Scaffolding suspension chain

Abstract

To provide a suspension chain for a scaffold that makes a locking tool for locking a hook less likely to be broken even when the chain is roughly handled.SOLUTION: A suspension chain for a scaffold includes: a hook 3 having a hook base part 5 to which one end of a chain 2 is connected, and a hook tip part 6 to be hooked on a link 1a in an intermediate part of the chain 2, wherein a link housing groove 7 is formed between the hook base part 5 and the hook tip part 6; and a stopper 4 configured to close an opening at the upper end of the link housing groove 7 so that the link 1a does not come off from the link housing groove 7. In the suspension chain for the scaffold, the stopper 4 is formed of rubber or elastomer.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a suspension chain for scaffolding. [Background technology]

[0002] Suspended scaffolding is used at sites where it is difficult to assemble scaffolding from the ground, such as bridge and highway repair sites. Suspended scaffolding is a scaffolding that is suspended from a structure such as a beam by a chain. For example, the scaffolding suspension chain of Patent Document 1 is known as a chain used for this suspended scaffolding.

[0003] The scaffolding suspension chain in Patent Document 1 has a chain made up of multiple circular links connected in a series, and hooks on both ends of the chain. The scaffolding suspension chain is wound around a structure such as a beam so that the chain hangs down from the structure, and a hook at the bottom end of the chain is hooked onto a link in the middle of the chain to form a loop, which supports the scaffolding.

[0004] Incidentally, the scaffolding suspension chain of Patent Document 1 has a hook at one end of the chain that is attached to a link in the middle of the chain and has an anti-detachment fitting on the hook to prevent the hook from accidentally coming off the link after the hook is hooked onto the link in the middle of the chain.

[0005] That is, in the scaffolding suspension chain of Patent Document 1, the hook provided at one end of the chain has a hook base to which one end of the chain is connected and a hook tip to be hooked onto a link in the middle of the chain, and a link receiving groove with an open upper end and a closed lower end is formed between the hook base and hook tip, so that when the hook tip is hooked onto a link of the chain, the link is received in the link receiving groove. A hairpin-shaped anti-detachment fitting is rotatably attached to the hook base, and the upper opening of the link receiving groove is closed with the anti-detachment fitting to hold the link of the chain within the link receiving groove, preventing the hook from coming off the chain. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2000-104399 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, the scaffolding suspension chain of Patent Document 1 has a problem in that the hairpin-shaped anti-detachment fittings attached to the hooks are prone to deformation and breakage.

[0008] That is, scaffolding chains are often roughly handled when preparing to install them at a site or when removing them after use at the site. Therefore, the hairpin-shaped anti-detachment fittings attached to the hooks of scaffolding chains can become deformed due to impacts such as hitting other chains. If the anti-detachment fittings are deformed, the deformed anti-detachment fittings do not function properly and get in the way when hooking the tip of the hook to the link in the middle of the chain, making it difficult to hook the tip of the hook to the link. In addition, once the anti-detachment fittings are deformed, it is not easy to repair the deformation. Therefore, when the anti-detachment fittings are deformed due to impacts such as hitting other chains, the anti-detachment fittings are sometimes removed from the hooks and instead, packing tape is wrapped around the hooks to prevent the hooks from coming off the chains.

[0009] The problem to be solved by this invention is to provide a suspension chain for scaffolding in which the stopper for preventing the hook from coming off the chain is not easily damaged even when the chain is roughly handled. [Means for solving the problem]

[0010] In order to solve the above problems, the present invention provides a suspension chain for scaffolding having the following configuration. [Configuration 1] a chain consisting of a plurality of circular links connected in series; a hook having a hook base to which one end of the chain is connected and a hook tip to be hooked onto the link, a link receiving groove having an open upper end and a closed lower end formed between the hook base and the hook tip, the link being received in the link receiving groove when the hook tip is hooked onto the link; a stopper for closing an opening at an upper end of the link receiving groove to prevent the link from coming off the link receiving groove, A scaffolding suspension chain, characterized in that the stopper is made of rubber or elastomer.

