WO2008083415A1 - Cap lamp cable attachment arrangement - Google Patents

Cap lamp cable attachment arrangement Download PDF

Info

Publication number
WO2008083415A1
WO2008083415A1 PCT/ZA2008/000001 ZA2008000001W WO2008083415A1 WO 2008083415 A1 WO2008083415 A1 WO 2008083415A1 ZA 2008000001 W ZA2008000001 W ZA 2008000001W WO 2008083415 A1 WO2008083415 A1 WO 2008083415A1
Authority
WO
WIPO (PCT)
Prior art keywords
cable
gland
plug
socket
component
Prior art date
Application number
PCT/ZA2008/000001
Other languages
French (fr)
Inventor
John Paul Mckelvey
Richard Dalbock
Original Assignee
John Paul Mckelvey
Richard Dalbock
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 John Paul Mckelvey, Richard Dalbock filed Critical John Paul Mckelvey
Priority to CN200880007215A priority Critical patent/CN101720519A/en
Publication of WO2008083415A1 publication Critical patent/WO2008083415A1/en

Links

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
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/46—Bases; Cases
    • H01R13/52—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases
    • H01R13/5219—Sealing means between coupling parts, e.g. interfacial seal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21L—LIGHTING DEVICES OR SYSTEMS THEREOF, BEING PORTABLE OR SPECIALLY ADAPTED FOR TRANSPORTATION
    • F21L4/00—Electric lighting devices with self-contained electric batteries or cells
    • F21L4/06—Electric lighting devices with self-contained electric batteries or cells with the light source coupled to the remainder of the device solely by cable
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/06—Arrangement of electric circuit elements in or on lighting devices the elements being coupling devices, e.g. connectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/62—Means for facilitating engagement or disengagement of coupling parts or for holding them in engagement
    • H01R13/622—Screw-ring or screw-casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/64—Means for preventing incorrect coupling

