EP0285349A2 - Taschensicherheitsleuchte - Google Patents

Taschensicherheitsleuchte Download PDF

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Publication number
EP0285349A2
EP0285349A2 EP88302723A EP88302723A EP0285349A2 EP 0285349 A2 EP0285349 A2 EP 0285349A2 EP 88302723 A EP88302723 A EP 88302723A EP 88302723 A EP88302723 A EP 88302723A EP 0285349 A2 EP0285349 A2 EP 0285349A2
Authority
EP
European Patent Office
Prior art keywords
torch
switching
compartment
lamp
portions
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP88302723A
Other languages
English (en)
French (fr)
Other versions
EP0285349A3 (de
Inventor
John Newton Maurice Jackson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WOLF SAFETY LAMP Co Ltd
Original Assignee
WOLF SAFETY LAMP Co Ltd
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 WOLF SAFETY LAMP Co Ltd filed Critical WOLF SAFETY LAMP Co Ltd
Publication of EP0285349A2 publication Critical patent/EP0285349A2/de
Publication of EP0285349A3 publication Critical patent/EP0285349A3/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F21V25/00—Safety devices structurally associated with lighting devices
    • F21V25/12—Flameproof or explosion-proof arrangements
    • 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
    • F21L4/005—Electric lighting devices with self-contained electric batteries or cells the device being a pocket lamp
    • 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
    • F21V14/00—Controlling the distribution of the light emitted by adjustment of elements
    • F21V14/02—Controlling the distribution of the light emitted by adjustment of elements by movement of light sources
    • F21V14/025—Controlling the distribution of the light emitted by adjustment of elements by movement of light sources in portable lighting devices
    • 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
    • F21V15/00—Protecting lighting devices from damage
    • F21V15/01—Housings, e.g. material or assembling of housing parts
    • 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
    • F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
    • F21V23/0414—Arrangement of electric circuit elements in or on lighting devices the elements being switches specially adapted to be used with portable lighting devices
    • 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
    • F21V31/00—Gas-tight or water-tight arrangements
    • F21V31/005—Sealing arrangements therefor

