US3850499A - Contact strip - Google Patents

Contact strip Download PDF

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Publication number
US3850499A
US3850499A US00368632A US36863273A US3850499A US 3850499 A US3850499 A US 3850499A US 00368632 A US00368632 A US 00368632A US 36863273 A US36863273 A US 36863273A US 3850499 A US3850499 A US 3850499A
Authority
US
United States
Prior art keywords
contact
leg
transition section
cross
blade
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 - Lifetime
Application number
US00368632A
Other languages
English (en)
Inventor
G Bauerle
O Hubner
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.)
Amphenol Corp
Bunker Ramo Corp
Original Assignee
Bunker Ramo 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 Bunker Ramo Corp filed Critical Bunker Ramo Corp
Application granted granted Critical
Publication of US3850499A publication Critical patent/US3850499A/en
Assigned to ALLIED CORPORATION A CORP. OF NY reassignment ALLIED CORPORATION A CORP. OF NY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BUNKER RAMO CORPORATION A CORP. OF DE
Assigned to CANADIAN IMPERIAL BANK OF COMMERCE, NEW YORK AGENCY, AS AGENT reassignment CANADIAN IMPERIAL BANK OF COMMERCE, NEW YORK AGENCY, AS AGENT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AMPHENOL CORPORATION
Assigned to AMPHENOL CORPORATION, A CORP. OF DE reassignment AMPHENOL CORPORATION, A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ALLIED CORPORATION, A CORP. OF NY
Anticipated expiration legal-status Critical
Assigned to AMPHENOL CORPORATION A CORP. OF DELAWARE reassignment AMPHENOL CORPORATION A CORP. OF DELAWARE RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: CANADIAN IMPERIAL BANK OF COMMERCE
Expired - Lifetime 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
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/71—Coupling devices for rigid printing circuits or like structures
    • H01R12/72—Coupling devices for rigid printing circuits or like structures coupling with the edge of the rigid printed circuits or like structures
    • H01R12/722—Coupling devices for rigid printing circuits or like structures coupling with the edge of the rigid printed circuits or like structures coupling devices mounted on the edge of the printed circuits
    • H01R12/725—Coupling devices for rigid printing circuits or like structures coupling with the edge of the rigid printed circuits or like structures coupling devices mounted on the edge of the printed circuits containing contact members presenting a contact carrying strip, e.g. edge-like strip
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/71—Coupling devices for rigid printing circuits or like structures
    • H01R12/712—Coupling devices for rigid printing circuits or like structures co-operating with the surface of the printed circuit or with a coupling device exclusively provided on the surface of the printed circuit
    • H01R12/716—Coupling device provided on the PCB

