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 perforating tool for a hole (hereinafter referred to as the hole) having a blade on a metal plate so that the hole can be perforated in a box such as a cardboard box that does not initially have a carrying hole (a shape obtained by rotating the letter C 90 degrees to the left).

Background Art

[0002] Conventionally, boxes with and without the hole initially perforated have been in circulation on the upper parts of the left and right short sides of cardboard boxes (see Patent Document 1). In addition, those related to jigs and perforating methods for perforating cardboard within a desired range use a plurality of jigs to create a carrying hole by perforating a hole with large and small nails (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. (a) When loading and transporting goods in a cardboard box with the hole initially perforated, it is possible to easily carry the box by bending the waist slightly and inserting the fingers other than the thumbs of both hands into the hole on the upper parts of the left and right sides and lifting it. However, when transporting a cardboard box without the hole, it is necessary to squat down greatly, scoop up both ends of the bottom surface under the left and right sides of the box with both hands, and lift and hold it greatly. Therefore, it is difficult to insert fingers between the bottom of both sides and the floor, the hands get dirty, are slippery, and it is difficult to hold the box 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] This invention involves shaping a metal plate into an oval cylinder, with three mountain-shaped cutters on one end and a handle on the other. Between the aforementioned mountain-shaped cutter and the grip portion With stoppers The aforementioned mountain-shaped cutter Cardboard boxes that don't have holes from the start The aforementioned This is a corrugated cardboard box handle hole punching device characterized by punching holes by pushing it all the way to the stopper. [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) The metal plate is made into an oval cylindrical shape and fixed with rivets 4, and mountain-shaped cutters 2 are placed in a total of three places on the top of the main body: left, right, and center. Between the aforementioned mountain-shaped cutter and the grip portion A stopper 3 is placed there. (See Figure 1.2.3) (b) Each of the three mountain-shaped cutters 2 both sides The slanted surface is processed to create sharp edges by cutting diagonally from both 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) Although the example shown in the figure assumes the creation of an oval-shaped handle hole, the present invention is not limited to this and can be broadly applied when creating various shapes of holes 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 tool characterized by having a metal plate in the shape of an oval cylinder, with three V-shaped cutters on one end and a handle on the other, and a stopper placed between the V-shaped cutters and the handle, and punching holes in a corrugated cardboard box that does not have holes from the beginning by pushing the V-shaped cutters up to the stopper.

2. The corrugated cardboard box handle hole punching device according to claim 1, wherein the mountain-shaped cutter has sharp blades on each of its side slopes.

3. The corrugated cardboard box handle hole punching device according to claim 1, wherein the cross-section of the mountain-shaped cutters on both sides of the elliptical major axis perpendicular to the central axis of the cylinder is U-shaped, and the cross-section of the mountain-shaped cutter between the mountain-shaped cutters on both sides perpendicular to the central axis of the cylinder is straight.

4. The corrugated cardboard box handle hole punching device according to claim 1, wherein the stopper is installed between the endpoints of two mountain-shaped cutters that connect to the endpoints on both sides of the mountain-shaped cutter located in the center of the long axis direction of the ellipse.

5. The corrugated cardboard box handle hole punching device according to claim 1, wherein the end face of the metal plate other than the blade of the aforementioned mountain-shaped cutter is rounded.

6. The corrugated cardboard box handle hole punching device according to claim 1, wherein the inner diameter in the long direction of the elliptical cylindrical shape of the metal plate is large enough to fit the four fingers of an average adult male other than the thumb.

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