Socket contact for an electrical connector

Abstract: A socket contact for an electrical connector is disclosed which includes a contact body (10), a tubular spring member (28) snapped onto the contact body and a protective sleeve (40) telescopically disposed over the spring member. The contact body includes an annular groove (26) and the spring member (28) includes a plurality of circumferentially spaced tabs (52). The tabs are formed over the groove through the sleeve to prevent axial movement of the spring member relative to the contact body, whereby a highly reliable electrical joint is made between the spring member and the contact body to avoid electrical discontinuities that might otherwise result.

Description: This invention relates to a socket contact for an electrical connector including an arrangement for joining a tubular spring member to the termination end of a machined body. U.S. Patent 4,447,110 issued on May 8, 1984 to Stephen Punako, et al describes a socket contact characterized by a solid machined contact body and a tubular spring member, including means for securing the spring member to the body. A protective sleeve is telescopically mounted over the tubular spring member. In an arrangement of the type described it is imperative, in order to avoid electrical discontinuities, that a highly reliable joint be provided between the spring member and the termination end of the contact body. An arrangement featuring a multi-grooved machined contact body receiving corresponding grooves or threads in a sleeve is described in U.S. Patent 4,461,531 issued on July 24, 1984 to Stephen Punako, et al. A socket contact featuring a crimped construction of the sleeve to the terminal end of the contact body via a groove and formed end is known. In this regard reference is made to U.S. Patent 3,383,645 issued on May 14, 1968 to Milanese, et al and U.S. Patent 3,003,135 issued on October 3, 1961 to Purinton. The use of multiple grooves for joining connector components is shown in other contexts by U.S. Patents 3,291,894 issued on December 13, 1966 and 4,209,221 issued on June 24, 1980 to Sampson and Chupak, et al, respectively. Retention shoulders or tabs and formed sleeve ends for retention are well known as particularly shown by U.S. Patents 4,118,093 and 4,262,987 issued on October 3, 1978 and on April 21, 1981 to Obeissort and Gallusser, et al, respectively. The aforenoted patent to Chupak teaches the combination of a formed groove and end. Socket contacts and/or electrical connectors relating generally to the present invention are shown in U.S. Patent 3,112,149 issued on November 20, 1963 to Bachman; U.S. Patent 3,125,396 issued on March 17, 1964 to Bertram; U.S. Patent 3,544,954 issued on December 1, 1970 to Yeager; U.S. Patent 3,564,487 issued on January 2, 1972 to Upstave, et al; U.S. Patent 3,597,711 issued on August 3, 1971 to Buckley, et al; U.S. Patent 4,264,116 issued on April 28, 1981 to Gliha, Jr.; U.S. Patent 4,270,825 issued on June 2, 1981 to Marsh; U.S. Patent 4,272,150 issued on June 9, 1981 to Faerborin; and U.S. Patent 4,278,317 issued on July 14, 1981 to Gallusser, et al. None of the above cited references are seen to teach or suggest the arrangement of the present invention which features a single interfitted groove combined with formed tabs for the purposes intended. SUMMARY OF THE INVENTION This invention contemplates a socket contact as defined in claim 1 and a method for providing such a socket contact, as defined in claim 6. A highly reliable joint is made between the spring member and the contact body to avoid electrical discontinuities that might otherwise result. BRIEF DESCRIPTION OF THE DRAWING Figure 1 is a partially sectional view of a socket body component formed according to the teachings of the present invention. Figure 2 is a partially sectional view of a tubular spring member formed according to the teachings of the present invention. Figure 3 is a partially sectional view of a socket contact employing the socket body and spring member shown in Figures 1 and 2, respectively. Figure 4 is an end view of the spring member shown in Figure 2. Figure 5 is a developed view showing a plurality of spring member tabs in the area of a contact body groove. Figure 6 illustrates a protective sleeve. Figure 7 illustrates the feature of the invention whereby the spring member tabs are formed over the contact body groove through the protective sleeve. DETAILED DESCRIPTION OF THE INVENTION The present invention contemplates construction of such a socket contact as described comprising a separate socket body, a tubular spring member and an outer glide sleeve. Figure 1 depicts the socket body 10 which is formed from solid stock material as by machining, die casting, upsetting, or other similar manufacturing process, to include at the rear end 12 thereof having a terminal portion 14 adapted to receive the bared end of an electrical conductor for crimping or soldering connection thereto. The socket contact 10 at its other, forward end is provided with a generally cylindrical projection 16 adjacent to a larger diameter locating shoulder 18. A retention shoulder 21 is formed intermediate either end of the socket body 10. Since the socket body 10 is formed by relatively precision processes, such as machining, the retention shoulder 21 is accurately sized and located, and possesses a relatively high degree of strength and rigidity. The socket body 10 is constructed of an electrically conductive material, and for crimping to the electrical conductor, may advantageously be constructed of brass, with a suitable surface processing or plating to prevent corrosion. The projection 16 includes a forward, relatively larger diameter section 20 at the forward end the socket body 10, with an intermediate groove 22 machined or otherwise formed therein. A chamfer 24 may also be provided at the front end of the projection 16. The projection 16 also includes a reduced diameter section 26 intermediate the larger diameter section 20 and the locating shoulder 18. Referring to Figure 2, the spring member 28 is separately manufactured as by forming sheet metal or by drawing or other similar manufacturing methods to provide the generally tubular spring member 28. Adjacent to the rear end 30 of the spring member 28 is an internal diameter 32, which is sized to be fit over the larger diameter section 20 of the socket body 10. The other or forward end is provided with a series of two or more spring fingers 34 formed by a plurality of slots 36 extending axially towards the rear end 30 of the spring member 28. The spring fingers 34 are readily convergent such as to be enabled to exert a spring force on a mating pin contact (not shown) in a manner well known to those skilled in the art. The spring member 28 is also provided with a circumferential crimp 38 extending radially inward from and adjacent to the internal diameter 32 at the rear end 30 of the spring member 28. This is employed in cooperation with the groove 22 as a locating feature at assembly, and to improve the electrical connection. The rear portion 30 of the spring member 28 terminates in a plurality of tabs 52 shown as three in number in Figures 4 and 5, and equally spaced around the circumference of the spring member and having a purpose as will be hereinafter described. The spring member 28 may be manufactured from beryllium copper or other similar material with a suitable plating thereof such as gold plating, applied to improve the surface conductivity thereof in a manner well known to those skilled in the art. Figure 3 depicts the assembly of the socket body 10 to the spring member 28 and an outer protective sleeve 40 as shown in Figure 6 to form a completed socket contact 50. The particular arrangement of a solid contact characterized by contact body 10, tubular spring member 28 and protective sleeve 40 is described in substantial detail in the aforenoted U.S. Patent 4,461,531. Only as much of the arrangement as is necessary for understanding the present invention has been described herein. The protective sleeve 40 illustrated in Figure 6 is used to protect spring fingers 34 of tubular spring member 28 shown in Figure 2. Sleeve 40 may be of material such as stainless steel and includes a forward end 42 which has been rolled inwardly to provide means for guiding a pin type contact (not otherwise shown) into the sleeve. The opposite end 36 of sleeve 40 is slightly flared so that it may be disposed over contact body 20 shown in Figure l where it may then be rolled into groove 26 of the contact body. When using a socket contact of the type so far described it is imperative that a highly reliable joint be made between spring member 28 and the groove end of contact body 10 in order to avoid electrical discontinuities that might otherwise occur. The present invention uses tabs 52 shown in Figures 4 and 5 for this purpose. Tabs 52 are stamped on the rear portion 30 of spring member 28 so as to provide relief for the spring material when the tabs are formed over groove 26 of contact body 10 as shown in Figure 7. With further reference to Figure 7, spring member 28 snaps over contact body 10 so that tabs 52 are in the area of groove 26. Sleeve 40 is disposed over spring 28. Thereafter tabs 52 are formed over groove 26 through sleeve 40 as also shown in Figure 7, whereby the resulting groove and formed tab arrangement prevents axial movement of spring member 28. The aforenoted forming over is accomplished by conventional means such as crimping or the like as at A in the Figure. There has thus been described a socket contact for an electrical connecter in which a groove in a machined contact body combined with tabs on a formed spring member is used to join the spring member to the termination end of the machined contact body for producing a highly reliable electrical connection between the spring member and the contact body.

