KR102196558B1 - Undercut Apparatus for Drilling the Bulb Section of Cone Pillar Shape and Drilling Apparatus using Its - Google Patents

Abstract

The present invention relates to an undercut apparatus for drilling a conic pillar shape and a drilling apparatus using the same which drill the end of a bore in a cylindrical shape similar to a bulb anchor standard to insert a conic pillar bulb anchor formed to increase bearing friction on an end of a bolt, nailing, a dowel bar, etc. used in section increases of concrete structures, synthesis with other members, slope reinforcement, tunnel rock reinforcement, etc. The undercut apparatus comprises: a drill guide (1100) having a vertically opened internal space, and an opening groove (1110) longitudinally formed on both sides from the lower end thereof to the outer surface separated by a prescribed distance; a tilting unit (1200) which is fixed on a lower portion of the drill guide (1100), is extended to the internal space, and provides a tilted surface (1210) with a narrow upper portion and a wide lower portion; and a drill unit (1300) which is lifted in the internal space of the drill guide (1100), has a lower portion branching into both sides to be moved along the tilting unit (1200) surface, and has a drill blade (1330) laterally protruding from the branching end to move along the opening groove (1110).

Description

Undercut Apparatus for Drilling the Bulb Section of Cone Pillar Shape and Drilling Apparatus using Its}

The present invention relates to a cone-shaped perforated undercut device for simply drilling the end of a cylindrical perforated hole into a cone-shaped end, and to a perforating device using the same, and more particularly, to a cross-section extension of a concrete structure, synthesis with other members, and slope reinforcement. , In order to insert a conical column bulb anchor formed to increase acupressure friction at the ends of bolts, nailings and dowel bars used for reinforcing tunnel rock, etc., drilling the hole end in a cylindrical shape similar to the bulb anchor standard. It relates to a cone-shaped drilling undercut device and a drilling device using the same.

In general, anchors such as bolts, nailings, and dowel bars are installed for cross-sectional extension of concrete structures, synthesis with other members, slope reinforcement, and tunnel rock reinforcement. The anchor installation is fixed by inserting and mounting the anchor into a cylindrical perforation hole formed using a cylindrical drill having a predetermined diameter at the position and injecting grouting.

However, in the prior art, since the anchor cross-section is constant and the perforated hole is also a cylindrical shape, when the pulling force is applied after the anchor is mounted, the anchor is easily activated due to lack of friction, leading to an accident, or to control the phenomenon. And due to the increase in the anchor length and the number of reinforcing anchors, there is a problem that economical efficiency, constructability, and environmental efficiency are weakened.

In order to solve this problem, Korean Patent Publication No. 10-0991826 "Perforated Drill Bit" allows the drill blade to rotate while inclined at a certain angle so that the end of the perforated hole is partially expanded.

However, in the case of Korean Patent Publication No. 10-0991826, it is possible to expand the end of the perforated hole close to the surface, but if the perforated hole diameter is small or the depth of the perforated hole is deep, the angle at which the drill blade can be tilted is limited. Due to the non-uniformity, it is difficult to expand the end of the perforated hole according to the standard of the bulb anchor, and there is a problem that the construction period is greatly increased due to the lack of resistance performance against pulling and the decrease in constructability.

In addition, in Korean Patent Publication No. 10-0609329, "Drill for forming an anchor bolt insertion hole", a conical bulb anchor can be mounted by protruding the end of the drill blade and rotating it with an eccentric shaft at the top so that the end of the hole is expanded. Made it possible.

However, in the case of Korean Patent Publication No. 10-0609329, since the drill blade rotates about the eccentric axis, a drill blade smaller than the diameter of the drilled hole moves the inner surface of the drilled hole and drills to form a conical end. Not only does this take, there is a problem that it is difficult to accurately form the conical end.

In addition, in the conventional drilling device technology for expanding the end of the drilling hole, there is a problem in that quality and the like are deteriorated due to construction outside the design management value because there is no guide jig device for the exact standard and direction.

The problem to be solved by the present invention is to increase acupressure friction at the ends of bolts, nail rings and dowel bars used for cross-sectional extension of a concrete structure, synthesis with other members, slope reinforcement, tunnel rock reinforcement, etc. In order to insert the cone-shaped bulb anchor to be formed, it is intended to provide a cone-shaped perforated undercut device for drilling an end of a perforated hole in a cylindrical shape similar to the bulb anchor standard, and a perforating tooth using the same.