Definitions

  • the present invention relates to safety torches.
  • Safety torches are intended for use in hazardous, particularly potentially explosive atmospheres, and find use in, for example, the gas industry, the petroleum industry, the fire-fighting service and the like. Some electrical switching processes may involve some spark which could, if not contained or be rendered intrinsically safe, initiate an explosion in such an atmosphere. Sources of heat must be similarly contained. Thus, stringent regulations have been set out for safety torches. These are presently embodied in British Standards BS 4683 and BS 5501 and European Standard EN 50.
  • Such torches which term is intended to encompass any portable or wearable light source, or even a fixed lamp, are generally constructed of plastics material which should be substantially unbreakable even in various extremes of temperature and other conditions. Any external parts which must be of metal are of spark free material to avoid sparks should the torch be dropped.
  • This separation of the two compartments has another advantage in that the requirements for a separate battery compartment are less stringent than for a compartment containing a bulb and switch.
  • Each compartment must be subjected to an impact test following which the switch containing compartment must pass a test (under low vacuum) in which a harmful level of dust or moisture must not enter.
  • the battery compartment may even be holed, providing the hole is sufficiently small to deny access to the interior of an operator's finger.
  • Another advantage of the present invention is that the beam pattern of the torch may be varied without prejudicing the sealed integrity of the unit.
  • a safety torch having a battery compartment and a sealed, in use, switching and lamp compartment separable therefrom, and electrically connected thereto by fixed connections passing sealingly through a common wall of the two compartments.
  • the switching and lamp compartment is openable but automatically sealingly lockable, and a tool may be provided to enable the lock to be opened.
  • the lamp provided within the switching compartment may be withdrawn only when the seal has been unlocked.
  • the switching and lamp compartment is considered to be an "increased safety" enclosure and the battery compartment an “intrinsic safety” enclosure.
  • Switching the lamp on or off may be accomplished by relative movement between two parts of the switching compartment.
  • Said two relatively movable parts may be separated upon unlocking.
  • the relative movement may be relative rotation or pivoting.
  • the relative movement may, in addition to switching the lamp on or off, also cause movement of the lamp or one part of the switching compartment relative one to the other, whereby the beam pattern of light emitted may be varied.
  • the beam pattern may be variable from a narrow concentrated beam to a widely angled beam, or any beam pattern in between.
  • the switching compartment may incorporate substantially parabolic reflector means surrounding the lamp, located such that the lamp is substantially at the focus of the parabola to give said narrow beam and not at the focus to give said widely angled beam.
  • a safety torch having two relatively rotatable portions for switching the torch on and off, and also to give, when on, a variation in beam pattern, said two portions being sealingly lockable to prevent their separation except upon operation of an unlocking tool.
  • the two portions may be separated to allow changeover of the lamp.
  • the two portions may form together a sealed switching compartment of the torch which may be connected to a separable battery or power compartment.
  • a safety torch comprising a battery compartment 1 and a switching compartment 2.
  • the switching compartment is itself composed of a head portion 3 and a lens ring portion 4, the inter-relationship of which will be described in more detail below.
  • the battery compartment 1 comprises a cylinder 5, screw-threaded at one end to join with the switching compartment 2 and at the other closed by a cap 6, having a hanging loop 7, the cap being preferably joined to the cylinder 5 by adhesive or welding. Access to the interior of the battery compartment 1 may be obtained by unscrewing it from the switching compartment 2.
  • the exterior and interior of the battery compartment 1 are conventional, except that there is no switch as is often found in other torches.
  • the batteries which may be one or more in number (two being shown for convenience) are biased upwardly (as seen in Figure 1) by spring 8, which acts as one contact, into engagement with a second contact 9 on the exterior surface of the switching compartment where it forms a common wall 33 with the battery compartment.
  • contact 9 extends to an edge wall of the head portion 3 and connects to the interior of the head portion by means of stud 10.
  • Spring 8 acting as the other contact of the batteries is connected to stud 11 which passes through the common wall 33 into the interior of the switch compartment.
  • the switch compartment 2 comprises, as stated above, a lens ring portion 4 and a head portion 3, which are rotatable with respect one to the other, at least through a portion of a full rotation.
  • Lens ring portion 4 comprises a lens 12 and coverplate 13 (which may optionally be replaced by a simple coverplate) sealed to the rim of the lens ring.
  • coverplate 13 Within the coverplate 13 is a parabolic reflector 14 having an aperture on its axis of rotation to allow insertion of a lamp 15.
  • an annular cam follower holder 16 Rearwardly, referring to the direction of emitted light, of the reflector 14 is an annular cam follower holder 16, the purpose of which will be explained in more detail below.
  • the lens ring portion comprises a pair of outwardly directed locking dogs 17 (see Figure 2) for connecting the lens ring portion 4 with the head portion 3.
  • the head portion 3 comprises a screwthreaded extension for connection to the battery compartment 1 and a pair of inwardly directed locking dogs 18 for connection with the lens ring portion 4.
  • the locking mechanism is shown in Figure 3, which is drawn from the opposite side to the views of Figure 2 and thus clockwise rotation tends towards the unlocking position.
  • a short length of spring metal 21 is attached to the lens ring portion 4 to bear against the inside surface of the head portion 3, which is provided at one point with a locking abutment 22 adjacent a through hole 23.
  • the remote end of the spring 21 lies beyond the locking abutment 22 and the two portions may be assembled.
  • the remote end of spring 21 passes the locking abutment 22 and thereafter the two portions remain locked by the dogs.
  • a die cast metallic, and therefore electrically conductive, double cam plate 26 held in position by means of the stud 11 and another stud 25. It is thus connected to the negative terminal of the batteries through stud 11.
  • the cam plate 26 comprises a pair of cams 27 rising in an anti-clockwise direction as seen in Figure 4. Disposed around a portion of the periphery of the cam plate 26 is a pair of abutments 28 of plastics material or other non-conductive material.
  • a double arm cam follower 29 held for rotation with lens ring portion 4 by means of cam follower holder 16 is biased towards cam plate 26 by means of spring 30.
  • Cam follower 29 is of conductive material and connects with the negative terminal of the lamp 15.
  • the ends of the cam follower 29 are supported by the non-­conducting abutments 28 and thus the lamp is not illuminated.
  • the cam follower 29 passes from the non-­conducting abutments 28 and contacts the cams 27 thus ensuring electrical continuity but at a point where the cams 27 are at a high position.
  • the centre of the lamp 15 held via the cam follower 29 is located forwardly of the focus of the parabolic reflector 14 and a wide angled beam of light results.
  • the cam follower 29 goes down the slopes of the cams 27 and thereby retracts the lamp 15 towards the parabolic reflector.
  • the centre of the bulb 15 is adapted to be substantially at the focus of the parabolic reflector, and a narrow concentrated beam of light results.
  • the light beam may be of varying form.
  • FIGS 8-10 show an alternative embodiment in which the axis of rotation of the switching compartment is arranged at right angles to the battery compartment. In all important respects, this embodiment functions in the same manner as the previously described embodiment. Torches with right angle heads are adapted to be held in pockets or belts and thus a clip 32 may be provided, being attached to the torch by a number of possible methods, shown in Figure 10.
  • the torch has been described and illustrated as being essentially cylindrical. It may, of course, take other shapes and especially, the lamp 15 may be replaced by a strip light or fluorescent tube or even a chemical light source, in which case a rectangular or some other cross section may be appropriate.
  • the torch Since the switching compartment 2 and the battery compartment 1 are physically separated, the torch is safe and allows the option of changing batteries within a potentially explosive atmosphere if it should be required.
  • the switching compartment 2 cannot be opened except with a special tool which, of course, should be kept away from any potentially hazardous area. Simple rotation between two portions of the switching compartment enables the light to be switched on and off, and also enables a variation in the beam pattern of the light emitted.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
EP88302723A 1987-04-03 1988-03-28 Taschensicherheitsleuchte Withdrawn EP0285349A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8708000 1987-04-03
GB878708000A GB8708000D0 (en) 1987-04-03 1987-04-03 Safety torch