Claims: A socket contact for an electrical connector, including a solid contact body (10) with a forward end provided with a generally cylindrical projection (16) having at least one intermediate groove (35) and at least one circumferential groove (26) thereon ; a tubular spring member (28) including a circumferential crimp (38) which cooperates with the intermediate groove to permit the member to be snapped over the contact body, a sleeve member (40) telescopically disposed over the tubular spring member ; and characterized in that the spring member (28) at a rear end (30) thereof terminates in a plurality of tabs (52) formed inwardly over the circumferential groove (26) to prevent axial movement of the spring member and provide a reliable electrical joint between the spring member and the contact body, whereby an end (36) of the sleeve (40) is engagingly surrounding the tabs (52). A socket contact as described by claim 1, characterized in that the tabs in the plurality of tabs (52) are spaced around the circumference of the spring member (28) at the rear portion (30) thereof. A socket contact as described by claim 2, characterized in that the plurality of tabs includes at least three tabs (52). A socket contact as described by claim 1, characterized in that the tabs in the plurality of tabs (52) are spaced around the circumference of the spring at the rear portion (30) thereof so as to provide relief for the spring material when the tabs (52) are formed over the groove (26). A socket contact as described by claim 4, characterized in that the plurality of tabs includes at least three tabs. A method for providing a socket contact for an electrical connector, including the steps of providing a solid contact body (10) with a forward end provided with a generally cylindrical projection (16); providing a circumferential groove (26) on the projection (16); snapping a tubular spring member (28) by snapping a circumferential crimp (38) into an intermediate groove (35) on said projection (16); telescopically disposing a sleeve (40) over the tubular spring member; and characterized by the step of forming spring member tabs (52) at a rear end (30) of said spring over the circumferential groove (38) through the sleeve for preventing axial movement of the spring member and for providing a reliable electrical joint between the spring member and the contact body, whereby an end (36) at the sleeve (40) is engagingly surrounding the tabs (52). A method for providing a socket contact as described by claim 11, characterized by circumferentially spacing the tabs (52) around the spring member at the rear portion (30) thereof. A method for providing a socket contact as described by claim 12, characterized by circumferentially spacing the tabs around the spring member at the rear portion (30) thereof for relieving the spring member material when forming the tabs (52) over the groove (26).

Inventors: PISCITELLI R AMELIA, PISCITELLI, R. AMELIA
Applicants: AMPHENOL CORP, AMPHENOL CORPORATION
Application year: 1989
Main classification: H01R13
IPC codes: H01R13