Information
-
Patent Grant
-
6273766
-
Patent Number
6,273,766
-
Date Filed
Friday, September 8, 200024 years ago
-
Date Issued
Tuesday, August 14, 200123 years ago
-
Inventors
-
Original Assignees
-
Examiners
- Sircus; Brian
- Dinh; Phuong K T
Agents
-
CPC
-
US Classifications
Field of Search
US
- 439 843
- 439 441
- 439 439
- 439 891
- 439 761
-
International Classifications
-
Abstract
An electronic device of the type including a threaded female connector adapted to mate with a cable connector including a housing, a female connector extending from the housing, and a circuit board positioned within said housing and having a first presoldered conductor wire extending therefrom toward the female connector. The electronic device further includes a collet assembly positioned within a bore of the threaded female connector, wherein the collet assembly comprises a generally cylindrical insulating body having a first end and an opposed second end, an electrically conductive collet contact passing through the insulating body and having a first end proximate the first end of the insulating body and a second end proximate the second end of the insulating body. The first end of the collet contact includes a first gripping member for gripping an external conductor wire introduced into the female connector bore, and the second end of the collet contact includes a second gripping member for gripping the first presoldered conductor wire.
Description
FIELD OF THE INVENTION
The present invention relates to an electronic device, including a collet assembly having an improved mechanical connection mechanism for receiving electrical conductor wires.
BACKGROUND OF THE INVENTION
The manufacture of electronic devices such as electronic filters, involves mass production assembly of a number of separate components. An example of such an electronic filter is disclosed in U.S. Pat. No. 5,662,494, the entirety of which is incorporated by reference herein. The '494 filter housing
1
shown in
FIG. 1
includes a female connector bore
2
, a pre-assembled collet assembly
3
positioned within the bore and having collet contact
4
extending from the collet assembly. The collet contact is secured to a circuit board
5
having discrete electronic components
6
A-
6
D. A conductor wire
7
is secured to the circuit board and extends from the circuit board through a male connector end
8
of the housing.
The filter is assembled using a multi-step process, comprising both efficient and inefficient assembly techniques. The discrete electronic components
6
A-
6
D and the conductor wire
7
are wave soldered to the circuit board
5
contemporaneously in their respective positions. This portion of the manufacturing process is highly efficient, as it is fully automated.
In order to complete the circuit board assembly of
FIG. 1
, the collet contact
4
, which is an integral part of the collet assembly, must also be soldered to the circuit board. The collet assembly
3
is a prefabricated unit from which the integrated collet contact
4
extends. Securing the collet contact
4
to the circuit board
5
requires a separate, hand-soldering step, because the heat generated during wave soldering would melt the plastic components of the collet assembly. This step is both inefficient and costly.
Although the overall structure of the filter in
FIG. 1
is relatively simple and inexpensive to manufacture and assemble, the requisite hand-soldering step to secure the collet contact to the circuit board creates an additional, inefficient manual step. The need for such an extra, manual manufacturing step limits the speed and efficiency of the process technique, and increases the costs associated with the manufacture of electronic devices of this nature.
It would be desirable to provide an electronic device with a collet assembly to be mated with a circuit board which does not necessitate the extra, inefficient manual step required in the conventional manufacturing technique described above. It would also be desirable to increase production speed and efficiency, and decrease overall production costs by achieving more efficient automated assembly of the circuit board.
SUMMARY OF THE INVENTION
It is an object of the present invention to overcome the drawbacks of the prior art, particularly to provide an electronic device having a collet assembly that can be secured to a circuit board without a separate, manual soldering step during assembly of the electronic device.
In accordance with a first embodiment of the present invention, an electronic device of the type including a threaded female connector adapted to mate with a cable connector is provided that includes a housing and a female connector bore extending from the housing. The filter also includes a circuit board which is positioned within the housing and has a first presoldered conductor wire extending therefrom toward the female connector bore.
The device of this preferred embodiment further includes a collet assembly which is positioned within the female connector bore and includes a generally cylindrical insulating body extending along a longitudinal direction from a first end thereof to an opposed second end thereof. The collet assembly also includes a collet contact which passes through the insulating body, and has a first end proximate to the first end of the insulating body and a second end proximate to the second end of the insulating body. The collet assembly further includes a first gripping member for gripping an external conductor wire introduced into the female connector bore, and a second gripping member for gripping a first presoldered conductor wire extending from the first end of the circuit board.
