JPH05228851A - Knock-out punching tool - Google Patents

Abstract

PURPOSE:To provide a knock-out punching too, which can form a knock-out hole easily and securely without generating the crack at the time of forming a knock-out hole in the side wall of a box or the like. CONSTITUTION:This knock-out hole punching tool 10 has the structure like a cutting pliers and provided with two shanks 18, 19 crossing each other. The tip of one of the shanks 18, 19 is provided with a support part made of a support body 11, which is formed into a circular-shape in response to the shape of a circular knock-out 22, and the tip of the other shank is provided with a punching part made of a prism-shape punching body 12. The shanks 18, 19 of the knock-out hole punching toll 10 are gripped to lower the punching body 12 to the center of the support body 11 and project the tip of the punching body 12 to the opposite side to punch the knock-out 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knockout punching tool used when punching a punchable knockout provided on a side wall of a box or the like.

[0002]

2. Description of the Related Art As shown in FIGS. 8 and 9, a side wall 21 of a box 20 formed of a hard synthetic resin is
A knockout 22 for connecting a conduit is provided through the main body of the box 20 and the thin wall 23, or, as shown in FIG. 10, through the main body of the box 20 and three or four connecting portions 24.

Conventionally, when the knockout 22 is to be opened, as shown in FIG. 10, a driver 30 or a hammer or the like is used to strike and break the thin wall 23 or the knockout 22 connected by a connecting portion.

However, in such a method of knocking knockouts to form knockholes, the impact tends to cause cracks in the peripheral wall of the knockout, which may damage the wall in extreme cases. There was a problem.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the present invention is to cause cracks to occur in parallel with a wall forming a knock hole such as a side wall of a box. The object is to provide a knockout opening / puncturing device that can easily and reliably form a knock hole.

[0006]

[Means for Solving the Problems] That is, in order to achieve the above-mentioned object, the means adopted by the present invention is "a knockout punching device for punching a punchable knockout provided on a side wall of a box or the like. There is provided a knockout portion for punching out a knockout from one side of the side wall, and a support portion arranged on the other side of the side wall for punching out the knockout and supporting a wall around the knockout peripheral edge. The gist is "open puncture device".

[0007]

In the knockout opening and piercing device according to the present invention,
The knock hole can be formed by punching from the other surface of the wall with the punching portion in a state where the supporting portion is supported by abutting against one surface of the wall forming the knock hole. In this case, the supporting portion supports the wall of the knockout peripheral edge to reinforce the impact resistance against punching by the punching portion, and prevents the wall of the knockout peripheral edge from cracking.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 shows an embodiment of a knockout opening / puncturing device according to the present invention.
Is a pliers-like structure with two intersecting handles 18, 19. At one end of each of the handles 18, 19 is provided a support portion composed of a support body 11 formed in an arc shape corresponding to a circular knockout shape. On the other hand, a punching portion including a punching body 12 having a prismatic shape is provided. Then, by grasping the handles 18, 19 of the knockout opening / puncturing device 10, the punching body 12 can be lowered to the center of the support body 11, and the tip of the punching body 12 can be projected to the opposite side.

Therefore, the knockout opener 10
When a knock hole is formed in the knockout 22 provided on the side wall 21 of the box 20 by using, as shown in FIG. 2, a circular arc shape that is a support portion inside the side wall 21 from the opening side of the box 10 is formed. Support 11 is inserted, the upper surfaces of the support 11 are applied to the periphery of the knockout 22, the handles 18, 19 are grasped, and the punching body 12 and the support 11 are held.
The side wall 21 of the box 20 is sandwiched between and. Then, FIG.
As shown in FIG. 5, the handles 18, 19 are strongly gripped to punch the knockout 22 at the tip of the punched body 12 to form a knock hole. At this time, knockout 22
Since the peripheral edge of is supported by the support body 11, the impact of the punching by the punching body 12 does not reach the periphery of the knockout 22 and cause the side wall 21 to crack.

In the knockout opening / puncturing device 10, in the punched state, the support 1 is arranged so that the handle 19 to which the punched body 12 is attached does not hit the side wall 21.
A space equal to or larger than the thickness of the side wall 21 is provided between the handle 18 and the handle 18 and the side wall 21 is not damaged.

