JPS6114813A - Drilling method and its device of slit in plastic drainage pipe - Google Patents

Abstract

PURPOSE:To form a slit in a pipe while moving it in an axial direction by using a drill which is a for ironwork end mill or rotary bar or the like having cutting ability in its point end and periphery, instead of a circular saw or a high speed cutting wheel. CONSTITUTION:A pipe 1 is fixed to a bed 2 placed on a sliding base 3. If the sliding base is moved, the pipe 1 also moves in an axial direction. The bottom of bed 2 comprises three surfaces such as a horizontal surface in the central part and 2 symmetrically sloped surfaces in both sides. The pipe 1 is penetrated by a drill 8 and formed the slit while moving in the axial direction. Accordingly, the slit can be prevented from clogging by tilting the bed 2 so as to widely machine the inner sides of the slit.

Description

Detailed Description of the Invention This invention involves drilling a hole in a plastic pipe to use as a water collection pipe, and then inserting a drill such as an end mill for ironwork or a rotary bar, which has a cutting ability at the tip and periphery, into the pipe. The present invention relates to a method for drilling elongated holes, so-called slits, by movement in the axial direction, and a drilling device therefor.

Traditionally, slits were made in plastic pipes by pressing a circular saw or high-speed cutting wheel against the pipe. That is, this is a method of drilling a slit by marking the slit position on the pipe in advance and pressing a disc-shaped cutting blade (circular saw, cutting wheel) onto the pipe to cut it.

This drilling method has the disadvantage that uncut ends are inevitably left at both ends of the slit because the cutting blade is circular. Another disadvantage is that the width of the slit to be drilled can only be the same at the entrance (on the surface of the pipe) and the exit (on the inside of the pipe).

This invention was made to eliminate these drawbacks, and to explain it with reference to the drawings, a pipe 1 is fixed to a stand 2 placed on a slide base 3. If you move the slide base 3, the pipe will move 1 degree in the same way.

Attach caps 4 to both ends of pipe 1. The cap 4 is provided with a fulcrum rod 6 centered on the upper surface of the pipe 1 and a bolt 7 for pressing and fixing the pipe 1 against the upper surface.

When both of the fulcrum rods 6 are held between the two struts 5 attached to the slide base 3, the pipe 1 fixed to the stand 2 appears to be hanging from the upper surface of both ends as fulcrums.

As shown in FIG. 2, the base 2 has three bottom surfaces, and the central surface is horizontal. Its two sides are inclined at the same angle.

Even if the stand 2 is moved like a pendulum together with the pipe 1 and both inclined surfaces are attached to the slide base 3 alternately as shown in FIGS. 3 and 4, when viewed in plan, the center of both fulcrum rods 6 The line connecting them does not move.

The drill 8 is placed on this line. Therefore, the structure is such that the drill 8 can penetrate into the same part of the pipe 1 regardless of which of the three bottom surfaces of the stand 2 the slide base 31 is attached to.

Therefore, as shown in FIG.
The pipe 1 is moved a predetermined length in the direction of its central axis while maintaining its shape. When the movement is finished, remove the drill, move the pipe 1 in the same way as the previous one, bring the next drilling position below the drill 8, and insert the drill 8. By repeating this operation, a slit can be made in the pipe 1. The slit in this case has the same width at the entrance and exit.

Furthermore, if the pipe 1 is moved in a pendulum-like motion other than in the axial direction, using the upper surfaces of both ends of the pipe 1 as fulcrums to angle the drill penetration, the opening of the slit will widen toward the center of the pipe. be able to. That is, as shown in FIG. 3, one of the inclined surfaces of the stand 2 is attached to the slide base 3, the drill 8 is inserted, the pipe 1 is moved a predetermined length in the direction of the central axis, and the drill 8 is removed. Pipe 1 again
Move to bring the next drilling position below drill 8 and insert drill 8. After repeating this operation and completing the predetermined number of holes, move the stand 2 like a pendulum and attach the other inclined surface to the slide base 3, as shown in Figure 4, and drill 8 into the hole drilled earlier. If you move the pipe 1 in a tracing motion, you can make a slit that is wider at the outlet than at the inlet.

In this way, two types of slits can be made, and both ends of the slits are semicircular and have no uncut edges, giving a good appearance.

The slit, whose opening gradually widens toward the center of the pipe, can prevent pebbles from getting stuck in the slit, thereby reducing clogging.

The number of slits in one pipe is not constant, but for a pipe with a diameter of 150 to 200 mm, there are approximately 12 slits in each row of approximately 150 mm in length, and 120 in 10 rows, but 4 ~5 drill bodies can be controlled simultaneously to drill all slits relatively quickly.

[Brief explanation of drawings]

Fig. 1 is a front view showing the device of the present invention Fig. 2 is a sectional view taken along line A-A' in Fig. 1 Fig. 3 is a side view showing the function of the stand 2 Fig. 4 is a view showing the function of the stand 2 Side view FIG. 5 is an enlarged front view of the cap 4 and support column 5 FIG. 6 is a side view of the support column 5 FIG.
...Base 3 ...Slide base 4 ...Cap 5 ...Strut 6 ...Fullin rod 7 ...Bolt 8 ... Hiromitsu Utsunomiya on drill patent patent

Claims (2)

[Claims] (1) In the production of plastic water collection pipes, a drilling method characterized by piercing a pipe 1 with a drill 8 and moving the pipe 1 in the direction of its central axis while holding the drill 8 as it is to drill a slit. (2) In a device for making slits in plastic pipes, supports 5 are attached to both ends of the top of a slide base 3 on which a stand 2 with a three-sided bottom is mounted. This drilling device is characterized in that each of the pillars 5 grips a fulcrum rod 6 of a cap 4, and a drill 8 is placed on the center line of both fulcrum rods 6.