JPH0829445B2 - Upward expansion hole drilling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is directed to a hole wall in place of a predrilled drill hole,
The present invention relates to a shaving device for expanding a diameter of a drill and for expanding a diameter-increasing hole portion having an upward diameter.

(Prior Art) When an anchor bolt is planted in solidified concrete, in order to enhance the pull-out strength of the bolt, a device for cutting a diameter-expanded hole portion into a straight drill hole at an appropriate position, for example, Applicant has applied and has already published (Japanese Patent Laid-Open No. 60-19
1706 gazette), the cutting blade is moved along the overhanging jaw that gradually expands to the side downward, and the device main body is rotated while projecting to the outside of the overhanging jaw to expand the diameter expansion hole. There is a structure to cut down.

(Problems to be Solved by the Invention) According to the conventional cutting device described above, it is possible to cut a diameter-expanded hole portion in which the pull-out strength of the anchor bolt is enhanced as compared with a straight hole. The diameter of the anchor bolt gradually expands downward (opposite to the bolt withdrawal direction), so the anchor bolt is still joined to the wall of the expanded hole, but it is not engaged yet, so the bolt can be completely withdrawn. Could not be stopped.

The present invention has been made in view of the above-mentioned points, and it is possible to form a diameter-expanding hole portion that gradually increases in diameter upward, and an anchor bolt can be engaged with an engaging step at the upper end of the diameter-increasing hole portion, and the pull-out strength of the bolt The purpose of the present invention is to provide a shaving device for expanding holes that can be remarkably enhanced.

(Means for Solving the Problem) The gist of the present invention for achieving the above-mentioned object is that a cylinder body having a shank at the upper end and having an opening at the lower end rotates the upper part of the main body together, and is constant. A spring that urges the main body downward is inserted between the cylinder and the main body, and the base is semicircular with an isosceles triangular shape inside the accommodation hole opened at the front end of the main body. A pair of plate-shaped blades provided with cutting blades on the outer edges of the leading end are upwardly mounted, and the bases of both blades are axially attached so that they can be projected toward the side of the main body by opening the leading end in the phase separation direction. , A spring for pulling and urging the blade tip end portion into the accommodation hole is mounted between both blade bodies, and the lower end is brought into contact with the inner edge of both blade bodies in the shaft hole bored in the main body shaft core,
A stop in which an operating rod that causes the blade tip to protrude laterally from the spring against the spring is loosely inserted so as to be vertically movable within a certain range, and the upper end of the operating rod is loosely inserted into the outer periphery of the main body under the cylindrical tubular body. A J hole which is connected to the sleeve via a pin and which communicates with a longitudinal groove formed on the outer peripheral surface of the main body from the upper end of the stop sleeve is formed, and a large number of spherical bodies are inserted into the J hole and the longitudinal groove so as to be connected to each other. The upward expanding diameter hole shaving device is characterized in that a pushing member, which is partially fitted into the J hole and abuts against the uppermost spherical body, is provided at the lower end of the cylindrical body so as to project downward.

(Operation) According to the shaving apparatus of the present invention, the shank is connected to the rotary vibration type or rotary hammer type punching device,
By inserting the main body into the straight hole pre-drilled in the concrete and performing the piercing work in the state where the lower end of the stop sleeve is in contact with the concrete surface, the main body with the pair of blades pivoted is rotated while being pulled up, When the lower end of the operating rod held in place contacts the inner edge of the blade body due to the pulling movement of the main body, the tips of both blade bodies are projected to the side of the body, and the cutting blade portion of the blade tip portion is used. A diameter-expanded hole portion whose diameter is gradually increased upward is cut.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a central longitudinal sectional view of an abrading device of the present invention at the time of starting work, FIG. 2 is a central longitudinal sectional view of the same when a cylindrical body is pushed down at the end of an operation, and FIG. 3 is an ablation of the present invention. It is a perspective view of each component in a state where the device is disassembled.

