KR102609691B1 - Hole cutter - Google Patents

Abstract

The present invention relates to a hole cutter, and includes a drill holder that can be connected to a power supply unit, a cutter connection part detachably coupled to the drill holder, a cutter body having a cutting part and removably connected to the cutter connection part, and one end of the It includes a drill bit that is separably connected to the drill holder and whose other end is exposed to the outside of the cutter body.
The outer circumference of the cutter connection portion and the outer circumference of the cutter body lie on the same plane, and the inner circumference of the cutter connection portion is closer to the drill bit than the inner circumference of the cutter body.

Description

Hole cutter{HOLE CUTTER}

The present invention relates to a hole cutter.

A hole cutter is a tool that is useful for making holes with a certain diameter or more in plates of various materials such as thin steel plates, wooden doors, sandwich panels, etc. It is used by being mounted on the power supply unit.

This hole cutter includes a cutter body with a cutting part formed at one end, and a coupling holder formed integrally with the other end of the cutter body and mounted on the power supply unit. The cutter body has a predetermined thickness and is made of metal such as carbon tool steel or carbon alloy steel. The cutting part is manufactured by welding multiple cutting tips made by mixing, molding, and sintering diamond particles and metal powder of a specific component. Additionally, one end of the cutter body may be processed into a sawtooth shape to form a cutting part.

However, such cutting tips may wear out or fall off due to impact, resulting in damage to the hole cutter. In this case, the entire hole cutter had to be replaced, resulting in material loss as well as waste of hole cutter materials and increased purchase costs.

Registered Patent No. 10-0558308 (2006.02.28.) Registered Utility Model Publication No. 20-0243511 (2001.08.08.)

The present invention provides a technology that can reduce replacement costs due to damage to the cutting part of a hole cutter.

A hole cutter according to an embodiment of the present invention includes a drill holder that can be connected to a power supply unit, a cutter connection part removably coupled to the drill holder, a cutter body that has a cutting part and is separably connected to the cutter connection part, and It includes a drill bit whose one end is removably connected to the drill holder and whose other end is exposed to the outside from the cutter body.

The outer circumference of the cutter connection portion and the outer circumference of the cutter body are on the same plane, and the inner circumference of the cutter connection portion may be closer to the drill bit than the inner circumference of the cutter body.

The lower side of the cutter connection part may be inserted into the upper side of the cutter body and screwed together.

The cutter connection part may include a threaded portion coupled to the cutter body, a connecting body connected to the threaded portion and exposed to the outside of the cutter body, and a flange that protrudes from the upper surface of the connecting body and supports the drill holder. there is.

The screw portion may include a square screw.

The length of the cutter connection portion may be shorter than the length of the cutter body.

The length ratio of the connecting body and the cutter body may be 1:2 to 5.

The ratio of the length of the drill bit exposed to the outside of the cutter body and the length of the cutter body may be 1:3.5 to 4.

The length of the cutter body may be 140 to 180 mm, and the diameter of the drill bit may be 10 to 15 mm.

The outer circumferential diameter of the cutter body may be 64 to 127 mm, and the diameter of the drill bit may be 10 to 15 mm.

The hole cutter may further include a chip discharge jig portion that is movably disposed inside the cutter body.

At least two guide holes may be formed in a spiral shape along the longitudinal direction of the cutter body.

The chip discharge jig portion has a discharge body disposed between the outer circumference of the drill bit and the inner circumference of the cutter body, is rotatably disposed on the discharge body, and can come into contact with cutting chips flowing into the inside of the cutter body. It may include a plurality of pressure rollers and a guide bar that protrudes from the discharge body and is exposed to the outside of the cutter body through the guide hole.

The guide bar may include a main guide connected to the discharge body and located in the guide hole, and a stopper disposed outside the cutter body and removably connected to the main guide.

The outer circumferential diameter of the stopper may be larger than the diameters of the main guide and the guide hole.

The hole cutter may further include an adapter disposed on the cutter body and to which the cutter connection part is detachably coupled.

