U.S. patent application number 10/822713 was filed with the patent office on 2005-10-13 for carbon brush holder.
Invention is credited to Liao, Su-Chen, Yu, Meng-Chiu.
Application Number | 20050225196 10/822713 |
Document ID | / |
Family ID | 34992636 |
Filed Date | 2005-10-13 |
United States Patent
Application |
20050225196 |
Kind Code |
A1 |
Liao, Su-Chen ; et
al. |
October 13, 2005 |
CARBON BRUSH HOLDER
Abstract
A carbon brush holder includes a tubular copper conducting
receptacle, a lead wire terminal riveted to the outside wall of the
copper conducting receptacle, and an electrically insulative hollow
holder base holding the copper conducting receptacle, the
electrically insulative hollow holder base having an inside
locating groove, which receives the bottom end of the lead wire
terminal to hold the lead wire terminal in position.
Inventors: |
Liao, Su-Chen; (Taichung,
TW) ; Yu, Meng-Chiu; (Taichung, TW) |
Correspondence
Address: |
BACON & THOMAS, PLLC
625 SLATERS LANE
FOURTH FLOOR
ALEXANDRIA
VA
22314
|
Family ID: |
34992636 |
Appl. No.: |
10/822713 |
Filed: |
April 13, 2004 |
Current U.S.
Class: |
310/245 |
Current CPC
Class: |
H01R 4/06 20130101; H01R
39/383 20130101; H02K 5/148 20130101 |
Class at
Publication: |
310/245 |
International
Class: |
H02K 013/00; H01R
039/38 |
Claims
What is claimed is:
1. A carbon brush holder comprising: an electrically insulative
holder base, said electrically insulative holder base comprising an
upwardly extended vertical receiving hole; a copper conducting
receptacle tightly press-fitted into the vertical receiving hole of
said electrically insulative holder base, said copper conducting
receptacle having a tubular configuration; and a lead wire terminal
riveted to an outside wall of an upper part of said copper
conducting receptacle; wherein said electrically insulative holder
base comprises an inside locating groove upwardly extended to a top
side thereof for the positioning of said lead wire terminal upon
insertion of said copper conducting receptacle into said vertical
receiving hole of said electrically insulative holder base.
2. The carbon brush holder as claimed in claim 1, wherein said lead
wire terminal has a rectangular configuration; said inside locating
groove of said electrically insulative holder base has a
rectangular configuration fitting said lead wire terminal.
3. The carbon brush holder as claimed in claim 1, wherein said lead
wire terminal has a bottom positioning notch; said electrically
insulative holder base comprises an inside locating rod suspended
in said inside locating groove and engaged into said bottom
positioning notch of said lead wire terminal.
4. The carbon brush holder as claimed in claim 1, wherein said
electrically insulative holder base comprises a recessed portion in
said inside locating groove; said lead wire terminal has a bottom
protruding portion engaged into said recessed portion of said
electrically insulative holder base.
5. The carbon brush holder as claimed in claim 1, wherein said
inside locating groove of said electrically insulative holder base
has a bottom end made gradually reduced toward a bottom side; said
lead wire terminal has a pointed bottom end fitting the gradually
reduced bottom end of said inside locating groove.
6. The carbon brush holder as claimed in claim 1, wherein said
electrically insulative holder base has a raised portion suspended
in said inside locating groove; said lead wire terminal has a guide
groove upwardly extended from a bottom end thereof and adapted to
receive said raised portion of said electrically insulative holder
base upon insertion of said lead wire terminal into said inside
locating groove.
7. The carbon brush holder as claimed in claim 1, wherein said lead
wire terminal has a narrow thin-wall portion transversely disposed
on a middle part thereof above the riveted point of said lead wire
terminal to said copper conducting receptacle.
8. The carbon brush holder as claimed in claim 7, wherein said lead
wire terminal has a transverse groove transversely disposed above
the riveted point of said lead wire terminal to said copper
conducting receptacle, defining said thin-wall portion.
9. The carbon brush holder as claimed in claim 1, wherein said lead
wire terminal has two bonding points disposed at two opposite
lateral sides above the riveted point of said lead wire terminal to
said copper conducting receptacle and respectively welded to said
copper conducting receptacle.
10. The carbon brush holder as claimed in claim 1, wherein the
distance between an outer side of said lead wire terminal and an
inner side of said inside locating groove is smaller than 0.1 mm.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to the internal mechanism of a
motor and more particularly, to a carbon brush holder for
motor.
[0003] 2. Description of the Related Art
[0004] Taiwan utility model no. 290200 discloses a carbon brush
holder, which comprises a copper conducting receptacle and a holder
base. The copper conducting receptacle is made from a copper sheet
material by stamping, having an upwardly protruded lead wire
connection strip. The holder base has a vertical receiving hole.
The copper conducting receptacle is fastened to the receiving hole
of the holder base, keeping the lead wire connection strip extended
to the outside of the holder base. Because the copper conducting
receptacle is made from a copper sheet material by stamping, the
wall thickness of the copper conducting receptacle is limited.
