JP2001150360A - Fastening tool of reinforcing bar joint fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastening tool capable of surely rotating a lock nut and a coupler C to fasten them. SOLUTION: This fastening tool is composed of a forward and reverse driving motor 2, a rotating mechanism, a gear mechanism and a stopping mechanism. In the rotating mechanism, a rotary gear 5 is coaxially held between a pair of upper and lower slide metals 6 curved by cutting their front surfaces by approximately 70-80 deg., and rotated while sliding thereon, and a supporting member 7 is mounted on the rotary gear 5. A collet 8 having an internal size corresponding to the lock nut R and the coupler C of a joint fitting of various reinforcing bars F different size is fitted to the supporting member 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool for fastening a joint for connecting a reinforcing bar of a reinforced concrete structure.

[0002]

2. Description of the Related Art In a reinforced concrete structure, a reinforcing bar is stretched in concrete so that the concrete exhibits a predetermined strength. Since the material rebar is formed to a certain length, if a longer rebar is needed, it is made to the desired length by connecting in order with a joint fitting consisting of a pair of lock nuts and couplers . That is, the reinforcing bar F used at a place where such a long reinforcing bar is required has a male screw L2 having a length of about 2.5 to 3.5 times the nominal diameter of the reinforcing bar F at one end (short screw side). And the other end (long screw side) is further equipped with 1.
A male screw L1 approximately five times as long is provided. When the reinforcing bars F are stretched, a lock nut R2 is screwed into the base end of the male screw L2 on the short screw side of each reinforcing bar, and the lock nut R2 is screwed on the base end of the male screw L1 on the long screw side.
1 and then coupler (cylindrical female screw) C
Are screwed together, and a predetermined number of reinforcing bars F are spaced apart by about 3 to 5 mm, and the short screw side end and the long screw side end face each other and are successively arranged. Next, the coupler C is rotated in the returning direction at each connection point, and screwed into the male screw L2 facing the coupler C. When the coupler C reaches the middle position between the two rebars F, F, the lock nuts R1 and R
Tighten 2 and then connect the rebars and join them.

[0003]

In a long structure in which a plurality of rebars are connected and stretched, at least several hundreds of rebars are used, and the number of connection points is several hundred or more. By the way, in a concrete structure, reinforcing bars are arranged in a mesh at intervals of about 200 mm or less. For this reason, when the coupler or the lock nut is to be rotated by a rotating tool such as a wrench that swings itself, there is a problem that the work efficiency is extremely low because the adjacent reinforcing bar is in the way. From this, this work,
An operator has turned the coupler and the lock nut directly by hand and moved them to a predetermined position, and then performed only the final tightening using a wrench. Therefore, this work requires a lot of manpower and time because the workability is low and the number of processes is large.
Workers injured their arms and hands. In addition, there has been a problem that the connection of the reinforcing bars is insufficient and the concrete cannot have a predetermined strength. As a measure to solve such a problem, the present inventor attaches a rotating roller to the tip of the fastener body, positions a receiving roller in front of the rotating roller, rotates the rotating roller by a drive motor, and uses a handle for the receiving roller. It is configured to be pulled toward the front, and the receiving roller is inserted into the rear side of the coupler C or lock nut of the rebar joint fitting and pulled toward the front, so that the coupler C or the like is sandwiched between the rotating roller and the receiving roller. Thus, a fastening tool configured to rotate the rotating roller to rotate the coupler C and the like has been invented, and the patent application has already been filed (Japanese Patent Application No. 10-0677).
No. 50). This fastener has the function of rotating the joint fitting. The lock nut has a hexagonal outer shape, and the coupler C is almost hexagonal to octagonal. It is extremely difficult to rotate between the roller and the roller, and a roller having a certain sliding resistance with the male screw slips between the rotating roller and the receiving roller and has a problem that it cannot be strongly tightened. In the present invention, the lock nut and the coupler C are surely rotated,
It is intended to provide a tightening tool that can be tightened.

[0004]

The present invention comprises a forward / reverse rotation drive motor 2, a rotating mechanism, a gear mechanism, and a stop mechanism. The rotating mechanism is configured such that the rotating gear 5 is concentrically sandwiched between a pair of upper and lower slide metals 6 formed in a bay shape by cutting the front surface by about 70 to 80 °, and is rotated while being rotated. The support member 7 is attached. The above-mentioned object is attained by arranging the collet 8 having a shape corresponding to the shape of the lock nut R and the coupler C of the joint metal fittings of the various reinforcing bars F having different sizes on the inside to the support member 7. ing. Main gear 24
A pair of left and right transmission gears 25 connecting the rotating gear 5 and the rotating gear 5 can be constituted by two gears each having a small diameter.

