Anti-falling device for edge operation

Abstract

The utility model belongs to the technical field of edge operation devices, and discloses an edge operation anti-falling device. The edge operation anti-falling device comprises an anti-falling pad, a supporting frame assembly, a fence assembly and a fixing assembly. The supporting frame assembly comprises four L-shaped beams, and the four L-shaped beams are detachably connected end to end in sequence and arranged on the periphery of the anti-falling pad in a surrounding mode. The fence assembly comprises four L-shaped fences, the L-shaped fences correspond to the L-shaped beams in a one-to-one mode, and the four L-shaped fences are vertically arranged on the corresponding L-shaped fences respectively and define an anti-falling area. The fixing assembly is used for fixing the supporting frame assembly to a guardrail or a baffle, the fixing assembly is located on the outer wall of the L-shaped beam close to one side of the guardrail or the baffle, universality is high, dismounting and mounting are easy, and carrying is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to a temporary edge operation device technical field especially relates to a temporary edge operation anti -fall device. BACKGROUND

[0002] Temporary edge is the edge of the periphery of the floor, the side of the stair, the edge of the platform or balcony, the periphery of the roof and the periphery of the ditch, pit, groove, deep foundation in the construction site without enclosure facilities or the height of enclosure facilities is lower than 0.8 meters which endanger the safety of the person. Generally, when the temporary edge high-altitude operation is carried out in the building, the protective fence or the protective plate is used. In the industrial production process, the object to be executed often needs to be outside the protective fence or the protective plate, and the worker needs to hold the tool temporarily. Generally, when the worker works under this kind of working condition, the tool is tied to the wrist with the anti -fall rope to prevent the tool from falling and the foreign matter or the injury. However, the anti -fall rope can only prevent the whole tool from falling, and cannot prevent the small parts on the tool or the small parts on the equipment from falling.

[0003] Therefore, it is urgent to provide a temporary edge operation anti -fall device to solve the above problems. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a temporary edge operation anti -fall device, which is widely applicable, easy to disassemble and assemble and convenient to carry.

[0005] To achieve this purpose, the utility model adopts the following technical scheme:

[0006] The temporary edge operation anti -fall device comprises:

[0007] The anti -fall pad;

[0008] The support frame assembly comprises four L-shaped beams, and the four L-shaped beams are detachably connected in sequence and surround the anti -fall pad;

[0009] The fence assembly comprises four L-shaped fences, the L-shaped fences correspond to the L-shaped beams one by one, and the four L-shaped fences are vertically arranged on the corresponding L-shaped fences and form an anti -fall area;

[0010] The fixing assembly is used for fixing the support frame assembly to the guardrail or the baffle, and the fixing assembly is located on the outer wall of the L-shaped beam close to the guardrail or the baffle.

[0011] As an optional technical scheme of the edge operation falling protection device, the support frame assembly further comprises two groups of straight beams, the two groups of straight beams are located on opposite sides of the falling protection pad respectively, each group of straight beams is located between two adjacent L-shaped beams, and each group of straight beams is detachably connected between two adjacent straight beams and between the straight beam and the L-shaped beam; the enclosing assembly further comprises two groups of straight enclosing parts, the straight enclosing parts correspond to the straight beams one by one, the straight enclosing parts are vertically arranged on the straight beams, and the four L-shaped enclosing parts and the two groups of straight enclosing parts form the falling protection area.

[0012] As an optional technical scheme of the edge operation falling protection device, one group of the straight beams is located on the side close to the guardrail or the baffle, and the other group of the straight beams is located on the side away from the guardrail or the baffle.

[0013] As an optional technical scheme of the edge operation falling protection device, the inner sides of the L-shaped beams and the straight beams are provided with zippers, and the L-shaped beams and the straight beams are detachably connected to the falling protection pad through the zippers.

[0014] As an optional technical scheme of the edge operation falling protection device, the L-shaped beams and the L-shaped enclosing parts are integrally formed; and / or,

[0015] The straight beams and the straight enclosing parts are integrally formed.

