Spark prevention device

Abstract

To provide a spark prevention tool used in arc welding work, which can suppress the scattering of sparks while pressing and fixing a material to be welded. [Solution] The spark arrestor 1 comprises a rod 10 with a gripping portion 11 at one end and a pressing portion 12 at the other end, a metal cover 20 attached midway to the rod 10, and a flame-retardant sheet 30 attached in a hanging state along the periphery of the cover 20. The cover 20 has a flat top plate 21 that is perpendicular to the rod 10, and an inclined wall 22 that is inclined downward and widens from the periphery of the top plate 21. The top plate 21 is provided with an attachment means for passing the rod 10 through it to attach it to the rod 10, and the inclined wall 22 is provided with a hook 23 for attaching the flame-retardant sheet 30.

Description

[Technical Field]

[0001] The present invention relates to a spark arrestor that prevents the scattering of sparks and the like that occur during arc welding. [Background technology]

[0002] Arc welding is frequently performed at construction sites for steel structures and other structures. During this welding process, sparks fly, so great care must be taken to prevent fires caused by these sparks. In particular, molten metal particles known as "slag" can fly far away while still at a high temperature, potentially causing an unexpected fire.

[0003] In order to prevent this "slag" from scattering, many methods have been proposed for quickly collecting the "slag" that has been generated.

[0004] For example, at a work site where pipes are arc-welded, it has been proposed to provide a hanging spark catcher near the pipes to be arc-welded (see, for example, Patent Document 1). This spark catcher is umbrella-shaped, with the umbrella portion made of a fireproof sheet and a hook at the base end of the handle for hanging on the pipes, and by hanging it upside down on the pipes, the umbrella portion catches falling sparks. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-229685 Summary of the Invention [Problem to be solved by the invention]

[0006] The inventors have been performing work to secure the deck plate by arc welding. When performing this work, a locking protrusion is provided at a predetermined position on the frame to which the deck plate is attached, and the deck plate is positioned so that the through-holes in the deck plate are aligned with the protrusion, and the deck plate is fixed to the frame by arc welding at the through-holes.

[0007] In this welding work, the deck plate itself acts as a spark shield, preventing sparks from flying downward, eliminating the need for a spark catcher below the welded area as described above. Instead, care must be taken to prevent sparks from flying horizontally across the surface of the deck plate.

[0008] Furthermore, when performing this welding work, it was necessary to perform the arc welding while pressing the deck plate firmly against the frame to prevent any gaps from forming between the deck plate and the frame. Therefore, the worker performing the arc welding first crouched down to make it easier to see the welding point, and then used his or her own weight to hold down the deck plate with one foot, or held down the deck plate with an appropriate rod-shaped object, while performing the arc welding.

[0009] Performing this work of holding down the deck plate and welding at the same time while also paying attention to flying sparks was not only physically tiring for the workers, but also mentally exhausting. In particular, the workers had to repeatedly crouch down and stand up every time they performed welding, which put a lot of strain on their legs and lower back. Moreover, because the workers had to hold down the deck plate with one foot or one hand, they had to perform arc welding in a slightly unnatural position, which placed additional strain on their bodies.

[0010] Therefore, the inventors were investigating a work method that would make it easier to fix the workpieces to be welded and perform the welding work while suppressing the scattering of sparks that occur during arc welding, and they came up with the invention of the spark prevention device of the present invention.

[0011] In other words, the present invention aims to provide a spark prevention device for use during arc welding work, which is capable of suppressing the scattering of sparks while pressing and fixing the material to be welded. [Means for solving the problem]

[0012] The spark arrestor of the present invention is a spark arrestor comprising a rod having a gripping portion at one end and a pressing portion at the other end, a metal cover attached to the middle of the rod, and a flame-retardant sheet attached in a hanging state along the periphery of the cover.

