JPH0533261Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The inventive chiak is used for embedding and fixing deformed reinforcing bars in concrete or the like using chemical adhesion.

[Conventional technology] For example, when installing a shear wall in a concrete structure, the existing structure and the post-cast shear wall are integrated by embedding and fixing deformed reinforcing bars in the existing structure and connecting the reinforcing bars of the shear wall. To do this, a hole is drilled in the existing structure, a capsule containing a synthetic resin base agent and its hardening agent is loaded into the hole, and the deformed reinforcing bar is inserted while rotating to open the capsule. Deformed reinforcing bars are fixed as they are by crushing them and mixing and curing them with a base material and a hardening agent.

However, as is well known, deformed reinforcing bars have ribs extending in the longitudinal direction and ribs extending in the circumferential direction on the outer circumferential surface, so the outer circumferential surface is not smooth and it is difficult to attach the reinforcing bars to a rotating power tool to transmit rotational force. It is difficult to get the dog to bite. Therefore, a chuck for appropriately transmitting rotational force to deformed reinforcing bars has been proposed, for example, in Japanese Utility Model Application Publication No. 17964/1983. That is,
In the chuck proposed in this publication, an annular inner cylinder is loosely fitted into an elongated hole with an almost triangular end face provided in the main body, and three lock pins installed on the inner wall of the elongated hole are inserted into slots in the inner cylinder. It is constructed by inset,
The deformed reinforcing bar is inserted into the inner cylinder, the main body is rotated by a rotary power tool, and the inner cylinder is integrated with the main body by preventing the lock pin from moving in the circumferential direction by the almost triangular inner circumferential wall of the elongated hole. The deformed reinforcing bar is rotated, and the rib of the deformed reinforcing bar engages with a lock pin protruding inward of the inner cylinder, thereby rotating the deformed reinforcing bar integrally with the inner cylinder.

[Problems to be solved by the invention] However, the chuck proposed in the above publication has an approximately triangular elongated hole in the main body, which is cumbersome to process, and also has a lock pin and a grooved inner cylinder. Since a locking pin and a means to prevent the inner cylinder from coming out are required, the number of parts is large and the configuration is complicated. There are problems such as the need to prepare a dedicated chuck.

Therefore, the present invention provides a chuck for rotating deformed reinforcing bars that is capable of transmitting rotational force to deformed reinforcing bars with a simple configuration, and can also rotate deformed reinforcing bars of various diameters and shapes together.

[Means for Solving the Problems] The present invention includes a body, a connecting portion that protrudes from one end thereof and is attached to a rotary power tool, and a connecting portion that is provided in the body and opens to the other end. a main body having an insertion hole and an opening that is open to the outer circumferential surface and communicates with the insertion hole; , a tip portion provided with an engaging protrusion that engages with a rib of a deformed reinforcing bar inserted into the insertion hole faces toward the rotational direction of the main body and is positioned in front of the shaft; A locking lever that can be moved in and out of the insertion hole; and a spring that acts on the locking lever by urging the tip portion in a direction to project into the insertion hole. This is a means to solve the above problems.

[Operation] Rotate the locking lever against the biasing force of the spring to retract the tip from the insertion hole, insert the deformed reinforcing bar into the insertion hole, release the locking lever, and retract the tip. When the main body is rotated after protruding into the insertion hole, the engagement protrusion at the tip of the locking lever engages with a rib extending longitudinally on the outer peripheral surface of the deformed reinforcing bar, and the main body is rotated as a unit. . Alternatively, the engagement can be removed by rotating the locking lever against the biasing force of the spring and retracting the tip from the insertion hole.

[Example] An example of the present invention will be described based on the drawings.
The main body 1 is formed into a cylindrical block shape as a whole,
A connecting part 2 consisting of a hexagonal shaft that is attached to a rotary power tool is integrally protruded from one end thereof,
An insertion hole 3 of an appropriate depth is provided at the other end with an approximately square end surface. Further, an opening 5 is formed in the body 4 of the main body 1, and the opening 5 communicates with the insertion hole 3 from the direction of the inner wall surface 3a of one of the insertion holes 3. That is, a shaft 6 is installed parallel to the insertion hole 3 at a position corresponding to the rear end of the main body 1 in the direction of rotation, and a locking lever 7 is rotatably attached to the shaft 6. This locking lever 7 is formed into a substantially L-shape, consisting of an operation piece 8 on the rear end side and a tip part 10 on the front side from which an engaging protrusion 9 is protruded. A biasing force is applied by the spring 11 so that the tip 10 projects into the insertion hole 3 and rotates until it hits the opening edge 5a.

The deformed reinforcing bar 12 inserted into the insertion hole 3 has a rib 14 extending longitudinally and protruding from the outer circumferential surface 13.
and a rim 15 extending in the circumferential direction, and two ribs 14 are formed at centrally symmetrical positions. Second
The figure shows that the deformed reinforcing bar 12 is inserted into the insertion hole 3 of the main body 1,
The connecting part 2 is attached to the tip of the rotary power tool 16 and inserted while rotating into the embedding hole 18 drilled in the concrete 17, and the capsule 21 containing the main agent 19 and the hardening agent 20 separately is inserted into the embedding hole 18. This shows the situation when crushing inside.