Another problem of the present invention is to provide a cone-shaped perforation undercut device and a perforation value using the same, which does not need to form an unnecessarily large perforated hole in order to form an undercut at the end of the perforated hole.

A cone-shaped perforation undercut device according to an embodiment of the present invention includes a drill guide 1100 in which an inner space is opened up and down and an open groove 1110 is formed in both sides in a longitudinal direction from a lower end to an outer surface spaced a predetermined distance; An inclined portion 1200 fixed to the lower portion of the drill guide 1100 and extending into the inner space to provide an inclined surface 1210 of the upper and lower light; It is elevated in the inner space of the drill guide 1100, the lower part is branched to both sides and moves along the inclined part 1200 surface, and the drill blade 1330 protruding laterally from the branched end moves along the open groove 1110. Including the drill part 1300, the drill part 1300 is a lifting shaft 1310 that is raised and lowered in the inner space of the drill guide 1100, branching on both sides at the lower end of the lifting shaft, and opening while spreading along the inclined part 1200 Characterized in that it comprises an elastic branch portion 1320 moving along the groove 1110 and a drill blade 1330 protruding from the end of the elastic branch portion 1320 to the outside and moving along the open groove 1110 while drilling.

Preferably, the inclined portion 1200 is formed in a cylindrical shape and has an inclined groove 1220 having an inclined surface 1210 of upper and lower light in a direction from the upper center to the lower side.

Preferably, the inner space of the drill guide 1100 is a moving space 1110 having a diameter spaced apart from the outer surface of the drill unit 1300 by a predetermined distance from the top to the center, and a wide area from the location of the open groove 1110 to the bottom. Consisting of an expansion space 1130 having a diameter and an inclined space 1140 formed to be inclined to the end of the moving space 1110 and the front end of the expansion space 1130, a fastening pin 1170 at the top of the drill guide 1100 An upper fastening groove 1150 for fixing the drill part 1300 is formed, and a lower fastening groove 1160 for fixing the inclined part 1200 with a fastening pin 1180 is formed at the bottom, and the inclined part ( 1200) is formed with a through hole 1230 fixed to the lower fastening groove 1160 of the drill guide 1100 so that it can be fixed with a fastening pin, and the lifting shaft 1310 is formed in the upper part of the drill guide 1100. The guide hole 1340 is formed in the longitudinal direction so that it can be lifted while being fastened to the upper fastening groove 1150 of the drill guide 1100 with a fastening pin 1170 in the center, and a fastening pin on the rotating shaft of the motor at the top. It characterized in that the fastening groove (1350) is formed to be fastened.

A cone-shaped perforation undercut device according to another embodiment of the present invention includes a drill guide 2100 in which an inner space is opened up and down and an open groove 2110 is formed in a longitudinal direction on one side from a lower end to an outer surface spaced a predetermined distance; An inclined portion 2200 fixed to a lower portion of the drill guide 2100 and extending into the inner space to provide an inclined surface 2210 of the upper and lower light into the open groove 2110; The drill part 2300 moves along the surface of the inclined part 2200 as it rises and descends in the internal space of the drill guide 2100 and moves along the open groove 2110 from the end of the drill blade 2330 protruding laterally. ), but the drill unit 2300 includes an elevating shaft 2310 that is elevated in the inner space of the drill guide 2100, a movable shaft 2320 rotatably connected to the lower end of the elevating shaft 2310, and a movable shaft ( It characterized in that it comprises a drill blade (2330) which protrudes from the end of the 2320 to the outside while moving along the open groove (2110) to drill.

Preferably, an upper fastening groove 2150 for fastening the drill part 2300 with a fastening pin 2170 is formed at the top of the drill guide 2100, and an inclined part 2200 is formed at the bottom with a fastening pin 2180. A lower fastening groove 2160 for fixing is formed, and the inclined portion 2200 is formed in a cylindrical shape and has an inclined surface 2210 of the upper and lower light in the direction from one upper end to the other lower end at a position corresponding to the open groove 2110. An inclined groove 2220 is formed, and a through groove 2230 fixed so as to be fixed with a fastening pin 2180 in the lower fastening groove 2160 of the drill guide 2100 is formed in the lower part, and the elevating shaft 2310 Extends to the upper part of the drill guide 2100, and in the center, a guide hole 2340 is formed in the longitudinal direction so that it can be lifted while being fastened with a fastening pin 2170 to the upper fastening groove 2150 of the drill guide 2100. , At the upper end, it is characterized in that a fastening groove 2350 that is fastened with a fastening pin 2360 to the rotation shaft 3200 of the motor is formed.