According to an embodiment of the present invention, the cutter connection part and the cutter body having the cutting part are coupled and separable by screwing, so that when the cutting part is damaged, the cutter connecting part and the cutter body can be easily replaced in the field, and when the cutting part is damaged, the hole cutter can be replaced. Price competitiveness can be greatly increased by replacing only the cutter body rather than replacing the entire product.

According to an embodiment of the present invention, the length of the cutter body is formed to be relatively longer than the length of the cutter connection portion, so that thick sandwich panels, etc. can be perforated in one operation, enabling stable work, and reducing work time by not performing the work multiple times. Shortening it can help improve worker efficiency.

According to an embodiment of the present invention, cutting chips introduced into the cutter body through a perforation in a plate can be discharged to the outside of the cutter body using a chip discharge jig portion disposed inside the cutter body. At this time, the chip discharge jig rotates and descends along the spiral guide hole of the cutter body, so the cutting chip pressing force is improved and the cutting chip discharge can be increased.

According to an embodiment of the present invention, an adapter to which the cutter connection part is coupled is formed on the upper surface of the cutter body. Accordingly, cutter bodies of various sizes can be combined with one cutter connection, improving the operator's workability when drilling a panel.

1 is a perspective view showing a hole cutter according to an embodiment of the present invention.
Figure 2 is a cross-sectional perspective view showing the inside of the hole cutter of Figure 1.
Figure 3 is an exploded perspective view of the hole cutter of Figure 1.
Figure 4 is a state diagram of using the hole cutter of Figure 1.
Figure 5 is a perspective view showing a hole cutter according to another embodiment of the present invention.
Figure 6 is an enlarged view showing the chip discharge jig portion of Figure 5.
Figure 7 is a state diagram of using the hole cutter of Figure 5.
Figure 8 is a schematic diagram showing a hole cutter according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Throughout the specification, similar parts are given the same reference numerals.

Next, a hole cutter according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4.

Figure 1 is a perspective view showing a hole cutter according to an embodiment of the present invention, Figure 2 is a cross-sectional perspective view showing the inside of the hole cutter of Figure 1, Figure 3 is an exploded perspective view of the hole cutter of Figure 1, and Figure 4 is a perspective view of the hole cutter of Figure 1. This is the state of using the hole cutter.

Referring to Figures 1 to 4, the hole cutter 1 according to this embodiment includes a drill holder 10, a cutter connection part 20, a cutter body 30, and a drill blade 40, and is used for cutting of the hole cutter. Reduces replacement costs due to damage to parts.

The drill holder 10 and the cutter connection part 20, the cutter connection part 20 and the cutter body 30, and the drill holder 10 and the drill blade 40 are coupled to each other in a screw manner so that they can be separated from each other.

A connection part 11 is formed on the upper side of the drill holder 10, which is connected to a power supply part (not shown) such as a core drill or drill machine. A keyway or the like is formed in the connection portion 11. A coupling portion 12 is formed on the lower side of the drill holder 10, and the coupling portion 12 consists of a flange 121 and a threaded portion 122. The threaded portion 122 is formed below the flange 121, and the outer peripheral diameter of the threaded portion 122 is smaller than the outer peripheral diameter of the flange 121. Accordingly, a step is formed between the threaded portion 122 and the flange 121. The threaded portion 122 includes a triangular screw.

Meanwhile, a coupling groove (not shown) open downward is formed inside the coupling portion 12.

The drill bit 40 has a preset length and its upper end is inserted into the coupling groove. A headless bolt (not shown) that secures the drill bit 40 is coupled to the coupling portion 12 so that the drill bit 40 does not fall out of the coupling groove.

The cutter connection part 20 includes a connection body 21 and a threaded part 23, and connects the drill holder 10 and the cutter body 30.

The interior of the connection body 21 is open toward the bottom, and a fastening hole 222 into which the screw portion 122 is fastened is formed on the upper surface. A flange 22 in contact with the flange of the drill holder 10 protrudes from the upper surface of the connection body 21 where the fastening hole 222 is formed. The protruding length of the flange 22 is greater than the thickness of the connecting body 21. The peripheral thickness of the fastening hole 222 can be reinforced by the protrusion of the flange 22. Accordingly, the coupling force between the drill holder 10 and the connection body 21 can be improved.

