JPH11114847A - Thread fastening equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance safety of thread fastening work by avoiding a risk, unintentionally nipping fingers. SOLUTION: This equipment is constituted so that the equipment may be actuated by supplying power to an equipment body 10 from a power source. In this case, the equipment is provided with an opening and closing part 13 capable of shutting down the power and formed on power transmission means 11, 15 for connecting the power source to the equipment body 10, and an opening and closing operating part 17 for operating shutdown of power supply to the opening and closing part 13. The opening and closing part 13 and the opening and closing operating part 17 are placed at different positions, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw tightening device used in general fastening work, and more particularly to a screw tightening device capable of fastening and removing bolts and nuts.

[0002]

2. Description of the Related Art Conventionally, a bolt fastening device using a screw fastening device is roughly classified into a manual type and a power type. Of these, the power type bolt fastening device is mainly a device as shown in FIG. It comprises a main body 1, an operation section 2 provided on the apparatus main body 1 for operating supply and cutoff of power from a power source, and a reaction force receiver 3 abutting on a reference surface provided on the apparatus main body 1. ing. When fastening a bolt using this power type bolt fastening device, the operator grips the operation unit 2 with his dominant arm,
The user was working while supporting a part of the apparatus body 1 with the opposite hand.

[0003]

However, in the above-mentioned conventional power type bolt fastening device, when the operating portion 2 is pressed, the device main body 1 operates. It operates even when the receiver 3 is touched.

The reaction force receiver 3 is used by being applied to a certain reference surface as described above, and receives a tightening torque generated by the bolt fastening device itself. Therefore, when the operation unit 2 is pressed while touching the reaction force receiver 3, there is a risk that a finger may be caught between the reference surface and the reaction force receiver 3 due to the generated torque, resulting in injury.

The present invention has been made in consideration of the above circumstances, and has as its object to provide a screw tightening device that avoids the risk of being pinched by mistake and improves the safety of screw tightening work. I do.

[0006]

In order to solve the above-mentioned problems, a first aspect of the present invention relates to a power-type screw tightening device which operates by being supplied with power from a power source to the apparatus main body. An opening / closing unit configured to be able to shut off the power, and an opening / closing operation unit that operates to shut off the power supply to the opening / closing unit, on a power transmission unit that connects the device body and
The opening / closing section and the opening / closing operation section are arranged at different positions.

According to a second aspect of the present invention, the power source according to the first aspect is pneumatic, and the opening / closing section includes a pilot-operated switching valve and a human-operated switching valve connected in series, while the opening / closing operation section includes: Is characterized by having a manually operated switching valve for opening and closing the pilot operated switching valve.

According to a third aspect of the present invention, the power source according to the first aspect is electric power, the opening / closing section and the opening / closing operation section both include pushbutton switches, and these pushbutton switches are electrically connected in series. It is characterized by.

A fourth aspect of the present invention is characterized in that a portion for housing the opening / closing operation unit according to the first aspect is formed in an elliptical cross section, and a non-slip mechanism is provided on the surface thereof.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing an embodiment of a screw tightening device according to the present invention, and FIGS. 2 (A), (B) and (C) are FIGS.
Side view, sectional view, plan view showing the grip of FIG.
FIG. 4 is an air circuit diagram of the screw fastening device of FIG. The screw tightening device of the present embodiment uses air pressure as a power source.

As shown in FIG. 1, the apparatus main body 10 has a power connection portion 11 as a power transmission means. The power connection portion 11 has a power supply portion 12 for supplying air as power from a power source (not shown). Is connected to The power connection unit 11 is connected to an air valve 13 as an opening / closing unit that shuts off the supplied power.

The air valve 13 is a pilot-operated switching valve, which normally closes the power path, and opens the power path by a separately prepared operation input. The air valve 13 is connected to the apparatus main body 10 to transmit power.

On the other hand, the apparatus body 10 includes an air valve 13.
An opening / closing part different from the above is built in, and this opening / closing part is connected in series with the air valve 13. The opening / closing section is a manually operated switching valve, and normally has a structure in which the power path is closed but opened by pressing the operation button 14.

One end of an air tube 15 as power transmission means is connected to the power connection portion 11, and the other end of the air tube 15 is opened and closed by a grip 16 mounted on the apparatus main body 10. It is connected to a mechanical valve 17 as a part. The mechanical valve 17 is a manually operated switching valve, and is an air valve 1.
3 pilot operation.

The grip 16 is shown in FIGS.
As shown in (C), the cross-section is formed into an elliptical shape, and a step 16a (or a knurl may be formed) is formed on the surface thereof to constitute a non-slip mechanism that is hard to slip against sweat and the like.

The mechanical valve 17 built in the grip 16 opens and closes the power path for the pilot when the safety button 18 moves along the guide groove 16 b formed in the grip 16 by the spring 19.

As shown in FIG. 3, when the mechanical valve 17 is opened, the power supplied through the power connection 11 and the air tube 15 is opened and closed via the return air tube 15. The power path of the air valve 13 is opened.

In this embodiment, the reaction force receiver 20 is provided on the apparatus main body 10 and abuts against a certain reference surface.

As described above, in the present embodiment, the air valve 13 is provided on the power connection portion 11 and the air tube 15 as power transmission means for connecting the power source and the apparatus main body 1 so that the air pressure from the power source can be shut off. And this air valve 1
Mechanical valve 17 that operates to shut off power supply to 3
Are provided, and the air valve 13 and the mechanical valve 17 are provided.
Are arranged at different positions.

The operation of the present embodiment having the above configuration will be described.

