JP2549617Y2 - Safety devices for compressed air powered nailers - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a compressed air powered nailer provided at an end of a grip to which an air hose extending from a compressed air source is connected.

[0002]

2. Description of the Related Art During a nailing operation using a compressed air powered nailing machine (hereinafter referred to as a nailing machine),
In order to temporarily suspend the original nailing operation and perform another operation, there is a nailing machine in which a worker hooks the nailing machine on a waist belt and forms a hook for freeing both hands (for example,
See JP-A-63-41485).

[0003] The nailing machine usually does not start unless the contact member and the trigger lever, which are arranged so as to protrude further from the distal end surface of the nose, are simultaneously operated, but the operator pulls the nailing machine on the waist belt. When hanging or removing from the waist belt, when the operator's finger pulls the trigger lever and the contact member contacts a part of the worker's body or an object around the body, the nailing machine is activated May be done. This activation is very dangerous. In order to eliminate this danger, a safety device is arranged at the grip end of the nailing machine to cut off the communication between the compressed air supply source and the compressed air storage chamber in the nailing machine by axial movement of the spool valve body with respect to the belt hook. A nailing machine is known (see Japanese Utility Model Laid-Open No. 2-7981). This safety device is reliable in that it is automatically activated by the weight of the nailer. However, in this safety device, since the compressed air flow necessary for the operation of the nailing machine must be ensured during normal use of the nailing machine, the built-in safety valve becomes too large, and furthermore, the amount of movement of the spool valve element is increased. Also became too large.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a safety device for a nailing machine which is highly reliable and smaller than a spool valve type.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a safety valve provided at the end of a grip having a compressed air storage chamber therein in a nailing machine. A safety valve having a rotary valve body that opens and closes with an external compressed air supply source; and a safety valve fixed to the rotary valve body, protruding in a direction parallel to the nose with respect to the grip, and constantly biased by a spring in this direction. Having a hook, and hooking the hook on something other than the nailer, the nailer rotates by its own weight, and the safety valve closes the compressed air storage chamber to the compressed air supply source and communicates with the atmosphere. It is characterized by the following.

[0006]

[Operation and effect of the invention] When an operator hooks a nailing machine on something other than the nailing machine (for example, a waist belt of the worker), the nailing machine is rotated by a moment due to its own weight. As a result, the rotary valve body automatically shuts off the compressed air storage chamber from the compressed air supply source and opens it to the atmosphere.
A highly reliable safety device that is smaller than the conventional slide type can be obtained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The nailing machine 1 equipped with the safety device of the present invention has a piston-cylinder mechanism 2 built in its front part, and a rod-shaped driver (not shown) is reciprocated by the piston-cylinder mechanism 2. The driver operates the piston and the piston by operating the nailing operator through the trigger lever 3.
Reciprocate in the nose 4 attached to the lower end of the cylinder,
The nail at the leading position of the connecting nail previously fed into the nose 4 is driven into the nail driving material. The nailing machine 1 has a safety device 6 at a rear end 5a of a grip 5 extending rearward from the piston / cylinder mechanism 2. In the grip 5, a compressed air storage chamber 5b is formed.

As shown in FIGS. 1 and 2, the main part of the safety device 6 includes a pivot 7 on a rear end 5 a of the grip 5.
, A hook 9 fixed to the rotary valve 8, and a rear end 5 a of the grip 5.
And a valve seat 10 in sliding contact with the rotary valve body 8. The rotary valve element 8 and the hook 9 are shown in FIGS.
Rotate 1/4 clockwise.

A first air passage 11 and a second air passage 12 are formed in the rotary valve body 8. The first air passage 11 is formed on a side surface of the rotary valve body 8. An air plug 13 that constantly communicates with the first air passage 11 is screwed to the rear end 5 a of the grip 5. Air plug 13
Is connected to an air hose (not shown) extending from a source of compressed air. The second air passage 12 is formed on a side surface of the rotary valve body 8 on a side opposite to the first air passage 11 with respect to a center of a circle of the rotary valve body 8. One end 12a of the second air passage 12
Extends to a portion close to one end 11a of the first air passage 11. The second air passage 12 is provided at the rear end 5 a of the grip 5.
The air is always communicated with the atmosphere through an air passage 16 formed at the lower end portion of the air conditioner.

[0010] As shown in FIG.
The free end 9a is biased by a spring (not shown) together with the rotary valve body 8 so as to face downward when the operator is holding the nailing machine. When the worker hooks the hook 9 on the waist belt from above, the nailer is rotated downward by the moment generated by its own weight, and the hook 9 is also rotated to a position extending in parallel with the grip 5. As a result, the connection between the first air passage 11 and the compressed air storage chamber 5b in the grip 5 is cut off, and the hook 9 is automatically latched by the latch mechanism (not shown) at the position shown in FIG. Is done. The valve seat 10 has a communication hole 14 formed therein.

When the worker hooks the hook 9 on the waist belt from above while holding the nail driver horizontally, the nail driver pivots downward against the spring force by the moment generated by its own weight. I do. Therefore, first, the first air passage 11 is cut off from the communication hole 14 of the valve seat 10, and
The air passage 12 is connected to the communication hole 14. As a result, the residual compressed air in the compressed air storage chamber 5b is removed from the second air passage 12
And discharged to the atmosphere through the air passage 16. As a result, the first air passage 11 is separated from the valve seat 10 and the nailing machine is driven by residual compressed air in the compressed air storage chamber 5b which may be generated before the second air passage 12 is engaged with the valve seat 10. Minimize the risk of explosion. When the operator pulls out the hook 9 from the waist belt to release the latch of the hook 9 in order to use the nailing machine again, the rotary valve 8 is moved by the spring force as shown in FIG.
Return to the position shown in. Thereby, the air hose communicates with the compressed air storage chamber 5b.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a compressed air powered nailer equipped with the safety device of the present invention.

FIG. 2 is a sectional view of the safety device of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressed air powered nail driver 4 Nose 5 Grip 6 Safety device 8 Rotary valve body 9 Hook

Claims (1)

(57) [Scope of request for utility model registration] 1. A compressed air-powered nailing machine, comprising a safety valve provided at an end of a grip having a compressed air storage chamber therein, wherein the compressed air storage chamber has an atmosphere and compressed air outside the nailing machine. A safety valve having a rotary valve body that opens and closes with the supply source; and a hook fixed to the rotary valve body and protruding in a direction parallel to the nose with respect to the grip and constantly biased by a spring in the direction. Then, by hooking the hook on something other than the nailing machine, the nailing machine rotates by its own weight, and the safety valve closes the compressed air storage chamber to the compressed air supply source and communicates with the atmosphere. Compressed air powered nailer safety device.