WO1999030175A1

WO1999030175A1 - An electrical contact assembly

Info

Publication number: WO1999030175A1
Application number: PCT/US1998/025905
Authority: WO
Inventors: Marthinus Johannes Sparks
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-12-08
Filing date: 1998-12-07
Publication date: 1999-06-17
Anticipated expiration: 2000-06-08
Also published as: ZA9711005B; AU1806899A

Abstract

An electrical contact assembly (10) is provided which includes a probe (12) and a housing (14) in which the probe (12) is selectively at least partially receivable. The probe (12) includes an electrically conductive contact member (16) for selectively making contact with an electrical cable, contact or the like. The housing (14) includes a holding formation (15) defining a holding zone (62) in which an electrical cable (64) is receivable. The contact member (16) is displaceable into an operative position in which it is positioned in the holding zone (62) to make electrical contact with the cable (64). The invention extends to a housing for an electrical contact assembly and to a probe.

Description

AN ELECTRICAL CONTACT ASSEMBLY

BACKGROUND OF THE INVENTION

THIS INVENTION relates to an electrical contact assembly. It also relates to a housing and a probe for use in the assembly.

Testing apparatus such as continuity testers are well known. Such apparatus may be in the form of a probe having a contact which is selectively located at various points in an electrical circuit to monitor continuity.

SUMMARY OF THE INVENTION

In accordance with the invention, there is provided an electrical contact assembly, which includes a probe including an electrically conductive contact member; and a housing in which the probe is selectively at least partially receivable, the housing including a holding formation defining a holding zone in which an electrical cable is receivable and the contact member being displaceable into an operative position in which it is positioned in the holding zone to make electrical contact with the cable.

The housing may include an end portion which defines the holding formation. The end portion may be shaped and dimensioned to facilitate penetration of a wiring harness thereby to enable a user to locate the cable in the holding formation. The end portion is typically tapered and defines a hook-like holding formation.

The holding formation may define a convex abutment surface which defines a terminal end of the holding zone and against which the cable abuts in use.

The housing may define at least one gripping formation shaped and dimensioned to facilitate gripping of the housing by a user. Typically, the assembly includes two concave gripping formations arranged in a syringe-like fashion. The gripping formations may protrude outwardly from an upper end of the housing.

The housing may include a locking member for locking the contact member in the operative position. Typically, the locking member is mounted pivotally to allow displacement into an operative position in which it frictionally engages the probe in such a fashion so as to retain the contact member in its operative position.

The probe may include a shaped body portion which is at least partially receivable within a complementary socket formation in the housing. The contact member may be mounted to a front end of the body portion and extend through the housing towards the holding zone.

The probe may include releasable mounting means for releasably mounting the contact member to the body portion. The contact member may be in the form of an elongate needle-like member. The releasable mounting means is typically in the form of an internal and external screw thread.

The body portion may include an outer component which is selectively received within the housing, and an inner component to which the contact member is mounted, and which is at least partially received within the outer component and displaceable relative to the outer component between a dormant position and an operative position in which the contact member is positioned in the holding zone.

The probe may include biassing means for biassing the inner component in its dormant position. The biassing means is typically in the form of a compression spring.

The inner component may define a hollow chamber arranged to receive electrical illumination means which has one terminal connectable to the contact member.

The inner component may be formed from at least a translucent material thereby to enable a user to monitor illumination of the electrical illumination means.

The housing may include reflection means for reflecting light emitted by the illumination means to facilitate detection thereof by a user.

The inner component may include a releasable closure member for retaining the illumination means within the hollow chamber.

The assembly may include a flexible lead connected to another terminal of the illumination means and including a releasable electrical clip for selective connection to an earth line.

Further in accordance with the invention, there is provided a housing for use in an electrical contact assembly as hereinbefore described, the housing being arranged selectively and removably at least partially to receive a probe and the housing including an end portion which defines a holding formation, the end portion being shaped and dimensioned to facilitate penetration of a wiring harness thereby to enable a user to locate a cable in the holding formation. The end portion is typically tapered and defines a hook-like holding formation.

The holding formation may define a convex abutment surface which defines a terminal end of a holding zone in which the cable is receivable and against which surface the cable abuts in use.

The housing may define at least one gripping formation shaped and dimensioned to facilitate gripping of the housing by a user. Typically, the housing defines two concave gripping formations arranged in a syringe-like fashion.

The housing may include a locking member for locking a contact member of the probe in an operative position in which it makes electrical contact with the cable.

The housing may include reflection means for reflecting light emitted by illumination means to facilitate detection thereof by a user.

