Sheet position retaining device

Abstract

To provide a sheet position retaining device which can retain a sheet at a preferable position without needing an assistant and can be easily installed at a work site.SOLUTION: A sheet position retaining device 1 includes: a lower frame 10; a center frame 20 erected from the lower frame; a hook member 40 which is attached at a root part side to an upper bar 26 forming an upper part of the center frame and has, at a tip side, a hook part 45 capable of hooking on a handrail 80 of a scaffold 70; and an upper frame 30 extending upward from the upper bar 26 and inclining to the side opposite to the side where the hook member hooking on the handrail of the scaffold is located. A spatter sheet 90 is attached to the sheet position retaining device 1 to cause the device to retain a position of the sheet. The hook member 40 may rotate around an axis of the upper bar 26.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a sheet posture holding device that holds the posture of a sheet, such as a spark-proof sheet, by attaching the sheet.

Background Art

[0002] For example, when a part of existing equipment such as a scaffold installed inside or outside a steel mill factory (for example, a handrail) is corroded, it is necessary to repair the corroded part. In the repair, the corroded part is cut using a grinder, a plasma cutter, etc., and a new member is joined by fusion welding such as arc welding. Sparks scatter during such cutting and welding operations. Therefore, in order to prevent a fire or the like from occurring due to the scattered sparks, it is necessary to install a spark-proof sheet (spatter sheet) to receive the sparks.

[0003] In a conventional work site, during work such as welding, an assistant other than the worker holds the spark-proof sheet near the worker and holds its posture to prevent the sparks from falling, etc. Specifically, for example, as shown in FIG. 16, the assistant PB stands side by side with the worker PA on the work floor 720 inside the handrail 800 (on the passage side), holds the upper part of the spark-proof sheet 900, and hangs it outside the handrail 800 (on the side opposite to the passage) so as to surround the welding target location or the like to perform spark-proofing. Alternatively, as shown in FIG. 17, the assistant PB uses an aerial work vehicle HV or a temporarily installed scaffold for the assistant separate from the scaffold where the worker stands, stands facing the worker PA with the handrail 800 in between, holds the upper part of the spark-proof sheet 900, and hangs it from the outside of the handrail 800 so as to surround the welding target location or the like to perform spark-proofing.

[0004] In these spark protection methods, in both cases, an assistant is required to hold the position of the spark protection sheet. Therefore, it is impossible for a single operator to complete operations such as welding. Also, the assistant has to keep both hands raised to hold the position of the spark protection sheet until the work is completed, and will get tired if the working hours are long. Further, in the method shown in Fig. 16, since the assistant stands side by side with the operator, the assistant occupies the working space for operations such as welding, which may deteriorate the workability of operations such as welding. Also, in the method shown in Fig. 17, costs for using an aerial work platform or a temporary scaffold are required, resulting in high equipment repair costs.

[0005] By the way, conventionally, as a spark protection device generated by welding or the like, the one shown in Patent Document 1 below is known. In the protection device described in Patent Document 1 below, in a state where the spark receiving part including a refractory sheet is opened in an umbrella shape, the hook part provided at the end of the rod-shaped main body part connected to the spark receiving part can be hooked on the pipe itself to be welded and suspended. According to the protection device described in this document, it is possible to install a refractory sheet below the pipe with a welding point, and it is said that it is possible to reliably receive welding sparks.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, the fireproofing device described in Patent Document 1 installs a fireproof sheet almost directly below the welding location, at a position lower than the height where the operator stands. Therefore, at a work site where strong winds are blowing, the welding sparks may be blown away before landing on the fireproof sheet, and it may not be possible to suitably receive the welding sparks with the fireproof sheet. Also, if there is not enough space to place a fireproof sheet (spark receiving part) below the welding location, the fireproofing device cannot be installed. Thus, the fireproofing device described in Patent Document 1 may be installed in an environment exposed to wind, or it is difficult to attach it to existing facilities such as scaffolds where floor materials for the operator to walk on are arranged.

[0008] The present invention has been made in view of the above circumstances. That is, the problem to be solved is to provide a sheet posture holding device that can hold a sheet such as a spark fireproofing sheet in a posture suitable for receiving sparks without requiring an assistant and can be easily installed at a work site such as welding.

Means for Solving the Problem

[0009] One aspect of the sheet posture holding device made to solve the above problem is a sheet posture holding device that includes a lower frame on which it is placed, a central frame erected from the lower frame, a latching member having a base portion side attached to an upper bar constituting the upper part of the central frame and a latching portion at the tip end side opposite to the base portion that can be latched to a handrail of existing facilities, and an upper frame extending upward from the upper bar and inclined to the side opposite to the side where the latching member latched to the handrail of the existing facilities is located, and a sheet is attached along the upper frame and the central frame to hold the posture of the sheet, wherein the latching member is rotatably attached around the axis of the upper bar.

[0010] According to the seat posture holding device of this aspect, by hooking the hooking portion of the hooking member on the handrail of the existing equipment and placing the lower frame, the seat posture holding device can be attached to the existing equipment without requiring an installation space below the existing equipment. Then, a seat such as a spark protection sheet is attached to the upper frame, and while keeping it in a stretched state, it is lowered along the shapes of the upper frame and the central frame to the placement surface of the lower frame. As a result, it becomes possible to hold the seat in an upright posture that is easy to receive sparks near the existing equipment. Therefore, even without an assistant to hold the seat in an upright posture, only the operator performing operations such as welding can safely perform operations such as welding with the seat such as a spark protection sheet properly installed.

