JPS63120085A - Bolt screwing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a bolt tightening machine for tightening bolts and nuts, and particularly to a bolt tightening machine for preventing incomplete fitting of a tip to an inner sleeve. Regarding.

(Prior art) Generally, in a bolt tightening machine, the tip of the bolt to be cut is fitted into the tip fitting part of the inner sleeve, and the outer sleeve fitted with the nut is rotated by the drive bag EE. Then, the nut is tightened against the same bolt, and when the nut is tightened by the outer sleeve, the reaction force is supported by the tip on the inner league side and the tip is sheared. In a bolt tightening machine, even if the tip is incorrectly fitted into the tip fitting part of the inner sleeve, the nut is still fitted into the nut fitting part of the outer sleeve.

(Problem to be Solved by the Invention) Therefore, in the above-mentioned bolt tightening machine, even if the tip is incorrectly fitted into the tip fitting part of the inner sleeve, the nut remains in the nut fitting part of the outer sleeve. The outer sleeve may be rotated when the inner sleeve or outer sleeve is rotated, and the tip or nut may be damaged and the bolt or nut may not be tightened properly, or the WAN of the inner sleeve or outer sleeve may be In addition, unexpected tightening can cause force to be applied to the operator via the tightening machine itself, causing accidents.

In view of the above-mentioned drawbacks, the object of the present invention is to provide a bolt.

When tightening the nut, if the nut and tip are incorrectly fitted to the outer sleeve and inner sleeve, the drive device that rotates the outer sleeve is prevented from driving to prevent the nut and tip from fitting properly. The object of the present invention is to provide a bolt tightening machine that can ensure proper tightening work and improve the safety of the work.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes an outer sleeve rotatably mounted on a main body housing and having a fitting portion for a nut to be tightened; The attachment includes an inner sleeve that has a fitting part for the cutting tip of the sabe bolt and is installed so that it can move forward and backward in the axial direction with respect to the outer sleeve, and an inner sleeve that is installed so that it can move forward and backward within the same inner sleeve. In the bolt tightening machine, the outer sleeve is rotated by a drive device to tighten bolts and nuts, and the housing includes an electric circuit between the drive device and the main switch of the drive device. Five switches are installed in the inner sleeve, and an actuating member that moves with the contact of the switch is tiltably provided near the switch, so that the actuating member and the chip removal rod in the inner sleeve can be interlocked. It was a collaboration.

(Function) In the present invention, the bolt is sometimes tightened, and when the chip is not fitted in the chip fitting part, the chip removal rod advances to turn off the switch of the drive device, and the chip is removed from the chip fitting part. When they are fitted, the operating member is tilted by the backward movement of the chip removal rod, and the switch is turned ON, which corresponds to the 0NIII operation by a trigger installed on the tightening machine body.

(Example) Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In the figure, 1 indicates the main body of the bolt tightening machine, and the main body 1
A cylindrical outer sleeve 2 is rotatably supported at the tip of the housing 1a, and the outer sleeve 2 has a polygonal square hole in which a nut N to be tightened is fitted at the tip of the inner diameter of the outer sleeve 2. A nut fitting part 3 is formed therein, and it is configured to be rotated by an electric motor 4 installed in the housing 1a of the main body 1 via a rotation transmission means. In the inner diameter portion of the outer sleeve 2, an engagement groove 5 of a predetermined width and depth is annularly recessed near the rear end (right end in the figure) of the nut fitting portion 3;
Further, at the rear of the engagement groove 5 (at the right end in the figure), a small-diameter inner diameter portion 6 and a large-diameter inner diameter portion 7 are continuously formed. Note that the rear end wall surface of the engagement groove 5 is used as a stopper surface 5a, and the corners with the small diameter inner diameter section 6 are chamfered on eight sides, and the corners between the small diameter inner diameter section 6 and the large diameter inner diameter section 7 are chamfered. Step part 7a
is formed into a tapered shape.