[0005]

According to the present invention, since the collet 8 is formed separately from the support member 7, the collet 8 having an inner shape adapted to the dimensions of the target Johnt fitting is selectively used.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a fastener for a metal joint of a reinforcing bar according to the present invention.
In this embodiment, the collet 8 is made detachable so that a collet suitable for the size of the joint fitting can be used, and the main gear 24 and the rotating gear 5 can be used.
The pair of transmission gears 25 connecting left and right is constituted by two gears each having a small diameter, so that outward projection is suppressed. In the figure, reference numeral 1 denotes a housing, in which a forward / reverse drive motor 2 is accommodated at a base end side, and a rotating mechanism is attached at a tip end side. The forward / reverse rotation drive motor 2 and the rotating mechanism are connected by a gear mechanism, and a stop mechanism is additionally provided thereto.
The collet 8 is configured to be stopped at a fixed position. A handle 3 is provided at the base end of the housing 1.
A handle 4 is mounted at an intermediate position. The handle 3 is gripped by one hand and the handle 4 is gripped by the other hand to operate the aircraft. Although the drive motor 2 is not shown in detail in the drawing, an air motor is used in this embodiment, and a trigger switch 31 and a forward / reverse switching button 32 are attached to the handle 3. The switching between forward and reverse rotation and the operation of starting and stopping can be performed. The rotating mechanism includes a rotating gear 5, a pair of upper and lower slide metals 6, and a support member 7, and a collet 8 is fitted to the rotating gear 5. Slide metal 6 has front 7
The upper part is attached to the upper surface plate 11 of the housing 1, and the lower part is attached to the lower surface plate 12 of the housing 1. The front side edge is the side plate 13 of the housing 1.
Supported by The rotating gear 5 is concentrically held between the upper and lower slide metals 6 and 6 and rotates while sliding. Also, the rotating gear 5
The supporting member 7 is attached to the rotative gear 5 by an attaching pin 71 so as to rotate integrally with the rotating gear 5. The rotation gear 5 is partially 70 to 8 like the slide metal 6.
It is a C-shaped ring gear cut out by about 0 °, the support member 7 also has substantially the same inner diameter shape, and the support member 7 is attached so that its cutout portion matches the cutout portion of the rotary gear 5. I have. The collet 8 is also a cylindrical body partially cut away by about 70 to 80 °, and is formed so that its outer diameter is substantially the same as the inner diameter of the support member 7 and fits into the support member 7. 7, and the notch portion is aligned with the notch portion of the support member 7 and fixed by the fixing pin 72. The inside of the collet 8 is prepared with dimensions corresponding to the lock nut R and the coupler C of the joint fittings of various reinforcing bars F having different sizes, and an appropriate one according to the size of the target joint fitting is provided. Select and fit. The gear mechanism is a drive gear 21
And a bevel gear 22, an intermediate gear 23, a main gear 24, and a pair of left and right transmission gears 25. The drive gear 21 is attached to a drive shaft of the drive motor 2 and meshes with a main gear 24 via a bevel gear 22 and an intermediate gear 23. The transmission gear 25 is located between the main gear 24 and the rotation gear 5, and transmits the rotation of the main gear 24, that is, the rotation of the drive motor 2 to the rotation gear 5, and rotates the rotation. It is made to let. The two transmission gears 25 are constituted by two small-diameter gears so as to suppress outward protrusion. A semicircular locking claw 91 is attached to the spindle of the main gear 24, and a stopper 92 is loosely fitted to the spindle of the intermediate gear 23, and as shown in FIG. When the (collet 8, support member 7, and cutout portion of the rotating gear 5) is rotated to a position facing forward, it functions as a stopper for stopping the same at that position.
That is, the locking claw 91 is configured to rotate integrally with the support shaft of the main gear 24, and the stopper 92 is located on the center line when no load is applied by a coil spring (not shown). It is connected to an operation knob 93 protruding upward, and is rotated left and right about the support shaft by several mm by moving the operation knob 93 left and right. The distance between the left and right toes of the stopper 92 is slightly wider than the outer diameter of the locking claw 91 and reaches both sides of the support shaft of the main gear 24. When this is located on the center line, the toe is locked. Is located outside the rotation trajectory of the claw 91,
The stop function is not exerted, so that when it is turned to the left or right by about several mm, its toe enters the rotation orbit of the locking claw 91 and engages with the locking claw 91 to stop the rotation. It has become.

