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EP0218325B1 - Stift aufnehmende Klemme - Google Patents

Stift aufnehmende Klemme Download PDF

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Publication number
EP0218325B1
EP0218325B1 EP19860305918 EP86305918A EP0218325B1 EP 0218325 B1 EP0218325 B1 EP 0218325B1 EP 19860305918 EP19860305918 EP 19860305918 EP 86305918 A EP86305918 A EP 86305918A EP 0218325 B1 EP0218325 B1 EP 0218325B1
Authority
EP
European Patent Office
Prior art keywords
pin
shaped member
terminal
legs
spring fingers
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
EP19860305918
Other languages
English (en)
French (fr)
Other versions
EP0218325A3 (en
EP0218325A2 (de
Inventor
Irvin R. Triner
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.)
Molex LLC
Original Assignee
Molex LLC
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 Molex LLC filed Critical Molex LLC
Publication of EP0218325A2 publication Critical patent/EP0218325A2/de
Publication of EP0218325A3 publication Critical patent/EP0218325A3/en
Application granted granted Critical
Publication of EP0218325B1 publication Critical patent/EP0218325B1/de
Expired legal-status Critical Current

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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
    • H01R13/115—U-shaped sockets having inwardly bent legs, e.g. spade type

Definitions

  • the present invention pertains to pin-receiving terminals.
  • box-type terminals are that a high spring rate can be obtained in repeated cycles, over a range of deflections in which the terminal is not overstressed so as to set or deform.
  • other means must be utilized to achieve a high spring rate and workable deflection range in close centerline-spaced terminal arrangements.
  • preloading of the terminal mating portions by partially stressing them before mating requires a specially designed housing with relatively strict tolerances.
  • Single-cantilevered spring fingers are a preferred pin-mating design, due to their simple construction.
  • higher spring rates require higher tolerances in the metal stamping and forming operations.
  • Most notable among the tolerances is the gap width and the cross sectional dimension of the pin-receiving region of the terminal. Too small of a gap leads to increased insertion forces, and increases the risk of terminal overstress, with deflection beyond its plastic deformation limit. Too large a gap causes insufficient mating forces.
  • Terminal designs are also affected by other application requirements. For example, some connectors must be cycleable, i.e. capable of mating and unmating many times over their useful life. This high cycleability requirement is economically satisfied by low insertion force connectors which minimally degrade a mating pin surface. With withdrawal forces being directly related to mating pressure, low insertion force requirements are met in low ratios of insertion-to-withdrawal forces.
  • EP-A-0191539 [which falls within the scope of Article 54(3) EPC] discloses a pin-receiving terminal having a pin mating forward portion which is U-shaped and has legs from which a pair of cantilever spring fingers extend inwardly towards a rear portion.
  • FR-A-2108767 also discloses a pin-receiving electrical terminal.
  • the present invention provides a pin-receiving electrical terminal including a forward pin mating portion joined to a rear portion, the pin mating portion having a body section with a pair of opposed cantilever spring fingers extending inwardly therefrom and from a forward end of the body section toward the rear portion, with free ends adjacent the rear portion for imparting a mating force to a pin conductor received in a pin-receiving region defined therebetween, and in which said body section includes a resilient U-shaped member at the forward end thereof through which a pin conductor is to be received into the pin-receiving region, said U-shaped member having a curved base portion joining opposed legs resiliently deflectable relative to one another via the curved base portion to accommodate different-sized pin conductors therethrough, connecting means joining the opposed legs to the rear portion independently of the spring fingers, the connecting means defining an opening between the base of the U-shaped member and the rear section, and said spring fingers extend from said legs so that the free ends thereof generally move independently of the legs, whereby when a pin
  • Another object of the present invention is to provide a pin-receiving terminal of the above-described type in a terminal which is stamped and formed with a minimum number of low tolerance operations so as to have a single-cantilevered pin mating portion.