Since the second female socket receives the first presoldered conductor wire that extends from the circuit board, the first presoldered conductor wire can be wave soldered onto the circuit board along with the discrete electronic components and the second conductor wire in an automated manufacturing step. The first presoldered conductor wire can then be mechanically inserted into the second female socket of the collet contact. This eliminates the need for a separate hand-soldering step in the assembly of the electronic device.
In accordance with a preferred embodiment of the present invention, the first gripping member of the collet assembly is defined by a first female socket secured within the first end of the collet contact. More preferably, the first female socket comprises a band member having contact fingers extending therefrom in a longitudinal direction of the collet contact. The second gripping member is also preferably a second female socket secured within the second end of the collet contact. More preferably, the second female socket comprises a band member having contact fingers extending therefrom in a longitudinal direction of the collet contact.
As an alternative, one or both gripping members could be formed integrally with he collet contact in the form of an axially split and radially compressed bore.
In accordance with another preferred embodiment of the present invention, the insulating body of the collet assembly includes a front insulator having inner and outer surfaces, and a rear insulator having inner and outer surfaces. More preferably, the rear insulator of the collet assembly further includes a first section having a first diameter, and a second section having a second diameter, wherein a portion of the first section of the rear insulator extends within the front insulator.
It is also preferred that the front insulator of the collet assembly has a cylindrical sidewall having inner and outer surfaces and an end wall substantially enclosing one end of the front insulator, wherein the portion of the first section of the rear insulator is surrounded by the sidewall of the front insulator. More preferably, the front insulator further includes a plurality of longitudinally extending ridges on the inner surface of the sidewall providing contact with the first section of the rear insulator.
BRIEF DESCRIPTION OF THE DRAWINGS
For a fuller understanding of the nature and objects of the invention, reference should be made to the following detailed description of a preferred mode of practicing the invention, read in connection with the accompanying drawings, in which:
FIG. 1
is a cross sectional view of a prior art filter;
FIG. 2
is a cross sectional view of a collet assembly in accordance with one embodiment of the present invention;
FIG. 3
is a cross sectional view of the collet contact of
FIG. 2
before the first and second female sockets are press fit therein;
FIG. 4A
is a view showing the stamped band member and contact fingers before rolling to form the cylindrical configuration of the first female socket as depicted in
FIG. 2
;
FIG. 4B
is a view of the band member and contact fingers of the first female socket after rolling to form a generally cylindrical configuration and before being press fit into the first bore of the collet contact;
FIG. 5A
is a view showing the stamped band member and contact fingers before rolling to form the cylindrical configuration of the second female socket as depicted in
FIG. 2
;
FIG. 5B
is a view of the stamped band member and contact fingers of the second female socket after rolling to form a generally cylindrical configuration and before being press fit into the second bore of the collet contact;
FIG. 6A
is a cross sectional view of the front insulator of
FIG. 2
;
FIG. 6B
is a plan view of the open end of the front insulator of
FIG. 2
;
FIG. 7A
is a plan view of a collet contact in accordance with another embodiment of the present invention;
FIG. 7B
is an end view of an extended collet contact forming a female socket in accordance with another embodiment of the present invention; and
FIG. 8
is a partial exploded view showing the assembly of the circuit board and the collet assembly of the present invention within a housing for an electronic device.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 2
is a cross sectional view of a collet assembly
100
in accordance with one embodiment of the present invention. The collet assembly
100
includes a front insulator
10
having a generally cylindrical sidewall
11
and an end wall
12
substantially enclosing one end of the front insulator
10
. The end wall
12
includes a guide hole
13
through which a center conductor of a cable may be introduced into the collet assembly. The collet assembly
100
also includes a rear insulator
20
, which is generally cylindrical in shape having a first section
21
having a first diameter, a second section
22
having a second diameter, and a third section
23
having a third diameter. The first section
21
of the rear insulator
20
is surrounded by the front insulator
10
and is in contact with inner ridges
14
extending longitudinally along the inner surface of sidewall
11
of the front insulator
10
. The second section
22
of the rear insulator
20
is proximate to the second end of the collet contact
30
. The third section
23
of the rear insulator
20
is positioned between the first section
21
and the second section
22
.The front insulator
10
is made from an electrically insulating material, one example of which is polypropylene. The rear insulator
20
is also made from an insulating material, one example of which is polypropylene.