[0013] Furthermore, the flower scattering prevention device of the present invention is characterized in the following respects. (1) The cover has a flat top plate that is perpendicular to the rod and an inclined wall that is inclined downward from the periphery of the top plate, and the top plate is provided with an attachment means for passing the rod through and attaching it to the rod, and the inclined wall is provided with a hook for attaching a flame-retardant sheet. (2) The inclined wall portion is provided with an arm that clamps and secures the flame-retardant sheet attached to the hook together with the inclined wall portion. (3) The edge of the inclined wall portion is provided with a plurality of small guide pieces extending downward, and the guide pieces make it possible to adjust the hanging position of the flame-retardant sheet. (4) The flame-retardant sheet is a strip-shaped sheet that can be attached and detached from the cover. [Effects of the Invention]

[0014] According to the present invention, a spark arrester is provided that includes a rod having a gripping portion at one end and a pressing portion at the other end, a metal cover attached to the middle of the rod, and a flame-retardant sheet attached in a hanging state along the periphery of the cover. This allows welding work to be performed while holding down the workpiece with the rod. In particular, unlike conventional methods, the worker does not need to crouch, eliminating the need to repeatedly crouch and stand for each welding operation. That is, when holding down the workpiece with the rod, the worker stands and applies his or her weight to the rod, thereby holding down the workpiece with the rod while the rod supports the worker. The worker can perform arc welding while standing and supported by the rod. Furthermore, the worker's standing position is flexible, allowing him or her to choose a position that is comfortable for arc welding. This significantly reduces the worker's physical fatigue. Furthermore, sparks generated by welding work can be prevented from flying by a flame-retardant sheet attached to the rod via a cover, allowing welding work to be performed without paying attention to flying sparks, which also reduces the mental fatigue of the worker. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is an explanatory diagram of a spark prevention device according to an embodiment of the present invention. FIG. [Figure 2] FIG. 2 is a partially cutaway explanatory view of the main part of the spark arrestor of the present embodiment. [Figure 3] 1 is an explanatory diagram of a main part of a spark prevention device according to an embodiment of the present invention. FIG. [Figure 4] 1 is an explanatory diagram of a main part of a spark prevention device according to an embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] As shown in Fig. 1, the spark arrestor of the present invention is a spark arrestor 1 comprising a rod 10 of a predetermined length with a gripping part 11 at one end and a pressing part 12 at the other end, a metal cover 20 attached to the middle of the rod 10, and a flame-retardant sheet 30 attached in a hanging state along the periphery of the cover 20. The flame-retardant sheet 30 is a so-called spatter sheet.

[0017] The rod 10 is made of metal, has a predetermined length, and is strong enough to support the weight of the worker. In this embodiment, a commonly available walking stick is used.

[0018] Therefore, the grip 11 is a grip that intersects with the rod 10 in a T-shape, and has an S-curved shape that is easy to grip and to put weight on. Note that the grip 11 is not limited to the shape of a walking stick grip, but may be a linear grip that continues in a continuous line in the longitudinal direction of the rod, like a ski pole.

[0019] A strap 13 is attached near the grip 11. The strap 13 is one of the means for preventing the equipment from falling when working at height, and by hanging it around the worker's wrist, it is possible to prevent the spark arrestor 1 from falling.

[0020] In this embodiment, the pressing portion 12 is a rubber cap attached to the end of the rod 10. By making the pressing portion 12 out of rubber, when pressing the material to be welded, such as a deck plate, via the rod 10, it does not slip and can effectively press the vicinity of the welded portion.

[0021] 2, the cover 20 is dome-shaped and is composed of a flat top plate 21 that is perpendicular to the rod 10 and an inclined wall 22 that is inclined downward and diverges from the periphery of the top plate 21. Both the top plate 21 and the inclined wall 22 are made of metal, and in particular, stainless steel in this embodiment.

[0022] The top plate portion 21 may be circular in plan view, but in this embodiment, it is cut off at about one-third of its diameter to form a one-sided circular shape, as shown in Fig. 1. This cut-off portion serves as an insertion opening 2 for inserting a welding rod (not shown) when performing arc welding.