  • Still another object of the present invention is to provide a pin-receiving terminal of the above-described type suitable for close centerline spacing on a common carrier, which provides a minimum ratio of insertion to withdrawal forces, while providing an acceptable minimum spring rate and normal force.
  • Yet another object of the present invention is to provide a terminal of the above-described type which does not require preloading, and hence does not require specially-configured housings for mounting the terminal.
  • Terminals 10 are shown connected to a common carrier 12.
  • Terminals 10 are arranged in side-by-side arrangement with a predetermined progression, ready for mass insertion in a connector having a corresponding number of similarly-spaced, side-by-side terminal receiving cavities.
  • Terminals 10 and carrier 12 are formed from an integral metallic stamped blank to have a forward pin-mating body section 16, a rear portion 18 and a remote part 20.
  • rear portion 18 provides a transition between the pin-mating body section 16 and the remote part 20 which is shown as a pin-like mating portion.
  • the present invention is concerned primarily with body section 16 and rear portion 18, and is independent of the particular configuration of any remote part 20 that may be present.
  • part 20 could be omitted with rear portion 18 including a crimp termination portion or an insulation displacing portion as are known in the art.
  • Terminal 10 has a forward pin mating portion comprising a body section 16 having a forward end 24.
  • a pair of opposed single-cantilever spring fingers 26 are struck inwardly from body section 16 to extend from the forward end 24 toward rear portion 18.
  • Fingers 26 terminate in free ends 28, adjacent rear portion 18, and include camming surfaces 30 for wiping engagement with a mating pin terminal 32, which is partially shown in the lefthand portion of FIG. 1.
  • pin 32 When fully mated, pin 32 is received in a pin-receiving region 44 formed between fingers 26 and particularly the camming surfaces 30 thereof.
  • the body section 16 includes a resilient U-shaped member 36 formed at forward end 24. Fingers 26 are integrally joined to the legs 38 of U-shaped member to receive cantilever support therefrom. Legs 38 are resiliently deflectable toward and away from each other, to accommodate different-size pin conductors 32, as will be explained later in greater detail.
  • the U-shaped member 36 is joined to rear portion 18 independently of spring fingers 26, by a pair of spaced-apart arms 40 which are joined at their forward end to the U-shaped member 36 (adjacent the bight portion thereof) and at their rearward end to rear portion 18.
  • the pair of arms 40 are conveniently formed by punching a slot 42 in body section 16.
  • leg portions 38 are arranged coplanar with adjacent vertical sidewalls 43 of rear portion 18, with the free ends 28 of cantilever spring fingers struck inwardly therefrom.
  • Arms 40 are positioned on the curved bight portion of the U-shaped member 36, at a point immediately adjacent the relatively straight leg portions 38. As a result, each arm 40 is generally coplanar with its adjacent spring finger 26.
  • rear portion 18 is conveniently formed with the same cross-sectional shape of body section 16. Consequently, the legs 38 of U-shaped member 36 are generally coplanar with the sidewalls 43 of rear portion 18. As will be readily appreciated by those skilled in the art, rear portion 18 need not have a U-shape in cross section, but rather, may have any convenient shape desired. Further, rear portion 18 can be larger or smaller in cross-section than body section 16.
  • FIG. 2 is an end view of the terminal of FIG. 1, as would be seen by a mating pin conductor.
  • the pin receiving region 44 formed between spring fingers 26 and U-shaped member 36 has a minimum width W formed between camming surfaces 30.
  • Terminal 10 is dimensioned such that width W is slightly less than the corresponding cross-sectional dimension of a mating pin terminal. Accordingly, when mated with a pin terminal, the free ends 28 of spring fingers 26 are outwardly deflected, with the extent of deflection over which the spring rate is developed, being generally termed the "working range" of the terminal.
  • the resilient mating members (herein, fingers 26) not be overstressed or deformed throughout their working range.
  • the spring fingers 26 Once the spring fingers 26 are spread apart a sufficient amount, further mating causes legs 38 to be spread apart, or outwardly resiliently deflected with respect to the bight portion of member 36, as indicated by arrows 48.