An elastomer seal
60
is seated on the outer surface of the rear insulator
20
at the third section
23
and forms a surface compression seal as described in commonly owned U.S. Pat. No. 5,662,494 incorporated by reference herein. The elastomer seal
60
is made from an elastomer material, one example of which is rubber.
The collet assembly
100
also includes a collet contact
30
extending longitudinally from the front insulator
10
toward the rear insulator
20
. The collet contact
30
is made from an electrically conductive material, one example of which is brass.
A first female socket
40
is press fit within the collet contact
30
proximate to the front insulator
10
and extends longitudinally toward the rear insulator
20
. The first female socket
40
comprises a generally circular band member
45
(
FIG. 4A
) from which a plurality of contact fingers
42
A-D extend cylindrically and longitudinally within collet contact
30
. The contact fingers
42
A-D are bent inward to provide an elongated surface for contact with a conductor wire to be received therein, and to provide two points of contact between the contact fingers
42
A-D and the collet contact
30
. The contact fingers
42
A-D of the first female socket
40
are made from an electrically conductive material, one example of which is beryllium copper.
A second female socket
50
is press fit within the collet contact
30
proximate to the end of the rear insulator
20
and extends longitudinally toward the front insulator
10
. The second female socket
50
comprises a generally circular band member
55
(
FIG. 5A
) from which a plurality of contact fingers
52
A-D extend cylindrically and longitudinally within collet contact
30
. The contact fingers
52
A-D of the second female socket
50
are bent to taper inwardly along the length of the fingers to provide an elongated surface for contact with a conductor wire to be introduced therein. The contact fingers
52
A-D of the second female socket
50
are made from an electrically conductive material, an example of which is phosphor bronze.
The collet assembly
100
of the present invention may be appreciated in conjunction with the prior art filter of the '494 patent shown in FIG.
1
. Because of the placement of the second female socket
50
, the overall length of the collet assembly
100
may be longer than the collet assembly
3
in FIG.
1
. To accommodate the longer collet assembly
100
, the female connector bore
2
of the filter housing
1
may be longer as well. The increased length of the female connector bore
2
also accommodates placement of an integral fastening device on the outside surface of the connector bore
2
as shown and described in co-pending U.S. patent application Ser. No. 09/641,989, entitled Electrical Signal Filter Housing With Hexagonal Drive Section, filed Aug. 18, 2000.
FIG. 3
is a cross sectional view of the collet contact
30
of
FIG. 2
before the first female socket
40
and the second female socket
50
are press fit therein. A first bore
40
A is provided for receiving the first female socket
40
. A second bore
50
A is provided for receiving the second female socket
50
.
FIG. 4A
is a view showing a substantially flat stamped piece
49
comprising a band member
45
from which the contact fingers
42
A-D extend. The flat piece
49
is rolled to form the cylindrical configuration of the female socket
40
as depicted in FIG.
2
. The length of the band member
45
must be long enough so that when it is rolled into the generally cylindrical shape of the female socket as shown in
FIG. 4B
, the outer diameter of the rolled band
45
is slightly greater than the inner diameter of the first bore
40
A of the collet contact
30
. This is necessary to facilitate the press fit of the rolled first female socket
40
into the first bore
40
A of the collet contact
30
.
Chamfer sections
44
A and
44
B are cut out on the edge of each of the contact fingers
42
A-D so that when the stamped piece is rolled, the outer profile of each contact finger is generally circular. The stamped piece
49
is made from an electrically conductive, spring tempered material, an example of which is beryllium copper.
