EP0390865A1 - Electrical socket terminal. - Google Patents

Electrical socket terminal.

Info

Publication number
EP0390865A1
EP0390865A1 EP89901242A EP89901242A EP0390865A1 EP 0390865 A1 EP0390865 A1 EP 0390865A1 EP 89901242 A EP89901242 A EP 89901242A EP 89901242 A EP89901242 A EP 89901242A EP 0390865 A1 EP0390865 A1 EP 0390865A1
Authority
EP
European Patent Office
Prior art keywords
socket
contact
base
terminal according
sleeve
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.)
Granted
Application number
EP89901242A
Other languages
German (de)
French (fr)
Other versions
EP0390865B1 (en
Inventor
Jurgen Hass
Gheorghe Hotea
Guenter Siegel
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.)
Whitaker LLC
Original Assignee
AMP Inc
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 AMP Inc filed Critical AMP Inc
Publication of EP0390865A1 publication Critical patent/EP0390865A1/en
Application granted granted Critical
Publication of EP0390865B1 publication Critical patent/EP0390865B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02—Contact members
    • H01R13/10—Sockets for co-operation with pins or blades
    • H01R13/11—Resilient sockets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02—Contact members
    • H01R13/15—Pins, blades or sockets having separate spring member for producing or increasing contact pressure
    • H01R13/18—Pins, blades or sockets having separate spring member for producing or increasing contact pressure with the spring member surrounding the socket

