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GB2338290A - Cylindrical torch with variable focusing capability - Google Patents

Cylindrical torch with variable focusing capability Download PDF

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Publication number
GB2338290A
GB2338290A GB9812493A GB9812493A GB2338290A GB 2338290 A GB2338290 A GB 2338290A GB 9812493 A GB9812493 A GB 9812493A GB 9812493 A GB9812493 A GB 9812493A GB 2338290 A GB2338290 A GB 2338290A
Authority
GB
United Kingdom
Prior art keywords
torch
barrel
lamp
spring
flange
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Withdrawn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
GB9812493A
Other versions
GB9812493D0 (en
Inventor
Shoei-Shuh Shiau
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.)
SHIAO WEN CHIN
Original Assignee
SHIAO WEN CHIN
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 SHIAO WEN CHIN filed Critical SHIAO WEN CHIN
Priority to GB9812493A priority Critical patent/GB2338290A/en
Publication of GB9812493D0 publication Critical patent/GB9812493D0/en
Publication of GB2338290A publication Critical patent/GB2338290A/en
Withdrawn legal-status Critical Current

Links

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
    • 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
    • F21V23/0421—Arrangement of electric circuit elements in or on lighting devices the elements being switches specially adapted to be used with portable lighting devices the switch being part of, or disposed on the tail cap portion thereof
    • 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
    • F21L4/08—Electric lighting devices with self-contained electric batteries or cells characterised by means for in situ recharging of the batteries or cells
    • F21L4/085—Pocket lamps
    • 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
    • F21V14/04—Controlling the distribution of the light emitted by adjustment of elements by movement of reflectors
    • F21V14/045—Controlling the distribution of the light emitted by adjustment of elements by movement of reflectors in portable lighting devices

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Abstract

A torch includes a conductive torch barrel (20) for receiving a rechargeable cell unit therein, a head lamp assembly (40) on one end of the barrel (20), and a switch assembly (50) on the other end of the barrel (20). The head lamp assembly (40) includes a tubular sleeve (41) coupled to the barrel (20), and a lamp base (42) disposed inside the sleeve (41) and having a conductive spring (426) mounted thereon for contacting electrically a first battery terminal of the cell unit. The lamp base (42) is adapted for mounting a lamp (425) thereon such that the first lamp terminal is connected electrically to the barrel (20) and the second lamp terminal is connected electrically to the conductive spring (426). A head cap (43) is coupled threadedly with the sleeve (41), and a reflector (423) is disposed inside the head cap (43). A positioning spring (422) extends into the sleeve (41) and abuts against the lamp base (42) and the reflector (423) to bias the reflector (423) against the head cap (43). The switch assembly (50) is operable so as to make or break electrical connection between the barrel (20) and a second battery terminal of the cell unit.