The cylindrical inner sleeve 8 is fitted into the inner diameter part of the outer sleeve 2, and its substantially rear end is inserted into a cylindrical support member 9 provided in the housing 1a, so that it extends in the axial direction. The tip fitting part 101n is formed in the shape of a polygonal square hole into which the depth P into which the bolt B to be tightened is to be cut is fitted. A flange 8a located within the large diameter inner diameter portion 7 of the outer sleeve 2 protrudes from approximately the center of the outer periphery, and the front end surface of the flange 8a is located within the large diameter inner diameter portion 7 of the outer sleeve 2.
It is formed in a tapered shape opposite to the stepped portion 7a in the inner diameter portion of. And the inner sleeve 8 is that 7 lunge 8
a spring 1 elastically loaded on the outer periphery between a and the support member 9;
1, the inner sleeve 8 is always biased forward so that its distal end portion is located approximately at the distal end of the nut fitting portion 3 of the outer sleeve 2, and in this biased state, the inner sleeve 8 is The tapered front end surface abuts against the stepped recess 7a within the inner diameter portion of the outer sleeve 2, preventing further movement in the forward direction.

Further, a through window 12 having a hook-shaped side cross section is provided almost at the tip of the inner sleeve 8, and this through window 12 is a square hole with one end communicating with the tip fitting part 10. and a groove portion 12b whose other end is open to the outer periphery of the inner sleeve 8 and faces the locking groove portion 5 of the outer sleeve 2.

The stopper 13, which is built into the through window 12 so as to be tiltable in a loosely fitted manner, has a hook-shaped side cross section, is located in the hole 12a of the through window 12, and has a hemispherical lower end. It consists of a base 13a formed in a shape, and a locking part 13b that integrally extends laterally from the base 13a and is located in the groove 12b of the through window 12. The arc-shaped protruding portion 14 is bulged, and the lower surface of the locking portion 13b is a tapered surface 15 that is inclined away from the bottom surface of the groove portion 12b, leaving a root portion attached to the base portion 13a. It does not have a tapered surface similar to the tapered surface 15, and the corner portion at the rear end is formed into an octahedral shape. A plate-shaped spring 16 is provided on the outside of the base 13a of the stopper 13 and is in contact with the protrusion 14 and is fitted around the outer periphery of the tip of the inner sleeve 8. Due to the biasing force of the spring 16, the stopper 13 always has a hemispherical lower end of its base 13a slightly protruding from the hole 12a of the through window 12 and facing into the chip fitting part 1o of the inner sleeve 8. The locking part 1
3b has a lower surface, with the root portion in contact with the bottom surface of the groove portion 12b of the through window 12, and the upper rear end thereof facing into the engagement groove portion 5 of the outer sleeve 2, so that the inner sleeve 8 can move forward and backward in the axial direction. (front approach FtJJ), especially backward movement (backward movement) is prevented. Therefore, the stopper 13
When the tip P to be cut of the bolt B to be tightened is fitted into the tip P, the base 13a of the tip P is attached to the spring 1.
While being pushed upward in the figure against the urging force of 6,
Due to this pushing-up action and the biasing force of the spring 16, the locking portion 1 comes into contact with the bottom surface of the groove portion 12b of the through window 12.
The lower surface of 3b is tilted clockwise in the figure using both the root portion and the protruding portion 14 of the base portion 13a that is in contact with the spring 16 as fulcrums, and the upper rear end of the locking portion 13b is connected to the engagement groove portion 5.
The inner sleeve 8 moves forward and backward in the axial direction w.
J (back and forth motion) is allowed.

A chip removal rod 1 is disposed within the inner diameter of the inner sleeve 8.
7 goes in the axial direction! ! The tip removal rod 17 is guided and supported by a guide ring 18 that is integrally fitted into the inner sleeve 8, and the tip of the rod 17 is usually guided and supported by a guide ring 18 that is integrally fitted into the inner sleeve 8. 8 is biased forward by a spring 19. Note that the rear end of the chip removal rod 17 faces a part of the inside of the bundle bousing 1b in the housing 1a of the tightening machine main body 1, and the guide ring 18 faces a part of the inside of the bundle bousing 1b of the housing 1a of the tightening machine main body 1, and the guide ring 18 Since the chip P is located toward the chip fitting portion 1o,
The fitting depth of the chip removal rod 17 and the forward protrusion of the chip removal rod 17 more than necessary are restricted.