Publications (2)

Publication Number Publication Date
EP0285349A2 true EP0285349A2 (de) 1988-10-05
EP0285349A3 EP0285349A3 (de) 1989-09-06

Family

ID=10615182

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88302723A Withdrawn EP0285349A3 (de) 1987-04-03 1988-03-28 Taschensicherheitsleuchte

Country Status (2)

Country Link
EP (1) EP0285349A3 (de)
GB (1) GB8708000D0 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3834554A1 (de) * 1988-10-11 1990-04-12 Ruhrkohle Ag Notleuchte fuer grubenbetriebe
DE3940189A1 (de) * 1989-12-05 1991-06-06 Ceag Licht & Strom Handleuchte
EP0840058A1 (de) * 1996-11-05 1998-05-06 Zedel Tragbare elektrische Lampe mit einer rotierbaren Trommel
FR2755497A1 (fr) * 1996-11-05 1998-05-07 Zedel Lampe d'eclairage electrique portative a barillet rotatif
US6045236A (en) * 1996-08-09 2000-04-04 Black & Decker Inc. Twist on/off and adjustable focus flashlight
FR2927735A1 (fr) * 2008-02-14 2009-08-21 Raymond Bertois Appareil electrique a piles interchangeables, en particulier appareil de plongee sous-marine
US8272557B1 (en) 2011-11-11 2012-09-25 Lincoln Global, Inc. Shield for a cutting or welding torch
USD951505S1 (en) 2019-05-02 2022-05-10 Milwaukee Electric Tool Corporation Headlamp

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB187302A (en) * 1921-07-13 1922-10-13 James Scott Improvements in electric light fittings
US2935601A (en) * 1956-08-17 1960-05-03 Westinghouse Electric Corp Luminaire and mounting means therefor
DE2133708A1 (de) * 1971-07-07 1973-01-18 Gert Wagner Warnleuchte
US3794825A (en) * 1972-05-05 1974-02-26 C Krupansky Waterproof flashlight
US4142179A (en) * 1971-04-19 1979-02-27 Lowndes Roy B W Safety warning lamps for adverse or hazardous atmospheres
US4531178A (en) * 1981-08-14 1985-07-23 Uke Alan K Diver's flashlight
US4577263A (en) * 1984-09-06 1986-03-18 Anthony Maglica Miniature flashlight

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB187302A (en) * 1921-07-13 1922-10-13 James Scott Improvements in electric light fittings
US2935601A (en) * 1956-08-17 1960-05-03 Westinghouse Electric Corp Luminaire and mounting means therefor
US4142179A (en) * 1971-04-19 1979-02-27 Lowndes Roy B W Safety warning lamps for adverse or hazardous atmospheres
DE2133708A1 (de) * 1971-07-07 1973-01-18 Gert Wagner Warnleuchte
US3794825A (en) * 1972-05-05 1974-02-26 C Krupansky Waterproof flashlight
US4531178A (en) * 1981-08-14 1985-07-23 Uke Alan K Diver's flashlight
US4577263A (en) * 1984-09-06 1986-03-18 Anthony Maglica Miniature flashlight

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3834554A1 (de) * 1988-10-11 1990-04-12 Ruhrkohle Ag Notleuchte fuer grubenbetriebe
DE3940189A1 (de) * 1989-12-05 1991-06-06 Ceag Licht & Strom Handleuchte
EP0431462A2 (de) * 1989-12-05 1991-06-12 ABBPATENT GmbH Handleuchte
EP0431462A3 (en) * 1989-12-05 1992-03-04 Abb Ceag Licht- Und Stromversorgungstechnik Gmbh Portable lamp
US6045236A (en) * 1996-08-09 2000-04-04 Black & Decker Inc. Twist on/off and adjustable focus flashlight
EP0840058A1 (de) * 1996-11-05 1998-05-06 Zedel Tragbare elektrische Lampe mit einer rotierbaren Trommel
FR2755497A1 (fr) * 1996-11-05 1998-05-07 Zedel Lampe d'eclairage electrique portative a barillet rotatif
KR19980042018A (ko) * 1996-11-05 1998-08-17 뻬즐뽈 회전 실린더를 갖는 휴대용 회중전등
US6050699A (en) * 1996-11-05 2000-04-18 Zedel Portable electric torch with rotary cylinder
FR2927735A1 (fr) * 2008-02-14 2009-08-21 Raymond Bertois Appareil electrique a piles interchangeables, en particulier appareil de plongee sous-marine
US8272557B1 (en) 2011-11-11 2012-09-25 Lincoln Global, Inc. Shield for a cutting or welding torch
USD951505S1 (en) 2019-05-02 2022-05-10 Milwaukee Electric Tool Corporation Headlamp

Also Published As

Publication number Publication date
GB8708000D0 (en) 1987-05-07
EP0285349A3 (de) 1989-09-06

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