GB2207295A - Varying brush leaf resilience during manufacture - Google Patents
Varying brush leaf resilience during manufacture Download PDFInfo
- Publication number
- GB2207295A GB2207295A GB08717062A GB8717062A GB2207295A GB 2207295 A GB2207295 A GB 2207295A GB 08717062 A GB08717062 A GB 08717062A GB 8717062 A GB8717062 A GB 8717062A GB 2207295 A GB2207295 A GB 2207295A
- Authority
- GB
- United Kingdom
- Prior art keywords
- brush
- leaf
- aperture
- brush leaf
- during manufacture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R39/00—Rotary current collectors, distributors or interrupters
- H01R39/02—Details for dynamo electric machines
- H01R39/38—Brush holders
- H01R39/39—Brush holders wherein the brush is fixedly mounted in the holder
Landscapes
- Motor Or Generator Current Collectors (AREA)
Abstract
An elongate aperture (21) is provided in a brush leaf (10) between a mounting portion (12) and a brush supporting portion (13), the length and/or width of the aperture (21) being selected according to the required resilience of the brush leaf. Thus by changing the size of the aperture it is possible to provide brush leaves which will hold a brush (18) to a commutator with different forces. <IMAGE>
Description
A method of making a brush leaf
This invention relates to a method of making a brush leaf, particularly but not exclusively for use in fractional horsepower permanent magnet direct current electric motors.
It is very common in the manufacture of small p.m.d.c. motors to use an identical motor frame for motors of different performances. Different motor performances require different voltages and different voltages require different brush materials.
Different brush materials require different forces to hold the brushes in contact with the commutator and in the past this has often meant different brush leaf designs to create the different forces.
According to the present invention, there is provided a method of making a brush leaf including the steps of forming an aperture in the brush leaf, and selecting one or more dimensions of the aperture according to a required characteristic of the brush leaf.
Preferably, the brush leaf has a mounting portion at one end and a brush supporting portion at an opposite end and the aperture is formed intermediate the two said ends.
Preferably, the aperture is elongate in a direction parallel to the longitudinal extent of the brush leaf and the length and/or width of the aperture is selected according to the said required characteristic of the brush leaf.
Preferably, the required characteristic is the resilience of the brush leaf.
Thus it is possible to vary the resilience of a brush leaf by changing a punch and die in one station of a leaf forming tool.
The invention also resides in a brush leaf having a mounting portion at one end, a brush supporting portion at an opposite end and an elongate aperture intermediate the two said ends, the resilience of the brush leaf having been determined by the dimensions of said elongate aperture.
The invention will now be more particularly described, by way of example, with reference to the accompanying drawing which is a perspective view of a brush leaf made by a method according to the invention.
Referring now to the drawing, there is shown therein a brush leaf 10 formed of resilient electrically conductive material, e.g. beryllium copper, and a terminal 11 of less resilient electrically conductive material e.g. brass. The brush leaf 10 has a mounting portion 12 at one end and a brush supporting portion 13 at an opposite end. The mounting portion 12 extends at an 'angle, as shown an acute angle, to the rest of the brush leaf and is secured to the terminal 11 by an upset rivet 14.
The brush supporting portion 13 has integral side walls 15 and a rectangular opening 16 for receiving a root 17 of a brush 18. Gripping portions 19 and 20 are bent out of the plane of the plate and extend along opposite edges of the opening 16 to grip the brush 18.
An elongate aperture 21 is provided in the brush leaf 10 intermediate the mounting portion 12 and the brush supporting portion 13, the aperture 21 extending in a direction parallel to the longitudinal extent of the leaf 10. The length of the aperture 21 determines the resilience of the brush leaf 10 and hence the force with which the leaf 10 will hold the brush 18 to a commutator. Thus, if the aperture 21 were to be made longer, as illustrated by the broken line in the drawing, the brush would be held to the commutator with less force.
The terminal 11 is provided with an integral tab 22 which is bent out of the plane of the terminal 11 and which provides a positive fulcrum point for the leaf 10 so as to reduce the spring action of the leaf to a simple cantilever action.
The terminal 11 is supported in conventional manner such as in an aperture or groove in an end cap which closes a drawn can-like casing of a p.m.d.c. micromotor.
The leaf 10 is made, for example, in a multi-station leaf forming tool, it being necessary to change only a punch and die in one station of the tool, in order to change the length of the aperture 21. Hence brush leaves for motors of different performances can be made using virtually the same tool with accompanying cost savings.