[0011] With this configuration, the stopper is made of rubber or elastomer, so when an external force is applied to the stopper, it only undergoes elastic deformation, not plastic deformation, and therefore can be prevented from being damaged even when the scaffolding suspension chain is roughly handled and the stopper is subjected to an impact, such as by hitting another chain.

[0012] [Configuration 2] the stopper is an annular member that is wrapped around, in an elastically stretched state, an edge of the hook tip portion opposite to the link accommodating groove and an edge of the hook base portion opposite to the link accommodating groove, A scaffolding suspension chain as described in configuration 1, in which a retaining portion for holding the anti-slip device is provided on the edge of the hook base opposite the link accommodating groove.

[0013] When this configuration is adopted, the stopper is an annular member that is elastically stretched and wound between the hook tip and the hook base, so that the stopper can be easily replaced. Therefore, by preparing a spare stopper, even if the stopper is damaged on-site, it can be replaced with a new stopper and the scaffolding suspension chain can be used continuously. In addition, when the stopper is removed from the hook tip, the part of the stopper that is hung on the hook base is held by the holding part, so that it is easy to hang the stopper on the hook tip again.

[0014] [Configuration 3] A scaffolding suspension chain as described in configuration 2, wherein a knob portion extending in a direction away from the hook base portion is provided at the portion of the anti-slip device that is hung on the hook tip portion.

[0015] When this configuration is adopted, the worker can elastically stretch the anti-detachment device by grasping the handle with his / her hand and pulling it away from the hook base, making it easier to hook the anti-detachment device onto the tip of the hook and to remove the anti-detachment device from the tip of the hook.

[0016] [Configuration 4] The hook is formed of a steel plate, A scaffolding suspension chain as described in configuration 3, wherein the anti-slip device has an elongated inner peripheral shape in a direction perpendicular to the thickness direction of the hook when in a natural state without elastic deformation.

[0017] When this configuration is adopted, the anti-detachment device has an elongated inner circumference shape when in its natural state without elastic deformation, so that when the anti-detachment device is removed from the tip of the hook, the anti-detachment device can be prevented from shifting and moving around the base of the hook, making it possible to stabilize the position of the knob portion.

[0018] [Configuration 5] A scaffolding suspension chain as described in configuration 4, wherein the anti-slip device is formed so that, when in a natural state without elastic deformation, the inner width of the end of the inner circumference of the anti-slip device on the side of the tip of the hook is wider than the inner width of the end of the inner circumference of the anti-slip device on the side of the base of the hook.

[0019] When this configuration is adopted, the inner width of the end of the inner periphery of the anti-detachment device on the hook tip side is wide, making it easier to hang the anti-detachment device on the hook tip.

[0020] [Configuration 6] A scaffolding suspension chain as described in any one of configurations 2 to 5, wherein a locking protrusion is formed on the edge of the tip of the hook opposite the link accommodating groove, which restricts the upward movement of the anti-slip device.

[0021] When this configuration is adopted, the locking protrusion formed on the tip of the hook restricts the upward movement of the anti-detachment device, so that after the anti-detachment device is hung on the tip of the hook, it is possible to effectively prevent the anti-detachment device from coming off the tip of the hook even if some external force acts on the anti-detachment device.

[0022] [Configuration 7] A scaffolding suspension chain as described in any one of configurations 2 to 5, wherein the retaining portion is a notch formed so as to extend into the interior of the hook base from the edge of the hook base opposite the side of the link accommodating groove.

[0023] When this configuration is adopted, the holding portion can be easily formed by press working or the like, resulting in low cost.

[0024] [Configuration 8] A scaffolding suspension chain as described in configuration 7, wherein the retaining portion has a narrow portion that restricts the passage of the anti-detachment device when the anti-detachment device is in its natural state without elastic deformation, and allows the anti-detachment device to pass by elastically deforming the anti-detachment device so that its cross-sectional shape becomes smaller.