Description

c 1 is 2338290 CHARGING-TYPE TORCH WITH VARIABLE FOCUSING CAPABILITY The
invention relates to a handheld torch, more particularly to a charging-type torch with a variable focusing capability.
Referring to Figure 1, a conventional charging-type torch is shown to comprise a conductive torch barrel 10, a head lamp assembly 11 mounted on a front end portion 100 of the torch barrel 10, and a switch assembly 17 mounted on a rear end portion 101 of the torch barrel 10. The head lamp assembly 11 includes a lamp base 14 received in the f ront end portion 100 of the torch barrel 10. A conductive spring 13 is mounted on the rear portion of the lamp base 14, while a lamp 15 is mounted on the front portion of the lamp base 14. A tubular head cap 16 engages an external screw thread 12 formed on the f ront end portion 100 of the torch barrel 10 and retains the lamp base 14 in the torch barrel 10. One terminal of the lamp 15 is connected electrically to the torch barrel 10 via electrical contact between the lamp base 14 and the torch barrel 10. The other terminal of the lamp 15 is connected electrically to the conductive spring 13. The switch assembly 17 includes a tubular tail cap 18 mounted on the rear end portion 101 of the torch barrel 10, a conductive switch body 170 disposed in the tail cap 18, and a conductive tail spring 19 mounted on a front end 172 of the switch body 170. The switch body 170 has an intermediate portion formed with 2 1 1 i a radial contact flange 171. The tail cap 18 is formed with an inward limit flange 180 that abuts against a rear side of the contact flange 171. A clearance 173 is formed between the inner wall surface of the tail cap 18 and the front portion 172 of the switch body 170.
When the tail cap 18 is mounted threadedly on the rear end portion 101 of the torch barrel 10, the rear end portion 101 extends into the clearance 173 without contacting the front portion 172 of the switch body 170.
It should be noted that, except for the electrical contact part between the lamp base 14 and the torch barrel 10, an end face 102 of the rear end portion 101 of the torch barrel 10, and an annular charger contact 104 on the torch barrel 10, the torch barrel 10 and the is tail cap 18 are both coated with an insulator film, thereby preventing electrical connection between the torch barrel 10 and the switch body 170 via the tail cap 18. The insulator film is indicated in Figures 1 and 3 as thicker lines on major surfaces of the torch barrel 10 and the tail cap 18.
In use, a rechargeable battery cell (B) is received in the torch barrel 10 and is held between the conductive spring 13 and the tail spring 19. When the tail cap 18 is rotated to result in rearward translation of the same relative to the torch barrel 10, the tail spring 19 expands and pushes the switch body 170 so that the contact flange 171 is not in contact with the end face 3 102 of the rear end portion 101 of the torch barrel 10.
Connection between one terminal of the battery cell (B) and the torch barrel 10 is thus broken by the switch assembly 17 to interrupt current flow to the lamp 15, thereby deactivating the torch.
Figure 2 illustrates a charging device for recharging the torch of Figure 1. The charging device includes a seat 190 for holding the torch thereon, a first charging contact 191 on the seat 190 for establishing electrical connection with the switch body 170, and a second charging contact 192 on the seat for establishing electrical connection with the charger contact 104 on the torch barrel 10. Thus, current can flow from the first charging contact 191, is the switch body 170, the tail spring 19, the battery cell (B), the conductive spring 13, the lamp 15, the torch barrel 10 and to the second charging contact 192 for recharging the battery cell (B).
Referring to Figure 3, when it is desired to activate the torch, the tail cap 18 is rotated to result in forward translation of the same relative to the torch barrel 10. The switch body 170 is pushed by the limit flange 180 on the tail cap 18 against the action of the tail spring 19 so that the contact flange 171 contacts the end face 102 of the rear end portion 10 1 of the torch barrel 10. Electrical connection between the battery cell (B) and the torch barrel 10 via the switch assembly 4 is 17 is thus established to activate the lamp 15.
It is noted that the conventional torch does not incorporate a variable focusing capability. In addition, because the switch assembly 17 is designed to permit intermittent operation of the switch body 170 so as to result in intermittent actuation of the lamp 15 for signaling purposes, the axis of the switch body 170 in the tail cap 18 will eventually deviate after a period of use, thereby resulting in the possibility of untimely contact between the front portion 172 of the switch body 170 and the inner wall surface 103 of the rear end portion 101 of the torch barrel 10. Improper operation of the switch assembly 17 can thus result after the conventional torch has been in use for a period of time.
Therefore, the main object of the present invention is to provide a charging-type torch with a variable focusing capability.
Another object of the present invention is to provide a charging-type torch with a durable switch construction.
Accordingly, the charging-type torch with a variable focusing capability of this invention comprises:
