JP2002187014A - Tip tool for cutting rising pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tip tool for cutting a rising pipe capable of easily and horizontally cutting a rising pipe at a predetermined position. SOLUTION: A disc cutter 2 is mounted to a tip 1a of an axial rod part 1 concentrically with an axis center L of the axial rod part 1. The axial rod part 1 is rotated on axis center L by a driving machine 4 connected to a base end 1b of the rod part and cuts a rising tube from within. To be more precise, a circular butt plate 5 externally fitted to the axial rod part 1 and a set screw 6 fitted into a screw hole 8 piercing from the outer peripheral surface to the inner peripheral surface of the circular butt plate 5 are provided, and on the axial rod part 1 a helical groove 7 in a direction opposite to a rotative direction by the driving machine 4 in a plan view is set from the base end 1b side to the tip 1a side of the axial rod part 1. The circular butt plate is fixed to the axial rod part 1 by making the tip of the set screw 6 project from the inner peripheral surface of the circular butt plate and press-contact a groove bottom part 7a of the helical groove 7 of the axial rod part 1. The rising pipe is cut while the surface 5a on the disc cutter 2 side of the circular butt plate 5 is made to contact an opening end surface of the rising pipe 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a riser cutting tool for cutting a riser protruding from a floor surface at a predetermined position below the floor surface in a ring shape from an inner surface side.

[0002]

2. Description of the Related Art A conventional tip tool for cutting a rising pipe has a shaft rod portion having a disk cutter mounted concentrically with a shaft center at a distal end thereof, and the shaft rod portion is driven by a driving machine connected to a base end thereof. ,
The riser pipe that rotates around the axis and protrudes from the floor is cut into a ring shape from the inside at a predetermined position below the floor.

[0003]

However, in a conventional tip tool for cutting a rising pipe, a predetermined (depth) position of the rising pipe to be cut is a measure, and the cut surface of the rising pipe is not horizontal. Other pipes could not be reliably connected to the riser, causing water leakage. Also,
It was necessary to mark a predetermined position for cutting, which was troublesome.

Accordingly, an object of the present invention is to provide a rising pipe cutting tip tool that can easily and horizontally cut a rising pipe at a predetermined (depth) position.

[0005]

In order to achieve the above-mentioned object, a riser cutting tool according to the present invention comprises a shaft having a disk cutter mounted concentrically with a shaft at a front end thereof.
In a rising pipe cutting tip tool for rotating the shaft rod portion around an axis thereof by a driving device connected to a base end thereof and cutting the riser tube from the inside, a contact fitting externally fitted to the shaft rod portion. A disk, and a set screw which is screwed into a screw hole which is provided through the inner peripheral surface from the outer peripheral surface of the circular plate. The shaft rod portion has a direction opposite to the rotation direction by the driving device in plan view. Spiral groove is provided from the base end side to the distal end side of the shaft rod portion, and the tip of the set screw is projected from the inner peripheral surface of the abutment disk to form a groove bottom of the spiral groove of the shaft rod portion. By being brought into pressure contact, the abutment disk is fixed to the shaft bar portion, while one surface of the abutment disk on the disk cutter side is in contact with the opening end surface of the riser pipe,
The riser is cut off.

An annular bulge is provided on one surface of the contact disk along the outer peripheral edge thereof. Further, a disk cutter is screwed to the distal end surface of the shaft bar from the axial direction of the shaft bar.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

[0008] The tip tool for cutting a riser pipe according to the present invention comprises:
As shown in FIGS. 1 to 3, a shaft rod portion 1 having a disk cutter 2 attached to a distal end 1 a is provided, and the shaft rod portion 1 has a base end 1 b.
Is rotated around the axis L by the driving machine 4 connected to
Rise pipe 3 (such as drainage PVC pipe) protruding from floor G
At a predetermined position below the floor G from the inside in a ring shape.

The driving machine 4 is a portable power tool such as an electric or pneumatic grinder, for example, and a driving shaft 9 of the driving machine 4 is arranged in a direction of an axis L provided on a base end 1 b of the shaft 1. The shaft rod 1 is connected to the mounting hole 10 shown in FIG.
Rotate in the direction.