The drilling unit using the cone-shaped perforation undercut device according to an embodiment of the present invention includes a body 3100 having a through hole formed in the lower part, and the drill parts 1300 and 2300 at the lower end while being located inside the body 3100. The rotation shaft 3200 to which the shaft 1310 is connected, the motor 3300 for rotating the rotation shaft 3200 connected to the upper end of the rotation shaft 3200, and the lifting shafts 1310 and 2310 of the drill parts 1300 and 2300 The upper fastening groove of the drill guide (1100, 2100) in the fastening groove (3220) of the elastic part (3400) and the rotation shaft (3200) located between the lower part of the rotary shaft (3200) and the upper part of the drill guide (1100, 2100) ( It includes a protective cover 3500 formed to surround the 1150, 2150. In this case, the motor 3300 may be located inside or outside the body 3100.

Preferably, the lower end of the rotary shaft 3200 is formed with an insertion groove 3210 so that the lifting shaft 1310 of the drill portions 1300 and 2300 located at the top end of the undercut drill is inserted, and the insertion groove has an elevation shaft 1310 It characterized in that the fastening groove 3220 to be fastened with the fastening pin 3230 is formed.

Preferably, the body 3100 is formed in the form of a cap at the bottom of the body 3100, the undercut drill is penetrated at the top, the bottom is supported around the perforation, and the drill cover 3600 through which dust generated from the perforated hole is introduced, and a drill cover ( A dust hose 3700 which has one end connected to the 3600 and the dust is moved, and the other end of the dust hose 3700 is connected, and a dust discharge part 3800 for discharging the first provided from the dust hose 3700 to the outside, It characterized in that it comprises a power transmission unit (3900) for transmitting power to operate the dust discharge unit (3800).

Preferably, the power transmission unit 3900 includes a driving bevel gear 3910 formed on the rotating shaft 3200 of the drilling device, a driven bevel gear 3920 engaged with the driving bevel gear 3910, and a driven bevel gear 3920 It characterized in that it comprises a rotary shaft 3930 connected to one end and the other end connected to the dust discharge unit 3800.

The cone-shaped perforation undercut device according to the present invention has the advantage of being able to obliquely expand the end of the perforated hole in the shape of a conical column of upper and lower light similar to the bulk anchor standard.

In addition, since only the end of the drilled hole is expanded into a cone shape by using a certain cylindrical drilled hole cross section as it is, the construction period is shortened while reducing the construction cost by reducing the depth of the drilled hole and expanding the cross section of the drilled hole unnecessary when inserting the existing bulb anchor structure. There is an advantage that can be made.

In addition, in the present invention, the drill guide rotates while the drill guide is in contact with the end of the perforated hole of a preferential straight line, so that it is perforated in the shape of a cone column bulb, thereby enabling accurate dimensional perforation and delta cone-shaped expansion.

In addition, the present invention can serve as a fixture when introducing prestress to the anchor body by forming a bulb shape at the end of the perforated hole by an undercut drill, thereby increasing load bearing capacity and earthquake resistance by introducing triaxial stress and restraining stress to adjacent facilities. It works.

In addition, in the present invention, the drill part is connected to the drill guide part in a pin manner, so that replacement is easy.

In addition, through the jig body of the present invention, it is possible to accurately puncture the puncturing direction and standard, so construction management is easy, and there is an effect of improving economic efficiency by preventing reconstruction due to a puncturing error.

1 is an exploded perspective view of a cone-shaped perforated undercut device according to an embodiment of the present invention.
Figure 2 is a perspective view of Figure 1;
3A to 3C are cross-sectional views illustrating a process of generating a cone-shaped undercut at an end of a hole by using the cone-shaped perforation undercut device according to an embodiment of the present invention of FIG. 1.
4 is an exploded perspective view of a cone-shaped perforated undercut device according to another embodiment of the present invention.
Figure 5 is a perspective view of Figure 4;
5A to 5B are cross-sectional views illustrating a process of generating a cone-shaped undercut at an end of a hole by using the cone-shaped perforation undercut device of FIG. 5 according to an embodiment of the present invention.
6 is a cross-sectional view of a drilling device using a cone-shaped drilling undercut device according to an embodiment of the present invention.
7 is a cross-sectional view of a drilling device using a cone-shaped drilling undercut device according to another embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, a cone-shaped perforation undercut device according to the present invention and a perforation tooth using the same will be described in detail.