FIG. 4B
is a view of the band member
45
and contact fingers
42
A-D of the first female socket
40
of
FIG. 2
after rolling the substantially flat stamped piece
49
of
FIG. 4A
to form a generally cylindrical configuration and before being press fit into the first bore
40
A of the collet contact
30
. The contact fingers
42
A-D are bent inwardly along the length of the fingers such that the cylindrical shape roughly resembles an hour glass and forms a center socket column
46
for receiving a center conductor wire. The inner diameter of the socket column
46
varies along the length of the contact fingers
42
A-D, providing a waist
46
A at the point where the distance between the converging contact fingers
42
A-D is the smallest. The inner diameter of the waist
46
A of the socket column
46
is also less than the outer diameter of the smallest center conductor wire to be received in order to facilitate electrical contact upon insertion of the wire into the socket
40
.
The generally cylindrical, hourglass-like shape of the first female socket
40
provides two points of contact a and b with the collet contact
30
after the socket is press fit within the first bore
40
A. The dual contact points a and b facilitate electronic communication between the collet contact and the center conductor wire. The overall resistance of the collet contact is also reduced by having each finger
42
A-D contact the inner surface of the bore
40
A at points a and b. The support provided by the dual contact points also insures more reliable retention of the mating contact with the incoming conductor wire.
FIG. 5A
is a view showing a substantially flat stamped piece
59
comprising a band member
55
from which the contact fingers
52
A-D extend. The flat piece
59
is rolled to form the cylindrical configuration of the female socket
50
as depicted in FIG.
2
. The length of the band member
55
must be long enough so that when it is rolled into the generally cylindrical shape of the female socket as shown in
FIG. 5B
, the outer diameter of the rolled band
55
is slightly greater than the inner diameter of the second bore
50
A of the collet contact
30
. This is necessary to facilitate the press fit of the rolled second female socket
50
into the second bore SOA of the collet contact
30
.
FIG. 5B
is a view of the band member
55
and contact fingers
52
A-D of the second female socket
50
of
FIG. 2
after rolling the substantially flat stamped piece
59
of
FIG. 5A
to form a generally cylindrical configuration and before being press fit into the second bore
50
A of the collet contact
30
. The contact fingers
52
A-D are bent inwardly along the length of the fingers forming a tapered center socket column
56
for receiving a presoldered conductor wire. The inner diameter of the tapered socket column
56
varies along the length of the contact fingers
52
A-D, providing a point
56
A where the distance between the converging contact fingers
52
A-D is the smallest. The inner diameter of the point
56
A of the socket column
56
is also less than the outer diameter of the smallest presoldered conductor wire to be received in order to facilitate electrical contact upon insertion of the presoldered conductor wire into the socket
50
.
FIG. 6A
is a cross sectional view of the front insulator
10
of FIG.
2
. The front insulator
10
includes a generally cylindrical sidewall
11
and an end wall
12
substantially enclosing one end of the front insulator. The end wall
12
includes a guide hole
13
through which the center conductor of a cable may be introduced into the collet assembly. The front insulator
10
also includes a plurality of inner ridges
14
a-d
extending longitudinally along the inner surface of sidewall
11
.
FIG. 6B
is a plan view of the open end of the front insulator
10
of
FIG. 2
, showing the plurality of ridges
14
a-d
located on the inner surface of sidewall
11
. The guide hole
13
is centered on the end wall
12
.
FIG. 7A
is a plan view and
FIG. 7B
is a bottom view of a collet contact
70
in accordance with another embodiment of the present invention. The collet contact
70
is substantially cylindrical in shape. A first bore
80
is provided for receiving a first female socket, such as the first female socket
40
shown in
FIG. 2. A
second female socket
90
is provided by the elongated contact fingers
71
A-B which are an extension of the collet contact
70
, and which are bent to taper along the length of the contact fingers. The diameter of the female socket
90
decreases along the length of the tapered contact fingers to a neck point
91
. The inner diameter of the neck point
91
is less than the outer diameter of the smallest presoldered conductor wire to be received in order to facilitate electrical contact upon reception of the presoldered conductor wire into the socket
90
. The collet contact
70
of this embodiment of the present invention is made of an electrically conductive material, an example of which includes brass.
FIG. 8
is a partial exploded view showing the assembly of a circuit board
200
and the collet assembly
100
of the present invention within a housing
300
for an electronic device. The conductor wires
210
and
220
are contemporaneously wave soldered to the circuit board unit
200
as described above. The first presoldered conductor wire
210
is inserted into the collet assembly
100
by mechanical insertion into the second female socket
50
shown in FIG.
