Space-saving insulation displacement type interconnect device for electrically coupling a ribbon connector to a printed circuit board

• US 5,188,536 A
• Filed: 03/16/1992
• Issued: 02/23/1993
• Est. Priority Date: 03/16/1992
• Status: Expired due to Term

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Compaq Computer Corporation (HP Inc.)
• Inventors: Ulery, Kirk D., Ganthier, James J.
• Primary Examiner(s): Bradley, Paula A.
• Application Number:
  US07/851,839
• Time in Patent Office: 344 Days
• Field of Search: 439/67, 439/76, 439/77, 439/83, 439/329, 439/391, 439/393, 439/395, 439/396, 439/401, 439/406, 439/409, 439/426, 439/427, 439/435, 439/440, 439/492, 439/493, 439/498, 439/499
• US Class Current: 439/83
• CPC Class Codes: H01R 12/675 with contacts having at least a slotted plate for penetration of cable insulation, e.g. insulation displacement contacts for round conductor flat cables
• CPC Class Codes: H01R 12/714 with contacts abutting directly the printed circuit; Button contacts therefore provided on the printed circuit

Abstract

A surface mountable insulation displacement type connector for electrically coupling an end portion of a connector ribbon to a spaced series of surface mounted electrically conductive contact pads on a printed circuit board has an elongated base portion through which the central body sections of a longitudinally spaced series of metal contactor pins transversely and slidably extend. The pin body sections have bifurcated, barbed top end portions disposed above a top side of the connector base portion, and transversely enlarged bottom end portions disposed below the bottom side of the base portion. The base portion is secured to the circuit board by soldering the bottom pin end portions to the baord contact pads, with the slidable mounting of the pin body sections automatically compensating for board surface height variations in the region of the surface contact pads. An elongated clamping portion of the connector is snapped onto the base portion to downwardly force the ribbon end portion onto the upper pin ends, thereby locking the ribbon end portion in place on the connector and causing the barbed portions of the upper pin ends to upwardly pierce the ribbon insulation and be brought into conductive contact with its spaced series of embedded electrically conductive wires.

Claims

1. A surface mountable, insulation displacement type connector device for electrically coupling a spaced series of contact pads formed on a side surface of a printed circuit board to an end portion of a connector ribbon having an outer insulation portion in which a spaced series of wires are embedded and extend parallel to the length of said outer insulation portion, said connector device comprising:

a base portion having a first side surface positionable over said contact pads, a second side surface, and a spaced series of openings extending transversely through said base portion from said first side surface to said second side surface;

a spaced series of electrically conductive connector pin members each having;

a longitudinally intermediate body portion received in one of said base portion openings, said longitudinally intermediate body portions of said connector pin members being slightly longer than the distance between said first and second side surfaces of said base portion and being slidably but nonrotatably received in said base portion openings,

a transversely enlarged connector section formed on one end of the pin body portion, projecting outwardly beyond said first side surface of said base portion, and being engageable with and conductively bondable to one of said contact pads, and

a bifurcated, transversely enlarged barbed portion formed on the opposite end of the pin body portion, projecting outwardly beyond said second side surface of said base portion, and adapted to pierce the insulation portion of the connector ribbon and conductively engage one of the wires embedded therein; and

clamping means for inwardly clamping the connecting ribbon end portion inwardly onto said bifurcated, barbed end portions of said connector pin members in a manner causing them to pierce the outer insulation portion of said connector ribbon and conductively engage end portions of the wires embedded therein.

2. The surface mountable, insulation displacement type connector device of claim 1 wherein said base portion openings and said longitudinally intermediate portions of said connector pin members have rectangular cross-sections along their lengths.

3. The surface mountable, insulation displacement type connector device of claim 1 wherein:

said circuit board has a spaced pair of alignment openings extending transversely therethrough, and

said base portion has a spaced pair of alignment pins projecting outwardly from said first side surface thereof, said alignment pins being insertable in said alignment openings to bring said connector portions of said connector pin members into operative registry with said contact pads on said printed circuit board.

4. The surface mountable, insulation displacement type connector device of claim 1 wherein:

said base portion has an elongated rectangular configuration with slots formed in opposite end portions thereof and extending inwardly through said second side surface thereof, and

said clamping means include an elongated rectangular clamping portion positionable over said base portion in a parallel relationship therewith, said clamping portion having an underside notch configured to transversely receive the connector ribbon end portion, and transverse, barbed end tabs configured to be lockingly inserted into said base portion slots.

5. The surface mountable, insulation displacement type connector device of claim 4 wherein:

said base portion has a pair of longitudinally outwardly projecting opposite end tabs, and

said slots are formed in said base portion end tabs.

