JP2003340625A - Drilling cutter for resin pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure which can extremely easily remove chips from a cutter after finishing a cutting operation without disturbing cutting workability for a resin pipe. <P>SOLUTION: The drilling cutter for the resin pipe is composed of a substantially cylindrical guide having a cutout over the whole length in the longitudinal direction, a cutter having a cutting edge arranged at the tip of the guide, and a cover which slides on the outer periphery of the cutter. The cutter can be connected to the cover by screws. When the cutter has been connected to the cover by screws, the cutting edge is exposed from the tip of the cover. The root side of the guide is closed and provided with an attachment for a rotational mechanism. The cutout angle of the cutout is nearly 180°. The tip side of the cutter is wider than the inside diameter of the cover, and taperingly expands. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of reliably and efficiently piercing a resin pipe such as polyethylene which has been widely used recently in water pipes and the like, and is capable of easily removing cut chips from an instrument. It relates to the structure of a cutter that can be used.

[0002]

As a water pipe used for water supply, conventional metal pipes are replaced with resin pipes such as polyethylene because of their poor workability and electric corrosion. is there. In order to use this resin pipe as a water pipe, it is necessary to attach a water faucet typified by a saddle water faucet at an appropriate position for attaching the branch pipe. That is, it is necessary to drill water diversion holes in the resin pipe with a drill or a cutter.

As means for realizing this, Japanese Patent Publication No. 277458 of 1999 and Japanese Patent Publication No. 277498 of 1999 are known as known techniques for perforating the resin pipe. . In this technology, the hole for drilling is cut along the diameter of the hole while rotating the hole for drilling from the surface side of the resin pipe, but when the drilling is completed, the cutting chips and the periphery are cut into a cylindrical shape with a screw shape. Large pieces of chips (cutting powder) are clogged tightly. So, to remove this, remove the shank from the Horso, screw the screw part of the pushing tool into the screw hole of the Horso,
The work of pushing in the push-out tool is required. However, the device adopted in this configuration is one in which the Horso and the shank are separated as a separate body for the purpose of removing the cutting powder, and the innermost side of the cutting powder is exposed. Since the powder is densely buried in the deep hole, a dedicated extruding tool for removing this is required. Therefore, since the whole is composed of a plurality of separated parts, it is difficult to manage the parts, and at the same time, there is a problem that assembly and disassembly are required in the field work. Further, since the cutting powder is densely packed in the hollow portion of the Horso, it is necessary to apply a considerable force when pushing out with the pushing tool, which makes the work troublesome.

The present invention focuses on the problem of the number of parts and the improvement of workability in the above-mentioned conventional technique.
Disclosed is a configuration in which chips can be extremely easily removed from a cutter after cutting is completed without impairing the cutting workability of a resin pipe.

[0005]

In order to achieve the above-mentioned object, according to the present invention, a substantially cylindrical guide portion having a slit in the entire length direction and a cutting edge provided at the tip of the guide portion are provided. A blade with and has been adopted. Then, a cover that slides around the outer periphery of the blade is applied, and the blade and the cover can be screwed with each other by a screw, and when screwed as described above, the edge is exposed from the tip of the cover. I was there. Here, the edge cuts the resin pipe at the part exposed from the cover, but the linear chips generated by the cutting and the large columnar chips resulting from this cutting are the cover and the guide part. Cutting proceeds while being housed in the space created by. When the cutting is completed, the screwing of the blade and the cover is released, and the cover is slid to visually confirm the chips contained in the guide portion through the slit. Since the cuts are present over the entire length of the guide portion, the tips of the cutting chips are also exposed and can be easily removed.

As a more concrete means, a means was adopted in which the base side of the guide portion was closed and a mounting portion for the rotating mechanism was provided at this portion, but the mounting portion was fixed to the electric rotating mechanism. In some cases, strong torque is used for cutting.

Furthermore, a means for setting the split angle of the slit provided in the guide portion to approximately 180 degrees was also used. If the split angle of the slit of the guide part is made smaller, the chips will not easily fall off, but will be difficult to remove. On the contrary, if the split angle is increased, it is easy to remove, but it is easy to fall off. The split angle is set in consideration of these. This means about 18
0 degree is not limited to the range of error, and means that the split angle includes both closed and open straight lines.

As a specific means on the tip end side of the blade, a configuration is adopted in which the blade is widened wider than the inner diameter of the cover. In this means, since the tapered portion interferes with the cover, it functions as a contact surface when the cover is screwed onto the blade as well as preventing the cover from falling off.