When the power supply unit 12 and the power connection unit 11 are connected, power is transmitted to the air valve 13 and the mechanical valve 17. Here, unless the safety button 18 is pressed, both the air valve 13 and the mechanical valve 17 close the power supply path, so that the power does not reach the apparatus main body 10. Therefore, even if the operation button 14 of the apparatus main body 10 is pressed as in the related art, the power screw driving device does not operate.

However, when the safety button 18 is pressed,
The power path for the pilot of the mechanical valve 17 opens,
The power path of the air valve 13 is opened via the air tube 15. As a result, the motive power is transmitted to the apparatus main body 10, and by pressing the operation button 14 here, the motive power screw tightening apparatus operates. However, since the power path only opens while the operation button 14 and the safety button 18 are pressed,
In order to operate the power screwdriver, the respective buttons 14, 18 must be pressed with both hands.

As described above, according to the present embodiment, the apparatus main body 10 does not operate unless the air valve 13 and the mechanical valve 17 are arranged at different positions and the operation button 14 and the safety button 18 are pressed with both hands. Therefore, since it does not operate when touching a place where there is a problem in safety such as the reaction force receiver 2 which had a problem in the conventional example,
The safety of the bolting operation itself is improved. In addition, by adopting a non-slip structure for preventing the hand from slipping on the grip 16, it is possible to reduce dangerous factors such as slipping of the hand as in the related art.

FIG. 4 is an electric circuit diagram showing a modification of the embodiment of the screw fastening device according to the present invention. Note that the same or corresponding parts as those of the above embodiment are denoted by the same reference numerals and described.

In this modification, as shown in FIG. 3, electric power is used as a power source, an air valve 13 as an opening / closing unit is provided with an operation button switch 21, and a mechanical valve 17 as an opening / closing operation unit is secured. A button switch 22 is provided, and these switches 21 and 22 are electrically connected in series.

In the screw tightening device having such a configuration, in order to transmit electric power, which is power, to the device, the operation button switch 21 and the safety button switch 22 which are separately provided at two different safe positions are provided. It is necessary to press both sides, and it is possible to avoid the danger of the finger being erroneously pinched as described above.

[0028]

As described above, according to the first aspect of the present invention,
According to this, in a power type screw tightening device that operates by being supplied with power from a power source to the device body, an opening / closing unit configured to be capable of shutting off power on a power transmission unit connecting the power source and the device body, By providing an opening / closing operation section for operating to shut off the power supply to the opening / closing section, and arranging the opening / closing section and the opening / closing operation section at different positions respectively, during the screw tightening work in which the main body of the apparatus is operated, the conventionally most fundamental operation is performed. It is possible to avoid the danger of a finger being accidentally pinched, which is a risk factor, and to improve safety.

According to a second aspect of the present invention, the power source according to the first aspect is pneumatic, and the opening / closing section has a pilot-operated switching valve and a human-operated switching valve connected in series, while the opening / closing section has an open / close operation section. Is equipped with a manually operated switching valve that opens and closes a pilot operated switching valve.In order to transmit air pressure, which is power, to the device main body, a manually operated switching valve disposed at a different position is used. It is necessary to perform the operation, and it is possible to avoid the danger of the finger being erroneously pinched as described above.

According to a third aspect of the present invention, the power source according to the first aspect is electric power, the open / close section and the open / close operating section are both provided with pushbutton switches, and these pushbutton switches are electrically connected in series. Therefore, in order to transmit power, which is power, to the apparatus main body, it is necessary to press pushbutton switches arranged at different positions, thereby avoiding the danger of a finger being erroneously pinched as described above. Can be.

According to the fourth aspect, the portion for accommodating the opening / closing operation portion according to the first aspect is formed to have an elliptical cross section, and a non-slip mechanism is provided on the surface thereof. You can avoid the dangers of injury by gripping a part of your hand and slipping.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a screw fastening device according to the present invention.

2A, 2B, and 2C are a side view, a cross-sectional view, and a plan view showing the grip of FIG. 1;

FIG. 3 is an air circuit diagram of the screw fastening device of FIG. 1;

FIG. 4 is an electric circuit diagram showing a modification of the embodiment of the screw fastening device according to the present invention.

FIG. 5 is a front view showing a bolt fastening device using a conventional power type screw fastening device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Device main body 2 Operation part 3 Reaction force receiver 10 Device main body 11 Power connection part (power transmission means) 12 Power supply part 13 Air valve (opening / closing part) 14 Operation button 15 Air tube (power transmission means) 16 Grip 16a Step (Slip prevention) Mechanism) 16b guide groove 17 mechanical valve (opening / closing operation part) 18 safety button 19 spring 20 reaction force receiving 21 operation button switch 22 safety button switch

Claims (4)

[Claims] 1. A power type screw tightening device that operates by being supplied with power from a power source to an apparatus main body, wherein the power is cut off on a power transmission unit that connects the power source and the apparatus main body. A screw tightening device, comprising: an opening / closing section, and an opening / closing operation section for operating to shut off power supply to the opening / closing section, wherein the opening / closing section and the opening / closing operation section are arranged at different positions. 2. The power source is pneumatic, and the opening / closing section is connected in series with a pilot-operated switching valve and a human-operated switching valve, while the opening / closing section is connected to the pilot-operated switching valve. 2. The screw fastening device according to claim 1, further comprising a manually operated switching valve that opens and closes the valve. 3. The system according to claim 1, wherein the power source is electric power, the opening / closing section and the opening / closing operation section each include a pushbutton switch, and the pushbutton switches are electrically connected in series. The screw tightening device as described. 4. The screw tightening device according to claim 1, wherein a portion for housing the opening / closing operation unit is formed to have an elliptical cross section, and a non-slip mechanism is provided on a surface thereof.