GB1560818A

GB1560818A - Electrical cannector with retaining clip

Info

Publication number: GB1560818A
Application number: GB2906377A
Authority: GB
Original assignee: Bunker Ramo Corp
Current assignee: Bunker Ramo Corp
Priority date: 1976-07-30
Filing date: 1977-07-11
Publication date: 1980-02-13
Also published as: DE2734333A1; JPS5317993A; FR2360190A1; BR7704771A

Description

(54 ELECTRICAL CONNECTOR WITH RETAINING CLIP (71) We, BUNKER RAMO CORPORATION, a Corporation organised and existing under the laws of the State of Delaware, United States of America, of 900 Commerce Drive, Oak Brook, Illinois, United States of America, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed to be particularly described in and by the following statement:- The invention relates to electrical connectors with retaining clips which may be opened to receive and closed to retain the mated electrical connectors. Retaining shoulders associated with the clips and connectors are such that they must be mated positively in a particular way indicative of the completion of good connections before the clips may be closed.

Electrical connectors which are mated to complete connections between separate electrical circuits generally consist of plug, or male, and receptacle, or female, parts which are held together by friction after being mated. Such electrical connectors include contact inserts which are frequently made flexible for application to a wide range of circuits including electrical brake circuits and the like and are likely to be damaged if subjected to extreme flexure or bending.

With such connectors there is a distinct possibility that a poor connection may be made at the time the parts are mated or that the parts will become partially or completely separated and therefore provide either a poor connection or a complete break in the connections. In some instances, sealing surfaces are provided on the mating insert members for environmental protection and incomplete mating can result in an ineffective seal.

Strain on wires or cables leading to the connectors may cause them to be bent causing a deterioration in individual wire seals or in the wires themselves.

Prior art connector housing members have been proposed in accordance with disclosures such as those shown in U.S. Patents number 3,030,601 and 3,344,393. However, these prior art disclosures have not included means for accepting only mated connector members or for providing a structure of nonelastomeric material with retention shoulders spaced apart a predetermined distance to serve as positive stops against movement of the connector members in an unmating direction. Consequently, they do not enable a determination to be made that connector members are completely mated at the time the housing is applied. Also, they do not provide positive interfaces between the housing and the connector such that the respective parts of the connector will not come unmated after the connector has been installed in the housing. It is noted also that the housings shown in the prior art do not provide a rigid body about the respective connectors to prevent flexible connectors from bending when subjected to bending forces.

According to the present invention there is provided a clip in combination with an electrical connector comprising mating connector members having when mated at least one pair of mated contact members disposed along a longitudinal axis and surrounding housing portions with outer retention surfaces spaced along said axis, the clip comprising: An axially extending body having open and closed states and extending in a closed state over an outer portion of each connector member for supporting said members, the body being of non-elastomeric material and including sloping retaining shoulders for engaging the outer retention surfaces of the connector members in closing the body about the connector members to urge the connector members toward a properly mating relation.

The clip should be sufficiently stiff in an axial direction of the connector members or mated contacts to prevent extreme flexure or bending of resilient connector members and damage to the inserts or contacts in addition to damage to any desired seals between the members.

In one embodiment the clip is of tubular construction including a wall with an inner perimeter forming a hollow interior for holding the mated connector members.

A slit along the axial length of the wall forms adjacent wall portions which can be separated so that the mated connector members can be inserted in a lateral movement into the hollow interior. The adjacent wall portions are then moved to close juxtaposition and latching means are provided for holding the clip in that closed position.

For holding the connector members in a mated condition, the clip includes axially spaced shoulders arranged as axial stops to be positioned adjacent shoulders on the connector members as the clip is closed about the connector. With connector members sized fo a particular clip, the shoulders on the clip are spaced a distance to accept only mated connector members. The shoulders are slightly tapered to develop mating pressures against the connector members as the clip is closed. Latching means are provided to retain the clip in a closed position with individual latches being positioned laterally adjacent the retention shoulders to retain them in the desired positions.

Advantageously, the clip is of one piece construction with an integral hinge formed opposite the axial slit to permit lateral opening and closing of the tubular members. The tubular members also may include axially extending arms on which cable ties can be fastened for strain relief of the conductors.

