JP2001038642A - Automatic fastening tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve efficiency by facilitating work, and to reduce a labor burden of an operator by installing a grip having the size suitable for gripping in a lower end part of a tool body, operating an auxiliary lever by fingers by gripping this grip, and interlocking and operating a switch lever. SOLUTION: In this tool body 1, an external shape of a grip 6 is about 45 to 50 mm, even a female operator can easily grip the grip 6, and fingers can also be sufficiently hooked on an auxiliary lever 7. This grip 6 is installed in a lower end part of the tool body 1, and a flange-like antislipping member 6a is integrally formed in the lower end part. Then, after pulling down the tool body 1 via the grip 6, the tool body 1 is pressed down by engaging a machine screw and a bolt with the tip of a tool 2, and when drawing the auxiliary lever 7 by fingers, an engaging part 7a draws a switch lever 4 to actuate the tool body 1 to thereby fasten the machine screw and the bolt by axially rotating the tool 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic tightening tool for efficiently tightening screws, bolts and the like.

[0002]

2. Description of the Related Art In an assembly plant, especially in a production line, an automatic tightening tool is used to efficiently tighten fasteners such as screws and bolts. This automatic tightening tool usually has a tool body 1 and a required tool 2 detachably attached to the lower end of the tool body 1 as shown in FIG. 5, and the tool body 1 has a drive source (not shown). The connected hose 3 is attached, and is held in a suspended state by a take-up reel 5 as shown in FIG. At the time of use, the operator grips the tool body 1 and lowers it to the working position,
The tip (lower end) of the tool is engaged with a screw or bolt (not shown) to be tightened, and the switch lever 4 attached to the tool main body 1 is operated by a finger to rotate the tool 2 to rotate the screw or bolt. Tighten. In this case, when the switch lever 4 is pulled toward the tool body 1, the tool lever 2 is turned on, the tool 2 rotates, and when the pulling force is released, the switch lever 4 is returned and turned off.

[0003]

According to the above-mentioned conventional automatic tightening tool, the following problems are pointed out. (1) The width W of the grip portion 1a of the tool main body 1 is approximately 60 mm, and since it is a square shape, it is difficult for a female worker to grip the entire finger without turning. (2) Since the tool main body 1 is hard to grasp, the force is not sufficiently applied, and hand slippage occurs, making it difficult to work. (3) It is difficult for a female worker to operate the switch lever because his / her finger is not sufficiently applied. (4) Since the grip portion 1a of the tool main body 1 is far from the tip of the tool 2, it is difficult for the tool 2 to engage with screws, bolts and the like and to be pressed down. (5) When the switch lever 4 is turned off, the tool body 1 is reversed by the reaction force and the hand becomes painful. (6) The work is performed by changing several types of automatic tightening tools having different weights. At that time, the take-up load of the take-up reel 5 is set according to the heaviest automatic tightening tool. You need great power. In addition, when the tool body 1 is pulled up by the take-up reel 5, the return speed of the tool main body 1 is too fast, the swing width is too large, or the tool body 1 collides with the take-up reel 5 or the like to generate an impact sound. there were.

[0004] For this reason, a heavy labor burden is applied particularly to female workers, and stiff shoulders, headaches, pains in the neck muscles,
Causes numbness in the hand. It is also difficult for male workers to work, which causes a decrease in efficiency. or,
Frequent lowering of the tool body 1 causes muscular fatigue, and when the tool body 1 is lifted by the take-up reel 5, the movement of the tool body 1 is disturbed, resulting in danger of injury and damage to the take-up reel 5 by collision. easy. As a solution, an automatic tightening tool has been developed in which the width of the grip portion of the tool body is reduced to make it easier to grip, but replacing all the existing equipment requires a large amount of expense. On the other hand, take-up reel 5
Can be solved to some extent by adjusting the spring force, but the adjustment operation is troublesome, and other appropriate solutions have not been found yet.

