JP2008111242A - Reinforcement bending tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcement bending tool which enables a reduction in a worker's labor and an increase in working efficiency by enabling a reinforcement to be continuously bending-worked without the need for the re-fitting of the reinforcement. <P>SOLUTION: In this reinforcement bending tool B for performing the bending work of the reinforcement 4, a head portion 10, which is equipped with groove portions 14 and 15 for undergoing the fitting of the reinforcement 4, is provided on the side of at least either of both the direction-of-axis-line O1 ends of a rod-like handle portion 1 in such a manner as to be rotatable on a central axis O3 orthogonal to the axis line O1. The head portion 10 is provided in the state of being connected to a ratchet mechanism which is provided in the handle portion 1 so as to regulate its rotational direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a reinforcing bar bending tool for use in, for example, repositioning to correct the direction of a reinforcing bar protruding from concrete during construction of a reinforced concrete structure.

  Conventionally, when constructing a reinforced concrete structure, it is called a barbender when straightening (upsetting) a reinforcing bar bent and protruding from concrete or bending a straight protruding bar at a predetermined bending angle (bending). Reinforcing bar bending tools are used. For example, as shown in FIGS. 15 to 17, this type of reinforcing bar bending tool A is provided at a rod-like handle portion 1 and both ends 1 a and 1 b in the direction of the axis O <b> 1 of the handle portion 1 to fit the reinforcing bars. It is composed of a block-like head portion 3 provided with a groove portion 2 on one surface side. Further, as shown in FIG. 15, the pair of head portions 3 provided at both ends 1 a and 1 b of the handle portion 1 has an extending direction O2 of the groove portion 2 with respect to the direction of the axis O1 of the handle portion 1, for example, 45, for example. The grooves 2 are provided so as to cross each other at an angle of 60 °, and the extending directions O2 of the grooves 2 are provided so as to cross each other at an angle of 90 °, for example.

  When the reinforcing bar 4 is repaired (bending) using the reinforcing bar bending tool A, as shown in FIG. 18 (a), the head 4 (one end 1a side) is placed on the reinforcing bar 4 protruding from the concrete 5. The groove portion 2 of one head portion) 3 is fitted and rotated so that the operator pushes the bundle portion 1 in the direction in which the operator S bends the reinforcing bar 4 as shown in FIG. 18B (rotation direction T). By doing so, the rebar 4 can be bent by the lever principle. Further, when the reinforcing bar 4 is further bent after bending the reinforcing bar 4 to some extent, as shown in FIG. 18 (c), in order to further apply a bending force according to the changed direction of the reinforcing bar 4, By re-fitting the groove 2 of the head part (the other head part) 3 to the reinforcing bar 4 and rotating the handle part 1 again around the other head part 3, the reinforcing bar 4 can be further bent. And it can arrange | position the reinforcing bar 4 in a desired position (direction) by performing a bending operation | work, re-fitting the groove part 2 of one head part 3 and the other head part 3 to the reinforcing bar 4 in this way. it can.

  However, in this reinforcing bar bending tool (barbender) A, it is necessary to refit the head portion 3 and the groove portion 2 of the other head portion 3 in order to place the reinforcing bar 4 at a desired position. There was a problem that a lot of labor was required for the work. In particular, when bending a thick reinforcing bar 4, it is necessary to use a reinforcing bar bending tool A having a long handle part 1 in order to efficiently apply a large bending force. Since the handleability of the reinforcing bar bending tool A is deteriorated, the reattachment of the groove 2 is a heavy burden on the operator S who applies the bending force to the reinforcing bar 4 by human power. Further, when a plurality of reinforcing bars 4 projecting from the concrete 5 are densely arranged, much more labor is required to refit the respective groove portions 2 of the one head portion 3 and the other head portion 3. Cost.

