Temporary scaffolding treads

Abstract

Provide a step with a locking device for securing. [Solution] The tread Fp has a hook body 2 with a hook portion 2a that performs a locking function, which is attached to the bracket body 1 via a compression spring 4 so that it can be freely advanced and retracted. The advanced position of the hook portion 2a is maintained by the spring force of the spring 4 as it expands, and the retracted position where the spring 4 is compressed is maintained by fitting the support shaft 3 into the locking grooves 11e and 11f.

Description

[Technical Field]

[0001] This invention relates to a step board provided on a temporary scaffold for walking or working, and relates to a step board equipped with a fixing locking device. [Background technology]

[0002] At construction sites such as building construction sites and demolition sites for buildings, various types of scaffolding, such as wedge-tightened scaffolding, frame scaffolding, or next-generation scaffolding, are assembled and installed around the site, and work treads (hereinafter simply referred to as "treads") that can also be used for walking are placed at each unit height.

[0003] Typical treads come in about three widths: 250 mm, 400 mm, and 500 mm, and lengths vary widely, including 1800 mm, 1200 mm, 900 mm, 600 mm, and 410 mm.

[0004] Even with these various sizes of treads, in order to place the treads on the scaffolding, hook-shaped fastening members are provided at both ends of the length to hook them onto scaffolding components (for example, horizontal single pipes) and maintain them in that position.

[0005] The hook-shaped hanging members for installation that existing treads are equipped with are hanging fittings that are, for example, semicircular arc-shaped, facing horizontally, at the front and back of the tread (both ends in the longitudinal direction).By placing these hanging fittings over the single pipe of the scaffolding material from above, the tread can be placed on the scaffolding (see Patent Documents 1 to 4).

[0006] However, if the step is simply placed by engaging it with the horizontal single pipe of the scaffolding in the above-mentioned manner, there is a risk that if an external force acts on the step from below, the step will lift up and come off the scaffolding and fall.

[0007] Incidentally, some conventional treads have hook-shaped fastenings equipped with locking claws, but this locking method does not solve the problems of existing treads that have fastenings that do not have claws. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-159236 [Patent Document 2] Japanese Patent Application Laid-Open No. 2008-50939 [Patent Document 3] Japanese Patent Application Laid-Open No. 2010-159573 [Patent Document 4] Japanese Patent Publication No. 2023-57183 Summary of the Invention [Problem to be solved by the invention]

[0009] The object of this invention is to provide a step with a locking device that can be retrofitted to conventional step boards that do not have locking claws, while also having a structure that can be applied to new step boards. [Means for solving the problem]

[0010] The configuration of a step board equipped with a locking device for fixing, which was made to solve the above problems, is a bracket comprising a bracket body that is elongated and approximately U-shaped in a horizontal plane view, and left and right mounting pieces that are wing-shaped by extending the left and right side walls of the bracket body into the opening of the bracket body and bending them outward at approximately 90 degrees, guide grooves that are provided horizontally on the left and right side walls of the bracket body with hook-shaped ends, and a hook portion that is approximately L-shaped at the tip when viewed from the side, and the rear end side of this hook portion is formed in a straight line via a spring stop step portion, and the rear end is inserted through a hole provided in the bottom of the bracket body. The scaffolding is characterized by a protruding hook body, a support shaft provided in the middle of the hook body (near the spring stop step) and oriented perpendicular to the longitudinal direction of the hook body, the support part of the hook body having the support shaft slidably inserted into the guide groove, and a compression spring fitted onto the linear part of the hook body, with both ends of the spring supported by the spring stop step of the hook body and the bottom of the bracket, and a fixing locking device for fixing the spring is fixed to the backside of a tread placed on the temporary scaffolding, on the inner surface of the standing wall at both ends in the longitudinal direction of the tread, by the mounting pieces of the bracket. At least two locking devices are preferably attached to one standing wall, but even one locking device is sufficient to prevent the tread from coming off the scaffolding. [Effects of the Invention]

[0011] The tread of this invention can be placed on a temporary scaffold and prevented from falling off the scaffold due to external forces or vibrations that act upward from below, by using a locking device installed on the tread.