As shown in Figures 1 to 3, the cone-shaped perforation undercut device according to an embodiment of the present invention, the inner space is opened up and down and open grooves in the longitudinal direction on both sides to the outer surface spaced a predetermined distance from the bottom ( A drill guide 1100 in which 1110 is formed; An inclined portion 1200 fixed to the lower portion of the drill guide 1100 and extending into the inner space to provide an inclined surface 1210 of the upper and lower light; It is elevated in the inner space of the drill guide 1100, the lower part is branched to both sides and moves along the inclined part 1200 surface, and the drill blade 1330 protruding laterally from the branched end moves along the open groove 1110. It includes a drill part (1300). At this time, the open groove 1110 in the drill guide 1100 is preferably formed to be 180 degrees symmetrical.

In the drill guide 1100, the inner space is opened up and down, and open grooves 1110 in the longitudinal direction are symmetrically formed on both sides of the lower outer surface to a position spaced apart from the lower end by a predetermined distance.

The inner space of the drill guide 1100 includes a moving space 1110 having a diameter spaced apart from the outer surface of the drill part 1300 from the top to the center part, and a wide diameter from the location of the open groove 1110 to the bottom. It consists of an expansion space 1130 and an inclined space 1140 formed to be inclined to an end of the moving space 1110 and a front end of the expansion space 1130. This moving space 1110 is formed with a diameter slightly larger than the outer surface of the drill part 1300 to precisely guide the lifting movement of the lifting shaft 1310 of the drill part 1300, and the expansion space 1130 and the slope The space 1140 can be prevented from touching the inner surface even if the elastic branch portion 1320 of the drill portion 1300 is opened along the inclined surface 1210 of the inclined portion 1200.

In addition, an upper fastening groove 1150 for fixing the drill part 1300 with a fastening pin 1170 is formed at the top of the drill guide 1100, and the inclined part 1200 is fixed with a fastening pin 1180 at the bottom. The lower fastening groove 1160 is formed for making it.

The inclined portion 1200 is fixed to the lower portion of the drill guide 1100 so that the elastic branch portion 1320 of the drill portion 1300 is opened while descending, and provides an inclined surface 1210 of the upper and lower light into the inner space. In this case, the inclined portion 1200 may be formed in a cylindrical shape and have an inclined groove 1220 having an inclined surface 1210 of the upper and lower light in a direction from the upper center to the lower side, or may be formed in a conical shape of the upper and lower light.

In addition, a through hole 1230 that is fixed to the lower fastening groove 1160 of the drill guide 1100 with a fastening pin is formed under the inclined portion 1200.

The drill unit 1300 is an elevating shaft 1310 that is elevated in the inner space of the drill guide 1100, an elasticity that is branched on both sides at the lower end of the elevating shaft and spreads along the inclined portion 1200 and moves along the open groove 1110 It includes a drill blade 1330 which protrudes outward from the end of the branch 1320 and the elastic branch 1320 and moves along the open groove 1110 to perforate.

In addition, the lifting shaft 1310 extends to the upper part of the drill guide 1100 and is guided in the longitudinal direction so that it can be lifted while being fastened with a fastening pin 1170 to the upper fastening groove 1150 of the drill guide 1100 in the center. A hole 1340 is formed, and a fastening groove 1350 that is fastened to the rotation shaft 3200 of the motor with a fastening pin 1360 is formed at the top.

When the rotation shaft of the motor is lowered in the state that the drill part 1300 is fastened to the rotation shaft of the motor, the lifting shaft 1310 also descends along the inner space of the drill guide 1100 and is located under the lifting shaft 1310. The elastic branch portion 1320 is also opened while descending along the inclined surface 1210 of the inclined portion 1200 so that the drill blade 1330 protrudes to the outside of the open groove 1110 of the drill guide 1100. In addition, when the rotation shaft 3200 of the motor rises, the lifting shaft 1310 of the drill part 1300 also rises along the inner space of the drill guide 1100, and the elastic branch part ( 1320 and the drill blade 1330 are also positioned so that the drill blade 1330 does not protrude from the drill guide 1100 while rising along the inclined surface 1210 of the inclined portion 1200.

