JPH0513508Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a fastener driving tool for driving a nail-shaped fastener into concrete or the like using explosive gas pressure from gunpowder.

Prior art and its problems A fastener driving method in which a cartridge is provided at the tail end of the gun barrel that guides the fastener, and by operating a firing mechanism behind the chamber, an empty cartridge in the chamber is fired to drive the fastener. Tools of the type in which a piston is disposed between the chamber and the fixing device to drive the fixing device at low speed are disclosed in, for example, Japanese Patent Publications No. 42-14440, No. 42-20679, and No. 43.
-2194, 43-7506, 48-30951, Jikko 43-
23831, 43-29024, 46-18944, 47-9704
It has been known for a long time as seen in the publication.

The piston is driven forward by the pressure of the explosive gas generated behind it, and when the fixing tool has been driven in, it is repeatedly moved back to a position where it almost touches the chamber. As a means for retracting the piston, there is a method in which a slot extending in the longitudinal direction is provided in the gun barrel, and a return piece attached to a housing surrounding the barrel protrudes from the slot into the gun cavity (for example, Japanese Patent Publication No. 58
(Refer to Japanese Patent No. 7432), when driving is completed, the barrel is pulled out to the front of the housing, and the return piece hits the piston, causing the piston to move relatively backward.

With this configuration, when the tip of the gun barrel is grasped and pulled out, the piston can be moved back until it hits the rear end in the barrel, so the piston can be fired and driven with the piston always in a fixed position. Therefore, a certain amount of driving energy can be applied to the driving pin, but if the driving pin is driven repeatedly, the heat generated by the explosion of gunpowder will heat up the gun barrel, making it difficult to grip. Ta.

Purpose of the Invention The purpose of the present invention is to solve these problems and provide a fastener driving tool that can reliably and easily grasp and pull out the tip of the gun barrel.

Structure of the Device In order to achieve the above-mentioned object, the present invention includes a gun barrel in which a chamber is provided at the tail end and a slot extending in the longitudinal direction, and a piston for driving the fixing device is fitted into the bore of the gun barrel. In the fastener driving tool, the gun barrel is longitudinally movably enclosed in a housing, and a return piece attached to the housing projects from the slot into the gun cavity. It is characterized by a structure in which a cylindrical grip member whose distal end protrudes to the front of the housing and is made of heat-resistant synthetic rubber and has flanges at both ends is removably attached to the distal end of the gun barrel.

Embodiment An embodiment of the present invention will be described with reference to the drawings. A firing mechanism 2 is disposed at the rear of a gun barrel 1, and these are respectively enclosed by a housing 3 and a handle frame 4. The barrel 1 has a chamber 5 at the tail end into which an empty cartridge is loaded, and a slot 6 extending in the longitudinal direction from a little forward of the chamber to the tip edge, and the barrel 7 has a fastener drive. A piston 8 for use is fitted. The piston 8 consists of a large-diameter base end 8a that is tightly fitted into the gun cavity 7 and a small-diameter tip 8b that extends forward. It can be moved back to the position where it hits the rearmost position.

The housing 3 consists of an inner housing 9 that encloses the gun barrel 1 concentrically and an outer housing 10 that encloses the outside of the inner housing 9 eccentrically. It is movable to.

A sub-barrel 11 is disposed in front of the gun barrel 1, through which the tip 8b of the piston 8 passes. is pressed against the tip surface of the The sub-barrel 11 and the cylinder body 12 constitute a part of the gun barrel 1, and the sub-barrel 11 protrudes forward of the housing 3, and the cylinder body 12 of this protruding part is made of heat-resistant synthetic rubber and has flanges 14a at both ends. , 14b is attached, and can be removed by pulling it out forward. Furthermore, a return piece 15 is attached to the tip of the housing 3,
It projects into the gun cavity 7 through the slot 6 .

In this embodiment having such a configuration, when the empty cartridge in the chamber 5 is fired by the firing mechanism 2 to drive the piston 8 and the fixing device equipped on the sub-barrel 11 is driven into concrete or the like, the grip member 14 Hold the gun barrel 1 in your hand,
The sub-barrel 11 and the cylinder body 12 are pulled out from the housing 3 as a unit, and the piston 8 moving forward together in the gun cavity 7 is moved by the return member 15 hitting the shoulder 8c on the front surface of the base end 8a. The barrel 1 is then pulled out and relatively retracted until it hits the rearmost end of the barrel 7, and then the housing 3
By pushing it in, it returns to the initial position.
The grip member 14 has flanges 14a and 14b at both ends, so by gripping between them, your hand will not slip out when you pull it in the drawer direction, and when you return the gun barrel 1, your skin and gloves will be removed. The grip member 14 is not pinched between the flange-like stopper 12b provided on the cylindrical body 12 of the housing 3 and the grip member 14.

The cylindrical body 12 has a parallel surface 12a on the outer peripheral surface of the distal end thereof, and the grip member 14 is attached without idle rotation by mutually contacting the parallel portion 14c on the inner peripheral surface of the grip member 14.

Effects of the invention As described above, according to the invention, a piston for driving the fastener is fitted into the cavity of the gun barrel, which has a chamber and a slot extending in the longitudinal direction at the tail end, and this barrel is connected to the housing. A fastener driving tool is a fastener driving tool in which the housing is movable in the longitudinal direction, and a return piece attached to the housing is made to protrude from the slot into the gun cavity. Since the grip member is attached to the tip of the gun barrel, it is easier to grip than when gripping the gun barrel directly, and even if the gun barrel heats up due to repeated firing, it can be easily gripped and operated without pain. Even when the piston is hot, it is possible to return the piston to a predetermined position and apply constant driving energy to the driving pin. By providing flanges at both ends of the grip member, the grip member can be gripped and operated reliably and safely without slipping out or pinching the skin or gloves between the grip member and the housing. Further, since the grip member is removable, it is convenient to insert the gun barrel into a narrow place and drive the gun.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is a partial cross-sectional view, FIG. 3 is a longitudinal sectional view of the grip member, and FIG. 4 is an end view of the grip member. 1... Barrel, 3... Housing, 5... Chamber,
6... Slot hole, 7... Gun cavity, 8... Piston, 14
... Grip member, 15 ... Return piece.

Claims (1)

[Scope of utility model registration request] A piston for driving an anchor is fitted into the bore of a gun barrel which is provided with a chamber at the tail end and a slot extending in the longitudinal direction, and the barrel is enclosed in a housing so as to be movable in the longitudinal direction. Along with being there,
In this fixing device driving tool, in which a return piece attached to the housing is made to protrude from the slot into the gun cavity, the tip of the gun barrel protrudes forward of the housing, and is made of heat-resistant synthetic rubber. A fastener driving tool characterized in that a cylindrical grip member having flanges at both ends is removably attached to the tip of the gun barrel.