JPH0746413Y2 - Cutting piece holding mechanism of perforator for fluid pipe - Google Patents

Description

[Detailed Description of Device] a. The present invention relates to a drilling device for drilling a fluid pipe such as a water pipe, and more particularly, to holding a cutting piece attached to a drill forming a drilling portion at the tip of the drilling device. Regarding the mechanism.

[Conventional technology]

The applicant of the present invention has previously proposed a cut piece holding mechanism of this type in Japanese Utility Model Publication No. 52-18476.

That is, in this prior art, a drilling device is formed by forming a blade body at equal intervals on the lower end of an annular cutter having a rotating shaft projecting at the upper center and projecting a drill at the inner center of the cutter. In the section, notches are formed on both sides of the drill, and a U-shaped hooking claw is loosely inserted into the hole formed in the notches. With this structure, the drill is in a drilled state. In some cases, the locking claw is restrained by the hole wall, and when the drill finishes drilling, the locking claw opens outward due to centrifugal force,
It supports the cut piece from below.

However, according to the prior art, in the transverse plane of the pipe, when the drill and cutter hit at right angles to the axis, i.e. in normal use, this is not a problem, as in the case of drilling mud spouts, When eccentric from the axis or when inclined with respect to the transverse plane as in the case of perforation of a branch port, the following problems will occur.

FIG. 7 illustrates this situation, where a is a pipe and b
Is a drill that expands outward when the locking claw d is released from the constraint of the hole c while the drill b is drilling the hole c in the pipe a. In the eccentric / inclined state of the shaft, the inner wall of the pipe a is close to the side surface of the drill b, and the distance α may be smaller than the length of the locking claw d.

In this state, if the drill b continues to rotate, the tip of the locking claw d is rubbed against the inner wall of the pipe a and enters a biting state, which damages the locking claw d or stops the rotation of the drill b. It stands up.

[Problems to be solved by the invention]

The present invention has been made in view of the above circumstances and has been made to solve the problems of the above-described prior art, and is a cutout of a perforation device that allows a locking claw to function normally even when a pipe is perforated in an eccentric or inclined state. An object is to provide a one-sided holding mechanism.

B. Configuration of the Invention [Means for Solving the Problems] The cut piece holding mechanism of the drilling device for a fluid pipe of the present invention adopts the following configuration (technical means) in order to achieve the above object. That is, at the bottom of the rotary drive shaft that is linked to the drive source,
A cutter having a cylindrical shape and a drill arranged on the central axis of the cutter and protruding from the lower end surface of the cutter are attached, and an expandable locking claw is provided at an intermediate portion of the drill. In the drilling part of the drilling device, the drill comprises a small-diameter columnar shaft part and a large-diameter drill main body provided under the shaft part through a step part, and the locking claw is the shaft of the drill. It is accommodated in a notch recess formed in the portion so as to be able to open, and the shaft portion of the drill is stretched outward at the upper end of the body without the outer diameter of the body exceeding the diameter of the drill body. An opening / closing cylinder having a flanged portion is fitted so as to be vertically movable over a length that shields the cutout concave portion, and is restricted in movement by a holding member that allows movement with a predetermined force or more. Characterize.

[Action]

The fluid pipe is perforated by a drill, the drill enters the pipe through a hole formed in the pipe wall, and the opening / closing cylinder that holds the locking claw in a restricted state also enters the pipe. When the collar of the opening / closing cylinder contacts the pipe, the drill further enters the pipe with the opening / closing cylinder left in the hole mouth, and when the locking claw is disengaged from the lower end of the opening / closing cylinder, the locking claw is perpendicular to the drill shaft. It falls in the direction and spreads out.

〔Example〕

An embodiment of a cut piece holding mechanism of a punching device of the present invention will be described with reference to the drawings.

1 to 3 show an embodiment thereof. That is, the first
The drawings show the entire structure of the perforating part including the cutter and the drill of this perforating device, and FIGS. 2 and 3 show the structure of the main part thereof.

In the figure, 1 is a rotary drive shaft, and as will be described later,
The upper part works with the drive source. A cylindrical cutter 2 and a drill 3 arranged on the central axis of the cutter 2 are fixedly installed under the rotary drive shaft 1.

The cutter 2 has a saw blade 2a at the lower end thereof.

The drill 3 includes a shaft portion 4 and a drill body 5, and is further connected to the rotary drive shaft 1 via a shank portion 6 on an upper portion thereof.

More specifically, the shaft portion 4 has a right cylindrical shape, the outer diameter of the drill body 5 is larger than that of the shaft portion 4, and a step portion 8 is formed at the boundary between the two.