[0011] Furthermore, in the seat posture holding device of this aspect, the hooking member is rotatable around the axis of the upper bar. Therefore, compared with a configuration in which the hooking member is fixedly non-rotatable to the upper bar, the ease of installation of the device can be improved because the hooking member can be rotated after the device is placed and hooked to the existing equipment. Also, since the height of the hooking portion can be changed by rotating the hooking member, the device can be suitably attached to any of a plurality of existing equipments with slightly different heights of the hooked portions.

[0012] In the seat posture holding device of the above aspect, it is desirable that the hooking member is attached movably in the axial direction of the upper bar.

[0013] According to the seat posture holding device of this aspect, since the hooking member can be moved in the axial direction of the upper bar, even if the hooking member interferes with the existing equipment when hooking the hooking member on the handrail of the existing equipment, it is possible to avoid interference only by moving the hooking member without shifting the device itself.

[0014] Furthermore, in the seat posture holding device of the above aspect, it is desirable to provide a plurality of the hooking members, and each of the plurality of hooking members is configured to be able to change the length from the base portion to the hooking portion.

[0015] According to the seat posture holding device of this aspect, even when the height of the handrail for latching one latching member is different from the height of the handrail for latching the other latching member (when the seat posture holding device is attached to existing equipment with a non-constant handrail height), by changing the length from the base portion to the latching portion in one latching member, both latching members can be suitably latched at a length that matches the height of the handrail of the existing equipment.

[0016] Further, in the seat posture holding device of the above aspect, the lower frame has a first lower bar where the central frame extends, and a second lower bar that is located closer to the existing equipment than the first lower bar when the latching member is latched to the handrail of the existing equipment, and it is desirable that the first lower bar and the second lower bar are connected with a certain distance therebetween.

[0017] According to the seat posture holding device of this aspect, the central frame erected from the first lower bar can be separated from the existing equipment by the separation distance between the first lower bar and the second lower bar that constitute the lower frame, and the device can be installed. Thereby, a working space (a space for inserting tools, the hands of workers, etc., or a space for a worker to lean out of the handrail) can be secured between the device and the existing equipment, and a seat such as a spark-proofing seat can be held in an upright posture.

Advantages of the Invention

[0018] According to the technology disclosed in this specification, a seat posture holding device is provided that can hold the seat in a suitable posture without requiring an assistant and can be easily installed at the work site.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Embodiments for Carrying Out the Invention

[0020] 1. First Embodiment Hereinafter, the seat posture holding device 1 according to the first embodiment of the present invention will be described with reference to the drawings. In the following description, the vertical direction and the horizontal direction of each part of the seat posture holding device 1 are described as being the same as the vertical direction and the horizontal direction as viewed by a person facing the seat posture holding device 1. Also, the front direction of the seat posture holding device 1 is described as the direction approaching the person facing the seat posture holding device 1, and the rear direction of the seat posture holding device 1 is described as the direction away from the person facing the seat posture holding device 1.

[0021] FIG. 1 is a perspective view of the seat posture holding device 1 as viewed obliquely from above to the right, FIG. 2 is a front view of the seat posture holding device 1, FIG. 3 is a right side view of the seat posture holding device 1, FIG. 4 is a plan view of the seat posture holding device 1, and FIG. 5 is a perspective view of the vicinity of the latching member 40 provided in the seat posture holding device 1. As shown in FIGS. 1 to 4, the seat posture holding device 1 includes a lower frame 10, a central frame 20, an upper frame 30, and two latching members 40, 40.

[0022] The lower frame 10 is a frame having a rectangular shape in plan view with the longitudinal direction being the left - right direction, and is composed of four members constituting the four sides of the frame. As members constituting two sides along the longitudinal direction (left - right direction), the lower frame 10 includes a first lower bar 12 arranged at the rear and a second lower bar 14 arranged in front in parallel with the first lower bar 12. Also, as members constituting two sides along the short - hand direction (front - rear direction), the lower frame 10 includes a left connecting bar 16 arranged on the left and a right connecting bar 18 arranged on the right in parallel with the left connecting bar 16.

[0023] The first lower bar 12, the left connecting bar 16, and the right connecting bar 18 are made of reinforcing bars and are substantially cylindrical bar-shaped members with a diameter of about 10 mm. The second lower bar 14 is a thin plate-shaped flat steel with a width (length in the front-rear direction) of about 25 mm and a thickness (length in the up-down direction) of about 3 mm. The left end of the first lower bar 12 is joined to the upper end portion 16a of the left connecting bar 16, and the right end of the first lower bar 12 is joined to the upper end portion 18a of the right connecting bar 18. Also, the lower surface side of the left end portion 14a of the second lower bar 14 is joined to the upper surface side of the front end portion 16b of the left connecting bar 16, and the lower surface side of the right end portion 14b of the second lower bar 14 is joined to the upper surface side of the front end portion 18b of the right connecting bar 18. In this way, the lower frame 10 having four sides is formed.

[0024] Note that the width dimension W (see FIG. 2) of the lower frame 10 in the left-right direction is about 1000 mm, and the depth dimension D (see FIG. 3) in the front-rear direction is about 300 mm. Also, the first lower bar 12 and the second lower bar 14 are joined so as to be orthogonal to the left connecting bar 16 and the right connecting bar 18.

[0025] The central frame 20 is a frame having a substantially U-shape (a shape obtained by removing the lower side from a rectangular shape having four sides) with the lower side open when viewed from the front, and is composed of three members forming the U-shape. The central frame 20 includes a pair of standing bars 22 arranged along the up-down direction and facing each other, and an upper bar 26 arranged along the left-right direction. The standing bars 22 include a left standing bar 23 arranged on the left and a right standing bar 24 arranged on the right.