[0012] The locking device of this invention can be retrofitted to existing treads that do not have a locking device, and the locking device can be installed as an original part on newly manufactured treads. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 2 is a perspective view of the locking device installed on the footboard of the present invention, seen from diagonally behind. [Figure 2]FIG. 2 is a front view of the locking device of FIG. 1; [Figure 3] FIG. 3 is a plan view of the locking device of FIG. 2; [Figure 4] AA cross-sectional view of FIG. 3. [Figure 5] FIG. 3 is a right side view of the locking device of FIG. 2; [Figure 6] FIG. 3 is a left side view of the locking device of FIG. 2; [Figure 7] 7 is a bottom view showing the main part of the step plate to which the locking device shown in FIGS. 1 to 6 is attached. FIG. [Figure 8] FIG. 2 is a cross-sectional view showing the state before the locking operation of the locking device on the footboard of the present invention. [Figure 9] 9 is a cross-sectional view showing the locking device of FIG. 8 in a locked state. DETAILED DESCRIPTION OF THE INVENTION

[0014] Next, an embodiment of the tread having a locking device according to the present invention will be described with reference to the drawings.

[0015] In the locking device LS attached to the tread of the present invention shown in Figures 1 to 6, reference numeral 1 denotes a bracket body 1 having a generally U-shaped, elongated shape when viewed horizontally. The opening side of this body 1 (the right side in Figures 1 and 3) is provided with wing-like left and right mounting pieces 1a and 1b formed by bending the left and right side walls of this body 1 outward by 90 degrees. The bracket body 1 and mounting pieces 1a and 1b form a bracket 1A. The left and right mounting pieces 1a and 1b are provided with pin holes Ph for fastening the locking device LS to the inside of the front and rear end faces of the tread Fp with screws or crimping pins.

[0016] The bracket 1A has horizontal guide grooves 1e and 1f in the middle of the left and right side walls 1c and 1d. The guide grooves 1e and 1f have hook-shaped locking grooves 11e and 11f at their ends (on the left side of the figure).

[0017] In Figures 1 to 6, 2 is a hook body whose tip end is formed into a hook portion 2a that is approximately V-shaped when viewed from the side, and which passes through a step portion 2b for retaining a spring in the middle and is formed into a spring support portion 2c that is thinner than the hook portion 2a towards the rear end.

[0018] In the hook body 2, the rear end side of the spring support portion 2c is adjusted to a length that projects from a bottom hole 11g formed in the bottom wall 1g of the bracket main body 1.

[0019] The hook body 2 has a support shaft 3 at its middle (closer to the hook part 2a than the step part 2b for spring stop) that is perpendicular to the longitudinal direction of the hook body 2, and both ends of this shaft 3 are slidably mounted in guide grooves 1e, 1f formed in the side walls 1c, 1d of the bracket body 1.

[0020] Reference numeral 4 denotes a coil-shaped compression spring fitted onto the spring support portion 2c of the hook body 2, and this spring 4 is supported by the spring support portion 2c in a stretchable state between the step portion 2b and the bottom wall 1g. A hole 21c is provided at the rear end of the spring support portion 2c for passing an operating ring Ar therethrough.

[0021] The above constitutes an example of the locking device LS provided on the tread Fp of the present invention.

[0022] In the locking device LS, when the hook body 2 is pulled backward (to the left in Figures 1 and 4) against the spring force of the spring 4 and the support shaft 3 of the hook body 2 is dropped into the locking grooves 11e, 11f of the guide grooves 1e, 1f, the spring 4 is compressed and the hook body 2 is held in a retracted, immovable (fixed) unused state (a state in which it does not function as a locking device).

[0023] To release the unused state, the rear end of the spring support portion 2c is lifted up within the hole 11g and the support shaft 3 is released from the locking grooves 11e and 11f. The extension action of the compressed spring 4 pushes the hook body 2 forward (to the right in Figures 1 and 4), and the hook portion 2a is positioned in a forward-locking state (the state in Figures 1 and 4).

[0024] Therefore, in this invention, when the locking device LS is not in use and the hook body 2 is held in the retracted position, a crimping pin or locking screw is inserted into the pin hole Ph of the mounting pieces 1a, 1b, and the locking device LS is installed by fixing the pin or screw to the front and rear end walls on the back surface of the tread Fp (see Figure 8).

[0025] In Fig. 8, Vw is a vertical wall at the front end of the tread Fp, and the locking device LS is fixed to the inner surface of this wall Vw by pins or screws (not shown) at the mounting pieces 1a and 1b. In Fig. 8, P is a horizontal single pipe of the temporary scaffolding, and F is a locking hook that is originally equipped on the tread Fp.