Further in accordance with the invention, there is provided a probe for use in an electrical contact assembly as hereinbefore described, the probe including a body portion which is at least partially receivable within a housing, and a contact member mounted to a front end of the body portion and extending through the housing towards a holding zone defined by the housing for holding an electrical cable.

The probe may include releasable mounting means for releasably mounting the contact member to the body portion. The contact member may be in the form of an elongate needle-like member. Typically, the releasable mounting means is in the form of an internal and external screw thread.

The body portion may include an outer component which is selectively received within the housing and an inner component to which the contact member is mounted, and which is at least partially received within the outer component and displaceable relative to the outer component between a dormant position and an operative position in which the contact member makes electrical contact with an electrical cable in use.

The inner component is typically formed from a translucent material thereby to enable a user to monitor illumination of the electrical illumination means in use. In other embodiments, the inner component is formed from a generally transparent plastics material.

The probe may include a flexible lead connected to the illumination means in use and a releasable electrical clip for selective connection to an earth line.

The invention will now be described, by way of example, with reference to the accompanying diagrammatic drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

In the drawings, Figure 1 shows an exploded view of an electrical contact assembly in accordance with the invention;

Figure 2 shows a top plan view of the assembly of Figure 1 ; and Figure 3 shows a side view of the assembly of Figure 1 .

DETAILED DESCRIPTION

Referring to the drawings, reference numeral 10 generally indicates an electrical contact assembly in accordance with the invention. The assembly 10 includes a probe 1 2 which is selectively receivable within a housing 14. When the probe 1 2 is removed from the housing 14 it may be used in a conventional manner to test continuity or voltage in electrical circuits. However, when the probe 1 2 is received within the housing 14, the assembly 10 is suitable for maintaining electrical contact with an electrical cable or the like as described in more detail below.

The probe 1 2 is composite in nature and comprises an electrically conductive needle-like contact member 1 6 which is mounted to an inner component 20 which is slidingly received within the outer component 1 8. The inner component 20 includes an attachment protrusion 22 which extends through an aperture in a front face 28 of the outer component 1 8 for displacement as described in more detail below.

Biassing means in the form of a compression spring 24 is positioned over the attachment protrusion 22 and its one end abuts a front face 26 of the inner component 20, and its other end abuts the front face 28 of the outer component 1 8. In use, the inner component 20 is displaceable relative to the outer component 1 8 between a dormant position in which the inner component 20 is urged in the direction of arrow 30 and an operative position in which the inner component is urged in an opposite direction thereby to displace the contact member 1 6 forwardly relative to the outer component 1 8. The inner component 20 is moulded from a synthetic plastics material which is preferably translucent or substantially transparent and includes a hollow chamber in which illumination means in the form of a light bulb 32 is replaceably located. An electrically conductive contact pin 33 extends through the attachment protrusion 22 and its lower end 34 makes electrical contact with the contact member 1 6 and its upper end defines a head 36 which makes contact with a terminal 38 of the light bulb 32 via a compression spring 40. Typically, the contact member 16 is attached to the contact pin 33 by means of releasable mounting means defined by an internal and external screw thread arrangement. Accordingly, in the event of the contact member 1 6 being damaged, it may be replaced.

A closure member in the form of an internally screw- threaded cap 42 is screwed onto an externally screw-threaded formation 44 of the inner component 20 thereby to retain the light bulb 32 within the hollow chamber. A length of flexible cord 46 is connected to releasable attachment means in the form of a crocodile clip 48 for making electrical connection with an earth line, typically an earth line in a motor vehicle. The flexible cord 46 is in electrical contact with a terminal 50 of the light bulb 32 via a contact member 35. The inner component 20 is rectangular in cross-sectional outline and is received with clearance within a complementary formation defined in the outer component 1 8. The outer component 1 8 is also rectangular in cross-sectional outline and is shaped to be received within a complemental socket 52 of the housing 14 with a friction fit.

The housing 14 includes an elongate nose portion 54 which terminates in a holding formation 56. The holding formation 56 is tapered (see

Figures 2 and 3) and arranged to facilitate insertion thereof into a wiring harness.

The housing 14 includes two convex gripping formations 58, 60 (see Figures 1 and 3) which are shaped and dimensioned to facilitate gripping of the housing 1 4 by a user. The housing 14 is typically in the form of a unitary moulding of plastics material and the holding formation 56 defines a holding zone 62 (see Figures 2 and 3) for selectively holding an electrical cable_. 64 which typically forms part of a wiring harness. A terminal end of the holding zone 62 is defined by a convex abutment surface 66 against which the electrical cable 64 5 abuts in use. The abutment surface 66 is shaped to facilitate penetration of a needle-like end 68 of the contact member 1 6 through a plastics casing of sheath of the electrical cable 64 thereby to make electrical contact with a core of the cable 64.