The shape of the supporting portion may be a circular supporting body in addition to the arc-shaped supporting body 11 described above, or may be another shape, which can support the wall of the knockout peripheral edge. If Further, the upper surface of the support body 11 may be provided with rubber for preventing slippage with the abutting wall, or with anti-slip means having an uneven surface.

Further, the handle 18 to which the support 11 is attached may be graduated so that the support 11 can be easily aligned with the knockout 22. Further, as shown in FIG. 4, for example, a box 20 is provided at the base of the support 11 so that the support 11 can be easily fixed in position.
A sandwiching piece 13 for sandwiching the side wall 21 may be provided.

Further, the punching portion is not limited to the above-mentioned prism-shaped punching body 12, but may have another shape, and the lower end of the punching body 12 may be flat or pointed. Also, as shown in FIG.
It is also possible to use the punched body 12 in which the 2a is inclined along the circumferential direction so as to gradually come into contact with the knockout. In the case of this punching body 12, when punching,
Since the thin portion of the knockout or the connecting portion is sequentially punched from the most traveled portion of the lower end 12a, punching can be performed with a smaller force than in the case of punching all at once, and the work is easy and convenient.

FIG. 6 shows another embodiment of the knockout opening / piercing device. The knockout opening / piercing device 10 has a form of a support portion for supporting the wall of the periphery of the knockout and knocking out the knockout with the punching body 12. Of the receiving part 11 to prevent the inclination of the
It is composed of a support 11 having a. That is, as shown in FIG. 7, the knockout 22 to be punched does not hit the receiving portion 11a of the support body 11 and further tilts, and the thin wall 23 or the connecting portion of the knockout 22 is left uncut due to the shearing force of the punching body 12 applied. It is designed to be punched without fail. In such a knockout opening / puncturing device 10, the size of the knockout 22 varies, and the knockout 22 is particularly large.
When the punching body 12 deviates from the center of the knockout 22 when punching, the state in which the thin wall 23 of the knockout 22 or the connecting portion is partially left uncut can be eliminated. The form of the receiving portion 11a has a structure in which a part of the knockout 22 that is inclined at the time of punching is locked so that the knockout 22 is not punched out by leaving the thin wall 23 or the connecting portion. I wish I had it. Although the punched-out knockout 22 is not necessary, if the receiving portion 11a is formed in a dish shape, the knockout 22 that becomes unnecessary dust is collected together with the receiving portion 11a, which is convenient and easy to collect.

The knockout opening / piercing device according to the present invention is not limited to the one having the pliers structure as in the above-mentioned embodiment, but may be a punching type in which the punching part slides up and down.

[0016]

As described above, according to the present invention, by using the knockout opening / piercing device constructed as described above, it is possible to easily and surely form the knock hole. Further, the wall is not cracked, and the excellent effect that the work of forming the knock hole can be performed efficiently and at ease.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a knockout perforator according to the present invention.

FIG. 2 is a side view showing a use state of the knockout opening / puncturing device shown in FIG. 1 and a state before punching.

FIG. 3 is a side view showing a use state of the knockout opening / puncturing device shown in FIG. 1 and a state after punching.

FIG. 4 is a cross-sectional view showing another example of the support portion in a use state.

FIG. 5 is a perspective view showing another embodiment of the knockout perforator according to the present invention.

FIG. 6 is a perspective view showing still another embodiment of the knockout perforator according to the present invention.

FIG. 7 is a side view showing a use state of the knockout opening / puncturing device shown in FIG. 6.

FIG. 8 is a perspective view showing a conventional method of forming a knock hole in a box.

FIG. 9 is a cross-sectional view showing a knockout form.

FIG. 10 is a plan view showing another knockout configuration.

[Explanation of symbols]

 10 Knockout Opening Tool 11 Support 12 Punching Body 13 Clamping Piece 20 Box 21 Sidewall 22 Knockout 23 Thin Wall 24 Connection Part

Claims (1)

[Claims] 1. A knockout punching tool for punching a knockoutable knockout provided on a side wall of a box, the punching part punching out the knockout from one side of the side wall, and the punching out step when punching out the knockout. A knockout perforator comprising: a support portion that is disposed on the other side of the side wall and that supports a wall around the knockout peripheral edge.