An embodiment of the invention will now be described, by way of example, with reference to the accompanying drawings, in which; FIGURE 1 is an expanded view of a connector of a kind of interest in the practice of this invention, FIGURE 2 shows a clip, according to the invention, as it appears in its open position before a connector is inserted, FIGURE 3 is a side view of the clip shown in FIGURE 2, FIGURE 4 is an end view of the clip shown in FIGURE 3, FIGURE 5 is a view in elevation of the clip of Figs 2 to 4, showing it in use to secure a connector and wiring to the connector, FIGURE 6 is a side view of the clip of FIGURE 5, FIGURE 7 is an end view of the clip according to FIGURE 6, and FIGURE 8 is a view of a portion of the clip in its open position showing a connector in position.

Turning now to the drawings, FIGURE 1 shows an expanded view of a connector of a type of interest in the practice of the invention described in U.S. Patent Specification No. 3,930,705 incorporated in this application by reference. As shown, the exemplary connector includes a receptacle or socket 1 and a plug 2, each of which includes a region 4 which may be referred to as a peripheral retaining shoulder.

FIGURE 8 is a view of an assembled connector with a plug 1 seated in a receptacle 2 with peripheral retaining shoulders 4 aligned as indicated. The line at J represents the joint between plug 2 and receptacle 1.

When the joint J is closed, the design of the plug and the connector is such that contacts therein will make good electrical connections. The peripheral retaining shoulders 4 are arranged so that they may be used, in a mating clip according to the invention, to gauge whether the joint J is properly closed without requiring close optical inspection.

The shoulders 4 may also be used in conjunction with suitable retaining means, forming a part of the inventive mating clip, to maintain the joint and therefore the connector in a closed condition following assembly of the clip to a connector.

FIGURE 2 shows a clip of non-elastomeric plastics in an open position ready to receive a mated connector. In this Figure, 12 and 13 are halves of a cylindrical or tubular body, which are interconnected by a flexible web at 8 that functions as a hinge.

The hinge makes it possible to shift the alignment between 12 and 13 by 180 degrees.

This capacity for change in relationships between the sections or segments 12 and 13 allows the segments to be arranged adjacent and parallel to each other as semi-cylindrical objects in what may be called the open position of FIGURES 2, 3 and 4. It also permits them to form a full cylindrical, or tubular, arrangement when the upper segment 12 is rotated about the hinge 8 to a rest position against the lower segment 13 in what may be called the closed position of the clip as shown in FIGURES 5, 6 and 7.

Associated with each segment of the clip in FIGURE 2 are a plurality of tapered retaining shoulders 3 which are provided to mate positively in an interference fit with connector peripheral retaining shoulders 4, shown in FIGURES 1 and 5. Elements 5 in FIGURE 2 are male interlock means which are provided to lock into female interlock means at 6 when the clip connector is in its closed position. Strain relief beams 9 are shown as integral parts of the mating clip.

The relief beams may be used with tie wraps to give added protection to electrical wiring and cables as is explained below in con nection with FIGURES 5 and 6.

FIGURE 3 is a side view of the mating clip of FIGURE 2 illustrating additional details of the clip molded of a non-elastomeric plastics such as polycarbonate. It will be seen that the female interlock means 6 includes a window 7. This window is accessible to the male interconnect means 5 and enables a lock to be established between interlock means 5 and 6. The strain relief beams 9 are shown to include undercut sections at 15 which receive and retain tie wraps when electrical wiring or a cable is supported by a relief beam.

FIGURE 4 is an end view of the mating clip of FIGURE 3 illustrating details of construction of a preferred embodiment. From this view the semi-cylindrical, or seini-tubu- lar, nature of the clip parts 12 and 13 will be clearer as is the fact that 12 and 13 are interconnected by a hinge 8 which is integral to them. From this view, too, it will be clearer how the male interlock means 5 fits into the window 7 of the female interlock means 6 to secure the mating clip in its closed position. As indicated, the elements 5, 6, 8, 9, 12 and 13 are integral to each other, but it will be recognized that they may be assembled together as individual parts, if desired.

FIGURE 5 is a view of a mating clip in its closed position to secure a mated connector formed by a plug 2 and a socket 1.

In this view the segment 12 of the mating clip is visible together with a hinge 8, relief beams 9, interlock means 5, 6, a connector 1, 2, electrical wiring 10 and a tie wrap 11.

FIGURE 6 is a side view in partial section of FIGURE 5. FIGURE 6 shows a connector mating clip which is secured in its closed position by means of the interlocking members 5 and 6. It will be seen that the female interlock means 6 is located on the lower partial cylinder 13 and is comprised of a double cantilever beam and crossmember forming a window 7 to accept a mating male member 5 which protrudes at a corresponding point from the upper partial cylinder 12. At the point of closure, sufficient force is applied to the upper and lower elements 12 and 13 to cause the female member 6 to deflect allowing the male member 5 to enter the window 7 formed by the female member.

