Metallic Wick Assembly

Abstract

A metallic wick assembly includes at least one mesh member and a sleeve member. The at least one mesh member includes a first length defined between first and second ends thereof. The sleeve member is mounted around the mesh member and includes a second length defined between two longitudinal opposite ends thereof. The second length is less than the first length. A third length is defined between a distal end of the sleeve member and the first end of the mesh member. The sleeve member is slidable with respect to the mesh member to adjust the third length for controlling the flame scale.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a wick assembly and, more particularly, to a wick assembly made of metal and provided for being mounted to a lamp device for precisely control the flame combustion scale.

2. Description of the Related Art

A conventional lamp device includes a fuel cup storing fuel, and a wick connecting into fuel stored in the fuel cup. Moreover, the wick is normally made out of braided cotton and works by capillary action. Fuel is drawn up through the wick to reach the flame produced on the disk. The above lamp device is actively used for various purposes, such as lighting, decorating, or increasing atmosphere. For example, an oil lamp is used in religion, or an alcohol lamp is used in medical or chemical laboratories.

The conventional cotton wick must be cut to a predetermined length adapted for being mounted to the lamp device. However, after trimming, the cotton wick is easily loosened at its terminal end. After ignition, fuel vaporizes and combusts on the wick, the tip of the cotton wick will be carbonized and burnt out gradually on the tip due to higher temperature on the top of flame. Thus, the cotton wick must be pulled out and trimmed to a certain length every once in a while to maintain combustion scale. Trimming the cotton wick results in the wick eventually unconnected with fuel, so that users can only replenish fuel or replace a new wick. It is inconvenient and wasteful.

The wick length, diameter, stiffness and fire-resistance are the major factors used to adjust fuel wicking and flame scale for the lamp device. However, cotton wicks with low stiffness and low fire-resistance cannot be adjusted easily to maintain proper fuel wicking and flame scale, especially for high viscosity or high flash point fuels results in producing carbon deposits and difficult to ignite. If the fuel drawn is slower than it burns, wick will be carbonized and burnt out. If the fuel drawn is more than it burns, usually occurring on burning high flash point fuel, will cause slow evaporation of the fuel and produce soot due to incomplete combustion. Incomplete combustion not only produces soot but also toxic fumes.

Taiwan Patent No. 493,722 discloses a wick includes a plurality of fiberglass filaments disposed and assembled at a center thereof to form a fiberglass layer, and a plurality of fiberglass yarns and melted silks arranged around the fiberglass layer. The fiberglass layer is able to draw fuel by capillary action, hard to burn down, and not easily being loosened at its terminal end. However, the fiberglass layer does not draw fuel effectively to cause the flame extinguished easily and the flame scale difficult to be controlled. Moreover, Taiwan Patent No. 580,106 discloses a wick includes a cotton thread enabling to draw fuel and a plurality of fiberglass filaments covering around the cotton thread to avoid the cotton thread diverged to provide a compound wick.

Therefore, the wick disclosed by said patents both include fiberglass filaments, but the fiberglass is expansive, difficult processing. Momentously, the wick is a large quantity of consumable items, but the fiberglass wick is expensive, and not environment-friendly. Additionally, when the fiberglass wick is processed, inhaling the fiberglass can cause damage to human lungs and be harmful to manufacturing personnel. Inhaling of fiberglass will jeopardize the health of workers during fiberglass-reinforced plastic processing. The fiberglass fiber can also cause skin, eye and throat irritation to users. At higher exposure levels, the fiberglass also has been associated with skin rashes and difficulty in breathing.

Likewise, fiberglass wick will be carbonized and burned out during combustion, but only slower than cotton wick, so that the fiberglass wick needs be trimmed also. Furthermore, the fiberglass wick and the cotton wick are easy to sag due to gravity when they are saturated with fuel. Thus, the user cannot adjust the flame height or scale easily. If a user wants to adjust the flame height or scale, the user has to pull the wick out from the lamp device constantly. At the same time, the user may also contact fuel in the wick and cause inconvenience or even danger.

The present invention is, therefore, intended to obviate or at least alleviate the problems encountered in the prior art.

