JPH0451926Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] For example, when forming a branch port in a water pipe, the present invention is particularly useful when forming a branch port in a water pipe without interrupting the flow of water in the water pipe. The present invention relates to a perforation device for a pipe peripheral wall, which is used when forming a pipe.

[Conventional technology]

With this type of pipe circumferential wall perforation device, when forming a branch port in a water pipe without water interruption, if the pipe circumferential wall portion cut out to form the branch port falls into the water pipe, the valve inserted in the water pipe may be damaged. If the circumferential wall of the cut-out pipe becomes clogged or the valve or the like is damaged, problems such as damage may occur. Therefore, when forming a branch port in a water pipe or the like without water interruption, it is important to reliably remove the cut peripheral wall portion of the pipe.

Therefore, in the past, as shown in FIG. 8, locking portions 5b are attached to both ends of a mounting shaft 5a that passes through the drill 2 in the radial direction and passes through the rotational axis X of the drill 2.
A locking member 5' having a locking part 5b arranged in a row is housed in a recess 4' formed in a peripheral surface near the tip of the drill 2 in a posture along the rotational axis X of the drill 2. The mounting shaft 5a is in the non-operating position shown by the two-dot chain line in the figure and in the working position shown by the solid line in the figure in which the locking portion 5b protrudes outward from the circumferential surface of the drill 2.
The locking member 5 is pivotally connected to the drill 2 so as to be able to change its posture by swinging around the axis 5x' of the locking member 5, and after passing through the drill hole a, the locking member 5 is changed to the operating posture by the centrifugal force generated as the drill 2 rotates. By locking the locking part 5b of ' to the peripheral edge of the drill hole a, the cut pipe peripheral wall part A1 is prevented from detaching from the drill 2, and the cut pipe peripheral wall part A1 is taken out together with the drill 2. Measures had been taken (for example,
-Refer to Publication No. 18476).

[The problem that the idea attempts to solve]

The conventional pipe circumferential wall drilling device configured as described above switches the operating posture of the locking member by swinging the locking member around the horizontal axis with respect to the drill. As shown in Japanese Patent No. 51-54452, a resilient annular locking ring is attached to a concave groove formed on the circumferential surface of the drill, and the resilient force of this resilient annular locking ring itself is used to operate the drill. Compared to a structure configured to change the posture and hold the cut-off trunk part, the ring part cut out with the cutter can be held securely even if it has a considerable weight. It is advantageous in some respects.

However, in the case of the above-mentioned conventional configuration, although the posture change of the locking member is performed using the centrifugal force generated as the drill rotates, the pivot axis of the locking member is centered around the rotation axis of the drill. Therefore, at the initial stage of changing the posture from the storage position to the working position, the direction of the centrifugal force acting on the pair of locking parts of the locking member and the direction of swinging of the locking parts. are substantially perpendicular to each other, and the component force used to swing the locking part of the centrifugal force acting on the locking part is small. For this reason, there is a drawback in that it is difficult to change the posture of the locking member when chips and the like generated during drilling with a drill are mixed into the recessed portion.

In view of the above-mentioned circumstances, an object of the present invention is to provide a drilling device for a pipe peripheral wall in which a locking member is attached to a drill so that the position can be changed freely by swinging around a horizontal axis. It is an object of the present invention to provide a pipe peripheral wall perforation device that can reliably perform perforation.

[Means to solve the problem]

The technical means of the present invention taken to achieve the above object are as follows: A drilling guide drill capable of drilling a hole in the pipe circumferential wall at the end of the drive rotating shaft; A drilling device for a peripheral wall of a pipe, which is equipped with a crown-shaped cutter that cuts out a circular shape when viewed, with the tip of the drill protruding beyond the cutter, and is equipped with the configurations described in [A] to [C] below. It is.

[A] A recess is formed in the circumferential surface near the tip of the drill to accommodate a locking member for preventing the section from falling off in a position along the rotational axis of the drill.

[B] The locking member for preventing the section from falling off may be in an inactive position housed in the recess, or protrude outward from the peripheral surface of the drill and lock at the peripheral edge of the drill hole from the tip side of the drill. On the circumference near the tip of the drill, the position can be freely switched between the working position and the working position.
It is pivoted so that it can swing freely around the horizontal axis.