With the male member 5 in position in the window 7, the female member 6 recovers to its approximate original position confining the male member and preventing the segments 12 and 13 from separating. The locking members 5 and 6 may be released and the segments 12 and 13 may be returned to the open position by inserting a hand tool, such as a screwdriver, between the female member 6 and the segment 12 causing the female member to deflect and release the male member 5 from the locking window 7.

With the mating clip in the open position of FIGURES 2, 3, 4, an electrical connector comprised of a mated plug 2 and receptacle 1 may be nested in either of the segments 12 or 13. To this end, the plug and connector each have peripheral retaining shoulders 4 which may be nested adjacent to and within the limits of corresponding tapered retaining shoulders 3 located in the segments 12 and 13.

Dimensional relationships between the mated connector pair 1 and 2, the peripheral retaining shoulders 4 and the mating clip retaining shoulders 3 are chosen such that a connector pair which is not fully mated will not nest within the limits of the mating clip retaining shoulders 3 due to excessive axial length across the connector pair retaining shoulders 4. This arrangement thereby prevents complete assembly of the mating clip with the connector pair and thereby indicates that the connector members 1 and 2 have not been fully mated.

When a correctly mated connector pair 1 and 2 is nested in either segment 12 or 13, the mating clip may be closed and locked to form a protective cylinder or shell around the connector mated pair thereby preventing excessive failure or bending of connector bodies 1 and 2 which might damage electrical contacts. With complete closure of the mating clip, the retaining shoulders 3 of the segments 12 and 13 provide positive 360 degree interfaces with the mating shoulders 4 of the connector mated pair 1 and 2. These 360 degree interfaces constitute interference fits between the tapered shoulders 3 and straight shoulders 4 which prevent accidental uncoupling of the connector due to shock, vibration or axial loading of electrical wiring such as that indicated at 10.

The strain relief beams 9 provide strain relief to electrical wiring such as that at 10.

The beams 9 may project from the outer radius of the lower segment 13 and extend axially outward from each end of segment 13. The beams are intended to prevent wires such as 10 from being laterally loaded which could cause critical connector wire seals 14 to be distorted and become non-functional.

An undercut 15 in the strain relief beam 9 is provided to accomodate the plastics tie 11 which mechanically confines the electrical wire 10 to the strain relief beam 9.

FIGURE 7 is an end view of an assembly according to FIGURE 6. In this view additional aspects of an exemplary assembly will be clear. Particular relationships between wiring 10, the plug 2, the strain relief beam 9 and the tie wrap 11 are shown.

In addition, it will be clearer how the male interlock means 5 and the female interlock means 6 are coupled. Also, it will be apparent that by inserting a screwdriver or other tool between the semi-cylinder 12 and the female means 6 leverage may be provided to enable the interlock means 6 to be pushed away from contact with the interlock means 5, thereby releasing the segments 12 and 13 so that they may be restored to their open position, as in FIGURE 2.

FIGURE 8 shows an embodiment of section 12 in which a connector formed by a socket 1 and plug 2 has been inserted in the section 12. The tapered shoulders 3 engage the peripheral retaining shoulders 4 of the connector mated pairs 1 and 2. The taper in the shoulder 3 is such that the shoulders 3 press against the shoulders 4 providing a positive fit between 3 and 4 which constitutes an interference fit which enables the mating clip to keep the connector closed and maintain good electrical contacts.

As represented by shoulders 3 in FIGURE 5, the retaining means for retaining mated connector members includes surfaces spaced for interfitting with the mated connector members whereby it is possible to determine whether the members forming the connector are mated or not. Shoulders 3 advantageously include radial surfaces with tapers to develop pressure in a mating direction between the connector members further preventing movement of the connector members in an unmating direction. In FIGURE 7, the conductors extending from the connector members lead to contacts as shown in the above-identified U.S. Patent Specification No. 3,930,705 with at least one pair of the contacts disposed along a longitudinal axis generally parallel to the longitudinal axis of the connector member and inserts for housing those contacts have outer retention surfaces spaced along the axis. The mating clip includes an axially extending body member extending over an outer portion of each connector member for supporting the members against extreme lateral flexing. The body member includes connector retaining means including surfaces spaced apart axially a predetermined distance for engagement with the retention surfaces of the connector members for preventing axial displacement of the members in a nonmating direction. Means are provided for holding the body member firmly against the connector members and the surfaces of the retaining means against the insert retention surfaces. Advantageously beam members as shown in FIGURES 6 and 7 are integrally formed on the body member and extend axially beyond the connector members for providing strain relief to conductors affixed to the connector members.