Definitions

  • an electrical socket terminal for mating with an electrical pin-
  • an electrical socket terminal comprising an elongate stamped and formed metal socket having a tubular base from one end of which projects a pair of elongate contact springs, which extend in a direction away from said base and have contact surfaces which are proximate to a forward end of the socket, remote from the base, and which extend towards each other to grip an electrical pin inserted between the contact surfaces from said forward end.
  • an electrical socket* terminal as defined in the second paragraph of this specification is characterized in that each contact spring is of substantially L-shaped cross section, and thus has two parts extending transversely of each other as seen in cross section, each part being formed with one of said contact surfaces, the two parts of each contact spring being divided by a slot extending longitudinally of the contact spring, between the contact surfaces thereof and said base.
  • the said contact force is determined by the length of said slots which can accurately be stamped out of a sheet metal blank from which the socket terminal is to be formed.
  • each contact spring preferably extend at right angles to each other and are preferably o identical dimensions, the pin being of square cross section, the contact surfaces being smoothly arcuate.
  • each slot extends for the whole distance between the contact surface and the base.
  • the base is preferably of square cross section, each contact spring extending from the forward ends of two adjacent side walls of the base.
  • the socket terminal is preferably provided with a protective sleeve which acts to restrain overstress of the contact springs, should the terminal be mated with an oversized pin or a pin be inserted into the socket in misalignment therewith.
  • FIGURE 1 is a side view of an electrical socket terminal provided with a protective sleeve
  • FIGURE 2 is a side view of a socket terminal
  • FIGURE 3 is a top plan view of the socket terminal.
  • FIGURE 4 is a view taken on the lines 4-4 of Figure l;
  • FIGURE 5 is a view taken on the lines 5-5 of Figure
  • FIGURE 6 is a side view of the protective sleeve
  • FIGURE 7 is a top plan view of the protective sleeve
  • FIGURE 8 is a front end view of the protective sleeve
  • FIGURE 9 is a fragmentary side view of the forward end of the socket terminal
  • FIGURE 10 is a view taken on the lines 10-10 of Figure 9;
  • FIGURE 11 is a fragmentary view taken on the lines 11-11 of Figure 10;
  • FIGURE 12 is a view taken on the lines 12-12 of Figure 9
  • FIGURE 13 is a view taken on the lines 13-13 of Figure 9;
  • FIGURE 14 is a view taken on the lines 14-14 of Figure 2;
  • FIGURE 15 is a front end view of the socket terminal showing, in cross section, an electrical pin mated with the socket terminal;
  • FIGURE 15A is a fragmentary side view showing the leading end portion of the pin; and FIGURE 16 is a plan view of a sheet metal blank from which the socket terminal was formed.
  • a socket terminal 2 is provided with a protective metal sleeve- 4.
  • the socket terminal 2 comprises, as best seen in Figures 2 and 3, a stamped and formed metal socket 6 and a wire connecting portion & joined to the socket 6 by a transition portion 9, the terminal 2 having been formed from a sheet metal blank 10 which is shown in Figure 16.
  • the socket 6 comprises a substantially square cross-section, tubular base 12 of constant cross-sectional area, from the forward end 13 of which extends a pair of elongate contact springs 14, formed from portions 14' of the blank 10.
  • the base 12 is formed to its square cross-sectional shape from a portion 12' of the blank 10, and has a seam 16 defined by opposite edges 17' of said portion 12' .
  • Each contact spring 14 extends from a respective pair of adjacent edges 15 and 19 ( Figure 14) at the forward end 13 of the base 12.
  • each contact spring is substantially L-shaped as seen in cross section, comprising two identical planar parts 18 and 20, so that the contact springs 14 are of substantially square overall cross section, as seen in Figures 5, 10, 12 to 14 and 15.
  • Each contact spring 14 has formed in both of its parts 18 and 20, a contact boss 22 projecting inwardly of the socket ⁇ at a position remote from the base 12 and proximate to the forward end 24 of the socket 6.
  • Each boss 22 defines a smoothly arcuate, part-spherical contact surface 26, the surfaces 26 being arranged in precisely opposed pairs and being constantly spaced about the internal periphery of the' socket 6, as best seen in Figures 5, 10, 12, 14 and 15.
  • each contact spring 14 is longitudinally divided by a slot 28, as will be apparent from a study of slots 28' in the blank 10.
  • each contact spring 14 is connected together, by a ' fold 21, at the contact bosses 22 and between the bosses 22 and the end 24, the parts 18 and 20 also being connected at the base 12.
  • the contact springs 14 are substantially parallel to one another between the base 12 and the end 24 and are arranged in rotational symmetry.
  • the wire connecting portion 8 comprises a substantially U cross section wire barrel 30 for crimping about the stripped electrically conductive core of an insulated electrical lead (not shown) and a pair of upstanding ears 32 for crimping about the insulation of the lead, the transition portion 9. also being of substantially U-shaped cross section.
  • the portions of the blank pin from which the barrel 30 and ears 32, were formed, are referenced 30'and 32', respectively, in Figure 16.
  • the protective sleeve 4 is, as best seen in Figures 4, 5 and 8, of substantially square cross section and was stamped and formed from a single piece of sheet metal, as was the socket terminal 2.
  • the sleeve 4 has struck from its upper, as seen in Figures 4, 6 and 8, wall 36, a locking tongue 38 having a free end 39 for engaging a shoulder in a cavity in an insulating housing (not shown- for the purpose of retaining the socket terminal 2 therein.
  • One side wall 40 of sleeve 4 projects above tht. wall 36 to provide a keying plate 42 for reception in a groove in the housing, for the purpose of properly orienting the terminal 2 with respect thereto.
  • the plate 42 extends slightly above the free end 39 and thus affords some protection for the locking tongue 38.
  • the forward end 37 of the sleeve 4 has projecting therefrom, obliquely inwardly of the sleeve 4, four retaining flanges 44 and at its rear end 45, a pair of opposed clinching ears 46.
  • the sleeve 4 is assembled to the socket terminal 2 by inserting the latter with its forward end 24 leading, through the rear end 45 of the sleeve 4 until the forward end 24 abuts the flanges 44, and then clinching the ears 46 about the transition portion 9 forwardly of a pair of upstanding projections 48 thereof.
  • the sleeve 4 is thus fixedly attached to the terminal 2 since the ears 46 lie between the projections 48 and the base 12 of the terminal 2.
  • Said contact and insertion forces can easily and accurately be predetermined for given pin cross-sectional dimensions by appropriately selecting the dimensions of the slots 28' in the blank 10.
  • the contact force exerted by the surfaces 26 against the sides of the pin P should be made high enough to provide satisfactory electrical contact between the surfaces 26 and the sides of the pin P without the insertion force of the pin P being unduly high.
  • the flanges 44 of the sleeve 4 act to restrain overstress of the contact springs 14 should an oversized pin be inserted into the socket 6 or should a pin be inserted into the socket 6 in misalignment therewith.
  • the base 12 is laser welded, at positions X indicated in broken lines 14 in Figure 3, to provide a more stable support for the contact springs 14, the sleeve 4 also being preferably laser welded at positions Y indicated in broken lines in Figures 6 and 7, for improved protection of the contact springs 14 against overstressing.

