JP3202194B2 - Core drill concrete drop prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core drill for drilling concrete with a cylindrical core bit, and more particularly to a concrete fall prevention device therefor.

[0002]

2. Description of the Related Art For example, a core drill is used for drilling concrete in piping or air-conditioning equipment of a concrete building. The core drill has a cylindrical core bit, and the core bit is connected to a drive shaft of the motor. Further, an industrial diamond edge is formed on the outer peripheral edge of the lower end of the core bit, and this is brought into contact with the upper surface of the concrete, and when the core bit is rotated by the motor, the concrete can be drilled by the core bit.

[0003] In this case, when drilling concrete with a cylindrical core bit, the drilled portion is accommodated in the core bit. For this reason, when drilling concrete on the floor of two or more floors, the drilled concrete may fall out of the core bit and fall on the floor of the lower floor, which is extremely dangerous. Have been.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems in a core drill for drilling concrete with a cylindrical core bit, and to prevent the drilled concrete from dropping when drilling concrete. It was done as.

[0005]

The invention according to this application is two inventions. According to a first invention, co down cleat anchor is embedded in the drilling center position of the concrete, is fixed, when the concrete by the core bit is drilled, the concrete anchor is disposed within the core bit. Further, a plurality of telescopic rods are supported on the upper wall of the core bit, and the telescopic rod extends into the core bit. Further, the lower end of the telescopic rod and the concrete anchor are connected by the connecting tool, and the telescopic rod is contracted by an appropriate mechanism as the concrete is drilled. Further, a bearing is provided on the coupling of the telescopic rod, and the rotation of the core bit causes the telescopic rod and the coupling to rotate around the concrete anchor. Therefore, after drilling the concrete, the concrete can be hung by the telescopic rod, the connecting tool, and the concrete anchor to prevent the concrete from falling.

According to the second aspect of the present invention, the connecting member is disposed at the center position of the concrete hole. The coupling is sleeve-shaped, has a flange, and is placed in the core bit when the concrete is drilled by the core bit. Furthermore, the concrete anchor penetrates the flange of the connecting tool, is embedded in the concrete in place, the connecting tool is fixed by the concrete anchor, and on the rotation center axis of the core bit, the suspension rod is supported by the upper wall of the core bit, and the suspension rod is Extends into the core bit and is inserted into the coupling. Furthermore, the tooth groove, the pawl and the spring constitute a retaining mechanism, the tooth groove is formed on the suspension rod, and the pawl is provided on the connecting member. And, when the pawl is elastically urged by the spring and the hanging rod is inserted into the connecting member, the pawl is engaged with the groove of the hanging rod, and the pawl and the groove prevent the hanging rod from moving in the reverse direction. The suspension rod does not fall out of the coupling. Therefore, after drilling the concrete, the concrete can be hung by the hanging rod, the connecting tool, and the concrete anchor, and the concrete can be prevented from dropping.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.

In FIG. 1, this is a core drill concrete drop prevention device, which is a reference example.
Is not an example. Prior to the description of the embodiment, first,
To explain the reference example, the core drill is a cylindrical core bit 1
And the core bit 1 is supported by the carriage 2 and is rotatably guided. Further, the motor 3 is attached to the carriage 2, and the core bit 1 is connected to a drive shaft of the motor 3. Therefore, the core bit 1 can be rotated by the motor 3.

The carriage 2 is attached to a guide rail 4 and is guided so as to be able to move up and down. Further, a handle 5 is provided on the carriage 2, a pinion is fixed to the handle 5, and the pinion is engaged with the rack 6 of the guide rail 4. Therefore, the pinion can be rotated by the handle 5, and the core bit 1, the motor 3 and the carriage 2 can be lowered or raised along the rack 6.
Further, an industrial diamond edge 7 is formed on the outer peripheral edge of the lower end of the core bit 1. When the core bit 1 is rotated by the motor 3 and the core bit 1 is pushed down by the handle 5, the industrial diamond edge 7 contacts the upper surface of the concrete. The concrete can be drilled by the core bit 1.

