Cigarette gas lighter

Abstract: A heat collecting member is integrally formed with an upper projecting portion to be inserted in a through hole formed in a lower side portion of a nozzle member and a lower tubular member or a rod-shaped portion by using a metal. The tubular member or the rod-shaped portion is fitted on a wick member extending into a fuel tank for drawing up liquefied gas fuel, the heat of the liquefied gas fuel is directly conducted to the projecting portion through the tubular member or the rod-shaped portion to improve the thermal conductivity, so that the heat of vaporization is sufficiently supplied to the projecting portion, vaporization of the liquefied gas fuel at the lower side portion of the nozzle member and the projecting portion is promoted, and thus the lighting flare is stabilized.

Description: BACKGROUND OF THE INVENTION : I. Field of the Invention The present invention relates to a cigarette gas lighter in which a tank for storing liquefied gas fuel is constituted by a synthetic resin and, more particularly, to an improvement in arrangement of a burner member provided to the tank. II. Description of the Prior Art Conventionally, in a cigarette gas lighter, a tank for storing liquefied gas fuel is often constituted by a synthetic resin in order to reduce the weight or cost. Particularly, the tank of a disposable cigarette gas lighter is formed with a synthetic resin. A problem arises in such a cigarette gas lighter. That is, as described in Japanese Patent Publication No. 57-32304 and US-A-4,289,487, since even the part around the burner is made of a synthetic resin, the thermal conductivity of this portion is low compared to that of a metal burner. Then, the heat of vaporization required for vaporizing the liquefied gas fuel in the burner is not sufficiently supplied to the burner, vaporization is not sufficiently performed in the burner, and the liquefied gas fuel tends to be present in the burner. If the liquefied gas fuel is present in the burner, even when a predetermined amount of fuel is drawn up by the wick for drawing up the liquefied gas fuel, the vaporization amount is not stabilized, and thus gasified fuel injected from a gas jet nozzle constituting the burner is not stabilized, resulting in an unstable length of the flare of the lighter. The fuel can be sometimes injected from the nozzle in the form of a non-gasified liquid. Unstable flare length and external injection of the liquefied gas endanger the user if they occur during use of the cigarette gas lighter. According to the invention of the cigarette gas lighter described in the specification of the Japanese Patent Publication mentioned above, heat of the liquefied gas fuel used as the fuel is conducted to the pin disk of the burner to supply a sufficient amount of heat of vaporization to the passage of the liquefied gas fuel between the pin disk and the nozzle bottom to prevent the temperature therearound from rapidly falling. An upper end face of the heat collecting tube extending into the tank contacts the pin disk to conduct the heat of the liquefied gas to the pin disk through the heat collecting tube. However, in the cigarette gas lighter according to the invention described above, since the metal pin disk and the metal heat collecting tubes are separate members and the lower surface of the pin disk is brought into contact with the upper surface of the heat collecting tube, the distance between these upper and lower surfaces tends to be unstable depending on the degree of surface roughnesses of the lower and upper surfaces and the variation in size of various members provided to the burner. This unstable distance renders the heat conducting properties between the upper and lower surfaces unstable and thus adversely affects vaporization of the liquefied gas fuel more or less. DISCLOSURE OF THE INVENTION : It is a main object of the present invention to provide a cigarette gas lighter in which the vaporizing property of liquefied gas fuel in a burner is improved and the number of components is decreased. In order to achieve the above object, there is provided a cigarette gas lighter comprising the features according to claims 1 to 6. In the cigarette gas lighter having the above arrangement, since the heat of the liquefied gas fuel is directly, reliably, and stably conducted from the metal heat collecting member provided to the wick member and extending into the tank to the projection integrally formed with the heat collecting member at the lower portion of the nozzle member, heat is sufficiently supplied, and vaporization of the liquefied gas fuel at this portion is sufficiently performed. Since the heat collecting member and the projection of the lower portion of the nozzle member are integrally formed, the number of components is decreased compared to a conventional cigarette gas lighter, and assembly and parts management can be facilitated. Since the fuel through hole is formed in the tubular portion of the heat collecting member in a direction perpendicular to the axis of the nozzle member, the liquefied gas fuel is not directly supplied to the lower portion of the nozzle member, but reaches the lower portion of the nozzle member through the gap between the side portion of the tubular portion and the porous member, and hence the length of the passage of the liquefied gas fuel is increased to sufficiently perform vaporization. Since the wick member is inserted in and formed by the tubular member, part of the wick member is also present in the fuel through hole communicating with the interior of the tubular member, and thus the wick member is firmly fixed on the tubular member without being removed from the tubular portion. The above and other objects, arrangements, and features of the present invention will become apparent from the detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS : Fig. 1 is a