[0023] As shown in FIG. 2, a through-hole 21a through which the rod 10 passes is provided at the center of the top plate 21, which has a circular shape with a recessed side. A cylindrical guide wall 21b that communicates with the through-hole 21a is provided on the upper surface of the top plate 21. A setscrew 21c that is movable forward and backward in the radial direction of the cylindrical guide wall 21b is attached to the guide wall 21b. The guide wall 21b and the setscrew 21c form an attachment means for fixing the cover 20 to the rod 10. The cover 20 is movable forward and backward in the longitudinal direction of the rod 10 by inserting the rod 10 through the through-hole 21a and the guide wall 21b, and can be fixed and attached by the setscrew 21c at a predetermined height from the pressing portion 12 of the rod 10. When inserting the rod 10 into the through hole 21a and the guide wall 21b, the pressing portion 12 attached to the tip of the rod 10 is removed and the rod 10 is inserted into the guide wall 21b and the through hole 21a, and then the pressing portion 12 is reattached to the tip of the rod 10.

[0024] The guide wall 21b may be attached to the top plate 21 by overlapping a flange 21d provided at one end of the guide wall 21b with the top plate 21 and fixing them with appropriate bolts and nuts, or by welding.

[0025] As shown in Fig. 1, the inclined wall portion 22 provided on the cover 20 is provided along the arc-shaped periphery of the top plate portion 21. As shown in Figs. 2 to 4, a cylindrical wall 22a that is approximately parallel to the rod 10 is provided at the tip of the inclined wall portion 22. This cylindrical wall 22a is a part of the inclined wall portion 22 and is not provided in the cut-off portion of the top plate portion 21 described above, but is in the form of a partially cut-out cylinder. The cylindrical wall 22a does not necessarily have to be cylindrical and be approximately parallel to the rod 10, and may be flared downward.

[0026] 3, a plurality of hooks 23 are provided at predetermined intervals along the circumferential direction on the outer peripheral surface of the cylindrical wall 22a. These hooks 23 are used to attach the flame-retardant sheet 30 to the cover 20, as will be described later.

[0027] In particular, in this embodiment, hook 23 is formed by providing an inverted U-shaped cutting line (not shown) on cylindrical wall 22a to form a cut-out piece that is convex upward on a part of the vertical wall, and then bending this cut-out piece into a crank shape to form hook 23. That is, the base end of the cut-out piece is bent in the radial direction of cylindrical wall 22a, and then the middle part of the cut-out piece is bent so that the tip of the cut-out piece faces upward.

[0028] Additionally, cylindrical wall 22a is provided with overlapping arc-shaped arms 24 that extend along the outer circumferential surface of cylindrical wall 22a, as shown in Fig. 3. Arm 24 is made of a strip-shaped metal plate of a predetermined width, and as shown in Fig. 4, has a pivot 24a at one end and a snap lock 24b at the other end.

[0029] 3 and 4, the cylindrical wall 22a is provided with a bearing 25 for rotatably mounting the pivot 24a of the arm 24, and one end of the arm 24 is rotatably mounted to the cylindrical wall 22a. Also, as shown in Fig. 4, the cylindrical wall 22a is provided with an engagement protrusion 26 for engaging with the engagement hook 24c of the snap lock 24b of the arm 24. The other end of the arm 24 can be fixed to the cylindrical wall 22a by engaging the engagement hook 24c of the snap lock 24b with the engagement protrusion 26.

[0030] 3, a plurality of openings 24d are provided at predetermined intervals in arm 24, which is a band-shaped metal plate. These openings 24d are the positions of hooks 23 provided on cylindrical wall 22a when arm 24 is fixed to cylindrical wall 22a with snap locks 24b, and are positioned so as to prevent hooks 23 and arm 24 from coming into contact with each other.

[0031] 2 to 4, a plurality of small guide pieces 27 extend downward from the lower edge of the cylindrical wall 22a, which is the inclined wall portion 22. The guide pieces 27 are arranged side by side along the lower edge of the cylindrical wall 22a, and are inclined downward as a whole in a manner that widens outward.

[0032] The guide piece 27 is intended to adjust the hanging posture of the flame-retardant sheet 30 attached to the cylindrical wall 22a via the hook 23, as described below, and by adjusting the inclination angle of the guide piece 27, the degree of spread of the flame-retardant sheet 30 can be adjusted.