As shown in FIGS. 2 and 3, the apparatus has a concrete anchor 8. Concrete anchor 8
Are for embedding in the appropriate places of the concrete 9.
In this reference example, when the concrete anchor 8 is embedded and fixed at the center position of the drilling hole of the concrete 9 and the concrete 9 is drilled by the core bit 1, the concrete anchor 8 is arranged in the core bit 1. further,
A connecting means is disposed in the core bit 1, and the upper wall 10 of the core bit 1 and the concrete anchor 8 are connected by the connecting means.

[0011] In this reference example, reel 1 as the connecting means
1 and a wire 12 are used, and the reel 11 is provided on the upper wall 10 of the core bit 1 and is fixed. The position is a position radially away from the rotation center position of the core bit 1. The wire 12 is wound around the rotating body 13 of the reel 11 and extends inside the core bit 1.

Further, the lower end of the wire 12 and the concrete anchor 8 are connected by the connecting member 14. Connector 14
Is an eye fitting 15, a connecting sleeve 16 and a fixing fitting 17
The eye fitting 15 and the connecting sleeve 16 are connected to each other, and the wire 12 is passed through the through hole of the eye fitting 15 and connected thereto. Further, an internal thread is formed in the connection sleeve 16 and an external thread is formed in the fixing bracket 17, and after the concrete anchor 8 is embedded, the fixing bracket 17 and the concrete anchor 8 are connected by the bolt 18,
After fixing, the connecting sleeve 16 can be screwed to the fixing bracket 17 and fixed. Therefore, eye fitting 1
5. The lower end of the wire 12 and the concrete anchor 8 can be connected by the connecting sleeve 16 and the fixing bracket 17.

Further, in this device, a bearing 19 is provided on the connecting member 14. In this reference example, the bearing 19 is fitted into the inner peripheral surface of the connecting sleeve 16, the eye fitting 15 is inserted into the connecting sleeve 16, and the eye fitting 15 is connected to the connecting sleeve 16 by the bearing 19.
Are connected. The operation will be described later.

Further, a helical spring 20 is provided on the reel 11 of the wire 12 and is engaged with the rotating body 13 thereof. The rotating body 13 is elastically urged in the wire winding direction. And the rotating body 1
It is wound on 3. Spring 2 by handle 22
It is also possible to increase the elasticity by winding up 0. The guide sleeve 21 is for preventing the wire 12 from being unwound. In the casing 23, the guide sleeve 21 is elastically urged by a spring 24, which engages with a plurality of balls 25, and the balls 25 are pushed down along the tapered surface 26 of the casing 23. Therefore, even if a downward load is applied to the wire 12, the ball 25 is guided by the tapered surface 26, and the wire 12 is sandwiched between the balls 25.
2 is locked, and the wire 12 is
It is not rewound from or pulled out. Furthermore, in this connection, the operating sleeve 27 is supported by the casing 23,
When the operation sleeve 27 is pulled up by the handle 28, the ball 25 is pushed up by the operation sleeve 27, and the wire 12 is not locked. Therefore, the wire 12 is connected to the rotating body 1 of the reel 11.
3 can be rewound and pulled out.

In this core drill, concrete 9
To drill a hole, first, a concrete anchor 8 is embedded in the center of the hole in
The fixing bracket 17 and the concrete anchor 8 are connected by 8 and fixed. Next, when the operating sleeve 27 is pulled up by the handle 28 and the wire 12 is pulled by the eye fitting 15 and the connecting sleeve 16, the wire 12 can be rewound from the rotating body 13 of the reel 11 and pulled out. Therefore, the connection sleeve 16 can be screwed and fixed to the fixing bracket 17 of the concrete anchor 8, whereby the lower end of the wire 12 and the concrete anchor 8 can be connected. Thereafter, when the core bit 1 is rotated by the motor 3 and the core bit 1 is pressed down and lowered by the handle 5, the industrial diamond edge 7 is brought into contact with the upper surface of the concrete 9 and the concrete 9 can be drilled by the core bit 1.