[0025] When this configuration is adopted, a narrow portion is provided in the holding portion, so that unless the anti-detachment device is elastically deformed so that its cross-sectional shape becomes smaller, the anti-detachment device will not come out of the holding portion, and the anti-detachment device can be securely held in the holding portion. Effect of the Invention

[0026] In the scaffolding suspension chain of this invention, the stopper is made of rubber or elastomer, so when an external force is applied to the stopper, it only undergoes elastic deformation, not plastic deformation. Therefore, even if the scaffolding suspension chain is roughly handled and the stopper is subjected to an impact such as by hitting another chain, the stopper can be prevented from being damaged. [Brief description of the drawings]

[0027] [Figure 1] FIG. 1 is a diagram showing a scaffolding suspension chain according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view showing only the hook of the scaffolding suspension chain of FIG. 1; [Diagram 3] FIG. 2 is a perspective view showing only the stopper for the scaffolding suspension chain of FIG. 1; [Figure 4] FIG. 2 is an enlarged partial cross-sectional view showing the vicinity of a hook at one end of the chain in FIG. 1. [Diagram 5] Cross-sectional view taken along line VV in Figure 4. [Figure 6] FIG. 5 is a partial cross-sectional view of the vicinity of the stopper shown in FIG. 4 after the stopper has been removed from the tip of the hook. [Figure 7] Cross-sectional view taken along line VII-VII in Figure 6. [Figure 8] FIG. 7 is a diagram showing a state in which the knob of the stopper shown in FIG. 6 is pulled in a direction away from the hook base to cause elastic deformation, and the stopper is hooked onto the hook tip. [Figure 9] A diagram showing an example of how the scaffolding suspension chain shown in FIG. 1 is used. [Figure 10] FIG. 8 is a diagram showing a modified example of the stopper shown in FIG. 7. [Figure 11] FIG. 8 is a diagram showing another modified example of the stopper shown in FIG. 7. [Figure 12] FIG. 2 shows a second embodiment of the present invention. [Figure 13] FIG. 4 shows a second embodiment of the present invention, corresponding to FIG. 3. [Figure 14] FIG. 5 is a diagram showing a second embodiment of the present invention corresponding to FIG. [Figure 15] Cross-sectional view taken along line XV-XV in Figure 14. [Figure 16] FIG. 3 is a diagram showing a third embodiment of the present invention, corresponding to FIG. 2. [Figure 17] FIG. 4 is a diagram showing a third embodiment of the present invention, corresponding to FIG. [Figure 18] FIG. 5 is a diagram showing a third embodiment of the present invention, corresponding to FIG. [Figure 19] A cross-sectional view taken along line XIX-XIX in FIG. 16. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] A scaffolding suspension chain according to a first embodiment of the present invention is shown in Figure 1. This scaffolding suspension chain has a chain 2 made up of multiple links 1 connected in series, hooks 3 provided on both ends of the chain 2, and stoppers 4 attached to each hook 3.

[0029] Each link 1 of the chain 2 is an annular member formed by bending a steel wire into a C-shape and welding both ends of the wire. The thickness of the wire constituting the link 1 is set to be in the range of 5 mm to 7 mm.

[0030] The hook 3 and the stopper 4 provided at one end of the chain 2 have the same configuration as the hook 3 and the stopper 4 provided at the other end of the chain 2. Therefore, hereinafter, the hook 3 and the stopper 4 provided at one end of the chain 2 will be described, and the hook 3 and the stopper 4 provided at the other end of the chain 2 will be given the same reference numerals and description thereof will be omitted.

[0031] 2, the hook 3 is formed of a flat steel plate. The thickness of the steel plate constituting the hook 3 is set in the range of 4.0 mm to 6.0 mm.

[0032] As shown in Figure 4, hook 3 has hook base 5 to which link 1b at one end of chain 2 is connected, and hook tip 6 to be hooked onto link 1a (see Figure 9) in the middle of chain 2. A link accommodating groove 7 that is open at the top and closed at the bottom is formed between hook base 5 and hook tip 6. Link accommodating groove 7 is a U-shaped notched groove that accommodates link 1a when hook tip 6 is hooked onto link 1a in the middle of chain 2, as shown in Figure 9.

