JPH04283079A - Driving tool - Google Patents

Abstract

PURPOSE:To reliably prevent a sudden, spontaneous discharge of a stud by disposing a safety valve to bring a compressed air feed line into a closed state during the use of a hook. CONSTITUTION:A feed line for compressed air, by means of which a given stud is caused to perform embossing operation, is disposed to a tool body 1 and a trigger 7 to perform operation to open and close the feed line and operate a tool is operably located. A safety valve 14 to bring the compressed air feed line into a closed state during the use of a hook 23 is provided. When a driving tool is not used, the hook 23 is rotated in a 180 deg. arc to the handle 2 side to close the air continuity hole of a valve and stop the feed of air from an air plug 5. When, with this state, the hook 23 of the driving tool is hooked to the west belt of an operator, a heavy head part 1a is brought into a down state and hung down in a stable state from the waist belt and other work can be safely executed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving tool, and is particularly applicable to a driving tool for fasteners such as nails, and relates to a driving tool equipped with a safety device to prevent the fastener from exploding when the tool is not in use.

0002

[Prior Art] Generally, a piston driven by a drive source such as compressed air is disposed inside a tool body, and
A driving tool is often used in which a trigger lever for operating the piston is provided on the tool body, and by operating the trigger lever, the piston is suddenly operated to drive a predetermined fastener such as a nail. There is.

Conventionally, in such a driving tool, as disclosed in, for example, Japanese Utility Model Application Publication No. 63-41485, a plurality of hooks are attached to the tool body at different attachment positions, and the hooks are attached to the tool body by an operator. There is a driving tool that can be hooked onto a person's waist belt, etc., thereby freeing the operator's hands to improve work efficiency for other tasks.

0004

[Problem to be Solved by the Invention] However, in the conventional driving tool, when the driving tool is not in use, the hook is hung on the operator's waist belt to suspend the driving tool while performing other work. However, if the trigger lever of the driving tool is accidentally touched, the stopper will suddenly come out of the driving tool, which is extremely dangerous and may cause injury.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a driving tool that can reliably prevent the sudden explosion of the stopper when using the hook, thereby significantly increasing safety. It is.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the driving tool according to the present invention is provided with a compressed air supply conduit for driving a predetermined stopper in the tool body, and a A driving tool is provided with a movable trigger lever that opens and closes a supply conduit to operate the tool, and the trigger lever is formed integrally with a hook on the tool body and closes the compressed air supply conduit when the hook is in use. It is equipped with a safety valve.

[0007]

[Operation] According to the present invention, the tool body is provided with a safety valve that closes the compressed air supply line when using the hook, and when the hook is hooked on the waist belt, the safety valve is always closed. Since it is designed to be closed, even if the trigger lever is accidentally activated when the tool is not in use, compressed air will not be supplied, which will reliably prevent the stopper from exploding, significantly increasing safety. It is something that can be done.

[0008]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4. 1 to 4 show an embodiment of a driving tool according to the present invention, in which a tool body 1 has a gripping handle 2 on one side thereof, and inside the tool body 1 there is a handle 2 for gripping. For example, a striking piston 3 for driving fasteners such as nails is built in. An air passage 2a is formed in the handle 2 of this tool body 1, and a drive for operating the striking piston 3 via an end housing 4 is provided at the tip of the handle 2 (on the right side in FIG. 1). An air plug 5 is attached to supply compressed air as a source, and a nose 6 for driving out the stopper by the action of the striking piston 3 is attached to the tip of the tool body 1 (lower part in FIG. 1). It is installed protrudingly.

Further, a trigger lever 7 having a U-shaped cross section for operating the striking piston 3 is attached to the base of the handle 2 of the tool body 1 so as to be swingable about a support shaft 8. In the vicinity of the trigger lever 7 of the handle 2, there is a drive valve 9 that communicates with the air passage 2a to supply and stop the compressed air etc. to the striking piston 3. It is mounted and exposed to the outside. An opening/closing drive pin 10 is fitted into the drive valve 9 and is slidable along the inside of the drive valve 9 and whose tip abuts against the back surface of the trigger lever 7. A return spring 1 is provided between the exposed surface of the trigger lever 7 and the back surface of the trigger lever 7 for biasing the trigger lever 7 toward the initial position (downward position in FIG. 1).
1 is interposed. Then, the trigger lever 7 is swung against the biasing force of the return spring 11, and the drive pin 10 is pushed in by the trigger lever 7, thereby opening the drive valve 9, and the striking piston 3
By rapidly operating the striking piston 3 with this compressed air, the stopper preloaded in the tool body 1 is struck and a high-speed blow is caused from the nose 6. It is designed to be launched with.

Furthermore, in this embodiment, air passage holes 13a and 13b are formed inside the end housing 4 to communicate the air supply hole 12 of the air plug 5 with the air passage 2a in the handle 2. A safety valve 14 is provided in the air passage holes 13a, 13b of the end housing 4. This safety valve 14 has a cylindrical valve body 15 that passes through the end housing 4 through the air passage holes 13a and 13b, and the valve body 15 is rotatable about its central axis. It is said that Further, a through hole 16 is formed in the valve body 15 at a position corresponding to the air conduction holes 13a, 13b, and the through hole 16 penetrates through the valve body 15 in its diameter direction. An on-off valve 17 is housed therein. An end cap 19 having a hole 18 formed in the center is fixed to one end of the through hole 16, and the end cap 19 and the on-off valve 17 are connected to each other.
A spring 20 is disposed between the opening and closing valve 17 to urge the on-off valve 17 toward the other end of the through hole 16.