Therefore, this design of carbon brush holder is not suitable for
large current application.
[0005] Taiwan utility model no. 292024 discloses another structure
of carbon brush holder. According to this design, the carbon brush
holder comprises a copper conducting receptacle and a holder base
holding the copper conducting receptacle. The copper conducting
receptacle is made from a copper sheet material by stamping, having
a lead wire connection upwardly protruded from the top side and a
locating portion protruded from the outside4 wall. The holder base
has a stop portion for stopping against the locating portion of the
copper conducting receptacle after insertion of the copper
conducting receptacle into the holder base. Similar to the
aforesaid prior art design, this structure of carbon brush holder
is not suitable for large current application.
[0006] FIGS. 11 and 12 show a conventional carbon brush holder 1
that fits for large current application. The carbon brush holder 1
comprises a copper conducting receptacle 2, which is extruded from
copper and has a tubular configuration, a lead wire terminal 3
which is fastened to the top side of the outside wall of the copper
conducting receptacle 2 with a rivet 4 and has a rectangular
configuration, and an electrically insulative holder base 5, which
comprises a upwardly extended vertical receiving hole 6 fitting the
copper conducting receptacle 2. The wall thickness of the copper
conducting receptacle 2 is determined subject to the required large
current load. During actual practice, the upper part of the lead
wire terminal 3 protruding over the top side of the copper
conducting receptacle 2 is bent outwards for the connection of a
lead wire. However, because the lead wire terminal 3 is fastened to
the copper conducting receptacle 2 with a rivet 4, bending the
upper part of the lead wire terminal 3 outwards causes loosening of
the lead wire terminal 3 (see FIG. 12). Loosening of the lead wire
terminal 3 may result in a short circuit.
SUMMARY OF THE INVENTION
[0007] The present invention has been accomplished under the
circumstances in view. It is the main object of the present
invention to provide a carbon brush holder, which keeps the lead
wire terminal positively positioned in position against biasing
force.
[0008] To achieve this and other objects of the present invention,
the carbon brush holder comprises an electrically insulative holder
base, the electrically insulative holder base comprising an
upwardly extended vertical receiving hole; a copper conducting
receptacle tightly press-fitted into the vertical receiving hole of
the electrically insulative holder base, the copper conducting
receptacle having a tubular configuration; and a lead wire terminal
riveted to an outside wall of an upper part of the copper
conducting receptacle; wherein the electrically insulative holder
base comprises an inside locating groove upwardly extended to a top
side thereof for the positioning of the lead wire terminal upon
insertion of the copper conducting receptacle into the vertical
receiving hole of the electrically insulative holder base.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] FIG. 1 is an exploded view of a carbon brush holder
according to a first embodiment of the present invention.
[0010] FIG. 2 is a plain assembly view of the carbon brush holder
according to the first embodiment of the present invention.
[0011] FIG. 3 is a sectional view taken along line 3-3 of FIG.
2.
[0012] FIG. 4 is a plain assembly view of a carbon brush holder
according to a second embodiment of the present invention.
[0013] FIG. 5 is a plain assembly view of a carbon brush holder
according to a third embodiment of the present invention.
[0014] FIG. 6 is a plain assembly view of a carbon brush holder
according to a fourth embodiment of the present invention.
[0015] FIG. 7 is a plain assembly view of a carbon brush holder
according to a fifth embodiment of the present invention.
[0016] FIG. 8 is a perspective assembly view of a carbon brush
holder according to a sixth embodiment of the present
invention.
[0017] FIG. 9 is a perspective assembly view of a carbon brush
holder according to a seventh embodiment of the present
invention.
[0018] FIG. 10 is a plain assembly view of a carbon brush holder
according to an eighth embodiment of the present invention.
[0019] FIG. 11 is an exploded view of a carbon brush holder
according to the prior art.
[0020] FIG. 12 is a plain assembly view of the prior art carbon
brush holder shown in FIG. 11.
DETAILED DESCRIPTION OF THE INVENTION
[0021] Referring to FIG. 1, a carbon brush holder 10 in accordance
with the first embodiment of the present invention is shown
comprising a copper conducting receptacle 20, which is extruded
from copper and has a tubular configuration, a lead wire terminal
30, which is fastened to the top side of the outside wall of the
copper conducting receptacle 20 with a rivet 31 and has a
rectangular configuration, and an electrically insulative holder
base 40 injection-molded from plastics, which comprises a upwardly
extended vertical receiving hole 41 fitting the copper conducting
receptacle 20, and a rectangular locating groove 42 formed inside
the receiving hole 41 and extended to the top.
[0022] The copper conducting receptacle 20 is press-fitted into the
receiving hole 41 of the electrically insulative holder base 40,
keeping the lower part of the lead wire terminal 30 engaged in the
locating groove 42 and the upper part of the lead wire terminal 30
protruding over the topmost edge of the electrically insulative
holder base 40.