The outer component 1 8 of the probe 1 2 is received within the

10 socket 52 with a friction fit and abuts an abutment formation 70 (see Figure 3) defined by the housing 14. When the probe 1 2 is received within the housing

14, relative displacement of the inner component 20 relative to the outer component 1 8 by exerting a longitudinal force in the direction of arrow 72 (see

Figure 3) on the cap 42 displaces the needle-like end 68 of the contact member

1 5 1 6 from a dormant position (as shown in solid lines in Figure 3) to an operative position (as shown in broken lines in Figure 3). In the dormant position, the needle-like end 68 is retracted within a body portion 74 of the housing 14 thereby to enable a user to position the cable 64 in the holding formation 62 in a hook-like fashion. In the operative position, the needle-like end 68 is displaced into the

20 holding zone 62 to make electrical contact with the cable 64.

In order to retain the contact member 1 6 in its operative position, a locking arrangement 76 (see Figures 1 and 3) is provided. The locking formation 76 includes a locking lever 78 which is pivoted to the gripping formation 60. The locking lever 78 is pivoted between an operative position (as shown in Figure 3) 5 in which it frictionally engages a friction pad 80 (see Figure 1 ) thereby to lock the inner component 20 in its forward position relative to the outer component 1 8 thereby to retain the needle-like end 68 in its operative position. Reflection means in the form of a convex metal mirror 82 is attached to an inner wall 84 of the gripping formation 58. In use, when the electrical contact assembly 10 is used,

30 for example, to perform tests on electrical cables located beneath a dashboard of a vehicle, the mirror 82 may reflect light emitted by the light bulb 32 generally in the direction shown by arrow 86 thereby to facilitate detection thereof by a user. Further, recesses 88, 90 provided in the housing 14 and outer component 1 8 respectively to facilitate viewing of the light bulb 32 by a user.

In use, the assembly 10 is typically used to test power on cables in a vehicle as mentioned above. The crocodile clip 48 is then connected to a negative line of the motor vehicle which, in turn, is connected to the light bulb 32 via the flexible cord 46. The probe 1 2 may be used as a stand-alone unit which may probe various points in an electrical circuit. In the event of the needle-like end 68 making contact with a positive supply line, the light bulb 32 is illuminated to provide an indication to a user. However, when it is desired fixedly to make contact with the electrical cable 64, the probe 1 2 is then inserted within the housing 1 4 and the cable 64 is captured by the holding formation 56 as shown in Figures 2 and 3. The needle-like end 68 may then be locked in its operative position in which it permanently makes contact with the electrical cable 64. Further, the capturing of the cable 64 by the assembly 10 is then facilitated by the shape of the holding formation 56.

The Applicant believes that the invention, as illustrated, provides a versatile electrical contact assembly 10 which may be used as a stand-alone probe 1 2 for testing electrical circuits, or the probe 1 2 may be removably inserted within the housing 1 4 thereby to enable the probe 1 2 to make permanent or continuous contact with the electrical cable 64.

Claims

I CLAIM:

1 . An electrical contact assembly, which includes a probe including an electrically conductive contact member; and a housing in which the probe is selectively at least partially receivable, the housing including a holding formation defining a holding zone in which an electrical cable is receivable and the contact member being displaceable into an operative position in which it is positioned in the holding zone to make electrical contact with the cable.

2. An assembly as claimed in Claim 1 , in which the housing includes an end portion which defines the holding formation, the end portion being shaped and dimensioned to facilitate penetration of a wiring harness thereby to enable a user to locate the cable in the holding formation.

3. An assembly as claimed in Claim 2, in which the end portion is tapered and defines a hook-like holding formation.

4. An assembly as claimed in Claim 2 or Claim 3, in which the holding formation defines a convex abutment surface which defines a terminal end of the holding zone and against which the cable abuts in use.

5. An assembly as claimed in any one of the preceding claims, in which the housing defines at least one gripping formation shaped and dimensioned to facilitate gripping of the housing by a user.

6. An assembly as claimed in Claim 5, which includes two concave gripping formations arranged in a syringe-like fashion.

7. An assembly as claimed in any one of the previous claims, in which the housing includes a locking member for locking the contact member in the operative position.

8. An assembly as claimed in Claim 7, in which the locking member is mounted pivotally to allow displacement into an operative position in which it frictionally engages the probe in such a fashion so as to retain the contact member in its operative position.

5 9. An assembly as claimed in any one of the preceding claims, in which the probe includes a shaped body portion which is at least partially receivable within a complementary socket formation in the housing, the contact member being mounted to a front end of the body portion and extending through the housing towards the holding zone.

1 0 1 0. An assembly as claimed in Claim 9, in which the probe includes releasable mounting means for releasably mounting the contact member to the body portion, the contact member being in the form of an elongate needle-like member.