  • introduction of a pin conductor 32 of sufficient size first exerts a lateral force in the direction of arrows 50 sufficient to deflect the free ends of fingers 26, and thereafter the outward deflection force is transmitted through arms 26 to their rear end portions, to cause outward resilient deflection of U-shaped member 36.
  • This latter deflection of member 36 creates a resilient spring force which is coupled with the spring forces of fingers 26.
  • U-shaped member 36 Sufficient outward deflection of U-shaped member 36 causes torsional arms 40 to resiliently rotate in the direction of arrows 54.
  • Arms 40 are torsionally resilient, and their resilient bias force is coupled to the bias forces of U-shaped member 36, and spring fingers 26.
  • This three-way coupling of resilient bias forces provides an increased working range not capable with prior art terminals. That is, at the upper end of a range of pin sizes (and/or the lower end of the range of widths W) the free ends 28 of fingers 26 are deflected approximately the same constant amount with respect to the fixed cantilevered ends adjacent legs 38. With a constant deflection being maintained, any tendency to overstress or otherwise deform spring fingers 26 is precluded, owing to the additional spring effects of U-shaped member 36 and, optionally, torsional arms 40.
  • the spring rate of torsional arms 40 can be adjusted over a wide range of values relative to the spring rate of U-shaped member 36, by a judicious choice of length, cross-sectional area and shape, as well as a choice of materials for arms 40.
  • the spring rate of member 36 can be adjusted by the thickness of the metal blank, the width of the axially extending strapped portion of member 36 formed by slot 42.
  • the added resilient bias force of U-shaped member 36 may alone be enough to prevent overstress of fingers 26.
  • spring fingers 26 extend in the direction of pin insertion toward their free ends 28.
  • spring fingers 26 and arms 40 are conveniently formed by slitting the common elongated portion of body section 16, to position fingers 26 and arms 40 immediately adjacent to each other. In this way, arms 40 are generally coplanar with spring fingers 26 to provide the desired enhanced working range.
  • FIG. 4 a further embodiment of the present invention is shown in a terminal 110 substantially identical to the terminal of FIGS. 1 to 3, except for the modified body section 116.
  • the modified body section 116 is substantially identical to section 16 of FIGS. 1 to 3, but for an additional axially-extending strap 150 extending between the legs 138 of the forward U-shaped member 136 and rear portion 18.
  • Strap 150 provides an enhanced resistance to U-shaped member 136 against outward bowing of the open end of the U-shaped cross section.
  • the torsional deflection of strap 150 is not as great as that of arm 40, torsional resilience of strap 150 can be relied upon for further improvements of the type described above.
  • strap 150 can be configured to provide a resilient bending force which is coupled to the resilient spring force of fingers 26, to U-shaped member 136 and optionally to arm portions 40.
  • a pin-receiving terminal of the present invention provides a high minimum contact pressure (or normal force) and spring rate in a blank of narrow or reduced width (i.e., blanks arranged on a common closely-spaced reduced center-line progression such as 0.100 inches (0.254 cm) or less).
  • a terminal of the present invention further provides an improved low insertion/withdrawal ratio in a terminal having a high spring rate.
  • the terminal of the present invention may also provide these features in a single-ended cantilever beam mating part which can be conveniently formed meeting the above requirements, with a minimum number of low tolerance metal working and metal forming operations.
  • the present invention may provide a 300% improvement in combined pin cross-section dimension and gap width (W) tolerances.
  • the spring fingers 26 of the illustrated embodiments undergo a relatively constant minimum deflection over a wide range of pin and pin-receiving region tolerances, while achieving a minimally acceptable contact normal force.
  • the terminals may be stamped and formed with a minimum number of low tolerance operations so as to have a single-cantilevered pin mating portion.
  • the terminals are suitable for close centerline spacing on a common carrier and provide a minimum ration of insertion to withdrawal forces, while providing an acceptable minimum spring rate and normal force.
  • the terminals do not require pre-loading, and hence do not require specially-configured housings for mounting them.