In addition, when the drill blade 1330 rotates while descending along the inclined surface 1210 of the inclined portion 1200, the end of the perforated hole 1 may be obliquely expanded into the upper narrow beam of the cone-shaped column 2. That is, when the lifting shaft 1310 is rotated while the drill blade 1330 protrudes from the top of the open groove 1110 to the minimum, the diameter of the perforation may be expanded to the minimum, and the drill blade 1330 When the lifting shaft 1310 is rotated in a state protruding from the lower end of 1110 to the maximum, the diameter of the perforation is enlarged to the maximum so that it may be obliquely expanded to the upper and lower beams of the cone column shape 2.

On the other hand, as shown in Figures 4 and 5, the cone-shaped perforation undercut device according to another embodiment of the present invention, the inner space is opened up and down, and the outer surface spaced a predetermined distance from the bottom is opened in the longitudinal direction on one side A drill guide 2100 in which a groove 2110 is formed; An inclined portion 2200 fixed to a lower portion of the drill guide 2100 and extending into the inner space to provide an inclined surface 2210 of the upper and lower light into the open groove 2110; The drill part 2300 moves along the surface of the inclined part 2200 as it rises and descends in the internal space of the drill guide 2100 and moves along the open groove 2110 from the end of the drill blade 2330 protruding laterally. ).

In the drill guide 2100, an inner space is opened up and down, and an opening groove 2110 in the longitudinal direction is formed on one side of the lower outer surface to a position spaced apart from the lower end by a predetermined distance. The inner space of the drill guide 2100 is used as a moving space 2110 having a diameter spaced a predetermined distance from the outer surface of the drill part 2300 from the top to the center.

In addition, an upper fastening groove 2150 for fastening the drill part 2300 with a fastening pin 2170 is formed at the top of the drill guide 2100, and the inclined part 2200 is fixed with a fastening pin 2180 at the bottom. The lower fastening groove 2160 is formed for the purpose.

As the inclined part 2200 is fixed to the lower part of the drill guide 2100, the moving shaft 2320 of the drill part 2300 descends, and the drill blade 2330 is moved to the outside of the open groove 2110 of the drill guide 2100. An inclined surface 2210 of the upper and lower light is provided so as to protrude. In this case, the inclined portion 2200 may have a cylindrical shape and an inclined groove 2220 having an inclined surface 2210 of upper and lower light in a direction from an upper end to the lower end of the other side at a position corresponding to the open groove 2110. It is preferable that the height of the inclined portion 2200 is located at a position equal to or lower than the upper end of the open groove 2110.

In addition, a through hole 2230 fixed to be fixed with a fastening pin 2180 to a lower fastening groove 2160 of the drill guide 2100 is formed under the inclined portion 2200.

The drill part 2300 is at the end of the lifting shaft 2310 that is elevated in the inner space of the drill guide 2100, the moving shaft 2320 rotatably connected to the lower end of the lifting shaft 2310, and the moving shaft 2320. It includes a drill blade 2330 protruding to the outside and perforating while moving along the open groove 2110.

The elevating shaft 2310 extends to the top of the drill guide 2100, and in the center is a guide hole in the longitudinal direction so that it can be elevated while being fastened with a fastening pin 2170 to the upper fastening groove 2150 of the drill guide 2100. 2340 is formed, and a fastening groove 2350 that is fastened to the moving shaft 2320 of the motor with a fastening pin 2360 is formed at the top.

In this drill guide 2100, when the lifting shaft 2310 of the drill part 2300 descends, the lifting shaft 2310 also descends along the inner space of the drill guide 2100 and can be rotated below the lifting shaft 2310. The movable shaft 2320 fastened so that the drill blade 2330 protrudes outward from the open groove 2110 of the drill guide 2100 while descending along the inclined surface 2210 of the inclined portion 2200. And, when the lifting shaft 2310 of the drill part 2300 rises, the moving shaft 2320 rotatably fastened to the lifting shaft 2310 also rises along the inclined surface 2210 of the inclined part 2200, while the drill blade ( 2330 is positioned so that it does not protrude from the drill guide 2100.

In addition, when the drill blade 2330 is rotated while descending along the inclined surface 2210 of the inclined portion 2200, the end of the perforated hole 1 may be obliquely expanded to the upper narrow beam of the cone-shaped column 2. That is, when the lifting shaft 2310 is rotated with the drill blade 2330 protruding from the top of the open groove 2110 to the minimum, the diameter of the perforation can be expanded to the minimum, and the drill blade 2330 is When the lifting shaft 2310 is rotated in a state protruding from the lower end of 2110 to the maximum, the diameter of the perforation may be expanded to the maximum, and thus may be obliquely expanded to the upper narrow beam.