The present invention has been made in view of such a conventional situation, and provides an automatic tightening tool capable of solving all of the conventional problems by making a small change to an existing tool. With the goal.

[0006]

As a specific means for achieving this object, the present invention mounts a required tool on a tool body, grasps the tool body, and operates a switch lever mounted on the tool body. By doing so, in the automatic tightening tool that rotates the tool to tighten a screw, a bolt, or the like, a grip having a size suitable for gripping is attached to a lower end of the tool body, and the grip is gripped. The present invention provides an automatic tightening tool in which an auxiliary lever attached to the auxiliary lever is manually operated, and the switch lever engaged with the auxiliary lever can be operated in conjunction with the auxiliary lever. Also, in this automatic tightening tool, a reversing prevention member is attached to the outer surface of the grip, and at the time of tightening, the reversing prevention member is received by a palm to prevent reversal, and a non-slip member is provided at a lower end of the grip. The point is that it is provided.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an automatic tightening tool according to the present invention will be described in detail with reference to the accompanying drawings. The same members as those in the related art are denoted by the same reference numerals. In FIG. 1, reference numeral 1 denotes a tool main body, a required tool 2 is detachably attached to a lower end portion, a hose 3 is connected to an upper end portion, and a tool lever 2 is rotated by a switch lever 4 as in the related art. It is formed as follows.

Reference numeral 6 denotes a cylindrical grip made of nylon or the like, which is fixed to a lower portion of the tool body 1.
As shown in FIG. 2, the grip 6 is integrally formed with a flange-shaped non-slip member 6a at the lower end thereof. The non-slip member 6a is partially cut away so that the tip of the tool 2 is easily visible. A portion 6b is formed. Also, the grip 6
A mounting portion 6c for mounting the auxiliary lever 7 is formed, and a cutout hole 6d for a tool changing operation is provided at an upper portion.

Reference numeral 8 denotes a metal clamp member, which is formed in a substantially ring shape with a portion cut away, and whose three portions except for the notch portion 8a are attached to the upper end of the clip 6 by set screws 9 (FIG. 3). Fixed. The notch 8a has a through hole 8b formed in the lateral direction as shown in FIG.
and c are coaxially opposed to each other with the notch 8a interposed therebetween.

The grip 6 can be attached to the lower end of the tool body 1 via a clamp member 8. That is, as shown in FIG.
b, the set screw 10 inserted into the through hole 8b is screwed and fastened to the screw hole 8c, and the diameter of the clamp member 8 is reduced to fix the grip 6.

The grip 6 has an outer diameter of 45 to 50 mm,
Preferably, it is set to 48 mm. In the case of the present invention, the work is performed not by gripping the tool body 1 but by gripping the grip 6, so that a female worker can easily grip and work easily. By the way, as a result of an experiment using a dozen force meters with dozens of workers, it was found that the maximum gripping force was exhibited when the grip width (corresponding to the outer diameter of the grip) was in the range of 45 to 50 mm. In the case of 60 to 65 mm, the grip strength was significantly reduced.

As shown in FIGS. 2 and 3, the auxiliary lever 7 has a substantially L-shaped engaging portion 7a formed at the upper end and a rising piece 7b opposed to the lower end. Has a through hole 7
c and a notch 7d are formed respectively.

The auxiliary lever 7 is rotatably mounted on a mounting portion 6c of the grip 6 via a support shaft 11 and a return spring 12 within a certain range. The support shaft 11 is inserted from the cutout 6b side, inserted into the through hole 7c of the auxiliary lever 7, and screwed into a screw hole 6e provided in the mounting portion 6c as shown in FIG. The return spring 12 urges the auxiliary lever 7 inward by inserting it into the spring receiving hole 6f and pressing the lower end of the auxiliary lever 7. Therefore, the engaging portion 7a of the auxiliary lever 7
Is in contact with and engaged with the lower end of the switch lever 4 from the outside.