[C] The horizontal axis, which is the center of swing of the locking member, is offset radially outward by a predetermined distance from the rotational axis of the drill so that its extension line does not intersect with the rotational axis of the drill. It is positioned so as to radially cross the drill at a certain point.

[Effect]

In other words, the locking member is housed in the recess of the drill in the non-working position, and is along the rotational axis direction of the drill, and with respect to this rotational axis, the horizontal axis, which is the center of swing of the locking member, is an extension of the rotational axis of the drill. Since the horizontal axis is set to be offset radially outward so that the line does not intersect with the rotation axis of the drill, the swinging direction of the locking member is radiated from the rotation axis of the drill. This is compared to the conventional configuration in which the horizontal axis, which is the center of swing of the locking member, intersects the rotational axis of the drill at a nearly right angle. Thus, in the initial stage of changing the posture of the locking member from the non-working position to the working position, more of the centrifugal force acting on the locking member is applied to change the posture of the locking member. .

In particular, if the locking member is provided so that the direction of swing from the non-working position to the working position coincides with the radial direction passing through the axis of the drill, almost all of the centrifugal force acting on the locking member will be absorbed. It can be used to change the posture of the locking member, and the posture of the locking member can be changed with a large force.

[Effect of idea]

As a result, it has become possible to smoothly change the posture of the locking member whose posture is changed by swinging around the horizontal axis from the non-operating posture to the working posture. Furthermore, since a larger force than before can be used to change the posture, it is now possible to change the posture of the locking member regardless of the presence of some chips or the like in the recess.

Therefore, as a whole, it is possible to provide a pipe peripheral wall drilling device with excellent workability, which can reliably change the posture of the locking member to the working position and reliably take out the cut pipe peripheral wall portion without detaching from the drill. Ta.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

The perforating device for a peripheral wall of a pipe according to the present invention is used, for example, when forming a branch port C for connecting a branch pipe B to a peripheral wall A of a water pipe, as shown in FIG.

As shown in FIGS. 1 to 4, this pipe circumferential wall drilling device includes a drill 2 for guiding a hole, which can drill a hole in a pipe circumferential wall A, at the end of a drive rotating shaft 1 driven by a motor or the like. , and a crown-shaped cutter 3 that cuts out the pipe peripheral wall portion A1 around the drill hole a drilled by the drill 2 into a circular shape when viewed in the direction of the rotation axis X, with the tip of the drill 2 protruding beyond the cutter 3. It is constructed by being fixed to.

As shown in FIG. 4, four recesses 4 are formed at the tip of the drill 2 at different phases of 90° in the circumferential direction of the drill 2. Among the four recesses 4, a pair of recesses 4 that face each other with a phase difference of 180° are made into a set, and the two recess pairs are positioned at different positions in the rotation axis X direction of the drill 2. It is provided.

Each recess 4 is provided with a locking member 5 for preventing the section from falling off, which is accommodated in a posture along the rotational axis X of the drill 2. Each locking member 5 is
It is pivoted by a screw 7 so that it can swing freely around the horizontal axis 5x on the tip side of the drill, and as shown in Figs.
The drill is configured to be able to change its posture by swinging between a non-working position shown in the figure in which it is accommodated in the recess 4 and a working position shown in FIG. 3 in which it protrudes from the circumferential surface of the drill 2.

After passing through the drill hole a, the locking member 5 is changed from a non-working position to a working position by the centrifugal force caused by the rotation of the drill 2, and in that working position, it is shown in FIGS. 3 and 5D. As shown, the drill 2 is configured to engage the peripheral edge of the drilled hole a from the drill tip side, and to remove together with the drill 2 the circumferential wall portion of the pipe cut by the cutter 3.

As shown in FIGS. 1 to 4, the horizontal axis 5x, which is the center of swing of each locking member 5, is arranged so that its extension line does not intersect with the rotation axis X of the drill 2.
It is positioned so as to cross the drill 2 in the radial direction at a location deviated radially outward by a predetermined distance from the rotation axis X of the drill 2. And each locking member 5
is provided so that the direction in which it starts swinging from its non-working position coincides with the radial direction passing through the rotational axis X of the drill 2.