A spiral groove 7 is provided in the shaft 1 in a direction opposite to the direction of rotation (in the direction of arrow A) by the driving device 4 in a plan view from the base 1b to the tip 1a of the shaft 1. I have. For example, if the rotation A direction is right in plan view, a left-handed spiral groove 7 is formed in the shaft 1, and if the rotation A direction is left-handed, the spiral groove 7 is right-handed. I do.

The disk cutter 2 has a blade portion 11 on the outer peripheral side, which has a large number of diamond fines and cuts the rising pipe 3.
Concentrically with the axis L of the shaft 1, screws are fixed to the surface 1 a of the tip 1 a of the shaft 1 from the direction of the axis L. More specifically, a plurality of protrusions 13 (which coincide with the axis L) of the tip 1 a of the shaft 1 are fitted into the center hole 12 of the disk cutter 2 and are arranged at a predetermined pitch around the axis L. The disk cutter 2 is screwed to the tip 1a of the shaft 1 from below with three (three) screws 14. The screw 14 is screwed into the screw hole of the shaft 1 (the tip 1a) via an elastic film (such as plastic) to prevent the screw 14 from being loosened.
Therefore, from the side view, only the head of the screw 14 protrudes from the lower surface of the disk cutter 2, there is no dead space below the disk cutter 2, and unnecessary (concrete) concrete is formed on the inner surface of the riser pipe 3. Even if there is a hit (interfering object) such as the attached matter 15 (see FIG. 2), the vicinity of the attached matter 15 can be cut.

A (circular) contact disk 5 is provided on the shaft 1.
It is fitted externally concentrically with the axis L. Specifically, the contact disk 5 has a screw hole 8 penetrating from the outer peripheral surface to the inner peripheral surface. A set screw 6 is screwed into the screw hole 8, and a tip 6 a of the set screw 6 is connected to the screw hole 8. , Protruding from the inner peripheral surface of the contact disk 5,
It is fitted into the spiral groove 7 of the shaft rod 1 {at the groove bottom 7a}.
─Pressing the contact disk 5 into the spiral groove 7 of the shaft rod portion 1
To the outside.

Then, the rising pipe 3 is cut by the disk cutter 2 while the one surface 5 a (lower surface) of the contact disk 5 on the disk cutter 2 side is in contact with the opening end face of the rising pipe 3.

The distal end 6a of the set screw 6 has a shape in which the outer peripheral edge protrudes so as to easily bite into the spiral groove 7, and a hexagon wrench (not shown) is fitted to the base end of the set screw 6. A hexagonal hole 16 is provided so that the set screw 6 can be advanced and retracted with a hexagonal wrench.

The spiral groove 7 at the tip 6a of the set screw 6
Is released from the contact with the groove bottom 7a, and the tip 6a
Is inserted into the spiral groove 7 so that the set screw 6 is
, The contact disk 5 can be moved only along the spiral groove 7. At this time, by rotating the shaft 1 in the direction of arrow A (the direction of rotation by the drive unit 4), the contact disk 5 can be screwed forward by the screw action so as to approach the disk cutter 2 side. .

Further, by retracting the tip 6a of the set screw 6 into the screw hole 8 of the backing disk 5, the backing disk 5 is moved in the axial direction and around the axial center with respect to the shaft rod portion 1. Can be moved.

One surface 5a of the contact disk 5 has a (annular) flat surface 19 and a cylindrical inner peripheral wall protruding from the center of the flat surface 19.
And an annular bulging portion 17 having a small radius r provided along the outer peripheral edge of the flat surface 19. Therefore, when the one surface 5a of the contact disk 5 is brought into contact with the opening end surface of the riser tube 3, only the annular bulging portion 17 comes into contact, and the contact area (and the frictional resistance thereby) can be reduced.

The radius of the contact disk 5 is set to be larger than the radius of the disk cutter 2 plus the thickness t of the riser pipe (see FIG. 2), so that the contact disk 5 can be securely fixed. The rising pipe 3 can be cut by the disk cutter 2 while being brought into contact with the opening end face of the rising pipe 3.