The threaded portion 23 extends vertically downward to the lower part of the connecting body 21. The threaded portion 23 includes a square screw. The outer circumferential diameter of the threaded portion 23 is smaller than the outer circumferential diameter of the connecting body 21. Accordingly, a step is formed around the outer circumference of the cutter connection portion 20.

Meanwhile, the vertical length of the connecting body 21 and the vertical length of the threaded portion 23 may be formed in a 1:1 ratio. However, the length of the threaded portion 23 may be formed to be longer than the length of the connection body 21.

The cutter body 30 is perforated up and down on the inside and has a preset length. The ratio of the length of the connection body 21 to the length of the cutter body 30 may be 1:2 to 5. If the ratio is less than 1:2, thick panels cannot be drilled, and if the ratio is more than 1:5, it is difficult to remove cutting chips introduced into the cutter body 30.

Accordingly, the length of the cutter body 30 is formed to be longer than the length of the connection body 21. In addition, the ratio of the overall length of the cutter connection portion 20 in the vertical direction and the overall length of the cutter body 30 may be 1:2. The length ratio of the cutter body 30 and the connecting body 21 may vary depending on the design of the hole cutter (1).

The inner circumference of the upper side of the cutter body 30 surrounds the threaded portion 23. At this time, the outer circumference of the cutter body 30 and the outer circumference of the connecting body 21 are formed to have the same diameter, so that the outer circumference of the cutter body 30 and the outer circumference of the connecting body 21 are located on the same plane. That is, since there is no step formed around the outer circumference of the hole cutter 1, the outer circumference of the hole cutter 1 and the panel do not interfere when the hole cutter 1 drills a panel.

Accordingly, the threaded portion 23 is screwed to the inside of the upper side of the cutter body 30 so that it can be inserted and separated. A sawtooth-shaped cutting portion 31 is formed on the lower side of the cutter body 30. The cutting unit 31 can cut the panel. A cutting chip (not shown) may be coupled to the cutting portion 31.

The inner circumference diameter of the cutter body 30 is formed to be larger than the inner circumference diameter of the connection body 21, so that the inner circumference of the connection body 21 is closer to the outer circumference of the drill bit 40 than the inner circumference of the cutter body 30. It's closer. Accordingly, a step is formed around the inner circumference of the cutter body 30 and the cutter connection portion 20.

Meanwhile, when the cutter body 30 is coupled to the connection body 21, a portion of the lower part of the drill bit 40 is exposed to the outside of the cutter body 30. At this time, the ratio of the length of the drill bit 40 exposed to the outside from the cutter body 30 and the length of the cutter body 30 may be 1:3.5 to 4. That is, the exposed length of the drill bit 40 is shorter than the length of the cutter body 30. If the ratio is less than 1:3.5, it is difficult to form a center hole in the panel, and if it exceeds 1:4, the drill bit may be damaged during the center hole formation process. Accordingly, the drill bit 40 can stably form a drilling center in the panel.

Additionally, when the length of the cutter body 30 is 140 to 180 mm, the diameter of the drill bit 40 may be 10 to 15 mm. And when the outer circumferential diameter of the cutter body 30 is 64 to 127 mm, the diameter of the drill bit 40 may be 10 to 15 mm. If the diameter of the drill bit 40 is less than 10 mm, shaking of the hole cutter may occur during the center hole formation process, and if it exceeds 15 mm, the weight of the hole cutter may increase.

When the length of the cutter body 30 is 140 to 180 mm and the outer circumferential diameter is 64 to 127 mm, the diameter of the drill bit 40 is formed to be 10 to 15 mm, so it is possible to compensate for the shaking of the drill bit 40 when drilling a panel. there is.

Accordingly, the drill holder 10 to which the drill blade 40 is coupled is coupled to the cutter connection portion 20, and when the cutter connection portion 20 and the cutter body 30 are coupled, a portion of the drill blade 40 is connected to the cutter body 30. It is exposed to the lower part of (30).