[0016] As an optional technical scheme of the edge operation falling protection device, two adjacent L-shaped beams, two adjacent straight beams, and the L-shaped beam and the straight beam adjacent to each other are connected through threads.

[0017] As an optional technical scheme of the edge operation falling protection device, the edge operation falling protection device further comprises a plurality of falling protection rings, the plurality of falling protection rings are respectively located on the L-shaped beams and the straight beams, and a rope is pre-fixed to the guardrail or the baffle through the falling protection rings.

[0018] As an optional technical scheme of the edge operation falling protection device, the number of the fixing assemblies is two, and the two fixing assemblies are respectively located on two L-shaped beams close to the guardrail or the baffle.

[0019] As an optional technical scheme of the edge operation falling protection device, the edge operation falling protection device further comprises a triangular support, one right angle edge of the triangular support abuts against the L-shaped beam, and the other right angle edge of the triangular support abuts against the guardrail or the baffle.

[0020] As an optional technical scheme of the edge operation anti-falling device, the fixing assembly comprises an L-shaped frame and a clamp, the L-shaped frame is capable of being hung on the top of the guardrail or the baffle, so that the guardrail or the baffle is clamped between the triangular support and the side wall of the L-shaped frame; the clamp comprises a screw rod, an abutting head at both ends of the screw rod and a knob, a thread is arranged on the outer wall of the screw rod, the screw rod is arranged in the side wall of the L-shaped frame, and the knob is tightened, so that the guardrail or the baffle is respectively abutted on the side wall of the triangular support and the abutting head.

[0021] The utility model discloses beneficial effect has:

[0022] The utility model provides an edge operation anti-falling device, which comprises a falling prevention pad, a support frame assembly, a fence assembly and a fixing assembly. The support frame assembly comprises four L-shaped beams, which are detachably connected and arranged around the falling prevention pad. The fence assembly comprises four L-shaped fences, which are vertically arranged on the corresponding L-shaped fences and form a falling prevention area. The falling prevention pad can receive falling objects and is suitable for small-size objects, and has strong universality. The support assembly supports and fixes the falling prevention pad and the fence assembly. The fence assembly is arranged around the falling prevention pad to prevent the falling objects from rolling off. The fixing assembly is arranged on the outer wall of the L-shaped beam near the guardrail or the baffle, which facilitates the fixation of the support frame assembly to the guardrail or the baffle. In specific use, the L-shaped beam near the guardrail or the baffle is fixed by the fixing assembly, and then the other L-shaped beams, the fence assembly and the falling prevention pad are connected, which is simple in installation and high in work efficiency. Moreover, the L-shaped beams and the falling prevention pad are detachably connected, which facilitates the carrying of the entire edge operation anti-falling device. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the top view of the edge operation anti-falling device provided by the utility model embodiment;

[0024] Figure 2 is the top view of the falling prevention pad in the edge operation anti-falling device provided by the utility model embodiment;

[0025] Figure 3 is the front view of the assembly of the L-shaped beam, the L-shaped fence and the falling prevention ring in the edge operation anti-falling device provided by the utility model embodiment;

[0026] Figure 4 is the top view of the assembly of the L-shaped beam, the L-shaped fence and the falling prevention ring in the edge operation anti-falling device provided by the utility model embodiment;

[0027] Figure 5 is the side view of the assembly of the L-shaped beam, the L-shaped fence and the falling prevention ring in the edge operation anti-falling device provided by the utility model embodiment;

[0028] Figure 6 is the front view of the L-shaped beam and the L-shaped fence, the fixing assembly and the triangular support assembly in the edge operation anti-falling device provided by the embodiment of the utility model;

[0029] Figure 7 is the plan view of the L-shaped beam and the L-shaped fence, the fixing assembly and the triangular support assembly in the edge operation anti-falling device provided by the embodiment of the utility model;