[0033] The flame-retardant sheet 30 is a strip-shaped sheet body, and has hook insertion holes 30a at predetermined positions through which the hooks 23 of the cylindrical wall 22a are inserted, as shown in Fig. 3. As shown in the cross-sectional view of Fig. 2, the flame-retardant sheet 30 is formed by overlapping adjacent flame-retardant sheets 30, so that no gaps are formed between adjacent flame-retardant sheets 30 and sparks generated by arc welding do not leak out through the gaps.

[0034] The flame-retardant sheet 30 attached to the cylindrical wall 22a by the hooks 23 can be firmly fixed by being sandwiched between the cylindrical wall 22a and the arms 24.

[0035] By using the spark arrestor 1, the flame-retardant sheet 30 becomes shorter, and when it has become shorter to a certain extent, the flame-retardant sheet 30 can be replaced.

[0036] In this way, the spark prevention device 1 of the present invention is composed of a rod 10 of a predetermined length with a gripping portion 11 at one end and a pressing portion 12 at the other end, a metal cover 20 attached to the middle of the rod 10, and a flame-retardant sheet 30 attached in a hanging state along the periphery of the cover 20, so that welding work can be performed while the material to be welded is held down by the rod 10.

[0037] In other words, a worker performing welding work on a deck plate to a frame can press the pressing part 12 of the spark prevention device 1 against the vicinity of the welding position and apply his / her weight to the rod 10, thereby pressing and fixing the deck plate via the spark prevention device 1.

[0038] At this time, the worker does not need to squat down, but simply bends forward while being supported by the spark prevention device 1, and by eliminating the need to repeatedly squat down and stand up, physical fatigue can be significantly reduced.

[0039] Furthermore, since the worker is free to choose his or her standing position, he or she can stand in a position that is convenient for welding work, which also greatly reduces physical fatigue.

[0040] An operator can insert a welding rod (not shown) for arc welding through the insertion opening 2 of the spark arrestor 1 to perform welding.

[0041] Sparks generated by welding work can be prevented from scattering by the flame-retardant sheet 30 attached to the rod 10 via the cover 20, and welding work can be performed without paying attention to scattering sparks, which also reduces the mental fatigue of the worker.

[0042] The flame-retardant sheet 30 is detachably attached to a hook 23 provided on the inclined wall 22 of the cover 20, and when the flame-retardant sheet 30 wears down and becomes short, it is only necessary to replace the flame-retardant sheet 30, and the sheet can be used stably for a long period of time. [Explanation of symbols]

[0043] 1 Spark prevention device 2 Insertion opening 10 rods 11 Gripping part 12 Pressing section 13 Strap 20 Cover 21 Top plate 21a Through hole 21b Guide Wall 21c Set screw 21d flange 22 Slanted wall section 22a Cylindrical wall 23 Hook 24 Arm 24a Axis 24b snap lock 24c Mooring Hook 25 bearings 26 Hanging protrusion 27 Guide piece 30 Flame-retardant sheet 30a Hook insertion hole

Claims

1. a rod having a gripping portion at one end and a pressing portion at the other end; a metal cover attached to the middle of the rod; a flame-retardant sheet attached in a hanging state along the periphery of the cover; A spark prevention device consisting of:

2. The cover is A flat top plate portion that is perpendicular to the rod; an inclined wall portion provided so as to be inclined downward from the peripheral edge of the top plate portion in an expanding manner; and The top plate portion is provided with an attachment means for inserting the rod therethrough and attaching the rod to the top plate portion; The inclined wall portion is provided with a hook for attaching the flame-retardant sheet. The spark arrestor according to claim 1.

3. The spark arrestor according to claim 2, wherein the inclined wall portion receives an arm that clamps and fixes the flame-retardant sheet attached to the hook together with the inclined wall portion.

4. A spark prevention device as described in claim 2, wherein a plurality of small guide pieces extending downward are provided on the edge of the inclined wall portion, and the guide pieces make it possible to adjust the hanging position of the flame-retardant sheet.

5. The spark arrestor according to any one of claims 1 to 4, wherein the flame-retardant sheet is a strip-shaped sheet that is detachably attached to the cover.

Images