Definitions

  • ABSTRACT A contact strip for printed circuit boards, of the type having a row of blade contacts embedded in a plastic strip, each blade contact being provided with a contact leg extending beyond the periphery of the printed circuit board and a connector leg projecting substantially perpendicular to the contact leg and making contact with drilled or stamped contact pads on the printed circuit board.
  • each blade contact is formed in its central area into an approximately semi-circular transition section, the connector leg being substantially tangent to the semicircular transition section, while the contact leg extends approximately perpendicular to a tangent to the semi-circular transition section.
  • This invention relates to a contact strip for printed circuit boards, of the type having a row of blade contacts embedded in a plastic strip, each blade contact being provided with a contact leg extending beyond the periphery of the printed circuit board and a connector leg projecting substantially perpendicular to the contact leg and making contact with drilled or stamped contact pads on the printed circuit board.
  • each blade contact has a contact leg for external connection and a connector leg for connection to the printed circuit board, the two legs disposed at approximately semi-circular transition section.
  • the connector leg is substantially tangent to the semi-circular transition section, while the contact leg is bent away from the semi-circular transition section at an obtuse angle.
  • the bent transition section formed as indicated above increases the area over which the contact is embedded in the plastic material and provides contact surfaces extending in continuously changing directions to anchor the blade contact firmly in place.
  • This configuration is advantageous for transferring the load from the blade contact to the connector body when the contact strip is inserted in a mating connector means. Further, such configuration also eliminates sharp angles in the blade contact and surrounding plastic so as to prevent cracking at the joints of the legs and to prevent protrusions at the plastic strip from being torn off when the contact leg is inserted in inclined position or when the contact leg experiences vibratory loads.
  • the semi-circular transition section facilitates embedding of the contacts in the plastic strip, since the plastic material easily flows into the arcuate inner section of the contact.
  • the angle between the transition section and the contact leg is preferably obtuse.
  • the configuration of the present invention provides an inclined contact area between the blade contact and the plastic strip within the area which sustains the axial or almost axially directed insertion pressure (pressure initially exerted upon the contact leg.) Because of the increased area about the contact, the load is resolved into longitudinal and transverse components and, hence, distributed over the plastic body.
  • an additional advantage of the present invention lies in the feature that areas prone to shearing or rupture are embedded in the plastic material and, hence, are supported by the same. Moreover, the additional length of contact embedded in the plastic improves the support rendered to the blade contacts by the plastic strip.
  • the dimensional changes in size of the blade contacts between the transition region and the connector leg and contact leg can be effected in simple fashion, namely, providing abrupt shoulders at the desired transition areas. Such transition areas also function to aid in attachment of the blade contact with the plastic strip near the entry or exit points of a leg.
  • the blade contact in accordance with the invention is embedded into a plastic contact strip having a substantially T-like cross-section in the support area of the blade contact.
  • One arm of the T and the central stem of the T are enlarged in cross-sectional dimension so as to accommodate the transition portion of the blade contact.
  • the other arm of the T and the lower part of the T stem are reduced in cross-section in order to conserve materials and lower the weight of the connector strip.
  • the contact leg of the blade contact extends perpendicular from approximately central of the thick arm of the T, while the connector leg extends substantially perpendicular to the thickened portion of the stem of the T.
  • the entire transition section of the blade contact, including the points of dimensional changes on the blade contact is therefore everywhere surrounded by thickened plastic material. This eliminates the need for a heavy plastic strip in all dimensions, thus reducing weight and avoiding excessive unnecessary costs of raw material.
  • the contact strip generally denoted by 1, consists of a plastic body or strip 2 and blade contacts 3 embedded in the plastic strip.
  • the cross-section of plastic strip 2 can be inferred from FIG. 2.
  • the cross-section of the strip itself is shown in the general form of an inverted T-like member having two arms 2c, 2d and a stem 2a.
  • the plastic strip defines a transverse protrusion 2b which aids in providing structural support for the strip.
  • the stem 2a comprises a reduced section 7 and a thickened section 8, while the arms of the T are defined by a relatively thin arm 20 and a relatively thick arm 2d.
  • the stem 2a and the arms 20 and 2d form elongate narrow transverse walls with each wall having a major cross-sectional dimension transverse to the major cross-sectional dimensisn of the other wall and plurality of spaced blade contacts 3 are embedded in the plastic strip longitudinally of the same.
  • Each blade contact 3 is provided with a contact leg 4, a connector leg 5, and a semi-circular transition section 6.
  • the contact leg 4 may end in a knife-like tip 4a.
  • Connector leg 5 may be tapered at its free end 5a.
  • contact leg 4 has a greater thickness than connector leg 5 or has a crosssectional dimension different from the corresponding cross-sectional dimension of leg 5.
  • contact leg 4 is wider than connector leg 5 or has a second cross-sectional dimension different from the second cross-sectional dimension of leg 5.
  • Transition section 6 has the width of the contact leg 4 and the thickness of the connector leg 5. The dimensional changes occur at transition regions or junctions between the two legs 4, 5 and in the transition section 6, as denoted at points 10 and 11 on the contact 3. Transition region 10 accommodates a change in width of the blade contact 3, while transition section 1 l accommodates a transition in thickness between the contact leg 4 and the transition region 6.
  • Connector 5 converges into transition section 6 in the form of a tangent to the semi-circular configuration of transition section 6, whereas the contact leg 4 and the adjacent portion of the transition section 6 enclose an obtuse angle.
  • Each blade contact 3 is embedded in plastic strip 2 along the entire transition section 6 and at the junctions of the transition section with the two legs.
  • the embedded portion of the transition section is continuously embedded in the walls defined by stem 2a and arms 2c and 2d, as may be seen in FIG.
  • the transition section extends along an are having a portion following the major cross-sectional dimension of each wall so that it is entirely situated within the thickened portion 8 of the stem of the T-shaped member and within the thick arm 2d of the T to distribute a portion of the forces occurring on insertion of the blade contact legs in respective socket contacts along the major cross-sectional dimension of each wall.
  • the thickened arm 2d of the T protrudes in the same direction as the connector leg 5.
  • FIG. 2 clearly illustrates this point and also shows the alignment of the contact leg 4 along the inner edge of the end walls 9 of the connector strip. Such an arrangement is not possible with prior art blade contacts having simple right angle configurations.
  • the blade contacts 3 can have uniform dimensions or additional dimensional changes than those shown in the drawings and described in the above description.
  • the cross-section of the plastic strip can vary within wide limits, as long as sufficient space for embedding the transition section is taken into account.
  • a contact strip for use with a plurality of socket contacts carried by a printed circuit board comprising:
  • plastic body having a pair of integrally formed elongate transverse narrow walls with each wallhaving a minor cross-sectional dimension and a major cross-sectional dimension with the major crosssectional dimension of one wall extending in a respective direction transverse to the major crosssectional dimension of the other wall;
  • each of said blade contacts including an integrally formed contact leg at one end of the respective blade contact with each contact leg extending in one direction from one wall of said body;
  • each blade contact integrally formed at the other end of each blade contact extending in another direction substantially perpendicular to the respective contact leg and from the other wall of said body;
  • each connector leg has a cross-sectional dimension drffering lrom 2L corresponding cross-sectional dimension of the respective contact leg, the dimensional change between the corresponding crosssaid transition section has a radius of curvature of about 2 mm.

