KR900006538Y1 - Connector for 25 mil ribbon cable - Google Patents

Abstract

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Description

Connector for 25 mil ribbon cable

1A is a schematic diagram of a terminal before connection.

1B is a schematic diagram of the terminal after connection.

1C is a schematic diagram of a terminal after connection according to the prior art.

2 is a side view of the connector cut away.

3 is a top view of the connector.

4 is a cross-sectional view of the connector.

5 is a schematic diagram showing the stress distribution situation of the grooved plate.

* Explanation of symbols for main parts of the drawings

2: ribbon cable 4: wire

6: Insulator 8: Connector

10 housing 11 mating face

12: cable receiving surface 20: terminal

22: grooved plate 24: groove

25: internal shear cross section 26: groove bottom

28: wire accommodating part 30, 36, 42: external shear cross section

32: Point for penetrating the insulator 34: Transition part

40: base 44: middle

46: End of Match 47: Arm

48: web

The present invention relates to a ribbon cable having conductors arranged at narrow centerline spacing, in particular a connector for connecting a cable having a centerline spacing of 25 feet (one thousandth of an inch) while pushing the insulator.

Connectors that connect while pushing out the insulator of a ribbon cable are well known. They generally use housings with mating surfaces, opposite cable receiving surfaces and at least two rows of terminal receiving passages extending between the two surfaces. A plurality of mold-formed metal terminals are accommodated in each passage, each terminal having a rolled major surface and a sheared cross section and grooved in the mating direction and the cable receiving direction in the above-mentioned mating surface direction. It has a fine plate.

The slotted plate acts like two parallel beams.

The degree of deflection for a given force at a given point on the beam is a function of the width, thickness and properties of the material. As the contact gets smaller, their size must be carefully balanced to obtain the required force / bending ratio. If the width of the beam is reduced by 10%, the thickness of the material may need to be increased by 37% in order to obtain the same force / bending ratio. Simply using thicker and stronger materials may lead to difficulties in mold pressing the terminals into the required shape. As the centerline spacing of the ribbon cable is narrowed, problems with the design of the connector have been caused.

Micro-miniature D Connector was recently developed by ITT Cannon Electric Company to collectively terminate ribbon cables consisting of 30 gauge wires on 25 mil center lines. See Cabourne, Michael K.'s paper, "Group Termination for 25-Mill Flat Cables with Micro.D Connectors," presented at the 17th Annual Connector and Interconnect Technology Symposium in Anaheim, California, USA. Please. The published connectors have grooved plate-shaped terminals, each of which extends over the cable receiving surface to form a wire receiving portion and a base that enters each passage. The extending portion of the conductor receiving portion is an insulator penetrating point, and a straight line extending inclined in opposite directions from each point to the base portion forms an external shear cross section.

The base part likewise has an external shear cross section opposite to each other and extends obliquely in a straight line, and the straight line is in line with the external shear cross section of the prosthetic part.

The result is an inclined beam, which generates about 2.5 pounds of normal contact force when a 30-gauge twisted wire is in the prongs. However, the width between the outer shear surfaces at the locations where the wires are connected is considerably wider than the centerline spacing of the cable, resulting in the insulation of adjacent wires being pushed out. Therefore, sufficient contact force can be obtained, but there is a possibility of causing a short circuit between the conductors.

Therefore, in the present invention, the connector has a grooved plate-shaped terminal, which has a protruding part having external shear sections made opposite to each other at intervals similar to that of the center line of the conductor. The base part has an external shear cross section which is made opposite each other at a substantially larger distance than the conductor spacing. The transition portion between the lead wire receiving portion and the base portion is an outer shear cross section that is curved while drawing an arc from each outer shear cross section of the lead wire receiving portion to each outer shear cross section of the base portion.

The wide base and the transitions impart considerable force to the narrow prongs, allowing them to apply the required vertical contact force without destroying the insulation of adjacent conductors.

Figure 1a shows the terminal 20 of the present invention prior to connecting a ribbon cable 2 having a solid conductor 4 arranged in an insulating coating 6 at evenly spaced intervals, typically 25 mils. Indicates. The insulating coating 6 has a new groove 7, which is also arranged at uniform intervals as in the conducting wire 4. The terminal 20 is also suitable for a ribbon cable with twisted conductors and consists of a grooved plate 22 having a groove 24 formed by an inner shear end surface 25, the groove bottom 26 of which is a groove. Is enlarged for a more uniform stress distribution. The grooved plate 22 is composed of a protruding portion 28, a transition portion 34, and a base portion 40. The lead wire receiving portion 28 is defined by opposing parallel outer shear end face 30, which is arranged at the same uniform interval as the lead wire 4, and extends to be uniform as the lead wire 4 as well. The insulator penetrating point 32 which maintains a space | interval is reached. The transition portion 34 is delineated by an opposing external shear cross section 36 that bends in an arch form from the external shear cross section 30 to the corner 38. The base portion 40 consists of a parallel outer shear cross section 42 extending from the opposite corner 38. The corner 38 is arrange | positioned at the space | interval more than twice the space | interval of the conducting wire 4, and becomes 65 mils with respect to the cable which has the conducting wire of 25 mils space | interval.

