Spark catcher

Abstract

The present invention provides a spark catcher that can be attached to a steel column in a stable state while preventing displacement or detachment during cutting, while improving work efficiency during the cutting process of the piece components. [Solution] The spark catcher 10, which includes a foldable support frame 11, a spark catcher 12, an arm member 18 extending from the upright frame portion 13B of the support frame 11 toward the steel column 1, and a fixing means 19 that can be attached to the steel column 1, is bent into a roughly L-shape and positioned below and behind the piece member 2 on the work surface 1A of the steel column 1. In this state, the first magnet 19A of the fixing means 19 provided on the horizontal frame portion 13A of the support frame 11 is attracted and attached to the work surface 1A of the steel column 1, and the second magnet 19B of the fixing means 19 provided on the extended end of the arm member 18 is attracted and attached to the back surface 1B of the steel column 1. As a result, the spark catcher 10 is fixed to the steel column 1 with the front side of the piece member 2 on the work surface 1A open.

Description

Technical Field

[0001] The present invention relates to a fire powder receiver that receives fire powder generated during cutting operations of piece members such as erection pieces and hanging fittings welded to steel columns.

Background Art

[0002] As the background art of the present invention, for example, there is a cutting and welding fireproof cover that prevents the scattering of cutting sparks generated when cutting metal members such as piece members. This cutting and welding fireproof cover is configured in a foldable manner from a foldable frame portion and a heat-resistant bag body provided on this frame portion. Also, in a use posture where the frame portion is bent into an L shape and the bag body is positioned below and behind the piece member, it has a plurality of magnets that are detachably fixed to the steel column. And as the plurality of magnets, in the use posture of the cutting and welding fireproof cover, a pair of magnets that adsorb the opposing portions facing the work target surface of the steel column on each of the horizontal frame portion and the standing frame portion to the work target surface of the steel column, and the tip portions of each band provided at the separation portions away from the work target surface of the steel column on each of the horizontal frame portion and the standing frame portion are adsorbed to the front (front face) and the back (rear face) located in front of the piece member on the work target surface of the steel column. By having a pair of magnets dispersed, it is configured to be able to be fixed to the steel column in the above-described use posture by four-point fixing by these magnets (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] According to the technology described in Patent Document 1, when performing cutting operations such as welding a piece member of a work surface from its front side, a band provided at the separation portion of the horizontal frame portion of the frame portion extends from that separation portion across the front of the piece member of the work surface, and its tip is fixed to the front part (front part) of the steel column with a magnet, which hinders cutting operations from the front side of the piece member, and therefore there is room for improvement in terms of workability.

[0005] In light of these circumstances, the main objective of the present invention is to provide a spark catcher that can be attached to a steel column in a stable state, preventing displacement or detachment of the spark catcher during the cutting of the piece members, while improving work efficiency by avoiding the attachment member of the spark catcher interfering with the cutting of the piece members. [Means for solving the problem]

[0006] The first characteristic configuration of the present invention is a spark catcher for receiving sparks generated during the cutting of piece members welded to a steel column, It is constructed in a foldable manner from a support frame formed by foldably connecting both ends of a pair of frame members that form an opening, and a spark catcher supported by the support frame when the support frame is in the state of an opening. In a usage configuration in which the support frame is bent into a substantially L-shape, with one of the pair of frame members being a horizontal frame portion and the other being an upright frame portion, and the support frame and the spark receiver are positioned below and behind the piece member present on the work surface of the steel column, the support frame is provided with an arm member extending from the upper end of the upright frame portion toward the steel column, and a magnetic fixing means that is detachably fixed to the steel column. The fixing means is such that, in the state of use, the support frame and the spark receiver are fixed to the steel column with the front side of the piece member of the work surface open, by a first magnet provided on the horizontal frame portion which attracts and attaches the horizontal frame portion to the work surface of the steel column, and a second magnet provided on the extended end of the arm member which attracts and attaches the extended end to the back surface of the steel column which extends in a direction perpendicular to the work surface behind the piece member of the work surface.

[0007] With this configuration, when attaching the spark catcher to a steel column, the horizontal frame portion of the spark catcher, which catches sparks that scatter below the piece member during the cutting of the piece member to the steel column, can be attached to the work surface of the steel column by a first magnet provided on the horizontal frame portion. In addition, the upright frame portion of the spark catcher, which catches sparks that scatter behind the piece member, can be attached to the back of the steel column by a second magnet provided on the extended end of the arm member that extends from the upper end of the upright frame portion towards the steel column.