To use the chuck for rotating deformed reinforcing bars having the above configuration, first, connect the connecting portion 2 to the rotary power tool 16.
Attach the operating piece 8 of the locking lever 7 to the tip of the spring 1.
Push the locking lever 7 toward the main body 1 against the urging force of 1.
Rotate counterclockwise as shown in the figure and insert the tip 10 into the insertion hole 3.
(state shown by the chain line in Figure 3)
Then, as shown in FIG. 4, for example, a deformed reinforcing bar 12 having a maximum diameter approximately equal to the distance between the opposing inner wall surfaces 3b and 3c is inserted into the insertion hole 3. Then, when the locking lever 7 is released, the tip 10 is moved again to the insertion hole 3.
Insert the deformed reinforcing bar 12 into the bottom wall surface 3d of the hole 3.
It will be pressed and held. Next, deformed reinforcing bar 12
When the main body 1 is rotated counterclockwise in the figure while inserting the tip of the reinforcing bar 12 into the embedded hole 18, the deformed reinforcing bar 12 becomes difficult to rotate due to the resistance when it hits the capsule 21, so that it becomes integral with the main body 1. The engaging protrusion 9 of the rotating locking lever 7 comes to engage the rib 14 from the rear in the rotational direction, and the deformed reinforcing bar 12 is thereafter pressed against the engaging protrusion 9, the inner wall surface 3c in front of it, and the bottom wall surface 3d. In this state, it is rotated integrally with the main body 1.

When the tip of the deformed reinforcing bar 12 reaches the bottom of the embedding hole 18 shown in FIG. The stop lever 7 is rotated clockwise in the drawing against the biasing force of the spring 11 to disengage the engagement protrusion 9 and the rib 14, and the main body 1 and the deformed reinforcing bar 1 are disengaged.
2 and separate.

FIG. 5 shows a case where a small-diameter deformed reinforcing bar 12 is rotated, and in this case as well, the engaging protrusion 9 and the rib 14 are connected as in the case of rotating a large-diameter deformed reinforcing bar 12 shown in FIG. The tip 10 of the locking lever 7 and the inner wall surface 3c of the insertion hole 3 are engaged with each other and rotate together, and a biasing force is always applied by the spring 11 in the direction of protruding into the insertion hole 3. A deformed reinforcing bar 12 is held between the bottom wall surface 3d and the bottom wall surface 3d. Even if the deformed reinforcing bar 12 attempts to stop due to the resistance received from the capsule 21, the engagement protrusion 9 that engages with the rib 14 at the rear in the rotational direction pushes, and the tip 10
Since it collides with the opening edge 5a and does not rotate any further backward, it rotates reliably following the rotation of the main body 1 without spinning or slipping.

Note that when the deformed reinforcing bar 12 is inserted into the insertion hole 3, its center is held offset from the rotation center of the main body 1,
When the diameter is small as shown in FIG. 5, the amount of eccentricity is large, but as described above,
By being sandwiched and held at three locations, it is possible to rotate integrally with the main body 1 on a circle centered around the rotation center of the main body 1 and having a radius equal to the amount of eccentricity.

[Effects of the invention] According to the invention, rotational force can be transmitted to deformed reinforcing bars with a simple configuration and operation, and it is possible to freely rotate deformed reinforcing bars of various diameters and shapes without the need for troublesome work such as replacing parts. It can be rotated as one unit without causing slippage or slippage.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 is a front view showing the state of use, and Fig. 3 is A--A of Fig. 1.
A cross-sectional view taken along line A, FIGS. 4 and 5 are explanatory diagrams showing the state of engagement between the locking lever and the deformed reinforcing bar in the cross-sectional view taken along line A-A in FIG. 1. 1... Main body, 2... Connecting part, 3... Insertion hole, 4
...Body part, 5...Opening part, 7...Latching lever, 9...
...Engagement protrusion, 10...Tip, 11...Spring, 16
...Rotating power tool.

Claims (1)

[Claims for Utility Model Registration] A body part 4, a connecting part 2 that protrudes from one end thereof and is attached to a rotary power tool, and a connecting part 2 that is opened to the other end of the body part 4. Filling hole 3
and a main body 1 having an opening 5 opened on the outer peripheral surface and communicating with the insertion hole 3; rotatably attached to a shaft 6 provided in the opening 5 in parallel with the insertion hole 3; A tip part 10 provided with an engaging protrusion 9 that engages with a rib of a deformed reinforcing bar inserted into the insertion hole 3 is positioned in front of the shaft 6 toward the rotational direction of the main body 1. and a locking lever 7 whose tip portion 10 is retractable into and out of the insertion hole 3; which acts on the locking lever 7 by urging the tip portion 10 in a direction to protrude into the insertion hole 3; Spring 11
A chuck for rotating deformed reinforcing bars characterized by: and;