[0033] As shown in Fig. 4, the hook base 5 and hook tip 6 are disposed opposite each other with the link accommodating groove 7 between them. The hook base 5 is a portion that extends downward from the position where the link 1b at one end of the chain 2 is connected to a position corresponding to the lower end of the link accommodating groove 7, and the hook tip 6 is a portion that folds back at the position corresponding to the lower end of the link accommodating groove 7 and extends upward. The hook base 5 is formed with a link attachment hole 8 through which the link 1b at one end of the chain 2 is inserted and attached. The link attachment hole 8 is a circular through hole that penetrates the hook base 5 in the plate thickness direction.

[0034] 3, the stopper 4 is an annular member made of rubber or elastomer. It is preferable to use a rubber or elastomer that has high weather resistance as the rubber or elastomer that constitutes the stopper 4, and examples of such rubber or elastomer that can be used include ethylene propylene rubber (EPDM), silicone rubber, fluororubber, olefin-based elastomer, and polyester-based elastomer.

[0035] As shown in Fig. 4, the loss prevention device 4 has an annular part 9 that is wrapped in an elastically stretched state between an edge of the hook tip part 6 on the opposite side to the link receiving groove 7 (left side in the figure) and an edge of the hook base part 5 on the opposite side to the link receiving groove 7 (right side in the figure), and a knob part 10 that is formed integrally with the annular part 9. When wrapped around the hook tip part 6 and the hook base part 5, the annular part 9 closes the opening at the upper end of the link receiving groove 7 to prevent the link 1a from coming off from the link receiving groove 7. As shown in Fig. 5, the knob part 10 is formed to extend in a direction away from the hook base part 5 (leftward in the figure) from a portion of the annular part 9 that is hung on the hook tip part 6 of the loss prevention device 4.

[0036] 3, the knob portion 10 is formed in a sheet shape with its thickness direction being in the up-down direction, and the annular portion 9 is also formed in a sheet shape integral with the knob portion 10. This stopper 4 can be formed by punching a sheet material made of rubber or elastomer.

[0037] 6, a retaining portion 11 for retaining the fall-off stopper 4 is provided on the edge of the hook base 5 opposite the link accommodating groove 7 (the right side in the figure). The retaining portion 11 is a notch formed so as to enter the inside of the hook base 5 from the edge of the hook base 5 opposite the link accommodating groove 7 (the right side in the figure). In this embodiment, the retaining portion 11 is a U-shaped notch having a pair of opposing surfaces that face each other vertically with a portion of the fall-off stopper 4 that is hung on the hook base 5, and a bottom surface that connects the pair of opposing surfaces.

[0038] 7, the removal stopper 4, in its natural state without elastic deformation, has an elongated inner peripheral shape in a direction perpendicular to the plate thickness direction of the hook 3 (left-right direction in the figure). Here, the elongated inner peripheral shape of the removal stopper 4 is tapered so that the width gradually increases from the hook base 5 side to the hook tip 6 side, such that the inner width of the end 4a on the hook tip 6 side of the inner circumference of the removal stopper 4 (left side in the figure) is wider than the inner width of the end 4b on the hook base 5 side of the inner circumference of the removal stopper 4 (right side in the figure).

[0039] As shown in FIG. 4, a locking protrusion 15 that restricts the upward movement of the stopper 4 is formed on the edge of the hook tip portion 6 opposite the link accommodating groove 7 (the left side in the figure).

[0040] An example of the use of this scaffolding suspension chain will be described. As shown in FIG. 9, the chain 2 is wound around a structure B such as a beam, and the hook 3 at the top end of the chain 2 is hooked to the link 1a at the middle part of the chain 2, so that the chain 2 is in a state of hanging down from the structure B. After that, the hook 3 at the bottom end of the chain 2 is hooked to the link 1a at the middle part of the chain 2 to form a loop L, and the loop L supports the scaffolding S. Here, after the hook 3 is hooked to the link 1a at the middle part of the chain 2, as shown in FIG. 8, the knob part 10 of the removal stopper 4 is pulled in a direction away from the hook base part 5, and the annular part 9 of the removal stopper 4 is hooked to the hook tip part 6. As a result, as shown in FIG. 4, the opening at the upper end of the link receiving groove 7 is closed by the removal stopper 4, so that the hook 3 can be prevented from being removed from the chain 2. Here, an example of using the scaffolding suspension chain in so-called single suspension has been described, but the same applies when it is used in so-called loop suspension.