[0026] When the locking device LS is in an unused state as shown in Figure 8, when the spring support portion 2c of the hook body 2 is slightly lifted to release the support shaft 3 of the hook body 2 from the locking grooves 11e, 11f, the extension force of the spring 4 causes the support shaft 3 to move forward (to the right in the figure) along the guide grooves 1e, 1f, and the hook portion 2a of the hook body 2 advances in a direction away from the vertical wall Vw of the tread Fp, and the upper surface (outer surface) of the tip side of the advanced hook portion 2a abuts against the side surface of the lower half of the single pipe P (see Figure 9).

[0027] When the hook portion 2a advances to the state shown in Figure 9, the single pipe P is sandwiched from both the top and bottom by the original hook F and the hook portion 2a, so in this state the tread Fp cannot detach from the single pipe P of the scaffolding.

[0028] The tread Fp, locked in the state shown in Figure 9 by the hook F and hook portion 2a, cannot be removed from the scaffolding. To remove it, pull the spring support portion 2c of the locking device LS backward against the spring force of the spring 4, causing the support shaft 3 to drop into the locking grooves 11e and 11f; in other words, when the state shown in Figure 8 is reached, the tread Fp is simply resting on the single pipe P by the hook F, so it can be easily removed from the scaffolding.

[0029] The locking device LS of this invention is attached to the inside of the upright wall Vw at the front and rear end faces of the tread Fp by caulking a pin (not shown) or by fastening with a screw (not shown) in the pin holes Ph provided in the mounting pieces 1a, 1b of the locking device LS.

[0030] Therefore, by retrofitting this locking device to the upright wall Vw of an existing step Fp that has only a hook F without a locking device LS, it can be modified to have a step Fp with a locking device LS.

[0031] Furthermore, when manufacturing a new tread Fp, the locking device described above can be placed inside the upright walls Vw at the front and rear ends of the tread Fp to form a tread Fp with a locking device LS. Note that the tread Fp to which the locking device LS can be attached is not limited to the illustrated example, but includes all types of treads Fp installed on temporary scaffolding for walking or working.

[0032] Since the treads of this invention for temporary scaffolding are as described above, they will not come off the scaffolding due to external forces, vibrations, etc. while in use, and are therefore extremely useful as treads for temporary scaffolding. [Explanation of symbols]

[0033] 1A Bracket 1 Bracket body 1a, 1b Mounting piece 1c, 1d Left and right side walls 1e, 1f Guide groove 11e,11f Locking groove 1g standing wall (bottom) Ph Pin holes for mounting pieces 1a and 1b 2 Hook body 2a Hook part 2b Stepped part for spring stop 2c Spring support part 3 Support shaft 4 springs LS locking device Fp treadle Vw Standing walls at the front and rear ends of the footboard P Horizontal single pipe for scaffolding

Claims

1. A bracket comprising a slender, generally U-shaped bracket body oriented horizontally in a plan view, and left and right wing-shaped mounting pieces formed by extending the left and right side walls of the bracket body and bending them outward at approximately 90 degrees at an opening of the bracket body; guide grooves with hook-shaped ends provided horizontally on the left and right side walls of the bracket body; a hook body having a hook portion with a generally V-shaped tip when viewed from the side, and a rear end portion of the hook portion formed in a straight line via a spring stop step portion, the rear end of which protrudes from a hole provided in the bottom of the bracket body; a support shaft provided in the middle portion of the hook body (near the spring stop step portion) in a direction perpendicular to the length direction of the hook body, and a support portion for the hook body in which the support shaft is slidably inserted into the guide groove; a compression spring fitted onto the linear portion of the hook body, with both ends of the spring supported by the spring stopper step of the hook body and the bottom of the bracket; A tread for temporary scaffolding, characterized in that a locking device for fixing the tread, comprising: a locking device for fixing the locking device, is fixed to the back surface of the tread to be placed on the temporary scaffolding, and to the inner surface of the standing wall on both ends of the tread in the longitudinal direction, by the mounting pieces of the bracket.

2. 2. A step for temporary scaffolding according to claim 1, wherein at least two of said locking devices are disposed on the inner surfaces of the upright walls at both front and rear ends of said step.

3. 3. A tread for temporary scaffolding according to claim 1 or 2, wherein the locking device is fixed to the inner surface of the standing wall by pinning or screwing the mounting piece of the bracket.

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