JPH028810B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a bender cutter for bending and cutting reinforcing bars, etc. in reinforced concrete construction.

(Prior art) In general, in reinforced concrete construction, in order to construct columns, beams, etc. of a building, a large number of reinforcing bars are combined into a network and embedded in concrete columns or beams. We are trying to improve the strength of the

The method of constructing reinforcing bars is to combine multiple main reinforcing bars arranged vertically or horizontally parallel to each other into a band shape, with the ends bent at almost right angles, and then bend the ends of these reinforcing bars further to the main reins. This is done by attaching and fixing by bending.

This work of bending the ends of the reinforcing bars and wrapping them around the main reinforcing bars is usually done using a bender for bending reinforcing bars.

As such a bender, an oil tank for storing oil is installed inside the casing body, and an oil pump mechanism installed inside the casing body pumps pressure oil to the cylinder. This forward and backward movement is converted into rotational motion by a rack and pinion mechanism, and the bending arm is rotated to connect the reinforcing bar receiving collar at the base end of the bending arm and the tip of the bending arm. There is one in which the ends of the reinforcing bars are bent between the bending rollers. This bender is used as a portable device at reinforced concrete construction sites.

On the other hand, hydraulic cutters that are portable and easy to handle have been developed for cutting reinforcing bars at construction sites. For example, a pump mechanism for pumping the oil in the oil tank is provided in the casing body of a cutter equipped with an oil tank, and the pressure oil from this pump mechanism is sent into a cylinder, which is slidably disposed inside the cylinder. Hydraulically operated cutters are known in which cutting is performed using a movable blade attached to the tip of the piston rod by sliding a piston head connected to the piston head and linearly moving a piston rod connected to the piston head (for example, as disclosed in the U.S. patent). No. 3733699).

(Problems to be Solved by the Invention) As described above, conventionally, at reinforced concrete construction sites, reinforcing bars are cut and bent alternately using portable benders and cutters.
A large number of reinforcing bars are combined into a network. At this time, each time the reinforcing bars are cut and bent, the cutting cutter and the bending bender are alternately used.

In such a case, it would be convenient for the worker if the same tool could be used to cut and bend the reinforcing bars, since there would be no need to change tools for each cutting and bending operation. At the same time, the on-site environment can be simplified by reducing the number of on-site tools.

The present invention has been made in consideration of these points, and an object of the present invention is to provide a bender cutter having a bending function and a cutting function.

[Structure of the invention]

(Means for Solving the Problems) The present invention is configured to be slidably disposed within a cylinder of a casing body by a hydraulic drive device, and
a piston head having a piston rod formed with a rack on its back surface; a rotating shaft rotatably supported by the casing body in a direction perpendicular to the piston rod and having a pinion that meshes with the rack; a bending arm provided with a bending roller at its tip;
A reinforcing bar receiving collar is attached to the base end of the bending arm so as to face the bending roller and coaxially with the rotating shaft, and a reinforcing bar receiving collar is attached to the casing body in a facing relationship to the reinforcing bar receiving collar. This bender cutter is equipped with a bending stopper, and a movable blade that cuts the reinforcing steel between the fixed blade and the cutting stopper, which are attached to the tip of the piston rod and attached to the casing body.

(Function) According to the present invention, reinforcing bars are inserted between the bending roller, the reinforcing bar receiving collar, and the bending stopper, the bending arm is rotated to perform the reinforcing bar bending work, and the fixed blade and the cutting stopper are rotated. Reinforcing bars are inserted in between, and the movable blade moves forward to cut the reinforcing bars.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

1 and 2 are diagrams showing an embodiment of a bender cutter according to the present invention.

