JP2009148872A - Expanded-diameter hole boring auxiliary tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool which is for use in boring an expanded-diameter hole around an existing hole formed in a wall surface, a top board, or the like of a building made of mortar, wood, or the like, and facilitates the boring of the expanded-diameter hole irrespective of the diameter and shape of the circumference of the existing hole. <P>SOLUTION: An expanded-diameter boring device by a core drill has a conical cup detachably attached to a core body thereof, and the protrusion degree of the conical cup is adjusted at a location of a cutting blade of the core body so as to match with an existing hole diameter. Therefore when expanded-diameter hole boring work is carried out, by matching the conical cup with the existing hole and fitting the former into the latter, the entire body of the core drill does not fall in an unstable state, and the expanded-diameter hole boring work is facilitated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an apparatus for drilling in an enlarged diameter hole of an existing hole opening such as a wall surface in a building such as mortar, wooden, and ALC.

  Conventionally, it has been common to use a core drill in drilling work for purposes such as air conditioning and water supply.

  However, when the diameter dimension once drilled or the diameter of the existing hole is small, the center portion cannot be held in the drilling work using a center drill such as a core drill, resulting in difficulty. . Therefore, it is a work that is troublesome because it is performed manually by using other things such as turning or pulling.

Therefore, the following things are known by public relations to solve these problems.
Conventionally, an attachment / detachment device that has a shank attached to the drive shaft side of the drill device at one end and can attach the base end of the core drill and the base end of the center drill to the other end in a detachable manner concentrically. The center drill has an enlarged diameter drilling device having attachment portions at both ends having the same configuration as the attachment portion formed at the proximal end of the center drill that can be attached to and detached from the attachment portion of the attachment / detachment device. The attachment part at one end of the shaft is attached to the attachment part of the attachment / detachment device, and another attachment / detachment device having the same configuration is attached to the attachment part at the other end of the center shaft. An apparatus is provided for mounting a core drill having an outer shape equal to an existing hole in the apparatus. (For example, Patent Document 1)
Moreover, the apparatus which provided the attaching part fitted by the existing hole part in the auxiliary tool peripheral surface in diameter expansion hole work, and provided the holding | maintenance part which hold | maintains the center drill of a core drill, or a center pin in the auxiliary tool upper surface. Is provided. (For example, Patent Document 2)

  JP 2007-38351 PR   Japanese Laid-Open Patent Publication No. 2001-9619

However, the conventional enlarged-diameter device has the following problems.
In Patent Document 1, since a core drill having the same diameter as the existing hole diameter is required, various core drills are required, which is actually inconvenient.
In patent document 1 and patent document 2, if the existing hole is not circular, it is difficult to use.
In Patent Document 2, it is difficult to use an existing hole in a state where the position of the existing hole is a hole on the front slope or a ceiling surface.

  Therefore, in view of the above problems, the present invention provides various circular, elliptical, and irregular-diameter diameters when drilling existing holes such as air conditioners, waterworks, and gases in buildings such as mortar wooden structures and ALC. Even if it is a hole, the apparatus which hold | maintains the center drill of a core drill is easily fitted, and an efficient diameter expansion hole operation | work is provided.

In order to achieve the above-mentioned object, the present invention is a device that can be detachably mounted in the core body of a core drill in a device for fitting into existing holes such as wall surfaces and ceiling surfaces in buildings such as mortar wooden structures and ALCs to make the diameter expanded. In this auxiliary tool, the outer dimension of the lower part of the conical cup is made equal to or smaller than the inner diameter dimension of the core body, and a hole into which the center drill can be inserted is provided at the tip which is the apex of the conical cup.
Attach the push spring from the inside of the tip hole, glue the telescopic pipe assembly to the rear of the push spring, and adjust the length of the telescopic pipe assembly to adjust the conical cup around the core cutting blade position, In addition, it is characterized in that the diameter of the core drill can be efficiently increased by the elasticity of the push spring.