Further, in this embodiment, the air passage hole 13a on the side of the air plug 5 has an inner diameter larger than the diameter of the on-off valve 17 at a portion that communicates with the end of the through hole 16 of the valve body 15. Tapered expanded portion 21
The air passage hole 13b on the handle 2 side is formed to have an inner diameter smaller than the diameter of the on-off valve 17. Furthermore, the opening/closing valve 17 is located in the center of the expanded portion 21 of the air passage hole 13a.
A stopper 22 is formed so as to come into contact with the on-off valve 17 in a side position.

[0012] Also, at one end of the valve body 15,
A hook 23 having a substantially L-shape is fixed to the tool, and the hook 23 is adapted to be hung on, for example, the operator's waist belt when the tool is not in use. Further, between the valve body 15 and the end housing 4,
A plurality of sealing members 24 such as rings are interposed so that when the hook 23 is rotated to rotate the valve body 15, the through hole 16 and the air passage hole 13 are sealed from the outside. It has become.

Next, the operation of this embodiment will be explained. When using the driving tool, first, as shown in FIG. 4, rotate the hook 23 toward the air plug 5 side to move the on-off valve 17 in the through hole 16 of the valve body 15 to the stopper of the air passage hole 13a on the air plug 5 side. 22. As a result, the compressed air supplied through the air supply hole 12 of the air plug 5 is sent to the inside of the through hole 16 through the surroundings of the on-off valve 17 by the widened part 21 of the air passage hole 13a, and further The air is sent to the air passage hole 13b through the hole 18 of the cap 19 and supplied to the drive valve 9 through the air passage 2a. At this time, hook 2
3 is not located on the handle 2 side but on the air plug 5 side, so the hook 23 does not get in the way of the operator grasping the handle 2.

In this state, the operator grasps the handle 2 portion of the tool body 1 and puts his or her finger on the trigger lever 7, and by pulling the trigger lever 7, the driving pin 10 is moved to the driving valve 9. It is pushed into the interior, and the driving valve 9 is opened. By opening the driving valve 9, the striking piston 3 is suddenly operated by the compressed air supplied through the air plug 5, and a predetermined fastener, such as a nail, is struck and the nose 6 is opened.
It is designed to be launched from

On the other hand, when the driving tool is not used, the hook 23 is attached to the handle 2 as shown in FIG.
Rotate 180° to the side to open the through hole 16 of the valve body 15.
By locating the on-off valve 17 in the air inlet 13b on the handle 2 side, the on-off valve 17 opens the air inlet 1.
3b is closed, and as a result, the compressed air supplied through the air supply hole 12 of the air plug 5 is no longer supplied to the air passage 2a and the drive valve 9. In this state, when the hook 23 of the driving tool is hooked onto the waist belt of the operator, the heavy head 1a is turned down and suspended from the waist belt in a stable state, freeing the operator's hands and allowing him to use other tools. able to perform work. That is, when the hook 23 is hooked onto the waist belt, the safety valve 14 is always closed, and even if the drive valve 9 is opened by accidentally operating the trigger lever 7, the compressed air will not be released. is not supplied, and it is possible to prevent the stopper from suddenly firing due to the operation of the striking piston 3.

Therefore, in this embodiment, the safety valve 14 is opened and closed by rotating the hook 23, and the safety valve 14 is always closed when the hook 23 is hooked on the waist belt. Even if the trigger lever 7 is operated by mistake and the drive valve 9 is opened, compressed air is not supplied and the striking piston 3
It is possible to reliably prevent the sudden explosion of the stopper due to the movement of the stopper, thereby preventing the occurrence of injuries and the like, thereby significantly increasing work safety.

Further, the spherical on-off valve 17 is connected to the air passage hole 1.
3a or the air conduction hole 13b side, it also has the function of a click mechanism in order to ensure that it stands still. Furthermore, the on-off valve 17 also functions as a check valve to prevent backflow of compressed air. That is, as shown in FIG. 3, if the air hose is attached to or removed from the air plug 5 while the compressed air does not flow to the air passage 2a side of the handle 2, the compressed air remaining inside the tool body 1 will flow to the air plug 5 side. The air hose does not flow, the influence of residual air pressure is reduced, and air hoses can be attached and detached with minimal force.

[0018]

[Effects of the Invention] As described above, in the driving tool according to the present invention, the opening and closing operations of the safety valve are linked to the hook, so that the safety valve is always closed when the hook is hooked on the waist belt. Therefore, even if the trigger lever is operated by mistake, compressed air will not be supplied, and the sudden explosion of the stopper can be reliably prevented, preventing injuries and greatly increasing work safety. It has the following effects:

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of a tool to which a driving tool according to the present invention is applied.

FIG. 2 is an enlarged front view including the end housing portion of FIG. 1;

FIG. 3 is a longitudinal sectional view showing the safety valve of FIG. 1 in a closed state.

FIG. 4 is a longitudinal cross-sectional view showing the safety valve of FIG. 1 in an open state.

[Explanation of symbols]

1 Tool body 2 Handle 3. Impact piston 4 End housing 5 Air plug 7 Trigger lever 9 Drive valve 10 Drive pin 12 Air supply hole 13a, 13b Air conduction hole 14 Safety valve 15 Valve body 16 Through hole 17 On-off valve 21 Expanded section 23 Hook

Claims (1)

[Claims] Claim 1: A compressed air supply conduit is provided in the tool body to drive a predetermined stopper, and a trigger lever that operates the tool by opening and closing the supply conduit is freely movable. 1. A driving tool, characterized in that the tool body is provided with a safety valve that is formed integrally with the hook and closes the compressed air supply line when the hook is in use.