Further, with the drilling of the concrete 9, the upper wall 10 of the core bit 1 descends and approaches the concrete 9, but in this device, the spring 2
0 acts on the rotating body 13 of the reel 11, and the rotating body 13 is elastically urged in the wire winding direction.
It is wound up. Thereby, the upper wall 10 of the core bit 1
Is absorbed. Further, the eye fitting 15 is guided by the bearing 19, and the wire 12 and the eye fitting 15 rotate around the concrete anchor 8 with the rotation of the core bit 1. Therefore, the wire 12 is not twisted, the core bit 1 can be rotated without hindrance, and the concrete 9 can be drilled, and there is no problem.

Therefore, when the concrete 9 is drilled, the wire 12, the eye fitting 15, the connecting sleeve 16,
The concrete 9 is suspended by the fixing bracket 17 and the concrete anchor 8 to prevent the concrete 9 from dropping. Therefore, when the concrete of the floor of the second floor or more is drilled, the drilled concrete 9 does not fall out of the core bit 1 and does not fall to the floor of the lower floor, which is safe.

FIG. 4 shows an embodiment of the present invention.
It is an example. In this embodiment, a plurality of telescopic rods 29, 30 are used as connecting means.
30 is supported on the upper wall 10 of the core bit 1 and extends into the core bit 1. The direction is vertical. Furthermore, in this embodiment, in the core bit 1, one telescopic rod 29 is disposed at the radial center position of the core bit 1, and three telescopic rods 30 are provided around the telescopic rod 29, and are spaced at angular intervals. It is arranged.

As shown in FIGS. 5 and 6, the telescopic rod 29 is of a three-stage type and comprises three rectangular rods. 3
The square rods are fitted together and can be slid axially to extend or contract. Further, a flange 31 is provided at the upper end thereof, and the upper wall 10 of the core bit 1 and the flange 31 are connected and fixed by bolts, whereby the telescopic rod 29 is supported. The telescopic rod 30 is also a three-stage type, and is composed of three screw rods. The three threaded rods are screwed together, and when relatively rotated, the telescopic rod 30 can be extended or contracted in the axial direction.
Further, a hexagon bolt head 32 is provided at its upper end,
In the upper wall 10 of the core bit 1, each telescopic rod 30 is inserted into a through hole in the upper wall 10, and the hexagon bolt head 32 engages with the upper surface of the upper wall 10, thereby supporting the telescopic rod 30.

Further, in this embodiment, the lower ends of the extensible rods 29, 30 and the concrete anchor 8 are connected by the connecting member 33. The connection tool 33 includes a connection arm 34, a connection boss 35, and a connection sleeve 36. Then, the lower end of the telescopic rod 29 is inserted into the connecting boss 35 and fixed. For the telescopic rod 30, the connecting arm 34
Are integrated with the connection boss 35, and the lower end of the connection rod 30 and the connection arm 34 are connected by the pin 37. Further, a flange 38 is formed on the connection boss 35 and the connection sleeve 36. After the concrete anchor 8 is embedded, the connection sleeve 36 and the concrete anchor 8 are connected by the bolt 39, and the bolt 40 and the flange 38 are formed.
Thus, the connection boss 35 and the connection sleeve 36 can be connected. Therefore, the connecting arm 34 and the connecting boss 3
5 and the connecting sleeve 36, the telescopic rods 29, 3
0 and the concrete anchor 8 can be connected.

In this device, a bearing 41 is provided on the connecting member 33. In this embodiment, a double sleeve is used as the connecting sleeve 36, the connecting sleeve 36 is composed of an outer sleeve and an inner sleeve, the bearing 41 is provided between the outer sleeve and the inner sleeve, and the outer sleeve is rotatable. You are being guided. A flange 38 is formed on the outer sleeve, and the connection boss 35 is connected to the outer sleeve of the connection sleeve 36.

Further, this device has a mechanism for contracting the telescopic rod 30. In this embodiment, an arm 42 is provided on the carriage 2, and a leaf spring 43 is attached to the tip of the carriage 2. As will be described later, the hex is formed by the leaf spring 43 at the upper end of the telescopic rod 30 as the core bit 1 rotates. The bolt head 32 is opened and the telescopic rod 30
Rotates, whereby the telescopic rod 30 contracts.