SUMMARY OF THE INVENTION

The present invention revolves these requirements and other problems in the field of a metallic wick assembly including at least one mesh member and a sleeve member mounted around the mesh member. The mesh member first and second ends disposed opposite to each other, first and second surfaces respectively extended from the first end to the second end thereof and arranged opposite to each other, a plurality of meshes penetrating the first and second surfaces between the first and second ends thereof, and a transport channel extending from the first end to the second end thereof drawing fuel by capillary action. The mesh member includes a first length defined between the first and second ends thereof. The sleeve member includes a second length defined between two longitudinal opposite ends thereof. The second length of the sleeve member is less than the first length. A third length is defined between a distal end of the sleeve member and the first end of the mesh member. The sleeve member is slidable with respect to the mesh member to adjust the third length for controlling the flame scale.

In an example, the metallic wick assembly generally includes a mesh member rolled into a tubular shape and having a plurality of circles spaced from each other along a longitudinal axis to form an Archimedean spiral cross-section perpendicular to the longitudinal axis.

In another example, the metallic wick assembly generally includes the sleeve member has a plurality of apertures, with the sleeve member delimited first and second sections at two opposite ends thereof, with the plurality of apertures arranged at the first section to provide fuel passing therethrough and drawn up freely to the first end of the mesh member.

Preferably, the first section of the sleeve member is arranged adjacent to the first end of the mesh member and has a fifth length. The second section of the sleeve member is arranged adjacent to the second end of the mesh member and has a sixth length. The fifth length is less than the sixth length.

Preferably, the range of the ratio of the fifth length to the sixth length is 0.3 to 0.5.

In another example, the metallic wick assembly includes a plurality of mesh members respectively rolled into the plurality of different-sized tubes assembled and radially spaced from each other along a longitudinal axis to form a concentric circular cross section perpendicular to the longitudinal axis.

In a further example, the metallic wick assembly includes a plurality of mesh members spaced from each other and arranged in a longitudinal stacked array.

Preferably, each of the plurality of mesh members is formed in a flat shape.

Preferably, the sleeve member is made of metal and formed in a rectangular tubular shape.

An advantage of the metallic wick assembly according to the present invention is that the sleeve member is slidable with respect to the mesh member to adjust the third length for controlling the flame scale.

Another advantage of the metallic wick assembly according to the present invention is that the sleeve member is slidably mounted around the mesh member to prevent the mesh member unassembled.

A further advantage of the metallic wick assembly according to the present invention is that the sleeve member has the plurality of apertures to provide fuel passing therethrough and drawn up freely to the first end of the mesh member.

A further advantage of the metallic wick assembly according to the present invention is that the sleeve member is slidably mounted around the mesh member, so that they are assembled each other easily and quickly.

A further advantage of the metallic wick assembly according to the present invention is that the metallic wick assembly is made of metal, so that it cannot be carbonized or consumed to maintain a fixed shape and height thereof to maintain the flame combustion scale.

A further advantage of the metallic wick assembly according to the present invention is that the mesh member has an end producing the flame thereon and heated by the flame to cause fuel drawn to the end thereof vaporized and combusted more completely due to higher wick temperature.

A further advantage of the metallic wick assembly according to the present invention is that the number of circles, the size of meshes the surface roughness and the coating materials of the mesh member are adjustable to control ability of capillary action adapted for wicking various fuels with different viscosity, so that the metallic wick assembly can draw more viscous fuel faster to the tip thereof and can be ignited shortly (one minute or less) after inserting the wick in fuel.

A further advantage of the metallic wick assembly according to the present invention is that the metallic wick assembly does not loosen at a terminal end of the mesh member after cutting a predetermined length or trimming to be mounted on the lamp device easily.

A further advantage of the metallic wick assembly according to the present invention is that the metallic wick assembly is made of metal reducing manufacturing costs to provide a popular price, in a preferred form, the mesh member can be formed by a common metal wire mesh and the sleeve member can be formed by a common metal tube.

The present invention will become clearer in light of the following detailed description of illustrative embodiments of this invention described in connection with the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The illustrative embodiments may best be described by reference to the accompanying drawings where:

FIG. 1 shows a perspective view of a metallic wick assembly of a first embodiment according to the present invention.

FIG. 2 shows an exploded, perspective view of the metallic wick assembly of FIG. 1.

FIG. 3 shows a cross-section view of the metallic wick assembly of FIG. 1.

FIG. 4 shows a perspective view of the metallic wick assembly of FIG. 1, and illustrates the metallic wick assembly mounted to a lamp device.

FIG. 5 shows an exploded, perspective view of FIG. 4.

FIG. 6 shows a cross-section view of FIG. 4, and illustrates the flame scale being larger.