[0041] As shown in Figure 3, this scaffolding suspension chain has anti-detachment device 4 made of rubber or elastomer, so when an external force is applied to anti-detachment device 4, it only undergoes elastic deformation, and does not undergo plastic deformation. Therefore, even if the scaffolding suspension chain is roughly handled on-site and receives an impact by hitting another chain, etc., anti-detachment device 4 can be prevented from being damaged.

[0042] In addition, as shown in Figures 4 and 5, in this scaffolding suspension chain, the stopper 4 is an annular member that is elastically stretched and wound around the hook tip 6 and the hook base 5, so the stopper 4 can be easily replaced. Therefore, by preparing spare stopper 4, even if the stopper 4 is damaged on-site, it is possible to replace it with a new stopper 4 and continue to use the scaffolding suspension chain as is.

[0043] Furthermore, as shown in FIG. 6, when the anti-detachment device 4 is removed from the hook tip 6, the portion of the anti-detachment device 4 that is hung on the hook base 5 is held by the holding portion 11, making it easy to subsequently hang the anti-detachment device 4 on the hook tip 6 again.

[0044] In addition, as shown in Figure 5, this scaffolding suspension chain has a knob portion 10 that extends away from the hook base 5 at the portion that is hung on the hook tip 6 of the anti-detachment device 4.Therefore, as shown in Figure 8, a worker can grasp the knob portion 10 with his or her hand and pull it in a direction away from the hook base 5, thereby elastically stretching the anti-detachment device 4, making it easy to hook the anti-detachment device 4 onto or remove it from the hook tip 6.

[0045] In addition, as shown in Fig. 7, when the stopper 4 is removed from the hook tip 6 and elastically restored to its natural state, the stopper 4 has an elongated inner peripheral shape in a direction perpendicular to the plate thickness direction of the hook 3, so that the stopper 4 can be prevented from slipping around the hook base 5 and the position of the knob 10 is stable. Therefore, as shown in Fig. 8, it is easy to grip the knob 10 when hooking the stopper 4 back onto the hook tip 6.

[0046] Furthermore, when this scaffolding suspension chain has the anti-detachment device 4 removed from the hook tip 6 and elastically restored to its natural state, as shown in Figure 7, the inner width of the end 4a on the inner circumference of the anti-detachment device 4 near the hook tip 6 (left side in the figure) is wider than the inner width of the end 4b on the inner circumference of the anti-detachment device 4 near the hook base 5 (right side in the figure), making it easy to hang the anti-detachment device 4 on the hook tip 6, as shown in Figure 8.

[0047] Furthermore, as shown in Figure 4, this scaffolding suspension chain has a locking protrusion 15 formed on the edge of the hook tip 6 opposite the link accommodating groove 7 (the left side in the figure) to restrict the upward movement of the anti-detachment device 4. Therefore, after the anti-detachment device 4 is hung on the hook tip 6, it can effectively prevent the anti-detachment device 4 from coming off the hook tip 6 even if some external force is applied to the anti-detachment device 4.

[0048] Furthermore, as shown in Figure 2, this scaffolding suspension chain has a retaining portion 11 which is a notch formed so as to extend into the interior of hook base 5 from the edge of hook base 5 opposite link accommodating groove 7 (the right side in the figure), so that retaining portion 11 can be easily formed by press processing or the like, making it low cost.

[0049] Furthermore, as shown in Figure 3, this scaffolding suspension chain has anti-detachment device 4 formed of rubber or elastomer rather than metal. Therefore, when attached to hook 3 as shown in Figure 4, anti-detachment device 4 has better visibility than when a metal anti-detachment device 4 is used, making it easier to visually check whether anti-detachment device 4 is attached to hook tip 6.

