Rebar connection clamp device

Abstract

The design allows for easy and simple fitting and temporary fastening by simply pressing it against the reinforcing bar, and also enables easy bolt fastening. [Solution] The main clamp body A and sub-clamp body B have a main clamp body A and a sub-clamp body B, each having a pivot portion 5 and a clamping portion 6 on both sides of a clamp portion 4 that abuts against a reinforcing bar 3. A pivot shaft 7 connects the pivot portion 5 of the main clamp body A and the sub-clamp body B so that they can be opened and closed. A bolt 8 has a head 8t connected to the clamping portion 6b of the sub-clamp body B, and a nut 9 is screwed onto this bolt 8. The clamping portion 6a of the main clamp body A has an insertion groove 12a through which the bolt 8 is inserted. An elastic body 13 is provided between the two pivot portions 5 to bias the sub-clamp body B against the main clamp body A, and the two clamping portions 6 are provided with flared guide projections 14 that introduce the reinforcing bar 3 between the two clamp portions 4.

Description

Technical Field

[0001] The present invention relates to a reinforcing bar connection clamp device that can be used in a lightning protection system for protecting building structures and the like from lightning strikes.

Background Art

[0002] A lightning protection system is configured to connect a lightning rod disposed at the top of a building structure to reinforcing bars or metal structures in the building structure with a conducting wire and then ground it. The conducting wire is provided with a connection terminal at its end, and this connection terminal is attached to a clamp device fitted to the reinforcing bar to connect the conducting wire and the reinforcing bar.

[0003] The clamp device disclosed in Patent Document 1 states that "

[0023] FIG. 4 is a schematic perspective view showing an example of a clamp portion according to the present invention. This clamp portion 100 has a first main body 101 and a second main body 102 that are split into two as main members. By using hinge portions 103 and tightening bolts 104 on both ends thereof and arranging another fixing member inside and tightening and gripping it, it is a clamp device. Between the mating surface sides of the two main bodies (101 - 102), when the tightening bolt 104 that can be opened and closed by a hinge pin 109 is opened from the insertion surface direction, passed through another fixing member such as a reinforcing bar or a beam bar, and the nut portion 105 of the tightening bolt 104 is tightened, a tightening and gripping structure can be formed, and sufficient electrical connection can be obtained. This clamp structure is a hardware called a nut cracker type tightening method with a single bolt tightening."

[0004] That is, the clamp device is configured to fasten the clamp portion 100 to the reinforcing bar by fitting the first main body 101 and the second main body 102 to the reinforcing bar and tightening the nut portion 105 of the tightening bolt 104.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] While the conventional clamping device described above can securely fasten the clamp portion to the reinforcing bar, the first body and the second body are only connected by a hinge, allowing for free relative rotation. Therefore, the user must use both hands to wrap the first and second bodies around the reinforcing bar, maintain the wrapped state with one hand, and then use the other hand to engage the tightening bolt and screw in the nut. This makes the fastening process to the reinforcing bar extremely cumbersome and difficult.

[0007] The present invention aims to provide a rebar connection clamping device that can solve the problems of the conventional technology described above.

[0008] The present invention aims to provide a rebar connecting clamp device that allows the main clamp body and the sub-clamp body to be fitted onto a rebar and maintain that position simply by pressing the guide projection against the rebar, by providing an elastic bias of the sub-clamp body relative to the main clamp body and a guide projection with a flared shape on the tip side of the clamp portion. [Means for solving the problem]

[0009] A specific means for solving the problems in the present invention is a rebar connecting clamp device comprising a main clamp body A and a sub-clamp body B having a pivot portion 5 and a clamping portion 6 on both sides of a clamp portion 4 that abuts against a rebar 3, a pivot shaft 7 that connects the pivot portion 5 of the main clamp body A and the sub-clamp body B so that they can be opened and closed, and a bolt 8 with a head 8t connected to the clamping portion 6b of the sub-clamp body B and a nut 9 screwed onto the bolt 8, wherein an insertion groove 12a is formed in the clamping portion 6a of the main clamp body A through which the bolt 8 is inserted, An elastic body 13 biases the sub-clamp body B relative to the main clamp body A between the two pivot parts 5. We have established , The two clamping portions 6 are provided with flared guide projections 14 that guide the reinforcing bar 3 between the two clamp portions 4. Occasionally, The main clamp body A or the sub-clamp body B has a mounting base portion 19 for attaching a connection terminal 22 for connecting a conductor 21 between the pivot portion 5 and the clamp portion 4. [Effects of the Invention]

