Cardboard box handle hole punching tool with safety cover and stick

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] The present invention provides a hand-operated hole punching tool A with a safety cover 8 and a stick 7, comprising a main body 1 made of a metal plate in the shape of an oval cylinder with three mountain-shaped cutters 2 on one side, a safety cover 8 provided around the main body, and a gripping stick portion 7 provided at one end of the main body 1, with a stopper screw 3 placed in the center of the stick portion 7 to pull the main body into the safety cover 8.

Description

Technical Field

[0001] The present invention relates to a safety cover with a blade attached to a metal plate and a perforating tool with a stick, which can be used to punch 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).

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, regarding a jig and a perforating method for punching holes in a desired range of cardboard, a plurality of jigs are used 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. (a) 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 the 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 in a cardboard box without the hole, it is necessary to bend down deeply, scoop up both ends of the bottom surface under the left and right sides of the box with both fingers, and lift and hold it large, so it is difficult to insert the fingers between the bottom of both sides and the floor, the hands get dirty, are 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] To solve the aforementioned problems, the present invention is a corrugated cardboard box handle hole punching tool characterized by comprising a main body made of a metal plate in the shape of an elliptical cylinder and having three mountain-shaped cutters on one side, a safety cover provided around the main body, and a grip stick portion provided at one end of the main body, with a stopper screw placed in the center of the stick portion, and the main body being pulled into the safety cover. [Effects of the Invention]

[0006] In this invention, the tips of each mountain-shaped cutter are positioned in the center of the straight line connecting the semicircular outer perimeter center on both sides of an ellipse and the endpoints of the outer perimeter on both sides. By applying a safety cover to the upper part of the left and right short sides of a cardboard box and pushing further, the position of the hole to be made is fixed, and as you continue to push, the tips of each mountain-shaped cutter are simultaneously pushed inward from the box. By gliding smoothly along the sharp blade of the surface, the cutter cuts through the entire elliptical shape, including the curves at both ends, in one go. This eliminates the need for excessive force, and the cut is completed when it reaches the stopper screw. This makes it significantly easier, safer, more stable, faster, and more evenly cut any number of holes with minimal effort. Furthermore, the cutter has a protective cover for the blade and an easy-to-grip handle, making it safe to use, easy to operate, and easily portable. [Brief explanation of the drawing]

[0007] [Figure 1] This is an exploded perspective view of the present invention. [Figure 2] This is a front view of the present invention. [Figure 3] This is a side view of the present invention. [Figure 4] This is a plan view of the present invention. [Figure 5] This is an enlarged cross-sectional view of the mountain-shaped cutter blade of the present invention. [Figure 6] This is a perspective view showing an embodiment of the present invention. [Figure 7-1] This is a diagram illustrating the operation of the present invention. [Figure 7-2] This is a diagram of the operation following Figure 7-1. [Modes for carrying out the invention]

[0008] The following describes embodiments for carrying out the present invention. As shown in Figure 1, the corrugated cardboard box handle hole cutter A of the present invention comprises a main body 1, a safety cover 8, and a stick 7.

[0009] The main body 1 is made of a metal plate shaped into an oval cylinder large enough to fit the four fingers of an average adult male excluding the thumb, and is fixed with rivets 4a. Three mountain-shaped cutters 2 are placed on the top of the main body, one on each side and one in the center. Only the mountain-shaped cutters on both sides have a U-shaped cross-section, and the edges of the metal plate other than the cutter blades are rounded.

[0010] The safety cover 8 is provided around the main body 1 and is made of a metal plate shaped into an oval cylinder larger than the main body 1, and is secured with rivets 4b. One end of the safety cover 8 is open, and the other end is closed by an end panel 9.

[0011] The stick 7 (grip part) is cylindrical, and the stopper screw 3 is arranged at the center thereof. (Refer to Figs. 1, 2, 3, 6, 7-1, 7-2) One end of the stick 7 is inserted inside the main body 1 and fixed to the main body 1 with a rivet 4c. The other end of the stick 7 penetrates through the hole 9a formed in the end panel 9 and protrudes outside the main body 1. A spring 6 is attached between the stick 7 and the safety cover 8. One end of the spring 6 is fixed to the inner tip of the stick 7, and the other end is fixed to the end panel 9 via an attachment screw 10. (Refer to Figs. 1, 2, 3)

[0012] At both ends of the left and right inclined surfaces of each of the three V-shaped cutters 2, a process of attaching a sharp blade 5 is performed by cutting obliquely from the inside and outside. (Refer to Fig. 5) All the metal plate end corners other than the three V-shaped cutters 2 are chamfered, which helps prevent finger injuries. Also, in the example presented in the figure, it is assumed that an elliptical handle hole is drilled, but the present invention is not limited thereto and can be widely applied when drilling various shapes in cardboard. In the examples shown in Figs. 1, 2, 3, 7-1, 7-2, the number of V-shaped cutters is three, but the number of cutters is not limited to three. The most preferable material for this main body metal plate is stainless steel, which is rust-resistant, firm, and clean. Regarding materials other than the main body metal plate, lightweight, rust-resistant, and firm materials are desirable. In the examples shown in Figs. 1, 2, 6, 7, the metal plate is fixed in an elliptical cylindrical shape with rivets, but it is not limited to rivets. If the cutter is rotated 180° again from the state where the hole is drilled and pushed into the hole, the connected part at the upper part inside the hole will also be cut, and a complete elliptical hole can be formed. The present invention has the above-described configuration.

[0013] When using the present invention, turn the stopper screw 3 of the stick (grip part) 7 upward, determine the position of the hole to be drilled in the upper part of the side surface 6 of the corrugated cardboard box on the grip side of the stick 7, place the tip of the safety cover 8 against it, and slowly push the main body 1 in the X direction (see Fig. 7-1). When the stopper screw 3 hits the safety cover end panel 9 by the sharp blade 2 of the mountain cutter, pushing it in until then will result in a smooth hole with a clean cut surface (see Fig. 7-2). After drilling the hole, pull the stick (grip part) 7 back in the reverse direction of X, and the main body 1 will come out of the drilled hole. The spring 6 acts, and the mountain cutter 2 is automatically stored in the safety cover 8, which helps prevent injuries. When actually using and carrying the hole, push the center of the hole drilled in the upper part of the left and right short sides of the corrugated cardboard box inward, and bend it upward inside. Insert the fingers other than the thumbs of both hands into the left and right sides of the completely drilled hole and carry it.

Explanation of Signs

[0014] A Corrugated cardboard box handle hole cutter 1 Main body 2 Mountain cutter 3 Stopper screw 4a, 4b, 4c Rivets 5 Blade 6 Spring 7 Stick (grip part) 8 Safety cover 9 Safety cover end panel 9a Stick through-hole 10 Safety cover end panel mounting screw 10a Safety cover end panel mounting screw hole 11 Corrugated cardboard box side surface 12 Corrugated cardboard box cross-section X Pushing direction

Claims

1. A cardboard box handle hole punching device comprising a main body made of a metal plate in the shape of an oval cylinder with three mountain-shaped cutters on one side, a safety cover provided around the main body, and a grip stick portion provided at one end of the main body, wherein a stopper screw is placed in the center of the stick portion, and the main body is pulled into the safety cover.

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 cardboard box handle hole punching tool according to claim 1, wherein the stopper screw is installed at the center of the stick (grip portion).

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 of the longer end of the oval-shaped metal plate is large enough to fit four fingers other than the thumb of an average adult male.

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