  In the expansion and contraction pipe assembly, a male thread groove is formed on one pipe, and a female thread groove is formed on the other pipe. The length of the full length can be easily adjusted by rotating one of the grooved telescopic pipe assemblies in the forward and reverse directions.

  Further, a rotating pipe holder is attached to the rear part of the telescopic pipe assembly. When the rotary pipe receiving telescopic pipe assembly is inserted into the center drill, the sliding tool comes into contact with the inner bottom portion of the core body. Therefore, even when the core body is rotated, the diameter-expanding hole operation can be efficiently drilled by preventing the conical cup from rotating.

  In addition, by providing a magnet on the bottom surface of the rotating pipe at the rear of the expansion / contraction pipe assembly, when the diameter expansion hole assisting tool is inserted into the center drill, the magnet is attracted to the bottom of the core body and the diameter expansion hole assisting tool is removed. It is characterized by improving work efficiency by providing it so as to prevent it.

  Since it is configured as described above, the following effects can be obtained.

  According to the first aspect of the present invention, it is easy to fit the apparatus even in the operation of making the hole having a diameter larger than the diameter of the existing hole by the apparatus of the present invention, and also in the deformed hole where the existing hole is not round If possible, it can be drilled with an enlarged diameter by a core drill or the like. It is economical because it can be produced at low cost.

  According to the second aspect of the present invention, in order to match the diameter of the existing hole, the position of the conical cup can be easily adjusted by turning one of the telescopic pipes forward and backward.

  According to the third aspect of the present invention, the conical cup of the diameter expansion hole assisting tool is fitted into the existing hole in the diameter expansion hole operation. Can be drilled.

  According to the fourth aspect of the present invention, the diameter-enlarged hole assisting tool attached to the core body does not fall off even in various states. Moreover, it is easy to match | combine the diameter of the existing hole, and the diameter of the cross section of a conical cup by integrating with the structure of Claim 2, 3. Therefore, the work efficiency is very good.

  Embodiments of the present invention will be described with reference to the drawings.

  An embodiment of an enlarged diameter hole assisting tool associated with drilling of an enlarged diameter of a core drill according to the present invention will be described with reference to the drawings.

  1 to 4 are views of a first embodiment of the present invention. FIG. 1 is a side view showing a state in which a diameter expansion hole assisting tool and a core drill are arranged in parallel. FIG. 2 is a bottom view seen from the rear of the conical cup. FIG. 3 is a perspective view of a state in which a conical cup is fitted into an existing hole in the wall surface. FIG. 4 is a side view in which a diameter increasing hole assisting tool is mounted on the core drill, and a conical cup is fitted into an existing hole on the wall surface.

Reference numeral 1 in the drawing in the first embodiment denotes a conical cup which is a tip portion of a diameter expansion hole auxiliary tool fitted into the existing hole 24. A hole is provided at the tip portion of the conical cup 1, and a tip is provided at the tip portion hole. A support pipe 5 is provided. The hole diameter of the tip support pipe 5 is a diameter that allows the center drill 11 of the core drill 9 to be inserted.
A scale print 6 is provided in a stepwise manner on the conical cup 1, and the scale print 6 represents a stepwise diameter of the conical cup 1.

  Reference numeral 2 denotes a push spring, which is joined to the tip support pipe 5, and the expandable pipe assembly 3 is bonded to the rear part of the push spring 2. The stretchable pipe assembly 3 is formed so as to be stretchable by combining the pipe A and the pipe B. Further, the fixing screw 8 is provided on the pipe A, and the fixing screw 8 is tightened to fix the pipe B. The rear part of the pipe B is a center drill through-hole 4, and a center drill 11 is inserted through the center drill through-hole 4 to set an expanded-diameter hole assisting tool on the core drill 9.