On the other hand, as shown in Figure 6, the drilling machine using the cone-shaped perforation undercut device according to an embodiment of the present invention, a body 3100 having a through groove to which an undercut drill can be mounted, and a body 3100 ), and a motor 3300 that rotates a rotation shaft 3200 connected to the upper end of the rotation shaft 3200 and a rotation shaft 3200 connected to the lifting shaft 1310 of the drill part 1300, 2300 at the bottom while being located inside , An elastic part 3400, an elastic part 3400, which is located between the lower part of the rotation shaft 3200 and the upper part of the drill guide 1100, 2100, surrounding the lifting shafts 1310 and 2310 of the drill part 1300, 2300. It includes a protective cover (3500) surrounding it. In this case, the motor 3300 may be located inside or outside the body 3100.

The lower end of the rotary shaft 3200 is formed with an insertion groove 3210 so that the lifting shaft 1310 of the drill parts 1300 and 2300 located at the top end of the undercut drill is inserted, and a fastening pin on the lifting shaft 1310 in the insertion groove A fastening groove 3220 that is fastened to the 3230 is formed.

It is preferable that the elastic part 3400 is made of an elastic spring. The elastic part 3400 prevents the rotating shaft 3200 connected to the motor 3300 and the lifting shafts 1310 and 2310 of the drill parts 1300 and 2300 from rapidly descending, thereby preventing the open groove of the drill guides 1100 and 2100 ( The length of the drill blades 1330 and 2330 protruding outside the 1110 and 2110 can be adjusted, and when the cone-shaped drilling is completed, the drill guides 1100 and 2100 can be quickly repositioned.

The protective cover 3500 is formed to surround the upper fastening grooves 1150 and 2150 of the drill guides 1100 and 2100 in the fastening grooves 3220 of the rotation shaft 3200, and fastening pins 1170 fastened to each fastening groove. 2170) to prevent separation. Accordingly, it is possible to fundamentally block the separation of the fastening pins 1170 and 2170 by the vibration of the motor 3300 by the protective cover 3500.

Looking at the operation process of the drilling device of the present invention, first, a cylindrical drilling hole 1 is formed in the cross section for work such as cross-section extension of a concrete structure, synthesis with other members, slope reinforcement, and tunnel rock reinforcement. In addition, after inserting the lifting shafts 1310 and 2310 of the undercut drill into the insertion groove 3210 formed at the bottom of the rotary shaft 3200 of the drilling device, it is fixed with a fastening pin 3230.

In addition, when the end of the drill guides 1100 and 2100 is positioned at the end of the perforation hole 1 and the motor 3300 is operated and pressurized downward, the drill part 1300 connected to the rotation shaft 3200 of the motor 3300, 2300) of the lifting shaft (1310, 2310), the elastic branch part 1320 connected to the bottom of the lifting shaft (1310, 2310) or the moving shaft (2320), the elastic branch part (1320) or the drill blade connected to the moving shaft (2320) As the (1330, 2330) also descends, it descends along the inclined surfaces (1210, 2100) of the inclined portions (1200, 2200). Accordingly, since the drill blades 1330 and 2330 are rotated while protruding to the outside of the open grooves 1110 and 2110 of the drill guides 1100 and 2100, the lower end of the perforated hole 1 is made to the upper end of the cone shape 2 It will expand obliquely to Hakwang. That is, when the drill blades 1330 and 2330 are rotated to protrude to the minimum from the top of the open grooves 1110 and 2110, the diameter of the perforation can be expanded to the minimum, and the drill blades 1330 and 2330 are opened grooves ( When rotated in a state protruding from the lower end of 1110 to the maximum, the diameter of the perforation is enlarged to the maximum, so that the end of the perforation hole 1 may be obliquely extended to the upper narrow beam of the cone-shaped column 2.

On the other hand, as shown in FIG. 7, the drilling machine using the cone-shaped perforation undercut device according to another embodiment of the present invention extends inward while surrounding the through hole at the bottom of the body 3100 and is generated in the perforated hole. The drill cover 3600 through which dust enters, the dust hose 3700 through which dust is moved by one end communicates with the drill cover 3600, and the other end of the dust hose 3700 are connected, and from the dust hose 3700 It includes a dust discharge unit 3800 for discharging the provided dust to the outside, and a power transmission unit 3900 for transmitting power so that the dust discharge unit 3800 is operated. It is preferable that the dust hose 3700 is made of a flexible hose, and the dust discharge part 3800 is formed with a blower.