Reference numeral 13 denotes a resin-made inversion prevention member, which is shown in FIG.
As shown in FIG. 4, it is attached to the outer surface of the lower end of the grip 6 by a set screw 14, and when the tightening is completed, the inversion preventing member 13 is received by a palm to prevent inversion.

In FIG. 1, reference numeral 15 denotes a balance weight attached to the upper end of the tool main body 1, and the weight is set so as to be the same as another automatic tightening tool having a different weight to be replaced. By attaching the balance weight 15, the tool body 1 can be lowered with a small force at the time of work, even if an automatic tightening tool having a different weight is replaced and used. When being pulled up by the take-up reel 5 after the work, the return speed of the tool main body 1 can be reduced, the swing width can be reduced, and the impact noise due to collision can be prevented. Reference numeral 16 denotes a hook, and reference numeral 17 denotes an L / R switching lever.

The automatic tightening tool according to the present invention configured as described above operates while holding the grip 6 as shown in FIG. Even a female worker can easily grip the grip 6 and sufficiently put his finger on the auxiliary lever 7. Since the L / R switching lever 17 is not directly touched by a hand, a malfunction can be prevented.

At the time of work, the grip 6 is gripped and pulled down, but the balance weight 15 as described above requires only a small force. For example, since an automatic tightening tool having a weight difference of 0.66 kgf was replaced and used, the conventional tightening tool was not used.
A reduction force of about 96 kgf was required, but in this case, the reduction force may be about 0.3 kgf. 10 per day
Considering the number of reductions close to 00 or more, the labor burden will be significantly reduced.

A non-slip member 6a is provided at the lower end of the grip 6.
There is no hand slip when pulling down,
It can be reduced reliably. Also, take-up reel 5
As the anti-slip member 6a hits the palm against the lifting force of, the lowered state can be stably held.

After the tool main body 1 is pulled down via the grip 6, the tip of the tool 2 is engaged with a screw or a bolt and pressed down, and the auxiliary lever 7 is pulled by a finger. The tool body 1 can be operated by pulling the lever 4. At this time, since the non-slip member 6a has the cutout 6b, the tip of the tool 2 can be clearly seen through the cutout 6b, and the positioning with respect to the screw or the bolt can be easily performed. Furthermore, the position held by the hand is conventionally about 280 mm from the tip of the tool 2, but is about 150 mm in the case of the present invention, and is close to the tip of the tool 2. And the workability can be improved.

As shown in FIG. 3, when the auxiliary lever 7 is pulled by the finger F, the auxiliary lever 7 rotates around the support shaft 11, and the engaging portion 7a pushes the switch lever 4 to draw it as shown by the phantom line. That is, the switch lever 4 can be operated in conjunction with the auxiliary lever 7.

Thus, the tool 2 can be rotated about its axis to tighten screws, bolts and the like. As described above, since the auxiliary lever 7 is reliably pulled by the finger F, the switch lever 4 is reliably operated, and screws and bolts can be appropriately tightened without insufficient torque. Further, as described above, the tip of the tool 2 can be easily engaged with a screw, a bolt, or the like, and the pressing can be easily performed. Therefore, a fastening error due to the runout of the tool 2 can be prevented.

After the tightening, when the force of the finger F is released, the auxiliary lever 7 is pushed back outward by the restoring force of the switch lever 4, and rotates backward around the support shaft 11 to return to the original position. Since the notch 7d of the auxiliary lever 7 engages with the step 6g of the mounting portion 6c to perform a stopper function, the auxiliary lever 7 does not fall further outward. The switch lever 4 is also pushed back by the return mechanism (not shown), and rotates backward around the support shaft 4a to return to the original position. Thus, the rotation of the shaft of the tool 2 is stopped.

When the bolt is tightened, the grip 6 that is being gripped is about to flip instantly, but the grip 6 is prevented from being flipped because the flip prevention member 13 is received by the palm. Therefore, the wrist is not rotated due to the inversion, and disasters such as hand pain and tendonitis can be prevented beforehand. Since the inversion prevention member 13 is lightly contacted along the palm even during operation, there is an advantage that the wrist is stabilized and the operation is easy.

