JPH0760520A - Boring device - Google Patents

Abstract

PURPOSE:To improve the efficiency of boring work by improving a boring tool to be speedily movable to a close position to a work preliminarily. CONSTITUTION:Prior to starting boring, a drive shaft 14 is moved down to a specified position to a transmission sleeve 3, and then it is integrally coupled with the transmission sleeve 3. A boring tool 13 carried at a forward end part of the drive shaft 14 is thus capable of reaching a close position to a work preliminarily. By driving the transmission sleeve 3 to rotate it and move it down simultaneously, therefore, the boring tool 13 which is integrated with the transmission sleeve 3 is engaged with the work immediately through the driving shaft 14 to start the boring work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling device for drilling a workpiece, in particular a peripheral wall of a fluid pipe.

[0002]

2. Description of the Related Art As shown in FIG. 5, a conventional punching device of this type is provided with a drive shaft 02 which carries a drilling tool 01 at its tip, and the drive shaft 02 is a casing 03.
It is mounted in and is axially movable and rotatable by hand or by an electric motor. When the fluid pipe 04 is drilled using this drilling device by the uninterrupted water method, the drilling device preliminarily sets the upper and lower saddles 0 on the fluid pipe 04 side.
5, 06 is connected to the connection opening 08 of the valve casing 07 which is fixed.

[0003]

However, since the punching tool 01 of the punching device is usually held in a position completely accommodated in the casing 03 in order to avoid collision with the outside, the punching device is connected. The distance L between the drilling tool 01 and the outer wall of the fluid pipe 04 immediately after connecting to the opening 08 is considerably long due to the height of the valve casing 07 and the upper saddle 05.

Therefore, when the boring operation is started, the boring tool 01 must inevitably be moved by this long distance L in the axial direction. However, the drilling tool 0
Since 1 is moved in the axial direction only by the feed mechanism for drilling, its moving speed is inevitably set to a low speed, and therefore a slow feeding process of the drilling tool 01 is started by the start of drilling. We had to carry out endlessly.

The present invention has been made in view of these problems, and it is an object of the present invention to improve the drilling tool so that the drilling tool can be moved quickly to the vicinity of the workpiece in advance to improve the efficiency of the drilling work. Has an aim.

[0006]

In order to achieve the above object, the present invention is a drilling device provided with a drive shaft for carrying a drilling tool at its tip, wherein the drive shaft is moved in the axial direction by driving. It is characterized in that it is slidably fitted in a rotatable and rotatable transmission sleeve and that it can be integrally coupled with the transmission sleeve at a predetermined position lowered with respect to the transmission sleeve.

[0007]

Before the boring is started, the drive shaft is lowered to a predetermined position with respect to the transmission sleeve, and then is integrally connected to the transmission sleeve. This allows the drilling tool carried on the tip of the drive shaft to reach the vicinity of the workpiece in advance. Therefore, if the transmission sleeve is driven to rotate and at the same time moved downward, the drilling tool integrated with the transmission sleeve via the drive shaft can immediately engage the workpiece and start the drilling operation.

[0008]

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

As shown in FIG. 1, the punching device 1 is provided with a transmission sleeve 3 which is supported in a casing 2 so as to be capable of advancing and retracting and rotating in the axial direction.
Is driven to rotate by an electric motor 5 via a gear transmission means 4. Therefore, the spur gear 6 fitted in the transmission sleeve 3 transmits only the rotational movement to the transmission sleeve 3 by spline coupling. An annular groove 7 is formed in the lower portion of the transmission sleeve 3, and an inward projection 9 of an elevating sleeve 8 fitted on the transmission sleeve 3 is engaged in the groove 7.

A rack 10 extending in the axial direction is formed on the outer peripheral surface of the lifting sleeve 8.
Further, a spur gear 12 which is integral with the handle 11 is meshed.
The elevating sleeve 8 or the transmission sleeve 3 is always held at its uppermost position unless the handle 11 is operated. Others are always held upward by suitable spring means.

A drive shaft 14 carrying a drilling tool 13 at its tip is slidably fitted in the transmission sleeve 3. On the upper end of the drive shaft 14, one or several locking pins 15 protruding in the radial direction are planted.
The locking pin 15 can be engaged in a considerable number of notches 16 formed in the upper edge of the transmission sleeve 3 (FIG. 2).
The notch 16 extends in the opposite direction to the rotation direction (clockwise) of the transmission sleeve 3. It is advantageous that a frictional force is generated between the drive shaft 14 and the transmission sleeve 3 to the extent that the position of the drive shaft 14 is held with respect to the transmission sleeve 3. In this case, by simply pulling up the drive shaft 14, the drilling tool 13 can be installed in the casing 2 of the drilling device 1.
It is held fully contained within.

At the lower end of the casing 2, a bag-shaped union nut 17 is provided with a union collar 18 integral with the casing 2.
It is fitted so as to be rotatable via. On the cylindrical peripheral wall 19 of the union nut 17, an appropriate number of tightening pins 20 are provided.
Is installed. A foldable operation lever 21 for facilitating the turning operation of the union nut 17 is attached to the outer peripheral portion of the union nut 17.

As shown in FIGS. 3 and 4, the union head 22 cooperating with the union nut 17 on the punching device side is
The head 23 has an outer diameter smaller than the inner diameter of the union nut 17. On the outer peripheral surface of the head portion 23, there is formed a guide groove (not shown) for passing each tightening pin 20 of the union nut 17. Further, on the lower end surface of the head portion 23, a support surface 24 for supporting each tightening pin 20 in the axial direction is formed following each guide groove, and each support surface 24 is formed from the guide groove to which it belongs. It is inclined so as to gradually descend as it moves away in the tightening direction (clockwise in this embodiment). Therefore, the union nut 17
After inserting into the union head 22, union nut 1
When 7 is rotated in the tightening direction, the union nut 17 is pushed downward simultaneously with the rotation through the tightening pin 20, that is, toward the union head 22.