[0030] Figure 8 is the side view of the L-shaped beam and the L-shaped fence, the fixing assembly and the triangular support assembly in the edge operation anti-falling device provided by the embodiment of the utility model;

[0031] Figure 9 the front view of the straight beam and the straight fence and the anti-falling ring assembly in the edge operation anti-falling device provided by the embodiment of the utility model;

[0032] Figure 10 is the plan view of the straight beam and the straight fence and the anti-falling ring assembly in the edge operation anti-falling device provided by the embodiment of the utility model;

[0033] Figure 11 is the side view of the straight beam and the straight fence and the anti-falling ring assembly in the edge operation anti-falling device provided by the embodiment of the utility model;

[0034] Figure 12 is the first structure schematic view of the clamp in the edge operation anti-falling device provided by the embodiment of the utility model;

[0035] Figure 13 is the second structure schematic view of the clamp in the edge operation anti-falling device provided by the embodiment of the utility model;

[0036] Figure 14 is the use state diagram of the edge operation anti-falling device under the guardrail working condition provided by the embodiment of the utility model;

[0037] Figure 15 is the use state diagram of the edge operation anti-falling device under the baffle working condition provided by the embodiment of the utility model.

[0038] In the drawing:

[0039] 10, guardrail; 20, baffle; 30, operation object;

[0040] 100, anti-falling pad; 210, L-shaped beam; 220, straight beam; 230, zipper; 310, L-shaped fence; 320, straight fence; 400, fixing assembly; 410, L-shaped frame; 420, clamp; 421, screw rod; 422, knob; 423, abutting head; 500, anti-falling ring; 600, triangular support. DETAILED DESCRIPTION

[0041] The utility model will be described in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are merely intended to explain the utility model and not to limit the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description, not all the structures.

[0042] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0043] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "lower", "lower" and "lower" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0044] In the description of the embodiment, the terms "upper", "lower", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in description, and have no special meaning.

[0045] The edge operation anti-falling device provided by the embodiment has strong universality, is simple to disassemble and assemble, and is convenient to carry.

[0046] Specifically, as Figures 1 to 15As shown, the edge operation anti-falling device includes an anti-falling pad 100, a support frame assembly, an enclosure assembly, and a fixing assembly 400. The support frame assembly includes four L-shaped beams 210, which are sequentially and detachably connected end to end and surround the anti-falling pad 100. The enclosure assembly includes four L-shaped enclosures 310, which correspond to the L-shaped beams 210 one by one, and the four L-shaped enclosures 310 are respectively vertically arranged on the corresponding L-shaped enclosures 310 and surround to form an anti-falling area. The fixing assembly 400 is used to fix the support frame assembly to the guardrail 10 or the baffle 20, and the fixing assembly 400 is located on the outer wall of the L-shaped beam 210 close to the guardrail 10 or the baffle 20.

[0047] Based on the above design, the four L-shaped beams 210 are detachably connected and surround the anti-falling pad 100; the four L-shaped enclosures 310 are respectively vertically arranged on the corresponding L-shaped enclosures 310 and surround to form an anti-falling area. The anti-falling pad 100 can receive falling objects, and is also suitable for small volume objects, and has strong universality; the support assembly plays a role in supporting and fixing the anti-falling pad 100 and the enclosure assembly; the enclosure assembly surrounds the anti-falling pad 100 to prevent the objects falling on the anti-falling pad 100 from rolling. The fixing assembly 400 is located on the outer wall of the L-shaped beam 210 close to the guardrail 10 or the baffle 20, which facilitates fixing the support frame assembly to the guardrail 10 or the baffle 20. In specific use, the L-shaped beam 210 on one side of the guardrail 10 or the baffle is fixed through the fixing assembly 400, and then the other L-shaped beams 210, the enclosure assembly and the anti-falling pad 100 are connected, which is simple to install and has high work efficiency; and since the L-shaped beams 210 and the anti-falling pad 100 are detachably connected, the whole edge operation anti-falling device is convenient to carry.