FIG. 1B shows one conductor 4 housed in the groove 24, in which the insulator penetrating point 32 is accommodated in the middle of the longitudinal groove 7 so that the insulator of the adjacent conductor 4 is externally sheared. It is not pushed by 30 and lies on the arched outer shear section 36. The lead receptacle 28 maintains the vertical contact force with the force imparted by the base 40, which contrasts with the inclined design of the terminal 50 in the prior art as shown in FIG. 1C. Since the inclination between the base portion and the base of the terminal 50 in the prior art can obtain the required vertical contact force. However, the end 52 at the connecting position is wider than the lead spacing of the cable to be connected, so that for cables with 25 mil conductors, the end 52 at the connecting position is nearly 40 mils apart, as shown. Push out the insulator on the wire.

In Figures 2, 3 and 4 the connector 8 consists of a housing 10 of a molded insulator which extends between the mating face 11, the opposing cable receiving face 12 and between them. It has two rows of terminal accommodation passages 16. Adjacent aisles in each row have grooves 19 on the opposite sidewalls that receive grooved plates 22 so that the grooves 24 are twice the conductor spacing (50 mil spacing) in each row, as a whole. It is equal to (25 mils interval). The upright portion 14 helps to straighten the cable and has a web 15 for coverlatch as described in US Pat. No. 4,621,885. The terminals 20 are molded for left and right sides in the same press operation to stagger each other as shown. Each terminal 20 has a corner 43 stamped with a press, which is seated on the shoulder 18 of the terminal accommodation passage 16 so that the terminal is positioned up and down, and the groove is connected during the connecting operation. It serves to support the fine plate 22.

The grooved plate 22 is connected to the mating end 46 by an intermediate portion 44. The mating end 46 consists of a pair of arms 47 connected by a web 48 that is bent twice at right angles to form an adjacent arm and a rolled surface facing each other. do. Preferable material is beryllium copper having a thickness of 0.008.

5 is a stress distribution plot of the computer using finite element analysis. This figure shows the case where a 30-gauge, single-line conductor is accommodated in the groove 24, which expands from 0.005 inches to 0.008 inches. The pressure at the corner 43 corresponds to the shoulder 18 (FIG. 2). The internal isobars 66 to 7 represent the following stresses.

66 20998 psi

67 40946psi

68 60894psi

69 80842psi

70 100 790 psi

The foregoing description shows one embodiment of the present invention and is not intended to limit the scope of the following utility model registration claims to it.

Claims (11)

A housing 10 having a mating surface 11, a cable receiving surface 12 on the opposite side thereof, and at least two rows of terminal receiving passages 16 extending between the surfaces 11 and 12, each terminal being received in each passage; Is composed of a plurality of terminals (20) having a mating end 46 on the mating surface 11 side has a grooved plate 22 on the cable receiving surface 12 side, the grooved plate 22 Is composed of a bow portion 28, a transition portion 34, and a base portion 40 extending over the cable receiving surface 12 and passes through the bow portion 28 and the transition portion 34. It has a groove (24) leading to the inside of the base portion 40, the groove 24 has an inner shear end surface 25 facing each other, the termination is made while pushing the insulator of the ribbon cable (2) In the electrical connector, the external shear cross-sections 3 opposed to each other in which the bow portion 28 is spaced at about the same distance as the center line spacing of the leads 4. 0), the base portion 40 has an outer shear section 42 opposite each other that is wider than the guiding recess 28 and that is substantially larger than the centerline spacing of the leads and the base portion 40 is Starting near the middle along the groove depth, the transition part 34 is bent from each external shear end face 30 of the protruding part 28 to each external shear end face 42 of the base part 40. Consisting of an external shearing section 36, at least a portion of the transition section 34 extending over the cable receiving surface 12, the curved section when the transition section 34 terminates the ribbon cable 2 to the connector. Each groove at its end is adapted to receive an outer surface of the insulator covering the conductors adjacent to the conductors received in the fine plate 22 so that when the ribbon cable 2 is terminated to the connector, it is added from the base portion 40. To the conductors received in the grooves 24 by the An electrical connector, characterized in that the vertical contact force acts. The electrical connector according to claim 1, wherein the external shear end face (36) of the transition part (34) is curved in an arc shape. The electrical connector as claimed in claim 1, characterized in that the external shear section (30) of the bow portion (28) is parallel. 4. The outer shear end surface 30 of the bow portion 28 extends from the cable receiving surface 12 to a pair of insulator penetrating points 32, wherein the point is also in contact with the lead wire 4; Electrical connectors arranged at equal intervals. The method of claim 2 wherein the arc is generally quadrant. And the radius thereof is half of the centerline interval of the conductor. 6. The arc according to claim 5, wherein the arc is a quadrant of 90 degrees, and the outer shear section 42 of the base portion 40 is at least twice the interval of the outer shear section 30 of the pilot portion 28. An electrical connector, characterized in that apart. 7. The electrical connector according to claim 6, wherein the quadrant arcs have a common tangent, the common tangent in the same plane as the cable receiving surface (12). 2. The electrical connector according to claim 1, wherein the center line of the conductor is 25 mils and the space of the external shear sections 30 opposite to each other of the protruding portion 28 is 25 mils. 9. The electrical connector as claimed in claim 8, wherein an interval between the outer shear end surfaces (42) of the base portion (40) is 65 mils. 2. The electrical connector according to claim 1, wherein the grooved plates (22) are alternately arranged in four rows, so that the center lines of each row of the plates (22) are four times the spacing of the conductors (4). 12. The mating portion 46 of the terminal 20 is arranged in two rows, and the centerline spacing of the mating portions 46 is twice the spacing of the conducting wires 4 in each row. Electrical connector.