Therefore, the core drill 9 having a diameter larger than the diameter of the existing hole 13 is used as shown in FIG. Therefore, as shown in FIG. 1, the core body 10 of the core drill 9 and the diameter expansion hole assisting tool are placed in parallel so that the diameter of the cross section of the conical cup 1 is referred to, and the diameter of the existing hole 24 is determined with reference to the scale print 6. The length is adjusted by the pipe A and the pipe B of the telescopic pipe assembly 3 in order to match the position of the cutting blade 12 of the core body 10 so as to make the diameter slightly larger.
At this time, the total length from the diameter of the cross-section of the diameter expansion hole assisting tool is the length from the contact of the center drill through hole 4 of the pipe B to the bottom surface in the core body 10 to the cutting blade 12, and this length is In order to maintain, it is fixed with fixing screws 8.
In this state, as shown in FIGS. 1 and 4, when the center drill 11 of the core drill 9 is inserted through the center drill hole 4 of the pipe B of the telescopic pipe assembly 3, the center drill blade comes out from the tip support pipe 5, thereby expanding. The diameter hole assisting tool can be detachably mounted in the cup body of the core drill 9.
When attached to the electric drill in this mounted state, the conical cup 1 at the tip of the core drill 9 can be fitted into the existing hole 24 as shown in FIG. Even if it does, it does not become unstable, and the operation of drilling the enlarged diameter hole can be performed by the smooth rotation of the core body 10.

  In addition, if the diameter of the existing hole 24 which can be utilized is below the diameter of the conical cup lower part 7, it is possible continuously.

  FIGS. 5 and 6 show a second embodiment, and FIG. 5 is a side view in which a male screw groove and a female screw groove are respectively provided in the pipe A and the pipe B of the telescopic pipe assembly. FIG. 6 is a perspective view of FIG.

3A in the figure in the second embodiment is a pipe A provided with a female thread groove 14. 3B is a pipe B provided with a male screw groove 15. Therefore, the push spring 2, the conical cup 1, and the tip support pipe 5 are configured in the expansion and contraction pipe assembly 33 that is combined by turning the threaded pipe 3A and the threaded pipe 3B.
Reference numeral 13 denotes a fixing nut that fixes the pipe 3A and the pipe 3B in a combined state.

  Therefore, according to this configuration, the length of the expansion pipe assembly 33 is set so that the diameter of the cross section of the conical cup 1 is made slightly larger than the diameter of the existing hole 24 at the position of the cutting blade 12 in the diameter expansion hole operation as described in the first aspect. When adjusting, the length of the telescopic pipe assembly 33 is determined by turning the turning knob 16 of the pipe B3B, and the fixing nut 13 attached to the thread groove of the pipe B3B can be turned and fixed. Therefore, in this state, the drilling operation is performed by mounting the core drill 9.

  7 and 8 show a third embodiment. FIG. 7 is a perspective view of a main part in which a rotary pipe holder is attached to the center drill through hole 4 at the rear part of the telescopic pipe assemblies 3 and 33. FIG. 8 is a cross-sectional view of the main part in the core body of FIG.

  Reference numeral 17 in the drawing in the third embodiment is a rotary pipe receiver, and 18 is an outer ring of the rotary pipe receiver 17. Reference numeral 19 denotes an outer ring ball groove inside the outer ring 18, and 22 is attached to the pipe B with a pipe rod. A pipe gutter groove 21 is provided at the same position as the outer ring ball groove 19, and a ball 20 is inserted between the outer ring pipe groove and the pipe gutter groove to facilitate rotation of the outer ring 17 and the pipe gutter 21.

Therefore, by this configuration, as described in the previous section in the diameter expansion hole operation of the existing hole 24, the diameter of the cross section of the conical cup 7 is matched with the diameter of the existing hole 24, and the center of the rotary pipe receiver 17 of the diameter expansion hole assisting tool. The center drill 11 of the core drill 9 is inserted and attached to the drill through hole 4 and attached to the electric drill. In this state, the conical cup 1 is fitted into the existing hole 24.
In this state, the rotary pipe receiver 17 comes into contact with the bottom surface in the core body 10 by pressing the electric drill toward the core drill 9. Therefore, when the core drill 9 is rotated when the power drill is turned on, the contacted outer ring rotates, but the pipe rod 21 is not rotated by the ball 20 or the rotation is minimized. The conical cup 1 is capable of smoothly drilling a diameter-expanding hole.