On the other hand, for example, a reinforcing bar bending tool (rebar bending hacker, barbender) disclosed in Patent Document 1 is provided with one head portion (head) only at one end of a handle portion (grip), and the head portion is provided with a reinforcing bar. It comprises a plurality of grooves (grooves) that are different from each other. In this reinforcing bar bending tool, first, a groove part used for bending a reinforcing bar is selected from a plurality of groove parts, and bending is performed through the reinforcing bar in the selected groove part. Further, when the reinforcing bar bent to some extent is further bent, a bending force can be further applied by re-inserting the reinforcing bar into another groove portion of the same head portion. For this reason, bending work can be performed while sequentially switching a plurality of grooves on one end side, and even if the direction of the reinforcing bar changes with the bending work, the handle part is changed, that is, the direction of one end and the other end of the handle part is reversed. Therefore, the labor required for bending work can be reduced.
Japanese Patent Laid-Open No. 10-140836

  However, also in the reinforcing bar bending tool disclosed in the above-mentioned Patent Document 1, it is necessary to switch the groove (refit the reinforcing bars) according to the direction of the reinforcing bar that changes during the bending operation. Can not. For this reason, especially when a plurality of reinforcing bars protruding from the concrete are densely arranged, there is a problem that it is difficult to switch the groove portions, which requires much labor.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a reinforcing bar bending tool capable of bending a reinforcing bar continuously without requiring reinsertion of the reinforcing bar, thereby reducing the labor of an operator and improving the working efficiency. And

  In order to achieve the above object, the present invention provides the following means.

  The reinforcing bar bending tool of the present invention is a reinforcing bar bending tool for bending a reinforcing bar, and is provided with a head portion provided with a groove portion into which the reinforcing bar is fitted at least at one end side of both ends in the axial direction of the rod-shaped handle portion. Is provided so as to be rotatable around a central axis orthogonal to the axis, and the head portion is provided in connection with a ratchet mechanism that is provided on the handle portion and regulates a rotation direction, and a reinforcing bar is provided in the groove portion. When the handle portion is rotated in one direction around the central axis in the fitted state, the handle portion is rotated together with the handle portion so that a bending force for bending the reinforcing bar is applied to the reinforcing bar without rotating. When the handle portion is rotated in the other direction, the handle portion is rotated so that only the handle portion is rotated without applying a bending force to the reinforcing bar.

  In the present invention, since the head portion is connected to the ratchet mechanism, the relative rotation direction of the head portion with respect to the handle portion can be restricted to one direction. Thus, when the operator turns the handle portion in one direction around the central axis of the head portion by fitting a reinforcing bar in the groove portion, the head portion rotates together with the handle portion, that is, the head portion. And the handle portion are not relatively rotated, and the reinforcing bar can be bent by applying a bending force to the reinforcing bar. On the other hand, when the handlebar part is rotated in the other direction when the reinforcing bar is bent to some extent, the head part idles, that is, the reinforcing bar is fitted in the groove without applying bending force to the reinforcing bar. Thus, the head portion can be rotated relative to the handle portion, and the handle portion can be returned to the original position. Then, the rebar can be bent continuously by repeatedly rotating the handle portion in one direction and the other direction.

  Further, in the reinforcing bar bending tool of the present invention, when the handle portion is rotated so as to bend the reinforcing bar in the head portion, there is an engaging recess that engages with the reinforcing bar fitted in the groove portion. It is desirable that it be formed. In this case, when the operator rotates the handle portion so as to apply a bending force to the reinforcing bar, the reinforcing bar in the groove portion is held in engagement with the engaging recess. Therefore, it is possible to ensure the safety of the operator when bending the reinforcing bar manually (manually).

  Furthermore, in the reinforcing bar bending tool of the present invention, the one surface that forms the groove portion of the head portion and extends in the extending direction of the groove portion is recessed in an arc shape in a direction perpendicular to the extending direction, and the engaging recessed portion is provided. It is more desirable that it is formed. In this case, the substantially cylindrical bar-shaped reinforcing bar is securely engaged with and held in the engaging recess, so that the reinforcing bar is more reliably prevented from being detached from the groove, thereby ensuring the safety of the operator. be able to.

  Further, in the reinforcing bar bending tool of the present invention, the head portion includes a substantially disc-shaped pedestal portion connected to the ratchet mechanism, and a plurality of projecting portions that project from the pedestal portion in the central axis direction to form the groove portion. It is more desirable to be configured with. In the present invention, the pedestal portion is formed in a disk shape, that is, the outer periphery of the head portion is formed in a circular shape, so that, for example, the handle portion is rotated by repositioning the reinforcing bar to apply a bending force to the reinforcing bar. In this case, the head part that rotates together with the handle part can be prevented from coming into contact with the concrete at the base of the reinforcing bar, and even when the outer periphery of the head part comes into contact with the concrete, the head part is caught by the concrete and turned. Can be prevented. Thereby, a reinforcing bar can be reliably bent continuously.