[0050] FIG. 10 shows a modified example of the stopper 4. The stopper 4 shown in FIG. 10 has an inner circumferential shape that is elongated in a direction perpendicular to the plate thickness direction of the hook 3 (see FIG. 7) (left and right direction in the figure) when in a natural state without elastic deformation. The end 4b on the hook base 5 side of the inner periphery of the stopper 4 shown in FIG. 10 (right side in the figure) has a parallel shape with a constant inner width. The inner width of the end 4b on the hook base 5 side of the inner periphery of the stopper 4 shown in FIG. 10 (right side in the figure) is set smaller than the plate thickness of the steel plate constituting the hook 3 shown in FIG. 7, so that the hook 3 can be elastically clamped by the end 4b on the hook base 5 side of the inner periphery of the stopper 4 (right side in the figure). On the other hand, the inner width of the end 4a on the hook tip 6 side (left side in the figure) of the inner circumference of the removal stopper 4 shown in Fig. 10 is set to be wider than the inner width of the end 4b on the hook base 5 side (right side in the figure) of the inner circumference of the removal stopper 4, and is set to be larger than the plate thickness of the steel plate constituting the hook 3 shown in Fig. 7. Between the end 4a on the hook tip 6 side (left side in the figure) of the inner circumference of the removal stopper 4 and the end 4b on the hook base 5 side (right side in the figure) of the inner circumference of the removal stopper 4, an intermediate portion 4c is formed whose inner width gradually becomes wider from the hook base 5 side (right side in the figure) to the hook tip 6 side (left side in the figure). When the removal stopper 4 of this modification is used, the same action and effect as when the removal stopper 4 shown in Fig. 7 is used can be obtained.

[0051] FIG. 11 shows another modified example of the removal stopper 4. The removal stopper 4 shown in FIG. 11 also has an elongated inner periphery shape in a direction perpendicular to the plate thickness direction of the hook 3 (see FIG. 7) (left and right direction in the figure) when in a natural state without elastic deformation. The inner width of the end 4a on the hook tip 6 side (left side in the figure) of the inner periphery of the removal stopper 4 shown in FIG. 11 is wider than the inner width of the end 4b on the hook base 5 side (right side in the figure) of the inner periphery of the removal stopper 4. In addition, an inward protrusion 4d is formed on the inner periphery of the removal stopper 4 at a position corresponding to the link receiving groove 7 in a natural state without elastic deformation. The inner width at the protrusion 4d of the removal stopper 4 (i.e., the distance between the tips of the protrusions 4d) is set smaller than the plate thickness of the steel plate constituting the hook 3 shown in FIG. 7. When the removal stopper 4 of this modified example is used, the same action and effect as when the removal stopper 4 shown in FIG. 7 is used can be obtained.

[0052] 12 to 15 show a second embodiment of the present invention. The second embodiment differs from the first embodiment only in the configuration of the holding portion 11, and the other configurations are the same as those of the first embodiment. Therefore, the parts corresponding to the first embodiment are given the same reference numerals and the description thereof will be omitted.

[0053] As shown in Fig. 12, a retaining portion 11 for retaining the fall-off stopper 4 (see Fig. 13) is provided on the edge of the hook base 5 on the opposite side to the link accommodating groove 7 (the right side in the figure). The retaining portion 11 is a notch formed so as to enter the inside of the hook base 5 from the edge of the hook base 5 on the opposite side to the link accommodating groove 7 (the right side in the figure). As shown in Fig. 14, the retaining portion 11 is formed in an L-shape consisting of a first portion 12 that opens on the edge of the hook base 5 on the opposite side to the link accommodating groove 7 (the right side in the figure) and a second portion 13 that extends upward from the first portion 12.

[0054] The retaining portion 11 is provided with a narrow portion 14. When the removal stopper 4 is in its natural state without elastic deformation, the narrow portion 14 restricts the passage of the removal stopper 4 by forming a passage narrower than the cross-sectional shape of the removal stopper 4, thereby preventing the removal stopper 4 from slipping out of the retaining portion 11. The narrow portion 14 has a width dimension that allows the removal stopper 4 to pass by elastically deforming the removal stopper 4 so that its cross-sectional shape becomes smaller.

