JP2000263151A - Punching tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute accurate punching by enabling the accurate positioning of the attitude of a tool even when a place to be punched is a plane part and preventing the change in the attitude of the tool at the time of striking. SOLUTION: The body part of a punching rod 3 is freely slidably penetrated through the outer cylinder 2 which becomes a grasping part, a head part 7 for striking is attached to the root part of the punching rod 3 and, by energizing the punching rod 3 with an energizing member 10, the cutting edge at the tip is projected to the outside of the outer cylinder 2. A positioning pin 12 whose tip is tapered which is energized with the energizing member 13 is incorporated into a hole 11 formed in the middle of the cutting edge 5 and the tip is projected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching tool for making holes in, for example, a flat plate material.

[0002]

2. Description of the Related Art Conventionally, as a tool for forming a through hole in a work, for example, a tool disclosed in Japanese Patent Application Laid-Open No. H10-156798 has been known. This tool 51 is shown in FIG.
As shown in FIG. 7, a cutting blade 54k is formed at the tip of a punching core member 54 attached to the gripping portion main body 52 via a set bolt 53, and a tubular guide member 55 is provided around the tip side. Member 55 and gripper body 5
2 and a spring member 56 is interposed.

When drilling with such a tool 51, for example, the gripper body 52 is gripped with one hand, and the lower end of the cylindrical guide member 55 is positioned by abutting against the drilled portion of the work. With one hand, the top of the gripper body 52 is hit with a hammer or the like to make a hole.

[0004]

However, in the above-mentioned tool, the gripper body 52 is hit with a hammer or the like while the gripper body 52 is being gripped.
There was a problem that a hole was punched obliquely and the position of the hole was shifted. In addition, when the drilled portion of the workpiece is a concave portion, positioning is relatively easy, but when punching a flat portion, it is difficult to position the workpiece at an accurate position, and accurate drilling is performed. It was difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and enables a tool to be positioned at an accurate position even when a drilled portion is a flat portion, and prevents a change in the attitude of the tool at the time of impact. The purpose is to make accurate drilling.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a punching rod having a cutting edge formed at the distal end and a head portion at the base end side, and a body portion of the punching rod slidably. An outer cylinder that is inserted and used as a gripping part at the time of punching is provided, and the punching rod is urged to the distal end side by an urging member so that at least a part of the distal end is projected outside from the outer cylinder.

As described above, the outer cylinder is provided around the body of the punching rod, and the outer cylinder is gripped as a grip portion, and a hammer at the time of punching is applied to the head on the base end side of the punching rod. By doing so, it is possible to hold the posture of the tool accurately,
There is no problem such as displacement.

Further, if a part of the tip of the punching rod is projected outside the outer cylinder by the biasing member, the cutting blade can be set at an accurate position when the tool is first positioned at the drilling position.

According to a second aspect of the present invention, the tip of a resiliently supported positioning pin is projected from the center of the tip cutting blade of the punching rod, and the positioning pin is inserted into a hole formed in the center of the punching rod. Made it possible.

As described above, the tip of the positioning pin is projected from the center of the cutting blade, and a mark or the like is formed at the center of a hole made of a material, for example. Can be drilled in position.

[0011]

Embodiments of the present invention will be described with reference to the accompanying drawings. Here, FIG. 1 is a longitudinal sectional view of the punching tool according to the present invention, FIG. 2 is a bottom view of the punching tool, FIG. 3 is an external view for explaining a state at the time of drilling, and FIG.

The punching tool 1 according to the present invention is a hand tool which basically grips the tool with one hand and punches a hole by hitting the head of the gripped tool with a hammer or the like.
As shown in the figure, the outer cylinder 2 is provided with a punching rod 3 slidably inserted through the inside of the outer cylinder 2, and a spherical concave portion 4 is formed on a distal end surface of the punching rod 3, The periphery is a cutting blade 5.

The base end of the punching rod 3 has a small-diameter portion via a step d. The small-diameter portion slidably penetrates a central opening of the lid member 6 described below and is exposed to the outside. A head 7 having a large diameter and used at the time of hitting with a hammer or the like is screwed to the rod end.

The lid member 6 has a female screw portion 9 which can be screwed into a male screw portion 8 formed on the outer peripheral surface on the base end side of the outer cylinder 2. 3 is provided with an opening through which the small diameter portion of the punching rod 3 can be inserted, and a biasing member 10 is interposed between the small diameter portion of the punching rod 3 and the step portion d. It is screwed to the outer cylinder 2.

Then, by the urging force of the urging member 10,
At least a part of the tip of the punching rod 3 projects outside the outer cylinder 2.