Definitions

  • This invention relates to a cable and an arrangement for releasably attaching the cable to a cap lamp and/or to its battery pack.
  • the light source in modern cap lamps is one or more high intensity light emitting diodes which are operated by control circuitry in the lamp housing.
  • the cap lamp battery pack includes charging microprocessor circuitry.
  • the cap lamp and its battery pack are connected to each other by a flexible cable the ends of which are releasably attached to the lamp and battery pack.
  • a cap lamp and battery pack cable attachment arrangement comprises a length of flexible cable which electrically connects the cap lamp to the battery pack, and a cable gland component on at least one end of the cable for releasably physically and electrically connecting the component to a complementary gland component on either the cap lamp or battery pack to provide a moisture-proof cable gland across the releasable connection.
  • Both ends of the cable may carry a cable gland component and both the cap lamp and the battery pack may include a complementary gland component for releasable attachment to the cable gland cable components.
  • the or each cable gland cable component may include a pair of electrical contact sockets which are each electrically attached to a cable conductor, a cylindrical plug of resiliently compressible material in which the contact sockets are partially embedded and which surrounds an end portion of the cable, the or each complementary gland component includes a cylindrical socket into which two electrical pins project in the axial direction of the socket and which are engageable in the electrical cable sockets when a cylindrical plug on the cable end is pressed into the socket and means for moving the cable gland components towards each other to radially expand the cable plug into moisture-sealing contact with the electrical connections in the gland.
  • the portion of the cable over which a portion of the compressible plug is located may be bonded to the plug and may include an outwardly projecting formation which extends across the interface between the cable and plug to inhibit the cable from being pulled from the plug.
  • the or each complementary gland component may include an internally threaded socket which is larger in diameter than and coaxial with the unthreaded pin socket and the cable gland moving means may be an externally threaded gland nut which is slidable on the cable and threadedly engageable with the complementary gland component socket and adapted to compress and so to radially expand the cable plug in the gland.
  • the or each cable gland may include mating key and keyway formations on the cable gland components to ensure the correct electrical orientation of the pins and pin sockets when the components of the gland are engaged with each other.
  • the key may project radially into and in the axial direction of the unthreaded socket of the complementary gland component with its keyway being located in the cylindrical body of the cable plug.
  • the key and its keyway may be longer than the length of the pins which project from the base of the unthreaded socket of the complementary gland component to ensure the correct orientation of the pins and pin sockets prior to their contact with each other.
  • the invention may additionally extend to the cable per se including the cable gland components which it carries.
  • Figure 1 is an isometric view of the cap lamp and its battery pack which are connected to each other by the power cable of the invention
  • Figure 2 is a sectioned side elevation of one end of the power cable of Figure 1 ,
  • Figure 3 is a sectioned side elevation of a female portion of the cable connector on both the cap lamp and its battery pack
  • Figure 4 is an end elevation of the cable of Figure 2
  • Figure 5 is a sectioned side elevation of the Figure 2 cable end connected to the Figure 3 cable connector.
  • Figure 1 illustrates a cap lamp 10 which is releasably located on a miner's hard hat in use, a battery pack 12 and a cable 14 physically and electrically connecting the battery pack to the lamp by means of cable connector glands shown generally at 16.
  • the cable 14, as shown in Figures 2 and 5, is a two-core flexible PVC cable which includes, adjacent each of its free ends, a metal crimp ring 18 which is partially embedded in the cable material.
  • Connector sockets 20 are electrically connected to the cable 14 conductors, as shown in Figures 2 and 5.
  • the cable gland 16 includes a cylindrical plug 22 which is made from a suitable resiliency compressible thermoplastics material which is injection moulded onto the outer surface of the cable 14 over the crimp ring 18 and the connector sockets, and a gland nut 24 which is slidably located on the cable 14.
  • the opposite end of the cable 14 and its various components are identical to those shown in Figures 2, 4 and 5.
  • Both the cap lamp 10 and the battery pack 12 include a female cable connector 26, as shown in Figure 3, which is complementary to the cable 14 gland components and is made integral with the housings of the cap lamp and battery pack, as shown in Figure 1.
  • the complementary female connector 26 is shown in Figure 3 to include a threaded socket 28 which is open to the outside of the lamp and battery housings, in which the cable gland nut 24 is threadedly engageable and a coaxial unthreaded socket 30 into which the connector pins 32, which are connected to the relevant electrical circuitry in the lamp and battery pack housings, project.
  • the socket 30 of the connector 26 includes a radially inwardly projecting key 34 which extends in an axial direction further into the socket 30 than the pins 32, as shown in Figure 3.
  • the key 34 is, in use, slidably engaged in a keyway 36 slot in the compressible cable gland plug 22 when it is inserted into the socket 30 of the female connector 26. When doing so it is obviously necessary that the key 34 and its keyway 36 are axially aligned to correctly electrically orient the cable connector DC sockets 20 with the connector pins 32 prior to the connector pins 32 coming into contact with the cable sockets 20.
  • the length of the cable gland plug 22 is a little greater than the distance separating the surfaces of the bases of the socket 30 of the female connector 26 and the gland nut 24 when the gland nut is fully engaged in the connector 26 socket.
  • the cable gland nut 24 is slid rearwardly on the cable from the position shown in Figure 2.
  • the gland compression plug 22 on the cable 14 is then inserted into the socket 30 of the female connector 26 on whichever of the cap lamp 10 or battery pack 12 is being connected to the cable with the key 34 of the connector 26 located in the compression plug keyway 36 and the pins 32 in the cable pin sockets 20.
  • the gland nut is then slid back towards the rear end of the compression plug 22 and screwed into the female connector socket 22 to cause the plug 22 to be radially expanded into pressure contact with the inner surfaces of the socket 30 and the gland nut 24 effectively to seal the cable connections against the passage of moisture across the gland.
  • the cable glands 16 are protected by the crimp rings 18, which are positively squeezed in the gland between the cable 14 and the compression member 22 by radial pressure, to guard against separation of the compression member 22 from the cable 14 which otherwise might occur by undue tension being applied to the cable.
  • the invention is not limited to the precise details as described above and one end of the cable 14 could be sealingly permanently engaged with the cap lamp or battery pack with only the remaining end of the cable and whichever of the cap lamp or battery pack to which it is to be connected including the female gland component.

Abstract

This invention relates to a cap lamp and battery pack cable attachment arrangement which includes a length of flexible cable which electrically connects the cap lamp to the battery pack, and a cable gland component on at least one end of the cable for releasably physically and electrically connecting the component to a complementary gland component on either the cap lamp or battery pack to provide a moisture-proof cable gland across the releasable connection.