[0026] The upper bar 26, the left standing bar 23, and the right standing bar 24 are made of steel bars and are members in the shape of a substantially cylindrical rod with a diameter of about 10 mm. The left end of the upper bar 26 is joined to the upper end portion 23a of the left standing bar 23, and the right end of the upper bar 26 is joined to the upper end portion 24a of the right standing bar 24. Further, the lower end portion 23b of the left standing bar 23 is joined to the left rear corner portion of the lower frame 10 (referred to as the left rear corner portion 10a), and the lower end portion 24b of the right standing bar 24 is joined to the right rear corner portion of the lower frame 10 (referred to as the right rear corner portion 10b). The left standing bar 23 is vertically erected from the left rear corner portion 10a of the lower frame 10, and the right standing bar 24 is vertically erected from the right rear corner portion 10b of the lower frame 10. That is, the central frame 20 is vertically erected along the vertical direction from the left end portion and the right end portion of the first lower bar 12 in the lower frame 10.

[0027] Incidentally, the width dimension in the left - right direction of the central frame 20 is about 1000 mm, which is the same as the width dimension W (see Figure 2) in the left - right direction of the lower frame 10, and the height dimension H1 (see Figure 3) in the up - down direction of the central frame 20 is about 900 mm.

[0028] The upper frame 30 is a frame in a substantially U - shaped (a shape obtained by removing the lower side from a quadrilateral shape with four sides) when viewed in plan, and is composed of three members forming the U - shape. The upper frame 30 is inclined backward upward so that the upper part 30b is located rearward compared to the lower part 30a side (see Figure 3). The upper frame 30 has, as three members forming the U - shape, a left inclined bar 33 arranged on the left side, a right inclined bar 34 arranged on the right side, and a topmost bar 36 arranged on the upper side.

[0029] The left inclined bar 33 and the right inclined bar 34 are substantially cylindrical bar-shaped members with a diameter of about 10 mm. The top bar 36 is a thin plate-shaped flat steel with a width of about 25 mm and a thickness of about 3 mm. The rear side of the left end 36a of the top bar 36 is joined to the front side of the upper end 33a of the left inclined bar 33, and the rear side of the right end 36b of the top bar 36 is joined to the front side of the upper end 34a of the right inclined bar 34. Also, the lower end 33b of the left inclined bar 33 is joined to the upper left corner of the central frame 20 (referred to as the upper left corner 20a), and the lower end 34b of the right inclined bar 34 is joined to the upper right corner of the central frame 20 (referred to as the upper right corner 20b). The left inclined bar 33 extends from the upper left corner 20a of the central frame 20 at an inclination angle of about 45 degrees with respect to the virtual vertical plane, and the right inclined bar 34 extends from the upper right corner 20b of the central frame 20 at an inclination angle of about 45 degrees with respect to the virtual vertical plane. That is, the upper frame 30 is joined to the left end and the right end of the upper bar 26 of the central frame 20 in a posture tilted backward so that the inclination angle θ (see Fig. 3) with respect to the virtual vertical plane is about 45 degrees.

[0030] Note that the lateral width dimension of the upper frame 30 is about the same 1000 mm as the lateral width dimension W (see Fig. 2) of the lower frame 10 and the central frame 20, and the vertical height dimension H2 (see Fig. 3) from the lower frame 10 to the top bar 36 of the upper frame 30 is about 1330 mm. Also, the joining of each member constituting the lower frame 10, the central frame 20, and the upper frame 30 in the seat posture holding device 1 is fusion welding.

[0031] Also, since the lower frame 10, the central frame 20, and the upper frame 30 in the seat posture holding device 1 are mainly composed of cylindrical reinforcing bars with a diameter of about 10 mm, they can be slightly bent in the front-rear, left-right, and up-down directions. Therefore, compared with the case where the specification is such that it cannot be bent at all, the operation of attaching the seat posture holding device 1 to a scaffold handrail or the like has become easier.

[0032] The two latching members 40, 40 are attached to the upper bar 26 of the central frame 20. Specifically, each latching member 40 includes a cylindrical sleeve portion 42 and a substantially J-shaped main body portion 44 which is a J shape reversed left and right in a right side view and is fusion-bonded to the outer peripheral surface of the sleeve portion 42. The main body portion 44 is made of the same reinforcing bar as the upper bar 26 and the like. The inner diameter of the cylindrical hole 42a (see FIG. 5) of the sleeve portion 42 is larger than the diameter of the upper bar 26 of the central frame 20. By inserting the upper bar 26 of the central frame 20 into the cylindrical hole 42a of the sleeve portion 42, the latching member 40 is attached to the upper bar 26 so as to be rotatable about a rotation axis AD (see FIG. 1) along the axial direction of the upper bar 26 and slidable (movable in the left-right direction) along the axial direction of the upper bar 26. The latching member 40 arranged on the left side of the upper bar 26 is referred to as a left latching member 40L, and the latching member 40 arranged on the right side of the upper bar 26 is referred to as a right latching member 40R. The left latching member 40L and the right latching member 40R have the same configuration.

[0033] The tip end portion 40a side of the latching member 40, which is opposite to the base portion 40b side where the sleeve portion 42 is located, is bent into a substantially J shape which is a J shape reversed left and right in a right side view. The tip end portion 40a (tip end portion 44a of the main body portion 44) of the latching member 40 bent into a substantially J shape serves as a latching portion 45 that can be hooked onto a handrail of an existing facility such as a scaffold from above. That is, the latching member 40 is a member having a substantially J shape in a right side view with the tip end portion 40a serving as the latching portion 45 and the base portion 40b opposite to the tip end portion 40a serving as the attachment portion to the upper bar 26. The length L (see FIG. 3) from the base end to the tip end of the latching member 40 is about 450 mm.