When the grip 6 is released after the work is completed, the grip 6 is lifted by the restoring force of the take-up reel 5. In this case, since the lifting weight is balanced by the balance weight 15, the tool body 1 with the grip 6 is attached.
Is slowly and quietly lifted. Therefore, the tool body 1 does not have such a problem that the return speed is too fast, the swing width is too large, or the tool body 1 collides with the take-up reel 5 or the like and generates an impact sound.

The exchange of the tool 2 with the tool body 1 is performed as follows.
It can be easily made from the outside by using the cutout hole 6d. Therefore, it is not necessary to attach and detach the grip 6 each time.

[0026]

As described above, according to the present invention,
In the automatic tightening tool, a grip with a width (outer diameter) that is easy to grasp is attached to the lower end of the tool body, and the switch lever of the tool body can be operated in conjunction with the auxiliary lever provided on the grip. Therefore, even a female worker can easily grip the grip, and the operation of the switch lever can be reliably performed because the auxiliary lever is sufficiently finger-operated. As a result, the work becomes easier and the efficiency is improved, and at the same time, excellent effects such as reducing the labor burden of the worker and eliminating work mistakes are obtained. Since the anti-slip member is provided at the lower end of the grip, hand slip does not occur when the grip is pulled down during work, and the lowered state is easily maintained. Also, an inversion prevention member is attached to the outer surface of the lower end of the grip, and the inversion is prevented by receiving the inversion prevention member with a palm at the time of tightening, so that no impact is applied to the wrist, so that hand pain and tendonitis can be prevented. Can be prevented. Furthermore, the balance weight was attached to the upper end of the tool body so that it would have the same weight as another automatic tightening tool with a different weight to be reworked. Prevents problems such as the return speed of the tool body being too fast, the swinging width being too large, or the impact of hitting the take-up reel, etc., when being pulled up by the take-up reel after work. It works. According to the present invention, since the present invention can be carried out immediately by making a small change to the existing tool body, there is an advantage that the capital investment does not increase.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing an embodiment of an automatic tightening tool according to the present invention.

FIG. 2 is an exploded perspective view of a grip.

FIG. 3 is a schematic sectional view of a main part showing a state at the time of work;

FIG. 4 is a schematic plan view of a main part of the same.

FIG. 5 is a perspective view of a main part showing a conventional example.

FIG. 6 is an explanatory view showing a state in which it is suspended by a take-up reel;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tool main body 2 ... Tool 3 ... Hose 4 ... Switch lever 5 ... Take-up reel 6 ... Grip 6a ... Non-slip member 7 ... Auxiliary lever 8 ... Clamp member 9, 10 ... Set screw 11 ... Support shaft 12 ... Return spring 13 ... Reversal prevention member 14 ... Set screw 15 ... Balance weight 16 ... Hook 17 ... LR switch lever

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kazuo Sugimoto 2500 Shinkai, Iwata City, Shizuoka Prefecture Yamaha Motor Co., Ltd. (72) Inventor Shigeki Yoshizawa 2500 Shinkai, Iwata City, Shizuoka Prefecture Yamaha Motor Co., Ltd.

Claims (3)

[Claims] 1. An automatic tool in which a required tool is attached to a tool body, and the tool is rotated by gripping the tool body and operating a switch lever attached to the tool body to tighten a screw or a bolt. In the tightening tool, a grip having a size suitable for grasping is attached to a lower end portion of the tool body, the grip is grasped, an auxiliary lever attached to the grip is operated by a finger, and the auxiliary lever is engaged with the grip. Automatic tightening tool that can be operated in conjunction with the switch lever. 2. The automatic tightening tool according to claim 1, wherein an inversion prevention member is attached to an outer surface of the grip, and the inversion is prevented by receiving the inversion prevention member with a palm during tightening. 3. The automatic tightening tool according to claim 1, wherein a non-slip member is provided at a lower end of the grip.