A hole 11 is provided at the center of the spherical concave portion 4 at the tip of the punching rod 3, and a positioning pin 12 having a tapered tip is slidably provided in the hole 11. An urging member 13 is provided between the base end surface of the positioning pin 12 and the bottom surface of the hole 11 to urge the positioning pin 12. It protrudes. Also, this positioning pin 1
2 has an engagement surface 12a having a predetermined length along the axial direction.
The tip surface of the engaging bolt 14 is in contact with the engaging surface 12a.

That is, a screw hole 15 is formed on the side surface of the distal end portion of the punching rod 3 in a radial direction toward the hole 11. An engaging bolt 14 is screwed into the screw hole 15 to form The positioning pin 12 is in contact with an engaging surface 12a, and the positioning pin 12 is slidable by a stroke amount corresponding to the axial length of the engraved engaging surface 12a.

A notch 16 having a predetermined length in the axial direction is provided at a position corresponding to the head of the engaging bolt 14 on the side surface of the distal end portion of the outer cylinder 2. On the other hand, when the punching rod 3 slides, the movement of the engagement bolt 14 is guided.

The operation of the punching tool 1 as described above will be described. First, as shown in FIG. 3, a recess e serving as a mark is formed in the center of a drilled portion of the workpiece W with a punch or the like (not shown).

Then, the operator operates the outer cylinder 2 of the punching tool 1.
Is gripped with one hand and positioned so that the tip of the positioning pin 12 is aligned with the recess e. Then, the tool 1 is pushed down by hand, and as shown in FIGS. The front end surface is brought into contact with the workpiece W.

At this time, the punching rod 3 is
Of the outer cylinder 2 against the urging force of the urging member 13, and the positioning pin 12 slides into the hole 11 against the urging force of the urging member 13.
Sliding inside. Further, the tip end surface of the outer cylinder 2 is
, The punching tool 1 is held in a vertical posture with respect to the processing surface of the workpiece W.

Next, the operator hits the head 7 on the base end side of the punching rod 3 with a hammer or the like. Then, the cutting blade 5 of the punching rod 3 penetrates the workpiece W, and as shown in FIG. 4C, a hole is made in the workpiece W.
Since the outer cylinder 2 has nothing to do with hitting, there is no problem that the outer cylinder 2 is inclined or the position of the hole is shifted, and it is possible to drill a hole at an accurate position and in an accurate shape. Moreover, the position of the hole can be made more accurate by the initial positioning using the positioning pin 12 and the recess e.

Incidentally, if the workpiece W is made of a material such as iron that can be magnetized, a magnet may be provided at the tip of the outer cylinder 2. In this case, when the tool 1 is pushed down to bring the tip of the outer cylinder 2 into contact with the workpiece W, the tip face of the outer cylinder 2 magnetically attaches to the workpiece W, and the posture of the tool becomes more stable. Can be held.

The present invention is not limited to the above embodiment. Those having substantially the same configuration as those described in the claims of the present invention and exhibiting the same operation and effect belong to the technical scope of the present invention. For example, the method of urging the punch rod 3 and the method of urging the positioning pin 12 are arbitrary, and the form of the cutting blade 5 is also arbitrary.

[0025]

As described above, in the punching tool according to the present invention, the body of the punching rod is inserted into the outer cylinder serving as the gripping portion, and a part of the tip of the punching rod is projected from the outer cylinder to the outside. Therefore, it is possible to strike the punching rod while holding the tool in an accurate posture, and it is possible to prevent a problem that the direction of the hole is inclined or the position is shifted. Further, by projecting a part of the tip of the punching rod to the outside of the outer cylinder, the tool can be set at an accurate position when the tool is first positioned at the drilling position. Claim 2
In this case, if the tip of the positioning pin is projected from the center of the tip cutting blade of the punching rod, the initial positioning can be performed more accurately.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a punching tool according to the present invention.

FIG. 2 is a bottom view of a punching tool.

FIG. 3 is an external view illustrating a state at the time of drilling.

FIGS. 4A and 4B are action diagrams, wherein FIG. 4A is a positioning diagram, FIG. 4B is a diagram showing a state in which an outer cylinder is pushed down, and FIG.

FIG. 5 is an explanatory view of a conventional punching tool.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Punching tool, 2 ... Outer cylinder, 3 ... Punching rod, 5
... cutting blade, 7 ... head part, 10 ... urging member, 11 ... hole,
12: positioning pin, 13: urging member.

Claims (2)

[Claims] 1. A punching rod having a cutting blade formed at a distal end and having a head portion at a base end side, and an outer cylinder through which a body portion of the punching rod is slidably inserted and used as a gripping portion at the time of punching. The punching tool is characterized in that the punching rod is urged toward the distal end by an urging member, and at least a part of the distal end projects outward from the outer cylinder. 2. The punching tool according to claim 1, wherein a tip of a resiliently supported positioning pin protrudes from the center of the tip cutting blade of the punching rod, and the positioning pin is located at the center of the punching rod. A punching tool characterized in that it can be immersed in a hole formed in the hole.