[0034] Next, the usage method of the seat posture holding device 1 will be described. FIG. 6 shows a state in which the seat posture holding device 1 is attached to a scaffold 70 installed in a factory built in a steelworks, for example. FIG. 7 shows a state in which a spark-proof curing sheet 90 is attached to the seat posture holding device 1 attached to the scaffold 70.

[0035] As shown in FIG. 6, the scaffold 70 includes a floor material (working floor) 72 that forms a walkway for workers and the like to walk on, and a handrail device 74 disposed at an end in the short direction (passage width direction) of the walkway. The handrail device 74 is provided over substantially the entire length in the longitudinal direction (direction along the passage) of the walkway. The handrail device 74 includes a base portion 76 made of H-shaped steel or the like, a plurality of building sites (handrail columns) 78 welded to the upper surface side of the base portion 76 and extending along the vertical direction, a handrail 80 welded to the upper part of each building site 78 and extending along the walkway, and upper and lower two-stage intermediate crossbars 84 that connect adjacent ones of the plurality of building sites 78 arranged at predetermined intervals along the walkway below the handrail 80. Although not shown, the handrail device 74 is provided at both ends in the width direction of the floor material 72. Further, the base portion 76 constitutes a floor beam that supports the floor material 72. The handrail 80 is a thin-walled hollow pipe member, and its thickness is about 4 cm in diameter. In the handrail device 74 of this embodiment, the length from the upper surface of the base portion 76 to the upper end of the handrail 80 (height of the handrail 80) is about 1100 mm.

[0036] When corrosion occurs in the handrail 80 or the like of such a scaffold 70, the corroded part is cut off and removed using a grinder or the like, and a new pipe member is joined to that part by welding. It is necessary to perform spark protection during this repair work. For this reason, the operator attaches the seat posture holding device 1 of this embodiment to the scaffold 70. Specifically, the operator lifts the seat posture holding device 1 and turns it from above the handrail device 74 to the outside of the handrail device 74 (the side opposite to the floor material 72 when viewed from the handrail device 74).

[0037] Then, the front end portion 10f of the lower frame 10 of the seat posture holding device 1 is placed on the base portion 76, and the left latching member 40L and the right latching member 40R are rotated about the axial direction of the upper bar 26 as the rotation center, and the respective latching portions 45, 45 are hooked onto the handrail 80 from above the handrail 80. Thereby, the seat posture holding device 1 can be attached to the scaffold 70 in the posture shown in FIG. 6. As shown in FIG. 6, in this embodiment, the seat posture holding device 1 is attached to the scaffold 70 such that the lower frame 10 is substantially parallel to the upper surface of the base portion 76, and the left standing bar 23 and the right standing bar 24 are substantially parallel to the building site 78. Further, in a state where the seat posture holding device 1 is attached to the scaffold 70, the upper bar 26 is located at a position lower than the handrail 80, and the uppermost bar 36 is located at a position higher than the handrail 80.

[0038] In addition, since the scaffold 70 may be installed at a high place such as 30 m or 40 m from the ground, as shown by the two-dot chain line in FIG. 6, a part of the seat posture holding device 1 (for example, the upper bar 26) and a part of the scaffold 70 (for example, the handrail 80) may be connected by a metal chain 88 to prevent a possible fall. The weight of the seat posture holding device 1 is about 5 kg, and even a single operator can sufficiently perform the attachment work to the scaffold 70.

[0039] After attaching the seat posture holding device 1 to the scaffold 70 as shown in FIG. 6, the operator attaches a spark protection sheet (spatter sheet) 90 to the seat posture holding device 1 as shown in FIG. 7. As the spark protection sheet 90, a known one such as a sheet in which both sides of a base cloth made of flame-resistant fiber are coated with a special silicon having high heat resistance can be used. Further, as the spark protection sheet 90, for example, a sheet having a width in the left-right direction and a length in the up-down direction of about 2000 mm and a thickness of about 1 mm can be preferably used.

[0040] FIG. 7 shows a state where the spark hardening sheet 90 is attached inside the seat posture holding device 1 (the side where the handrail device 74 is located). When attaching the spark hardening sheet 90 inside the seat posture holding device 1, as shown in FIG. 7, the operator sandwiches and fastens approximately two locations at the upper end 90a of the spark hardening sheet 90 with clips 98, 98 made of, for example, stainless steel, to the left end and the right end of the uppermost bar 36 of the upper frame 30 of the seat posture holding device 1. Then, while placing the spark hardening sheet 90 on the left inclined bar 33, the right inclined bar 34 of the upper frame 30, and the upper bar 26 of the central frame 20, it is hung down to the lower frame 10. The lower part 90b of the spark hardening sheet 90 is placed on the lower frame 10 so as to be as horizontal as possible from the first lower bar 12 to the second lower bar 14 of the lower frame 10, and is pulled out toward the base part 76 and the floor material 72.

[0041] Also, the left end 90c of the spark hardening sheet 90 is hung down toward the left connecting bar 16 of the lower frame 10 while hooking the upper part onto the left latching member 40L from above and fastening it with a clip 98. Also, the right end 90d of the spark hardening sheet 90 is hung down toward the right connecting bar 18 of the lower frame 10 while hooking the upper part onto the right latching member 40R from above and fastening it with a clip 98.