  Furthermore, in the reinforcing bar bending tool of the present invention, it is further desirable that the head portion is detachably provided on the handle portion. In this invention, for example, when bending a reinforcing bar having a different thickness, it can be replaced with a head portion having a groove portion having a width and / or depth corresponding to the reinforcing bar having a different thickness, It is possible to flexibly cope with the types of reinforcing bars. In addition, by making the head portion detachable in this way, it is possible to improve maintenance.

  In the reinforcing bar bending tool of the present invention, a plurality of the groove portions may be formed in the head portion, and the plurality of groove portions may be formed with different widths and / or depths. In the present invention, when bending a plurality of reinforcing bars having different thicknesses, a groove portion corresponding to the thickness of the reinforcing bar can be selected from the groove portions having different head widths and / or depths. A plurality of reinforcing bars having different thicknesses can be continuously bent at the head portion.

  According to the reinforcing bar bending tool of the present invention, unlike the conventional reinforcing bar bending tool, it is not necessary to switch the groove (re-insertion of the reinforcing bar) according to the direction of the reinforcing bar changing during the bending operation, and the bending operation is continuously performed. Therefore, the labor required for the bending work can be greatly reduced and the work efficiency can be improved.

  Hereinafter, a reinforcing bar bending tool according to an embodiment of the present invention will be described with reference to FIGS. The present embodiment relates to a reinforcing bar bending tool used for repairing, for example, correcting the direction of a reinforcing bar protruding from concrete when a reinforced concrete structure is constructed.

  As shown in FIGS. 1 to 6, the reinforcing bar bending tool B of the present embodiment is orthogonal to the axis O1 on the one end 1a side of both ends 1a and 1b in the direction of the axis O1 of the handle 1 and the axis O1. And a head portion 10 provided to be rotatable around a central axis O3.

  As shown in FIGS. 2 and 3, the handle portion 1 is provided with a ratchet mechanism 11 that connects the head portion 10 to the one end 1 a side. The ratchet mechanism 11 is provided in, for example, a known ratchet wrench. It is comprised similarly to the ratchet mechanism.

  That is, the ratchet mechanism 11 includes a rotating portion 11a that protrudes from the inside of the handle portion 1 to the outside in the direction orthogonal to the axis O1 (in the direction of the central axis O2), and a claw member (not shown) that regulates the rotating direction of the rotating portion 11a. It is composed of The rotating portion 11a has a front end side projecting outward from the handle portion 1 having a square cross section, and a rear end side (not shown) disposed inside the handle portion 1 has a substantially circular cross section. A ratchet gear is formed by forming a plurality of teeth on the outer peripheral surface of the rear end of the substantially circular cross section.

  Further, the claw member of the ratchet mechanism 11 is formed in a plate shape, for example, and includes a pair of claw portions that can mesh with the ratchet gear. The claw member is provided inside the handle portion 1 and is rotatably supported by a shaft portion (not shown) fixed inside the handle portion 1. And a nail | claw member can mesh | engage one nail | claw part and the other nail | claw part with a ratchet gear separately according to a rotation direction by operator's operation. At this time, when the operator meshes one claw portion with the ratchet gear, the rotating portion 11a rotates only in one direction around the central axis O3, and when the other claw portion meshes, The rotating part 11a rotates only in the other direction.