[0048] Further, as shown in Figure 6 , Figure 7 , Figure 8 , Figure 14 and Figure 15 , the edge operation anti-falling device further includes a triangular support 600, one right angle edge of the triangular support 600 abuts against the L-shaped beam 210, and the other right angle edge of the triangular support 600 abuts against the guardrail 10 or the baffle 20, which increases the support of the edge operation anti-falling device and prevents the edge operation anti-falling device from tilting downward due to gravity.

[0049] Further, as shown in Figure 6 , Figure 7 , Figure 8 , Figure 12 and Figure 13As shown, the fixing assembly 400 comprises an L-shaped frame 410 and a clamp 420. The L-shaped frame 410 can be hung on the top of the guardrail 10 or the baffle 20, so that the guardrail 10 or the baffle 20 is clamped between the side wall of the L-shaped frame 410 and the triangular support 600. The clamp 420 comprises a screw rod 421, an abutting head 423 and a knob 422 at both ends of the screw rod 421. The outer wall of the screw rod 421 is provided with a thread. The screw rod 421 is arranged in the side wall of the L-shaped frame 410. The knob 422 is tightened, so that the guardrail 10 or the baffle 20 is respectively abutted to the side wall of the triangular support 600 and the abutting head 423. That is, the knob 422 is screwed, so that the abutting head 423 is close to or away from the guardrail 10 or the baffle 20, so as to install or disassemble the L-shaped frame 410.

[0050] In the embodiment, the abutting head 423 has two shapes. One side surface of one of the abutting heads 423 is a plane, which can abut on the baffle 20 with a flat surface. The other side surface of the other abutting head 423 is an arc, which can abut on the cylindrical guardrail 10. Of course, the abutting head 423 can also have other shapes, which can be set as required.

[0051] Optionally, the support frame assembly further comprises two groups of straight beams 220. The two groups of straight beams 220 are respectively located on opposite sides of the fall arrest pad 100. Each group of straight beams 220 is located between two adjacent L-shaped beams 210. In each group of straight beams 220, the two adjacent straight beams 220 and the straight beam 220 and the L-shaped beam 210 are detachably connected. The enclosing assembly further comprises two groups of straight enclosures 320. The straight enclosures 320 correspond to the straight beams 220 one by one. The straight enclosures 320 are vertically arranged on the straight beams 220. The four L-shaped enclosures 310 and the two groups of straight enclosures 320 form a fall arrest area. The fall arrest area can be increased, and the length of one side of the L-shaped beam 210 can be avoided, so as to facilitate carrying.

[0052] Further, as shown in the drawings, Figure 1 One group of straight beams 220 is located on the side close to the guardrail 10 or the baffle 20, and the other group of straight beams 220 is located on the side away from the guardrail 10 or the baffle 20.

[0053] It should be noted that in the embodiment, the straight beam 220 is connected to the shorter side end of the L-shaped beam 210.

[0054] The number of each group of straight beams 220 can be one, two or four, which can be set as required.

[0055] Of course, the support frame assembly can also not be provided with the straight beam 220.

[0056] Optionally, the inner sides of the L-shaped beam 210 and the straight beam 220 are provided with a zipper 230. The L-shaped beam 210 and the straight beam 220 are detachably connected to the fall arrest pad 100 through the zipper 230, which further improves the detachability and portability of the edge operation fall arrest device.

[0057] Optionally, the L-shaped beams 210 are integrally formed with the L-shaped barriers 310, and the straight beams 220 are separately arranged with the straight barriers 320; or the L-shaped beams 210 and the L-shaped barriers 310 are integrally formed, and the straight beams 220 and the straight barriers 320 are integrally formed; or the L-shaped beams 210 and the L-shaped barriers 310 are integrally formed, and the straight beams 220 and the straight barriers 320 are also integrally formed.