[0042] By attaching the spark hardening sheet 90 to the seat posture holding device 1 in this way, the spark hardening sheet 90 is held in a substantially box-shaped posture with the handrail device 74 side and the upper side open. Specifically, the spark hardening sheet 90 has an upper inclined surface portion 91 substantially along a rectangular virtual surface surrounded by the upper frame 30 and the upper bar 26, a central vertical surface portion 92 substantially along a rectangular virtual surface surrounded by the central frame 20 and the first lower bar 12, a lower horizontal surface portion 93 substantially along a rectangular virtual surface surrounded by the lower frame 10, a left vertical surface portion 94 substantially along a virtual vertical plane from the left latching member 40L to the left connecting bar 16, and a right vertical surface portion 95 substantially along a virtual vertical plane from the right latching member 40R to the right connecting bar 18, and is held in the formed posture.

[0043] Note that, as shown in Fig. 7, if the upper left end 90cu and the upper right end 90du of the spark protection sheet 90 are arranged to hang on the handrail 80, the surfaces for receiving the sparks at the upper part of the left end portion 90c and the upper part of the right end portion 90d of the spark protection sheet 90 can be held upward. Therefore, it is possible to receive the sparks even at these portions, which is preferable.

[0044] Fig. 8 is a view showing the state of the repair work after the spark protection sheet 90 is attached to the scaffold posture holding device 1 attached to the scaffold 70 as shown in Fig. 7. In the situation shown in Fig. 8, the cutting of the corroded portion of the handrail 80 is completed, and the operator P is welding a new pipe member 100 to the handrail 80. As shown in Fig. 8, during welding, sparks (welding sparks) F scatter from the welding location WD. By attaching the scaffold 70 to the scaffold posture holding device 1 and attaching the spark protection sheet 90 to the scaffold posture holding device 1 as described above so that the welding location WD comes to the front of the spark protection sheet 90 (in front of the center in the left-right direction), the welding location WD is surrounded by the lower horizontal surface portion 93 and the three vertical surface portions (the central vertical surface portion 92, the left vertical surface portion 94, and the right vertical surface portion 95) of the spark protection sheet 90, and the sparks F can be received inside the enclosure formed by the spark protection sheet 90. Also, the sparks F scattered above this enclosure can be received by the upper inclined surface portion 91. In this way, it is possible to prevent the sparks F from scattering and falling outside the handrail device 74 on the scaffold 70 (on the side opposite to the corridor). That is, by using the scaffold posture holding device 1 of this embodiment, it is possible for only one operator P to suitably perform spark protection while completing the repair work without requiring an assistant to hold the spark protection sheet 90 and maintain its posture. Note that although the welding work is illustrated in Fig. 8, the scaffold posture holding device 1 can also be suitably used for spark protection during cutting.

[0045] As described in detail above, the sheet posture holding device 1 of the present embodiment includes a lower frame 10, a central frame 20 erected from the lower frame 10, and a hooking member 40 attached to the base portion 40b side of the upper bar 26 that constitutes the upper part of the central frame 20, and a hooking portion 45 that can be hooked on the handrail 80 of the scaffold 70 (an example of existing equipment) on the tip portion 40a side opposite to the base portion 40b. The upper frame 30 extends upward from the upper bar 26 and is inclined toward the side (rear side) opposite to the side where the hooking member 40 hooked on the handrail 80 of the scaffold 70 is located. This sheet posture holding device 1 holds the posture of the spark curing sheet 90 (an example of a sheet) by attaching the spark curing sheet 90 along the upper frame 30 and the central frame 20. The hooking member 40 is rotatably attached around the axis of the upper bar 26.

[0046] According to the sheet posture holding device 1 of the present embodiment, by placing the lower frame 10 on the base portion 76 of the scaffold 70 and hooking the hooking portion 45 of the hooking member 40 on the handrail 80 of the scaffold 70, the sheet posture holding device 1 can be attached at the same height as the handrail device 74 of the scaffold 70 without requiring an installation space below the scaffold 70 (see FIG. 6). Then, the spark curing sheet 90 is attached to the upper frame 30 and is lowered while being kept in a stretched state along the shapes of the upper frame 30 and the central frame 20 to the placement surface of the lower frame 10 (the upper surface of the base portion 76) (see FIG. 7). Note that the lower portion 90b of the spark curing sheet 90 is laid toward the base portion 76 and the floor material 72. Thereby, it becomes possible to hold the spark curing sheet 90 in an upright posture (a desired posture suitable for spark curing) that is easy to receive the spark F near the handrail 80 of the scaffold 70. Therefore, even without an assistant to hold the spark curing sheet 90 in an upright posture, as shown in FIG. 8, only the operator P who performs operations such as welding can safely perform operations such as welding with the spark curing sheet 90 properly installed.

[0047] In particular, by using the sheet posture holding device 1 of this embodiment, not only can the sparks F falling below the welding point WD be received by the lower horizontal surface portion 93 of the spark-proof sheet 90, but as shown in FIG. 8, the sparks F can be received before falling at the same height as the welding point WD by the three vertical surface portions (the central vertical surface portion 92, the left vertical surface portion 94, and the right vertical surface portion 95), or the sparks F scattered above the welding point WD can be received by the upper inclined surface portion 91. Therefore, even in a repair operation in an environment where a strong wind is blowing, it is possible to surely receive the sparks F generated by welding or the like without allowing the spark-proof sheet 90 to receive them.

[0048] Further, in the sheet posture holding device 1 of this embodiment, the latching member 40 is rotatable about the axis of the upper bar 26 (that is, rotatable about the rotation axis AD along the axial direction of the upper bar 26) (see FIG. 1). Therefore, compared with a configuration in which the latching member 40 is fixedly and non-rotatably attached to the upper bar 26, the ease of installation of the sheet posture holding device 1 can be improved by the amount that the latching member 40 can be rotated after the sheet posture holding device 1 is placed and then latched to the scaffold 70.