Landscapes

  • Connector Housings Or Holding Contact Members (AREA)
  • Manufacturing Of Electrical Connectors (AREA)

Abstract

La borne (2) comprend une douille à broche métallique matricée et conformée (6) comprenant une base (12) à partir de laquelle s'étendent deux ressorts de contact (14), comportant chacun une partie avant de section transversale en L dotée de parties identiques (18 et 20) s'étendant à angles droits l'une par rapport à l'autre. Derrière les bosses de contact (22) des ressorts (14), chaque ressort (14) comporte une fente longitudinale (28) permettant aux parties (18, 20) de chaque ressort (14) de s'écarter l'une de l'autre de manière élastique, lorsqu'une broche (P) à section transversale carrée est introduite dans la douille (6), sans que la force d'introduction de la broche ou que la force de contact exercée par les bosses de contact (22) contre la broche (P), ne soit excessive. On peut prédéterminer ces forces en dimensionnant adéquatement les fentes (28).The terminal (2) comprises a socket with a stamped and shaped metal pin (6) comprising a base (12) from which extend two contact springs (14), each comprising a front section of L-shaped cross section provided with identical parts (18 and 20) extending at right angles to each other. Behind the contact bumps (22) of the springs (14), each spring (14) has a longitudinal slot (28) allowing the parts (18, 20) of each spring (14) to move away from one of the other resiliently, when a pin (P) of square cross section is introduced into the socket (6), without the force of introduction of the pin or the contact force exerted by the contact bumps (22) against the spindle (P), is excessive. These forces can be predetermined by adequately dimensioning the slots (28).