2
. The collet assembly-circuit board unit
110
is then inserted into the housing
300
such that the collet assembly
100
is positioned within the female connector bore
302
and the circuit board is positioned within the center bore
301
.
While the present invention has been particularly shown and described with reference to the preferred mode as illustrated in the drawings, it will be understood by one skilled in the art that various changes in detail may be effected therein without departing from the spirit and scope of the invention as defined by the claims.
Claims
- 1. An electronic device of the type including a threaded female connector adapted to mate with a cable connector, comprising:a housing; a female connector extending from said housing; a circuit board positioned within said housing and having a first presoldered conductor wire extending therefrom toward said female connector; and a collet assembly positioned within a bore of said female connector, comprising a generally cylindrical insulating body, and having a first end and an opposed second end, an electrically conductive collet contact passing through said insulating body and having a first end proximate said first end of said insulating body and a second end proximate said second end of said insulating body, said first end of said collet contact having a first gripping member for gripping an external conductor wire introduced into said female connector bore, said second end of said collet contact having a second gripping member for gripping said first presoldered conductor wire; wherein said first presoldered conductor wire is supported only by said circuit board and said second gripping member.
- 2. The electronic device of claim 1, wherein said first gripping member comprises a first female socket secured within a bore formed within said first end of said collet contact.
- 3. The electronic device of claim 2, wherein said first female socket of said collet assembly comprises a band member and contact fingers extending from said band member in a longitudinal direction of said collet contact.
- 4. The electronic device of claim 1, wherein said second gripping member comprises a second female socket secured within a bore formed within said second end of said collet contact.
- 5. The electronic device of claim 4, wherein said second female socket of said collet assembly comprises a band member and contact fingers extending from said band member in a longitudinal direction of said collet contact.
- 6. The electronic device of claim 1, wherein said first gripping member is defined by an axially split and radially compressed bore formed within said first end of said collet contact.
- 7. The electronic device of claim 1, wherein said second gripping member is defined by an axially split and radially compressed bore formed within said second end of said collet contact.
- 8. The electronic device of claim 1, wherein said insulating body of said collet assembly comprises a front insulator having, an inner surface and an outer surface, and a rear insulator having an inner surface and an outer surface.
- 9. The electronic device of claim 8, wherein said rear insulator of said collet assembly further comprises a first section having a first diameter and a second section having a second diameter, and wherein a portion of said first section of said rear insulator extends within said front insulator.
- 10. The electronic device of claim 9, wherein said collet assembly further comprises a seal positioned between said first and said second sections of said rear insulator.
- 11. The electronic device of claim 9, wherein said rear insulator of said collet assembly further comprises a third section having a third diameter, positioned between said first section and said second section of said rear insulator.
- 12. The electronic device of claim 11, wherein said collet assembly further comprises a seal seated on the outer surface of said third section of said rear insulator.
- 13. The electronic device of claim 8, wherein said front insulator comprises a cylindrical sidewall having an inner surface and an outer surface, and an end wall substantially enclosing one end of said front insulator, wherein said portion of said first section of said rear insulator is surrounded by said sidewall of said front insulator.
- 14. The electronic device of claim 13, wherein said front insulator further comprises a plurality of longitudinally extending ridges on an inner surface of said sidewall, said ridges contacting said portion of said first section of said rear insulator.
- 15. An electronic device of the type including a threaded female connector adapted to mate with a cable connector, comprising:a housing; a female connector extending from said housing; a circuit board positioned within said housing and having a first presoldered conductor wire extending therefrom toward said female connector; and a collet assembly positioned within a bore of said female connector, comprising a generally cylindrical insulating body, and having a first end positioned entirely within said bore of said female connector and an opposed second end, an electrically conductive collet contact passing through said insulating body and having a first end proximate said first end of said insulating body and a second end proximate said second end of said insulating body, said first end of said collet contact having a first gripping member for gripping an external conductor wire introduced into said female connector bore, said second end of said collet contact having said second gripping member for gripping said first presoldered conductor wire.
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|
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|
5601457 |
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|
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