CA1113562A - Connection between a brush-type and a pin-type contacts - Google Patents

Connection between a brush-type and a pin-type contacts

Info

Publication number
CA1113562A
CA1113562A CA328,598A CA328598A CA1113562A CA 1113562 A CA1113562 A CA 1113562A CA 328598 A CA328598 A CA 328598A CA 1113562 A CA1113562 A CA 1113562A
Authority
CA
Canada
Prior art keywords
contact
electrical
type
connector
pin
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.)
Expired
Application number
CA328,598A
Other languages
French (fr)
Inventor
Leroy W. Fairbairn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bendix Corp
Original Assignee
Bendix Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bendix Corp filed Critical Bendix Corp
Application granted granted Critical
Publication of CA1113562A publication Critical patent/CA1113562A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02Contact members
    • H01R13/33Contact members made of resilient wire
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/40Securing contact members in or to a base or case; Insulating of contact members
    • H01R13/42Securing in a demountable manner
    • H01R13/424Securing in base or case composed of a plurality of insulating parts having at least one resilient insulating part

Landscapes

  • Connector Housings Or Holding Contact Members (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)

Abstract

ELECTRICAL CONNECTOR ASSEMBLY

ABSTRACT OF THE DISCLOSURE

An electrical connector assembly (10) having two electrical connectors (20,30) each including a housing (21, 31) with electrical contacts (22, 32) mounted in a passage (23, 33). The electrical contacts in one housing are adapted to mate with respective electrical contacts in a second housing to bring the respective electrical conductors (24,34) into electric circuit relationship.
One of the mateable contacts (22) is of the rush type and is adapted to mate with a pin-type contact (32) in the second housing. The pin-type contact has a tapering forward portion rather than a spherical or blunt end.

Description

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CROSS-REFERENCE TO RELATED PATENTS

The present invention is related to an improvement upon United States patent 3,725,844 issued April 3, 1973 to McKeo~n et al. for "Hermaphroditic Electrical Contact", .
assigned to the assignee of the present invention. This patent is hereafter referred to as the "Brush Contact Patent".

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TECHNICAL FIELD

The present invention relates to an improved apparatus for inter-connecting two electrical conductors in electrical circuit relationship, using electrical contacts as terminals for mating. More particularly, the present invention is a modification or a hybrid electri-cal connector assembly wherein one contact is of the brush-contact type described in the Brush Contact Patent and the other contact is a conventional contact, for instance a pin-type contact, preferably having a modified tapering end portion.

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BACKGI~OUND ART

In the prior art, there are numerous examples of electrical connectors of the type wherein a pin-type electrical contact is mated with a socket-type contact.
U.S. Patents 3,221,292 and 4,072,3g4 show two examples o~
such pin and socket contacts for use in electrical con-nectors as mating terminals. Such pin-type and socket-type contacts are relatively simple to manufacture and are made at relatively low manufacturing costs. Such contacts may be mounted through a grommet to provide moisture protection.

It is also know in the art to use two electrical contacts as terminations for electrical conductors, in which each contact includes a plurality or bundle of axially-aligned wires with each wire having angled forward end surface. The mating bundles of axially-aligned wires have been found to be good electrical conductors which provide a low mating force contact in an electrical connector assembly. Electrical contacts of this type are shown in the referenced Brush Contact Patent.

The brush contacts shown in the referenced Brush Contact Patent have the advantage that it has a low mating force and provides a good electrical connection.

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' ~1~35~ 370-77-0180 A brush contact of the type described in the referenced Brush contact Patent has a plurality of axially-aligned wires which extend beyond the end of the sleeve that retains it. Such extension of the aligned wires is normally not a problem, but in some electrical connectors applications, moisture protection is desired.
Such moisture protection is frequently achieved by a rear-mounted grommet. It is also desirable in many instances that the electrical contact be rear-insertable and, therefor, must pass through a grommet, they are susceptiable to damage. Further, the exposed, pointed forward ends of the brush wires may damage rubber webs associated with each of the grommet passages, destroying the moisture protection of the grommet.

Damage to the axially-aligned wires of the brush contact renders the contact less effective in mating and carrying electrical current.