[0023] As indicated above, the locating groove 42 holds the lead
wire terminal 30 firmly in place, preventing loosening of the lead
wire terminal 30 from the copper conducting receptacle 20 upon
stretching of the lead wire, which is connected to the lead wire
terminal 30. Therefore, the invention prevents electric shock due
to loosening of the lead wire terminal 30. Further, because the
electrically insulative holder base 40 is injection-molded from
plastics, it is easy to make a cavity in the mold for the locating
groove 42. Therefore, the manufacturing of the carbon brush holder
10 is simple, and its manufacturing cost is low.
[0024] The lead wire terminal and the locating groove may be made
in a different form to have the lead wire terminals positively
secured to the copper conducting receptacle 20.
[0025] In the carbon brush holder, referenced by 50, of the second
embodiment of the present invention as shown in FIG. 4, the lead
wire terminal, referenced by 51, has a bottom positioning notch 52,
and the electrically insulative holder base, referenced by 56, has
an inside locating groove 53 at the top and an inside locating rod
54 suspended in the locating groove 53. Upon insertion of the
copper conducting receptacle, referenced by 55, into the
electrically insulative holder base 56, the lead wire terminal 51
is plugged into the inside locating groove 53 to force the bottom
positioning notch 52 into engagement with the inside locating rod
54.
[0026] In the carbon brush holder, referenced by 60, of the third
embodiment of the present invention as shown in FIG. 5, the lead
wire terminal, referenced by 61, has a bottom protruding portion
62, and the electrically insulative holder base of the carbon brush
holder 60 has an inside locating groove 63 at the top and a
recessed portion 64 in the locating groove 63 for receiving the
bottom protruding portion 62 of the lead wire terminal 61 upon
insertion of the bottom end of the lead wire terminal 61 into the
inside locating groove 63.
[0027] In the carbon brush holder, referenced by 70, of the fourth
embodiment of the present invention as shown in FIG. 6, the lead
wire terminal, referenced by 71, has a pointed bottom end 72, and
the electrically insulative holder base of the carbon brush holder
70 has an inside locating groove 73 with a bottom end 74 made
gradually reduced toward the bottom side to fit the pointed bottom
end 72 of the lead wire terminal 71.
[0028] In the aforesaid embodiments, the bottom end of the lead
wire terminal fits the configuration of the inside locating groove
of the electrically insulative holder base so that the lead wire
terminal can positively be positioned in the inside locating groove
of the electrically insulative holder base.
[0029] In the carbon brush holder, referenced by 80, of the fifth
embodiment of the present invention as shown in FIG. 7, the
electrically insulative holder base of the carbon brush holder 80
has an inside locating groove 81 and a raised portion 82 suspended
in the inside locating groove 81; the lead wire terminal,
referenced by 83, has a guide groove 84 upwardly extended from the
bottom end for receiving the raised portion 82 upon insertion of
the lead wire terminal 83 into the inside locating groove 81.
[0030] In the carbon brush holder, referenced by 90, of the sixth
embodiment of the present invention as shown in FIG. 8, the lead
wire terminal, referenced by 91, is fastened to the copper
conducting receptacle 95 with a rivet 93, having a narrow thin-wall
portion 92 transversely disposed on the middle above the rivet 93.
Making a transverse groove 94 on the lead wire terminal 91 by
stamping forms the thin-wall portion 92. The thin-wall portion 92
stops or reduces transmission of biasing force to the rivet 93 when
the lead wire terminal 91 is bent
[0031] In the carbon brush holder, referenced by 96, of the seventh
embodiment of the present invention as shown in FIG. 9, making a
narrow transverse cut 99 on the lead wire terminal, referenced by
97, forms a thin-wall portion 98 in the lead wire terminal 97. The
narrow transverse cut 99 can be made on either of the two opposite
sides of the lead wire terminal 97.
[0032] In the carbon brush holder, referenced by 100, of the eighth
embodiment of the present invention as shown in FIG. 10, the lead
wire terminal, referenced by 101, is fastened to the copper
conducting receptacle, referenced by 103, with a rivet 102, having
two bonding points 104 disposed at two opposite lateral sides above
the rivet 102 and respectively welded to the copper conducting
receptacle 103. Because the lead wire terminal 101 is welded to the
copper conducting receptacle 103 after having been riveted, the
bonding strength between the lead wire terminal 101 and the copper
conducting receptacle 103 is reinforced, and electric current can
be transmitted to the copper conducting receptacle 103 through the
lead wire terminal 101 stably.
[0033] Further, after the lead wire terminal has been riveted to
the copper conducting receptacle and inserted with the copper
conducting receptacle into the electrically insulative holder base,
the distance between an outer side of said lead wire terminal and
an inner side of said inside locating groove is smaller than 0.1
mm.
[0034] A prototype of carbon brush holder has been constructed with
the features of FIGS. 1-10. The carbon brush holder functions
smoothly to provide all of the features discussed earlier.
[0035] Although particular embodiments of the invention have been
described in detail for purposes of illustration, various
modifications and enhancements may be made without departing from
the spirit and scope of the invention. Accordingly, the invention
is not to be limited except as by the appended claims.
* * * * *