Description

CAP LAMP CABLE ATTACHMENT ARRANGEMENT
FIELD OF THE INVENTION
[0001] This invention relates to a cable and an arrangement for releasably attaching the cable to a cap lamp and/or to its battery pack.
BACKGROUND TO THE INVENTION
[0002] The light source in modern cap lamps is one or more high intensity light emitting diodes which are operated by control circuitry in the lamp housing. The cap lamp battery pack includes charging microprocessor circuitry.
[0003] The cap lamp and its battery pack are connected to each other by a flexible cable the ends of which are releasably attached to the lamp and battery pack.
[0004] In deep level underground mines miners work in a hostile high temperature and humid environment in which moisture may destructively come into contact with the electric circuitry in both the cap lamps and their battery packs through the removable cable connections connecting the two together.
OBJECT OF THE INVENTION
[0005] It is the object of this invention to provide a cable and a moisture-proof arrangement for releasably attaching the cable to a miner's cap lamp and/or to its battery pack. SUMMARY OF THE INVENTION
[0006] A cap lamp and battery pack cable attachment arrangement according to the invention comprises a length of flexible cable which electrically connects the cap lamp to the battery pack, and a cable gland component on at least one end of the cable for releasably physically and electrically connecting the component to a complementary gland component on either the cap lamp or battery pack to provide a moisture-proof cable gland across the releasable connection.
[0007] Both ends of the cable may carry a cable gland component and both the cap lamp and the battery pack may include a complementary gland component for releasable attachment to the cable gland cable components.
[0008] The or each cable gland cable component may include a pair of electrical contact sockets which are each electrically attached to a cable conductor, a cylindrical plug of resiliently compressible material in which the contact sockets are partially embedded and which surrounds an end portion of the cable, the or each complementary gland component includes a cylindrical socket into which two electrical pins project in the axial direction of the socket and which are engageable in the electrical cable sockets when a cylindrical plug on the cable end is pressed into the socket and means for moving the cable gland components towards each other to radially expand the cable plug into moisture-sealing contact with the electrical connections in the gland.
[0009] The portion of the cable over which a portion of the compressible plug is located may be bonded to the plug and may include an outwardly projecting formation which extends across the interface between the cable and plug to inhibit the cable from being pulled from the plug.
[0010] The or each complementary gland component may include an internally threaded socket which is larger in diameter than and coaxial with the unthreaded pin socket and the cable gland moving means may be an externally threaded gland nut which is slidable on the cable and threadedly engageable with the complementary gland component socket and adapted to compress and so to radially expand the cable plug in the gland.
[0011] The or each cable gland may include mating key and keyway formations on the cable gland components to ensure the correct electrical orientation of the pins and pin sockets when the components of the gland are engaged with each other.
[0012] The key may project radially into and in the axial direction of the unthreaded socket of the complementary gland component with its keyway being located in the cylindrical body of the cable plug.
[0013] The key and its keyway may be longer than the length of the pins which project from the base of the unthreaded socket of the complementary gland component to ensure the correct orientation of the pins and pin sockets prior to their contact with each other.
[0014] The invention may additionally extend to the cable per se including the cable gland components which it carries. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The cap lamp and battery cable attachment arrangement together with the cable of the invention are now described by way of non-limiting examples only with reference to the drawings in which :
Figure 1 is an isometric view of the cap lamp and its battery pack which are connected to each other by the power cable of the invention,
Figure 2 is a sectioned side elevation of one end of the power cable of Figure 1 ,