[0055] Like the first embodiment, the scaffolding suspension chain of the second embodiment also has the stopper 4 made of rubber or elastomer as shown in Fig. 13, so when an external force is applied to the stopper 4, the stopper 4 only elastically deforms and does not plastically deform. Therefore, even if the scaffolding suspension chain is roughly handled on-site and receives an impact by hitting another chain, the stopper 4 can be prevented from being damaged.

[0056] 14 and 15, in this scaffolding suspension chain, the stopper 4 is an annular member that is elastically stretched and wound around the hook tip 6 and the hook base 5, so that the stopper 4 can be easily replaced. Therefore, by preparing spare stopper 4, even if the stopper 4 is damaged on-site, it is possible to replace it with a new stopper 4 and continue to use the scaffolding suspension chain as is.

[0057] In addition, when the removal stopper 4 is removed from the hook tip 6, the part of the removal stopper 4 hung on the hook base 5 is held by the holding part 11, so that it is easy to hang the removal stopper 4 on the hook tip 6 again afterwards.

[0058] In addition, as shown in Fig. 14, this scaffolding suspension chain has a narrowed portion 14 in the holding portion 11, so that the stopper 4 will not come off the holding portion 11 unless the stopper 4 is elastically deformed so that its cross-sectional shape becomes smaller. Therefore, when the stopper 4 is removed from the hook tip portion 6 and elastically restored to its natural state, it is possible for the stopper 4 to be securely held in the holding portion 11. Other effects and advantages are the same as those of the first embodiment.

[0059] 16 to 19 show a third embodiment of the present invention. The third embodiment differs from the first embodiment only in the configurations of the stopper 4 and the holding portion 11, and the other configurations are the same as those of the first embodiment. Therefore, the parts corresponding to the first embodiment are given the same reference numerals and the description thereof will be omitted.

[0060] 17 and 19, the annular portion 9 of the fall-stopper 4 is formed in a cylindrical shape that fits around the outer periphery of the hook base 5, and the knob portion 10 is formed in a sheet shape with its thickness direction parallel to the plate thickness direction of the hook 3. This fall-stopper 4 can be formed by bending a strip-shaped sheet material made of rubber or elastomer into a cylindrical shape and gluing both ends together. It may also be formed by press-molding or die-cutting the rubber or elastomer.

[0061] 16 and 18, in this embodiment, the retaining portion 11 is a notch formed so as to enter the inside of the hook base 5 from the edge of the hook base 5 on the side opposite to the link accommodating groove 7 (the right side in the figures). The notch is formed in a T-shape consisting of a first portion 16 that opens to the edge of the hook base 5 on the side opposite to the link accommodating groove 7 (the right side in the figures), and a second portion 17 that extends vertically from the first portion 16. The vertical width of the first portion 16 is smaller than the vertical width of the removal stopper 4, and the vertical width of the second portion 17 is larger than the vertical width of the removal stopper 4.

[0062] Here, the first portion 16 constitutes a narrow portion that restricts the passage of the anti-detachment device 4 when the anti-detachment device 4 is in its natural state without elastic deformation, and allows the anti-detachment device 4 to pass by elastically deforming the anti-detachment device 4 so that its cross-sectional shape becomes smaller.

[0063] Like the first embodiment, the scaffolding suspension chain of the third embodiment also has the stopper 4 made of rubber or elastomer as shown in Fig. 17, so when an external force is applied to the stopper 4, the stopper 4 only elastically deforms and does not plastically deform. Therefore, even if the scaffolding suspension chain is roughly handled on-site and receives an impact by hitting another chain, the stopper 4 can be prevented from being damaged.

[0064] 18 and 19, in this scaffolding suspension chain, the stopper 4 is an annular member that is elastically stretched and wound around the hook tip 6 and the hook base 5, so that the stopper 4 can be easily replaced. Therefore, by preparing spare stopper 4, even if the stopper 4 is damaged on-site, it is possible to replace it with a new stopper 4 and continue to use the scaffolding suspension chain as is.