The drill cover 3600 is formed in a cap shape so that an undercut drill is passed through the upper portion and the lower end is supported around the perforation. Therefore, dust generated by the undercut drill cannot be scattered to the outside, and thus is collected in the drill cover 3600.

The power transmission unit 3900 has a drive bevel gear 3910 formed on the rotation shaft 3200 of the drilling device, a driven bevel gear 3920 engaged with the driving bevel gear 3910, and a driven bevel gear 3920. It is connected and includes a rotating shaft 3930 to which the other end is connected to the dust discharge part 3800.

When the driving bevel gear 3910 is rotated in a state in which the driving bevel gear 3910 and the driven bevel gear 3920 are orthogonal to each other, the rotating shaft 3930 rotates together with the driven bevel gear 3920 Power is transmitted to the discharge unit 3800 so that the dust generated in the perforated hole can be discharged to the outside through the dust hose 3700 and the dust discharge unit 3800.

Those skilled in the art to which the present invention pertains will be able to understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting, and the scope of the present invention is indicated by the claims to be described later rather than the detailed description, and the meaning and scope of the claims and their equivalent concepts All changes or modified forms derived from it should be interpreted as being included in the scope of the present invention.

1100: drill guide 1110: open groove
1110: moving space 1130: extended space
1140: inclined space 1150: upper fastening groove
1160: lower fastening groove 1170: fastening pin
1180: fastening pin 1200: inclined part
1210: slope 1220: slope groove
1230: through hole 1300: drill part
1310: lifting shaft 1320: elastic branch
1330: drill blade 1340: guide hole
1350: fastening groove 1360: fastening pin
2100: drill guide 2110: open groove
2110: moving space 2150: upper fastening groove
2160: lower fastening groove 2170: fastening pin
2180: fastening pin 2200: inclined part
2210: slope 2220: slope groove
2230: through hole 2300: drill part
2310: lifting shaft 2320: moving shaft
2330: drill blade 2360: fastening pin
3100: body 3200: rotating shaft
3210: insertion groove 3220: fastening groove
3230: fastening pin 3300: motor
3400: elastic part 3500: protective cover
3600: drill cover 3700: dust hose
3800: dust discharge unit 3900: power transmission unit
3910: driving bevel gear 3920: driven bevel gear
3930: rotary shaft

Claims (8)

