JPS624340Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a manual punch for punching holes in workpieces such as steel plates, which has a particularly simple structure, can be provided at low cost, and can always maintain the same hole position in the workpiece. Furthermore, it is possible to easily release the punch from digging into the workpiece after drilling.

This will be explained in detail below. The main body 1 is formed into a substantially inverted U-shape, and consists of an installation part 1a, an arm part 1b, and a die holding part 1c.
c are formed to face each other in the left and right directions, and the installation part 1a has a through hole 2, and the die holding part 1 has a through hole 2.
Through holes 3 are coaxially bored in each of the holes c. Further, an installation handle 20 extends behind the installation section.

The die 4 is fitted into the through hole 3 formed in the die holding portion 1c so as to protrude toward the installation portion 1a side. The die fixing nut 5 is fitted into the through hole 3 from the other side, and the male threaded portion at the tip thereof is threadedly engaged with the female threaded portion of the die 4, thereby firmly fixing the die 4 to the die holding portion 1c. A discharge hole 5a for discharging waste material from the workpiece 21 is passed through the fixing nut 5.

The punch holder shaft 6 is slidably mounted in a through hole 2 bored in the installation portion 1a. A punch 7 is detachably attached to the tip of the punch holder shaft 6, and the rear end is axially connected to the front end of a connecting block 10 by a pivot pin 8.

The connecting block 10 has an operating handle 9 extending from its rear end.

The pair of rocking arms 13 and 14 have their rear ends pivotally supported approximately at the center of the connecting block 10 by a movable fulcrum pin 12, and their front ends pivoted to the fixed fulcrum pin 1.
1 is pivotally supported on the installation part 1a of the main body 1.

In this embodiment, the stripper 16 is formed in a U-shape, and is rotatably attached to the installation portion 1a of the main body 1 by a pin 15. Further, a notch 16a is provided in the top plate portion so as to straddle the punch 7 when the punch 7 is rotated.

In this embodiment, the positioning member 18 is formed in a U-shape, has at least one circular hole 18a, and is fixed to the arm portion 1b of the main body 1 with a fixing screw 17.

To use the present invention having the above configuration, the punch 7 having the diameter and shape (circular, square, etc.) of the hole to be drilled is fixed to the punch holder shaft 6. Next, a die 4 suitable for the punch 7 is selected and fitted into the through hole 3 formed in the die holding part 1c, and the die 4 is fixed to the die holding part 1c by a die fixing nut 5 fitted from the other side. After this, as shown in FIG. 2, in order to keep the drilling position of the workpiece 21 constant, the fixing screw 17 is inserted into the main body 1 at an appropriate position in the circular hole 18a of the positioning member 18.
It is fixed to the arm part 1b of. More stripper 16
Rotate and attach it on the punch 7.

When the operating handle 9 is moved up and down in this state, the connecting block 10 rotates around the pivot pin 8, and this connecting block 10 is connected to the pair of swinging arms 13,
14 and pins 11 and 12, it rotates around the fixed fulcrum pin 11, so the punch holder shaft 6 horizontally slides back and forth along the through hole 2, and the punch 7 A workpiece 21 is drilled.
At this time, the position at which the workpiece 21 is drilled is regulated by the positioning member 18, so the hole is always drilled at a fixed position from the edge, and the punch 7 does not dig into the workpiece 21 after drilling. Tame Punch 7
When the workpiece 21 is moved backward, the workpiece 21 also makes the same movement, but this biting can be canceled by contacting the stripper 16.

As described above, the present invention has an extremely simple structure and configuration, and can therefore be provided at low cost. Furthermore, the positioning member 18 can always maintain a constant drilling position, and can be done in a simple manner. The stripper 16 has excellent practical effects, such as being able to reliably release the punch 7 from digging into the workpiece, resulting in extremely improved workability.

[Brief explanation of the drawing]

FIG. 1 is a front view of the present invention, and FIG. 2 is a sectional view showing the state of use.

Claims (1)

[Scope of utility model registration request] A main body 1 is provided with a die holding part 1c having a through hole 3 at a position facing left and right to the installing part 1a via a U-shaped arm part 1b from an installing part 1a having a through hole 2; Installation part 1a in hole 3
A die 4 fitted from the side, a die fixing nut 5 fitted from the other side of the through hole 3 for fixing the die 4, and a die fixing nut 5 that is slidable into the through hole 2 bored through the installation part 1a. a punch holder shaft 6 mounted on the punch holder shaft 6; a punch 7 fixed to the tip of the punch holder shaft 6; a pair of rocking arms 13 and 14 that connect the installation part 1a of the main body 1 and the connection block 10 by a fixed fulcrum pin 11 and a movable fulcrum pin 12, and the installation part of the main body 1. It consists of a stripper 16 rotatably mounted above 1a with a pin 15, and a positioning member 18 fixed to the arm portion 1b of the main body 1 with a fixing screw 17 and having at least one circular hole 18a bored therein. ,
manual punch.