a conductive torch barrel having front and rear end portions and adapted for receiving a rechargeable cell unit therein; a head lamp assembly including a tubular sleeve having a front end portion and a rear end portion coupled to the front end portion of the torch barrel, a lamp base disposed inside the tubular sleeve and having a rear portion with a conductive spring mounted thereon, the conductive spring being adapted to contact electrically a f irst battery terminal of the rechargeable cell unit, the lamp base further having a front portion adapted for mounting a lamp with first and second lamp terminals thereon such that the first lamp terminal is connected electrically to the torch barrel and the second lamp terminal is connected electrically to the conductive spring, a tubular head cap coupled threadedly with the front end portion of the tubular sleeve and formed with an inward stop flange, a reflector disposed inside the head cap and formed with a radial abutment flange, the reflector being adapted to permit extension of the lamp therein, and a positioning spring having a rear portion that extends into the front end portion of the tubular sleeve and that abuts against the lamp base, and a front portion that abuts against the reflector to bias the abutment flange to engage the stop flange; and 6 a switch assembly mounted on the rear end portion of the torch barrel and operable so as to make or break electrical connection between the torch barrel and a second battery terminal of the rechargeable cell unit.
When the head cap is rotated relative to the tubular sleeve, axial translation of the reflector relative to the tubular sleeve occurs against action of the positioning spring to vary degree of extension of the lamp into the reflector and result in a variable focusing effect.
Preferably, the switch assembly comprises:
a tubular tail cap coupled threadedly with the rear end portion of the torch barrel and formed with an inward limit flange; is a conductive switch body disposed in the tail cap such that the switch body is electrically insulated from the tail cap, the switch body having a surrounding wall surface provided with an insulator layer, an intermediate portion formed with a radial contact flange that extends through the insulator layer, and a front portion that extends into the torch barrel such that the insulator layer is in sliding contact with an inner wall surface of the torch barrel; and a conductive tail spring mounted on a front end of the switch body and adapted to contact electrically a second battery terminal of the rechargeable cell unit, the tail spring biasing the contact flange to abut 7 against the limit flange and to move away from an end face of the torch barrel so as to break electrical connection between the torch barrel and the second battery terminal of the rechargeable cell unit.
when the tail cap is rotated for forward translation relative to the torch barrel, the limit flange pushes the contact flange against action of the tail spring so that the contact flange contacts the end face of the torch barrel in order to establish electrical connection between the torch barrel and the second battery terminal of the rechargeable cell unit.
other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiment with reference to the accompanying drawings, of which:
Figure 1 is a sectional view of a conventional charging-type torch; Figure 2 is a perspective view of a charging device for the torch of Figure 1; Figure 3 is a sectional view illustrating the operation of a switch assembly of the torch of Figure 1; Figure 4 is a sectional view of the preferred embodiment of a charging- type torch according to the present invention; Figure 5 is an exploded view of the preferred embodiment; 8 Figure 6 is a fragmentary sectional view illustrating the operation of a head lamp assembly of the preferred embodiment; and Figure 7 is a fragmentary sectional view illustrating the operation of a switch assembly of the preferred embodiment.
Referring to Figures 4 and 5, the preferred embodiment of a charging-type torch according to the present invention is shown to comprise a conductive torch barrel 20, a head lamp assembly 40, and a switch assembly 50.
In this embodiment, the conductive torch barrel 20 includes f irst and second barrel sect ions 2 0 0, 3 0 0 that are coupled removably to each other to permit lengthening of the torch barrel 20. The first barrel sect ion 2 0 0 has f ront and rear end port ions f ormed with external screw threads 22, 23, and an intermediate portion 21 with an outer wall surface that is coated with an insulator film. The front end portion of the first barrel section 200 is further formed with an annular charger contact 24 proximate to the intermediate portion 21. The annular charger contact 24 is adapted for establishing electrical connection between the torch barrel 20 and the second charging contact 192 of the conventional charging device 190 shown in Figure 2. The second barrel section 300 has a f ront end portion formed with an internal screw thread 9 32 for coupling threadedly with the external screw thread 23 on the rear end portion of the first barrel section 200, a rear end portion formed with an external screw thread 33, and an intermediate portion 31 between the front and rear end portions. The front end portion and the intermediate portion 31 of the second barrel section 30 have outer wall surfaces that are coated with an insulator film. The torch barrel 20 is adapted to receive a rechargeable cell unit therein. The rechargeable cell unit includes rechargeable battery cells 55, the number of which depends on the number of barrel sections 200, 300 that are in use.