[0008] Furthermore, by attaching the spark catcher to the steel column with this joint structure using the first and second magnets, a suitable mounting configuration for the spark catcher can be obtained that effectively catches sparks scattered behind or below the piece during cutting, without the support frame's arm members interfering with cutting operations from the front of the piece on the work surface.

[0009] Furthermore, by making the surfaces of the steel column to which each magnet is attached different—the working surface of the steel column and the back surface perpendicular to this working surface—it becomes difficult to cause swinging displacement of the spark catcher with the attachment point of one magnet as the pivot point, or for a force acting simultaneously on each magnet in the direction of peeling. As a result, even with a relatively simple joining structure using the first and second magnets, the spark catcher can be suitably attached to the steel column in a stable state, preventing displacement or detachment of the spark catcher during the cutting of the piece members.

[0010] In other words, by adopting a rational joining structure using the first and second magnets as described above, it is possible to provide a spark catcher that can be suitably attached to a steel column in a stable state, while preventing displacement or detachment of the spark catcher during the cutting of the piece members, thereby improving work efficiency.

[0011] A second characteristic feature of the present invention is that the first magnet is provided at the end of the horizontal frame portion opposite to the end portion that connects to the upright frame portion.

[0012] With this configuration, the adsorption connection points of the first magnet and the second magnet to the steel column can be separated as much as possible, thereby making it more effective to prevent swinging displacement of the spark catcher with the adsorption connection point of one of the magnets as the pivot point.

[0013] As a result, the stability of the spark catcher during the cutting of the piece components can be more effectively improved.

[0014] A third characteristic feature of the present invention is that the second magnet is attached to the extended end of the arm member via a posture adjustment unit so as to be able to adjust its posture.

[0015] According to this configuration, regardless of the upright angle of the upright frame portion with respect to the horizontal frame portion of the support frame, the adsorption joint surface of the second magnet on the upright frame portion side can be properly opposed to the back surface of the steel column by the posture adjustment by the posture adjustment portion, and the second magnet on the upright frame portion side can be preferably adsorbed and joined to the back surface of the steel column.

[0016] As a result, it is possible to provide a highly versatile fire powder receiver that can preferably adjust the upright angle of the upright frame portion with respect to the horizontal frame portion of the support frame according to the column width of the steel column or the like without impairing the stability of the fire powder receiver during the cutting operation of the piece member.

Brief Description of Drawings

[0017] [Figure 1] Front view showing the usage state of the fire powder receiver [Figure 2] Plan view showing the usage state of the fire powder receiver [Figure 3] Plan view showing the configuration of the fire powder receiver [Figure 4] Front view showing the configuration of the fire powder receiver

Mode for Carrying Out the Invention

[0018] Hereinafter, as an example of a mode for carrying out the present invention, an embodiment in which the fire powder receiver according to the present invention is applied to the case of cutting an erection piece, which is an example of a piece member welded to a steel column, will be described based on the drawings.

[0019] Note that the fire powder receiver according to the present invention is not limited to the case of cutting an erection piece, and can also be applied to, for example, the case of cutting a hanging fitting, which is an example of a piece member.

[0020] As shown in FIGS. 1 and 2, the fire powder receiver 10 according to the present invention is configured to be attached to the steel column 1 and receive the fire powder generated during the cutting operation of the erection piece 2 when, for example, cutting the erection piece 2 made of a steel pipe with a square cross-sectional shape for use in steel frame construction. Incidentally, reference numeral 3 shown in FIG. 1 is a cutting torch used for cutting the erection piece 2.

[0021] Regarding the configuration of the fire powder receiver 10 in detail, as shown in FIGS. 3 and 4, the fire powder receiver 10 is configured in a foldable manner having a support frame 11 that can be folded at the bisecting position and a single bag-shaped flameproof sheet 12 which is an example of a fire powder receiving body supported by the support frame 11 in a state where the support frame 11 serves as an opening (base). The support frame 11 is configured to be foldable by connecting both ends of a pair of frame members 13 formed in a U-shape capable of forming an opening 11A via hinges 14. The flameproof sheet 12 is supported by the support frame 11 in a state where it can be easily attached and detached from the support frame 11, for example, by winding and fixing its opening end portion around the support frame 11.