FIG. 7 shows a partial, enlarged cross-section view of FIG. 6.

FIG. 8 shows a cross-section view of FIG. 4, and illustrates the flame scale being smaller.

FIG. 9 shows a perspective view of the metallic wick of FIG. 1, and illustrates three metallic wicks mounted to another lamp device.

FIG. 10 shows an exploded, perspective view of the metallic wick of FIG. 9.

FIG. 11 shows a cross-section view of FIG. 9.

FIG. 12 shows an exploded, perspective view of the lamp device of FIG. 9.

FIG. 13 shows a cross-section view taken along line 13-13 of FIG. 12.

FIG. 14 shows a continued view of FIG. 13, and illustrates a film detached from a cap of the lamp device.

FIG. 15 shows a perspective view of a metallic wick assembly of a second embodiment according to the present invention.

FIG. 16 shows an exploded, perspective view of the metallic wick assembly of FIG. 15.

FIG. 17 shows a perspective view of the metallic wick assembly of FIG. 15, and illustrates the metallic wick assembly mounted to the lamp device and the flame scale being larger.

FIG. 18 shows a perspective view of the metallic wick assembly of FIG. 15, and illustrates the metallic wick assembly mounted to a lamp device and the flame scale being smaller.

FIG. 19 shows a perspective view of a metallic wick assembly of a third embodiment according to the present invention.

FIG. 20 shows an exploded, perspective view of the metallic wick assembly of FIG. 19.

FIG. 21 shows a cross-section view of the metallic wick assembly of FIG. 19.

FIG. 22 shows a perspective view of a metallic wick assembly of a fourth embodiment according to the present invention.

FIG. 23 shows an exploded, perspective view of the metallic wick assembly of FIG. 22.

FIG. 24 shows a cross-section view of the metallic wick assembly of FIG. 22.

All figures are drawn for ease of explanation of the basic teachings only; the extensions of the figures with respect to number, position, relationship, and dimensions of the parts to form the illustrative embodiments will be explained or will be within the skill of the art after the following teachings have been read and understood. Further, the exact dimensions and dimensional proportions to conform to specific force, weight, strength, and similar requirements will likewise be within the skill of the art after the following teachings have been read and understood.

Where used in the various figures of the drawings, the same numerals designate the same or similar parts. Furthermore, when the terms “first”, “second”, “third”, “fourth”, “end”, “portion”, “longitudinal”, “radial”, “diameter”, “width”, “thickness”, and similar terms are used herein, it should be understood that these terms have reference only to the structure shown in the drawings as it would appear to a person viewing the drawings and are utilized only to facilitate describing the illustrative embodiments.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIGS. 1 through 3 show a first embodiment of a metallic wick assembly according to the present invention shown in the drawings. The metallic wick assembly 1 generally includes a mesh member 10 and a sleeve member 20 mounted around the mesh member 10. The mesh member 10 is rolled into a tubular shape and having a plurality of circles spaced from each other along a longitudinal axis A to form an Archimedean spiral cross-section perpendicular to the longitudinal axis A. The mesh member 10 includes first and second ends 11 and 12 disposed opposite to each other along the longitudinal axis A, and first and second surfaces 13 and 14 respectively extended from the first end 11 to the second end 12 thereof and arranged opposite to each other. Furthermore, the mesh member 10 essentially includes a plurality of metallic wires interlacing and overlapping each other to form into a plurality of meshes 15 penetrating the first and second surfaces 13 and 14 between the first and second ends 11 and 12 thereof. Each of the plurality of meshes 15 is formed in a quadrilateral shape, such as square or rhombus. Moreover, the mesh member 10 has the plurality of circles winding around the longitudinal axis A at continuously increasing radial distance from the longitudinal axis A to form a transport channel 16 extending from the first end 11 to the second end 12 thereof along the longitudinal axis A. The transport channel 16 includes a central section 17 disposed adjacent to the longitudinal axis A and an annular section 18 connected with and winding around the central section 17. The first surface 13 of the innermost one of the plurality of circles is arranged around the longitudinal axis A to form the central section 17. The first and second surfaces 13 and 14 of the other circles facing each other except the innermost one are defined with the annular section 18. The first surface 13 of the outermost one of the plurality of circles is connected with and abutted against the second surface 14 of the other circle arranged adjacent to the outermost one.