While the principles of the invention have been described above in connection with specific apparatus and applications, it is to be understood that this description is made only by way of example and not as a limitation on the scope of the invention.

WHAT WE CLAIM IS: 1. A clip in combination with an electrical connector comprising mating connector members having when mated at least one pair of mated contact members disposed along a longitudinal axis and surrounding housing portions with outer retention surfaces spaced along said axis, the clip comprising: An axially extending body having open and closed states and extending in a closed state over an outer portion of each connector member for supporting said members, the body being of non-elastomeric material and including sloping retaining shoulders for engaging the outer retention surfaces of the connector members in closing the body about the connector members to urge the connector members toward a properly mating relation.

2. A clip and connector according to claim 1 in which the retaining shoulders are inwardly opposed radial shoulders preventing axial displacement of the connector members.

3. A clip and connector according to claim 1 in which the body is generally cylindrical and the outer retention surfaces are circumferential grooves.

4. A clip and connector according to claim 3 in which the body is generally cylindrical in the closed state, and the angled retaining shoulders are inwardly opposed radial shoulders.

5. A clip and connector according to claim 1 including latch cements substantially aligned with the retaining shoulders for latching when said body is in its closed state, the latch elements resisting radially outward expansion of the body upon applying axial loading to the connector members.

6. A clip and connector according to claim 1 wherein the retaining shoulders extend substantially entirely about the connector members to make a positive interfer ence fit with the retention surfaces of the connector members.

7. A clip and connector substantially as hereinbefore described with reference to the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. other tool between the semi-cylinder 12 and the female means 6 leverage may be provided to enable the interlock means 6 to be pushed away from contact with the interlock means 5, thereby releasing the segments 12 and 13 so that they may be restored to their open position, as in FIGURE 2. FIGURE 8 shows an embodiment of section 12 in which a connector formed by a socket 1 and plug 2 has been inserted in the section 12. The tapered shoulders 3 engage the peripheral retaining shoulders 4 of the connector mated pairs 1 and 2. The taper in the shoulder 3 is such that the shoulders 3 press against the shoulders 4 providing a positive fit between 3 and 4 which constitutes an interference fit which enables the mating clip to keep the connector closed and maintain good electrical contacts. As represented by shoulders 3 in FIGURE 5, the retaining means for retaining mated connector members includes surfaces spaced for interfitting with the mated connector members whereby it is possible to determine whether the members forming the connector are mated or not. Shoulders 3 advantageously include radial surfaces with tapers to develop pressure in a mating direction between the connector members further preventing movement of the connector members in an unmating direction. In FIGURE 7, the conductors extending from the connector members lead to contacts as shown in the above-identified U.S. Patent Specification No. 3,930,705 with at least one pair of the contacts disposed along a longitudinal axis generally parallel to the longitudinal axis of the connector member and inserts for housing those contacts have outer retention surfaces spaced along the axis. The mating clip includes an axially extending body member extending over an outer portion of each connector member for supporting the members against extreme lateral flexing. The body member includes connector retaining means including surfaces spaced apart axially a predetermined distance for engagement with the retention surfaces of the connector members for preventing axial displacement of the members in a nonmating direction. Means are provided for holding the body member firmly against the connector members and the surfaces of the retaining means against the insert retention surfaces. Advantageously beam members as shown in FIGURES 6 and 7 are integrally formed on the body member and extend axially beyond the connector members for providing strain relief to conductors affixed to the connector members. While the principles of the invention have been described above in connection with specific apparatus and applications, it is to be understood that this description is made only by way of example and not as a limitation on the scope of the invention. WHAT WE CLAIM IS:

1. A clip in combination with an electrical connector comprising mating connector members having when mated at least one pair of mated contact members disposed along a longitudinal axis and surrounding housing portions with outer retention surfaces spaced along said axis, the clip comprising: An axially extending body having open and closed states and extending in a closed state over an outer portion of each connector member for supporting said members, the body being of non-elastomeric material and including sloping retaining shoulders for engaging the outer retention surfaces of the connector members in closing the body about the connector members to urge the connector members toward a properly mating relation.