The bundle bouncing 1b includes a trigger 21 that controls ON/OFF of the main switch 2o for starting the electric motor.
Further, a sub switch 23 is provided in the bundle bousing 1b via a bracket 22, and this sub switch 23 is connected to the main switch 2 as shown in FIG.
The electric motor 4 is installed in series with the electric motor 4 in the electric circuit. ' And, in the vicinity of the sub switch 23, an approximately oval-shaped actuating member 24 is tiltably supported at its bent portion by a support pin 25, and one actuating piece 2 of the actuating member 24
ta is opposed to the contact 23a of the sub switch 23,
The other actuating piece 24b is located on the movement locus of the chip removal rod 17, and its side end is located on the movement trajectory of the chip removal rod 17.
It is configured so that it can be easily linked with 7. Thus, the actuating member 24 is 4! of the chip removal rod 17! ! When leaving work, the shaft end of the chip removal rod 17 is connected to the other actuating piece 24.
By riding on the same actuating piece 24b and pushing down the same actuating piece 24b, it is tilted using the support pin 25 as a fulcrum, and one of the actuating pieces 24
a pushes the contact 23a of the sub switch 23 to turn on the sub switch 23, and when the chip removal rod 17 is in the advanced state, the n1 switch 23 is reset and activated by the biasing means built into the contact 23a itself. The member 24 is returned to its original state and the sub switch 23 is turned OFF.
This is to put it in the F state.

This embodiment is constructed as described above, and its operation will be explained next.

Now, regarding the bolt B and nut N to be tightened, the tip P of the bolt B is attached to the tip fitting part 10 of the inner sleeve 8.
As the inner sleeve 8 is fitted, the inner sleeve 8 is moved slightly backward against the biasing force of the spring 11 due to the frictional resistance between the two due to this fitting operation, but as the inner sleeve 8 moves back and forth, the stopper Since the rear end upper part of the locking part 13a of the outer sleeve 2 comes into contact with the stopper surface 5a of the rear end wall surface of the engagement groove part 5 of the outer sleeve 2, the inner sleeve 8
will be prevented from leaving work. In this case, a slight gap is formed between the flange 8a of the inner sleeve 18 and the stepped portion 7a of the outer sleeve 2.

(See Figures 3 and 4.) When the tip P is further fitted into the tip fitting portion 10 until it comes into contact with the guide ring 18, this depth P causes the base 13a of the stopper 13 to move against the spring 1.
It is pushed upward in the figure by the urging force of 6, and
Due to this pushing-up action and the biasing force of the spring 16, the locking portion 1 comes into contact with the bottom surface of the groove portion 12b of the through window 12.
The lower surface of 3b is tilted clockwise in the figure using both the root portion and the protruding portion 14 of the base portion 13a that is in contact with the spring 16 as fulcrums, and the upper rear end of the locking portion 13b is connected to the engagement groove portion 5.
Since the inner sleeve 8 is separated from the stopper surface 5a and this state is maintained, the inner sleeve 8 is allowed to move back and forth in the axial direction. When the stopper 13 is tilted,
Since the upper rear end of the locking portion 13a of the stopper 13 is in contact with the stopper surface 5a on the rear end wall surface of the engagement groove portion 5 of the outer sleeve 2, the inner sleeve 8 is pushed slightly forward when the stopper 13 is tilted. This allows the tilting movement. (See FIG. 5) When the chip P is fitted, the chip removal rod 17 is moved backward against the biasing force of the spring 19.

In the above state, the nut N to be tightened is fitted into the nut fitting portion 3 of the outer sleeve 2, and as the nut N is fitted, the inner sleeve 8
is moved backward in the axial direction against the biasing force of the spring 11, allowing the nut N to fit into the nut fitting portion 3.

On the other hand, as described above, when the tip removal rod 17 moves backward, the rear end of the tip removal rod 17 rides on the other actuation piece 24b of the actuating member 24 and pushes down the actuating piece 24b. is tilted clockwise in the drawing with the support pin 25 as a fulcrum, and one operating piece 24 a lf
i Push in the contact 23a of the E1 switch 23 to turn on the sub switch 23.

Then, in a state in which the nut N is fitted into the nut fitting part 3, the electric motor 4 is driven by turning on the main switch 20 using the trigger 21, thereby rotating the outer sub 2 and the bolt B and It is used to tighten the nut N, and when the predetermined tightening is completed, the tip P fitted into the tip fitting portion 10 of the inner sleeve 8 is cut off from the shaft portion of the bolt B, and the predetermined tightening is completed. do. When this cut chip P is removed from the chip fitting part 10 by the chip removing rod 17 which is moved forward by the pushing force of the spring 19, the fitting of the nut fitting part 3 to the nut N is released. As a result, the inner sleeve 8 is returned to its original state by the urging force of the spring 11, and the push-up force of the stopper 13 by the tip P is released, so that the inner sleeve 8 is returned to its original state by the urging force of the spring 16 and its engagement is released. The stop portion 13b is located within the engagement groove portion 5 of the outer sleeve 2.