The sleeve member 20 is made of metal and formed in a tubular shape. The sleeve member 20 is slidably mounted around the mesh member 10 to prevent the mesh member 10 restored from the tubular shape to a flat shape. Moreover, the second surface 14 of the mesh member 10 is closely abutted against an inner periphery of the sleeve member 20 by elastic restoring force thereof to prevent the mesh member 10 inadvertently sliding with respect to the sleeve member 20.

FIGS. 4 through 8 show the mesh member 10 cut into a predetermined length and the metallic wick assembly 1 mounted to a lamp device 2. The lamp device 2 includes a fuel tank 21 and a cap 22 removably mounted on an open end of the fuel tank 21. The cap 22 has an essentially circular cross section and includes a bottom portion 221, a through hole 222 longitudinally extending through the bottom portion 221, an annular wall portion 223 formed around a periphery of the bottom portion 221, and an abutted portion 224 formed around a periphery of the through hole 222 and extending opposite to the bottom portion 221. The metallic wick assembly 1 is inserted through the through hole 222 of the cap 22 and contacts with fuel 23 stored in the fuel tank 21. The bottom portion 221 hinders the flame produced at the first end 11 to ignite fuel 23. The annular wall portion 223 provides windproof function. The abutted portion 224 abuts against the metallic wick assembly 1 to keep the metallic wick assembly 1 maintaining in an upright position. Thus, fuel 23 is drawn from the second end 12 to the first end 11 of the metallic wick assembly 1 via the transport channel 16 by capillary action between the plurality of meshes 15, the central and annular sections 16 and 17 to reach the flame produced at the first end 11 it then vaporizes and combusts. Moreover, the size of each of the plurality of meshes 15 is unchanged or only has a very small deformation when the mesh member 10 is rolled into the plurality of circles, so that appearance factors of the metallic wick assembly 1, such as height and diameter are practically unchanged to cause that the metallic wick assembly 1 can precisely maintain the flame scale during combustion. Furthermore, the transport channel 16 can be adjusted to transfer fuel 23 quickly for igniting, even for high viscosity fuels.

Furthermore, the mesh member 10 includes a first length L1 defined between the first and second ends 11 and 12 thereof. The sleeve member 20 includes a second length L2 defined between two longitudinal opposite ends thereof. The second length L2 of the sleeve member 20 is less than the first length L1 of the mesh member 10.

A third length L3 is defined between a distal end of the sleeve member 20 and the first end 11 of the mesh member 10. A fourth length L4 is defined between another distal end of the sleeve member 20 arranged adjacent to the second end 12 of the mesh member 10 and a bottom surface of the fuel tank 21 to provide fuel 23 entering into the mesh member 10. Additionally, the fourth length L4 is greater than zero. Moreover, the sleeve member 20 is slidable with respect to the mesh member 10 to adjust the third length L3 for controlling the flame scale. When the third length L3 is greater (shown in FIG. 6), the first end 11 of the mesh member 10 can contact with more air to cause fuel 23 igniting and reacting with more oxygen, so that the flame scale is larger. Conversely when the third length L3 is less (shown in FIG. 8), the first end 11 of the mesh member 10 can contact with less air to cause fuel 23 igniting and reacting with less oxygen, so that the flame scale is smaller. The fourth length L4 is changed in relation to the third length L3 to provide fuel 23 entering into the mesh member 10.

FIGS. 9 through 14 show three metallic wick assembly 1 respectively cut into a predetermined length and mounted to another lamp device 2a. The lamp device 2a includes a fuel tank 21a and a cap 22a formed integrally as a single piece. The cap 22a has an essentially circular cross section and includes a bottom portion 221a, a through hole 222a longitudinally extending through the bottom portion 221a. A pull tab 23 a is removably connected to and close the through hole 222a to avoid fuel 23 leaking out of the fuel tank 21a. The pull tab 23a has a ring 231a. A film 24a is removably connected to one end of the cap 22a and opposite to the bottom portion 221a. A user can hooks his/her finger through the ring 231a and remove the pull tab 23a from the through hole 222a, so that the through hole 222a is interconnected with an open end of the fuel tank 21a.

