Suspended scaffolding hook

Abstract

To provide a hook for a suspended scaffold, which can be inserted into the insertion part of a connecting piece to a desired position, and can appropriately receive an acting load to achieve a stable suspended state. [Solution] In a hook (10) having an eye ring portion (13) connected to a hook portion (11) via a neck portion (12) and equipped with a pull-out prevention lever (14) that opens and closes the opening of the hook portion (11) from the inside, the hook portion (11) has a main portion (11a) whose inner edge extending downward from the neck portion (12) is straight, a tapered hook tip portion (11b) connected to the lower end of the main portion (11a) points diagonally outward and upward, an inward return portion (11c) is provided at the tip of the hook tip portion (11b), the width of the base of the hook tip portion (11b) is narrower than the width of the lower end of the main portion (11a), and a valley portion (16) is formed on the inner edge of the part between the main portion (11a) and the hook tip portion (11b) into which a connecting piece (23) to the supporting member of the scaffolding board fits.

Description

[Technical Field]

[0001] This invention relates to a hook that connects a connecting piece attached to a member supporting a scaffolding board to a suspension chain when setting up a suspended scaffolding. [Background technology]

[0002] Generally, when work needs to be done at high altitudes where it is difficult to assemble scaffolding from the ground, such as in the maintenance of bridges and high-rise buildings, or in large-scale plant construction, suspended scaffolding is used, which is suspended from upper structural members such as beams and girders using pipes that serve as support members for suspension chains and scaffolding boards, and connecting pieces made of hooks and pipes.

[0003] As an example of the installation of this suspended scaffolding, as shown in Figure 6, a loop is formed at the bottom of a suspension chain 21 hanging down from an upper structural member, a ring-shaped connecting fitting 22 called a shack link is hung on the loop, and a loading hook 30 (see Patent Document 1 below) is hung on the loop to hang a longitudinal pipe 24 via a connecting piece 23, and a scaffolding board 26 is placed on a widthwise pipe 25 that is stretched across the top of this pipe 24.

[0004] The hook 30 used in the above installation example has a hook portion 31 and an eye ring portion 33 integrally connected to it via a neck portion 32, and is equipped with a locking lever 34 that opens and closes the opening of the hook portion 31 from the inside as it swings.

[0005] The hook portion 31 of the hook 30 is curved in an arc from the tip to the neck portion 32, becoming thicker on the neck 32 side, and has a protruding portion 31a that bends outward at the tip. The inside of the hook portion 31 is arc-shaped from the neck 32 side to the tip side, and the inner diameter of the eye ring portion 33 is smaller than the inner diameter of the hook portion 31. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-264953 Summary of the Invention [Problem to be solved by the invention]

[0007] Incidentally, the connecting piece 23 used in the installation example of Figure 6 is owned by a contractor who assembles suspended scaffolding and is used at various work sites, and the hook 30 sold separately has the problem that the hook part 31 may not be inserted sufficiently into the insertion part formed between the connecting piece 23 and the pipe 24 to ensure stability, and also has the problem of low working load.

[0008] Therefore, the object of this invention is to provide a hook for a suspended scaffold that can insert the hook portion into the insertion portion of the connecting piece to the desired position, appropriately absorb the applied load, and achieve a stable suspended state. [Means for solving the problem]

[0009] In order to solve the above problems, this invention provides a hook in which an eye ring portion is connected to a hook portion via a neck portion, and which is equipped with a locking lever that opens and closes the opening of the hook portion from the inside as it swings, The hook portion has a straight inner edge of a trunk portion extending downward from the neck portion, a tapered hook tip portion connected to the lower end of the trunk portion and directed obliquely outward and upward, and a tip of the hook tip portion is provided with a turn inward, The width of the base of the tip of the hook is narrower than the width of the lower end of the main body, and a valley is formed on the inner edge of the part between the main body and the tip of the hook, into which the connecting piece to the support member of the scaffolding board fits.

[0010] The inner diameter of the eye ring portion is larger than the inner diameter of the arcuate edge formed in the valley portion of the hook portion.

[0011] In addition, the hook portion is provided with a guide mark on the outer surface of the part of the hook tip near the base, indicating that the suspension angle of the scaffolding is an inclination angle that requires caution. [Effects of the Invention]

[0012] The hook for a suspended scaffold according to this invention has a base width of the tip that is narrower than the width of the lower end of the main part of the hook, so that the tip can be inserted deep into the insertion part of the connecting piece to the support member of the scaffolding board to a predetermined position. As a result, the connecting piece to the support member of the scaffolding board fits into and is held in place in the valley formed on the inner edge of the part between the main part and the tip, creating a stable suspended state and effectively ensuring the working load.