[0058] It should be noted that the L-shaped barriers 310 and the straight barriers 320 are made of relatively hard materials, and only the end portions of the adjacent two L-shaped barriers 310 and the end portions of the adjacent L-shaped barriers 310 and the straight barriers 320 are fixed, the L-shaped barriers 310 and the straight barriers 320 can be vertically fixed.

[0059] Optionally, the adjacent two L-shaped beams 210, the adjacent two straight beams 220, and the adjacent L-shaped beam 210 and straight beam 220 are connected by a screw. For example, between the two L-shaped beams 210, the end surface of one of the L-shaped beams 210 is extended to be provided with a screw, and the end surface of the other L-shaped beam 210 is provided with a threaded hole, and the two L-shaped beams 210 are connected by the screw and the threaded hole; between the two straight beams 220, the end surface of one of the straight beams 220 is extended to be provided with a screw, and the end surface of the other straight beam 220 is provided with a threaded hole, and the two straight beams 220 are connected by the screw and the threaded hole; between the adjacent L-shaped beam 210 and straight beam 220, the end surface of one of the two is extended to be provided with a screw, and the end surface of the other is provided with a threaded hole, and the L-shaped beam 210 and the straight beam 220 are connected by the screw and the threaded hole.

[0060] Optionally, the edge operation anti-falling device further comprises a plurality of anti-falling rings 500, and the plurality of anti-falling rings 500 are respectively located on the L-shaped beams 210 and the straight beams 220. The rope passes through the anti-falling rings 500 to pre-fix the L-shaped beams 210 and the straight beams 220 to the guardrails 10 or the baffle plates 20, so that the L-shaped beams 210 and the straight beams 220 to be installed can be roughly fixed to the guardrails 10 or the baffle plates 20 in advance, and the installation position can be adjusted according to specific needs; and the L-shaped beams 210 and the straight beams 220 can also be prevented from falling during disassembly.

[0061] In this embodiment, as shown in Figure 6 the fixing assembly 400 is fixedly connected to the two L-shaped beams 210, therefore, the anti-falling rings 500 on the two L-shaped beams 210 can be arranged on the fixing assembly 400.

[0062] In order to increase the stability of the edge operation anti-falling device, the number of the fixing assemblies 400 is two, and the two fixing assemblies 400 are respectively located on the two L-shaped beams 210 close to the guardrails 10 or the baffle plates 20.

[0063] It should be noted that, in order to reduce the weight of the entire edge operation anti-falling device, the L-shaped beam 210, the straight beam 220, the L-shaped beam 210, etc. in the edge operation anti-falling device are made of light metal.

[0064] In actual use, first, the parts needed (including the assembly of the L-shaped beam 210 and the L-shaped fence 310, the assembly of the straight beam 220 and the straight fence 320, and the assembly of the L-shaped beam 210 and the L-shaped fence 310 and the fixing assembly 400, etc.) are connected to the guardrail 10 or the baffle 20 near the operating object 30 by the anti-falling ring 500 through the use of the rope (here, a strong and soft rope is used); then the L-shaped straight beam 220 and the straight beam 220 or the L-shaped beam 210 and the L-shaped beam 210 are connected by screw assembly, and attention should be paid to the problems such as the fact that the zipper 230 is all directed inward and the cooperation of the screw and the threaded hole during installation; then the anti-falling pad 100 and the surrounding L-shaped beam 210 or straight beam 220 are connected through the zipper 230, and the overall assembly is confirmed to be firm; after the assembly is completed, the edge operation anti-falling device is moved to the outside of the guardrail 10 or the baffle 20 as a whole, and the edge operation anti-falling device is placed through the rope; after the placement is completed, the edge operation anti-falling device is hung to the top of the guardrail 10 or the baffle 20 through the L-shaped frame 410, and then the knob 422 is screwed to tighten; after the work is completed, the items on the anti-falling pad 100 are cleaned first, then the knob 422 is loosened, the edge operation anti-falling device is taken off from the guardrail 10 or the baffle 20, and the edge operation anti-falling device is pulled back into the guardrail 10 or the baffle 20 for disassembly through the use of the rope.