The lamp device 2a further includes a supporting assembly 3 mounted on the cap 22a. The supporting assembly 3 includes a fixing member 31 and a shield member 32. The fixing member 31 is connected to the bottom portion 221a of the cap 22a and has a through bore 311 communicated with the through hole 222a of the cap 22a. The shield member 32 is mounted into the through bore 311 of the fixing member 31. The shield member 32 includes a bottom section 321, three connecting holes 322 longitudinally extending through the bottom section 321, and a wall section 323 formed around a periphery of the bottom section 321. The three connecting holes 322, the through hole 222a of the cap 22a, and the open end of the fuel tank 21a are interconnected to each other, and the three metallic wick assemblies 1 respectively insert therethrough. Thus, fuel 23 is drawn from the second end 12 to the first end 11 of each of the three metallic wick assemblies 1 via the transport channel 16 by capillary action between the plurality of meshes 15. The bottom section 321 hinders the flame produced at the first end 11 to ignite fuel 23. The wall section 323 provides windproof function.

FIGS. 15 through 18 show a second embodiment of the metallic wick assembly. Specifically, the second embodiment of the metallic wick assembly 1a generally includes a mesh member 10 and a sleeve member 20a mounted around the mesh member 10. The structure of the mesh member 10 is similar to the first embodiment substantially.

The sleeve member 20a is made of metal and formed in a tubular shape. The sleeve member 20a is slidably mounted around the mesh member 10 and has a plurality of apertures 201a. The sleeve member 20a is delimited first and second sections 202a and 203a at two opposite ends thereof. The plurality of apertures 201a is arranged at the first section 202a to provide fuel 23 passing therethrough and drawn up freely to the first end 11 of the mesh member 10. The first section 202a of the sleeve member 20a is arranged adjacent to the first end 11 of the mesh member 10 and has a fifth length L5. The second section 203a of the sleeve member 20a is arranged adjacent to the second end 12 of the mesh member 10 and has a sixth length L6. The fifth length L5 is less than the sixth length L6 (shown in FIG. 12). In a preferred form, the range of the ratio of the fifth length L5 to the sixth length L6 is 0.3 to 0.5.

FIGS. 19 through 21 show a third embodiment of the metallic wick assembly. Specifically, the third embodiment of the metallic wick assembly 1b generally includes a plurality of mesh members 10a and a sleeve member 20 mounted around the plurality of mesh members 10a. The structure of the mesh member 20 is similar to the first embodiment substantially. The plurality of mesh members 10a are respectively rolled into the plurality of different-sized tubes assembled and radially spaced from each other along a longitudinal axis A1 to form a concentric circular cross section perpendicular to the longitudinal axis A1. Each of the plurality of mesh members 10a includes with first and second ends 11a and 12a disposed opposite to each other along the longitudinal axis A1, and first and second surfaces 13a and 14a respectively extended from the first end 11a to the second end 12a thereof and arranged opposite to each other. Each of the plurality of mesh members 10a further includes two side edges 101a extending from the first end 11a to the second end 12a and connected with each other. Furthermore, each of the plurality of mesh members 10a essentially includes a plurality of metallic wires interlacing and overlapping each other to form into a plurality of meshes 15a penetrating between the first and second ends 11a and 12a thereof. Each of the plurality of meshes 15a is formed in a rhombus shape. Moreover, the plurality of mesh members 10a are radially spaced from each other to form a transport channel 16a extending from the first end 11a to the second end 12a thereof along the longitudinal axis A1. The transport channel 16a includes a central section 17a disposed adjacent to the longitudinal axis A1 and a plurality of annular sections 17a surrounding the central section 17a. The first surface 13a of the innermost one of the plurality of mesh members 10a arranged around the longitudinal axis A1 to form the central section 17a. The first and second surfaces 13a and 14a of the other mesh members 10a facing and spaced from each other except the innermost one are defined with the annular sections 17a.

FIGS. 22 through 24 show a fourth embodiment of the metallic wick assembly. Specifically, the fourth embodiment of the metallic wick assembly 1c generally includes a plurality of mesh members 10b and a sleeve member 20b mounted around the plurality of mesh members 10b. The plurality of mesh members 10b are spaced from each other and arranged in a longitudinal stacked array to form a rectangular cross section. Each of the plurality of mesh members 10b is formed in a flat shape and includes first and second ends 11b and 12b disposed opposite to each other, and first and second surfaces 13b and 14b respectively extended from the first end 11b to the second end 12b thereof and arranged opposite to each other. Furthermore, each of the plurality of mesh members 10b essentially includes a plurality of metallic wires interlacing and overlapping each other to form into a plurality of meshes 15b penetrating between the first and second ends 11b and 12b thereof. Moreover, the plurality of mesh members 10b are spaced from each other to form a transport channel 16b extending from the first end 11b to the second end 12b thereof.