  On the other hand, as shown in FIGS. 1, 4, and 5, the head portion 10 protrudes outward in the direction of the central axis O <b> 3 from the disc-shaped pedestal portion 12 having a center hole 12 a having a square cross section and one surface 12 b of the pedestal portion 12. The four projecting portions 13 are configured. The four projecting portions 13 are each formed in an L shape with a pair of plate-like wall portions 13a and 13b orthogonal to each other, and the outer surfaces (one surface) of each pair of wall portions 13a and 13b of the four projecting portions 13 ) 13c, two grooves 14 and 15 are formed that extend linearly (extend in the directions of straight lines O4 and O5) and are orthogonal to each other on the central axis O3. That is, the four protrusions 13 are arranged side by side in the circumferential direction at the center axis O3 center, and two protrusions 13 are arranged at symmetrical positions around the center axis O3. The opposing wall portions 13a and 13b of the projecting portions 13 adjacent to each other are arranged so as to be parallel to each other with a space therebetween. Thereby, the two groove parts 14 and 15 formed of the four protrusions 13 are formed so as to have a cross shape. At this time, the center hole 12a is provided in the groove portions 14 and 15 where the two groove portions 14 and 15 intersect (the center of the cross-shaped groove portions 14 and 15). Further, in the present embodiment, the pair of wall portions 13a and 13b of each projecting portion 13 are respectively provided with end portions located on the radially outer side with the central axis O3 as the center, as shown in FIGS. An engaging recess 16 is formed which is cut from the base end in the protruding direction, which is connected to the one surface 12b of the pedestal portion 12, from the base end to the front end and from the outer side (end portion) in the substantially radial direction.

  As shown in FIGS. 1 and 6, the head portion 10 formed in this way is provided with a rotary section 11 a having a square cross section of the ratchet mechanism 11 in a center hole 12 a having a square cross section from the other surface 12 c side of the pedestal section 12. By being inserted (fitted), the handle portion 1 is detachably mounted.

  In addition, such a head part 10 cut | disconnects angled steel by predetermined length, forms the several protrusion part 13, and these protrusion parts 13 are welded etc. to the base part 12 manufactured previously. It can be manufactured by a simple method of fixing. Also in the pedestal portion 12, for example, as shown in FIGS. 7 and 8, a ring-shaped member 12e formed around a circular hole 12d having a predetermined diameter is prepared, and the rotating portion 11a of the ratchet mechanism 11 is provided. It can also be easily manufactured by inserting a commercially available socket 12f having a hole (center hole 12a) to be engaged into the hole 12d of the ring-shaped member 12e and fixing it by welding or the like. Further, a commercially available product provided with a ratchet mechanism 11 can also be used in the handle portion 1. Therefore, since it can be manufactured using a commercially available angle steel, a socket 12f, and a ratchet mechanism 11 (handle portion 1) that can be easily obtained in this way, the reinforcing bar bending tool B of this embodiment is inexpensive. It is supposed to be.

  Next, a method of bending a reinforcing bar using the reinforcing bar bending tool B configured as described above will be described, and the operation and effect of the reinforcing bar bending tool B of the present embodiment will be described.

  When the reinforcing bar bending tool B of the present embodiment is used to repair the reinforcing bar 4 projecting from the concrete 5 during the construction of the reinforced concrete structure (floor 20), as shown in FIG. 9 and FIG. The reinforcing bars 4 are inserted and fitted into the single groove 15 of the mounted head portion 10. At this time, the reinforcing bar 4 is inserted (fitted) in a state substantially parallel to the extending direction O5 of the groove 15 shown in FIGS. In addition, since the operator is located on the side opposite to the direction in which the reinforcing bar 4 is bent (the rear side in the rotation direction T1 shown in FIG. 9), the operator is positioned as shown by the broken line in FIG. The reinforcing bar bending tool B is set so as to be inclined toward the worker side. Further, at this time, the reinforcing bar bending tool B is operated so that, for example, one claw portion of the claw member of the ratchet mechanism 11 is engaged with the ratchet gear by the operator's operation, and the handle portion 1 is separated (pressed) from the operator. When rotating around the central axis O3 (rotation direction T1), both the handle portion 1 and the head portion 10 are rotated, that is, the handle portion 1 and the head portion 10 are rotated at the same rotation angle θ. Conversely, when the handle portion 1 is rotated so as to approach the operator side (to be pulled in) (rotation direction T2), the head portion 10 maintains its position and only the handle portion 1 is moved. The reinforcing bar bending tool B is set so that the head portion 10 rotates idly (rotates) with respect to the rotation of the handle portion 1.

