JPH0780564A - Portable punching tool - Google Patents

Abstract

PURPOSE:To regulate the free rotation by the self-weight of a cylinder in use by providing a positioning mechanism consisting of a ball and a spot facing on the rotational joining surface of an arm member. CONSTITUTION:A punch and a die are mounted on the tip of a shaft 9. A cylinder 2 having a ram where the shaft 9 is mounted in an attachable/detachable manner is rotatably arranged to the tip of a tool body 1 through an arm member 4. A hole of the prescribed shape is made in a plate to be held between the punch and the die by pulling the ram into the cylinder 2 through the hydraulic pressure from a hydraulic pump mounted on the tool body 1. A positioning mechanism 11 consisting of a ball 13 and a spot facing 14 is provided on the rotational joining surface 51 of the arm member 4. This constitution facilitates the smooth rotation and the operation of displacement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching tool used for punching a hole having a predetermined shape in a steel plate such as a switchboard, and in particular, a shaft body having a punch and a die at its tip can be freely attached and detached. A cylinder having an attached ram is arranged at the tip of the tool, and the ram is drawn into the cylinder by the hydraulic pressure from a hydraulic pump provided in the tool body to form a plate member sandwiched between the punch and the die. The present invention relates to a hand-held punch tool for punching a hole in a.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a manual type hydraulic pump 1a is built in, and a drive handle 3a for driving the hydraulic pump 1a is axially mounted on a fixed handle 2a having a grip portion at the base end. A ram 7 operated by pressure oil from a hydraulic pump 1a, to which a shaft body 6a having a punch 4a and a die 5a is detachably attached.
A cylinder 8a having a has a structure in which the tip of the fixed handle 1a is provided, and the shaft 6 attached to the ram 7a.
A hand-held punch tool is known in which a is drawn into a cylinder 8a by a hydraulic pump 1a and a hole having a predetermined shape is made in a plate material 9a sandwiched between a punch 4a and a die 5a.

However, in the conventional hand-held punch tool shown in FIG. 5, the punch 4a and the cylinder 8a for driving the die 5a are fixed.

Therefore, there is no problem in making holes in the plate material 9a before assembling or mounting, but when making holes in the existing parts, it may be difficult to construct the plate material 9a due to the arrangement position and the arrangement angle of the plate material 9a. Occurs.

This is particularly noticeable when there are existing equipment and wiring such as a switchboard.

Therefore, a hand-held punch tool, which is convenient even when a hole is to be formed in an existing place, is, for example, Japanese Utility Model 3-23.
No. 36 publication.

As shown in FIG. 6, this hand-held punching tool attaches a cylinder 8a via an L-shaped arm member 10a and fixes both ends of the L-shaped arm member 10a to a fixed handle 1.
By making the a and the cylinder 8a rotatable, the cylinder 8a can be changed in all directions.

However, in the improved hand-held punch tool shown in FIG. 6, the cylinder 8 having a considerable weight is rotated by its own weight against the intention of the user.

Therefore, there is a problem in that the work is difficult to perform, and the rotation operation is difficult when the connection of the rotating portions is made rigid.

[0010]

The problem to be solved by the present invention is that the conventional improved hand-held punch tool is
It is difficult to operate because the cylinder is displaced by its own weight.

[0011]

SUMMARY OF THE INVENTION According to the present invention, a cylinder having a ram to which a shaft body having a punch and a die at its tip is detachably attached is rotatably attached to the tip of a tool body via an arm member. In a hand-held punch tool, which is arranged and draws a hole of a predetermined shape in a plate material sandwiched between the punch and the die by drawing the ram into the cylinder by a hydraulic pressure from a hydraulic pump provided in the tool body, It has a structure in which the rotating joint surface of the arm member is equipped with a positioning mechanism consisting of a ball and a spot facing, and of course not only the direction of the cylinder can be changed easily, but also the predetermined angle of the cylinder once selected. (EN) It is possible to achieve a purpose of providing a hand-held punch tool which is extremely easy to operate without being displaced in its own position.

[0012]

The positioning mechanism provided at each rotating portion of the tool body, the arm member and the cylinder regulates the free rotation of the cylinder due to its own weight during use.

[0013]

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

1 to 4 show an embodiment of the present invention in which the tool body 1 is provided with an electric hydraulic pump (not shown), which is different from the above-mentioned embodiments. Is well known in the art, and is a cylinder 2 from a hydraulic pump.
The same means as the above-mentioned manual punch tool can be used as the means for circulating and transferring the pressure oil to and the detailed description thereof will be omitted.