In these figures, 1 is a cylindrical body having a shank 2 at the upper end and an opening at the lower end, and 3 is an apparatus main body in which the upper part is vertically slidably inserted into the cylindrical body 1, and the upper end of the main body 3 is laterally penetrated. A vertically elongated insertion hole 4 is formed, and the main body 3 rotates together with the cylindrical body 1 through a pin 5 penetrating the insertion hole 4 and loosely inserted so as to be vertically movable and vertically movable within a certain range. It is worn. Further, a spring 6 is interposed between the main body 3 and the cylindrical body 1 to urge the main body 3 downward.

A blade accommodating hole 7 is formed at the lower end of the main body 3 so as to penetrate laterally. Further, a shaft hole 8 that communicates with the housing hole 7 from the intermediate portion is formed in the shaft core portion of the main body 3.

Reference numeral 9 denotes a pair of plate-shaped blades having a semicircular base portion and an isosceles triangular tip portion. Both blade bodies 9 are directed upward and the base portion is rotatably attached to a lower end portion of the accommodation hole 7 by a pin 10. The blades 9 are attached to each other so that the tips of both blades 9 are opened in the direction of phase separation so that they project from the upper end of the accommodation hole 7 to the outside of the main body 3, respectively. It is provided.

Reference numeral 11 denotes a spring interposed between the two blade bodies 9 in a direction to close the front end portions of the double blade bodies 9, in other words, the front end portions of the double blade bodies 9 to the accommodation holes 7.
It is urged in the direction to pull it in.

Reference numeral 12 is a stop sleeve vertically slidably fitted around the outer periphery of the main body 3 below the cylindrical body 1, and 13 is an operation rod vertically slidably inserted into the shaft hole 8 of the main body 3, and the upper end portion of the operation rod 13 is provided. To
It is integrally connected to the lower end of the stop sleeve 12 by a pin 15 which is vertically inserted freely through a vertically long insertion hole 14 which is communicated with the upper end of the shaft hole 8 and laterally penetrates the body 3. The lower end of the operating rod 13 is brought into contact with the inner edges of both blades 9.

Reference numeral 16 denotes a plurality of pushing members projecting downward at equal intervals in the circumferential direction at the lower end of the cylindrical body 1. Corresponding to each pushing member 16, the stop sleeve 12 is made to communicate with the inner surface from the upper end and has a J hole.
17 are drilled. Then, longitudinal grooves 18 are formed on the outer periphery of the main body 3 so as to correspond to the inner surface side openings of the J holes 17, respectively.
A large number of spheres 19 are fitted in the J holes 17 and the longitudinal grooves 18 in a continuous manner, and the lower portion of the pushing member 16 is fitted into the J holes 17 to abut the uppermost sphere 19. .

Therefore, by pushing the cylindrical body 1 toward the sleeve 12 while holding the stop sleeve 12 in place,
The lower part of the pushing member 16 is deeply fitted into the J hole 17, the sphere 19 moves to the longitudinal groove 18 side of the main body 3, and the main body 3 is pushed upward against the spring 6. At this time, since the operating rod 13 is held in a fixed position together with the stop sleeve 12, both blade bodies 9 whose inner edges are in contact with the lower ends of the operating rods 13 have springs 11.
The blade 9 is pushed open against, and the tip of the blade 9 projects from the accommodation hole 7 to the side of the main body 3.

When the pushing down force of the cylindrical body 1 is removed, the cylindrical body 1 is pushed up by the urging force of the spring 6 and the main body 3
As the lower end of the operating rod 13 remains in contact with the inner edges of the blades 9, the pivot pin 10 moves away from the operating rod 13 and the tip of the blade 9 moves inward by the urging force of the spring 11. And is drawn into the accommodation hole 17.

 Next, the manner of use of the above embodiment will be described.