Figure 3 is a sectioned side elevation of a female portion of the cable connector on both the cap lamp and its battery pack,
Figure 4 is an end elevation of the cable of Figure 2, and
Figure 5 is a sectioned side elevation of the Figure 2 cable end connected to the Figure 3 cable connector.
DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS
[0016] Figure 1 illustrates a cap lamp 10 which is releasably located on a miner's hard hat in use, a battery pack 12 and a cable 14 physically and electrically connecting the battery pack to the lamp by means of cable connector glands shown generally at 16.
[0017] The cable 14, as shown in Figures 2 and 5, is a two-core flexible PVC cable which includes, adjacent each of its free ends, a metal crimp ring 18 which is partially embedded in the cable material. Connector sockets 20 are electrically connected to the cable 14 conductors, as shown in Figures 2 and 5. [0018] The cable gland 16 includes a cylindrical plug 22 which is made from a suitable resiliency compressible thermoplastics material which is injection moulded onto the outer surface of the cable 14 over the crimp ring 18 and the connector sockets, and a gland nut 24 which is slidably located on the cable 14. The opposite end of the cable 14 and its various components are identical to those shown in Figures 2, 4 and 5.
[0019] Both the cap lamp 10 and the battery pack 12 include a female cable connector 26, as shown in Figure 3, which is complementary to the cable 14 gland components and is made integral with the housings of the cap lamp and battery pack, as shown in Figure 1.
[0020] The complementary female connector 26 is shown in Figure 3 to include a threaded socket 28 which is open to the outside of the lamp and battery housings, in which the cable gland nut 24 is threadedly engageable and a coaxial unthreaded socket 30 into which the connector pins 32, which are connected to the relevant electrical circuitry in the lamp and battery pack housings, project.
[0021] Importantly, the socket 30 of the connector 26 includes a radially inwardly projecting key 34 which extends in an axial direction further into the socket 30 than the pins 32, as shown in Figure 3.
[0022] The key 34 is, in use, slidably engaged in a keyway 36 slot in the compressible cable gland plug 22 when it is inserted into the socket 30 of the female connector 26. When doing so it is obviously necessary that the key 34 and its keyway 36 are axially aligned to correctly electrically orient the cable connector DC sockets 20 with the connector pins 32 prior to the connector pins 32 coming into contact with the cable sockets 20. [0023] The length of the cable gland plug 22 is a little greater than the distance separating the surfaces of the bases of the socket 30 of the female connector 26 and the gland nut 24 when the gland nut is fully engaged in the connector 26 socket.
[0024] To connect the cable 14 to either the cap lamp 10 or the battery pack 12 or both, the cable gland nut 24 is slid rearwardly on the cable from the position shown in Figure 2. The gland compression plug 22 on the cable 14 is then inserted into the socket 30 of the female connector 26 on whichever of the cap lamp 10 or battery pack 12 is being connected to the cable with the key 34 of the connector 26 located in the compression plug keyway 36 and the pins 32 in the cable pin sockets 20. The gland nut is then slid back towards the rear end of the compression plug 22 and screwed into the female connector socket 22 to cause the plug 22 to be radially expanded into pressure contact with the inner surfaces of the socket 30 and the gland nut 24 effectively to seal the cable connections against the passage of moisture across the gland.
[0025] To release the cable from the cap lamp or battery pack or both the gland nuts are merely unscrewed from the connections 26 and the cable ends withdrawn from the sockets 30 in the female connectors 26.
[0026] With the cable 14 connecting the cable lamp 10 to the battery pack 12 the cable glands 16 are protected by the crimp rings 18, which are positively squeezed in the gland between the cable 14 and the compression member 22 by radial pressure, to guard against separation of the compression member 22 from the cable 14 which otherwise might occur by undue tension being applied to the cable. [0027] The invention is not limited to the precise details as described above and one end of the cable 14 could be sealingly permanently engaged with the cap lamp or battery pack with only the remaining end of the cable and whichever of the cap lamp or battery pack to which it is to be connected including the female gland component.