The head 23 of the union head 22 is formed with a circular recess 25 for receiving the union collar 18 of the punching device 1 and at the same time centering it. Therefore, the bottom surface of the recess 25 has the union collar 1
A contact surface 26 with which 8 contacts is formed. The union head 22 further has a small diameter portion 27 following the head portion 23, and an internal thread of the small diameter portion 27 is capable of being screwed into a male screw of the connection opening 29 on the fluid pipe 28 side. Is provided.

In the case of this embodiment, the connection opening 29 is formed as a part of the valve casing 32 fixed to the fluid pipe 28 through the upper and lower saddles 30 and 31, because it is premised on the perforation by the uninterrupted water method. Has been done. That is, the valve casing 32 that is integrally connected to the upper saddle 30 is
A valve body 34 that can be rotated by a valve rod 33 is provided. The valve body 34, the valve casing 32, and the flow passages 35, 36, and 37 of the upper saddle 30 have an inner diameter that allows passage of the drilling tool 13. Have That is, the valve casing 32 and the upper saddle 30 together with the casing 2 of the drilling device 1 define a closed working space for drilling.

When connecting the punching device 1, first of all,
The union head 22 is firmly screwed into the connection opening 29 on the fluid pipe 28 side. Next, the punching device 1 is vertically lowered as shown by the large arrow in FIG.
Is inserted into the union head 22. After that, when the union nut 17 is rotated in the tightening direction using the operation lever 21, the tightening pin 20 rides on the support surface 24 of the union head 22, so that the union nut 17 is pushed down toward the union head 22. When the union nut 17 is pushed down in this manner, the union collar 18 integrated with the casing 2 is also pushed down, and eventually, the union head 22 is strongly pressed against the contact surface 26 of the union head 22.

When the connecting work of the punching device 1 to the connecting opening 29 is completed in this way, the punching work is started next. First, after rotating the valve element 34 to the open position via the valve rod 33, the drive shaft 14 is pushed down against the transmission sleeve 3 and slightly rotated counterclockwise, whereby the drive shaft 1
The locking pin 15 of No. 4 is engaged in the notch 16 of the transmission sleeve 3 (FIGS. 2 and 4). As a result, the drive shaft 14 is integrally connected to the transmission sleeve 3. At this time, the drilling tool 13 carried on the tip of the drive shaft 14 has already reached the workpiece, that is, the vicinity of the fluid pipe 28. Therefore, the switch of the electric motor 5 is turned on, and the power of the electric motor 5 is transmitted to the transmission sleeve 3 as a clockwise rotational movement via the gear transmission means 4, and at the same time, the handle 11 is rotated to move the lifting sleeve 8 and If the transmission sleeve 3 is slightly lowered, the drilling tool 13 integrated with the transmission sleeve 3 via the drive shaft 14 can immediately engage with the fluid pipe 28 to start the drilling work (FIG. 4). .

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions may be made without departing from the scope of the present invention. Included in the present invention. For example, the configuration of the present invention can be applied to a manual punching device. In this case, the transmission sleeve, which is rotationally driven by hand, must be screwed directly into the casing of the drilling device so that it can move axially at the same time as the rotary movement.

[0019]

According to the present invention, since the drilling tool can be moved quickly to the vicinity of the workpiece in advance, when the drilling tool is rotationally driven, the drilling work can be performed by feeding the drilling tool only a little. It is possible to start and therefore the efficiency of the drilling operation is greatly improved.

[0020]

[Brief description of drawings]

FIG. 1 is a side view including a partial cross section of a punching device according to an embodiment of the present invention.

FIG. 2 is a side view including a partial cross section showing the operation of the punching device of the embodiment.

FIG. 3 is a side view including a partial cross-section of the perforation device and the entire fluid pipe of the embodiment.

FIG. 4 is a side view including a partial cross-section of the punching device and the entire fluid pipe of the embodiment.

FIG. 5 is a side view including a partial cross section of a conventional punching device.

[Explanation of symbols]

1 Punching Device 2 Casing 3 Transmission Sleeve 4 Gear Transmission Means 5 Electric Motor 6 Spur Gear 7 Groove 8 Elevating Sleeve 9 Protrusion 10 Rack 11 Handle 12 Spur Gear 13 Drilling Tool 14 Drive Shaft 15 Locking Pin 16 Notch 17 Union Nut 18 Union Collar 19 Peripheral wall 20 Tightening pin 21 Operation lever 22 Union head 23 Head 24 Supporting surface 25 Recess 26 Abutting surface 27 Small diameter portion 28 Fluid pipe 29 Connection opening 30 Upper saddle 31 Lower saddle 32 Valve casing 33 Valve rod 34 Valve body 35 distribution hole 36 distribution hole 37 distribution hole

Claims (4)

[Claims] 1. A drilling device having a drive shaft for carrying a drilling tool at its tip, the drive shaft being slidably inserted in a transmission sleeve which is movable and rotatable in the axial direction by driving. The punching device is capable of being integrally coupled with the transmission sleeve at a predetermined position where the transmission sleeve is lowered. 2. The drive shaft is integrally coupled with the transmission sleeve by engaging a locking pin embedded in the drive shaft with a notch formed in the transmission sleeve. Perforator. 3. The punching device according to claim 1, wherein the drive shaft reaches immediately before the workpiece at a predetermined position where the drive shaft is lowered relative to the transmission sleeve. 4. The frictional force generated between the drive shaft and the transmission sleeve to the extent that the position of the drive shaft is maintained with respect to the transmission sleeve. Punching device.