Therefore, in order to change the posture of the locking member 5,
Almost all of the centrifugal force generated as the drill 2 rotates can be used, and since the horizontal axis 5x of the locking member 5 is displaced from the rotational axis X of the drill 2, a large centrifugal force can be used. They can act on the locking member 5, and thereby the posture of the locking member 5 can be changed smoothly and reliably.

As shown in FIGS. 1 to 3, each locking member 5 has a large swinging end portion 5A, and its center of gravity is located closer to the outer periphery of the drill 2 than the respective horizontal axis 5x. It is formed to be located on the side. Therefore, when the drill 2 is in the vertical position as shown in the figure, each locking member 5 can swing under its own weight and change its position from the non-working position to the working position even when the drill 2 is not rotating. This configuration also makes it possible to change the posture.

Further, in each recess 4, a cushion member 8 made of rubber is attached to the back of the swinging end portion 5A of the locking member 5 in the non-operating position. And the first
As shown in FIG. 2 and FIG. 2, when the drill hole a has not yet been drilled, the cushion material 8 is slightly elastically deformed by the abutting pressure of the swinging end portion 5A. A sleeve 6 that covers the locking member 5 so as to hold the locking member 5 in the housed position.
As the drill hole a is drilled by the drill 2, it comes into contact with the peripheral edge of the drill hole a and is slid in the direction of the rotational axis X, so that it is fitted onto the outside in such a manner that it can be released from the locking member 5. ing.

When the sleeve 6 is released from covering the locking member 5, the locking member 5 is pressed by the elastic restoring force of the cushion material 8 and starts to swing, changing from the non-working position to the working position. Posture changes are becoming easier.

Further, as described above, the locking member 5 is connected to the sleeve 6.
By capping the cushion member 8 against the elastic restoring force of the cushion member 8, the locking member 5 is prevented from vibrating and generating noise due to rotation of the drill.

Next, the peripheral wall A of the pipe by this perforating device for the peripheral wall of the pipe is
The drilling process for the branch port C will be explained.

As shown in FIG. 5A, when the drill hole a has not yet been drilled with the drill 2, the sleeve 6 is fitted over the drill 2 and the sleeve 6 is covered with the sleeve 6, as described above. By doing so, 4
All of the two locking members 5 are held housed within the recess 4.

After the drill hole a is formed in the peripheral wall A of the pipe by the drill 2, the drill hole a is fitted into the drill hole a and positioned, and as shown in FIG. Cutting of the pipe peripheral wall portion A1 around the drill hole a by the cutter 3 is started.

As the branch port C is drilled by the cutter 3, the sleeve 6 has its tip end edge aligned with the drill hole a.
When it comes into contact with the peripheral edge of the sleeve 6 and is pressed, it slides backward with respect to the drill 2, and the covering by the sleeve 6 is gradually released from one end in the axial direction. Then, as shown in FIG. 5C, the locking member 5
When the locking member 5 passes through the drill hole a, the centrifugal force generated by the rotation of the drill 2 changes the posture of the locking member 5 to the working position as described above.

Once the drilling of the branch port C with the cutter 3 is completed,
By pulling up the drive rotation shaft 1, the locking member 5 in the working position locks on the peripheral edge of the drill hole a from the drill tip side. This prevents the cut pipe peripheral wall portion A1 from detaching from the drill 2,
As shown in FIG. 5D, this tube peripheral wall portion A1 can be taken out together with the drill 2.

In addition, in the pipe circumferential wall drilling device described in this embodiment, the locking member 5 is rotated at 90° in the circumferential direction of the drill 2.
The 5th one has 4 pieces with different phases.
In addition to forming the branch port C on the upper surface of the pipe peripheral wall A as explained in Figures A to D, when performing drilling work such as forming the branch port C on the side surface of the pipe peripheral wall A, the cut pipe This is to ensure that the peripheral wall portion A1 can be taken out in the same way.

That is, as shown in FIG. 7, even when drilling is performed from the side, at least one or two of the four locking members 5 provided in the circumferential direction
The piece is changed to the working position and comes into contact with the peripheral edge of the drill hole a, and the cut pipe peripheral wall portion A1 can be taken out together with the drill 2.

In order to prevent the pipe peripheral wall portion A1 from falling off when drilling the side surface of the pipe A, the locking member 5 is used.
It is sufficient to provide at least three locking members 5 with substantially equal phase differences in the circumferential direction of the drill 2, but in carrying out the present invention, only one or two locking members 5 are provided. In short, the number of locking members 5 is not limited.