In the case of this device, after the concrete anchor 8 is embedded, the connecting sleeve 36 and the concrete anchor 8 are connected by the bolt 39, and then the hexagonal bolt head 32 is rotated by a tool to extend the telescopic rod 30. Accordingly, the telescopic rod 29 also extends, and the connecting boss 35 descends toward the connecting sleeve 36. Therefore, the connection boss 35 and the connection sleeve 36 can be connected by the bolt 40 and the flange 38. Then, the core bit 1 is pushed down by the handle 5 and lowered, and the industrial diamond edge 7 is brought into contact with the upper surface of the concrete 9. Further, the hex bolt head 32 is rotated in the reverse direction, whereby the telescopic rods 29 and 30 are contracted, and the hex bolt head 32 may be engaged with the upper surface of the upper wall 10 as shown in FIG. Then, the motor 3
When the core bit 1 is rotated by the handle 5 and the core bit 1 is pushed down by the handle 5 and lowered, the core bit 1
Thereby, the concrete 9 can be drilled.

Further, as the concrete 9 is drilled, the upper wall 10 of the core bit 1 descends and approaches the concrete 9.
With the rotation of, the hexagonal bolt head 32 is opened in each telescopic rod 30 by the leaf spring 43, and each telescopic rod 30 is sequentially rotated by a constant angle. Therefore, as shown in FIG. 8, each extensible rod 30 contracts by a fixed length in accordance with the drilling of the concrete 9. Accordingly, the telescopic rod 29 also contracts, thereby absorbing the descending amount of the upper wall 10 of the core bit 1. In addition, bearing 4
1 guides the connecting boss 35, and with the rotation of the core bit 1, the telescopic rods 29 and 30 and the connecting arm 34
And the connecting boss 35 rotates around the concrete anchor 8. Therefore, the core bit 1 can be rotated without hindrance and the concrete 9 can be drilled, and there is no problem.

Therefore, when the concrete 9 is drilled, the hexagonal bolt head 32 engages with the upper surface of the upper wall 10 of the core bit 1, and the telescopic rod 30, the connecting arm 34, the connecting boss 35, the connecting sleeve 36 and The concrete 9 is suspended by the concrete anchor 8 and its falling is prevented. Therefore, when the concrete of the floor of the second floor or more is drilled, the drilled concrete 9 does not fall out of the core bit 1 and does not fall to the floor of the lower floor, which is safe.

FIG. 9 shows another embodiment. In this embodiment, the connecting tool 44 is arranged at the center of the hole in the concrete 9. The connecting member 44 has a sleeve shape, and
5, when the concrete 9 is drilled by the core bit 1, the connector 44 is placed in the core bit 1. Further, a plurality of concrete anchors 8 are arranged at angular intervals around the connector 44, penetrate the flange 45 of the connector 44, are embedded in the concrete 9 in place, and are connected by the concrete anchor 8.
Is fixed. For example, as shown in FIG. 12, an annular projection 46 is provided on the connecting member 44 and a small hole 47 is formed in the concrete 9.
After that, the concrete anchor 8 penetrates the flange 45 of the connecting tool 44 and is embedded in the concrete 9 in a proper place, whereby the connecting tool 44 is fixed.

Further, a suspension rod 48 is supported on the upper wall 10 of the core bit 1 on the rotation center axis of the core bit 1. For example, a round rod having a circular cross section is used as the suspension rod 48, and the suspension rod 48 is attached and supported by bolts 49 on the upper wall 10 of the core bit 1.
And is inserted into the connector 44. Further, a retaining mechanism is constituted by the tooth groove 50, the pawl 51, and the spring 52. The tooth groove 50 is formed on the suspension rod 48, and the pawl 51 is provided on the connecting tool 44. And
When the pawl 51 is elastically urged by the spring 52 and the hanging rod 48 is inserted into the connecting member 44, the pawl 51
Engages with a tooth groove 50 of the suspension rod 48.