[0022] With the above configuration, when carrying the fire powder receiver 10, it can be easily carried in a compact state folded in half at the bisecting position of the support frame 11. Also, when the flameproof sheet 12 is damaged by a cutting burr or the like, the flameproof sheet 12 can be easily replaced with respect to the support frame 11.

[0023] As shown in FIGS. 3 and ④, each frame member 13 is formed in a U-shape of the same size by screw-connecting a pair of first bar members 15 arranged in parallel and a single second bar member 16 extending over one end thereof via an L-shaped flat hinge 17. For each of the bar members 15 and 16, stainless steel with a groove-shaped cross-sectional shape having a web and a pair of flanges is adopted.

[0024] Furthermore, the bar members 15 and 16 are not limited to stainless steel with a channel-shaped cross-section; for example, stainless steel with an L-shaped cross-section can also be used. In addition, the frame members 13 may be formed by welding the bar members 15 and 16 together in a U-shape, or they may be formed by bending a stainless steel pipe with a square or circular cross-section into a U-shape.

[0025] As shown in Figures 1-4, the spark catcher 10 is equipped with an arm member 18 extending from the upper end of the upright frame portion 13B toward the steel column 1, and a magnetic fixing means 19 that is detachably fixed to the steel column 1.

[0026] As shown in Figure 3, the arm member 18 is screw-fastened to the second bar member 16, which is the upper end of the upright frame portion 13B, via a T-shaped flat folding fitting 20. The arm member 18 is made of stainless steel with a grooved cross-section, having a web and a pair of flanges.

[0027] Furthermore, the arm member 18 is not limited to stainless steel with a channel-shaped cross-section; for example, stainless steel with an L-shaped cross-section or stainless steel pipe with a square cross-section can also be used. In addition, the arm member 18 may be, for example, welded to the upper end (second bar member 16) of the upright frame portion 13B.

[0028] As shown in Figures 1-4, the fixing means 19 includes a first magnet 19A (see Figures 2-3) provided on the horizontal frame portion 13A which attracts and attaches the horizontal frame portion 13A to the work surface 1A of the steel column 1, and a second magnet 19B provided on the extended end of the arm member 18 which attracts and attaches this extended end to the back surface 1B of the steel column 1, which extends in a direction perpendicular to the work surface 1A, behind the erection piece 2 of the work surface 1A (left side of the paper in Figures 1-2). In the usage state described above, the support frame 11 and the fire-resistant sheet 12 are fixed to the steel column 1 by the joining structure of the first magnet 19A and the second magnet 19B, with the front side of the erection piece 2 of the work surface 1A of the steel column 1 (right side of the paper in Figures 1-2) open.

[0029] With the above configuration, when attaching the spark catcher 10 to the steel column 1, the horizontal frame portion 13A side of the spark catcher 10, which catches sparks that scatter below the erection piece 2 during the cutting operation of the erection piece 2, can be attracted and attached to the lower side of the erection piece 2 on the work surface 1A of the steel column 1 by the first magnet 19A provided on the horizontal frame portion 13A. In addition, the upright frame portion 13B side of the spark catcher 10, which catches sparks that scatter behind the erection piece 2, can be attracted and attached to the back surface 1B of the steel column 1 located behind the erection piece 2 by the second magnet 19B provided on the extended end of the arm member 18 that extends from the upper end of the upright frame portion 13B toward the steel column 1.

[0030] Furthermore, by attaching the spark catcher 10 to the steel column 1 with this joint structure using the first magnet 19A and the second magnet 19B, a suitable mounting state for the spark catcher 10 can be obtained that effectively catches sparks that scatter behind or below the erection piece 2 during cutting, without the support frame 11's arm member 18 interfering with cutting operations from the front side of the erection piece 2 on the work surface 1A.