In this embodiment, a cylinder 2 having a ram 3 which is operated by pressure oil from a hydraulic pump is attached to the tip of a linear arm member 4 projecting from the tip of the tool body 1.
The crank 5 extending in the direction perpendicular to the axis of the arm member 4
It is attached so as to be rotatable around the axis of the cylinder 5, and the cylinder 2 is attached to the tip portion 51 of the crank 5 by the peripheral side surface 2 thereof.
1, the arm member 4 and the crank 5 are rotatably attached by a rotary shaft 6 extending in a direction perpendicular to the axes.

Further, the cylinder 2 has a ram 10 to which a shaft 9 having a punch 7 and a die 8 is detachably attached at the tip.

A positioning mechanism 11 is provided at the joint between the arm member 4 and the crank 5.

The positioning mechanism 11 has a plurality of holes 4 formed at predetermined intervals on a circumference having a predetermined distance on the rotary joint surface 41 of the arm member 4 about the central axis thereof.
A rotary joint surface 51 between the ball 13 and the ball 13 which is mounted in the spring 2 and is urged toward the crank 5 by the elastic spring 12.
It is composed of a plurality of hemispherical spot facings 14 formed in a circular shape corresponding to the holes 42.

In this embodiment having the above-mentioned structure, as in the case of the conventional example, the shaft body 9 screwed to the ram 3 is drawn into the cylinder 3 by the hydraulic pump built in the tool body 1, and the punch 7 is formed. The plate material 15 sandwiched between the die 8 and the die 8 is provided with a hole having a predetermined shape.

At this time, the cylinder 2 rotates about the mounting shaft to the crank 5 (in the direction of the arrow shown in the drawing), and further,
Since the crank 5 rotates about the axis of the linear arm member 4 projecting at the tip of the tool body 1 (direction of arrow B shown in the drawing), the cylinder 3 is displaced in any direction with respect to the tool body 1. This makes it possible to perform the drilling work very easily even when a hole is formed in an existing location where existing equipment or wiring is provided, such as a switchboard.

In particular, the cylinder 2 always rotates around the linear arm member 4 projecting from the tip of the tool body 1, and the cylinder 2 is always positioned in a stable state so that the balance is not lost and the work is performed. Is easy.

Furthermore, in this embodiment, since the positioning mechanism 11 is provided at the joint between the arm member 4 and the crank 5,
There is no concern that the cylinder 2 will be displaced by its own weight.

Although the present embodiment relates to a hand-held punch tool equipped with an electric hydraulic pump, it can be similarly carried out with a conventional hand-held punch tool equipped with a manual hydraulic pump. Needless to say, the shape of the arm member 4 and the number of rotating portions are not limited, and the cylinder 2 can be carried out on the tool body 1 via the arm member 4 so as to be rotatable. is there.

In this embodiment, the positioning mechanism 11 is provided at the joint between the arm member 4 and the crank 5, but
It goes without saying that a similar positioning mechanism 11 can be provided on the rotary joint surface between the arm member 4 and the cylinder 2.

According to the present invention, since each rotary joint surface of the arm member for mounting the cylinder on the tool body is provided with the positioning mechanism composed of the ball and the spot facing, there is no fear that the cylinder is displaced by its own weight. Further, the rotation is smooth and the displacement operation is easy.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX in the embodiment shown in FIG.

FIG. 3 is an enlarged sectional view showing a main part of the embodiment shown in FIG.

FIG. 4 is an enlarged cross-sectional view taken along line YY of FIG.

FIG. 5 is a perspective view showing a conventional example.

FIG. 6 is a perspective view showing another conventional example.

[Explanation of symbols]

 1 Tool Main Body 2 Cylinder 3 Ram 4 Arm Member 11 Positioning Mechanism 13 Ball 15 Plate Material 14 Counterbore 41 Rotating Joint Surface 51 Rotating Joint Surface

Claims (1)

[Claims] 1. A cylinder having a ram to which a shaft body having a punch and a die at its tip is detachably attached is rotatably arranged at an end of a tool body via an arm member, and the ram is provided to the tool. In a hand-held punching tool that punches a hole of a predetermined shape in the plate material sandwiched between the punch and the die by drawing it into the cylinder by the hydraulic pressure from a hydraulic pump provided in the main body, a ball is attached to the rotary joint surface of the arm member. A hand-held punch tool, which is equipped with a positioning mechanism consisting of