  FIG. 9 shows a fourth embodiment. FIG. 9 is a perspective view of a main part in a state where a magnet is attached to the bottom of the rotary pipe receiver 17.

  23 in the figure in the fourth embodiment is a circular magnet attached to the bottom of the rotary pipe holder.

  Therefore, with this structure, when the conical cup 1 with the magnet 23 attached to the rotary pipe holder 17 is attached to the core drill, the magnet 23 attached to the rotary pipe holder 17 is attracted to the metal body at the bottom surface in the core body 10, Since the diameter expansion hole auxiliary tool does not fall off from the core drill 9, the diameter expansion hole work can be easily performed.

  From the above, it is possible to efficiently cope with various conditions in the drilling operation of the enlarged hole from the existing hole 24, and it is a more economical product.

  It is the top view which made the diameter-expansion hole auxiliary tool and core drill which show the 1st Example of this invention parallel.   It is the bottom view seen from the rear part of the conical cup of this invention.   It is the perspective view which fitted the conical cup of the diameter expansion hole auxiliary tool in the existing hole.   It is the side view which fitted the core drill with the diameter expansion hole auxiliary tool, and fitted to the existing hole.   It is a side view of the expansion-contraction pipe assembly of the pipe with a thread groove which shows the 2nd Example of this invention.   FIG. 6 is a perspective view of FIG. 5.   It is a figure which shows the 3rd Example of this invention, and is the principal part perspective view attached to the rotating pipe receptacle in the expansion pipe assembly.   It is principal part sectional drawing which mounted | wore the rotary pipe receptacle with the core drill.   It is a figure which shows 4th Example of this invention, and is the principal part perspective view which provided the magnet in the bottom part of the rotary pipe holder.

Explanation of symbols

1 is a conical cup 2 is a push spring 3, 33 is a telescopic pipe assembly 3A is a threaded pipe A
3B is a threaded pipe B 4 is a center drill through hole 5 is a tip support pipe 6 is a scale print 7 is a conical cup lower part 8 is a fixing screw 9 is a core drill 10 is a core body 11 is a center drill 12 is a cutting blade 13 Fixing nut 14 is a female female thread groove 15 is a male male thread groove 16 is a turning knob 17 is a rotating pipe receiver 18 is an outer ring 19 is an outer ring ball groove 20 is a ball 21 is a pipe rod 22 is a pipe rod ball groove 23 is a magnet 24 is Existing hole 25 is wall surface

Claims (4)

An apparatus for expanding a hole by fitting into an existing hole such as a wall surface or a ceiling surface, and a conical cup that fits in the core body, and is a diameter expansion hole auxiliary tool that can be detachably mounted in the core body of the core drill. A hole having a diameter into which the center drill enters is provided at the tip which is the apex of the conical cup. A push spring is attached from the inside of the tip hole, and the expansion pipe assembly is bonded to the rear part of the push spring.
A diameter expanding hole assisting device provided so that the conical cup can be adjusted around the position of the core cutting blade by changing the length of the expansion pipe assembly.   In the expansion and contraction pipe assembly, a male thread groove is formed on one pipe and a female thread groove is formed on the other pipe and combined. 2. The diameter expansion hole assisting device according to claim 1, wherein one of the grooved expansion and contraction pipe assemblies is rotated in the forward and reverse directions so that the total length can be adjusted.   A rotating pipe holder is attached to the rear part of the telescopic pipe assembly. When the rotating pipe receiving telescopic pipe assembly is inserted into the center drill, the rotating pipe holder contacts the inner bottom portion of the core body. Therefore, the diameter expansion hole assisting device according to claim 1, wherein the core body is provided so as to prevent rotation of the conical cup even when the core body rotates.   By providing a magnet on the bottom surface of the rotating pipe at the rear of the telescopic pipe assembly, when the diameter expansion hole assisting tool is inserted into the center drill, the magnet is attracted to the bottom of the core body to prevent the diameter expansion hole assisting tool from falling off. The diameter-enlarged hole assisting device according to claim 1, 2, or 3.

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