[0049] In addition, since the height of the latching portion 45 can be changed by rotating the latching member 40, the seat posture holding device 1 can be suitably attached to any of a plurality of scaffolds (existing facilities) having slightly different heights of the handrail (the portion to be latched). Specifically, the seat posture holding device 1 can be attached to the handrail device 74 having a handrail 80 at the first height TH1 from the base portion 76 as shown in FIG. 9(A), and also to the handrail device 740 having a handrail 80 at the second height TH2 higher than the first height TH1 from the base portion 76 as shown in FIG. 9(B). In the handrail device 74 shown in FIG. 9(A) and the handrail device 740 shown in FIG. 9(B), the vertical lengths of the building lots (building lots 78 and 780) are different. When the seat posture holding device 1 is attached to the handrail device 74 shown in FIG. 9(A), the front end 10fa of the lower frame 10 is separated from the building lot 78. On the other hand, when the seat posture holding device 1 is attached to the handrail device 740 shown in FIG. 9(B), the front end 10fa of the lower frame 10 is in contact with the building lot 780 without a gap. In the case shown in FIG. 9(B), compared with the case shown in FIG. 9(A), the frames (lower frame 10, central frame 20, upper frame 30) of the seat posture holding device 1 are brought closer to the handrail device 740 side, and by rotating the latching member 40 clockwise in a right side view, the height of the latching portion 45 (the tip portion 44a of the latching member 40) can be increased. Thereby, even if there is a handrail 80 at the second height TH2 (a height higher than the first height TH1), it is possible to suitably attach the seat posture holding device 1.

[0050] In the sheet posture holding device 1 of this embodiment, the latching member 40 is attached so as to be movable in the axial direction of the upper bar 26 (see FIG. 1). Therefore, even when the latching member 40 is likely to interfere with the building ground 78 of the scaffold 70 when the latching member 40 is latched to the handrail 80 of the scaffold 70, it is possible to avoid interference only by moving the latching member 40 without shifting the sheet posture holding device 1 itself. Specifically, as shown in FIG. 10, after placing the sheet posture holding device 1 on the base portion 76 of the handrail device 74, while moving the left latching member 40L from the left end of the upper bar 26 to the right to avoid interference with the left building ground 78, it is latched to the handrail 80, and while moving the right latching member 40R from the right end of the upper bar 26 to the left to avoid interference with the right building ground 78, it is latched to the handrail 80. Thus, the latching member 40 can be suitably latched to the handrail 80 while avoiding interference with the building ground 78.

[0051] In the sheet posture holding device 1 of this embodiment, the lower frame 10 has a first lower bar 12 on which the central frame 20 extends, and a second lower bar 14 that is located closer to the scaffold 70 than the first lower bar 12 when the latching member 40 is latched to the handrail 80 of the scaffold 70. The first lower bar 12 and the second lower bar 14 are separated by a certain distance (about 300 mm in this embodiment) and connected. For this reason, it is possible to install the sheet posture holding device 1 by separating the central frame 20 erected from the first lower bar 12 by the separation distance between the first lower bar 12 and the second lower bar 14 that constitute the lower frame 10 (the distance corresponding to the depth dimension D of the lower frame 10 shown in FIG. 3) from the scaffold 70 (see FIG. 6). Thereby, it is possible to hold the spark protection sheet 90 in an upright posture while securing a work space (a space for inserting tools, the hands of workers, etc., or a space for a worker to lean out of the handrail 80) between the sheet posture holding device 1 and the scaffold 70.

[0052] That is, according to this embodiment, as shown in FIG. 11, since the space S (the hatched portion in the figure) secured between the seat posture holding device 1 and the handrail device 74 can be used as a work space, tools such as a clamp holding a welding rod, a welding torch, and a grinder, and the hands of the operator can be inserted outside the handrail device 74 (on the side opposite to the corridor), and the workability of repair is good. Further, since the upper frame 30 is inclined rearward (outside the handrail device 74), it is easier for the operator to perform repair work by putting out the head, shoulders, arms, etc. from above the handrail 80 to the outside. Compared with the configuration in which the upper frame extends from the central frame along the vertical direction, the workability of repair is good. This is the same when repairing the intermediate rail 84 in the handrail device 74 or repairing the building site 78.

[0053] 2. Second Embodiment Next, the seat posture holding device 1B of the second embodiment will be described with reference to FIGS. 12 and 13. In the description of the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. The seat posture holding device 1B of the second embodiment includes the latching members 400, 400 shown in FIG. 12, and the configuration of the latching members 400, 400 is different from that of the latching members 40, 40 according to the first embodiment.

[0054] The latching member 400 according to the second embodiment is configured such that the length from the base end to the tip (from the base portion 400b to the tip portion 400a) can be changed. That is, the latching members 400, 400 are configured to be telescopically extendable along the axial direction. The latching member 400 attached to the left side of the upper bar 26 is referred to as the left latching member 400L, and the latching member 400 attached to the right side of the upper bar 26 is referred to as the right latching member 400R.

[0055] Specifically, each latching member 400 (left latching member 400L and right latching member 400R) includes a sleeve portion 42 having a cylindrical hole 42a through which the upper bar 26 is inserted, a hollow first member 440 welded to the outer peripheral surface of the sleeve portion 42, and a second member 480 having a substantially J-shaped side view with the base portion side inserted into the first member 440. The tip portion 480a of the second member 480 (the tip portion 400a of the latching member 400) is a latching portion 450 bent into a substantially J shape so as to be able to be hooked on the handrail 80. Three engaging recesses 490 are provided at predetermined intervals (for example, at intervals of 100 mm) along the axial direction at the base portion 480b of the second member 480. Each engaging recess 490 is a location where the tip portion Ba (the end portion opposite to the head) of the screw B described later abuts.