front sectional view of a cigarette gas lighter according to the first embodiment of the present invention; Fig. 2 is a sectional view of a heat collecting member of the cigarette gas lighter shown in Fig. 1; and Fig. 3 is a sectional view showing a main part of a cigarette gas lighter according to the second embodiment of the present invention. BEST MODE OF CARRYING OUT OF THE INVENTION : Fig. 1 is a front sectional view of an upper portion of a cigarette gas lighter according to the first embodiment of the present invention. Referring to Fig. 1, a fuel tank 1 is constituted by a container portion 1a made of a synthetic resin for storing known liquefied gas fuel and a lid 1b for sealing the upper opening of the container portion 1a. A first receiving recess 2 for storing a burner member (to be described later) and a second receiving recess 3 for storing a lighting means are formed in the lid 1b. A nozzle member 11 having inner and outer tubes 4 and 5, a gas jet nozzle 6, a valve packing 7, a valve seat 9, and a spring 10 is screwed in the upper portion of the first receiving recess 2 to be vertically movable while its side portion is sealed by an annular packing 12. The inner tube 5 is fitted in the lower portion of the outer tube 4. The gas jet nozzle 6 is housed in a tubular member consisting of the outer and inner tubes 4 and 5 to be vertically movable, and a side hole 6b for causing the interior of the tubular member to communicate with a central hole 6a is formed in the gas jet nozzle 6. The valve packing 7 is fixed to the lower end of the nozzle 6. The valve seat 9 is provided at the bottom portion of the inner tube 5, and a through hole 8 which is closed and opened by the valve packing 7 is formed in the valve seat 9. The spring 10 biases the nozzle 6 in a direction to close the through hole 8 with the valve packing 7. In the lower portion of the first receiving recess 2, an annular porous member 13 is disposed on the bottom surface of the valve seat 9 of the inner tube 5, and a metal tubular heat collecting member 18 is disposed. A projection 14 is formed at the upper end portion of the heat collecting member 18, fuel through holes 16 are formed in an upper large-diameter portion 15 of the heat collecting member 18 in a direction perpendicular to the axis of the nozzle 11, and a tubular portion 17 is formed at the lower portion of the heat collecting member 18, as shown in the sectional view of Fig. 2. The upper portion of the projection 14 enters the through hole 8 in the valve seat 9 through a hole 13a of the annular porous member 13 to clamp the annular porous member 13 with the upper large-diameter portion 15 and the outer bottom surface of the inner tube 5. The end portion of a wick member 19 suspending into the fuel tank 1 for drawing up the liquefied gas fuel is fixed to the tubular portion 17 of the tubular heat collecting member 18. A member having a shaft-like shape may be inserted and fitted as the wick member 19 in the tubular portion 17 after the respective portions of the tubular heat collecting member 18 are formed as shown in Fig. 2. Alternatively, a wick-forming mold (not shown) may be arranged in the tubular portion 17 and a known wick material may be inserted in the tubular portion 17 to form the wick member 19 by insertion formation. If the insertion formation is adopted, the wick member 19 extends from the interior of the tubular portion 17 to the fuel through holes 16, and the wick member 19 is reliably held by the tubular portion 17, thus preventing the wick member 19 from being removed. As described above, a burner member 20 constituted by the nozzle member 11, the porous member 13, the tubular heat collecting member 18, and the wick member 19 is mounted in the first receiving recess 2. A ring 21 having an operating projection 21a formed thereon is fitted on the outer tube 4 of the nozzle member 11. When the operating projection 21a is pivoted, the nozzle member 11 is vertically moved to adjust the fuel flow through the porous member 13. The distal end portion of the operating projection 21a projects from a windshield member 22 covering the distal end portion of the nozzle member 11 so that it can be externally operated. A striker wheel 25 is rotatably supported in the second receiving recess 3, and a flint unit 28 having a flint 27 urged by a flint spring 26 and serving as a lighting means is fixed to the striker wheel 25. An operating member 30, having one end 30a engaged with a small-diameter portion of the nozzle 6 of the nozzle member 11 and the other end forming a gas lever 30b, is rotatably supported on the flint unit 28 through a support shaft 30c at its central portion. In the cigarette gas lighter described above, when the striker wheel 25 is rotated, a spark is generated by friction between the striker wheel 25 and the flint 27 and scattered around the nozzle 6 portion. At this time, when the gas lever 30b of the operating member 30 is depressed, the operating member 30 is pivoted about the support shaft 30c to lift the nozzle 6 by its one end 30a. When the nozzle 6 is moved upward against the biasing force of the spring 10, the through hole 8 which has been closed by the valve packing 7 is opened to set a valve-open state. In the valve-open state, the liquefied gas fuel drawn up by the wick member 19 enters the first receiving recess 2 through the fuel through holes 16 of the tubular heat collecting member 18 and reaches the through hole 8 between the projection 14 of the tubular heat collecting member 18 and the valve seat 9 through the porous member 13. The liquefied gas fuel is gasified in the through hole 8. The gasified fuel enters the nozzle member 11 and is injected to the outside from the central hole 6a through the side hole 6b of the nozzle 6 and is lighted upon reception of the heat of the spark. The liquefied gas fuel is not supplied to the valve seat 9 of the