[0065] In addition, when the removal stopper 4 is removed from the hook tip 6, the part of the removal stopper 4 hung on the hook base 5 is held by the holding part 11, so that it is easy to hang the removal stopper 4 on the hook tip 6 again afterwards.

[0066] In addition, as shown in Fig. 18, this scaffolding suspension chain has a first portion 16 (narrow portion) provided in the holding portion 11, so that the stopper 4 will not come off the holding portion 11 unless the stopper 4 is elastically deformed so that its cross-sectional shape becomes smaller. Therefore, when the stopper 4 is removed from the hook tip portion 6 and elastically restored to its natural state, it is possible for the stopper 4 to be securely held in the holding portion 11. Other effects and advantages are also similar to those of the first embodiment. [Explanation of symbols]

[0067] 1, 1a Link 2. Chain 3. Hook 4 Stopper 4a End of the inner circumference of the stopper near the tip of the hook 4b End of the inner circumference of the stopper near the hook base 5 Hook base 6 Hook tip 7 Link receiving groove 10 Knob 11 Holding part 14 Narrow area 15 Locking protrusion 16 First section (narrow section)

Claims

1. A chain (2) consisting of a plurality of circular links (1) connected in series; a hook (3) having a hook base (5) to which one end of the chain (2) is connected and a hook tip (6) to be hooked onto a link (1a) in the middle of the chain (2), a link receiving groove (7) having an open upper end and a closed lower end is formed between the hook base (5) and the hook tip (6), and when the hook tip (6) is hooked onto the link (1a), the link (1a) is received in the link receiving groove (7); and a stopper (4) for closing an opening at an upper end of the link receiving groove (7) to prevent the link (1a) from coming off the link receiving groove (7). The stopper (4) is made of rubber or elastomer, The stopper (4) is an annular member that is wrapped around, in an elastically stretched state, an edge of the hook tip portion (6) on the opposite side to the link receiving groove (7) and an edge of the hook base portion (5) on the opposite side to the link receiving groove (7); A scaffolding suspension chain characterized in that a retaining portion (11) for retaining the anti-slip device (4) is provided on the edge of the hook base (5) opposite the link accommodating groove (7).

2. 2. A scaffolding suspension chain as described in claim 1, wherein a knob portion (10) extending in a direction away from the hook base portion (5) is provided at the portion of the hook stopper (4) that is hooked onto the hook tip portion (6).

3. The hook (3) is made of a steel plate, 3. A scaffolding suspension chain as described in claim 2, wherein the anti-slip device (4) has an elongated inner peripheral shape in a direction perpendicular to the thickness direction of the hook (3) when in a natural state without elastic deformation.

4. 4. A scaffolding suspension chain as described in claim 3, wherein the anti-detachment device (4) is formed so that, when in its natural state and not elastically deformed, the inner width of the end (4a) of the inner circumference of the anti-detachment device (4) on the side of the hook tip portion (6) is wider than the inner width of the end (4b) of the inner circumference of the anti-detachment device (4) on the side of the hook base portion (5).

5. A scaffolding suspension chain as described in any one of claims 1 to 4, wherein a locking protrusion (15) for restricting upward movement of the anti-slip device (4) is formed on the edge of the hook tip portion (6) opposite the link accommodating groove (7).

6. 5. A scaffolding suspension chain as described in any one of claims 1 to 4, wherein the retaining portion (11) is a notch formed so as to extend into the interior of the hook base (5) from the edge of the hook base (5) opposite the side of the link accommodating groove (7).

7. 7. A scaffolding suspension chain as described in claim 6, wherein the retaining portion (11) has a narrow portion (14, 16) that restricts the passage of the anti-detachment device (4) when the anti-detachment device (4) is in its natural state without elastic deformation, and allows the passage of the anti-detachment device (4) by elastically deforming the anti-detachment device (4) so ​​that its cross-sectional shape becomes smaller.

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