The sleeve member 20b is made of metal and formed in a rectangular tubular shape corresponding to the rectangular cross section of the mesh member 10b. The sleeve member 20b is slidably mounted around the mesh member 10b to prevent the plurality of the mesh members 10b unassembled each other.

The metallic wick according to the present invention includes the following advantages:

1. The metallic wick assembly 1; 1a; 1b; 1c includes the sleeve member 20; 20a; 20b being slidable with respect to the mesh member 10; 10a; 10b to adjust the third length L3 for controlling the flame scale.

2. The metallic wick assembly 1; 1a; 1b; 1c includes the sleeve member 20; 20a; 20b slidably mounted around the mesh member 10; 10a; 10b to prevent the mesh member 10; 10a; 10b unassembled.

3. The metallic wick assembly 1; 1a; 1b; 1c includes the sleeve member 20; 20a; 20b having the plurality of apertures 201a to provide fuel 23 passing therethrough and drawn up quickly to the first end 11; 11a; 11b of the mesh member 10; 10a; 10b.

4. The metallic wick assembly 1; 1a; 1b; 1c includes the sleeve member 20; 20a; 20b slidably mounted around the mesh member 10; 10a; 10b, so that they are assembled each other easily and quickly.

5. The metallic wick assembly 1; 1a; 1b; 1c is made of metal, so that it cannot be carbonized or consumed to maintain fixed shape and height thereof to maintain the flame combustion scale.

6. The metallic wick assembly 1; 1a; 1b; 1c includes the mesh member 10; 10a; 10b having an end producing the flame thereon and heated by the flame to cause fuel drawn to the end thereof vaporized and combusted more completely due to higher wick temperature.

7. The number of circles, the size of meshes 15; 15a; 15b, the surface roughness and the coating materials of the mesh member 10; 10a; 10b are adjustable to control ability of capillary action adapted for wicking various fuels with different viscosity, so that the metallic wick assembly 1; 1a; 1b; 1c can draw more viscous fuel faster to the tip thereof and can be ignited shortly (one minute or less).

8. The metallic wick assembly 1; 1a; 1b; 1c does not loosen at a terminal end of the mesh member 10; 10a; 10b after cutting a predetermined length or trimming to be mounted on the lamp device 2; 2a easily.

9. The metallic wick assembly 1; 1a; 1b; 1c is made of metal reducing manufacturing costs to provide a popular price, in a preferred form, the mesh member 10; 10a; 10b can be formed by a common metal wire mesh and the sleeve member 20; 20a; 20b can be formed by a common metal tube.

Thus since the illustrative embodiments disclosed herein may be embodied in other specific forms without departing from the spirit or general characteristics thereof, some of which forms have been indicated, the embodiments described herein are to be considered in all respects illustrative and not restrictive. The scope is to be indicated by the appended claims, rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are intended to be embraced therein.

Claims

1. A metallic wick assembly comprising: at least one mesh member including first and second ends disposed opposite to each other, first and second surfaces respectively extended from the first end to the second end thereof and arranged opposite to each other, a plurality of meshes penetrating the first and second surfaces between the first and second ends thereof, and a transport channel extending from the first end to the second end thereof drawing fuel by capillary action, with the mesh member including a first length defined between the first and second ends thereof; anda sleeve member mounted around the mesh member and including a second length defined between two longitudinal opposite ends thereof, with the second length being less than the first length;wherein a third length is defined between a distal end of the sleeve member and the first end of the mesh member, with the sleeve member being slidable with respect to the mesh member to adjust the third length for controlling the flame scale.

2. The metallic wick assembly as claimed in claim 1, wherein the mesh member is rolled into a tubular shape and having a plurality of circles spaced from each other along a longitudinal axis, with the plurality of circles winding around the longitudinal axis to form an Archimedean spiral cross-section perpendicular to the longitudinal axis at continuously increasing radial distance from the longitudinal axis to form the transport channel.

3. The metallic wick assembly as claimed in claim 2, wherein the transport channel includes a central section disposed adjacent to the longitudinal axis and an annular section connected with and winding around the central section.

4. The metallic wick assembly as claimed in claim 1, wherein the sleeve member has a plurality of apertures, with the sleeve member delimited first and second sections at two opposite ends thereof, with the plurality of apertures arranged at the first section to provide fuel passing therethrough and drawn up quickly to the first end of the mesh member.