The above embodiment is given by way of example only and various modifications will be apparent to persons skilled in the art without departing from the scope of the invention defined by the appended claims. For example, the resilience of the leaf could be varied by changing the width rather than the length of the aperture 21. Alternatively, the width and length of the aperture 21 could be varied.
Claims (7)
1. A method of making a brush leaf including the steps of forming an aperture in the brush leaf, and selecting one or more dimensions of the aperture according to a required characteristic of the brush leaf.
2. A method according to claim 1, wherein the brush leaf has a mounting portion at one end and a brush supporting portion at an opposite end and wherein the aperture is formed intermediate the two said ends.
3. A method according to claim 2, wherein the aperture is elongate in a direction parallel to the longitudinal extent of the brush leaf and wherein the length and/or width of the aperture is selected according to the said required characteristic of the brush leaf.
4. A method according to any one of the preceding claims, wherein the required characteristic is the resilience of the brush leaf.
5. A method of making a brush leaf substantially as hereinbefore described with reference to the accompanying drawing.
6. A brush leaf made according to the method of any one of the preceding claims.
7. A brush leaf having a mounting portion at one end, a brush supporting portion at an opposite end and an elongate aperture intermediate the two said ends, the resilience of the brush leaf having been determined by the dimensions of said elongate aperture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08717062A GB2207295A (en) | 1987-07-20 | 1987-07-20 | Varying brush leaf resilience during manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08717062A GB2207295A (en) | 1987-07-20 | 1987-07-20 | Varying brush leaf resilience during manufacture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8717062D0 GB8717062D0 (en) | 1987-08-26 |
| GB2207295A true GB2207295A (en) | 1989-01-25 |
Family
ID=10620949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08717062A Withdrawn GB2207295A (en) | 1987-07-20 | 1987-07-20 | Varying brush leaf resilience during manufacture |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2207295A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4983872A (en) * | 1988-06-06 | 1991-01-08 | Johnson Electric S.A. | Brush gear for a permanent magnet motor |
| US6603235B1 (en) * | 1999-11-02 | 2003-08-05 | Mabuchi Motor Co. | Small-sized motor having a brush unit with an improved brush arm and terminal connections |
| WO2003100920A1 (en) * | 2002-05-28 | 2003-12-04 | Valeo Motoren Und Aktuatoren Gmbh | Brush or carbon brush for an electric motor and electric motor comprising such a brush |
| EP1808941A1 (en) * | 2006-01-17 | 2007-07-18 | LTN Servotechnik GmbH | Slip ring brush and slip ring device containing it |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB560542A (en) * | ||||
| US4037125A (en) * | 1974-10-11 | 1977-07-19 | Canon Kabushiki Kaisha | Small-sized direct current rotary electric appliance |
| GB2044554A (en) * | 1979-02-19 | 1980-10-15 | Mabuchi Motor Co | Electric motor brushgear |
-
1987
- 1987-07-20 GB GB08717062A patent/GB2207295A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB560542A (en) * | ||||
| US4037125A (en) * | 1974-10-11 | 1977-07-19 | Canon Kabushiki Kaisha | Small-sized direct current rotary electric appliance |
| GB2044554A (en) * | 1979-02-19 | 1980-10-15 | Mabuchi Motor Co | Electric motor brushgear |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4983872A (en) * | 1988-06-06 | 1991-01-08 | Johnson Electric S.A. | Brush gear for a permanent magnet motor |
| US6603235B1 (en) * | 1999-11-02 | 2003-08-05 | Mabuchi Motor Co. | Small-sized motor having a brush unit with an improved brush arm and terminal connections |
| WO2003100920A1 (en) * | 2002-05-28 | 2003-12-04 | Valeo Motoren Und Aktuatoren Gmbh | Brush or carbon brush for an electric motor and electric motor comprising such a brush |
| EP1808941A1 (en) * | 2006-01-17 | 2007-07-18 | LTN Servotechnik GmbH | Slip ring brush and slip ring device containing it |
| US7719158B2 (en) | 2006-01-17 | 2010-05-18 | Ltn Servotechnik Gmbh | Slip-ring brush and slip-ring unit equipped with such a slip-ring brush |
| CN101005185B (en) * | 2006-01-17 | 2011-08-31 | Ltn伺服技术有限责任公司 | Slip-ring brush and slip-ring unit equipped with such a slip-ring brush |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8717062D0 (en) | 1987-08-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |