Net bracket

Abstract

To provide a net bracket that is light, prevents tilting when worn, and is excellent in operability and durability.SOLUTION: A net bracket has a clamp metal fitting C fixed to a scaffolding pipe P. A fixing tool 10 having a U-shape in plan view and connected to the clamp metal fitting C is provided. An extendable arm member 20 swingably connected to the fixing tool 10 is provided. The fixing tool 10 is provided with a fixing plate 11 screwed to a side surface of the clamp metal fitting C. The fixing tool 10 is provided with a pair of left and right connecting plates 12 sandwiching the arm member 20 for connection. A rotation stopper 11A is provided at a connecting portion between a plate surface of the fixing plate 11 and the side surface of the clamp metal fitting C.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a net bracket used when installing a safety net on temporary scaffolding. [Background technology]

[0002] At temporary construction sites, safety measures have been taken to install safety nets using net brackets in the gaps that occur between temporary scaffolding and buildings. This net bracket is designed to install a safety net by horizontally fixing an arm member made of a flexible pipe via a clamp that connects to the scaffolding pipe. This arm member extends horizontally when in use, and when not in use, the tip of the arm member is raised and held in a retracted state by the clamp.

[0003] The net bracket described in Patent Document 1 has a flat U-shaped frame body 2 that is fixed with clamping metal fittings along a scaffolding pipe 8, and a stopper bolt 16 that passes horizontally through this frame body 2. Furthermore, a slide bolt 14 is connected to the base end of an arm member 3, and the arm member 3 is connected to the frame body 2 so that it can swing freely.

[0004] When in use, the arm member 3 is placed horizontally on the stopper bolt 16. On the other hand, when not in use, the slide bolt 14 is slid into the guide slit 11 formed on the side of the frame body 2 to hold the arm member 3 upright.

[0005] The net bracket described in Patent Document 2 is provided with a flat U-shaped arm attachment section 21 that is fixed to a scaffolding pipe with a clamp metal fitting, and has a rotating shaft 42 connected to the base end of an arm member. When in use, the arm member is placed approximately horizontally on an arm support 24 that passes horizontally through the arm attachment section 21. When not in use, on the other hand, the rotating shaft 42 is slid along various guides 31, 32, 35 formed on the plate surface of the arm attachment section 21, and the rotating shaft 42 is engaged with the guide rotating shaft holder 36, thereby holding the arm member upright. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Utility Model Application Publication No. 3-115764 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-58207 Summary of the Invention [Problem to be solved by the invention]

[0007] These conventional net brackets had the following three problems. The first problem was that the net brackets were as heavy as wall-connecting brackets, which are reinforcing brackets that connect the scaffolding pipes to the wall in order to strengthen the scaffolding structure.

[0008] In other words, to firmly secure the wall-connecting bracket to the scaffolding pipe, a reinforcing member was provided below the clamping metal fitting of the wall-connecting bracket to abut the side of the scaffolding pipe, making it a sturdy structure with a reasonable weight.The tip of this bracket was equipped with an arm member made of a flexible pipe, and a connecting metal fitting attached to the tip of this arm member was used to secure it to the wall of the building.

[0009] Conventional net brackets utilize the same structure as wall-connecting brackets, and therefore have the same structure as wall-connecting brackets, including a structure for fixing an arm member made of an extendable pipe to a clamp fitting, and a structure in which a reinforcing member is provided below the clamp fitting to abut against the side of the scaffolding pipe.

[0010] However, the purpose of installing net brackets is to install the safety net horizontally. Therefore, it is desirable to fix the net brackets so that they do not tilt. However, conventional net brackets, like wall-connecting brackets, prevent tilting by providing reinforcing members that abut against the sides of the scaffolding pipes, so the weight of the net brackets is almost the same as the weight of the wall-connecting brackets.

[0011] Furthermore, since net brackets are used much more frequently than wall-tie brackets, their weight causes delays in the installation of net brackets. As such, since net brackets are as heavy as wall-tie brackets, lightweight net brackets are desired.

[0012] Furthermore, the use of reinforcement materials in conventional net brackets has the disadvantage of making them incompatible with new types of scaffolding. Specifically, scaffolding such as wedge scaffolding and next-generation scaffolding has wedge fastenings and flanges on the scaffolding pipe. Therefore, if reinforcement materials that abut the scaffolding pipe below the clamping hardware are used, these wedge fastenings and flanges may interfere with their use.

[0013] The second problem is that it takes a lot of effort to fix the arm member in an upright position when not in use. For example, the net brackets in Patent Documents 1 and 2 state that in order to fix the arm member in the frame body 2 or the arm attachment part 21 when not in use, the slide bolt 14 provided at the base end of the arm member 3 and the bolts and nuts that make up the rotation shaft 42 are tightened to fix it.

[0014] In this way, if the work of tightening bolts and nuts is added to the work of erecting arm members when not in use, these bolts and nuts must be loosened before work can be done when they are in use. This further delays the work of setting up temporary scaffolding, so there is a need for a streamlined structure for net brackets that hold multiple safety nets, which can be set up and stored with simple operations whether in use or not.

[0015] The third problem is that the arm member is easily damaged when it is supported horizontally. That is, when supporting the arm member horizontally, conventional net brackets are configured so that the arm member is placed directly on horizontal bolts such as stopper bolt 16 and arm support 24.

[0016] As a result, the load is concentrated on the mounting surface of the arm member via the stopper bolt 16 and the bolts of the arm support 24. This makes the mounting surface extremely susceptible to scratches, and scratches on the mounting surface can cause rust, shortening the lifespan of the arm member.

[0017] As described above, conventional net brackets have had various problems. Therefore, the present invention was created to solve the above problems, and aims to provide a net bracket that is lightweight, prevents tilting when attached, and has excellent operability and durability. [Means for solving the problem]

[0018] The first means of achieving the above-mentioned object in the present invention is a net bracket comprising a flat U-shaped fixing device 10 which is detachably connected to a clamp fitting C which is fixed to a scaffolding pipe P, and an extendable arm member 20 which is swingably connected to the fixing device 10, wherein the fixing device 10 comprises a fixing plate 11 which is screwed to the side of the clamp fitting C, and a pair of left and right connecting plates 12 which connect the arm member 20 across them, and a rotation stopper 11A is provided at the connecting part between the fixing plate 11 and the clamp fitting C.

[0019] The rotation stoppers 11A of the second means are formed by bending the upper and lower end portions of the plate surface of the fixed plate 11, and are configured to engage with the upper and lower side surfaces of the clamping metal fitting C.

[0020] The rotation stopper 11A of the third means is configured to have a concave-convex shape formed on the plate surface of the fixed plate 11 and the side surface of the clamping member C, and is configured so that these concave-convex shapes engage with each other.

[0021] The fourth means comprises a slide bolt 30 that passes through the arm member 20, and the slide bolt 30 is slidably connected to a slide hole 12A formed in the connecting plate 12. The slide hole 12A is formed in an arc shape that allows the arm member 20 to transition from a horizontal to an upright state, and a bolt retaining hole 12B is formed extending vertically downward from either end of the slide hole 12A, so that the slide bolt 30 is retained in the bolt retaining hole 12B when the arm member 20 is stored.

[0022] The fifth means comprises a support bolt 40 that passes through the arm member 20, and the support bolt 40 is inserted into a support hole 13 formed in the connecting plate 12 to support the arm member 20 so that it can swing freely, and the support bolt 40 and the slide bolt 30 are configured to support the arm member 20 horizontally when in use. [Effects of the Invention]

[0023] As in the present invention, by providing a rotation stopper 11A at the connection between the plate surface of the fixed plate 11 and the clamp fitting C, tilting of the net bracket can be prevented. Moreover, the weight of the net bracket can be reduced because the conventional reinforcing material that abuts against the side of the scaffolding pipe is no longer necessary. It can also be used for new types of scaffolding, such as wedge scaffolding and next-generation scaffolding.

[0024] Furthermore, by forming a bolt holding hole 12B that holds the slide bolt 30 vertically below the slide hole 12A of the connecting plate 12, the arm member 20 can be stored and fixed with a single touch when storing it. As a result, it can be set up and stored with a simple operation whether it is in use or not.

[0025] Furthermore, the arm member 20 is supported horizontally by the support bolt 40 and slide bolt 30 that pass through the side of the arm member 20, eliminating the problem that the arm member is easily damaged when supported horizontally as in the past. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 1 is a side view showing a state in which the present invention is used. [Figure 2] FIG. 2 is a side view showing the storage state of the present invention. [Figure 3] FIG. 1 is a perspective view showing a state in which the present invention is used. [Figure 4] FIG. 2 is an exploded perspective view showing the rotation stopper of the present invention. [Figure 5] FIG. 10 is an exploded perspective view showing another embodiment of the rotation stopper of the present invention. [Figure 6] 1A to 1D are side views showing slide holes and bolt holding holes of the present invention. [Figure 7] 10A to 10C are side views showing other embodiments of the slide hole and the bolt retaining hole of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0027] The bracket of the present invention is a net bracket used when installing a safety net on temporary scaffolding. The basic configuration of the present invention is equipped with a flat U-shaped fixture 10 that connects to a clamp fitting C, and a telescopic arm member 20 that is swingably connected to the fixture 10 (see Figure 3).

[0028] The fixture 10 comprises a fixing plate 11 that is connected to the side of the clamp fitting C by screws, and a pair of connecting plates 12 that connect the two by sandwiching the arm member 20 between them (see FIG. 3). In the illustrated example, the fixing plate 11 and connecting plate 12 are formed separately, but it is also possible to form the fixing plate 11 and connecting plate 12 from a single plate (not shown). In the illustrated example, a connecting hook 50 is provided to connect the fixture 10 and the arm member 20 to a safety net. The position and size of the connecting hook 50 can be changed as desired.

[0029] Furthermore, a rotation stopper 11A is provided at the connecting portion between the plate surface of the fixed plate 11 and the side surface of the clamping member C (see FIG. 1). The illustrated rotation stopper 11A is bent from the upper and lower end portions of the plate surface of the fixed plate 11 and is configured to engage with the upper and lower sides of the clamping member C (see FIG. 4).

[0030] The structure of the rotation stopper 11A may also be configured to have recesses and protrusions formed on the surface of the base plate 11 and the side of the clamping fitting C, and these recesses and protrusions may be configured to engage with each other (see FIG. 5). In the illustrated example, a hole-shaped locking recess C2 is formed on the side of the clamping fitting C, a convex rotation stopper 11A protrudes from the fixing plate 11, and the rotation stopper 11A is fitted into and locked into the locking recess C2, but the positions of the recesses and protrusions on the clamping fitting C and the fixing plate 11 may also be reversed. Furthermore, the positions, number, shapes, etc. of the recesses and protrusions are not limited to those in the illustrated example and can be changed as desired.

[0031] The arm member 20 is a telescopic member that is swingably connected to the fixture 10, and in the illustrated example is formed from a telescopic pipe material (see FIGS. 1 and 2). That is, a slide pipe 22 is slidably held within the tip of a swing pipe 21 (see FIG. 1). The slide pipe 22 adjusts the overall length of the arm member 20 with a length adjustment bolt 23 provided on the swing pipe 21 (see FIG. 2).

[0032] When in use, the arm member 20 extends the slide pipe 22 and supports it horizontally (see Figure 1). When not in use, the slide pipe 22 is retracted and the swing pipe 21 is stored in an upright position on the scaffold pipe P side (see Figure 2). Note that aluminum angle bar can also be used for this arm member 20 to reduce weight, and the material and shape of the arm member 20 can be changed as desired.

[0033] A circular slide hole 21A and an elongated support hole 21B are formed in this swing pipe 21 (see FIG. 4). Furthermore, a slide bolt 30 that passes through the slide hole 21A and a support bolt 40 that passes through the support hole 21B are provided. Then, when the slide bolt 30 that passes through the slide hole 21A is inserted into the slide hole 12A of the connecting plate 12 and the support bolt 40 that passes through the support hole 21B is inserted into the support hole 13 of the connecting plate 12, the arm member 20 is supported on the connecting plate 12 so as to be able to swing freely (see FIGS. 1 and 2).

[0034] The slide hole 12A of the connecting plate 12 is an arc-shaped hole through which the slide bolt 30 moves when the arm member 20 moves from a horizontal to an upright position (see Figures 6(a) to (c)). Furthermore, a vertical slide hole 12B is formed extending vertically downward from the end of the slide hole 12A.

[0035] This bolt retaining hole 12B is a portion that retains the slide bolt 30 when the arm member 20 is stored when not in use (see FIG. 6(d)). That is, when the arm member 20 is raised at the end of the slide hole 12A, the slide bolt 30 is retained in the bolt retaining hole 12B by its own weight. As a result, the swinging of the base end of the arm member 20 is restricted, and the arm member 20 is fixed with a single touch.

[0036] Meanwhile, the support bolt 40 passing through the support hole 21B of the arm member 20 supports the arm member 20 so that it can swing freely at the position of the support hole 13 of the connecting plate 12 (see FIG. 6). During use, the support bolt 40 and the slide bolt 30 support the arm member 20 horizontally (see FIG. 6(A)). In the illustrated example, the slide bolt 30 engaged with the upper end of the slide hole 12A and the support bolt 40 in the support hole 13 are set to be horizontal.

[0037] When the arm member 20 is not in use, the slide bolt 30 is lowered to the bolt holding hole 12B of the connecting plate 12 (see FIG. 6(d)). At this time, the support bolt 40 passes through the elongated bolt support hole 21B of the arm member 20, so the base end of the arm member 20 moves vertically.

[0038] In this way, the bracket of the present invention adjusts the angle and storage position of the arm member 20 by combining the positions of the slide bolt 30 and the support bolt 40. Furthermore, the combination of the slide hole 12A of the connecting plate 12 and the support hole 21B of the arm member 20 can be changed as desired (see Figure 7).

[0039] 7(A) shows a slide hole 12A that curves leftward from the upper end of the connecting plate 12, and a bolt holding hole 12B that faces downward from the lower end of the slide hole 12A. The support hole 13 is elongated above the slide hole 12A. The slide hole 21A and support hole 21B of the swing pipe 21 are circular.

[0040] 7(b), a slide hole 12A is formed that curves to the right from the upper end of the connecting plate 12, and a bolt holding hole 12B is formed downward from the upper end of the slide hole 12A. The support hole 13 is formed below the slide hole 12A, and is a smaller version of the slide hole 12A. The slide hole 21A and support hole 21B of the swing pipe 21 are circular.

[0041] 7(c), a slide hole 12A is formed that curves to the right from the upper end of the connecting plate 12, and a bolt holding hole 12B is formed at the upper end of the slide hole 12A. The support hole 13 is circular below the bolt holding hole 12B. Furthermore, the slide hole 21A of the swing pipe 21 is elongated, and the support hole 21B is circular.

[0042] The configuration of the present invention is not limited to the illustrated example, and design changes such as the configuration of the fixture 10 and arm member 20 can be freely made within the scope that does not change the gist of the present invention. [Explanation of symbols]

[0043] B Connecting bolt C clamp fittings C1 connection hole C2 Locking recess P Scaffolding pipe Q Next-generation scaffolding 10 Fixtures 11 Fixed plate 11A Rotation stopper 11B Connection hole 12 Connecting plate 12A slide hole 12B Vertical slide hole 13 Support hole 20 Arm member 21 Swinging pipe 21A Slide hole 21B Support hole 22 Slide pipe 23 Length adjustment bolt 30 Slide bolt 40 Support bolt 50 connecting hooks

Claims

1. A net bracket is provided with a flat U-shaped fixture that can be detachably connected to a clamp metal fitting that is fixed to a scaffolding pipe, and an extendable arm member that can be swingably connected to the fixture, The fixing device includes a fixing plate that is screwed to a side surface of the clamp metal fitting, and a pair of left and right connecting plates that sandwich and connect the arm member, A net bracket characterized in that a rotation stopper is provided at the connecting portion between the fixed plate and the clamp metal fitting.

2. 2. The net bracket according to claim 1, wherein the rotation stoppers are bent from upper and lower end portions of the plate surface of the fixing plate and are configured to engage with upper and lower side surfaces of the clamping metal fitting.

3. 2. The net bracket according to claim 1, wherein the rotation stopper is formed as a concave-convex shape on the surface of the fixing plate and on the side surface of the clamping metal fitting, and is configured so that these concave-convex shapes are engaged with each other.

4. 2. A net bracket as described in claim 1, further comprising a slide bolt that passes through the arm member, the slide bolt being slidably connected to a slide hole formed in the connecting plate, the slide hole being formed in an arc shape that allows the arm member to transition from a horizontal to an upright state, and a bolt retaining hole extending vertically downward from either end of the slide hole, so that the slide bolt is retained in the bolt retaining hole when the arm member is stored.

5. 5. A net bracket as described in claim 4, further comprising a support bolt that passes through the arm member, the support bolt being inserted into a support hole formed in the connecting plate to support the arm member so that it can swing freely, and the support bolt and the slide bolt supporting the arm member horizontally when in use.

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