JPS588471Y2 - Drain pipe cutter for attaching drainage hardware - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cutter for cutting synthetic resin type drain pipes buried in concrete floors of buildings in order to attach drainage fittings.

Usually, in buildings and buildings with reinforced steel structures, there is a kitchen area,
For drains installed on the floor of washrooms, toilets, etc., synthetic resin type drain pipes are constructed under the floor surface and are buried in advance so as to protrude above the concrete floor surface when the concrete floor surface is constructed. It is designed to facilitate construction and to prevent drainage holes from clogging and becoming unusable due to various construction works.

When installing drainage hardware such as drainage traps,
Smash the concrete around the drainage pipe that is constructed to protrude above the floor surface, dig it down to the required depth, cut the drain pipe with a saw at a predetermined dimensional position under the floor surface, apply adhesive to the drainage hardware, and install the drainage pipe. It was installed by closely fitting the top surface, but such cutting work required a very large excavation to be made around the buried drain pipe so that it could be sawed.
It requires a lot of labor and time, and additional labor is also required for subsequent finishing such as cement filling and tiling, which has the disadvantage of poor work efficiency.

In view of these points, this proposal is based on the following: When installing drainage hardware on a drain pipe built to protrude above the floor surface, when cutting the synthetic resin type drain pipe at a predetermined depth below the floor surface, To provide a cutter that can cut from the inside of a pipe to a desired depth below the floor surface without the need to excavate a large amount of concrete around a drain pipe and expose it, thereby simplifying and simplifying work for attaching drainage hardware. This is the purpose of this invention, and the main idea will be explained below with reference to the drawings.

A metal disc 2 with a diameter of about 120 mm and a boss 1 in the center has circular holes 3 concentrically spaced at 120° intervals from the center.
and a radial elongated hole 4 between them, and each elongated hole 4 has a handle 6 rotatably mounted on a shaft over a bearing portion 5 formed at the outer end of the elongated hole and a boss 1. A base plate 8 is provided with a stopper 7 that is slidable in the radial direction by rotation of a screw rod 6 attached to the base plate 8. A stop ring 11 that can be freely measured is fitted onto the tube shaft 9 with a set screw 10 above it, and the lower end of the tube shaft 9 has a square hole 12 in the center and mounting recesses on three sides of the outer circumference. A support plate 14 having a groove 13 is integrally provided, and the upper end root of a knife rod 16 having a square cross section and having a blade 15 with its lower end protruding outward is pivoted by a pivot 17 in each mounting recess 13 of the support plate. At the lower end of the square shaft 19, which is longer than the tube shaft 9 and has a threaded portion 18 in its upper half, there are engagements at three locations around the radial direction of the three knife rods. A cutting diameter adjustment plate 21 made of a disc with a mating recess 20 is fixedly installed, and the square shaft 19 is inserted and projected upward through the square hole 12 at the center of the support plate 14 and the tube shaft 9, It has a structure in which a wing nut 22 is screwed onto the threaded portion 18 at the top thereof, and a rotating handle 24 having a handle portion 23 that can be screwed up to the surface of the square shaft 19 at the upper end of the tube shaft 9 is attached.

This project has the above-mentioned configuration, and as shown in Figure 4, a synthetic resin drain pipe port for drainage, which has been buried in a predetermined dimension protruding from the concrete floor surface of the building, is equipped with a drainage trap, etc. When installing hardware, dig around the drain pipe to the extent of the outside diameter of the drainage hardware, press down the cutting diameter adjusting plate 21 via the square shaft 19 according to the inner diameter of the drain pipe opening, and then remove the cutting tool. Shrink the outer diameter of the cutting edge of the rod 16 to form the tube shaft 9.
The stop ring 11 is moved up and down according to the planned cutting depth from the floor surface A to be cut, and the base plate 8 is fixed to the pipe shaft 9 with the setscrew 10, and the base plate 8 is placed at the upper end of the drain pipe opening. Place it on the
In order to position the square shaft 19 and the pipe shaft 9 at the center of the drain pipe opening, when the screw rod 6 with each handle 6' is rotated, each stop 7
advances toward the outside in the radial direction and comes into contact with the inner surface of the drain pipe opening, and at this time the drain pipe opening and the center of the square shaft 19 are aligned. The base plate 8 can be easily fixed and centered by tightening the stopper 7 of the terminal rod 6 with a handle so that the outer diameter of the drain pipe is uniformly expressed in the round hole 3.