Next, a method of cutting the riser pipe 3 with this tool will be described with reference to FIGS. First, (Fig. 2
As shown in (1), when cutting the riser pipe 3 at a cutting position Z at a predetermined depth D from the floor surface G, loosen the set screw 6 and
The contact disk 5 is moved in the direction of the axis L of the shaft rod portion 1, and the length from one surface 5 a (annular bulging portion 17) of the contact disk 5 to the disk cutter 2 is measured from the opening end surface of the rising pipe 3. A predetermined length H up to the cutting position Z is set, the set screw 6 is tightened, and the contact disk 5 is fixed to the shaft rod portion 1. When the setting is performed by screwing the contact disk 5 to the shaft rod portion 1, the setting can be performed easily, quickly, and accurately.

Then, the shaft center L of the shaft portion 1 is connected to the riser 3
The disk cutter 2 is inserted into the riser pipe 3 while keeping the disk cutter 2 parallel to the axis of the riser 3, and when the one surface 5 a of the contact disk 5 comes into contact with the opening end face of the riser pipe 3, the disk cutter 2 ( Is brought into contact with the inner surface of the riser 3.

After that, the shaft 4 is rotated in the direction of arrow A by the driving machine 4 and the cutting of the riser pipe 3 is started by the disk cutter 2. At this time, since the contact disk 5 that is in sliding contact with the opening end surface of the riser pipe 3 is also rotating in the direction of arrow A,
The shaft rod portion 1 makes a translational movement from the near side of the paper surface of FIG. 2 to the back direction {the direction of arrow B in FIG. 1 (the direction opposite to the arrow A)}.

Then, the body of the drive unit 4 is strongly grasped by hand, and a force is applied to the body in a direction opposite to the translation of the shaft 1 to resist the translation of the shaft 1. Machine 4 (shaft rod 1) is translated little by little along the inner peripheral surface of the riser 3 so that the riser 3 is cut from the inside into a ring shape in a direction perpendicular to the axis of the riser 3. can do.

Since the rising pipe 3 is cut by the disk cutter 2 while the abutment disk 5 is in contact with the opening end face of the rising pipe 3, the cutting can be reliably performed at the cutting position Z. The cut surface of the riser pipe 3 can be made horizontal.

Next, the force acting on each part during cutting is shown in FIG.
Will be described. When the contact disk 5 is pressed against the opening end surface of the riser tube 3, an upward pushing force P (as a reaction force) acts on the contact disk 5. On the other hand, one surface 5a of the contact disk 5 is
By being in sliding contact with the opening end face of the riser pipe 3, it receives a strong rotational torque (frictional resistance force) M in the direction opposite to the arrow A, and the disk 5 is accordingly rotated (the direction of the spiral groove 7 is as described above). ) So as to go downward, as indicated by an arrow T. Due to the force in the direction of the arrow T, the above-mentioned pushing-up force P is reduced or offset, and the force acting on the press-contact (fixing) portion between the tip 6a of the set screw 6 and the groove bottom 7a of the spiral groove 7 is relatively small. Become. As a result, the distal end 6a of the set screw 6 maintains the press-contacted state at the groove bottom 7a for a long period of time, thereby preventing a problem that the set screw 6 is suddenly loosened.

Next, the sliding contact portion between the contact disk 5 and the riser pipe 3 in the above cut state is shown in FIG.
Is in sliding contact with the opening end surface of the riser pipe 3 only at the annular bulging portion 17. Thus, the sliding contact area can be reduced, and heat generation can be reduced. Therefore, loosening of the set screw 6 and damage to the blade 11 of the disk cutter 2 (carbonization of diamond) due to heat generation can be prevented. In addition, the reduction of the sliding contact area can reduce the rotational torque resistance of the shaft 1 and prevent the contact disk 5 from rolling.

FIG. 6 shows another embodiment of the contact disk 5, in which one surface 5a of the contact disk 5 has a concave portion having a large radius R (instead of the flat surface 19 shown in FIG. 3). It has a curved surface 20. Therefore, the portion of the abutment disk 5 that is in sliding contact with the riser tube 3 can be reliably made only of the annular bulging portion 17.