In the case of this device, the tooth grooves 50 are composed of a number of annular grooves, are provided on the outer peripheral surface of the suspension rod 48, and are formed at a constant pitch. As shown in FIGS. 10 and 11, a holder 53 and a cover 54 are built in the coupling tool 44, and the holder 51 and the cover 54 hold the pawl 51 and the spring 52. The holder 53 has a sleeve shape, is arranged concentrically with the connecting member 44, and has an outer peripheral surface formed of a tapered surface. Further, the holder 5
In the third tapered surface, a plurality of axial grooves 55 are formed at angular intervals, and each of the axial grooves 55 accommodates a pawl 51 and a spring 52, respectively.
The cover 54 is also sleeve-shaped, and its inner peripheral surface is formed of a tapered surface 56, which is fitted to the tapered surface of the holder 53. Therefore, the axial groove 55, the pawl 51, and the spring 52 are covered by the tapered surface 56. The axial groove 55 and the tapered surface 56 are inclined inward as going upward.

Further, on the upper side of the holder 53, an operating sleeve 57 is housed in the connecting member 44, and the pawl 51 is elastically urged by a spring 52, and the pawl 51 is engaged with the lower end of the operating sleeve 57, and Held in position. The operation sleeve 57 is also arranged concentrically with the connecting tool 44, and its inside diameter corresponds to the inside diameter of the holder 53. Further, in this embodiment, a protrusion 58 is formed on the pawl 51. The ridge 58 is for engaging with the tooth groove 50 of the suspension rod 48, is formed on the inner peripheral surface of the pawl 51, extends in the circumferential direction, and protrudes inward from the inner peripheral surface of the holder 53. .

Therefore, in this apparatus, when the core bit 1 is rotated by the motor 3, the core bit 1 is pushed down by the handle 5, and when the concrete 9 is drilled by the core bit 1, the suspension rod 48 rotates integrally with the core bit 1, As shown in FIG. 13, the suspension rod 48 passes through the operation sleeve 57 and is inserted into the holder 53 in the connector 44 as shown in FIG. 13. Therefore, the suspension rod 48 engages with the ridge 58 of the pawl 51, and the suspension rod 4
The pawl 51 is pushed down by 8, and the pawl 51 slides along the axial groove 55 and the tapered surface 56 and retreats from the suspension rod 48. This allows the suspension rod 48
Is allowed to move in the insertion direction. Then, the suspension rod 48
The tooth groove 50 is raised by the protrusion 5
8, the pawl 51 is pushed up by the spring 52, and the pawl 51 slides along the axial groove 55 and the tapered surface 56 and advances toward the suspension rod 48, and the ridge 58 of the suspension rod 48 The groove 50 is engaged. The tooth groove 50 is an annular groove of the suspension rod 48, and the pawl 51 is engaged with the tooth groove 50 of the suspension rod 48 regardless of the rotation of the suspension rod 48.

Thereafter, the pawl 51 is pushed down by the suspending rod 48 and retreats, and the pawl 51 is pushed up by the spring 52 and moved forward. Each time the pawl 51 descends, the pawls 51
0 is engaged. Thereafter, as shown in FIG. 14, the suspension rod 48 penetrates the connecting member 44 and the small hole 4 of the concrete 9 is formed.
7 to absorb the downward movement of the core bit 1 and the suspension rod 48.

Further, in the case of this device, the suspension rod 48
With the downward movement, the pawl 51 is pushed down by the suspending rod 48 and retreats, thereby allowing the suspending rod 48 to move in the insertion direction. Conversely, when a downward load is applied to the connecting tool 44, the pawl 51 51 is the hanging rod 48
Engages with the tooth groove 50. Further, with the downward load, the tapered surface 56 of the cover 54 acts on the claw 51, and the claw 51 is only pressed against the tooth groove 50 of the suspension rod 48, and does not retreat from the suspension rod 48. Therefore, the hanging rod 48 is formed by the pawl 51 and the tooth groove 50.
Is prevented from moving in the reverse direction, and the suspension rod 48
Do not fall out.

Therefore, when the concrete 9 is drilled, the concrete 9 is hung by the hanging rod 48, the connecting member 44 and the concrete anchor 8, and the concrete 9 is prevented from dropping. Therefore, when the concrete on the floor of the second floor or more is drilled, the drilled concrete 9 does not fall out of the core bit 1 and does not fall on the floor of the lower floor, which is safe.