nozzle member 11 directly. Rather, it flows to a side portion of the tubular heat collecting member 18 from the pair of fuel through holes 16 and passes through the gap between the first receiving recess 2 and the upper large-diameter portion 15 and the porous member 13 to reach the valve seat 9. Since the passage of the liquefied gas fuel is long, the maximum vaporization range is increased by the increase in passage, thus performing stable and sufficient vaporization. When the gas lever 30b of the operating member 30 is released, the nozzle 6 is moved downward as it is biased by the spring 10 to close the through hole 8 by the valve packing 7, thus stopping supply of the liquefied gas fuel and extinguishing fire. Upon vaporization of the liquefied gas fuel described above, since the constituent members of the burner member 20 around the vaporizing unit are deprived of the heat of vaporization, the temperature of the valve seat 9 of the nozzle member 11 and that of the projection 14 of the tubular heat collecting member 18 are particularly decreased. However, since external heat reaches the valve seat 9 and the heat of the liquefied gas fuel directly reaches the projection 14 from the wick member 19 and the tubular portion 17, the heat of vaporization is sufficiently supplied to these portions, and the liquefied gas fuel is sufficiently gasified. Hence, the amount of gasified fuel injected from the nozzle 9 is stabilized, thereby stabilizing the height of the flare. In this embodiment, since the mass of the upper large-diameter portion 15 of the tubular heat collecting member 18 including the projection 14 is large and the upper large-diameter portion 15 and the projection 14 are integrally formed without a gap, the thermal efficiency is improved. Fig. 3 is a sectional view showing a main part of a cigarette gas lighter according to the second embodiment of the present invention. In the second embodiment, a heat collecting member 35 has a shape different from that of its corresponding tubular heat collecting member 18 provided in the first receiving recess 2 of the fuel tank 1 of the first embodiment. In place of the tubular portion 17 of the tubular heat collecting member 18 of the first embodiment, a solid rod 37 integrally formed with a large-diameter portion 36 suspends from the large-diameter portion 36 to simplify the arrangement. The solid rod 37 is inserted and fixed in a wick member 38 for drawing up the liquefied gas fuel. A projection 14 is formed on the upper portion of the large-diameter portion 36 in the same manner as in the tubular heat collecting member 18 to partly extend into a through hole 8 of a valve seat 9 through a porous member 13. In the embodiments described above, a flint type lighting means has been described. However, the lighting means is not limited to the arrangement shown in the drawings, and an electrical lighting means which generates a spark by utilizing a piezoelectric element or a cell and performs lighting can be used. As has been described above, according to the present invention, the heat of the liquefied gas fuel can be directly supplied to the projection of the heat collecting member at the lower portion of the nozzle member, the heat of vaporization required for vaporization of the liquefied gas fuel at this portion is sufficiently supplied, and vaporization of the liquefied gas fuel is stably and reliably performed. As a result, the amount of gasified fuel injected from the nozzle member is stabilized, and thus the height of flare is stabilized. Since the projection is integrally formed with the heat collecting member, the number of components can be decreased, thus facilitating assembly and parts management.

Claims: A cigarette gas lighter comprising a tank (1) made of a synthetic resin for storing liquefied gas fuel, a burner member (20), having a gas injecting nozzle member (11) and a wick member (19, 38) suspending into said tank (1) for absorbing the liquefied gas fuel, and fixed in a receiving recess (2) formed in said tank (1), lighting means (25, 27, 28) for lighting gasified fuel injected from said nozzle member, a lower portion of a metal heat collecting member (18, 35) extending into said tank (1) outside or inside said wick member (19, 38), and a through hole (8) formed in a lower side portion of said nozzle member (11) through a porous member (13) disposed in a lower portion of said nozzle member (11), characterized in that said lower portion of said metal heat collecting member (18, 35) is integrally formed with a projection (14) at an upper end portion (15) thereof, and in that said projection (14) is inserted in said through hole (8) through said nozzle member (11). A lighter according to claim 1, wherein an outer side of said wick member (19) is held by a tubular member (17) formed at a lower portion of said heat collecting member (18). A lighter according to claim 2, wherein a fuel through hole (16) for causing an interior and an outside of said tubular portion (17) to communicate with each other in a direction perpendicular to an axis of said nozzle member (11) is formed in a side portion of said tubular portion (17) in a receiving recess formed in said tank (1). A lighter according to any one of claims 2 and 3, wherein a wick material is filled up to said tubular portion (17) to form said wick member (19) by said tubular portion (17) in accordance with insertion formation. A lighter according to any one of claims 2 and 3, wherein said wick member (19) which is performed is fitted in said tubular portion (17). A lighter according to claim 1, wherein a preformed rod member (37) is inserted and fixed in said wick member (38) at a lower portion of said heat collecting member (35).

Inventors: KHEMARANGSAN DECHA, KHEMARANGSAN, DECHA
Applicants: THAI MERRY CO LTD, THAI MERRY CO., LTD.
Application year: 1992
Main classification: F23Q2
IPC codes: F23Q2