  Then, when the operator pushes the handle portion 1 and turns it in the turning direction T1 from the fitting state in which the extending direction of the reinforcing bar 4 is arranged substantially parallel to the extending direction O5 of the groove portion 15. As shown in FIGS. 9 and 11, the head portion 10 rotates together with the handle portion 1, and first, the reinforcing bar 4 in the groove portion 15 is crossed so that the extending direction O5 of the groove portion 15 and the extending direction of the reinforcing bar 4 intersect each other. The relative position of changes. Then, when the reinforcing bar 4 moves in the groove 15 until it abuts against the protrusion 13 of the head 10, the engagement recess 16 of each protrusion 13 disposed at a symmetrical position about the central axis O <b> 3 of the head 10. The reinforcing bars 4 are engaged so that the reinforcing bars 4 are held so as not to be detached from the grooves 15.

  When the operator further rotates the handle portion 1 while the reinforcing bar 4 is held in this manner, a bending force is applied to the reinforcing bar 4 in contact with the protruding portion 13 and the reinforcing bar 4 starts to bend. Next, it is necessary to further bend the reinforcing bar 4 to such an extent that the operator does not stick the body onto the opening 21 of the floor 20, that is, in a state where the handle portion 1 is rotated in the rotation direction T 1 without difficulty. In this case, as shown in FIG. 9, the worker turns the handle portion 1 in the turning direction T2 so as to approach the worker side in the future. At this time, the ratchet mechanism 11 causes the head portion 10 to idle with respect to the handle portion 1, so that the position of the head portion 10 that holds the rebar 4 bent to some extent is maintained. Then, when the operator rotates again in the rotation direction T1 so as to push the handle portion 1 again, a bending force acts on the reinforcing bar 4 again, and the reinforcing bar 4 is further bent.

  Thus, in the reinforcing bar bending tool B of the present embodiment, it is not necessary to bend the reinforcing bar 4 to a certain extent after bending the reinforcing bar 4 to some extent, and to refit the handle bar B again, unlike the conventional reinforcing bar bending tool A described above. The rebar 4 can be bent continuously by repeatedly rotating the part 1 in forward and reverse directions (one direction and the other direction). In addition, since the rebar 4 can be arranged at a desired position by repeatedly rotating the handle portion 1 in the forward and reverse directions, the rebar 4 can be bent by reducing the rotation angle θ of the handle portion 1 by the operator, For example, since it does not become an unreasonable posture that an operator protrudes to the opening part 21, it can always be repaired (bending of the reinforcing bar 4) in a safe state. Further, since the reinforcing bar 4 fitted in the groove 15 is engaged with the engaging recess 16, the reinforcing bar 4 may be detached from the groove 15 while the operator rotates the handle part 1. In this respect, the rebar 4 can be bent while securing a safe state.

  Therefore, in the reinforcing bar bending tool B of the present embodiment, since the head portion 10 is connected to the ratchet mechanism 11, the rotation direction of the head portion 10 with respect to the handle portion 1 can be regulated in one direction. By repeatedly rotating the handle portion 1 in one direction and rotating in the other direction, the reinforcing bar 4 can be bent continuously, and labor can be greatly reduced. Further, even when a plurality of reinforcing bars 4 protruding from the concrete 5 are densely arranged, the bending work of the reinforcing bars 4 can be continuously performed, so that the labor can be greatly reduced. Become. Therefore, according to the reinforcing bar bending tool B of the present embodiment, it is possible to efficiently perform the bending process of the reinforcing bar 4 while ensuring the safety of the operator.

  Further, in the reinforcing bar bending tool B of the present embodiment, the base part 12 is formed in a disk shape and the outer periphery of the head part 10 is formed in a circular shape. When the head portion 10 of the hour rotates, it is possible to suppress contact with the concrete 5 at the base of the rebar 4, and even when the head portion 10 contacts the concrete 5 at the base of the rebar 4, It is possible to prevent the head portion 10 from being caught on the concrete 5 and hindering its rotation. Thereby, the reinforcing bar 4 can be reliably bent continuously.

  Furthermore, when the head part 10 is detachably attached to the handle part 1, for example, when bending a reinforcing bar 4 having a different thickness, a width d1 corresponding to the thickness of the reinforcing bar 4 (FIG. 4). It is possible to easily cope with this by replacing the head portion 10 with the groove portions 14 and 15 having different widths d1) and / or depths d2 (depth d2 shown in FIG. 5). Further, by making the head portion 10 detachable as described above, the maintenance of the head portion 10 and the handle portion 1 (the ratchet mechanism 11) can be easily performed.