A lower portion of the shaft portion 4 is formed with a notched concave portion 9 in which both side surfaces are notched in parallel over a predetermined length, and the lower portion of the notched concave portion 9 has a shaft hole penetrating the wall body 4a.
10 will be opened.

The locking claws 12 are mounted in the cutout recesses 9 and the shaft holes 10.
That is, the locking claw 12 is formed by bending a round steel rod into a U shape, the central shaft portion 12a is rotatably inserted into the shaft hole 10, and the receiving portions 12b at both ends are inside the notched recessed portion 9. It is housed so that it can be undulated along its parallel wall surface. When the receiving portion 12b falls outward, the receiving portion 12b is supported by the lower surface of the notch concave portion 9 and maintains a posture perpendicular to the axis of the shaft portion 4. Further, when the receiving portion 12b of the locking claw 12 is housed in the notch recess 9, the outer side thereof does not protrude from the outer side surface of the shaft portion 4 of the drill 3, and the shaft portion 12a serves as a rotation shaft. When tipping outward, the tip of the drill 3 projects sufficiently from the outer surface of the body 5 of the drill 3.

Then, the notch concave portion 9 is closed to close the shaft portion 4 of the drill 3.
An opening / closing cylinder 14 is mounted around the rotatably movable body.

The opening / closing cylinder 14 is composed of a cylindrical cylinder body 15 and a flange portion 16 stretched outward at an upper end portion of the cylinder body 15, and a lower surface (contact surface) 17 of the flange portion 16 is tapered. Formed into a shape. The outer diameter of the collar 16 is larger than the outer diameter of the drill body 5, but the outer diameter of the cylinder body 15 does not exceed the outer diameter of the drill body 5. For this reason, the cylinder body 15 easily passes through the inside of the hole drilled by the drill 3, and the collar portion 16 is locked to the end surface of the hole. Open / close cylinder
The lower end surface of 14 abuts on the stepped portion 8.

On the upper part of the open / close cylinder 14, a holding member 19 that holds the open / close cylinder 14 at a steady position is attached. The holding member 19 allows the opening / closing cylinder 14 to move upward only when a force of a predetermined size and direction is applied, and prevents it from moving unintentionally beyond that, and in this embodiment, it has wear resistance. Although a rubber ring (O ring) is used, other members (for example, a hard elastic ring divided into one) can be freely used as long as they have this function.

Alternatively, the inner diameter of the upper part of the opening / closing cylinder 14 may be reduced and the drill 3
It is also possible to achieve self-holding by press-contacting the shaft portion 4 of.

The configuration of the punching portion of the punching device according to the present embodiment is as described above. A drive source is linked to the upper part of the rotary drive shaft 1 via a feed mechanism, and further, a housing for holding these is kept watertight. Is provided. The feed mechanism is interlocked with the feed handle outside the housing, and the forward and reverse rotation of the feed handle causes
The perforated portion can be freely moved in and out of the housing.

The configuration other than the above-mentioned perforated portion is a known mechanism and is not directly related to the present invention, and a description thereof will be omitted.

The present punching device having such a punching portion, when punching a pipe, has a casing with a branch pipe (usually a split T
Character pipes are used), and water control valves connected to the branch cylinders are watertightly mounted.

The perforation device is mounted on the water control valve via the housing, the water control valve is opened, and the perforation part of the perforation device is advanced into the water control valve and the branch pipe of the casing to perform the perforation work of the pipe P. To do.

The operation of the present cut piece holding mechanism in this punching operation will be described with reference to FIGS. 4 and 5. In the figure, P is a pipe to be perforated, and this perforation work is performed in a state of being eccentric with respect to the pipe axis. Further, the vertical relationship in the drawing is an extrinsic matter, and the relative relationship with respect to the axial center of the pipe P has priority, and the upper direction corresponds to the outer diameter direction with respect to the pipe P and the lower direction corresponds to the axial center direction with respect to the pipe P.

FIG. 4 shows a piercing process in the course of this piercing work. The drill 3 pierces a small-diameter central hole Q in the pipe P with the cutting edge 5a of the main body portion 5, and the piercing by the cutter 2 around this central hole Q is performed. Done.

The drill 3 enters the pipe P, covers the notch recess 9 and holds the locking claw.
The open / close cylinder 14 that restrains the protrusion of 12 also enters the pipe P through the perforation Q. Then, the lower surface 17 of the collar 16 of the opening / closing cylinder 14
When comes into contact with the pipe P, the axial movement of the opening / closing cylinder 14 stops,
Move only the drill shaft forward. As a result, the cutout recess 9 is gradually exposed from the lower end of the opening / closing cylinder 14.