[0010] According to the present invention, the main clamp body A and the sub-clamp body B can be opened and closed and the clamp portion 4 fitted simply by pressing the guide projection 14 against the reinforcing bar 3, and the fitted state can be temporarily fixed by the biasing force of the elastic body 13, and subsequent bolt fastening can be done easily and simply. Furthermore, the connection terminals 22 to the mounting base 19 can be attached before or after fastening the main clamp A and the sub-clamp B to the reinforcing bar 3. [Brief explanation of the drawing]

[0011] [Figure 1] This is a plan view showing an embodiment of the present invention. [Figure 2] This is a perspective view of the usage state. [Figure 3] This is an explanatory diagram showing the process from fitting the reinforcing bar to fastening it. [Figure 4] This is a side view. [Figure 5] This is an exploded view diagram. [Modes for carrying out the invention]

[0012] Hereinafter, embodiments of the present invention will be described based on the drawings.

[0013] In Figures 1 to 5, the rebar connection clamp device 1 comprises a main clamp body A and a sub-clamp body B, each having a clamp portion 4 whose inner surface abuts against the rebar 3, with pivot portions 5 and clamping portions 6 on both sides; a pivot shaft 7 that connects the pivot portions 5 of the main clamp body A and the sub-clamp body B so that they can be opened and closed; and a bolt 8 with its head 8t connected to the clamping portion 6b of the sub-clamp body B, and a nut 9 screwed onto this bolt 8. The clamping portion 6a of the main clamp body A has an insertion groove 12a through which the bolt 8 is inserted.

[0014] The reinforcing bar connection clamp device 1 has a substantially mirror-symmetrical shape except for a part between the main clamp body A and the sub-clamp body B. The main clamp body A may be referred to as the sub-clamp body, and the sub-clamp body B may be referred to as the main clamp body. It can be inverted upside down with respect to the reinforcing bar 3 and the fastening position can also be changed around the reinforcing bar 3.

[0015] The main clamp body A and the sub-clamp body B are formed of a metal material such as iron or copper. In a plan view, the clamp portions 4 (4a, 4b) have an arc shape with a concave inner surface, the pivot support portions 5 (5a, 5b) have a linear shape connected to the end portions of the clamp portions 4 via a step, the clamping portions 6 (6a, 6b) have a linear shape, and tapered guide protrusions 14 (14a, 14b) are provided at the tips of the clamping portions 6.

[0016] An attachment base portion 19 is formed between the pivot support portion 5 and the clamp portion 4. Since the surface of the attachment base portion 19 is a flat surface, it is connected via a step protruding outward from the end portion of the clamp portion 4, and a connection terminal 22 for connecting the conducting wire 21 can be attached via a bolt.

[0017] A bolt hole 24 is formed in the attachment base portion 19 of the main clamp body A. Although no bolt hole is formed in the attachment base portion 19 of the sub-clamp body B, a pin hole 25 for locking the other end portion 13b of an elastic body 13 described later is formed. Note that it is also possible to form a bolt hole 24 in the attachment base portion 19 of the sub-clamp body B to attach the connection terminal 22.

[0018] The connection terminal 22 is integrally formed with a connection portion 22a having a connection hole for inserting the conducting wire end portion 21 and a flat plate-shaped attachment portion 22b, and the attachment portion 22b is bolted to the attachment base portion 19.

[0019] On the pivot portion 5a of the main clamp body A, upper and lower bearing portions 5a1 project inward. Similarly, on the pivot portion 5b of the sub-clamp body B, upper and lower bearing portions 5b1 project inward. The upper and lower bearing portions 5a1 and 5b1 are not in mirror-symmetrical positions but are offset vertically. When they are overlapped and a pivot shaft 7 is passed through the holes formed in both of them, the main clamp body A and the sub-clamp body B are connected so as to be openable and closable.

[0020] A coil spring as the elastic body 13 is fitted onto the pivot shaft 7. One end portion 13a of this coil spring is bent midway and is locked along the edge of the mounting base portion 19 and at the end portion of the pivot portion 5. The other end portion 13b of the coil spring extends radially outward from the pivot shaft 7 and is locked to the mounting base portion 19.

[0021] Since one end portion 13a of this elastic body 13 is locked to the main clamp body A and the other end portion 13b is locked to the sub-clamp body B, it elastically presses the main clamp body A and the sub-clamp body B in the closing direction. That is, it biases the sub-clamp body B against the main clamp body A so that the reinforcing bar 3 can be elastically clamped. Forcefully clamped.

[0022] This elastic clamping force serves as a temporary fixing force when the reinforcing bar 3 is sandwiched between the main clamp body A and the sub-clamp body B, and becomes a force to prevent the reinforcing bar connection clamp device 1 from slipping off the reinforcing bar 3.