Further, a means has been adopted in which a cylindrical bar is integrally provided on the base side of the cutting tool, and a mounting portion is provided on the base side of the bar. In this means, the bar has a function of ensuring a length for avoiding the interference of the blade and the cover with the complicated rotating mechanism. Further, the bar in which a portion having a slidable outer diameter and a portion having an outer diameter larger than the inner diameter of the cover are connected by a step has a function of preventing the cover from falling off from the base side.

[0010]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partial cross-sectional view of a cutter shown as an example. The cutter 1 is a cylindrical and solid bar 2, a substantially semi-cylindrical blade 3 extended from the bar 2 and integrally attached, and the blade 1. It is composed of three members, which are a cylindrical cover 4 slidably provided around the circumference of the cover 3. Screws 5 and 6 are respectively cut on the interface between the blade 3 and the bar 2 and on the inner periphery of the base side of the cover 4, and by screwing the screws together, a substantially semi-cylindrical portion of the blade 3 is covered by the cover 4, Only the edge 7 provided at the tip of the blade 3 is exposed. As shown in FIG. 2, a more specific structure of the blade 3 includes a semi-cylindrical guide portion 8, a circumferential groove 9 provided on the inner circumference near the tip of the guide portion, and an edge 7. . Edge 7 is
In consideration of the properties of the resin pipe that is the object to be cut, it is assumed that the chips have a sharp structure so that the chips do not become thick, and that many linear chips do not appear as a single blade. However, since the present invention does not place importance on the specific configuration of the edge 7 itself, even if there are a plurality of edges, it does not depart from the scope of the invention. The edge 7 is tapered so as to be wider than the diameter of the semi-cylindrical guide portion 8, and the cover 4 has an inner diameter slightly larger than the outer diameter of the guide portion 8. Tip 4a
Will not fall out as a result of interfering with edge 7.

The bar 2 has a tip side 2c which is reduced in diameter from the root side 2a with a step 2b, and the outer diameter of the guide portion 8 is set to be substantially the same as the tip side 2c. Therefore, even when the cover 4 is unscrewed from the blade 3, the base side of the cover 4 collides with the step 2b,
It does not fall to the root side. Further, H is a marked line, which is composed of a recess that appears at the joining boundary between the bar 2 and the blade 3, and when the rear end of the cover 4 reaches the marked line H, the screw 5
It is a guide for visually recognizing that the cover 4 is freely slid so that the screwing of 6 is released. 1
Reference numeral 0 denotes a male screw provided on the base side of the bar 2, which is used as a mounting portion when the cutter 1 is separately mounted to the rotating mechanism. However, the structure for fixing need not be limited to the male screw 10 and may be fixed by a chuck mechanism or a square shaft. 3 is a perspective view of the main part of the cutter 1, showing a state where the cover 4 is removed and slid to the base side. By the way, the bar 2 in the present embodiment is shown as having a considerable length in the drawings, but the essential function of the bar in the present invention is to reliably rotate the blade 3 and the cover 4. The length of the bar is important as a part for applying a force to the object to be cut. For example, when the screw 10 is attached to the rotating mechanism and the rotating mechanism does not interfere with the object to be cut during cutting, the length of the bar is important. It cannot be an element. In other words, as shown in FIG. 4, it is possible to directly provide the angular shaft 11 on the root side of the guide portion 8 of the blade 3 and fix the angular shaft 11 to the rotating mechanism. However, in this case, cover 4
The removal prevention when the blade is removed from the blade 3 is omitted. It goes without saying that the square shaft 11 may be replaced with a male screw or a chuck mechanism.

FIG. 5 shows the split angle of the guide portion 8 of the cutting tool 3. In the present embodiment, the split angle (the angle of the portion cut from the cylinder) is set to slightly less than 180 degrees. In other words, the guide portion 8 has an angle slightly larger than 180 degrees. The reason for setting the angle in this way is as follows. That is, when the split angle is set to be small and the actual angle of the guide portion 8 is set to be large, the chips contained in the guide portion after the completion of cutting are maintained with a strong holding force. Even when 1 is pulled out from the resin pipe, the chips do not fall inside the resin pipe. However, when the chips are removed from the guide portion 8, they cannot be easily removed because of the strong holding force. On the other hand, when the split angle is increased and the actual angle of the guide portion 8 is set to be small, the friction resistance is small and thus the cutting is easy, but when the cutter 1 is pulled out from the resin pipe after cutting, the holding force is reduced. Since it is weak, chips may fall inside the resin pipe. In order to solve these conflicting requirements at the same time, the split angle is set to slightly less than 180 degrees to set the actual angle of the guide part so that it will not easily fall off even when the cutter 1 is removed from the resin pipe after cutting. The work of removing chips can be easily done with a finger or the like. Note that the split angle is not strictly limited to a numerical value, and can be appropriately adjusted within a range in which the two conflicting requirements described above can be simultaneously solved.