A drill guide 1100 in which the inner space is opened up and down and open grooves 1110 are formed in the longitudinal direction from the bottom to the outer surface spaced a predetermined distance from the bottom;
An inclined portion 1200 fixed to the lower portion of the drill guide 1100 and extending into the inner space to provide an inclined surface 1210 of the upper and lower light;
It is elevated in the inner space of the drill guide 1100, the lower part is branched to both sides and moves along the inclined part 1200 surface, and the drill blade 1330 protruding laterally from the branched end moves along the open groove 1110. Including a drill part (1300),
The drill unit 1300 is an elevating shaft 1310 that is elevated in the inner space of the drill guide 1100, an elasticity that is branched on both sides at the lower end of the elevating shaft and spreads along the inclined portion 1200 and moves along the open groove 1110 It includes a drill blade 1330 which protrudes outward from the end of the branch 1320 and the elastic branch 1320 to perforate while moving along the open groove 1110,
The inclined portion 1200 is formed in a cylindrical shape and has an inclined groove 1220 having an inclined surface 1210 of upper and lower light in the direction from the upper center to the lower side,
The inner space of the drill guide 1100 includes a moving space 1110 having a diameter spaced apart from the outer surface of the drill part 1300 from the top to the center part, and a wide diameter from the location of the open groove 1110 to the bottom. It consists of an expansion space 1130 and an inclined space 1140 formed to be inclined to the end of the moving space 1110 and the front end of the expansion space 1130,
The upper end of the drill guide 1100 is formed with an upper fastening groove 1150 for fixing the drill part 1300 with a fastening pin 1170, and a fastening pin 1180 for fixing the inclined part 1200 at the bottom. The lower fastening groove 1160 is formed,
A through groove 1230 fixed to be fixed with a fastening pin to the lower fastening groove 1160 of the drill guide 1100 is formed under the inclined portion 1200,
The lifting shaft 1310 extends to the upper part of the drill guide 1100, and is fastened to the upper fastening groove 1150 of the drill guide 1100 with a fastening pin 1170 in the center and a guide hole ( 1340) is formed, and the upper end of the cone-shaped perforation undercut device, characterized in that the fastening groove (1350) is formed to be fastened with a fastening pin to the rotation shaft of the motor. delete delete A drill guide 2100 in which an inner space is opened up and down and an opening groove 2110 is formed on one side of the outer surface spaced a predetermined distance from the lower end;
An inclined portion 2200 fixed to a lower portion of the drill guide 2100 and extending into the inner space to provide an inclined surface 2210 of the upper and lower light into the open groove 2110;
The drill part 2300 moves along the surface of the inclined part 2200 as it rises and descends in the internal space of the drill guide 2100 and moves along the open groove 2110 from the end of the drill blade 2330 protruding laterally. ), but
The drill part 2300 is at the end of the lifting shaft 2310 that is elevated in the inner space of the drill guide 2100, the moving shaft 2320 rotatably connected to the lower end of the lifting shaft 2310, and the moving shaft 2320. Cone-shaped perforation undercut device comprising a drill blade (2330) protruding to the outside and perforating while moving along the open groove (2110). The method of claim 4, wherein the upper end of the drill guide 2100 is formed with an upper fastening groove 2150 for fastening the drill part 2300 with a fastening pin 2170, and an inclined part 2200 with a fastening pin 2180 at the bottom. ) Is formed with a lower fastening groove 2160 for fixing,
The inclined portion 2200 is formed in a cylindrical shape and has an inclined groove 2220 having an inclined surface 2210 of an upper and lower light in a direction from one upper end to the other lower end at a position corresponding to the open groove 2110, and a drill guide A through hole 2230 fixed to be fixed with a fastening pin 2180 is formed in the lower fastening groove 2160 of the 2100,
The elevating shaft 2310 extends to the top of the drill guide 2100, and in the center is a guide hole in the longitudinal direction so that it can be elevated while being fastened with a fastening pin 2170 to the upper fastening groove 2150 of the drill guide 2100. 2340) is formed, the upper end of the cone-shaped perforation undercut device, characterized in that the fastening groove 2350, which is fastened with a fastening pin 2360 to the moving shaft 2320 of the motor is formed. A body 3100 having a through hole formed in the lower part, and a rotating shaft 3200 which is located inside the body 3100 and connected to the lifting shaft 1310 of the cone-shaped perforated undercut device of claim 1 or 5 at the lower end, The motor 3300 that rotates the rotation shaft 3200 connected to the upper end of the rotation shaft 3200, the lifting shafts 1310 and 2310 of the drill parts 1300 and 2300 are wrapped around the lower part of the rotation shaft 3200 and the drill guide 1100, A protective cover (3500) formed to surround the upper fastening grooves (1150, 2150) of the drill guides (1100, 2100) in the elastic part (3400) located between the upper part of the 2100, the fastening groove (3220) of the rotating shaft (3200) A drilling device using a cone-shaped drilling undercut device, characterized in that it comprises a. The method according to claim 6, wherein the lower end of the rotation shaft 3200 is an insertion groove 3210 is formed so that the lifting shaft 1310 of the drill portions 1300 and 2300 located at the top end of the undercut drill is inserted, and the insertion groove 3200 is formed with the lifting shaft ( A drilling device using a cone-shaped drilling undercut device, characterized in that the fastening groove 3220 to be fastened with the fastening pin 3230 is formed in 1310). The method according to claim 7, wherein the body (3100) is formed in a cap shape at the bottom of the body (3100), the undercut drill is penetrated at the top, the bottom is supported around the hole, and the drill cover (3600) through which dust generated from the hole is introduced, The dust hose 3700, which has one end connected to the cover 3600 to move the dust, and the other end of the dust hose 3700 are connected, and a dust discharge unit 3800 that discharges the first supplied from the dust hose 3700 to the outside. And, it includes a power transmission unit (3900) for transmitting power to operate the dust discharge unit (3800),
The power transmission unit 3900 has a drive bevel gear 3910 formed on the rotating shaft 3200 of the drilling device, a driven bevel gear 3920 engaged with the driving bevel gear 3910, and a driven bevel gear 3920. A drilling device using a cone-shaped drilling undercut device, characterized in that it comprises a rotary shaft 3930 connected to the dust discharge part 3800 and the other end connected to the dust discharge part 3800.

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