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The present inventlon provides an electrical connector assembly which i9 re]a~ively inexpensive with a low mating force and good e]ectrical connection between a conventional contact (e.g., a pin-type or modified pin-type) and a brush-type electrical contact.
According to the present invention there is provided an electrical connector assembly of the type including two mateable electrical connectors, each having a plurality of electrical contacts mounted therein and positioned to mate with contacts in the other connector, in the present invention each contact of the first connector has a plurality of axially-aligned wires with acutely-angled forward end surfaces. ~ach contact of the second connector is an elongated member having a pin-type forward mating portion so that when the first and second electrical connectors are mated, each of the forward mating portions of the contacts in the second connector extend into the plurality of axially-aligned wires of a respective contact of the first connector.
Advantageously, the diameter of the pin-type contact has a predetermined relationship with the diameter of the bundle of brushwires and the wires themselves.
The foregoing and other objects of the present invention will be apparent to those skilled in the art in view of the following description and claims and the accompanying drawingæ.

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BRIEF DESCRIPTION OF THE DRAWINGS

FIGURE 1 is a cross-sectional view of an electrical connector assembly of the present invention.

FIGURE 2 shows the electrical connector assembly of FIGURE 1, also a cutaway view, with the contacts mated, bringing the electrical conductors associated with each contact into electrical circuit relationship.

FIGURE 3 is a cross~sectional view of the brush-type contact used as one of the mating contacts taken along the line 3-3 in FIGURE 1.

FIGURE 4 shows a modified pin-type contact having a tapering end which is preferable in the present invention. -FIGURE 5 shows a pin-type contact having a spherical end of the type used in the prior art.

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9L~13S6z DETAILED DESCRIPTION OF TME DRAWINGS

FIGURE 1 is a cross-sectional view of an electrical connector assembly 10 having electrical contacts 22, 32, mounted in each passage 23, 33, of two electrical connector housings 21, 31.

The electrical connector housing may include (as shown) a shell 21a, an insert 21b including a contact retention system 21c, 21d and a grommet 21e.

The insert 21b may be of the type shown in a U.S.
patent 3,165,369 to Maston for a multi-piece insert including contact retention portions 21c, 21d, of maybe a single piece of molded di-electric material having integral stops 21c and contact retention figers 21d.

The grommet 21e is preferably made of rubber and provides a moisture seal to protect the connection from unwanted moisture which would degrade the electrical connection between the contacts. The moisture seal is obtained by several rubber webs 21f, which are resilient and extend from the grommet 21e.

The grommet 21e and the insert 21b are mounted within the shell 21a in a known manner. As shown in FIGURE 1, the shell 21a may include a rearwardly facing shoulder 21g, with a forwardly facing portion 21g of the insert engaging the shoulder and the forward face 21h of the grommet adjacent to the rear face 21g of the insert.

~ ~ 1 3 56 Z 370-77-0180 An electrical contact 22 is mounted within each passage 23 through the grommet and insert. The contact 22 has an enlarged shoulder which is engaged by the contact retention system 21c, 21d of the insert and is releasable securred within the retention system.

The electrical contact 22 is preferably of the brush-type contact including a plurality of axially-aligned wires 22a each having a acutely-angled forward end surface 22b and being retained rearwardly within a contact sleeve 22c by a crimped portion (not shown).

The pin-type contact 32 is preferably made of a conducting material having a forward end surface 32a which is tapering. The preferred material for the pin-type contact is brass with gold plating.

FIGURE 2 shows a cross-sectional view of the electrical assembly of FIGURE 1 with the pin-type and brush-type contacts mated to bring the associated conductors into electrical circuit relationship.

As shown in FIGURE 3, the axially-aligned wires 22a are arranged in a bundle, which, in the one embodiment shown, includes seven wires. The wires are of a uniform diameter in there embodiment, each of which being 0.008 inches in diameter. Other sizes of wires and number of wires in a bundle might be used to advantage in other applications and, in some applications, the central wire in the bundle might be chosen to have a diameter than that of the surrounding wires.

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~,~ i 3 56 Z 370-77-0180 The brush wires are preferrably each made of beryllium copper, with an external gold plating. The brush wires are straight, to form tight, axially-aligned bundles.

