JP3873695B2 - Nailer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a nailing machine for driving nails. Electricity, gas, compressed air, and the like can be considered as the power source of the nailing machine of the present invention. Hereinafter, a pneumatic nailing machine using compressed air as a power source will be described.
[0002]
[Prior art]
A conventional nailing machine will be described with reference to FIGS.
[0003]
As is well known, a nailing machine using compressed air as a power source incorporates a drive unit for reciprocating a piston and has an output unit 6 having a handle 8 that is held by the operator's hand. It has a nose portion 7 that sequentially fires, and performs a driving operation by receiving supply of compressed air through a normal hose. When performing the driving operation, the push lever 1 overcomes the downward pressing force of the coil spring 2 by pressing the lower end of the push lever 1 against a material to be driven such as wood, and this pushes up a trigger arm (not shown). in an impact manner lowers the piston and switch's section 9 actuated by pulling the trigger 11 driving the nail. Alternatively, the trigger 11 can be driven in the same manner by pulling the trigger 11 first and pressing the tip of the push lever 1 against the workpiece.
[0004]
[Problems to be solved by the invention]
As shown in FIG. 6, the lower end and the upper end of the coil spring 2 are held by a push lever 1 and a nose part 7, respectively, and the compression operation is repeated as the push lever 1 moves up and down. 7, the push lever 1 is tilted and raised from the normal vertical direction (FIG. 7). As a result, the coil spring 2 is not compressed vertically, and the coil spring 2 is deformed by repeating this. (Fig. 8). In addition, when the push lever 1 is repeatedly tilted up and down, a part of the push lever 1 is extremely worn.
[0005]
An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, to enable the push lever to move up and down in the correct vertical direction, and to prevent deformation and sag of the coil spring or wear of the push lever. That is.
[0006]
[Means for Solving the Problems]
The above object is achieved by making the coil spring 2 trapezoidal in which the diameter at the upper end is smaller than the diameter at the lower end and attaching a trapezoidal shaft located inside the coil spring to the push lever.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the nailing machine of the present invention will be described below with reference to FIGS. As shown in FIGS. 1 and 4, the nail driver includes an output portion 6 having a compressed air accumulating chamber and a piston 15 for driving the nail and having a handle 8 held by a worker, and below the output portion 6. It has a nose portion 7 having an injection port 16 through which the nail 13 is sequentially driven, a magazine 12 for storing the nail 13, and the like. The handle 8, the switch's section 9, the trigger arm 10 and trigger 11 to operate the switch's unit 9, the lower end is vertically movably held in the nozzle 16 tip, upper end of the trigger arm 10 The push lever 1 extends to the vicinity of the trigger 11 so as to be raised. The push lever 1 is provided with a coil spring 2 for pressing the push lever 1 downwards in the middle portion, the coil spring 2 has a diameter of the upper end is formed smaller than the diameter trapezoidal lower end, the nose section 7 It is provided between the recessed portion 4 provided and the flat portion 5 provided in the push lever 1 . A trapezoidal shaft portion 3 located inside the coil spring 2 is attached to the upper surface of the flat portion 5.
[0008]
When the nail 13 is driven, the trigger 11 is lifted in advance, and the nail 13 is driven out by pushing the tip of the push lever 1 against the workpiece 14 and pushing up the push lever 1. Alternatively, if the tip of the push lever 1 is pressed and the push lever 1 is pushed up and then the trigger 11 is pulled up, the nail 13 is similarly driven out.
[0009]
When the nail 13 is driven, the push lever 1 overcomes the pressing force of the coil spring 2 and rises. When the push lever 1 is the coil spring 2 reaches the top dead center is maximum compression, projecting upper end of the shaft portion 3 is in the recess 4 of the nose portion 7 (Fig. 3), the coil spring 2 the shaft 3 as a guide Since it is compressed, the coil spring 2 is not inclined and compressed. Accordingly, the coil spring 2 can repeat normal expansion (FIG. 2) and contraction (FIG. 3) operations. As a result, the push lever 1 as a whole can be moved up and down in the normal vertical direction, so that partial wear due to the tilt can be prevented.
[0010]
【The invention's effect】
As described above, according to the present invention, the coil spring that presses the push lever downward is trapezoidal and the coil spring moves up and down by guiding the trapezoidal shaft provided inside the coil spring. Therefore, the coil spring is not easily deformed even when used for a long period of time, and it is possible to prevent a part of the push lever from being worn. As a result, a long-life nailing machine can be provided.
[Brief description of the drawings]
FIG. 1 is a partially sectional front view showing an embodiment of a nailing machine of the present invention.
2 is a side view of FIG. 1 viewed from the direction A. FIG.
3 is a side view showing a state where the push lever is moved to the top dead center in FIG. 2;
FIG. 4 is a perspective view showing a working state of the nailing machine of the present invention.
FIG. 5 is a front view showing an example of a conventional nailing machine. FIG. 6 is a side view of FIG.
7 is a side view showing a state in which the push lever is located at the top dead center in FIG. 6. FIG. 8 is a schematic diagram showing a normal product (left) and a modified product (right) of the coil spring.
[Explanation of symbols]
1 push lever, 2 is a coil spring, 3 a shaft portion, the recess 4, 5 is a plan section, 6 output unit, 7 is a nose portion, 8 handle, 9 switch's unit, 10 Torigamu, 11 is a trigger, 13 is a nail, 15 is a piston, and 16 is an injection port.

Claims (1)

A body having a built-in piston driving a nail, provided in the main body downward, and a nose portion having an injection port which nail is struck, and a handle extending laterally from the body, the switch's unit on the handle, a trigger for operating the switch's part, the lower end is vertically movably retained in the injection port tip, nail driver having a push lever extending upper end to a trigger vicinity, and a coil spring for pressing the push lever downward Because
The coil spring has a side trapezoidal shape, that is, a conical shape, whose outer diameter at the upper end is smaller than the outer diameter at the lower end. Is attached to the flat part of the push lever, is located inside the coil spring, and the push lever rises the height of the side trapezoidal shaft that guides the coil spring attached to the flat part of the push lever. The length of the coil spring is substantially the same as when the coil spring is compressed, and the upper end of the shaft portion protrudes into the recess when the push lever is raised and the coil spring is compressed. Machine.

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