6. Printed circuit board apparatus comprising:

a printed circuit board having a spaced series of electrically conductive contact pads formed on a side surface thereof;

a connector ribbon having an outer insulation portion in which a spaced series of electrically conductive wires are embedded and longitudinally extend parallel to the length of said outer insulation portion; and

an insulation displacement type connector device mounted on said side surface of said printed circuit board and electrically coupling the connector ribbon wires to said contact pads, said connector device including;

a base member overlying said contact pads and having a first side surface facing said contact pads, an oppositely facing second side surface, and a spaced series of openings aligned with said contact pads and extending through said base member between said first and second side surfaces thereof,

a series of electrically conductive connector pin members having longitudinally intermediate body portions received in said base member openings, said longitudinally intermediate body portions of said connector pin members being slightly longer than the distance between said first and second side surfaces of said base member and being slidably but nonrotatably received in said base member openings, transversely enlarged connector sections projecting outwardly beyond said first side surface of said base member and conductively bonded to said contact pads, and bifurcated, transversely enlarged barbed portions projecting outwardly beyond said second side surface of said base portion, and

a clamping member outwardly overlying said second side surface of said base member, said clamping member being secured to said base member and holding an end portion of said connector ribbon against said bifurcated, barbed portions of said connector pin members with said bifurcated, barbed portions piercing the connector ribbon end portion insulation and conductively engaging the wires embedded therein.

7. The printed circuit board apparatus of claim 6 wherein said base member openings and said longitudinally intermediate portions of said connector pin members have rectangular cross-sections along their lengths.

8. The printed circuit board apparatus of claim 6 wherein said printed circuit board has a spaced pair of alignment openings extending transversely therethrough, and

said base member has a spaced pair of alignment pins projecting outwardly from said first side surface thereof and received in said alignment openings.

9. The printed circuit board apparatus of claim 6 wherein:

said base member has an elongated rectangular configuration with slots formed on opposite end portions thereof and extending inwardly through said second side surface,

said openings are spaced apart along the length of said base member, and

said clamping member has an elongated rectangular configuration, an underside notch receiving said connector ribbon end portion, and transverse, barbed end tabs lockingly received in said base member slots.

10. The printed circuit board apparatus of claim 9 wherein:

said base member has a pair of longitudinally outwardly projecting opposite end tabs, and

said slots are formed in said base member end tabs.

11. A space-saving method of electrically coupling a connector ribbon to a spaced series of electrically conductive contact pads mounted on a side surface of a printed circuit board, said connector ribbon having an outer insulation portion in which a spaced series of electrically conductive wires are embedded and longitudinally extend parallel to the length of said outer insulation portion, said method comprising the steps of:

providing a base member having first and second opposite side surfaces, and a spaced series of openings each extending between said first and second side surfaces, said openings being aligned with said contact pads;

captively retaining longitudinally intermediate portions of a series of electrically conductive connector pin members in said openings, said connector pin members having transversely enlarged connector sections projecting outwardly beyond said first side surface of said base member, and bifurcated, transversely enlarged barbed portions projecting outwardly beyond said second side surface of said base member,

said longitudinally intermediate connector pin member portions having lengths slightly longer than the distance between said first and second side surfaces of said base member, and said captively retaining step being performed in a manner slidably but nonrotatably disposing said longitudinally intermediate connector pin member portions in said base member openings;

positioning said base member over said contact pads with said connector sections of said pin members in aligned engagement with said contact pads;

conductively bonding said connector sections of said pin members to said contact pads; and

pressing an end portion of said connector ribbon inwardly against said barbed portions of said connector pin members in a manner causing said barbed portions to pierce the insulation of said connector ribbon end portion and conductively engage the wires embedded therein.

12. The space-saving method of claim 11 wherein said step of slidably but nonrotatably disposing said longitudinally intermediate connector pin member portions in said base member openings includes the step of providing said base member openings and said longitudinally intermediate connector pin member portions with rectangular cross-sections along their lengths.

13. The space-saving method of claim 11 wherein said positioning step includes the steps of forming a spaced pair of alignment openings through said printed circuit board, forming a spaced pair of alignment pins on said base member, and inserting said alignment pins into said alignment openings.

14. The space-saving method of claim 11 wherein said conductively bonding step is performed using a soldering process.

15. The space-saving method of claim 11 wherein said base member has an elongated configuration and said pressing step includes the steps of:

forming slots in opposite end portions of said base member,

providing an elongated clamping member having an underside notch and a pair of barbed, transverse opposite end tabs,

placing said connector ribbon end portion in said notch, and

snapping said clamping member end tabs into said base member end slots.