Next, when the wing nut 22 is rotated, the square shaft 19 screwed thereon and the cutting diameter adjustment plate 21 rise, so that each of the blades engaged in the engagement recesses 20 on three sides of the adjustment plate rises. The rod 16 expands outward with the pivot 17 of the support plate 14 as a fulcrum, and each blade 15 bites into the inner surface of the drain pipe opening, and when the rotating handle 24 is rotated, the three blades 15 open the drain pipe opening. As the cutting begins from the inside, the blade 15 further spreads outward by tightening the wing nut 22 slightly and raising the square shaft 19 and cutting diameter adjustment plate 21 to perform cutting action, and the drain pipe opening is cut from the inside. Usually, there is a covering made of paper or the like wrapped around a buried drain pipe opening, so it can be cut without damaging the cutting edge with concrete.

When the cutting is completed, remove the cut pipe upwards, and attach a short pipe part 2 for connecting to a drainage hardware such as a drain trap to the cut end of the drain pipe opening, as shown by the dotted line, and apply adhesive on the upper part of the surrounding area. It is applied, fitted and fixed, and the installation work to the drainage hardware is completed at the same level or slightly lower than the floor surface, and the surrounding gap is filled with cement, mortar, etc., and it can be attached even after tiling work.

In addition, with this cutter, by loosening the wing nut 22, pushing the square shaft 19 downward, and lowering the blade cutting diameter adjustment plate 21 to the lower end, the blade rod 16 can be adjusted.
Since the terminal rod 17 contracts inwardly using the pivot 17 as a fulcrum, if the terminal rod 6 with a handle is turned and the stopper 7 is advanced inwardly, it can be pulled upward together with the base plate 8.

According to the present invention having the above-mentioned configuration, the tube shaft is inserted into a buried synthetic resin drainage pipe that protrudes above the floor surface, and the plywood is fixed to the upper end of the pipe via a stopper by rotating a terminal rod with a handle. By tightening the wing nut, widening the knife rod, and rotating the rotary handle, it is possible to easily and accurately cut the drain pipe to any desired depth at right angles for attaching drainage hardware. Not only can you easily adjust the cutting depth by adjusting the position of the stop ring according to the installation depth and height of the hardware, but also the size of the drain pipe diameter (usually 40 to 75 mmφ)
Regardless of the area, it can be cut from the inside by operating from above the floor surface, and there is no need to break up the surrounding concrete floor into large pieces that can be sawed and dig up the surrounding concrete floor as in the conventional method, making it easier to install drainage hardware. The labor and time required for construction can be greatly reduced, the work can be carried out efficiently, and the construction period can be shortened.

In addition, it has the advantage of being lightweight and extremely convenient to carry and handle.

[Brief explanation of the drawing]

FIG. 1 is a front view of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a cross-sectional plan view taken along line A-B in FIG. 1, and FIG. 4 is a sectional view showing the state of use of the present invention. 1...Boss, 2...Disc, 3...
...Circular hole, 4...Long hole, 6...Terminal rod with handle, 7...Fall, 8...Base plate, 9
...Pipe shaft, 11 ... Stop ring, 12 ...
... Square hole, 14 ... Support plate, 15 ...
・Blade, 16...Knife rod, 18...Screw part, 19...Square shaft, 20...Engagement recess, 21... ...Blade cutting diameter adjustment plate, 22... Wing nut, 24... Rotating handle.

Claims (1)

[Scope of utility model registration request] A tube shaft 9 of a predetermined length is fitted into the boss 1 at the center of the disk 2, and circular holes 3 and radial elongated holes 4 are formed by dividing the disk 2 at equal distances from the center. At least three holes are provided, and each elongated hole 4 is provided with a stop 7 that is slidable in the radial direction by a screw rod 6 with a handle that is rotatably mounted on the shaft, and a base plate 8 that can be centered and fixed to the upper end of the drain pipe. , the tube shaft 9 is suspended above the boss 1 with a stop ring 11 provided on the upper part thereof so as to be adjustable up and down, and has blades 15 at the lower ends on three sides of the support plate 14 provided at the lower end of the tube shaft 9. 16, and has an engagement recess 20 at the lower end of a square shaft 19 that penetrates the square hole 12 at the center of the support plate 14 and the tube shaft 9, for undulating each of the knife rods 16 in the radial direction. A diameter adjustment plate 21 is fixedly installed, and a wing nut 22 that contacts the upper end of the tube shaft is screwed into the threaded portion 18 cut in the upper half of the square shaft 19, and the tube shaft 9
A drain pipe cutter for attaching drainage hardware, comprising a rotary handle 24 at the upper end of the drain pipe.