When the tip position of the locking claw 12 comes off the lower end surface of the opening / closing cylinder 14,
The locking claw 12 is released from the opening / closing cylinder 14 and tilted in the right angle direction by the centrifugal action of the rotating drill shaft. At this time, since the distance α from the side surface of the drill 3 to the inner wall of the pipe P is sufficiently larger than the length of the locking claw 12, the locking claw 12 does not contact the inner wall surface of the pipe P.

After that, the pipe P is cut off by the cutting edge portion 2a of the cutter 2, and the perforation R is opened in the pipe P.

FIG. 5 shows the lifting process after the perforation process.

That is, as the punched portion, that is, the cutter 2 and the drill 3 are retracted, the cut piece S is locked by the locking claw 12, held by the cutter 2 and carried to the outside of the pipe P.

Therefore, according to the cut piece holding mechanism of the apparatus of the present embodiment, the opening / closing cylinder 14 can be used even during the punching work in the eccentric and inclined state.
Delays the release of the locking pawl 12 and thus the tube P of the locking pawl 12
Since there is no contact with the inner wall of, the contact damage of the rotating locking claw 12 is reliably prevented.

The structure of the opening / closing cylinder 14 is not limited to the above-described mode, and other modes can be adopted as long as they have equivalent functions.

The embodiment shown in FIG. 6 accommodates the retaining ring 19 in the collar portion 16 of the opening / closing cylinder 14, which is convenient because it does not require mounting work during punching work.

Further, by appropriately changing the length of the opening / closing cylinder 14, the stroke for expanding the locking claw 12 can be changed. That is, the longer the length of the opening / closing cylinder 14 is, the larger the expansion stroke of the locking claw 12 is.

Therefore, for example, in a mode in which the opening / closing cylinder 14 is held by the shaft portion 4 by itself, when the length of the opening / closing cylinder 14 is shortened and the lower end thereof is locked by the locking claw shallowly, the locking claw is slightly stroked. Therefore, it is also applicable to the drilling work in the normal state or the state where the eccentricity or inclination is not excessive.

The present invention is not limited to the above embodiment, and various design changes can be made within the scope of the technical idea of the present invention. That is, the following aspects are included in the technical scope of the present invention.

The structure of the locking claw is not limited to that of the above-described embodiment, and the locking claw may be arbitrarily tilted in only one direction. Alternatively, the two locking claws may be tilted in opposite directions.

Further, instead of the tilting type locking pawl expanding mechanism as in the embodiment, it is also possible to employ a type that pops out in the outer diameter direction by biasing a spring or the like.

C. Effect of the Invention According to the present invention, even when the perforation of the fluid pipe is performed in an eccentric or inclined state, the locking claw expands inside the pipe by the stroke determined by the opening / closing cylinder, and the pipe wall Therefore, the holding mechanism of the cut piece operates reliably and the punching operation can be performed smoothly.

Furthermore, an appropriate stroke can be determined depending on the length of the open / close cylinder, and it is possible to appropriately cope with the situation of eccentricity / inclination.

[Brief description of drawings]

The drawings show an embodiment of a cut piece holding mechanism of a punching device of the present invention, and FIG. 1 is a vertical cross-sectional view of a punching part of the embodiment, FIG.
The drawing is an enlarged cross-sectional view taken along line X-X in FIG. 1, and FIG. 3 is Y in FIG.
4 is a sectional view including a pipe P showing an operating state thereof, and FIG. 6 is a sectional view showing another aspect of the present invention. FIG. 7 is a view for explaining a state where the locking claws of the related art are expanded. 1 ... Rotary drive shaft, 2 ... Cutter, 3 ... Drill, 4
...... Shaft, 5 ... Drill body, 8 ... Step, 9 ... Notched recess, 12 ... Locking claw, 14 ... Opening / closing cylinder, 15 ... Main body,
16 ... Tsubasa

Claims (1)

[Scope of utility model registration request] 1. A cylindrical cutter and a drill, which is arranged on the central axis of the cutter and protrudes from the lower end surface of the cutter, are attached to the lower part of a rotary drive shaft that is interlocked with a drive source. In a drilling part of a drilling device, in which an expandable locking claw is provided in the middle part of the drill, the drill is a cylindrical part having a small diameter and a large part provided below the shaft via a step part. A drill body having a diameter, the locking claw is accommodated in a notch recess formed in the shaft portion of the drill so as to be expandable, and the outer diameter of the body is the diameter of the drill body in the shaft portion of the drill. And an opening / closing cylinder having a flange portion that extends outward at the upper end of the main body is fitted so as to be vertically movable over a length that shields the notched concave portion and has a predetermined force or more. The movement is constrained by a holding member that allows movement at The cut piece holding mechanism of the punching device to be used.