[0056] The first member 440 is provided with a through hole 442 penetrating in the thickness direction, and a screw portion is formed on the inner peripheral surface of the through hole 442. The screw B is fastened to the through hole 442, and by tightening the screw B so that the tip portion Ba of the screw B hits one of the engaging recesses 490 of the second member 480, the second member 480 is fixed so as not to come off the first member 440. If the screw B is loosened to such an extent that it does not protrude from the inner peripheral surface of the first member 440 and the second member 480 is moved in the direction of insertion into or extraction from the first member 440, the engaging recess 490 receiving the screw B can be changed. If the through hole 442 is aligned with the engaging recess 490 closest to the latching portion 450 (the first engaging recess 491) and the screw B is tightened, the length of the latching member 400 becomes the shortest. If the through hole 442 is aligned with the engaging recess 490 farthest from the latching portion 450 (the third engaging recess 493) and the screw B is tightened, the length of the latching member 400 becomes the longest. If the through hole 442 is aligned with the engaging recess 490 (the second engaging recess 492) between the first engaging recess 491 and the third engaging recess 493 and the screw B is tightened, the length of the latching member 400 becomes medium. Thus, in this embodiment, the length of the latching member 400 can be changed in three stages. As the expansion and contraction mechanism for expanding and contracting the latching member, a known mechanism other than the mechanism of the second embodiment, for example, a telescopic mechanism, can be appropriately adopted.

[0057] Figure 13 shows the state where the seat posture holding device 1B of the second embodiment is attached to the scaffold 70B. In this scaffold 70B, the height of the handrail 80B provided along the corridor (passageway) is changed halfway. Specifically, as shown in Figure 13, the height LH of the left part (left handrail 80BL) of the handrail 80B is higher than the height RH of the right part (right handrail 80BR). For example, the height LH is about 1100 mm and the height RH is about 1000 mm. The left handrail 80BL and the right handrail 80BR are connected by an inclined handrail 80BK that slopes downward from left to right. Thus, the height of the handrail 80B in the scaffold 70B is not constant.

[0058] Since the latching member 400 of the seat posture holding device 1B of the second embodiment can be expanded and contracted, it can be suitably installed even on a handrail 80B with a non-constant height as shown in Figure 13. Specifically, for the left latching member 400L to be latched to the relatively high left handrail 80BL, the through hole 442 of the first member 440 is aligned with the third engaging recess 493 of the second member 480 and the screw B is tightened to adjust the length of the left latching member 400L to the longest. On the other hand, for the right latching member 400R to be latched to the relatively low right handrail 80BR, the through hole 442 of the first member 440 is aligned with the second engaging recess 492 of the second member 480 and the screw B is tightened to adjust the length of the right latching member 400R to a medium level. By adjusting the lengths of the latching members 400, 400 in this way, while placing the lower frame 10 of the seat posture holding device 1B on the base part 76B of the handrail device 74B in the scaffold 70B, it is possible to appropriately hook the left latching member 400L on the left handrail 80BL and the right latching member 400R on the right handrail 80BR. That is, according to the seat posture holding device 1B of the second embodiment, it is possible to suitably attach it even to existing equipment where the height of the latched portions for latching a plurality of latching members (left latching member 400L, right latching member 400R) is different.

[0059] 3. Others Although the sheet posture holding devices of the first and second embodiments have been described above, the present invention is not limited to the above-described embodiments and can be appropriately modified without departing from the gist thereof. Note that the modification examples described below may be configured by appropriately combining them within the technically possible range.

[0060] In each of the above-described embodiments, the upper bar 26 is inserted through the sleeve portion 42 of the latching member (latching member 40, latching member 400), so that the latching member is rotatable about the axis of the upper bar 26 and slidable (movable) in the axial direction of the upper bar 26 (see FIGS. 1 and 12). On the other hand, the latching member (latching member 40, latching member 400) may be configured not to be movable in the axial direction of the upper bar 26. Specifically, for example, rings (such as C-shaped, E-shaped, O-shaped rings, etc.) may be fitted to both the left and right ends of the latching member to restrict axial movement. Further, as in the sheet posture holding device 1C shown in FIG. 14, the upper bar 260 is rotatably supported at the upper ends of the left standing bar 230 and the right standing bar 240, and the base portions 500b, 500b of the latching members 500, 500 having a substantially J-shaped side view are welded to the outer peripheral surfaces of the left and right ends of the upper bar 260. Note that the left end of the upper bar 260 is prevented from coming off the left standing bar 230 using, for example, an O-ring member 270, and the right end of the upper bar 260 is prevented from coming off the right standing bar 240 using, for example, an O-ring member 270. With such a configuration, the latching members 500, 500 hooked on the handrail 80 cannot be slid axially with respect to the upper bar 260, but can be rotated about the axial direction of the upper bar 260 as the rotation center (see the two-dot chain line in FIG. 14). Therefore, the workability of installing the sheet posture holding device 1C is good compared to a configuration in which the latching member cannot be rotated.

