularly disposed to the brushes thereby selectively arresting the brushes in a retracted position. The pins when removed from the holes allow the brushes to resiliently engage with the commmutator in an extended position. Here the

pins can be replaced with screws to hold back the brushes in the retracted position and are preferably removed manually. The electric motor described above is AC or DC operated.
While aspects of the described holding back mechanism can be implemented in any number of different mechanical systems, environments, and/or configurations; embodiments discussed herein are described in the contc.xl of the following exemplary system architecturc(s) method(s) and/or figures.
FIC1 shows a perspective view of a brush box sub assembly of an electric motor assembly, according to one embodiment of the present subject matter.
The brush box sub assembly comprises a bearing housing 100. A bottom plate 102 is clamped onto the bearing housing 100. One or more brush boxes 104 are disposed on the bottom plate 102. The brush boxes 104 are provided with a plurality of brushes 106 and one or more springs. The brushes 106 arc resiliently mounted inside the brush boxes 104 such that the springs disposed inside the brush boxes 104 provide a spring action to the brushes 106. By virtue of the spring action of the disposed springs, the brushes 106 are biased towards an extended position. In one embodiment, the brushes 106 are made up of carbon material that has high electrical conductivity, m another embodiment of the present subject matter the brushes 106 are made up of any other suitable conducting material.
FIG.2 shows a perspective view of an armature sub assembly of the electric motor assembly.
The armature sub assembly comprises a commutator 200 and a bearing 202. The bearing 202 is rotatably mounted onto the bearing housing 100 of the brush box sub

assembly. Further the brush box sub assembly is operably disposed about the commutator 200.
F1G.3 shows a perspective view of the bearing housing 100 of the brush box sub assembly shown in Fid.
One or more holes 300 are provided on the bearing housing 100. Inside the holes 300, one or more pins 302 are inserted such that the pins 302 are substantially perpendicular to the brushes 106 thereby selectively arresting the brushes 106 in a retracted position. For assembling the armature sub assembly with the brush box sub assembly, it is preferred thai the brushes 106 are held back in a retracted position. The protruding brush 106 can hamper the assembly of the electric motor. Also sometimes the protruding brush 106 may gel damaged during the assemblage of electric motor.
For functioning of the electric motor, it is necessary that the commutator 200 and the brushes 106 get engaged and thereby complete the electrical circuit. Thus when the pins 302 are removed from the holes 300, the brushes 106 by virtue of the spring action extend from the retracted position and subsequently get resiliency engaged with the commutator 200. This mechanism of arresting the brushes 106 in a retracted position using the pins 302, so that the armature sub assembly can be efficiently and cost effectively assembled with the brush box sub assembly can be referred to as a holding back mechanism. The pins 302, after removal from the holes 300 in the brush box sub assembly, can be used again in another brush box assembly.
In another embodiment of the present subject matter the pins 302 are replaced with screws to hold back the brushes 106 in the retracted position and can be later

removed manually. Further the electric motor described above can be AC or DC operated.
FIG.4 shows a sectional view of an electric motor assembly.
As shown in FIG.4, the brushes 106 resiliently engage with the commutator 200. Further, a motor plate 402 is fixedly clamped onto one end of the motor assembly, as shown.
The above described versions of the subject mailer and equivalents thereof have many advantages, including those, which are described below. The brushes 106 are held back in the retracted position by one or more pins 302 that are inserted inside the holes 300 located on the bearing housing 100. After the assembly of an armature sub assembly with the brush box sub assembly, the pins 302 arc removed from the holes 300 allowing the brushes 106 to resiliently engage with a commmutator 200 in an extended position. Thereafter pins 302 may be reused in holding back of the brushes in other electric motor assemblies. Thus the challenge of efficiently and economically holding back the brushes 106 is achieved by using reusable pins 302.
Here the applicant intends to encompass within the language any structure presently existing or developed in future that performs the same function.
Although the subject matter has been described in considerable detail with reference to certain preferred embodiments thereof, other embodiments are also possible. As such, the spirit and scope of the appended claims should not be limited to the description of the preferred embodiment contained therein.

We claim:
1. An electric motor assembly comprising:
a brush box sub assembly comprising a bearing housing;
one or more brush boxes disposed on a bottom plate, wherein said bottom plate is clamped on said bearing housing; one or more brushes resiliency mounted inside said brush box; one or more springs disposed inside said brush box such that said spring provides spring action to said brushes;
an armature sub assembly comprising a commutator;
a bearing rotatably mounted onto said bearing housing wherein said brush box sub assembly is operably disposed about said commutator, characterized in that a holding back mechanism comprising
one or more holes located on said bearing housing; one or more pins inserted inside said holes such that said pins are substantially perpendicularly disposed with respect to said brushes thereby selectively arresting said brushes in a retracted position, such that said pins when removed from said holes allow said brushes to resiliently engage with said commmulator in an extended position.

2. The electric motor as claimed in claim I, wherein said electric motor is AC operated.
3. The electric motor as claimed in claim 1, wherein said electric motor is DC operated.
4. The electric motor as claimed in claim 1, wherein said brushes are made of carbon material.
5. The electric motor as claimed in claim 1, wherein pins are manually removable from said holes.
6. The electric motor as claimed in claim 1, wherein said bottom plate is fixedly clamped on said bearing housing through a screw.
7. The electric motor as claimed in claim 1, wherein said brushes are made of a conducting material.