5. The metallic wick assembly as claimed in claim 1, includes a plurality of mesh members respectively rolled into the plurality of different-sized tubes assembled and radially spaced from each other along a longitudinal axis to form a concentric circular cross section perpendicular to the longitudinal axis.

6. The metallic wick assembly as claimed in claim 5, wherein each of the plurality of mesh members further includes two side edges extending from the first end to the second end and connected with each other.

7. The metallic wick assembly as claimed in claim 1, includes a plurality of mesh members spaced from each other and arranged in a longitudinal stacked array.

8. The metallic wick assembly as claimed in claim 7, wherein each of the plurality of mesh members is formed in a flat shape.

9. The metallic wick assembly as claimed in claim 7, wherein the sleeve member is made of metal and formed in a rectangular tubular shape.

10. A lamp device comprising: a metallic wick assembly including at least one mesh member and a sleeve member, with the at least one mesh member including first and second ends disposed opposite to each other, first and second surfaces respectively extended from the first end to the second end thereof and arranged opposite to each other, a plurality of meshes penetrating the first and second surfaces between the first and second ends thereof, and a transport channel extending from the first end to the second end thereof drawing fuel by capillary action, with the mesh member including a first length defined between the first and second ends thereof, with the sleeve member mounted around the mesh member and including a second length defined between two longitudinal opposite ends thereof, with the second length being less than the first length, with a third length being defined between a distal end of the sleeve member and the first end of the mesh member, with the sleeve member being slidable with respect to the mesh member to adjust the third length for controlling the flame scale;a fuel tank adapted to store fuel; anda cap connected to an open end of the fuel tank;wherein the metallic wick assembly is inserted through the cap and contacts with fuel, with fuel to be drawn from the second end to the first end of the mesh member via the transport channel by capillary action to reach flame produced at the first end of the mesh member.

11. The lamp device as claimed in claim 10, wherein the mesh member is rolled into a tubular shape and having a plurality of circles spaced from each other along a longitudinal axis, with the plurality of circles winding around the longitudinal axis to form an Archimedean spiral cross-section perpendicular to the longitudinal axis at continuously increasing radial distance from the longitudinal axis to form the transport channel.

12. The lamp device as claimed in claim 11, wherein the transport channel includes a central section disposed adjacent to the longitudinal axis and an annular section connected with and winding around the central section.

13. The lamp device as claimed in claim 11, wherein the sleeve member has a plurality of apertures, with the sleeve member delimited first and second sections at two opposite ends thereof, with the plurality of apertures arranged at the first section to provide fuel passing therethrough and drawn up fleetly to the first end of the mesh member.

14. The lamp device as claimed in claim 10, wherein the metallic wick assembly includes a plurality of mesh members respectively rolled into the plurality of different-sized tubes assembled and radially spaced from each other along a longitudinal axis to form a concentric circular cross section perpendicular to the longitudinal axis.

15. The lamp device as claimed in claim 10, wherein metallic wick assembly includes a plurality of mesh members spaced from each other and arranged in a longitudinal stacked array.

16. The lamp device as claimed in claim 15, wherein each of the plurality of mesh members is formed in a flat shape.

17. The lamp device as claimed in claim 10, wherein the cap includes a bottom portion, a through hole longitudinally extending through the bottom portion, with the metallic wick assembly inserting through the through hole of the cap and connects with fuel stored in the fuel tank.

18. The lamp device as claimed in claim 17, wherein the cap further includes an annular wall portion formed around a periphery of the bottom portion, and an abutted portion formed around a periphery of the through hole and extending opposite to the bottom portion.

19. The lamp device as claimed in claim 17, wherein the fuel tank and the cap are formed integrally as a single piece, with a pull tab removably connected to and close the through hole to avoid fuel leaking out of the fuel tank, with a film removably connected to one end of the cap opposite to the bottom portion.

20. The lamp device as claimed in claim 19, wherein a supporting assembly is mounted on the cap and includes a fixing member and a shield member, with the fixing member connected to the bottom portion of the cap and having a through bore communicated with the through hole of the cap, with the shield member mounted into the through bore of the fixing member and including a bottom section, a connecting hole extending through the bottom section, and a wall section formed around a periphery of the bottom section, with the connecting hole, the through hole of the cap, and the open end of the fuel tank being interconnected to each other.