When tightening the reinforcing metal joint,
As shown in FIG. 2, the collet 8 is fitted to the lock nut R or the coupler C, and the drive motor 2 is rotated in a desired direction to rotate the collet 8 to move it forward and backward.
Next, by operating the operation knob 93, the stopper 92 is engaged with the locking claw 91, and the drive motor 2 is rotated. Then, when the collet 8 rotates to the position shown in FIG. 2, the locking claw 91 engages with the stopper 92 and stops, and the lock nut R and the coupler C become free with respect to the collet 8. Therefore, the rotation of the drive motor 2 is stopped, and the fastener is removed from the joint fitting.

As shown in FIGS. 1 to 3, when the notch portion of the collet 8 is directed forward, the collet 8 is pressed toward the reinforcing bar F (more specifically, the body side of the collet 8). Is pressed against the lock nut R and the coupler C). As a result, this "inner surface on the body side"
Is a reference for positioning the collet 8 such as the coupler C,
This is located at the center of rotation of the collet 8. However, the collet 8 is 90 to 270 degrees from the position shown in FIG.
During the rotation of the range, the cutout portion shifts, and the surface on the main body side changes to the cutout portion. As a result, the coupler C or the like loses the reference for positioning, and enters a state where it can move toward the cutout portion. When performing the tightening operation, the tightening tool is pressed slightly in the direction of the rebar F and the operation is performed. Since the coupler C and the like are fixed at a fixed position, while the collet 8 rotates from 90 ° to 180 °. When the fastener body moves forward and further passes through 180 °, it gradually retracts and returns to its original position when rotated to 270 °. Therefore, when the tightening operation is performed, the tightening tool main body vibrates back and forth.

FIGS. 4 to 6 show a vibration suppressing member 81 having the same inner edge curvature as the inner peripheral curvature of the collet 8 attached to the main body of the fastener. Thus, while the collet 8 rotates in the range of 90 to 270 °, the shake suppressing member 81 functions instead as a reference for positioning the coupler C and the like, and suppresses the shake of the coupler C and the like.

[0010]

As described in detail above, in the fastener for the rebar joint fitting according to the present invention, the rotating mechanism slides by holding the rotating gear 5 concentrically between a pair of upper and lower slide metals 6. The collet 8 can be attached and detached by attaching the support member 7 to the support member 7 and fitting the collet 8 to the support member 7. As a result, the inner side of the collet 8 can be formed in a desired shape, so that the inner side is prepared in advance in a shape corresponding to the lock nut R and the coupler C of the joint metal fittings of various reinforcing bars F having different sizes. In addition, there is an effect that a fitting suitable for the target joint fitting can be selected and used. The pair of left and right transmission gears 25 that connect the main gear 24 and the rotating gear 5 is formed of two small-diameter gears, respectively, so that the overhang of the gears is suppressed and the workability is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a fastener for a rebar joint fitting according to the present invention.

FIG. 2 is a partially cutaway plan view of the same.

FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 4 is a plan view showing a state in which a shake suppressing member is attached.

FIG. 5 is a central vertical sectional view of the same.

FIG. 6 is a central longitudinal sectional view showing a state where the collet is rotated by 180 °.

FIG. 7 is an explanatory view showing a state where a joint fitting is attached to a reinforcing bar.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Drive motor 3 Handle 4 Handle 5 Rotating gear 6 Slide metal 7 Support member 8 Collet 11 Upper surface plate 12 Lower surface plate 13 Side plate 21 Drive gear 22 Bevel gear 23 Intermediate gear 24 Main gear 25 Transmission gear 31 Trigger switch 32 Positive Reverse switching button 71 Mounting pin 72 Fixing pin 81 Runout suppressing member 91 Locking claw 92 Stopper 93 Operation knob

Claims (3)

[Claims] 1. A fastening tool comprising a forward / reverse rotation drive motor, a rotation mechanism, a gear mechanism, and a stop mechanism, wherein the rotation mechanism comprises a pair of upper and lower parts formed by cutting a front surface by about 70 to 80 ° to form a bay shape. The rotating gear is concentrically held between the slide metals so as to rotate while sliding, and a supporting member is attached thereto, and a collet is fitted to the supporting member. Fasteners for rebar joint fittings. 2. The gear mechanism comprises a drive gear, a bevel gear, an intermediate gear, a main gear, and a pair of left and right transmission gears, each of which is constituted by two small-diameter gears. The fastener for a reinforcing metal joint according to claim 1. 3. The reinforcing bar according to claim 1, wherein a vibration suppressing member having an inner edge curvature equal to an inner peripheral curvature of the collet is mounted on the collet of the fastener body. Fastener for joint fittings.