[0023] An insertion groove 12a through which a bolt 8 is inserted is formed in the clamping portion 6a of the main clamp body A. Similarly, an insertion groove 12b through which a bolt 8 is inserted is formed in the clamping portion 6b of the sub-clamp body B.

[0024] On the clamping portion 6b of the sub-clamp body B, a support seat 15 that projects outward from the edge of the insertion groove 12b is formed. This support seat 15 supports the flat surface of the head 8t of the bolt 8 inserted into the insertion groove 12b and is connected to the head 8t of the bolt 8 through a support shaft 16 so as to be rotatable.

[0025] As shown in Figures 1 and 3, the head 8t of the bolt 8 is approximately elliptical in plan view, and the outer elliptical portion is always located within the insertion groove 12b. However, when the bolt 8 is outside the clamping portion 6b, it does not protrude from the insertion groove 12b to the inner surface of the clamping portion 6b. When the bolt 8 is inserted into the insertion groove 12a of the main clamp body A, it protrudes from the insertion groove 12b to the inner surface of the clamping portion 6b.

[0026] The two clamping portions 6 of the main clamp body A and the sub-clamp body B are provided with a pair of flared guide projections 14 (14a, 14b) on the upper and lower sides, except for the groove openings of the insertion grooves 12a and 12b. When both guide projections 14 (14a, 14b) are pressed against the reinforcing bar 3, the main clamp body A and the sub-clamp body B expand apart, allowing the reinforcing bar 3 to be introduced between the two clamp portions 4.

[0027] Figure 3 shows the operation of fastening the rebar connection clamp device 1 to the rebar 3.

[0028] In the rebar connection clamp device 1, before fastening, the two clamping parts 6 of the main clamp body A and the sub-clamp body B are in contact or slightly apart. When the guide projections 14 (14a, 14b) are brought into contact with the surface of the rebar 3 simultaneously, the guide projections 14 (14a, 14b) are pushed apart against the elasticity of the elastic body 13, resulting in state (I). This state (I) can be achieved with just one hand.

[0029] Then, as the main clamp A and the sub-clamp B are pressed further against the reinforcing bar 3, the inner surfaces of the clamping parts 6a and 6b slide against each other and open up, resulting in state (II).

[0030] As the main clamp A and sub-clamp B are pressed further against the reinforcing bar 3, the reinforcing bar 3 is introduced up to the space between the clamp sections 4a and 4b, and the elasticity of the elastic body 13 causes the clamp sections 4a and 4b to fit together, sandwiching the reinforcing bar 3, resulting in state (III). The elastic pressure of the elastic body 13 temporarily fastens and maintains the main clamp A and sub-clamp B against the reinforcing bar 3.

[0031] From state (I) to state (III) above, the rebar connection clamp device 1 can be held in one hand while working.

[0032] In this temporary fastening state (III), the bolt 8 is rotated around the support shaft 16 and inserted into the insertion groove 12a, and the nut 9 is screwed on and pressed against the outer surface of the clamping portion 6a. The initial rotation of the bolt 8 and the nut 9 can be done with one hand. The later stage of screwing on the nut 9, bringing the clamping portions 6a and 6b closer together and tightening, is done using a tool such as a box wrench, and the tightening of the nut 9 fastens the main clamp body A and the sub-clamp body B to the reinforcing bar 3.

[0033] The connection terminal 22 connected to the conductor 21 can be attached to the mounting base 19 either before or after fastening the rebar connection clamp device 1 to the rebar 3.

[0034] In the embodiment described above, a main clamp body A and a sub-clamp body B have a clamp portion 4 that abuts against a reinforcing bar 3, each having a pivot portion 5 and a clamping portion 6 on both sides of the clamp portion 4, a pivot shaft 7 that connects the pivot portions 5 of the main clamp body A and the sub-clamp body B so that they can be opened and closed, and a bolt 8 with its head 8t connected to the clamping portion 6b of the sub-clamp body B and a nut 9 screwed onto the bolt 8, and an insertion groove 12a through which the bolt 8 is inserted is formed in the clamping portion 6a of the main clamp body A, an elastic body 13 that biases the sub-clamp body B relative to the main clamp body A is provided between the two pivot portions 5, and the two clamping portions 6 are provided with flared guide projections 14 that introduce the reinforcing bar 3 between the two clamp portions 4.

[0035] With this configuration, the main clamp body A and the guide projection 14 can be pressed against the reinforcing bar 3. The auxiliary clamp body B opens and closes, allowing the clamp part 4 to fit and clamp the reinforcing bar 3, and the biasing force of the elastic body 13 maintains this fitted and clamped state, enabling temporary fastening, and subsequent tightening of the bolts and nuts is also simple and easy.