[0013] In addition, when there is no load during the scaffolding assembly process or when the hook tilts toward the opening of the hook portion, the return portion provided at the tip of the hook tip prevents the hook tip from coming out of the connecting piece.

[0014] Furthermore, the inner diameter of the eye ring portion is larger than the inner diameter of the arc-shaped edge formed in the valley portion of the hook portion, so that a high-strength suspension chain with large links can be passed directly through the eye ring portion to set up the suspended scaffolding.

[0015] In addition, if a guide mark is placed on the outer surface of the hook near the base of the tip to indicate that the scaffolding is at an angle that requires caution, the guide mark can be used as a reference to hang the scaffolding within a safe hanging angle range. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view showing a hanging part of a suspended scaffolding using a hook according to an embodiment of the present invention. [Figure 2] FIG. 1 is a front view and a side view of the hook; [Figure 3] FIG. 10 is a front view showing the state in which the suspending load and the lifting force act on the axis of the hook. [Figure 4] A front view showing the state where the hanging angle of the same is the angle of the guide mark [Figure 5] A front view showing the state where the hanging angle of the same is set to an angle that hides the guide mark. [Figure 6] A perspective view showing the suspension part of a conventional suspended scaffold using hooks DETAILED DESCRIPTION OF THE INVENTION

[0017] An embodiment of the present invention will be described below with reference to FIGS.

[0018] Figure 1 shows the suspension part of a suspended scaffold using a hook 10 according to this invention. In this installation example, a longitudinal pipe 24 is suspended and supported by a suspension chain 21 hanging from an upper structural member such as a beam or girder via the hook 10 and a connecting piece 23, and a widthwise pipe 25 is placed across the longitudinal pipe 24, on which a scaffolding board 26 is placed to construct a work platform.

[0019] As shown in Figure 2, the hook 10 has a hook portion 11 connected to an eye ring portion 13 via a neck portion 12, and is equipped with a locking lever 14 that opens and closes the opening of the hook portion 11 from the inside as it swings, and the locking lever 14 is biased by a spring 15 in the direction in which the opening of the hook portion 11 closes.

[0020] The hook portion 11 has a shape in which the inner and outer edges of the main portion 11a are parallel to each other in straight lines, a tapered hook tip portion 11b is connected to the lower end of the main portion 11a so as to extend diagonally outward and upward, and a return portion 11c is provided at the tip of the hook tip portion 11b so as to extend inward, and a valley portion 16 is formed on the inner edge of the part between the lower end of the main portion 11a and the base of the hook tip portion 11b.

[0021] In the hook portion 11, the width W2 at the base of the hook tip portion 11b is much narrower than the width W1 at the lower end of the main portion 11a.

[0022] The inner diameter d1 of the eye ring portion 13 is significantly larger than the inner diameter d2 of the arcuate edge formed at the valley portion 16 of the hook portion 11.

[0023] The axis aL of the hook 10 is an imaginary line that passes through the center O1 of the eye ring portion 13 and is parallel to the inner edge of the main portion 11a, and the center O2 of the arc-shaped edge of the valley portion 16 of the hook portion 11 is located on the axis aL of the hook 10.

[0024] 3, a guide mark 17 for the suspension angle is marked on the outer surface of the base of the hook tip 11b. As shown in FIG. 4, the guide mark 17 indicates that the suspension angle θ of the scaffold, which is the angle between the axis aL of the hook 10 and the suspension load Fd acting on the valley portion 16, is an inclination angle requiring caution (30° in this example).

[0025] To assemble a suspended scaffolding using such a hook 10, as shown in Figure 1, the lower part of the suspension chain 21 hanging down from the upper structural member is passed through the eye ring part 13 to form a loop, and a connecting piece 23 is pre-attached to a pipe 24 running along the length of the scaffolding, and the hook part 11 of the hook 10 is inserted into the insertion part formed between the connecting piece 23 and the pipe 24, starting from the side of the return part 11c at the tip.

[0026] Then, a pipe 25 in the width direction is placed across the pipe 24, and the pipes 24, 25 are combined and joined in a lattice pattern (not shown), and scaffolding boards 26 are placed on the pipes 25.

