Cardboard box handle hole cutter

Abstract

This invention provides a device that uses an elliptical metal plate with a cutter to easily, quickly, safely, and cleanly punch holes such as handle holes in cardboard boxes. [Solution] By pressing three mountain-shaped cutters 2 into the desired positions on the upper part of the left and right short sides 6 of the cardboard box, the mountain-shaped cutters 2 cut the cardboard, simultaneously punching semicircular holes on both sides of the oval-shaped hole and a straight line connecting their lower ends, thereby creating the handle hole.

Description

Technical Field

[0001] The present invention relates to a punching tool for punching a handle hole (hereinafter referred to as "the hole") in a box such as a cardboard box that does not initially have a handle hole (a shape obtained by rotating the letter "C" 90 degrees to the left) by attaching a blade to a metal plate so that the hole can be punched.

Background Art

[0002] Conventionally, boxes with and without the hole initially punched in the upper part of the left and right short sides of cardboard boxes have been in circulation. (See Patent Document 1) Also, those related to jigs and punching methods for punching holes in a desired range of cardboard use a plurality of jigs to punch holes with large and small nails to create handle holes. (See Patent Document 2)

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Therefore, there were the following problems. (i) When loading and transporting goods in a cardboard box with the hole initially punched, it is possible to easily carry the box by bending the waist slightly and inserting fingers other than the thumbs of both hands into the hole on the upper part of the left and right sides and lifting it. However, when transporting a cardboard box without the hole, it is necessary to bend down greatly, scoop up both ends of the bottom surface under the left and right sides of the box with both fingers, lift it up greatly, and hold it in the arms. Therefore, it is difficult to insert fingers between the bottom of both sides and the floor, the hands get dirty, it is slippery, and it is difficult to hold in an unstable state. (b) If the holes were to be made by hand, it would have to be done using a utility knife, scissors, or compass, which would be time-consuming, the cut surface of the holes would be uneven, the holes on both sides would be uneven and look bad, and cutting would be difficult, there would be risks of cutting too much, it would be a nuisance, and there would be a risk of slipping and getting injured. (h) In the aforementioned Patent Document 2, the device consists of three jigs, and first a positioning hole is drilled, and then the jigs are sequentially changed based on that hole to drill closely spaced, continuous holes with nails of different sizes to create a handhold hole. This is a time-consuming and laborious process, and the resulting holes are uneven. This invention was made to solve these problems. [Means for solving the problem]

[0005] The present invention is a corrugated cardboard box handle hole punching tool characterized by having an oval-shaped cylindrical metal plate with three mountain-shaped cutters on one side, a handle on the other, and a stopper in the center, and by pushing this handle hole cutter into a corrugated cardboard box that does not originally have such a hole until it reaches the stopper to punch the hole. [Effects of the Invention]

[0006] This invention involves using a V-shaped cutter with its tips positioned lightly against the center of the semicircular outer perimeter on both sides of an ellipse, connecting the center of the semicircular outer perimeter with the endpoints of the outer perimeter on both sides. By lightly touching the cutter to the desired position on the upper part of the left and right short sides of a cardboard box, the cutter's tip penetrates the material, fixing the position of the hole to be punched. As the cutter is pushed inward from each V-shaped cutter tip simultaneously, it slides inward, cutting along the sharp blades of each slanted surface, cutting through the curves at both ends of the ellipse in one go. This allows for easy and safe punching of any number of holes quickly, evenly, and beautifully with minimal effort. Furthermore, the cutter is simple and compact, making it easy to manufacture and carry. [Brief explanation of the drawing]

[0007] [Figure 1] This is a front view of the present invention. [Figure 2] This is a side view of the present invention. [Figure 3] This is a plan view of the present invention. [Figure 4] This is a cross-sectional view of the mountain-shaped cutter blade of the present invention. [Figure 5] This is a perspective view showing an embodiment of the present invention. [Modes for carrying out the invention]

[0008] The following describes embodiments for carrying out the present invention. (i) A metal plate is formed into an oval-shaped cylinder and secured with rivets 4. Three mountain-shaped cutters 2 are placed on the top of the main body, one on each side and one in the center, and a stopper 3 is placed in the center. (See Figure 1.2.3) (b) Each of the three mountain-shaped cutters 2 has a sharp blade 5 attached to both the left and right slanted ends by cutting diagonally from the inside and outside. (See Figure 4) (h) All edges of the metal plate, except for the three mountain-shaped cutters 2, are chamfered to help prevent injuries to the fingers. (ii) In addition, although the example shown in the figure assumes the punching of an oval-shaped handle hole, the present invention is not limited to this and can be broadly applied when punching various shapes in corrugated cardboard. (e) In the example shown in Figure 1, there are three V-shaped cutters, but the number of cutters is not limited to three. (H) The most preferable material for this main body metal plate is stainless steel, which is rust-resistant, robust, and clean. (t) In the example shown in Figure 1.2.3, the metal plate is fixed to an elliptical cylindrical shape with rivets, but the method is not limited to rivets. (C) If the cutter is rotated 180° again after the hole has been made and pushed into the hole, the connected part at the top inside of the hole will also be cut, creating a perfectly oval-shaped hole. The present invention has the configuration described above. When using this invention, the stopper 3 of the main body 1 is turned upward, the grip portion 7 is grasped to determine the position of the hole to be made on the upper side 6 of the cardboard box, the tips of the three mountain-shaped cutter portions 2 are applied and the main body 1 is slowly pushed in, and the sharp blades 2 of the mountain-shaped cutters push up to the stopper 3 to complete the hole smoothly and with a clean cut surface. When actually using the hole to carry the box, the center of the hole made on the upper left and right short sides is pushed inward and folded inward, and the fingers other than the thumb are inserted on the left and right sides of the fully made hole to carry it. [Explanation of symbols]

[0009] 1 Main unit 2. Mountain-shaped cutter 3 Stopper 4 rivets 5 blades 6 Cardboard box side 7. Grip a. Direction to push

Claims

1. A corrugated cardboard box handle hole punching device characterized by having a metal plate in the shape of an oval cylinder, with three mountain-shaped cutters on one side, a handle on the other side, and a stopper in the center, and by pushing this handle hole cutter into a corrugated cardboard box that does not initially have such a hole until it reaches the stopper, the handle hole punching device is used to punch the hole.

2. The aforementioned mountain-shaped cutter is a cardboard box handle hole punching tool having sharp blades on each of its left and right slopes.

3. A corrugated cardboard box handle hole punching device, wherein the mountain-shaped cutters on both sides have a U-shaped cross-section, and the mountain-shaped cutter in between has a straight cross-section.

4. The stopper is installed beyond the left and right end points of the central mountain-shaped cutter section, and is part of a cardboard box handle hole punching device.

5. A corrugated cardboard box handle hole punching device, wherein the metal plate edges other than the blade of the aforementioned mountain-shaped cutter are rounded.

6. A cardboard box handle hole punching device in which the longer end of an oval-shaped metal plate has an inner diameter large enough to fit the four fingers of an average adult male excluding the thumb.

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