As shown in FIG. 1, the shank 2 is attached to a rotary vibration type punching device (not shown), the front end side of the main body 3 is inserted into a straight hole A previously drilled in concrete, and the lower surface of the stop sleeve 12 is placed on the concrete surface B. When the punching device is driven in a state of being brought into contact with and being held in a fixed position, the cylindrical body 1 rotates while being accompanied by vertical microvibration. This rotation causes the body 3
From the inside of the accommodation hole 7 at the lower end, the tips of both blades 9 are
Since it rotates while moving in and out laterally, the hole wall at the inner part of the straight hole A is gradually cut with a diameter-expanding hole portion having an upward diameter. In this manner, the upward diameter-expanding hole portion C is finally cut as shown in FIG. In order to simplify the description, the shank 2 side of the device is the upper end and the blade body 9 side is the lower end. However, the drilling work of the enlarged diameter hole portion by this shaving device is not limited to the downward straight hole, The same applies to straight holes facing upward or sideways.

(Effects) As described above, since the diameter-expanded hole part shaving apparatus of the present invention has the above-described configuration, the following effects are achieved.

The expanded diameter hole portion that is abraded by the abrading device of the present invention,
Since the hole that expands upward, in other words, in the pulling direction of the anchor bolt is cut, a kind of engagement step is formed between the upper end of the expanded hole portion and the straight hole wall, so concrete that is solidified, etc. In contrast to implanting the anchor bolt in the conventional downwardly expanded hole portion by using the anchor bolt having the engaging portion with the engaging step, The pull-out strength is greatly enhanced, and the anchor bolts can be reliably and firmly planted even when the property of the object to be drilled is weaker than that of concrete.

A holding rod that has a pair of plate-shaped blades that open to separate from each other and project to the side of the main body, and that is held in a fixed position in a shaft hole formed in the shaft center of the main body. Since the inner edges of both blades are brought into contact with the lower end and the tips of both blades are evenly projected to the side of the pressing body by the pulling movement of the main body, the expanded diameter hole is cut, so The two blades share the drilling load at the time of rotation, providing good rotation balance and enabling high-speed rotation.
The drilling work can be performed efficiently.

[Brief description of drawings]

FIG. 1 is a central vertical cross-sectional view of a cutting device according to an embodiment of the present invention at the start of work, FIG. 2 is a dynamic central vertical cross-sectional view of a state in which a cylindrical body is pushed down at the end of work, and FIG. It is a perspective view of each component in the state where the shaving apparatus of the invention was disassembled. 1 ... Cylindrical body, 2 ... Shank, 3 ... Device body, 4,14
...... Insertion hole, 5,10,15 ...... Pin, 6,11 ...... Spring, 7 ......
Housing hole, 8 ... Shaft hole, 9 ... Blade body, 9a ... Cutting blade, 12 ...
Stop sleeve, 13 …… Operating rod, 16 …… Pushing member, 17
…… J hole, 18 …… longitudinal groove, 19 …… sphere.

Claims (1)

[Claims] 1. A cylindrical body having a shank at the upper end and a lower end opened, the upper part of the main body rotating together and vertically movable within a certain range to urge the main body downward. It is inserted between the main body and the inside of the housing hole opened at the tip of the main body,
A pair of plate-shaped blades with a semicircular base and a cutting edge on the outer edge of the tip that forms an isosceles triangle are directed upward, and the tips are opened in the phase separation direction and project toward the side of the main body. While mounting the base of both blades as much as possible, install a spring between the two blades that draws the blade tip into the accommodation hole and urges it, and insert the inside of both blades into the shaft hole drilled in the shaft core of the main body. The lower end of the operating body is brought into contact with the lower end and the tip of the blade body is projected to the side of the main body against the spring. A stop sleeve loosely inserted into the outer circumference of the main body is connected through a pin, and a J hole communicating from the upper end of the stop sleeve to a longitudinal groove formed in the outer peripheral surface of the main body is formed. A large number of spherical bodies are formed in the J hole and the longitudinal groove. Is inserted in a concatenated manner, and a part of it is inserted into the J hole at the lower end of the cylindrical body and brought into contact with the uppermost sphere. Up the expanded diameter hole KezuNaru apparatus characterized by projecting from the timber downward.