When the connection portion 11 of the drill holder 10 is coupled to the power provider, the hole cutter 1 can rotate due to the rotational force of the power provider. At this time, the end of the drill bit 40 exposed to the outside of the cutter body 30 forms a center hole in the panel P, and when the cutting portion 31 contacts the panel, a cutting hole is formed in the panel P. At this time, the cutting chips (PC) generated as the cutting hole is formed in the panel are inserted into the cutter body 30.

In this way, if the cutting portion 31 is damaged when the cutter body 30 drills the panel P, the cutter body 30 can be separated from the cutter connection portion 20 and only the cutter body 30 can be replaced. Accordingly, price competitiveness can be greatly increased by replacing only the cutter body 30 rather than replacing the entire hole cutter.

In another embodiment of the present invention, the hole cutter 2 has most of the components of the embodiment described with reference to FIGS. 1 to 4 and further includes a chip discharge jig portion.

Referring to FIGS. 5 to 7, the chip discharge jig portion 50 includes a discharge body 51, a pressure roller 52, and a guide bar 53, and is arranged to be movable inside the cutter body 30. Cutting chips introduced into the cutter body 30 are discharged to the outside of the cutter body 30.

A guide hole 32 is formed around the outer circumference of the cutter body 30 according to this embodiment. The guide hole 32 is formed in a spiral shape. However, the guide hole 32 may be formed as a straight line in the vertical direction. At least two guide holes 32 are formed.

The discharge body 51 is arranged to be movable inside the cutter body 30 and has an inner center penetrating upward and downward. Accordingly, the discharge body 51 is located between the outer circumference of the drill bit 40 and the inner circumference of the cutter body 30 and is spaced apart from the other.

The discharge body 51 is formed with an arrangement hole 511 penetrating in the vertical direction. A plurality of arrangement holes 511 are formed at intervals along the circumferential direction of the discharge body 51.

The pressure roller 52 is rotatably disposed at each placement hole 511. The pressure roller 52 protrudes from the upper and lower surfaces of the discharge body 51. The portion of the pressure roller 52 located on the lower side of the discharge body 51 may be in contact with the cutting chip (PC). The pressure roller 52 may rotate while coming into contact with the cutting chip (PC) when the discharge body 51 is raised and lowered. When the discharge body 51 descends, the pressure roller 52 rotates and can pressurize the cutting chips (PC).

The guide bar 53 includes a main guide 531 and a stopper 532 and guides the discharge body 51 to rise and fall while rotating in a spiral shape inside the cutter body 30.

The main guide 531 has a preset length, one end is connected to the discharge body 51, and the other end is located in the guide hole 32. As the main guide 531 moves along the guide hole 32, the discharge body 51 also moves in a spiral shape and goes up and down.

The stopper 532 is disposed on the outside of the cutter body 30 and is detachably coupled to the other end of the main guide 531. The stopper 532 is in contact with the outer circumference of the cutter body 30 and prevents the discharge body 51 from moving in a direction perpendicular to the drill bit 40 inside the cutter body 30. That is, since the stoppers 532 are located on both sides of the cutter body 30 and are in contact with the cutter body 30, the discharge body 51 can be raised and lowered along the guide hole 32 without shaking.

Accordingly, cutting chips (PC) generated when the hole cutter 1 perforates the panel P flow into the interior of the cutter body 30 and come into contact with the pressure roller 52. At this time, the discharge body 51 moves inside the cutter body 30. The discharge body 51 rotates and moves in a spiral shape by the guide bar 53 of the guide hole 32.

In order to discharge the cutting chips (PC) that have flowed into the cutter body 30 after completing the panel (P) drilling, the chip discharge jig part 50 is formed using the guide bar 53 exposed to the outside of the cutter body 30. ) is pressed to the lower part of the hole cutter 1, the chip discharge jig part 50 rotates and descends in a spiral shape along the guide hole 32, and the pressure roller 52 presses the cutting chip (PC). Since the chip discharge jig part 50 rotates in a spiral shape, the pressure roller 52 rolls on the cutting chip (PC). By pressurizing the chip discharge jig portion 50, cutting chips (PC) flowing into the inside of the cutter body 30 can be quickly discharged.