[0027] As shown in Figure 2, the hook 10 for the suspended scaffolding described above has a width W2 at the base of the tip 11b of the hook that is significantly narrower than the width W1 at the lower end of the main part 11a of the hook portion 11, so that the tip 11b can be inserted to a predetermined deep position into the insertion portion of the connecting piece 23 owned by the contractor, as shown in Figures 1 and 3.

[0028] As a result, the connecting piece 23 fits into and is held in the valley 16 between the main part 11a and the tip 11b, creating a stable hanging state, and the hanging load acts on the part that is designed to be the strongest, so the working load can be effectively secured.

[0029] In addition, when there is no load during the scaffolding assembly process or when the hook 10 tilts toward the opening side of the hook portion 11, the return portion 11c provided at the tip of the hook tip portion 11b prevents the hook tip portion 11b from coming off the connecting piece 23.

[0030] Furthermore, as shown in Figure 2, the inner diameter d1 of the eye ring portion 13 is larger than the inner diameter d2 of the arc-shaped edge formed in the valley portion 16 of the hook portion 11, so that without using a shackle link as in the past, a high-strength suspension chain 21 with large links can be passed directly through the eye ring portion 13, as shown in Figure 1, to set up a suspended scaffolding.

[0031] In addition, when the scaffolding is suspended, as shown in Figure 3, it is desirable that the suspension load Fd acting on the hook portion 11 and the lifting force Fu acting on the eye ring portion 13 are aligned on the axis aL of the hook 10 in a vertical position, from the standpoint of ensuring safety and protecting the components.

[0032] However, in the actual installation situation of a suspended scaffolding, the hook 10 may tilt due to a misalignment between the attachment position of the suspension chain 21 to the upper structural member and the attachment position of the connecting piece 23 to the pipe 24, as shown in Figures 4 and 5, and a force in the direction of opening the opening of the hook portion 11 acts on the valley portion 16, making it easier for the hook tip portion 11b to come out of the connecting piece 23.

[0033] Therefore, as shown in Figure 4, when the suspension angle θ of the scaffolding reaches approximately 30° and the connecting piece 23 is aligned with the visible guide mark 17, the contractor determines that the suspension angle θ is close to the limit of the inclination angle permitted safely, and adjusts the attachment position of the connecting piece 23 to the pipe 24 as much as possible.

[0034] Furthermore, as shown in Figure 5, when the suspension angle θ of the scaffolding reaches approximately 45° and the guide mark 17 is hidden by the connecting piece 23, the contractor will determine that the suspension angle θ is an inclination angle that exceeds the limit permitted for safety, and will be sure to adjust the attachment position of the connecting piece 23 to the pipe 24, etc., to ensure safety.

[0035] In this way, by marking a guide mark 17 on the outer surface of the part of the hook tip 11b of the hook portion 11 near the base, which indicates that the suspension angle θ of the scaffolding is an inclination angle that requires caution, the scaffolding can be suspended within a safe range of suspension angle θ by referring to the guide mark 17, and serious accidents such as the collapse of the scaffolding can be prevented. [Explanation of symbols]

[0036] 10 Hooks 11 Hook part 11a Core 11b Hook tip 11c Return 12 Neck 13 Eye Ring Club 14 Retaining lever 15 Spring 16 Valley 17 Guide Mark 21 Hanging chain 23 Connecting Pieces 24,25 Pipe (support member) 26 Scaffolding Plank

Claims

1. A hook (10) having a hook portion (11) and an eye ring portion (13) connected to the hook portion (11) via a neck portion (12), and equipped with a retaining lever (14) that opens and closes the opening of the hook portion (11) from the inside as it swings, The hook portion (11) has a main portion (11a) extending downward from the neck portion (12) with a straight inner edge, a tapered hook tip portion (11b) connected to the lower end of the main portion (11a) and directed obliquely outward and upward, and an inward return portion (11c) is provided at the tip of the hook tip portion (11b), A hook for suspended scaffolding characterized in that the width of the base of the tip portion (11b) is narrower than the width of the lower end of the main portion (11a), and a valley portion (16) is formed on the inner edge of the part between the main portion (11a) and the tip portion (11b) into which a connecting piece to the support member of the scaffolding board fits.

2. A hook for suspended scaffolding as described in claim 1, characterized in that the inner diameter of the eye ring portion (13) is larger than the inner diameter of the arc-shaped edge formed in the valley portion (16) of the hook portion (11).

3. A hook for suspended scaffolding as described in claim 1 or 2, characterized in that the hook portion (11) has a guide mark (17) printed on the outer surface of the part of the hook tip (11b) near the base, which indicates that the suspension angle of the scaffolding is an inclination angle that requires caution.

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