EP0058582A1

EP0058582A1 - An electrical socket type contact assembly for an electrical connector

Info

Publication number: EP0058582A1
Application number: EP82400088A
Authority: EP
Inventors: Amelia R. Piscitelli; Eric Francis Shepler; David Otis Gallusser; Gilbert Grant Warren; Charles Pitman Fischer; Valentine Joseph Hemmer
Original assignee: Bendix Corp
Current assignee: Bendix Corp
Priority date: 1981-01-26
Filing date: 1982-01-18
Publication date: 1982-08-25
Also published as: JPS57128781U

Abstract

An electrical socket type contact assembly for use in an electrical connector said electrical contact assembly comprising: an inner sleeve (10) stamped in form from a single sheet of metal, said sleeve having a front mating portion (11) and the rear wire receiving portion (12); an intermediate sleeve (20) telescopically and mounted over said inner sleeve (10); and an outer sleeve (30) telescopically mounted on the front portion (21) of said intermediate sleeve (20), said outer sleeve (30) having an enlarged portion (35) that includes a forwardly facing shoulder (36) and a rearwardly facing shoulder (37), said inner sleeve characterized by: a plurality of axially extending fingers (15) in the front mating portion of the sleeve (10), said fingers (15) resiliently deflectable and radial direction and a first layer of gold (16) only on at least a portion of the inner surface of said fingers (15).

Description

This invention relates to electrical connectors and more particularly to the electrical contact assembly in the connector.
Electrical connectors generally comprise a shell or housing; a plurality of contacts, each of which are connected to separate incoming wires; and a dielectric insert assembly for fixedly or removably mounting the electrical contacts in the connector shell. Electrical connectors are utilized in electrical instrumentation to connect together the multiplicity of wires carrying electrical power and signals within and between different electrical instruments making up the system or systems. In the Aerospace field, as electronic systems become more and more complex, they are miniaturized to minimize their weight and size. Hence, the electrical connectors interconnecting the system must also be reduced in size. In some instances, electrical connectors which are no more than a few inches in diameter (called miniature connectors) carry hundreds of electrical contacts which interconnect hundreds of wires. Each of the contacts_ and wires associated with such a connector are quite small 1.25 centimeters long with a diameter of about 0.25 centimeters). The wires which are terminated to these contacts generally have a diameter less than half that size. In an attempt to reduce. the size and cost of connectors, the contacts which formerly were machined are being replaced with less expensive electrical contacts stamped and formed from a sheet of metal. Examples of such stamped and formed contacts may be found in U.S. Patents 4,072,394 entitled "Electrical Contact Assembly" issued February 7, 1978; 4,120,556 entitled "Electrical Contact Assembly" issued October 17, 1978; and 4,136,923 entitled "Unitary Hooded Electrical Contact" issued January 30, 1979. In electrical connectors used in the Aerospace field, it is very important that the contacts be protected from the environment; and that when the electrical contact is mated with another contact that the voltage drop across the mated contacts be as low as possible. In both instances, plating the contact with gold will minimize the resistance drop between contacts and protect the mated contacts from their environment. Presently, stamped and formed contacts are made by stamping the contact from a sheet of metal forming it into the desired shape, heat treating it to obtain the required resiliency, and then plating the entire contact with .630 to 1.25 micrometers of gold. This thickness of gold is required to prevent the gold from wearing off during use which would cause the loss of environmental protection and increase the resistance (voltage drop) between the mated contacts 200-300%. Now, gold has become very expensive thereby raising the cost to manufacture the contacts and connector.

Disclosure of The Invention

This invention provides a socket-type contact for use in an electrical connector that has a low voltage drop when mated with another contact while at the same time utilizing less gold than has been required in the past. The invention is characterized by a band of gold only on the inside portion of the inner surface of the mating fingers of the contact. The invention also provides environmental protection when a second layer of gold less than .254 micrometers is provided over the entire surface of contact.
Accordingly, it is an advantage of this invention to provide a socket-type contact for use in electrical connectors that uses less gold than prior art contacts to achieve the same low voltage drop when mated with another contact.
Another advantage of this, invention is that it provides electrical contacts with environmental protection that is less expensive to manufacture than previous contacts.

Detailed Description Of The Invention

FIGURE 1 illustrates a flat piece of metal stamped to a particular configuration.
FIGURE 2 illustrates the metal of FIGURE 1 formed into a tubular socket contact.
FIGURE 3 is a cross sectional- view of one of the fingers.
FIGURES 4 and 5 illustrates additional sleeves placed over the socket contact shown in FIGURE 2.
FIGURE 6 shows an electrical socket contact embodying the principles of this invention.