The bundle of wires is held within the contact sleeve 22c having an inner diameter of approximately .040 inches, compared with the outer diameter of the bundle of wires which is approximately .025 inches.

The end surfaces 22b of the axially-aligned wires are preferably cut to have a tapering end portion inclined at approximately a 30 angle from the axis of the wire. In other application, greater or lesser angle may be desirable.

FIGURE 4 shows the preferred embodiment for a pin-type electrical contact 32 of the present invention wherein the forward end surface is tapered to an included angle (shown as ~ in the present view.) While this view shows that the forward end surface tapered to a point, a small blunt or radial portion at the forward end of the pin-type contact could be used to its advantage in place of the point. Also, the double tapering to a point shown in FIGURE 4, is not necessarily required and a single tapering end which extends across, or substantially across the pin forward edge would suffice. The included angle ~ is preferably 60~ or less.

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FIGURE 5 shows a pin-type electrical contact 40 or prior art including a spherical end portion 41. While such pins might be used to mate with electrical contacts of the brush, as advantageous and requires the use of a smaller pin for a given size brush contact to avoid injury to the brush. The smaller pin required with a spherical end portion limits the current-carrying capacity of the assembly and is disadvantageous for that reason in the present invention.

While sizes have been disclosed in the preferred embodiment for a seven-wire bundle, there are numerous changes in the number of the brush wires that are possible and the sizes of pins that can be used to advantage in the present invention. Cther examples of acceptable structure for the present invention include the following:

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TABLE I

CURRENT PIN SLEEVE NO. OF
CAPACITY DIAMETER DIAMETE~ BRUSH
EXAMPLE(AMP)(INCHE5? ¦INCHES~ WIRES

A 3.0 .02S ~044 7 B 7~5 .~3 .062 19 C 13.0 .063 .092 37 BUNDLE RATIO OF RATIO OF
DIAMETER BUNDLE DIAMETER SLEEVE DIAMETER
EXAMPLE (INCHES TO PIN DIAMETER TO PIN DIAMETER

A .n25 1.00 .1.76 ~ .041 .95 1.44 C .058 .92 1.46 Bund].e dia~eter i5 before l~ating , , ~
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~ 562 370-77-0180 Of co~rse, a smaller pin contact could be used with a brush contact of a given size. However, the current rating of the combination would be lower than that of the brush contact and thus there would be unnecessary expense of the larger brush contacts. Conversely, a sma]ler size brush contact could be used with a given size pin contact. However, the expense of a larger-than-necessary pin would be for naught, as the current-carrying capacity of the assembly would be limited by the brush contact.

Other objects and advantages of the present invention will be apparent in those skilled in the art of making electrical connectors in view of the foregoing description. The size of the brush wires, which has been considered as a constant of .008 inches, might be modified to advantage. The material disclosed for the brush wires and the material for the pin can easily be changed without departing from the sprite of the present invention. The foregoing description, accordingly, should be considered illustrative only and should not be interpreted to limit the scope of the present invention which is defined by the following claims.

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Claims (11)