The head lamp assembly 40 includes a tubular sleeve 41, a lamp base 42, a tubular head cap 43, a reflector 423, and a positioning spring 422. The tubular sleeve 41 has a front end portion formed with an external screw thread 410, and a rear end portion formed with an internal screw thread 411 for coupling threadedly with the external screw thread 22 on the front end portion of the first barrel section 200. The lamp base 42 is disposed inside the tubular sleeve 41, and has a rear portion 420 with a conductive spring 426 mounted thereon. The conductive spring 426 is adapted to contact electrically a first battery terminal of the rechargeable cell unit. The lamp base 42 further has a front portion 421 adapted for mounting a lamp 425 thereon. The lamp 425 has a first lamp terminal connected electrically to the torch barrel 20, such as via electrical contact between the lamp base 42 and the torch barrel 20, and a second lamp terminal connected electrically to the conductive spring 426. The head cap 43 is formed with an internal screw thread 430 for coupling threadedly with the external screw thread 410 on the front end portion of the tubular sleeve 41. The head cap 43 is further formed with an annular inward stop flange 431. The reflector 423 is disposed inside the head cap 43 and is formed with an annular abutment flange 424. The reflector 423 permits extension of the lamp 425 therein. The positioning spring 422 is formed as a coil spring and has a rear portion that extends into the front end portion of the tubular sleeve 41, that is disposed around the front portion 421 of the lamp base 42, and that abuts against the lamp base 42. The positioning spring 422 further has a front portion that extends out of the tubular sleeve 41 and into the head cap 43 such that the reflector 423 extends into the front portion of the positioning spring 422 and abuts against the same. When the head cap 43 is coupled to the tubular sleeve 41, the positioning spring 422 biases the abutment flange 424 on the reflector 423 to engage the stop flange 43 1, and further biases the lamp base 42 to abut against an end face 220 on the front end portion of the f irst barrel section 200. By rotating the head cap 43, axial translation of the reflector 423 1 1 is relative to the tubular sleeve 41 occurs against action of the positioning spring 422 and is limited by the engagement of the abutment flange 424 with the end face 412 on the front end portion of the tubular sleeve 41 to vary the degree of extension of the lamp 425 into the reflector 423, thereby resulting in a variable focusing effect, as shown in Figure 6.
The switch assembly 50 is operable so as to make or break electrical connection between the torch barrel 20 and a second battery terminal of the rechargeable cell unit, and includes a tubular tail cap 51, a conductive switch body 52 disposed in the tail cap 51, and a conductive tail spring 522 mounted on a front end of the switch body 52. The tail cap 51 is formed with an internal screw thread 53 for coupling threadedly and selectively with the external screw thread 33 on the rear end portion of the second barrel section 300, or with the external screw thread 23 on the rear end portion of the first barrel section 200. The tail cap 51 further has a rear end formed with an inward limit flange 54, and is coated with an insulator film for electrical insulation with the switch body 52. The switch body 52 has a surrounding wall surface provided with an insulator layer 521, and an intermediate portion formed with a radial contact flange 520 that extends through the insulator layer 521. Preferably, the rear portion 523 of the switch body 52 extends out of the tail cap 12 is 51 and is adapted for establishing electrical connection with the first charging contact 191 of the conventional charging device 190 shown in Figure 2. When the tail cap 51 is mounted threadedly on the torch barrel 20, the front portion of the switch body 52 extends into the torch barrel 2 0 such that the insulator layer 521 is in sliding contact with an inner wall surface 26, 35 of the first or second barrel section 200, 300. The tail spring 522 is adapted to contact electrically the second battery terminal of the rechargeable cell unit. When the tail cap 51 is rotated to result in rearward translation of the same relative to the torch barrel 20, the tail spring 522 expands and pushes the switch body 52 so that the contact flange 520 abuts against the limit flange 54 on the tail cap 51 and moves away from the end face 25, 34 of the rear end portion of the first or second barrel section 200, 300. Electrical connection between the second battery terminal of the rechargeable cell unit and the torch barrel 20 is thus broken by the switch assembly 50 to interrupt current flow to the lamp 425, thereby deactivating the torch.
Referring to Figure 7, when it is desired to activate the torch, the tail cap 51 is rotated to result in forward translation of the same relative to the torch barrel 20. The switch body 52 is pushed by the limit flange 54 on the tail cap 51 against the action of the 13 tail spring 522 so that the contact flange 520 contacts the end face 25, 34 of the rear end portion of the first or second barrel section 200, 300. Electrical connection between the rechargeable cell unit and the torch barrel 20 via the switch assembly 50 is thus established to activate the lamp 425. Due to the presence of the insulator layer 521, undesired electrical contact between the switch body 52 and the torch barrel 20 can be effectively prevented even after the torch of this invention has been in use for a period of time, thereby resulting in a durable switch construction.
14