In addition, in the previous embodiment, as shown in FIG.
A pair of locking members 5 provided with a phase difference of 180°
As shown in FIG. 3, two sets of locking members 5 are provided at different positions in the direction along the rotation axis X of the drill 2, that is, as shown in FIG. Horizontal axis 5X of the pair of locking members 5 indicated by solid lines
, the horizontal axis 5 of the locking member 5 shown by the dotted line in the same figure.
A structure configured to be located slightly above X in the illustrated state has been described. Locking member 5 on drill 2
In order to reduce the decrease in the strength of the drill 2 by forming the recess 4 for accommodating the Although it is preferable that the locking members 5 are configured to have different positions in the direction along the rotation axis X of the drill 2, in carrying out the present invention, They may be provided at the same height position in the direction along the axis X.

Furthermore, in carrying out the present invention, the structure of covering the locking member 5 with the sleeve 6 may be omitted. That is, even if the locking member 5 is in the working position before drilling the drill hole 6, the drill 2 is not in the drill hole a.
When passing through the drill hole a, the locking member 5 comes into contact with the periphery of the drill hole a and is swung to change its posture to a non-working position. This is because the centrifugal force generated by rotation changes the working posture.

Further, a biasing mechanism such as a spring may be provided in place of the cushion material 8, and furthermore, such a biasing mechanism may be omitted.

The shape of the locking member 5 can be changed as appropriate; for example, it may be U-shaped and have a pair of swinging arms. Further, the center of gravity of the locking member 5 does not necessarily have to be located on the outer side of the drill 2 with respect to the horizontal axis 5x.

In addition to water pipes, pipes to be perforated by the pipe circumferential wall perforation device according to the present invention include pipes for transporting various liquids and gases, such as gas pipes.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of drawings]

1 to 7 show an embodiment of the pipe peripheral wall drilling device according to the present invention, FIG. 1 is a longitudinal sectional view of the tip of the drill when the locking member is in a non-operating position, and FIG. A partially cutaway side view of the drill tip in a non-working position, FIG. 3 is a longitudinal sectional view of the drill tip in the working position of the locking member, FIG. 4 is a cross-sectional view of the drill tip, and FIGS. 5 A to 5 are drilling holes. A sectional view showing the process, FIG. 6 is a partially cutaway view of a water pipe, and FIG. 7 is a cross-sectional view when the drill is in a horizontal state. FIG. 8 is a perspective view showing a conventional example. DESCRIPTION OF SYMBOLS 1... Drive rotation shaft, 2... Drill, 3... Cut, 4... Recess, 5... Locking member, 5x... Horizontal shaft center, A... Pipe peripheral wall, X... Rotation shaft center, a ...Drill hole.

Claims (1)

[Claims for Utility Model Registration] 1. A drilling guide drill 2 capable of drilling a hole in the pipe circumferential wall A at the end of the drive rotation shaft 1, and a pipe circumferential wall portion A1 around the drill hole A viewed in the direction of the rotation axis X. A crown-shaped cutter 3 that is cut into a circular shape is attached in such a way that the tip of the drill 2 protrudes beyond the cutter 3, and the pipe peripheral wall has the configuration described in [A] to [C] below. perforation device. [A] A recess 4 is formed in the peripheral surface near the tip of the drill 2 to accommodate a locking member 5 for preventing the section from falling off in a posture along the rotational axis X of the drill 2. [B] The locking member 5 for preventing the section from falling off is
The drill can be freely switched between a non-working position in which it is accommodated in the recess 4 and a working position in which it protrudes outward from the circumferential surface of the drill 2 and engages the peripheral edge of the drill hole a from the drill tip side. 2
It is pivotally attached to the circumferential surface near the tip so as to be swingable around the horizontal axis 5X. [C] The horizontal axis 5X, which is the center of swing of the locking member 5, is radially spaced a predetermined distance from the rotation axis X of the drill 2 so that its extension line does not intersect with the rotation axis X of the drill 2. It is positioned so as to traverse the drill 2 in the radial direction at a location that is biased toward the outside. 2. The pipe circumferential wall drilling device according to claim 1, wherein three or more locking members 5 are provided with substantially equal phase differences in the circumferential direction of the drill 2.