Landscapes

  • Coupling Device And Connection With Printed Circuit (AREA)
  • Organic Insulating Materials (AREA)

Claims (3)

  1. Stiftaufnehmender elektrischer Anschluß (10) mit einem vorderen Stiftverbindungsbereich (16), der mit einem rückwärtigen Bereich (18) vereinigt ist, wobei der Stiftverbindungsbereich (16) einen Rumpfteil mit einem Paar einander gegenüberliegender freiendiger Federfinger (26) besitzt, die sich von diesem und von einem vorderen Ende (24) des Rumpfteils zum rückwärtigen Bereich (18) hin erstrecken, mit an den rückwärtigen Bereich angrenzenden freien Enden (28) zum Aufbringen einer Verbindungskraft auf einen in einer zwischen ihnen gebildeten Stiftaufnahmezone (44) aufgenommenen Leiterstift (32), und wobei
       der Rumpfteil ein federndes U-Formteil (36,136) an seinem vorderen Ende (24) aufweist, durch das ein Leiterstift (32) in die Stiftaufnahmezone (44) einzubringen ist, und das U-Formteil einen gekrümmten Basisbereich besitzt, der einander gegenüberliegende Schenkel (38;138) vereinigt, die federnd relativ zueinander über den gekrümmten Basisbereich zur Aufnahme unterschiedlich bemessener Leiterstifte durch diese auseinanderbiegbar sind,
       eine Verbindungseinrichtung (40) die einander gegenüberliegenden Schenkel (38;138) mit dem rückwärtigen Bereich unabhängig von den Federfingern verbindet, wobei die Verbindungseinrichtung eine Öffnung (42) zwischen der Basis des U-Formteils und dem rückwärtigen Teil bildet, und
       die Federfinger (26) von den Schenkeln (38;138) ausgehen, so daß ihre freien Enden sich im allgemeinen unabhängig von den Schenkeln bewegen,
       wodurch, wenn ein Leiterstift (32) in der Stifaufnahmezone (44) eingesetzt wird, die freien Enden der Federfinger (26) unter Entwicklung einer Kraft auf den Leiterstift ausgelenkt werden und die Auslenkung der Federfinger (26) die einander gegenüberliegenden Schenkel des U-Formteils auseinanderbewegt, wodurch eine zusätzliche Kraft entwickelt wird, die über die freien Enden der Federfinger auf den Leiterstift ausgeübt wird.
  2. Anschluß nach Anspruch 1, bei dem die Verbindungseinrichtung (40) zwei voneinander beabstandete Armbereiche aufweist, die verdreht werden, wenn die einander gegenüberliegenden Schenkel des U-Formteils unter Entwicklung einer Kraft auseinanderbewegt werden, die über die Schenkel und die Federarme auf den Verbinderstift ausgeübt wird.
  3. Anschluß nach Anspruch 2, ferner mit zwei voneinander beabstandeten federnden Gurtteilen (150), die das U-Formteil (136) mit dem rückwärtigen Bereich (18) verbinden, wobei jeder Federfinger (26) zwischen einem der Gurtteile (150) und einem der Armbereiche (40) angeordnet ist.
EP19860305918 1985-09-30 1986-08-01 Stift aufnehmende Klemme Expired EP0218325B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US78183885A 1985-09-30 1985-09-30
US781838 2001-02-12

Publications (3)

Publication Number Publication Date
EP0218325A2 EP0218325A2 (de) 1987-04-15
EP0218325A3 EP0218325A3 (en) 1988-09-28
EP0218325B1 true EP0218325B1 (de) 1992-11-11

Family

ID=25124111

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860305918 Expired EP0218325B1 (de) 1985-09-30 1986-08-01 Stift aufnehmende Klemme

Country Status (3)

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EP (1) EP0218325B1 (de)
JP (1) JPS6282673A (de)
DE (1) DE3687107T2 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4993975A (en) * 1989-07-07 1991-02-19 Amp Incorporated Electrical connector and tapered fixed beam contact therefor
US5151056A (en) * 1991-03-29 1992-09-29 Elco Corporation Electrical contact system with cantilever mating beams

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3188606A (en) * 1963-10-21 1965-06-08 Amp Inc Electrical connector
US3560911A (en) * 1968-09-24 1971-02-02 Amp Inc Disengageable electrical connections having improved contact spring means
EP0060024A1 (de) * 1981-03-05 1982-09-15 General Motors Corporation Elektrische Buchse

Also Published As

Publication number Publication date
DE3687107T2 (de) 1993-05-19
JPS6282673A (ja) 1987-04-16
EP0218325A3 (en) 1988-09-28
EP0218325A2 (de) 1987-04-15
DE3687107D1 (de) 1992-12-17

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