Claims (7)

CLAIMS:
1. A charging-type torch with a variable focusing capability, comprising: a conductive torch barrel having front and rear end portions and adapted for receiving a rechargeable cell unit therein; a head lamp assembly including a tubular sleeve having a front end portion and a rear end portion coupled to the front end portion of the torch barrel, a lamp base disposed inside the tubular sleeve and having a rear portion with a conductive spring mounted thereon, the conductive spring being adapted to contact electrically a f irst battery terminal of the rechargeable cell unit, the lamp base further having a front portion adapted for mounting a lamp with first and second lamp terminals thereon such that the f irst lamp terminal is connected electrically to the torch barrel and the second lamp terminal is connected electrically to the conductive spring, a tubular head cap coupled threadedly with the f ront end portion of the tubular sleeve and formed with an inward stop flange, a reflector disposed inside the head cap and formed with a radial abutment flange, the reflector being adapted to permit extension of the lamp therein, and 1 5 is a positioning spring having a rear portion that extends into the f ront end portion of the tubular sleeve and that abuts against the lamp base, and a f ront portion that abuts against the reflector to bias the abutment flange to engage the stop flange; and a switch assembly mounted on the rear end portion of the torch barrel and operable so as to make or break electrical connection between the torch barrel and a second battery terminal of the rechargeable cell unit; whereby, when the head cap is rotated relative to the tubular sleeve, axial translation of the reflector relative to the tubular sleeve occurs against action of the positioning spring to vary degree of extension of the lamp into the reflector and result in a variable focusing effect.
2. The charging-type torch with a variable focusing capability according to claim 1, wherein the switch assembly comprises: a tubular tail cap coupled threadedly with the rear end portion of the torch barrel and f ormed with an inward limit flange; a conductive switch body disposed in the tail cap such that the switch body is electrically insulated f rom the tail cap, the switch body having a surrounding wall surface provided with an insulator layer, an intermediate portion formed with a radial contact flange that extends through the insulator layer, and 16 a front portion that extends into the torch barrel such that the insulator layer is in sliding contact with an inner wall surface of the torch barrel; and a conductive tail spring mounted on a 'front end of the switch body and adapted to contact electrically a second battery terminal of the rechargeable cell unit, the tail spring biasing the contact flange to abut against the limit flange and to move away from an end face of the torch barrel so as to break electrical connection between the torch barrel and the second battery terminal of the rechargeable cell unit; whereby, when the tail cap is rotated for forward translation relative to the torch barrel, the limit flange pushes the contact flange against action of the tail spring so that the contact flange contacts the end face of the torch barrel in order to establish electrical connection between the torch barrel and the second battery terminal of the rechargeable cell unit.
3. The charging-type torch with a variable focusing capability according to claim 1, wherein the torch barrel includes f irst and second barrel sections that are coupled removably to each other and that can be coupled selectively to the switch assembly to permit lengthening of the torch barrel.
4. The charging-type torch with a variable focusing capability according to claim 1, wherein the front portion of the positioning spring extends out of the 1 17 1 tubular sleeve and into the head cap.
5. The charging-type torch with a variable focusing capability according to claim 4, wherein the positioning spring is a coiled spring having the rear portion thereof disposed around the front portion of the lamp base, the front portion of the positioning spring having the reflector extending therein.
6. The charging-type torch with a variable focusing capability according to claim 2, wherein the switch body further has a rear portion that extends out of the tail cap.
7. The charging-type torch with a variable focusing capability substantially as hereinbefore described with reference to and as illustrated in Figures 4 to is 7 of the accompanying drawings.
GB9812493A 1998-06-11 1998-06-11 Cylindrical torch with variable focusing capability Withdrawn GB2338290A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9812493A GB2338290A (en) 1998-06-11 1998-06-11 Cylindrical torch with variable focusing capability

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9812493A GB2338290A (en) 1998-06-11 1998-06-11 Cylindrical torch with variable focusing capability

Publications (2)

Publication Number Publication Date
GB9812493D0 GB9812493D0 (en) 1998-08-05
GB2338290A true GB2338290A (en) 1999-12-15

Family

ID=10833516

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9812493A Withdrawn GB2338290A (en) 1998-06-11 1998-06-11 Cylindrical torch with variable focusing capability

Country Status (1)

Country Link
GB (1) GB2338290A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB327031A (en) * 1929-04-18 1930-03-27 Schmidt & Co Gmbh Improvements in electric hand and pocket lamps
GB559334A (en) * 1942-07-10 1944-02-15 Katzinger Edward Co Improvements in or relating to electric flashlights and focussing lamp assemblies therefor
US4577263A (en) * 1984-09-06 1986-03-18 Anthony Maglica Miniature flashlight
US4821156A (en) * 1988-04-14 1989-04-11 Tekna Flashlight with focusing beam assembly
GB2265450A (en) * 1991-11-22 1993-09-29 Shiau Shoei Shuh A variable focusing flashlight

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB327031A (en) * 1929-04-18 1930-03-27 Schmidt & Co Gmbh Improvements in electric hand and pocket lamps
GB559334A (en) * 1942-07-10 1944-02-15 Katzinger Edward Co Improvements in or relating to electric flashlights and focussing lamp assemblies therefor
US4577263A (en) * 1984-09-06 1986-03-18 Anthony Maglica Miniature flashlight
US4821156A (en) * 1988-04-14 1989-04-11 Tekna Flashlight with focusing beam assembly
GB2265450A (en) * 1991-11-22 1993-09-29 Shiau Shoei Shuh A variable focusing flashlight

Also Published As

Publication number Publication date
GB9812493D0 (en) 1998-08-05

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