Description

ELECTRICAL SOCKET TERMINAL
This invention relates to an electrical socket terminal for mating with an electrical pin- There is described in the specification of DE-U-8608199.3, an electrical socket terminal comprising an elongate stamped and formed metal socket having a tubular base from one end of which projects a pair of elongate contact springs, which extend in a direction away from said base and have contact surfaces which are proximate to a forward end of the socket, remote from the base, and which extend towards each other to grip an electrical pin inserted between the contact surfaces from said forward end.
It is an object of the present invention to provide such a socket terminal, in which the contact force exerted by the contact surfaces against the pin can readily and accurately be predetermined.
According to the .present invention, therefore, an electrical socket* terminal as defined in the second paragraph of this specification is characterized in that each contact spring is of substantially L-shaped cross section, and thus has two parts extending transversely of each other as seen in cross section, each part being formed with one of said contact surfaces, the two parts of each contact spring being divided by a slot extending longitudinally of the contact spring, between the contact surfaces thereof and said base. The said contact force is determined by the length of said slots which can accurately be stamped out of a sheet metal blank from which the socket terminal is to be formed.
The two parts of each contact spring preferably extend at right angles to each other and are preferably o identical dimensions, the pin being of square cross section, the contact surfaces being smoothly arcuate. According to an embodiment of the invention, each slot extends for the whole distance between the contact surface and the base. The base is preferably of square cross section, each contact spring extending from the forward ends of two adjacent side walls of the base. The socket terminal is preferably provided with a protective sleeve which acts to restrain overstress of the contact springs, should the terminal be mated with an oversized pin or a pin be inserted into the socket in misalignment therewith.
For a better understanding of the invention, and to show how it may be carried into effect, reference will now be made by way of example to the accompanying drawings in which: FIGURE 1 is a side view of an electrical socket terminal provided with a protective sleeve;
FIGURE 2 is a side view of a socket terminal;
FIGURE 3 is a top plan view of the socket terminal.;
FIGURE 4 is a view taken on the lines 4-4 of Figure l;
FIGURE 5 is a view taken on the lines 5-5 of Figure
1;
FIGURE 6 is a side view of the protective sleeve; FIGURE 7 is a top plan view of the protective sleeve; FIGURE 8 is a front end view of the protective sleeve;
FIGURE 9 is a fragmentary side view of the forward end of the socket terminal;
FIGURE 10 is a view taken on the lines 10-10 of Figure 9;
FIGURE 11 is a fragmentary view taken on the lines 11-11 of Figure 10;
FIGURE 12 is a view taken on the lines 12-12 of Figure 9; FIGURE 13 is a view taken on the lines 13-13 of Figure 9;
FIGURE 14 is a view taken on the lines 14-14 of Figure 2; FIGURE 15 is a front end view of the socket terminal showing, in cross section, an electrical pin mated with the socket terminal;
FIGURE 15A is a fragmentary side view showing the leading end portion of the pin; and FIGURE 16 is a plan view of a sheet metal blank from which the socket terminal was formed.
As shown in Figures 1, 4 and 5, a socket terminal 2 is provided with a protective metal sleeve- 4.
The socket terminal 2 comprises, as best seen in Figures 2 and 3, a stamped and formed metal socket 6 and a wire connecting portion & joined to the socket 6 by a transition portion 9, the terminal 2 having been formed from a sheet metal blank 10 which is shown in Figure 16.
The socket 6 comprises a substantially square cross-section, tubular base 12 of constant cross-sectional area, from the forward end 13 of which extends a pair of elongate contact springs 14, formed from portions 14' of the blank 10. The base 12 is formed to its square cross-sectional shape from a portion 12' of the blank 10, and has a seam 16 defined by opposite edges 17' of said portion 12' . Each contact spring 14 extends from a respective pair of adjacent edges 15 and 19 (Figure 14) at the forward end 13 of the base 12. As will be apparent from Figures 4 and 5, each contact spring is substantially L-shaped as seen in cross section, comprising two identical planar parts 18 and 20, so that the contact springs 14 are of substantially square overall cross section, as seen in Figures 5, 10, 12 to 14 and 15. Each contact spring 14 has formed in both of its parts 18 and 20, a contact boss 22 projecting inwardly of the socket έ at a position remote from the base 12 and proximate to the forward end 24 of the socket 6. Each boss 22 defines a smoothly arcuate, part-spherical contact surface 26, the surfaces 26 being arranged in precisely opposed pairs and being constantly spaced about the internal periphery of the' socket 6, as best seen in Figures 5, 10, 12, 14 and 15. Between the contact bosses 22 and the base 12, each contact spring 14 is longitudinally divided by a slot 28, as will be apparent from a study of slots 28' in the blank 10. Thus, the parts 18 and 20 of each contact spring 14 are connected together, by a' fold 21, at the contact bosses 22 and between the bosses 22 and the end 24, the parts 18 and 20 also being connected at the base 12. The contact springs 14 are substantially parallel to one another between the base 12 and the end 24 and are arranged in rotational symmetry.
The wire connecting portion 8 comprises a substantially U cross section wire barrel 30 for crimping about the stripped electrically conductive core of an insulated electrical lead (not shown) and a pair of upstanding ears 32 for crimping about the insulation of the lead, the transition portion 9. also being of substantially U-shaped cross section. The portions of the blank pin from which the barrel 30 and ears 32, were formed, are referenced 30'and 32', respectively, in Figure 16.
The protective sleeve 4 is, as best seen in Figures 4, 5 and 8, of substantially square cross section and was stamped and formed from a single piece of sheet metal, as was the socket terminal 2. The sleeve 4 has struck from its upper, as seen in Figures 4, 6 and 8, wall 36, a locking tongue 38 having a free end 39 for engaging a shoulder in a cavity in an insulating housing (not shown- for the purpose of retaining the socket terminal 2 therein. One side wall 40 of sleeve 4 projects above tht. wall 36 to provide a keying plate 42 for reception in a groove in the housing, for the purpose of properly orienting the terminal 2 with respect thereto. The plate 42 extends slightly above the free end 39 and thus affords some protection for the locking tongue 38. The forward end 37 of the sleeve 4 has projecting therefrom, obliquely inwardly of the sleeve 4, four retaining flanges 44 and at its rear end 45, a pair of opposed clinching ears 46. The sleeve 4 is assembled to the socket terminal 2 by inserting the latter with its forward end 24 leading, through the rear end 45 of the sleeve 4 until the forward end 24 abuts the flanges 44, and then clinching the ears 46 about the transition portion 9 forwardly of a pair of upstanding projections 48 thereof. The sleeve 4 is thus fixedly attached to the terminal 2 since the ears 46 lie between the projections 48 and the base 12 of the terminal 2.
•When a square cross section electrical pin P having a tapered leading end portion T as shown in Figure 15A, is inserted through the forward end 24 of the terminal 2. Each of the four sides of the pin P is engaged by a respective contact surface 26, as shown in Figure 15, so that the parts 18 and 20 of each spring 14 are splayed slightly apart, flexing resiliently about the fold 21. By virtue of the slots 28, the connected parts 18 and 20 of the contact springs 14 can flex apart from one another without undue resistance, so that the insertion force of the pin P and the contact force exerted by the contact surfaces 26 against the pin P are held to an acceptable level.
Said contact and insertion forces can easily and accurately be predetermined for given pin cross-sectional dimensions by appropriately selecting the dimensions of the slots 28' in the blank 10. The contact force exerted by the surfaces 26 against the sides of the pin P should be made high enough to provide satisfactory electrical contact between the surfaces 26 and the sides of the pin P without the insertion force of the pin P being unduly high.
The flanges 44 of the sleeve 4 act to restrain overstress of the contact springs 14 should an oversized pin be inserted into the socket 6 or should a pin be inserted into the socket 6 in misalignment therewith. Preferably, the base 12 is laser welded, at positions X indicated in broken lines 14 in Figure 3, to provide a more stable support for the contact springs 14, the sleeve 4 also being preferably laser welded at positions Y indicated in broken lines in Figures 6 and 7, for improved protection of the contact springs 14 against overstressing.