1 1 . An assembly as claimed in Claim 10, in which the releasable 1 5 mounting means is in the form of an internal and external screw thread.

1 2. An assembly as claimed in any one of the preceding claims 9 to 1 1 inclusive, in which the body portion includes an outer component which is selectively received within the housing and an inner component to which the contact member is mounted, and which is at least partially received within the

20 outer component and displaceable relative to the outer component between a dormant position and an operative position in which the contact member is positioned in the holding zone.

1 3. An assembly as claimed in Claim 1 2, in which the probe includes biassing means for biassing the inner component in its dormant position.

25 14. An assembly as claimed in Claim 1 3, in which the biassing means is in the form of a compression spring.

1 5. An assembly as claimed in any one of the preceding claims 1 2 to 14 inclusive, in which the inner component defines a hollow chamber arranged to receive electrical illumination means which has one terminal connectable to the contact member.

1 6. An assembly as claimed in Claim 1 5, in which the inner component is formed from at least a translucent material thereby to enable a user to monitor illumination of the electrical illumination means.

1 7. An assembly as claimed in Claim 1 5 or Claim 1 6, in which the housing includes reflection means for reflecting light emitted by the illumination means to facilitate detection thereof by a user.

1 8. An assembly as claimed in any one of the preceding claims 1 5 to 1 7 inclusive, in which the inner component includes a releasable closure member for retaining the illumination means within the hollow chamber.

1 9. An assembly as claimed in any one of the preceding claims 1 5 to 1 8 inclusive, which includes a flexible lead connected to another terminal of the illumination means and including a releasable electrical clip for selective connection to an earth line.

20. A housing for use in an electrical contact assembly as claimed in any one of the preceding claims, the housing being arranged selectively and removably at least partially to receive a probe and the housing including an end portion which defines a holding formation, the end portion being shaped and dimensioned to facilitate penetration of a wiring harness thereby to enable a user to locate a cable in the holding formation.

21 . A housing as claimed in Claim 20, in which the end portion is tapered and defines a hook-like holding formation.

22. A housing as claimed in Claim 20 or Claim 21 , in which the holding formation defines a convex abutment surface which defines a terminal end of a holding zone in which the cable is receivable and against which surface the cable abuts in use.

5 23. A housing as claimed in any one of the preceding claims 20 to 22 inclusive, which defines at least one gripping formation shaped and dimensioned to facilitate gripping of the housing by a user.

24. A housing as claimed in Claim 23, which defines two concave gripping formations arranged in a syringe-like fashion.

1 0 25. A housing as claimed in any one of the preceding claims 20 to 24, which includes a locking member for locking a contact member of the probe in an operative position in which it makes electrical contact with the cable.

26. A housing as claimed in any one of the preceding claims 20 to 25 inclusive, in which the housing includes reflection means for reflecting light

1 5 emitted by illumination means to facilitate detection thereof by a user.

27. A probe for use in an electrical contact assembly as claimed in any one of the preceding claims 1 to 1 9 inclusive, the probe including a body portion which is at least partially receivable within a housing, and a contact member mounted to a front end of the body portion and extending through the housing

20 towards a holding zone defined by the housing for holding an electrical cable.

28. A probe as claimed in Claim 27, which includes releasable mounting means for releasably mounting the contact member to the body portion, the contact member being in the form of an elongate needle-like member.

29. A probe as claimed in Claim 28, in which the releasable mounting 25 means is in the form of an internal and external screw thread.

30. A probe as claimed in any one of the preceding claims 27 to 29 inclusive, in which the body portion includes an outer component which is selectively received within the housing and an inner component to which the contact member is mounted, and which is at least partially received within the outer component and displaceable relative to the outer component between a dormant position and an operative position in which the contact member makes electrical contact with an electrical cable in use.

31 . A probe as claimed in Claim 30, which includes biassing means for biassing the inner component in its dormant position.

32. A probe as claimed in Claim 31 , in which the biassing means is in the form of a compression spring.

33. A probe as claimed in any one of the preceding claims 30 to 32 inclusive, in which the inner component defines a hollow chamber arranged to receive electrical illumination means which has one terminal connectable to the contact member.

34. A probe as claimed in Claim 33, in which the inner component is formed from at least a translucent material thereby to enable a user to monitor illumination of the electrical illumination means in use.

35. A probe as claimed in Claim 33 or Claim 34, in which the inner component includes a releasable closure member for retaining the illumination means within the hollow chamber.

36. A probe as claimed in any one of the preceding claims 33 to 35 inclusive, which includes a flexible lead connected to the illumination means in use and a releasable electrical clip for selective connection to an earth line.