Landscapes

  • Coupling Device And Connection With Printed Circuit (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
US00368632A 1972-06-12 1973-06-11 Contact strip Expired - Lifetime US3850499A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19727221907U DE7221907U (de) 1972-06-12 1972-06-12 Kontaktleiste

Publications (1)

Publication Number Publication Date
US3850499A true US3850499A (en) 1974-11-26

Family

ID=6630877

Family Applications (1)

Application Number Title Priority Date Filing Date
US00368632A Expired - Lifetime US3850499A (en) 1972-06-12 1973-06-11 Contact strip

Country Status (7)

Country Link
US (1) US3850499A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS5544428B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CA (1) CA996649A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE7221907U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1437359A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
HU (1) HU168181B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
RO (1) RO69599A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4483577A (en) * 1982-01-07 1984-11-20 Novis Joseph R Electrical bridging connector and method of use
US4530557A (en) * 1982-12-15 1985-07-23 Sony Corporation Microminiature connector
US4538877A (en) * 1982-01-07 1985-09-03 Novis Joseph R Electrical bridging connector with post separator housing

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2864977A (en) * 1953-10-14 1958-12-16 Richard P Witt Plug-in packages
FR1285352A (fr) * 1961-01-11 1962-02-23 Prise intercalaire pour coupe-circuit
US3111352A (en) * 1959-11-16 1963-11-19 Ibm Superconductive solderless connector
US3208026A (en) * 1961-10-31 1965-09-21 Elco Corp Protector of printed circuit contacts
US3315217A (en) * 1965-03-19 1967-04-18 Elco Corp Connector for thin film circuits
US3330004A (en) * 1963-11-04 1967-07-11 Nosco Plastics Hypodermic syringe
US3539974A (en) * 1969-04-17 1970-11-10 Quentin Berg Header block assembly
US3649957A (en) * 1970-05-28 1972-03-14 Western Electric Co Electrical connector
US3742427A (en) * 1971-08-26 1973-06-26 A Ballard Sealable electrical connector

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2864977A (en) * 1953-10-14 1958-12-16 Richard P Witt Plug-in packages
US3111352A (en) * 1959-11-16 1963-11-19 Ibm Superconductive solderless connector
FR1285352A (fr) * 1961-01-11 1962-02-23 Prise intercalaire pour coupe-circuit
US3208026A (en) * 1961-10-31 1965-09-21 Elco Corp Protector of printed circuit contacts
US3330004A (en) * 1963-11-04 1967-07-11 Nosco Plastics Hypodermic syringe
US3315217A (en) * 1965-03-19 1967-04-18 Elco Corp Connector for thin film circuits
US3539974A (en) * 1969-04-17 1970-11-10 Quentin Berg Header block assembly
US3649957A (en) * 1970-05-28 1972-03-14 Western Electric Co Electrical connector
US3742427A (en) * 1971-08-26 1973-06-26 A Ballard Sealable electrical connector

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4483577A (en) * 1982-01-07 1984-11-20 Novis Joseph R Electrical bridging connector and method of use
US4538877A (en) * 1982-01-07 1985-09-03 Novis Joseph R Electrical bridging connector with post separator housing
US4530557A (en) * 1982-12-15 1985-07-23 Sony Corporation Microminiature connector

Also Published As

Publication number Publication date
CA996649A (en) 1976-09-07
DE7221907U (de) 1972-10-12
HU168181B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1976-03-28
JPS5544428B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1980-11-12
RO69599A (ro) 1981-04-30
GB1437359A (en) 1976-05-26
JPS4956176A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-05-31
AU5637073A (en) 1974-12-05

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ALLIED CORPORATION COLUMBIA ROAD AND PARK AVENUE,

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BUNKER RAMO CORPORATION A CORP. OF DE;REEL/FRAME:004149/0365

Effective date: 19820922

AS Assignment

Owner name: CANADIAN IMPERIAL BANK OF COMMERCE, NEW YORK AGENC

Free format text: SECURITY INTEREST;ASSIGNOR:AMPHENOL CORPORATION;REEL/FRAME:004879/0030

Effective date: 19870515

AS Assignment

Owner name: AMPHENOL CORPORATION, LISLE, ILLINOIS A CORP. OF D

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ALLIED CORPORATION, A CORP. OF NY;REEL/FRAME:004844/0850

Effective date: 19870602

Owner name: AMPHENOL CORPORATION, A CORP. OF DE, ILLINOIS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ALLIED CORPORATION, A CORP. OF NY;REEL/FRAME:004844/0850

Effective date: 19870602

AS Assignment

Owner name: AMPHENOL CORPORATION A CORP. OF DELAWARE

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CANADIAN IMPERIAL BANK OF COMMERCE;REEL/FRAME:006147/0887

Effective date: 19911114