[0031] Furthermore, by making the surfaces of the steel column 1 to which the magnets 19A and 19B are attached different, such as the working surface 1A of the steel column 1 and the back surface 1B perpendicular to the working surface 1A, it is possible to prevent the spark catcher 10 from swinging or displacing with the attachment point of one of the magnets (first magnet 19A or second magnet 19B) as a fulcrum, and to prevent the simultaneous application of a peeling force to each of the magnets 19A and 19B. As a result, even with a relatively simple attachment structure using the first magnet 19A and the second magnet 19B, the spark catcher 10 can be suitably attached to the steel column 1 in a stable state, preventing displacement or detachment of the spark catcher 10 during the cutting of the erection piece 2.

[0032] In other words, by adopting a rational joining structure using the first magnet 19A and the second magnet 19B as described above, it is possible to provide a spark catcher 10 that can be suitably attached to the steel column 1 in a stable state, while preventing displacement or detachment of the spark catcher 10 during the cutting of the erection piece 2, thereby improving work efficiency, and preventing the spark catcher 10 from interfering with the cutting of the erection piece 2.

[0033] As shown in Figures 2-3, the first magnet 19A is provided at the end of the horizontal frame portion 13A opposite to the end that connects to the upright frame portion 13B. More specifically, the first magnet 19A is provided at the end of the first bar member 15 of the horizontal frame portion 13A facing the steel column 1, opposite to the end that connects to the upright frame portion 13B, in the state in which the spark catcher 10 described above is in use.

[0034] This configuration allows the suction connection points of the first magnet 19A and the second magnet 19B with respect to the steel column 1 to be separated as much as possible, thereby making it more effective to prevent swinging displacement of the spark catcher 10 with the suction connection point of one of the magnets (first magnet 19A or second magnet 19B) as the pivot point.

[0035] As a result, the stability of the spark catcher 10 during the cutting operation of the erection piece 2 can be more effectively improved.

[0036] As shown in Figures 1-4, the second magnet 19B is attached to the extended end of the arm member 18 via a posture adjustment section 21 so as to be able to adjust its posture. The posture adjustment section 21 has a support arm 22 made of flat steel that extends in a direction intersecting the arm member 18 and supports the second magnet 19B at one end, and a ball joint 23 interposed between the other end of the support arm 22 and the extended end of the arm member 18.

[0037] With this configuration, regardless of the upright angle of the upright frame portion 13B relative to the horizontal frame portion 13A of the support frame 11, the posture adjustment unit 21 can adjust the posture so that the suction bonding surface of the second magnet 19B on the upright frame portion 13B side is properly facing the back surface 1B of the steel column 1, thereby allowing the second magnet 19B on the upright frame portion 13B side to be suitably suction-bonded to the back surface 1B of the steel column 1.

[0038] As a result, a highly versatile spark catcher 10 can be provided that allows for the adjustment of the upright angle of the upright frame portion 13B relative to the horizontal frame portion 13A of the support frame 11, according to the column width of the steel column 1, without compromising the stability of the spark catcher 10 during the cutting of the erection piece 2.

[0039] Furthermore, the posture adjustment section 21 may be equipped with, for example, a universal joint instead of a ball joint 23. Also, the support arm 22 may be configured to change its length by extending or retracting.

[0040] [Another embodiment] Another embodiment of the present invention will be described. Furthermore, the configurations of each of the separate embodiments described below are not limited to being applied individually, but can also be applied in combination with the above-described embodiments or other separate embodiments.

[0041] (1) In the above embodiment, the spark catcher 10 is shown as being foldable in half at the bisecting position of the support frame 11, but it is not limited to this, and for example, it may be foldable in half at a position other than the bisecting position of the support frame 11.

[0042] (2) The spark catcher 10 may be, for example, one that has a handle on the support frame 11 for use when it is folded in half and carried.