[0065] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A fall arrest device for edge work, characterised in that, The application relates to a falling prevention device for edge operation. The falling prevention device comprises a falling prevention pad (100), a support frame assembly, four L-shaped beams (210) which are sequentially and detachably connected in a head-to-tail mode and surround the falling prevention pad (100), a surrounding assembly, four L-shaped surrounding parts (310) which correspond to the L-shaped beams (210) and are vertically arranged on the L-shaped surrounding parts (310) to form a falling prevention area, and a fixing assembly (400) which is used for fixing the support frame assembly to a guardrail (10) or a baffle (20) and is arranged on the outer wall of the L-shaped beam (210) which is close to the guardrail (10) or the baffle (20). The support frame assembly further comprises two groups of straight beams (220) which are arranged on opposite sides of the falling prevention pad (100), each group of the straight beams (220) is arranged between two adjacent L-shaped beams (210), and the straight beams (220) in each group are detachably connected with each other and with the L-shaped beams (210); the surrounding assembly further comprises two groups of straight surrounding parts (320) which correspond to the straight beams (220) and are vertically arranged on the straight beams (220), and the L-shaped surrounding parts (310) and the straight surrounding parts (320) form the falling prevention area. One group of the straight beams (220) is arranged on the side close to the guardrail (10) or the baffle (20), and the other group of the straight beams (220) is arranged on the side away from the guardrail (10) or the baffle (20). The inner sides of the L-shaped beams (210) and the straight beams (220) are provided with zippers (230), and the L-shaped beams (210) and the straight beams (220) are detachably connected with the falling prevention pad (100) through the zippers (230).

2. The fall arrest device for use on the edge according to claim 1, characterized in that The L-shaped beams (210) and the L-shaped surrounding parts (310) are integrally formed; and / or 3. The fall arrest device for use on the edge according to claim 2, characterized in that The straight beams (220) and the straight surrounding parts (320) are integrally formed.

4. The fall arrest device for use on the edge according to claim 2, characterized in that The L-shaped beams (210), the straight beams (220) and the L-shaped beams (210) and the straight beams (220) are connected through threads.

5. The fall arrest device for use on the edge according to claim 2, characterized in that The falling prevention device for edge operation further comprises a plurality of falling prevention rings (500) which are arranged on the L-shaped beams (210) and the straight beams (220), and a rope is used for pre-fixing the L-shaped beams (210) and the straight beams (220) to the guardrail (10) or the baffle (20) through the falling prevention rings (500). The number of the fixing assemblies (400) is two, and the two fixing assemblies (400) are arranged on two L-shaped beams (210) which are close to the guardrail (10) or the baffle (20).

6. The fall arrest device for use on the edge according to claim 2, characterized in that ​ 7. The fall arrest device for use on the edge according to claim 2, characterized in that ​ 8. The fall arrest device for use on the edge according to claim 1, characterized in that ​ 9. The fall arrest device for use on the edge according to claim 1, characterized in that The edge operation anti-falling device further comprises a triangular support (600), one right angle side of the triangular support (600) abutting against the L-shaped beam (210), and the other right angle side of the triangular support (600) abutting against the guardrail (10) or the baffle (20).

10. The fall arrest device for use on the edge according to claim 9, characterized in that The fixing assembly (400) comprises an L-shaped frame (410) and a clamp (420), the L-shaped frame (410) can be hung on the top of the guardrail (10) or the baffle (20), so that the guardrail (10) or the baffle (20) is clamped between the triangular support (600) and the side wall of the L-shaped frame (410); the clamp (420) comprises a screw rod (421), an abutting head (423) and a knob (422) at both ends of the screw rod (421), the outer wall of the screw rod (421) is provided with a thread, the screw rod (421) is arranged in the side wall of the L-shaped frame (410), and the knob (422) is tightened, so that the guardrail (10) or the baffle (20) is respectively abutted against the side wall of the triangular support (600) and the abutting head (423) on both sides.

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