On the other hand, as described above, the chip removal rod 17 is also moved forward by the biasing force of the spring 19 and returned to its original state. When the contact 23a returns, it is returned to its original state by a biasing means built into the contact 23a itself. By this, the sub switch 2
3 is turned off.

In this embodiment, if the tip P is incorrectly fitted into the tip fitting part 10 of the inner sleeve 8, the stopper 13 will not be tilted by the tip P, so the locking part of the stopper 13 will not be tilted. 13b and the stopper surface 5a of the engagement groove 5 of the outer sleeve 2 is maintained, the movement of the inner sleeve 8 in the axial direction is prevented and the nut N is prevented from moving into the nut fitting part 3 of the outer sleeve 2. This prevents the fitting, and furthermore, if the tip P is incorrectly fitted into the tip fitting portion 10, the tip removal rod 17, which should be retracted by the tip, will not be retracted in the correct condition. The ON operation of the 11 switch 23 by the operating member 24 is not performed. Therefore, even if the main switch 20 is turned on by the trigger 21, the electric motor 4 is not driven.

As shown in FIGS. 10 and 11, the actuating member 24 in this embodiment has a flat surface 24c that comes into contact with the side of the chip removal rod 17 and the contact 23a of the sub switch 23.
It is also possible to use an opening-shaped actuating member 24d on the right side, which can be tilted.

(Effects) As described above, the present invention has an outer sleeve that is rotatably mounted on the main body housing and has a fitting portion for a nut to be tightened, and a bolt for cutting a bolt to be tightened. an inner sleeve that has a fitting portion for a chip and is installed so that it can move forward and backward in the axial direction within the outer sleeve, and a chip removal rod that is installed inside the inner sleeve so that it can move forward and backward. A bolt tightening machine that tightens bolts and nuts by rotating the outer sleeve with a drive device, wherein a switch is provided in the housing to be incorporated into an electric circuit between the drive device and a main switch of the drive device, An actuating member that cooperates with the contact of the switch is provided in a tiltable manner near the switch, and the actuating member and the chip removal rod in the inner sleeve are linked together so that the tip is retracted. The chip removal rod tilts the operating member, and this operating member turns the switch on and off, so unless the switch is turned on by the operating member, the drive device will not be driven even if the main switch is turned ON.
Therefore, proper fitting between the nut and the tip can be ensured, and work safety can be greatly improved.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a side sectional view of the main part showing the stopper part, Fig. 2 is a side sectional view of the main part showing the bundle bousing part, and Figs. 6 is a sectional view taken along line A-A in FIG. 1, FIG. 7 is a sectional view taken along line B-B in FIG. 1, and FIG. 8 is a sectional view taken along line C in FIG. 7. −
9 is a sectional view taken along line C, FIG. 9 is an electric circuit diagram, FIG. 10 is a sectional view showing the actuating members separately, and FIG. 11 is a perspective view. 1a... Housing 2... Outer sleeve 3... Nut fitting part 4... Electric motor 8
... Inner sleeve 10 ... Dep fitting part 17
...Chip removal rod 20...Main switch 23.
・・Sub switch 24・・Operating member Applicant: Makita Electric Works Co., Ltd. Agent: Patent attorney: Oka 1) Hidehiko (3 others)゛$8 Figure 11

Claims (1)

[Claims] An outer sleeve is rotatably mounted on the main body housing and has a fitting part for a nut to be tightened, and a fitting part for a tip to be cut of a bolt to be tightened, and has an outer sleeve that is rotatably installed in the outer sleeve. An inner sleeve is provided so as to be movable forward and backward in the axial direction, and a chip removal rod is provided within the inner sleeve so as to be movable forward and backward, and the outer sleeve is rotated by a drive device to tighten bolts and nuts. In the bolt tightening machine, a switch is provided in the housing to be incorporated into an electric circuit between the drive device and a main switch of the drive device, and an actuation member that cooperates with a contact of the switch is provided near the switch. 1. A bolt tightening machine, wherein the bolt tightening machine is tiltable, and the operating member and the chip removal rod inside the inner sleeve are linked together.