Claims

CLAIMS;
1. An electrical socket terminal (2) comprising an elongate stamped and formed metal socket (6) having a tubular base (12) from one end (13) of which projects a pair of elongate contact springs (14) , which extend in a direction away from said base (12) and have contact surfaces (26) proximate to a forward end (24) of the socket (6) , remote from the base (12) , and which extend towards each other to grip an electrical pin (P) inserted between the contact surfaces (26) from said forward end (24) ; characterized in that each contact spring (14) is of substantially L-shaped cross section and thus has two parts (18 and 20) extending transversely of each other as seen in cross section, each part (18 and 20) being formed with one of said contact surfaces (26) , the two parts (18 and 20) of each contact spring (14) being divided by a slot (28) extending longitudinally of the contact spring (14) , between the contact surfaces (26) thereof, and said base (12).
2. A terminal according to claim 1, characterized in that said contact spring (14) are two in number and are arranged in rotational symmetry.
3. A terminal according to claim 1 or 2, characterized in that the parts (18 and 20) of each contact spring (14) extend at right angles to each other and are of equal dimensions.
4. A terminal according to claim 1, 2 or 3, characterized in that each slot (28) extends from a position proximate to the contact surfaces (22) of the respective contact spring (14) , up to said base (12) .
5. A terminal according to any one of the preceding claims, characterized in that the contact surfaces (26) are constantly spaced from each other about the internal periphery of the socket (6) .
6. A terminal according to a*ny one of the preceding claims, characterized in that the tubular base (12) is of square cross section, each contact spring (14) extending from adjacent forward edges (15 and 19) of the base (12) .
7. A terminal according to any one of the preceding claims, characterized in that the socket is surrounded by a protective sleeve (4) which is of square cross section and which is secured to said base (12) , a wall (36) of the sleeve (4) having a locking tongue (38) struck out therefrom and projecting obliquely away from said wall (36) , an adjacent wall (40) of the sleeve (4) having a keying extension (42) projecting therefrom at right angles to the first wall (36) and extending beyond the free end (39) of the locking lance (38) .
8. A terminal according to claim 7, characterized in that at one end thereof the sleeve (4) has extending obliquely from each wall thereof and inwardly of the sleeve (4) , a flange (44) projecting over said forward end (24) of the socket (6) to restrain overstress of the contact springs (14) .
9. A terminal according to claim 8, characterized in that a wire connecting portion (8) extending from the opposite end of the socket (6) is connected thereto by a transition portion (9) of the socket terminal (2) , the sleeve (4) having a pair of ears (46) clinched to the transition portion (9) .
10. A terminal according to any one of the preceding claims, characterized in that said base (12) has been laser welded better to support the contact springs (14) .
11. A terminal according to claim 7, characterized in that the protective sleeve (4) has been laser welded better to restrain overstress of the contact springs (14) .
12. An electrical socket terminal, substantially as hereinbefore described with reference to the accompanying drawings.
EP89901242A 1987-12-07 1988-12-05 Electrical socket terminal Expired - Lifetime EP0390865B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB878728575A GB8728575D0 (en) 1987-12-07 1987-12-07 Electrical socket terminal
GB8728575 1987-12-07

Publications (2)

Publication Number Publication Date
EP0390865A1 true EP0390865A1 (en) 1990-10-10
EP0390865B1 EP0390865B1 (en) 1993-09-15

Family

ID=10628112

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89901242A Expired - Lifetime EP0390865B1 (en) 1987-12-07 1988-12-05 Electrical socket terminal

Country Status (5)

Country Link
EP (1) EP0390865B1 (en)
JP (1) JP2655734B2 (en)
DE (2) DE3884216T2 (en)
GB (1) GB8728575D0 (en)
WO (1) WO1989005531A1 (en)

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Also Published As

Publication number Publication date
DE3884216T2 (en) 1994-04-07
EP0390865B1 (en) 1993-09-15
JP2655734B2 (en) 1997-09-24
GB8728575D0 (en) 1988-01-13
WO1989005531A1 (en) 1989-06-15
DE8815178U1 (en) 1989-02-02
JPH03502622A (en) 1991-06-13
DE3884216D1 (en) 1993-10-21

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