[0043] (3) In the above embodiment, a single bag-shaped flame-retardant sheet 12 was exemplified as the spark catcher, but it is not limited to this, and may consist of two parts, for example, a sheet metal slag catcher tray supported on the horizontal frame portion 13A of the support frame 11 and a flame-retardant sheet supported on the upright frame portion 13B of the support frame 11. With this configuration, the durability of the spark catcher 10 can be improved by providing a sheet metal slag catcher tray with excellent fire resistance on the horizontal frame portion 13A side of the spark catcher 10, where the amount of molten slag and the like that is received is large. Furthermore, in this configuration, it is preferable to make it easy to replace the slag receiving tray if it is damaged by attaching the sheet metal slag receiving tray to the horizontal frame portion 13A of the support frame 11, for example, by screwing it in. It is also preferable to make it easy to replace the flame-retardant sheet if it is damaged by having the open end of the flame-retardant sheet wrapped around and fixed to the upright frame portion 13B of the support frame 11, for example. Furthermore, in this configuration, for example, the second bar member 16 described above may also be provided on the connection end side of the horizontal frame portion 13A of the support frame 11 with the upright frame portion 13B, thereby changing the shape of the horizontal frame portion 13A from U-shape to rectangular. This will allow the horizontal frame portion 13A to support the slag receiving tray more stably, and will also allow the opening end of the flame-retardant sheet to be wrapped and secured to the upright frame portion 13B side of the support frame 11 more effectively. Furthermore, the slag receiving tray may be formed such that its depth increases towards the front of the tray (the cutting side) so that molten slag and other materials accumulate at the front of the tray.

[0044] (4) In the above embodiment, the fixing means 19 is shown to be provided as the first magnet 19A on the tip of the horizontal frame portion 13A of the support frame 11 opposite to the end that connects to the upright frame portion 13B. However, the arrangement and number of first magnets 19A on the horizontal frame portion 13A can be changed in various ways. For example, the first magnets 19A may be provided on both the aforementioned connecting end and the tip of the horizontal frame portion 13A, or they may be provided in the intermediate portion between the aforementioned connecting end and tip. Furthermore, the fixing means 19 may be configured such that, for example, a guide rail is provided in a horizontal position along the first bar member 15 on the steel column 1 side of the horizontal frame portion 13A of the support frame 11, and a pair of first magnets 19A are supported by this guide rail so as to be able to adjust their position horizontally along the first bar member 15, thereby allowing the horizontal position of each first magnet 19A to be changed according to the column width of the steel column 1.

[0045] (5) In the above embodiment, the second magnet 19B is shown as being attached to the extended end of the arm member 18 via the attitude adjustment part 21 so as to be able to adjust its attitude, but it is not limited to this, and for example, it may be attached to the extended end of the arm member 18 via the position adjustment part so as to be able to adjust its position in a direction intersecting the arm member 18. Furthermore, the position adjustment section could be configured, for example, by forming multiple connecting holes in the support arm 22 on the side of the second magnet 19B in the attitude adjustment section 21, which allows the connection position with the ball joint 23 on the arm member 18 side to be changed in its extending direction, or by forming an elongated hole along the extending direction of the support arm 22 instead of the multiple connecting holes. [Explanation of symbols]

[0046] 1. Steel column 1A Working surface 1B Back 2-piece component 10 Spark catcher 11 Support Frames 11A aperture 12. Flame-retardant sheet (spark catcher) 13 Frame members 13A Horizontal frame section 13B Standing frame section 18 Arm member 19 Fixing means 19A First Magnet 19B Second Magnet 21 Posture adjustment section

Claims

1. A spark catcher that catches sparks generated during the cutting of piece members welded to steel columns, It is constructed in a foldable manner from a support frame formed by foldably connecting both ends of a pair of frame members that form an opening, and a spark catcher supported by the support frame when the support frame is in the state of an opening. In a usage configuration in which the support frame is bent into a substantially L-shape, with one of the pair of frame members being a horizontal frame portion and the other being an upright frame portion, and the support frame and the spark receiver are positioned below and behind the piece member present on the work surface of the steel column, the support frame is provided with an arm member extending from the upper end of the upright frame portion toward the steel column, and a magnetic fixing means that is detachably fixed to the steel column. The fixing means, in the state of use, includes a first magnet provided on the horizontal frame portion that attracts and attaches the horizontal frame portion to the work surface of the steel column, and a second magnet provided on the extended end of the arm member that attracts and attaches the extended end to the back surface of the steel column that extends in a direction perpendicular to the work surface behind the piece member of the work surface, thereby fixing the support frame and the spark catcher to the steel column in a state of openness on the front side of the piece member of the work surface on the steel column.

2. The spark catcher according to claim 1, wherein the first magnet is provided at the end of the horizontal frame portion opposite to the end portion connected to the upright frame portion.

3. The spark catcher according to claim 1 or 2, wherein the second magnet is attached to the extended end of the arm member via a posture adjustment part so as to be able to adjust its posture.

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