The present invention is not limited to the above-described embodiment. For example, a screw hole in the radial direction may be provided in the cylindrical inner peripheral wall 18 of the contact disk 5. Further, a spiral ridge may be formed in the axial hole 23 of the cylindrical inner peripheral wall 18 so as to be screwed into the spiral groove 7 of the axial rod portion 1. In this case, the set screw 6 is attached to the axial rod portion 1. Not only the groove bottom portion 7a of the spiral groove 7 but also the ridge portion may be pressed and fixed. Thus, design changes can be made without departing from the spirit of the present invention.

[0028]

Since the present invention is configured as described above, the following effects can be obtained.

One surface 5 of the contact disk 5 (according to claim 1)
Since the riser pipe 3 is cut while a is in contact with the opening end face of the riser pipe 3, the riser pipe 3 can be easily cut horizontally at a predetermined (depth) position. In addition, the movement of the shaft bar portion 1 of the contact disk 5 in the direction of the axis L is facilitated, and the distance between the contact disk 5 and the disk cutter 2 is adjusted.
The adjustment of the cutting depth of the becomes easy. Further, even if the abutment disk 5 is in contact with the riser pipe 3, the set screw 6 is not loosened by the screw action of the shaft rod 1 (spiral groove 7) and the set screw 6, and The riser tube 3 can be securely fixed at a predetermined position because it can be securely fixed to the shaft rod portion 1.

According to the second aspect of the present invention, since the contact portion of the contact disk 5 with the riser tube 3 can be formed only by the annular bulging portion 17, the sliding contact area can be reduced and heat generation can be reduced. .
Therefore, loosening of the set screw 6 and damage of the blade 11 of the disk cutter 2 due to heat generation {carbonization of diamond}
Can be prevented. Further, by reducing the sliding contact area, the resistance of the rotating torque of the shaft 1 can be reduced, and
Rotation chatter of the contact disk 5 can be prevented.

(According to claim 3) The disk cutter 2 is
From the direction of the axis L of the shaft 1 to the surface 1a of the shaft 1
Since the screw is used, the thickness dimension below the disk cutter 2 can be reduced, dead space below the disk cutter 2 is eliminated, and unnecessary (such as concrete) deposits 15 are present on the inner surface of the riser pipe 3. Also, it is possible to cut the vicinity of the attached matter 15. Further, replacement of the disk cutter 2 becomes easy.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a partial sectional side view showing a use state of the present invention.

FIG. 3 is a sectional side view of a main part.

FIG. 4 is an explanatory diagram of an operation of a main part.

FIG. 5 is a sectional side view of a main part.

FIG. 6 is a sectional side view of another contact disk.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft rod part 1a Tip 1b Base 2 Disc cutter 3 Rise pipe 4 Driver 5 Abutment disk 5a One surface 6 Set screw 6a Tip 7 Spiral groove 7a Groove bottom 8 Screw hole 14 Screw 17 Ring bulge L Shaft

Claims (3)

[Claims] 1. A shaft rod 1 having a disk cutter 2 mounted concentrically with an axis L at a tip 1a thereof, the axis 1 being driven by a driving machine 4 connected to a base end 1b thereof. In a rising pipe cutting tip tool that rotates about L and cuts the rising pipe 3 from the inside, a contact disk 5 externally fitted to the shaft rod portion 1 is provided.
And a set screw 6 to be screwed into a screw hole 8 correspondingly penetrating from the outer peripheral surface of the disk 5 to the inner peripheral surface thereof. A helical groove 7 in the opposite direction is provided from the base end 1b side to the tip end 1a side of the shaft rod portion 1, and the tip end 6a of the set screw 6 is connected to the contact disk 5
The abutment disk 5 is fixed to the axle bar portion 1 by projecting from the inner peripheral surface of the axle and pressing against the groove bottom 7a of the spiral groove 7 of the axle bar portion 1, and the disk of the abutment disk 5 A rising pipe cutting tip tool, wherein the rising pipe 3 is cut while the one surface 5a of the cutter 2 is in contact with the opening end face of the rising pipe 3. 2. The upright cutting tool according to claim 1, wherein an annular bulge portion 17 is provided on one surface 5a of the abutment disk 5 along an outer peripheral edge thereof. 3. The cutting tool according to claim 1, wherein the disk cutter 2 is screwed to the surface 1a of the shaft 1 from the direction of the axis L of the shaft 1. .