  As mentioned above, although embodiment of the reinforcing bar bending tool which concerns on this invention was described, this invention is not limited to said one Embodiment, It can change suitably in the range which does not deviate from the meaning. For example, in the present embodiment, the head portion 10 is detachably provided on the handle portion 1, but the head portion 10 is provided to be fixed to the rotating portion 11 a of the ratchet mechanism 11 of the handle portion 1. Also good. Moreover, although the head part 10 shall be provided only in the one end 1a side of the handle | steering-wheel part 1, you may provide the ratchet mechanism 11 and the other head part 10 connected to this also in the other end 1b side. In this case, for example, the head portions 10 having different widths d1 and / or depths d2 of the groove portions 14 and 15 are attached to the one end 1a side and the other end 1b side, respectively, so that the reinforcing bars 4 having different thicknesses can be easily provided. It is possible to correspond to.

  Moreover, in this embodiment, although the two groove parts 14 and 15 shall be formed in the head part 10 so that it may form a cross shape, the head part of the reinforcing bar bending tool which concerns on this invention is a single groove part. May be provided, and it may be provided with three or more grooves. In the present embodiment, the two groove portions 14 and 15 are illustrated as having the same width and depth. However, for example, the plurality of groove portions may be formed with different widths d1 and / or depths d2. . In this case, when bending a plurality of reinforcing bars 4 having different thicknesses, the width d1 and / or the depth corresponding to the thickness of the reinforcing bar 4 out of the grooves having different widths d1 and / or depths d2. It is possible to select a groove portion having a length d2 and to bend the reinforcing bar 4 by fitting the reinforcing bar 4 into the groove portion, and thereby it is possible to deal with a plurality of reinforcing bars 4 having different thicknesses by one head portion 10. become.

  Furthermore, in the present embodiment, the head portion 10 is configured to include the disk-shaped pedestal portion 12 and the plurality of L-shaped protruding portions 13, but it contacts the concrete 5 during bending of the reinforcing bar 4. In the case where the rotation of the head unit 10 is not hindered, such as when there is no fear of such, for example, as shown in FIG. 12, the rebar bending tool B is configured to include the head unit 10 whose outer periphery is formed in a square shape. May be. Moreover, as shown in FIG. 12, the protrusion part 13 which forms the groove parts 14 and 15 may be formed in the block shape, and it is not necessary to specifically limit the shape.

Further, in the present embodiment, the engagement recess 16 is provided at the end of each protrusion 13 from the base end in the protrusion direction connected to the one surface 12b of the pedestal portion 12 to the front end and from the outer side (end part) in the substantially radial direction. For example, in the case where the head portion 10 shown in FIG. 12 is provided, as shown in FIGS. 13 and 14, the groove portion 14 of the block-like protruding portion 13, 15 is formed so that one surface 13c extending in the extending directions O4 and O5 of the grooves 14 and 15 is recessed in a circular arc shape in a direction perpendicular to the extending directions O4 and O5, and is extended by this concave arc-shaped one surface 13c. An engagement recess 16 extending in the directions O4 and O5 may be formed. In this case, since the substantially cylindrical bar-shaped reinforcing bar 4 is securely engaged and held in the engaging recess 16, the reinforcing bar 4 is surely prevented from being detached from the groove parts 14 and 15, and the operator's safety is ensured. Sex can be secured.
Further, even when the head portion 10 is configured by including a plurality of L-shaped projecting portions 13 as in the present embodiment, the plate-like wall portions 13 a and 13 b constituting the projecting portion 13 are replaced with the groove portions 14. , 15 is formed so that the outer surface (one surface) 13c is recessed in an arc shape in a direction orthogonal to the extending directions O4 and O5, and the engaging recess 16 extending in the extending directions O4 and O5 is formed. Similarly to the above, it is possible to prevent the reinforcing bars 4 from coming off from the groove portions 14 and 15 more reliably than in the present embodiment, thereby ensuring the safety of the operator.

  Furthermore, the reinforcing bar bending tool B of the present invention is not limited to being applied to repairing the reinforcing bars 4, and may be used for bending other reinforcing bars 4. Further, in this embodiment, when the operator turns the handle portion 1 so as to push it in, a bending force is applied to the rebar 4. However, the operator turns the handle portion 1 so that the handle portion 1 is pulled forward. It is also possible to use the reinforcing bar 4 with a bending force applied.

