JPH0315217Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a manual hole punch for punching holes in a workpiece such as a steel plate. This invention relates to a manual hole punch for punching holes in a steel plate when wiring or piping cables, conduits, etc.

Prior Art and its Problems As this type of manual punch, the present applicant has previously proposed Utility Model Publication No. 62-4340, but in this manual punch, the amount of movement of the punch due to opening and closing of the movable handle is constant. When drilling a hole in a steel plate with long and deep rim-shaped side walls, the length of both side walls is longer than the gap between the punch and die, so this steel plate cannot be used because it cannot be set between the punch and die. Alternatively, if the distance between the fulcrums is widened to increase the amount of movement of the punch so that it can pass over both side walls of the steel plate, the drilling magnification decreases or the amount of opening/closing of the handle becomes large, making it difficult to perform the work. There was a problem that sex became extremely poor.

Means and Effects for Solving the Problem The present invention was devised in view of the above-mentioned disadvantages, and consists of two side surfaces of a bifurcated rocking arm rotatably supported by pins on the main body support part and the lever rod. By drilling a bilaterally symmetrical L-shaped elongated hole consisting of a slide part and a fulcrum part, the movable fulcrum pin of the lever attached to the tip of the movable handle can be inserted into the slide part of the L-shaped elongated hole. This means that the punch holder shaft pivotally supported at the tip of the lever can slide by the length of the elongated hole slide portion,
As a result, when setting the workpiece, the punch and the punch holder shaft can be instantly slid to create a large gap between the punch and the die, making it easy to handle the U-shaped steel plate with long rim-shaped side walls. By being able to set it to Therefore, its workability is also extremely good.

Example The explanation will be given below according to the drawings.

The main body 1 has a U-shaped side surface, and a fixed handle 6 is fixedly attached to the back surface thereof. Further, in the main body 1, through holes 4 and 5 are formed in the supporting part 2 and the installation part 3, which are integrally formed and facing each other.

A cylindrical die 7 is installed in a through hole 5 bored in the installation section 3.

The punch holder shaft 9 is slidably fitted into a through hole 4 formed in the support portion 2, and a punch 8 is mounted at the tip thereof facing the die 7.

The L-shaped lever 11 has a movable handle 10 extending behind it, and its tip is pin-supported to the upper end of the punch holder shaft 9 by a pivot pin 12. A movable fulcrum pin 13 is provided protruding from the center.

The rocking arm 14 is formed into a bifurcated shape, and its back part is formed into a contact plate 15, and a slide part 16 and a fulcrum part 17 are symmetrically formed on both sides of the support plate 15, which are integrally formed with the contact plate 15. An L-shaped elongated hole 18 consisting of the following is bored.

The tip of the swing arm 14 is connected to the support portion 2 of the main body 1.
A movable fulcrum pin 13 protruding from substantially the center of the lever 11 is engaged with the L-shaped elongated hole 18 thereof.

Further, a spring 20 is installed between the swing arm 14 and the main body 1, and constantly presses the swing arm 14 forward (in the opposite direction to the fixed handle 6).

The present invention having the above configuration is used when the swinging arm 14 is in a state where the movable handle 10 is closed.
is pressed forward by the elasticity of a spring 20 installed between the contact plate 15 and the main body 1, and as a result, the movable fulcrum pin 13 protruding from the lever 11 is moved to the L-shape of the oscillating arm 14. shaped long hole 1
It is engaged with the fulcrum part 17 of 8.

When the movable handle 10 is expanded in this state, the movable fulcrum pin 13 protruding from the lever 11 rotates around the pivot pin 12. At this time, as mentioned above, since the swing arm 14 is always pressed forward by the elasticity of the spring 20, the swing arm 14 also has a movable fulcrum pin attached to the fulcrum part 17 of the L-shaped elongated hole 18. 13 remains engaged and rotates around the fixed fulcrum pin 19. This rotation of the swing arm 14 about the fixed fulcrum pin 19 is achieved by the contact plate 15
is rotated until the tip comes into contact with the upper surface of the support section 2 of the main body 1.

During the repeated opening and closing operations of the movable handle 10 up to this point, the punch holder shaft 9 with the punch 8 attached to its tip slides up and down in the through hole 4, and together with the die 7 attached facing each other, performs the drilling action of the steel plate. do.

Next, the abutting plate 15 of the swing arm 14
When the movable handle 10 is further expanded after the tip of the lever 11 comes into contact with the upper surface of the support part 2 of the main body 1, the movable fulcrum pin 13 of the lever 11 further rotates around the pivot pin 12, and as shown in FIG. The state shown in Figure 5 will be reached.

After that, by pulling the movable handle 10 upward, the lever 11 moves to its movable fulcrum pin 13.
The punch 8 and punch holder 9 are also pulled upward while being locked to the slide portion 16 of the L-shaped elongated hole 18 of the swing arm 14.
It will be in the state shown in the figure. In this state, as shown in FIG. 6, it becomes possible for the first time to set the U-shaped steel plate A with long rim-shaped side walls between the punch and die.

Effects of the Invention As described above, according to the present invention, due to the action of the L-shaped elongated hole 18 consisting of the slide part 16 and the fulcrum part 17, which are bored on both sides of the bifurcated rocking arm 14, the normal During drilling work, the movable fulcrum pin 13 is engaged with the fulcrum part 17 of the elongated hole 18, and when a U-shaped steel plate with long rim-like side walls is set between the punch and die, the long The movable handle 10 is pulled upward along the slide portion 16 of the hole 18, thereby reducing the magnification by changing the distance between the fulcrum pitches.
Another practical effect is that it is possible to increase the amount of movement of the punch holder shaft without causing inconveniences such as an increase in the amount of opening and closing of the handle, making it possible to drill holes in various steel materials and with extremely good workability. There is something tremendous about it.

[Brief explanation of the drawing]

Figure 1 is a front view of the present invention, Figure 2 is a plan view of the same,
FIG. 3 is a sectional view taken along the line A-A, FIG. 4 is an end view taken along the line B-B, and FIGS. 5 and 6 are explanatory diagrams showing the state of use.

Claims (1)

[Scope of utility model registration request] A fixed handle 6 is fixedly installed at one end, and the through hole 4
A main body 1 having a U-shaped side surface integrally formed with a supporting part 2 having a hole therein and a mounting part 3 having a through hole 5 facing each other, and a die 7 fitted into the through hole 5.
a punch holder shaft 9 slidably mounted in a through hole 4 bored in the support portion 2; and a movable handle supported by a pivot pin 12 at the rear end of the punch holder shaft 9. Lever lever 11 extended from 10
, a bifurcated rocking arm 14 which connects the support portion 2 of the main body 1 and the lever 11 with a fixed fulcrum pin 19 and a movable fulcrum pin 13 and is pressed forward by a spring 20; A hit plate 15 is integrally provided on the swinging arm 14, and a slide portion 16 and a fulcrum portion 17 are symmetrically provided on both sides thereof.
A manual hole punch having an L-shaped elongated hole 18.