In the figure, reference numeral 2 denotes a motor shaft 2 driven by an electric motor (not shown), and this motor shaft 2 is attached to the casing body 1 while being inserted into the casing body 1. An oil tank 20 in which oil is stored is provided inside the casing body 1, and a pump mechanism 5 for pumping the oil in this oil tank 20 is further provided. A cylinder 7 is formed approximately in the center of the casing body 1, and the cylinder 7 and the oil tank 20 are separated by a vertical wall 27. There are a plurality of pump mechanisms 5 (for example, three
), except for one pump mechanism 5a, the other pump mechanisms 5b (indicated by chain lines at the top in FIG. 1)
The oil supply path 23 that supplies pressure oil from the vertical wall 2
7 and communicates with the cylinder 7. The cylinder 7 and the oil tank 20 communicate with each other through a communication passage 19 provided through a vertical wall 27.
A spool valve mechanism 3 is disposed in the middle of the valve 9.
The spool valve mechanism 3 has the function of opening and closing the communication passage 19, and connects the spring 21 and the communication passage 1
It has a steel ball 4 with 9 closed. In the spool valve mechanism 3, when the pump mechanism 5 is not operating, the spring 21 pushes the steel ball 4 downward and away from the valve seat 19a in the communication passage to open the communication passage 19. An oil return path 29 is formed through the vertical wall 27 to communicate the oil tank 20 with the front end of the cylinder 7 (the end opposite to the vertical wall 27).

These pump mechanism 5, spool valve mechanism 3, oil tank 20, oil passage, etc. constitute a hydraulic drive device.

A piston head 16 is disposed within the cylinder 7 so as to be slidable in the axial direction, and the piston rod 8 is joined to the back surface of the piston head 16. A rack 8a is formed at the tip of the piston rod 8. A piston head return spring 28 is disposed between the back surface of the piston head 16 and the stepped portion 1a of the casing body 1.

A rotating shaft 10 is disposed in the front part of the casing body 1 in a direction perpendicular to the piston rod 8, with a part protruding from the side surface of the casing body 1, and both ends of the rotary shaft 10 are rotatably supported. . A pinion 10a that meshes with a rack 8a is formed on a rotating shaft 10 disposed inside the casing body 1, and a proximal end 9a of a bending arm 9 is connected to a key 15 at a portion protruding outside the casing body 1. Fitted and connected. This base end portion 9a has a cylindrical shape coaxial with the rotating shaft 10, and a ring-shaped reinforcing bar receiving collar 13 is fitted on the outer periphery of the base end portion 9a. Reinforcement receiving collar 1
3 is removably attached, and a washer 31 is pressed and fixed to the end of the washer 31 with a bolt 32 to prevent it from coming off.

At the tip 9b of the bending arm 9, a bending roller 26 is attached to the fixed shaft 3 in a relationship opposite to the collar 13.
It is rotatably attached to 3. In addition, the casing body 1 is arranged opposite to the collar 13.
A bending stopper 25 is screwed onto the front part of the holder.
This bending stopper 25 is moved forward and backward depending on the thickness of the reinforcing bar in order to appropriately clamp the reinforcing bar between the collar 13 and the stopper 25.

Also, a movable blade 11 is provided at the tip of the piston rod 8.
is attached to cut the reinforcing steel between the fixed blade 12 and the cutting stopper 24 attached to the casing body 1.

The bender cutter constructed in this manner can be held and operated by a worker using a handle (not shown) on the right side of FIG. 1.

Next, the operation of this embodiment having such a configuration will be explained.

First, when bending the reinforcing bar 18a, the tip of the reinforcing bar 18a to be bent is inserted between the collar 13 and the bending roller 26. In this case, the stopper 25
is adjusted to set the distance between the collar 13 and the stopper 25 to a suitable value depending on the thickness of the reinforcing bar 18a.
After setting the reinforcing bars 18a in this manner, the electric motor is rotated.

The motor shaft 2 is rotationally driven by the drive of the electric motor, and the cam-piston type pump mechanism 5 is operated to suction and compress the oil in the oil tank 20 to generate pressure oil. The pressure oil generated by the pump mechanism 5a is fed under pressure to the spool valve mechanism 3 through the passage 22, and the pressure oil generated by the other pump mechanism 5b is forced into the cylinder 7 through the oil supply path 23. be done. The pressure oil fed to the spool valve mechanism 3 pushes the spool valve mechanism 3 upward against the spring 21. As the spool valve mechanism 3 rises, the steel ball 4 at the tip is inserted into and engaged with the communication passage valve seat 19a, closing the opening of the valve seat 19a. As a result, the communication path 1 that communicates the oil tank 20 and the cylinder 7
9 is blocked and occluded.