Referring now to the drawings, FIGURE 1 illustrates a flat piece of metal that has been stamped from a piece of metal, such as beryllium copper which has been plated with nickel. The flat piece includes a plurality of slots 11 arranged in the rear portion 13 to provide structural uniformity of the metal when a wire is crimped to the finished contact; a plurality of radial grooves 12 for retaining the wire when inserted in the completely formed contact and minimizing axial movement of the wire after crimping; and a pair of fingers 15 at the forward mating portion 15a of the contact. A band of gold 16 is located on one side of the fingers 15. When the contact is completely formed, the band of gold 16 will provide a low resistance contacting surface with a pin-type contact (not shown). A second band of gold 17 may also be placed on one side of the stamping to provide less resistance between the completely formed contact when an incoming wire is crimped to the contact. The gold may be plated onto the nickel coating by mechanical bonding (rolling), electrochemical deposition (the preferred method) or vapor deposition.
FIGURE 2 shows the sheet of metal shown in FIGURE 1 formed into the tubular shape of an inner sleeve for a socket contact. After the inner sleeve has been formed, it is heat treated for two hours and 30 minutes (plus or minutes 15 minutes) in a vacuum furnace at a temperature of 489 degrees centigrade (plus or minus seven degrees). The maximum pressure in the vacuum furnace is 50 microns. Alternately, heat treating may be accomplished by heating to the same temperature (not in a vacuum) but in a reducing atmosphere or in a dry inert atmosphere. The heat treating of the base metal, i.e., beryllium copper hardens the base metal to provide the spring characteristics necessary to make the fingers 15 resiliently and radially deflectable.
FIGURE 3 illustrates a cross section of the gold plated portion of the finger 15. The beryllium copper base metal 14 has a coating of nickel 18, a first coating of gold 16 about .625 to 1.25 micrometers thick, and, if desired for environmental protection, a second coating of gold 19 less than .250 micrometers thick. Accordingly, the thickness of gold, will be the greatest at the point where wear is the greatest, i.e., always more than .625 micrometers at the end portion of the fingers 15 which provides a thickness that will not be worn away in normal use.
FIGURES 4 and 5 illustrates an intermediate sleeve 20 with an enlarged middle portion 25, and an outer sleeve 30 that has an enlarged end portion 35 with a forwardly facing shoulder 36..The enlarged portion 35 and the forward facing shoulder 36 being necessary to retain the contact in an insert (not shown) of a connector. Alternately, as is shown in U.S. patent 4,072,394, separate sleeves may be placed over only the front portion and rear portion of the inner sleeve to provide mechanical strength.
FIGURE 6 illustrates a completed electrical socket-type contact assembly for use in an electrical connector. The intermediate sleeve 20 is telescopically mounted to the inner sleeve 10. A finger 21 is pressed through the inner sleeve 10 to provide a wire inspection hole. The intermediate sleeve 20 includes an enlarged portion 25 in the middle that is used to locate the outer sleeve 30. The outer sleeve 30, which protects the forward mating portion of the inner sleeve 10, is retained on the intermediate sleeve 20 by forming a rear shoulder 37 to captivate the enlarged portion 25 of the intermediate sleeve between shoulders 37 and 36. The rear wire receiving portion 13 of the socket contact assembly may include a second gold band 17 and the slots 11 which assist in providing uniform deformation when a wire (not shown) is inserted into the inner sleeve 10 and crimped to the socket contact assembly.
The forward mating portion 15a of the socket assembly includes the outer sleeve 30 which protects the more fragile resiliently deflectable fingers 15 which are adapted to engage a pin-type contact (not shown) upon mating with another electrical connector assembly.
While a preferred embodiment of this invention has been disclosed, it will be apparent to those skilled in the art that changes may be made to the invention as set forth in the appended claims, and in some instances, certain features of the invention may be used to advantage without corresponding use of other features. For instance, in some applications plating the entire contact with gold for environmental protection may not be necessary and therefore only a single band of gold on the inside portion of the mating fingers would be used. Accordingly, it is intended that the illustrative and descriptive materials herein be used to illustrate the principles of the invention and not to limit the scope thereof.

Claims

1. An electrical socket type contact assembly for use in an electrical connector, said electrical contact assembly comprising: an inner sleeve (10) stamped and formed from a single sheet of metal, said sleeve having a front mating portion (15a), and a rear wire receiving portion (13); an intermediate sleeve (20) telescopically mounted over said inner sleeve (10); and an outer sleeve (30) telescopically mounted on the front portion of said intermediate sleeve (20), said outer sleeve (30) having an enlarged portion (35) that includes a forwardly facing shoulder (36) and a rearwardly facing shoulder (37), said inner sleeve (10) characterized by:

a plurality of axially extending fingers (15) in the front mating portion of the sleeve (10), said fingers (15) resiliently deflectable in a radial direction and a first layer of gold (16) only on at least a portion of the inner surface of said fingers (15).

2. The contact recited in Claim 1 wherein the thickness of the first layer of gold (16) is at least .625 micrometers; and a second layer of gold less than .250 micrometers over the entire inner sleeve.

3. The contact as recited in Claim 1 wherein said first layer of gold comprises a band (16, 19) of gold on the inside surface of said wire receiving portion and a band of gold on the inside surface of said fingers.