Claims

1. A cap lamp and battery pack cable attachment arrangement comprising a length of flexible cable which electrically connects the cap lamp to the battery pack, and a cable gland component on at least one end of the cable for releasably physically and electrically connecting the component to a complementary gland component on either the cap lamp or battery pack to provide a moisture-proof cable gland across the releasable connection.
2. A cable attachment arrangement as claimed in claim 1 wherein both ends of the cable carry a cable gland component and both the cap lamp and the battery pack include a complementary gland component for releasable attachment to the cable gland cable components.
3. A cable attachment arrangement as claimed in either one of claims 1 or 2 wherein the or each cable gland cable component includes a pair of electrical contact sockets which are each electrically attached to a cable conductor, a cylindrical plug of resiliency compressible material in which the contact sockets are partially embedded and which surrounds an end portion of the cable, the or each complementary gland component includes a cylindrical socket into which two electrical pins project in the axial direction of the socket and which are engageable in the electrical cable sockets when a cylindrical plug on the cable end is pressed into the socket and means for moving the cable gland components towards each other to radially expand the cable plug into moisture-sealing contact with the electrical connections in the gland.
4. A cable attachment arrangement as claimed in claim 3 wherein the portion of the cable over which a portion of the compressible plug is located is bonded to the plug and includes an outwardly projecting formation which extends across the interface between the cable and plug to inhibit the cable from being pulled from the plug.
5. A cable attachment arrangement as claimed in claim 4 wherein the or each complementary gland component includes an internally threaded socket which is larger in diameter than and coaxial with the unthreaded pin socket and the cable gland moving means is an externally threaded gland nut which is slidable on the cable and threadedly engageable with the complementary gland component socket and adapted to compress and so to radially expand the cable plug in the gland.
6. A cable attachment arrangement as claimed in any one of claims 3 to 5 wherein the or each cable gland includes mating key and keyway formations on the cable gland components to ensure the correct electrical orientation of the pins and pin sockets when the components of the gland are engaged with each other.
7. A cable attachment arrangement as claimed in claim 6 wherein the key projects radially into and in the axial direction of the unthreaded socket of the complementary gland component with its keyway being located in the cylindrical body of the cable plug.
8. A cable attachment arrangement as claimed in claim 7 wherein the key and its keyway are longer than the length of the pins which project from the base of the unthreaded socket of the complementary gland component to ensure the correct orientation of the pins and pin sockets prior to their contact with each other.
PCT/ZA2008/000001 2007-01-04 2008-01-04 Cap lamp cable attachment arrangement WO2008083415A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN200880007215A CN101720519A (en) 2007-01-04 2008-01-04 Cap lamp cable attachment arrangement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA2007/00111 2007-01-04
ZA200700111 2007-01-04

Publications (1)

Publication Number Publication Date
WO2008083415A1 true WO2008083415A1 (en) 2008-07-10

Family

ID=39402734

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ZA2008/000001 WO2008083415A1 (en) 2007-01-04 2008-01-04 Cap lamp cable attachment arrangement

Country Status (3)

Country Link
CN (1) CN101720519A (en)
WO (1) WO2008083415A1 (en)
ZA (1) ZA200800009B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3173677A3 (en) * 2015-11-06 2017-08-30 LED Lenser Corp., Ltd. Apparatus and system for a multi-modal flashlight

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3945701A (en) * 1973-04-09 1976-03-23 Norddeutsche Seekabelwerke Ag Water-tight connectors for electric cables
EP0121292A1 (en) * 1983-03-31 1984-10-10 Levitt-Safety Limited Miner's lamp power pack recharging
DE20004566U1 (en) * 2000-03-11 2000-06-08 Dbt Autom Gmbh Plug connection for the cable connection in underground mining
DE10141052A1 (en) * 2001-08-22 2003-04-03 Dbt Automation Gmbh Essen Plug-in connection for a cable connector has a socket part and a plug-in part with a cable insert hole on its rear side for plugging into the socket part on-axis.
EP1465295A1 (en) * 2003-01-30 2004-10-06 Ben Fan Waterproof assembly for ornamental light string

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3945701A (en) * 1973-04-09 1976-03-23 Norddeutsche Seekabelwerke Ag Water-tight connectors for electric cables
EP0121292A1 (en) * 1983-03-31 1984-10-10 Levitt-Safety Limited Miner's lamp power pack recharging
DE20004566U1 (en) * 2000-03-11 2000-06-08 Dbt Autom Gmbh Plug connection for the cable connection in underground mining
DE10141052A1 (en) * 2001-08-22 2003-04-03 Dbt Automation Gmbh Essen Plug-in connection for a cable connector has a socket part and a plug-in part with a cable insert hole on its rear side for plugging into the socket part on-axis.
EP1465295A1 (en) * 2003-01-30 2004-10-06 Ben Fan Waterproof assembly for ornamental light string

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3173677A3 (en) * 2015-11-06 2017-08-30 LED Lenser Corp., Ltd. Apparatus and system for a multi-modal flashlight
AU2016250334B2 (en) * 2015-11-06 2018-05-17 Led Lenser Corp. Ltd. Apparatus and system for a multi-modal flashlight

Also Published As

Publication number Publication date
CN101720519A (en) 2010-06-02
ZA200800009B (en) 2009-08-26

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