The pressure oil fed into the cylinder 7 acts on the piston head 16 and moves the piston head 16 and the piston rod 8 to the left in FIG. 1 against the return spring 28. As a result, the rack 8a moves forward and backward, the pinion 10a meshing with the rack 8a is rotated, and the rotating shaft 10 and the bending arm 9 fitted thereon are rotated in the direction of the arrow in FIG.
Due to this rotational movement of the arm 9, the reinforcing bar 18a is pushed by the bending roller 26 and bent so as to be wrapped around the outer periphery of the collar 13. During this bending operation, the reaction force against the pressing force of the bending roller 26 is supported by the collar 13 and the bending stopper 25. Further, the bending angle is determined by the stroke of the piston rod 8, and it is possible to perform a bending action of 180° or more if desired.

To prevent the bending arm 9 from rotating too much during this bending operation and bending the reinforcing bar 18a more than necessary, when the piston head 16 passes through the release hole 34, the pressure oil in the cylinder 7 is released into the release hole. 34 returns to the pressure buffer chamber 35 and the oil tank 20, and the piston head 16 and piston rod 8
stop further advancement of.

When the piston rod 8 stops moving forward and the bending arm 9 completes the bending operation, the electric motor stops operating. As a result, the supply of pressure oil from the pump mechanism 5 is stopped, and the spool valve mechanism 3
The steel ball 4 is pushed back downward by the spring 21.
The engagement of the valve seat 19a is released. The cylinder 7 and the oil tank 20 are communicated again through the communication passage 19, the pressure oil in the cylinder 7 is returned to the oil tank 20, and the piston flange 37 is pushed back to the right in FIG. 1 by the return spring 28. As a result, the rack 8a is pulled back rearward (rightward in FIG. 1), causing the pinion 10a to rotate. This action returns the arm 9 to its original position, ready for the subsequent bending action. The bent reinforcing bar 18a can be removed from the bent portion by pulling it out laterally.

When changing the bending radius of the reinforcing bar 18a, it can be adjusted by appropriately replacing the collar 13 having a plurality of diameters.

Subsequently, when cutting the reinforcing bar 18b, the reinforcing bar 18b to be cut is inserted between the fixed blade 12 and the cutting stopper 24. After setting the reinforcing bars 18b in this manner, the electric motor is rotated.

Pump mechanism 5 as in the case of reinforcing bar bending operation.
is driven, and the piston head 16 and piston rod 8 move to the left in FIG. By moving the piston rod 8 to the left, the reinforcing bar 18b is cut between the fixed blade 12 and the cutting stopper 24 and the movable blade 11.

After cutting the reinforcing bar 18b, by stopping the electric motor, the piston head 16 and the piston rod 8 are pushed back to the right in FIG. 1 by the return spring 28.

Note that the pinion 8a and the rack 10a are engaged with each other even during the reinforcing bar cutting operation, so that the bending arm 9 rotates. However, since the distance between the rotating shaft 10 and the fixed shaft 31 is considerably shorter than the distance between the rotating shaft 10 and the reinforcing bar 18b (L in FIG. 2), the rotation of the bending arm 9 may hinder the cutting operation. It won't happen.

〔Effect of the invention〕

As explained above, according to the present invention, since the bending function and the cutting function are simultaneously provided, there is no need to change the tool for each bending operation and cutting operation as in the conventional case. Therefore, the efficiency of on-site work can be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional side view of a bender cutter according to the present invention, and FIG. 2 is a view taken along the line shown in FIG. 1. 1...Casing body, 3...Spool valve mechanism, 5
...Pump mechanism, 7...Cylinder, 8...Piston rod, 9...Bending arm, 10...Rotating shaft, 11...Moving blade, 12...Fixed blade, 13...Rebar receiving collar, 16
...Piston head, 18...Reinforcing bar, 20...Oil tank, 2
4... Cutting stopper, 25... Bending stopper, 26...
bending roller.

Claims (1)

[Claims] 1. A piston head which is slidably disposed in the cylinder of the casing body by a hydraulic drive device and has a piston rod on the back surface with a rack formed thereon, and which is pivotally supported by the casing body in a direction perpendicular to the piston rod. and a rotating shaft having a pinion that meshes with the rack;
A bending arm is rotatably provided on the rotating shaft and has a bending roller at its tip, and a bending arm is attached coaxially with the rotating shaft to face the bending roller at the base end of the bending arm. a bending stopper attached to the casing body in a relationship facing the reinforcing bar receiver collar; a fixed blade and a cutting stopper attached to the tip of the piston rod and attached to the casing body; A bender cutter equipped with a movable blade that cuts the reinforcing steel between the .