[0036] Furthermore, in the above embodiment, the bolt 8 has a flat surface formed on its head 8t. The clamping portion 6b of the sub-clamp body B is formed with an insertion groove 12b through which a bolt 8 is inserted, and a support seat 15 that supports the flat surface of the head 8t of the bolt 8 inserted into the insertion groove 12b. The head 8t of the bolt 8 is supported by the support seat 15 and is rotatably connected via a support shaft 16.

[0037] With this configuration, the rotation of the bolt 8 around the support shaft 16 is guided by the support seat 15 and remains constant, ensuring that the clamping portions 6 of the main clamp body A and the sub-clamp body B are securely inserted into the insertion grooves 12, and facilitating the screwing operation of the nut 9.

[0038] Furthermore, in the above embodiment, the main clamp body A or the sub-clamp body B has a mounting base portion 19 for attaching a connection terminal 22 for connecting a conductor 21 between the pivot portion 5 and the clamp portion 4.

[0039] This configuration allows the connection terminals 22 to be attached to the mounting base 19 either before or after fastening the main clamp A and the sub-clamp B to the reinforcing bar 3.

[0040] Furthermore, in the above embodiment, the elastic body 13 is formed of a coil spring fitted onto the pivot shaft 7, with one end 13a of the coil spring bent midway along the edge of the mounting base portion 19 and locked to the end of the pivot portion 5a, and the other end 13b of the coil spring extending radially outward from the pivot shaft 7 and approaching and being locked to the clamp portion 4b.

[0041] With this configuration, one end 13a of the elastic body 13 does not obstruct the mounting base 19, and the other end 13b is separated from the pivot shaft 7 to provide sufficient elastic force.

[0042] It should be noted that the present invention is not limited to the embodiments described above, and the shape, configuration, and combination of the components can also be changed.

[0043] For example, instead of a coil spring, a leaf spring may be used as the elastic body 13 that biases the sub-clamping body B against the main clamping body A.

[0044] As for the clamping body, two pieces of the same shape as the main clamping body A may be made, one of which will remain as the main clamping body A, and the other may be inverted vertically and a support seat along the insertion groove will be welded to its outer surface to become the sub-clamping body B. [Explanation of symbols]

[0045] 1. Rebar connection clamp device 3 Reinforcement bars 4(4a,4b) Clamp section 5(5a,5b) Cardinal branch 5a1, 5b1 Bearing part 6(6a, 6b) Clamping part 7 Pivot 8 volts 8t head 9 nuts 12 (12a, 12b) Through groove 13 Elastic body 13a One end 13b Other end 14 (14a, 14b) Guide projection 15 Support seat 16 Support shaft 19 Mounting base 21 Conductor 22 Connection terminals 22a Connection part 22b Mounting section 24 bolt holes 25 pin holes A Main clamp body B Sub-clamp body

Claims

1. A rebar connecting clamp device comprising a main clamp body (A) and a sub-clamp body (B) having a clamp portion (4) that abuts against a rebar (3), with a pivot portion (5) and a clamping portion (6) on both sides thereof, a pivot shaft (7) that connects the pivot portion (5) of the main clamp body (A) and the sub-clamp body (B) so as to be openable and closable, and a bolt (8) with a head (8t) connected to the clamping portion (6b) of the sub-clamp body (B) and a nut (9) screwed onto the bolt (8), wherein the clamping portion (6a) of the main clamp body (A) has an insertion groove (12a) through which the bolt (8) is inserted, An elastic body (13) is provided between the two pivot parts (5) to bias the sub-clamp body (B) relative to the main clamp body (A). The two clamping portions (6) are provided with flared guide projections (14) that introduce the reinforcing bar (3) between the two clamp portions (4). The rebar connecting clamp device is characterized in that the main clamp body (A) or the sub-clamp body (B) has a mounting base portion (19) formed thereon for attaching a connecting terminal (22) for connecting a conductor (21) between the pivot portion (5) and the clamp portion (4).

2. The bolt (8) has a flat surface formed on its head (8t), The clamping portion (6b) of the sub-clamp body (B) is formed with an insertion groove (12b) through which a bolt (8) is inserted, and a support seat (15) that supports the flat surface of the head (8t) of the bolt (8) inserted into the insertion groove (12b). The rebar connecting clamp device according to claim 1, characterized in that the head (8t) of the bolt (8) is supported by the support seat (15) and is rotatably connected via the support shaft (16).

3. The elastic body (13) is formed of a coil spring fitted onto the pivot shaft (7), One end (13a) of this coil spring is bent midway and is secured to the edge of the mounting base (19) and to the end of the pivot (5a). The other end (13b) of the coil spring extends radially outward from the pivot shaft (7) to form a clamping portion. The rebar connection clamp device according to claim 1 or 2, characterized in that it is locked in close proximity to (4b).

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