[0061] Also, in each of the above-described embodiments, the central frame 20 (the left standing bar 23 and the right standing bar 24) is erected from both left and right ends of the first lower bar 12 located at the rear in the lower frame 10 (see FIG. 1). On the other hand, like the seat posture holding device 1D shown in FIG. 15, the central frame 20 (the left standing bar 23 and the right standing bar 24) may be erected from a position at the center in the front-rear direction of the left connecting bar 16 and a position at the center in the front-rear direction of the right connecting bar 18 in the lower frame 10. When the seat posture holding device 1D having such a configuration is attached to the scaffold 70, the separation distance from the handrail device 74 to the central frame 20 becomes smaller than that in the above embodiment. Therefore, the working space (a space for inserting cutting or welding tools, or the hands, head, shoulders, etc. of an operator) formed between the spark protection sheet 90 attached to the seat posture holding device 1D and the handrail device 74 becomes smaller. However, even with the seat posture holding device 1D having such a configuration, it is possible to hold the posture of the spark protection sheet 90 in a desired posture suitable for spark protection. In order to secure a sufficient working space for repair work, the distance from the front end of the lower frame 10 to the erected position of the central frame 20 is preferably about 200 mm or more (more preferably about 250 mm or more, and even more preferably about 300 mm or more as in the above embodiment). Further, the central frame 20 may be erected from another position (a position other than the center in the front-rear direction) of the left connecting bar 16 and the right connecting bar 18 in the lower frame 10.

[0062] Also, in addition to the modification example shown in FIG. 15, the shape and arrangement of each frame constituting the seat posture holding device can be changed as appropriate. Specifically, for example, the lower frame does not have to have two bars (the first lower bar and the second lower bar) arranged in parallel. Further, the central frame does not have to be erected vertically from the lower frame. Also, the inclination angle θ (see FIG. 3) of the upper frame with respect to the virtual vertical plane can be changed as appropriate. However, the inclination angle θ is preferably within 50 degrees (more preferably within 45 degrees). This is because as the upper frame approaches being horizontal (the more the upper frame is laid down), the height of the upper inclined surface portion 91 becomes lower when the spark protection sheet 90 is attached, making it difficult to receive the sparks F scattered upward.

[0063] Also, in the first embodiment, the spark annealing sheet 90 is attached to the inside of the seat posture holding device 1 (the side where the handrail 80 is located when attached to the scaffold 70) (see FIG. 7), but it may be attached to the outside of the seat posture holding device 1 (the side opposite to the side where the handrail 80 is located when attached to the scaffold 70). In this case, the spark annealing sheet 90 covers (wraps) each frame (upper frame 30, central frame 20, lower frame 10) of the seat posture holding device 1 from the outside. The upper end 90a of the spark annealing sheet 90 is fastened to the uppermost bar 36 with a clip 98, the upper part of the left end 90c of the spark annealing sheet 90 is fastened to the left latching member 40L or the handrail 80 with a clip 98, and the upper part of the right end 90d of the spark annealing sheet 90 is fastened to the right latching member 40R or the handrail 80 with a clip 98. The lower part 90b of the spark annealing sheet 90 may be sandwiched between the lower frame 10 and the base part 76 and pulled out toward the floor material 72.

[0064] Also, in each of the above-described embodiments, the seat posture holding device (seat posture holding device 1, seat posture holding device 1B) has a configuration having two latching members (latching member 40, latching member 400), but it may have only one latching member. Even with such a configuration, it is possible to latch the seat posture holding device to the handrail of existing equipment such as the scaffold 70 with the latching member. In addition, when configured in this way, the spark annealing sheet 90 may be attached to the outside of the seat posture holding device. Also, the seat posture holding device may have a configuration having three or more latching members. Such a configuration is particularly suitable when the lateral width dimension of the seat posture holding device is large.

[0065] Also, in each of the above-described embodiments, the seat posture holding device (seat posture holding device 1, seat posture holding device 1B) has been described as being attached to the scaffold 70 (scaffold installed in facilities such as factories and construction sites). However, the existing equipment to which the seat posture holding device is attached may be other equipment provided with a handrail, such as a balcony of a house (apartment or detached house, etc.). Also, in each of the above-described embodiments, the seat posture holding device (seat posture holding device 1, seat posture holding device 1B) has been described as being attached with a spark-proof sheet 90 for receiving welding sparks, etc. However, the sheet attached to the seat posture holding device may be other sheets, such as a so-called blue sheet (sheet made of synthetic resin such as polyethylene) used for purposes such as receiving dripping paint.

Explanation of Reference Numerals

[0066] 1... Seat posture holding device 10... Lower frame 12... First lower bar 14... Second lower bar 20... Central frame 26... Upper bar 30... Upper frame 40... Hooking member 40a... Tip 40b... Base 45... Hooking part 70... Scaffold (existing equipment) 80... Handrail 90... Spark-proof sheet

Claims

1. A lower frame on which it is placed, A central frame erected from the lower frame, A latching member attached to the base portion side of an upper bar constituting the upper portion of the central frame, and having a latching portion at the tip end side opposite to the base portion that can be latched to a handrail of existing equipment, An upper frame extending upward from the upper bar and inclined toward the side opposite to the side where the latching member latched to the handrail of the existing equipment is located, and comprising: A seat posture holding device that holds the posture of the seat by attaching the seat along the upper frame and the central frame, The seat posture holding device, wherein the latching member is rotatably attached around the axis of the upper bar.

2. The seat posture holding device according to Claim 1, The seat posture holding device, wherein the latching member is movably attached in the axial direction of the upper bar.

3. The seat posture holding device according to Claim 2, The seat posture holding device includes a plurality of the latching members, Each of the plurality of latching members is configured such that the length from the base portion to the latching portion can be changed.

4. The seat posture holding device according to any one of Claims 1 to 3, The lower frame has a first lower bar on which the central frame extends, and a second lower bar located closer to the existing equipment than the first lower bar in a state where the latching member is latched to the handrail of the existing equipment, and the first lower bar and the second lower bar are connected at a certain distance apart.

Images