Further, after the concrete 9 is drilled, when the pawl 51 is pushed down by the operation sleeve 57, the pawl 51 is pressed.
Slides along the axial groove 55 and the tapered surface 56, retracts from the suspension rod 48 and is disengaged from its tooth groove 50. Therefore, the suspension rod 48 can be pulled out from the connecting tool 44, and can be used for the next operation.

[0035]

As described in the foregoing, according to the present invention, when the concrete 9 is drilled, Shin contraction rod 3
0, the concrete 9 is suspended by the coupling 3 3,44 and concrete anchors 8, the drop can be prevented.
Therefore, when the concrete on the floors of the second floor or more is drilled, the drilled concrete 9 becomes the core bit 1
It is safe and can achieve its intended purpose without falling out of the interior and falling onto the floor below.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a reference example .

FIG. 2 is a perspective view of a reel, a wire, and a connector of FIG. 1;

FIG. 3 is a sectional view of a reel, a wire, and a connector of FIG. 1;

FIG. 4 is a perspective view showing an embodiment of the present invention .

FIG. 5 is a cross-sectional view of the telescopic rod and the connector of FIG.

FIG. 6 is an explanatory view showing a hole drilling step of the core drill of FIG. 4;

FIG. 7 is an explanatory view showing a step subsequent to FIG. 6;

FIG. 8 is an explanatory view showing a step subsequent to FIG. 7;

FIG. 9 is a perspective view showing another embodiment.

FIG. 10 is a cross-sectional view of the suspension rod and the connection tool of FIG. 9;

FIG. 11 is a perspective view of a holder, a pawl, and a spring of FIG. 10;

FIG. 12 is an explanatory view showing a hole drilling step of the core drill of FIG. 9;

FIG. 13 is an explanatory diagram showing a step subsequent to FIG.

FIG. 14 is an explanatory view showing a step subsequent to FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core bit 8 Concrete anchor 9 Concrete 10 Upper wall of core bit 11 Reel 12 Wire 13 Rotating body 14 Connector 19 Bearing 20 Spring 29, 30 Telescopic rod 33 Connector 41 Bearing 43 Leaf spring 44 Connector 45 Flange 48 Suspension rod 50 Tooth groove 51 pawl 52 spring

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B28D 1/14 B23B 51/04

Claims (2)

(57) [Claims] 1. A concrete drilling prevention device for a core drill for drilling concrete with a cylindrical core bit, wherein the concrete drilling device is embedded and fixed at the drilling center position of the concrete, and when the core bit drills the concrete, A concrete anchor disposed in the core bit; a plurality of telescopic rods supported by the upper wall of the core bit and extending into the core bit; a connecting member for connecting a lower end of the telescopic rod to the concrete anchor; A mechanism for contracting the telescopic rod with the hole, and a bearing provided on the connecting tool, for rotating the telescopic rod and the connecting tool around the concrete anchor with rotation of the core bit, the concrete After drilling, the telescopic rod, before A concrete fall prevention device for a core drill, wherein the concrete is suspended by the connecting tool and the concrete anchor to prevent the concrete from falling. 2. A concrete drop prevention device for a core drill for drilling concrete with a cylindrical core bit, comprising a flange, disposed at a center position of the concrete drilling hole, and when the concrete is drilled by the core bit. A sleeve-like connecting tool disposed in the core bit; a concrete anchor penetrating the flange and being embedded in an appropriate place in the concrete to fix the connecting tool; and a core bit on a rotation center axis of the core bit. A suspension rod that is supported by the upper wall of the suspension, extends into the core bit, and is inserted into the coupling tool; a tooth groove formed in the suspension rod; a claw provided on the coupling tool; A spring that biases the pawl forward when the suspension rod is inserted into the coupling. Engaged with the tooth space, it prevents backward movement of the suspending rod by said pawl and tooth space,
And a mechanism for preventing the hanging rod from falling out of the connecting tool. After drilling the concrete, the concrete is hung by the hanging rod, the connecting tool and the concrete anchor to prevent the concrete from dropping. A concrete fall prevention device for a core drill.