HAVING THUS DESCRIBED THE INVENTION, WHAT IS CLAIMED IS:
1. An electrical connector assembly of the type including two mateable electrical connectors, each having a plurality of electrical contacts mounted therein and positioned to mate with contacts in the other connector, the improvement wherein each contact of the first connector has a plurality of axially-aligned wires with actuately-angled forward end surfaces; and wherein each contact of the second connector is an elongated member having a pin-type forward mating portion whereby, when said first and second electrical connectors are mated, each of the forward mating portions of the contacts in the second connector extend into the plu-rality of axially-aligned wires of a respective contact of the first connector.
2. An electrical connector assembly of the type described in Claim 1 wherein each of the contacts of the second connector have a taper at the mating end.
3. An electrical connector of the type described in Claim 2 wherein a tapering portion terminates in a point.
4. An electrical connector of the type described in Claim 2 wherein the tapered portion has an included angle of 60° or less.
5. An electrical connector assembly of the type described in Claim 1 wherein the largest diameter of the mating portion is in the range of 90% - 100% of the bundle diameter before mating.
6. An electrical connector assembly of the type including two mateable electrical connectors, each including a plurality of removable electrical contacts mounted therein and positioned to mate with respective contacts in the other connector, with at least one of the contacts being releasably mounted in said first connector, said contact including a plurality of fine wires each having a tapered forward end surface and being secured together at the rear, said plurality of wires being in axial alignment while unmated, said contact mating with a pin-type contact having a tapering end portion removably mounted within the other connector, with said wires being urged out of axial alignment with the forward ends pivoting from their secured rear end upon mating and;
whereby when said pin-type contact of said second connector is inserted into the axially aligned wires of said fine wire contact of the first connector, the axially aligned wires are moved radially outward, pivoting from said rear securement and make an electrical connection with the contact of the second connector.
7. An electrical connector assembly of the type described in Claim 6 wherein the contact of the pin-type contact connector has a diameter before mating which is approximately 90 - 100% of the diameter of the plurality of wires before mating.
8. An electrical connector assembly of the type described in Claim 6 wherein the tapering portion of the pin-type contact includes a tapered portion forming approximately a 60° angle.
9. An electrical connector assembly of the type described in Claim 7 wherein the pin includes a tapered end portion and the contact having a plurality of axially aligned wires includes wires having a similar taper on the ends thereof.
10. An electrical connector assembly of the type described in Claim 9 wherein the forward end portion of the pin-type contact has a forward angle which is approximately 60°.
11. An electrical connector assembly for making a moistureproof connection between two electrical conductors, said assembly including:
a first conductor having a first pin-type contact as a termination;
a second conductor including a second contact of the type including a plurality of axially-aligned wires mounted within a tubular holder which extends forwardly of the forward ends of the wires, and;
first and second connectors, each including a forward member with a forward mating face and a rear face, a grommet mounted to the rear face, each forward member and grommet including an aligned passage extending therethrough from front to rear, with the passage including moisture resistant webs in the grommet and means for releasably retaining a
Claim 11....continued.

contact in the forward member, with said first and second contacts being mounted in said passage from the rear through the grommet and engaging said webs to provide a moistureproof connection, with the first and second connectors interfitting when mating, whereby when said first and second contacts are mated in electrical circuit relationship, a moistureproof connection between the first and second conductors is formed.
CA328,598A 1978-07-28 1979-05-29 Connection between a brush-type and a pin-type contacts Expired CA1113562A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US92892378A 1978-07-28 1978-07-28
US928,923 1978-07-28

Publications (1)

Publication Number Publication Date
CA1113562A true CA1113562A (en) 1981-12-01

Family

ID=25457012

Family Applications (1)

Application Number Title Priority Date Filing Date
CA328,598A Expired CA1113562A (en) 1978-07-28 1979-05-29 Connection between a brush-type and a pin-type contacts

Country Status (8)

Country Link
JP (1) JPS5521889A (en)
BR (1) BR7904805A (en)
CA (1) CA1113562A (en)
DE (1) DE2925299A1 (en)
FR (1) FR2432230A1 (en)
GB (1) GB2026786B (en)
IN (1) IN152310B (en)
IT (1) IT1122628B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1149895A (en) * 1980-06-30 1983-07-12 Edward K. Marsh Electrical contact for electrical interconnection
DE3265993D1 (en) * 1981-06-30 1985-10-10 Ibm Electric circuit connecting devices
US4679890A (en) * 1984-06-25 1987-07-14 American Telephone And Telegraph Company, At&T Bell Laboratories Connector contact terminal

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3725844A (en) * 1971-03-15 1973-04-03 Bendix Corp Hermaphroditic electrical contact

Also Published As

Publication number Publication date
FR2432230B1 (en) 1983-10-14
IN152310B (en) 1983-12-17
GB2026786B (en) 1983-02-16
DE2925299A1 (en) 1980-02-14
BR7904805A (en) 1980-04-29
JPS5521889A (en) 1980-02-16
IT1122628B (en) 1986-04-23
GB2026786A (en) 1980-02-06
IT7924479A0 (en) 1979-07-19
FR2432230A1 (en) 1980-02-22

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