It is a perspective view which shows the reinforcing bar bending tool which concerns on one Embodiment of this invention. It is a front view which shows the handle | steering-wheel part of the reinforcing bar bending tool which concerns on one Embodiment of this invention. FIG. 3 is a view taken along line XX in FIG. 2. It is a front view which shows the head part of the reinforcing bar bending tool which concerns on one Embodiment of this invention. FIG. 5 is a view taken along the line XX in FIG. 4. It is a figure which shows the state which mounts a head part to the handle | steering-wheel part of the reinforcing bar bending tool which concerns on one Embodiment of this invention. It is a front view which shows the modification of the head part of the reinforcing bar bending tool which concerns on one Embodiment of this invention. It is a XX arrow directional view of FIG. It is a figure which shows the state which is repairing the reinforcing bar using the reinforcing bar bending tool which concerns on one Embodiment of this invention. It is a top view which shows the state which the rebar fitted in the head part of the rebar bending tool which concerns on one Embodiment of this invention. It is a front view which shows the state which the reinforcing bar engaged with the engagement recessed part of the head part of the reinforcing bar bending tool which concerns on one Embodiment of this invention. It is a perspective view which shows the modification of the reinforcing bar bending tool which concerns on one Embodiment of this invention. It is a perspective view which shows the modification of the engagement recessed part of the head part of the reinforcing bar bending tool which concerns on one Embodiment of this invention. FIG. 14 is an X1-X1 arrow view (X2-X2 arrow view) showing the head portion of FIG. 13. It is a front view which shows the conventional reinforcing bar bending tool. It is a rear view which shows the conventional reinforcing bar bending tool. It is a top view which shows the conventional reinforcing bar bending tool. It is a figure which shows the state which is repairing using the conventional reinforcing bar bending tool.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Handle part 1a One end 1b The other end 4 Reinforcement 5 Concrete 10 Head part 11 Ratchet mechanism 11a Rotating part 12 Base part 12a Center hole 12b One side 12c Other side 13 Protruding part 13c Outer side (one side)
14 Groove portion 15 Groove portion 16 Engaging recess A Conventional rebar bending tool B Rebar bending tool T Turning direction S Operator O1 Handle portion axis O3 Center axis

Claims (6)

A rebar bending tool for bending rebar,
A head portion provided with a groove portion into which the reinforcing bar is fitted is provided at least on one end side in the axial direction both ends of the rod-shaped handle portion so as to be rotatable around a central axis perpendicular to the axis line,
The head portion is provided on the handle portion and connected to a ratchet mechanism that regulates the rotation direction, and the handle portion is arranged in one direction around the central axis in a state where a reinforcing bar is fitted in the groove portion. When it is rotated, it rotates together with the handle part so that a bending force for bending the reinforcing bar is applied to the reinforcing bar without rotating, and when the handle part is rotated in the other direction, the bending force is applied to the reinforcing bar. The reinforcing bar bending tool is characterized in that it rotates so that only the handle portion rotates without acting. In the reinforcing bar bending tool according to claim 1,
The head portion is formed with an engaging recess that engages with the reinforcing bar fitted in the groove when the handle portion is rotated so as to bend the reinforcing bar. Bending tool. In the reinforcing bar bending tool according to claim 2,
Reinforcing bar bending characterized in that one surface that forms the groove portion of the head portion and extends in the extending direction of the groove portion is recessed in an arc shape in a direction orthogonal to the extending direction, and the engaging recess is formed. tool. In the reinforcing bar bending tool according to any one of claims 1 to 3,
The head portion includes a substantially disk-shaped pedestal portion connected to the ratchet mechanism, and a plurality of projecting portions that project from the pedestal portion in the central axis direction to form the groove portion. Reinforcing bar bending tool. In the reinforcing bar bending tool according to any one of claims 1 to 4,
The rebar bending tool, wherein the head portion is detachably attached to the handle portion. In the reinforcing bar bending tool according to any one of claims 1 to 5,
A reinforcing bar bending tool, wherein a plurality of the groove portions are formed in the head portion, and the plurality of groove portions are formed with different widths and / or depths.

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