For other configurations, the configurations of the embodiments of FIGS. 1 to 4 may be applied as is.

Another embodiment of the present invention has most of the components of the embodiment described with reference to FIGS. 1 to 7 and further includes an adapter.

Referring further to FIG. 8, the cutter body 30 has an upper surface, and an adapter 60 protrudes from the upper surface. The adapter 60 is formed integrally with the cutter body 30, and the outer circumferential diameter of the adapter 60 may be smaller than or equal to the outer circumferential diameter of the cutter body 30.

Meanwhile, the outer circumferential diameter of the cutter body 30 is formed in various ways, and an adapter 60 is formed integrally with each other on the upper surface of the cutter body 30. Accordingly, multiple cutter bodies 30 can be used using one cutter connection portion 20, thereby improving user workability and usability.

For other configurations, the configurations of the embodiments of FIGS. 1 to 7 may be applied as is.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims are also possible. falls within the scope of rights.

1: Hole cutter 10: Drill holder
11: connection part 12: coupling part
121: Flange 122: Threaded portion
20: cutter connection 21: connection body
22: Flange 222: Fastening hole
23: Threaded portion 30: Cutter body
31: cutting part 32: guide hole
40: Drill bit 50: Chip discharge jig part
51: discharge body 511: placement hole
52: Pressure roller 53: Guide bar
531: Main guide 532: Stopper
60: adapter

Claims (13)

A drill holder that can be connected to a power supply unit, a cutter connection part removably coupled to the drill holder, a cutter body having a cutting part and a cutter body that is removably connected to the cutter connection part, and one end of which is separably connected to the drill holder. In the hole cutter including a drill bit whose other end is exposed to the outside from the cutter body,
It includes a chip discharge jig portion that is movably disposed inside the cutter body and discharges cutting chips introduced into the cutter body to the outside of the cutter body,
The cutter body has two guide holes formed in a spiral shape along the longitudinal direction,
The chip discharge jig part,
A discharge body disposed to be movable between the outer circumference of the drill bit and the inner circumference of the cutter body, and having a plurality of arrangement holes penetrating in the upper and lower directions along the circumferential direction, protruding from the upper and lower surfaces of the discharge body. It includes a pressure roller rotatably installed in the arrangement hole and a guide bar protruding from the discharge body and exposed to the outside of the cutter body through the guide hole,
The guide bar has one end connected to the discharge body and the other end located in the guide hole, and is detachably coupled to the main guide that moves along the guide hole and causes the discharge body to move in a spiral shape and rise and fall, and the other end of the main guide. and includes a stopper installed to contact the outer circumference of the cutter body to prevent shaking when the discharge body is raised and lowered,
An upper surface is formed on the cutter body, and an adapter that is screwed to the lower part of the cutter connection is integrally protruded from the upper surface, so that cutter bodies with various outer circumference diameters can be connected using one cutter connection.
Hole cutter. In paragraph 1:
A hole cutter wherein the lower side of the cutter connection portion is inserted into the upper side of the cutter body and screwed together. In paragraph 2,
The cutter connection part,
A threaded portion coupled to the cutter body,
A connecting body connected to the threaded portion and exposed to the outside of the cutter body, and
A flange protrudes from the upper surface of the connection body and supports the drill holder.
containing
Hole cutter. delete delete In paragraph 3,
A hole cutter where the length ratio of the connecting body and the cutter body is 1:2 to 5. In paragraph 1:
A hole cutter where the ratio of the length of the drill bit exposed to the outside of the cutter body and the length of the cutter body is 1:3.5 to 4. In paragraph 1:
A hole cutter wherein the length of the cutter body is 140 to 180 mm, and the diameter of the drill bit is 10 to 15 mm. In paragraph 1:
A hole cutter wherein the outer circumferential diameter of the cutter body is 64 to 127 mm, and the diameter of the drill bit is 10 to 15 mm. delete delete delete delete

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