Next, a procedure for punching a resin pipe using the cutter 1 of this embodiment will be described. First, in the cutter immediately before punching, the screw 5 provided on the cover 4 is securely screwed into the screw 5 provided on the blade 3, and only the edge 7 of the blade 3 is set to be exposed from the cover 4. After that, the resin pipe is fixed to the rotating mechanism by the male screw 10, and the resin pipe is cut from the outer circumference toward the inner circumference while rotating the cutter. In cutting, linear chips directly cut by the edge 7 and large chips separated from the resin pipe by the linear chips are gradually accommodated in the cavity formed by the guide portion 8 and the cover 4 at the same time. . Then, when the cutting is completed, the rotation of the cutter is stopped and the cutter is pulled out from the resin pipe. In this case, since the linear chips immediately before the completion of cutting are contained in the groove 9, even when the cutter 1 is pulled out from the resin pipe, this part becomes a resistance and the chips easily fall off. do not do. After that, if the cover 4 is removed from the blade 3 and slid toward the root side, the cutting chips are stored in the guide portion 8, and this is removed with a finger or the like. In this way, chips can easily be removed from the device. Therefore, if the device of the present embodiment is used, not only a dedicated device for removing chips is not required,
The cover 4 does not accidentally fall off during work, and there is no need for troublesome parts management.

In this embodiment, the tip of the cover 4 is not particularly touched, but it is also possible to provide a necessary edge on the tip of the cover 4. In this case, the edge 7 provided at the tip of the blade 3 in the above-described embodiment.
Is omitted and the function of only the guide portion 8 is performed. Furthermore, since the groove 9 provided near the tip of the blade 3 is intended to prevent the chips from falling off, if the split angle of the blade 3 is relatively small and the chips can be reliably held. The groove 9 may be omitted.

[0015]

According to the present invention, as this kind of punching cutter, a blade having a substantially cylindrical guide portion having a slit in the entire length in the lengthwise direction, and a cutting edge provided at the tip of the guide portion, The blade and the cover are configured to be slid on the outer circumference, and the blade and the cover can be screwed to each other by screws, and the edges are exposed from the tip of the cover by screwing as described above. The resin pipe can be cut by using this, and after cutting is completed, the cutting chips stored in the guide section are exposed from the slits only by unscrewing the cover, and this requires a separate tool. It can now be easily removed.

Further, since the base side of the guide portion is closed and the mounting portion for the rotating mechanism is provided, a strong torque can be obtained by an electric rotating mechanism or the like. Further, when the split angle of the slit is set to about 180 degrees, the chips can be collected without falling inside the resin pipe, and at the same time, even when the chips are removed, they can be easily detached from the guide portion. Resolve conflicting requests.

Further, in the structure in which the tip side of the blade is expanded in a tapered shape wider than the inner diameter of the cover, the cover will not fall off from the tip side, so that the risk of loss can be avoided. .

Furthermore, since the cylindrical bar is integrally provided on the base side of the blade and the mounting portion is provided on the base side thereof, there is no interference between the rotating mechanism and the blade or the cover.
Since the step is provided in the middle of the bar and the cover has a slidable outer diameter and a portion having an outer diameter larger than the inner diameter of the cover, the cover does not fall off from the base side. The management of the equipment on site has become extremely easy.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an example of a punch cutter of the present invention.

FIG. 2 is a perspective view showing a blade portion of the same.

FIG. 3 is a perspective view showing a main part of the same.

FIG. 4 is a partial cross-sectional view showing another embodiment.

FIG. 5 is a schematic view showing an example of a cutting angle of a blade.

[Explanation of symbols]

1 cutter 2 bars 3 cutlery 4 cover 5, 6 screws 7 Edge 8 Guide section 9 grooves 10 male screw 11 Square axis

Claims (6)

[Claims] 1. A cutter for perforating a resin pipe of polyethylene or the like, which has a substantially cylindrical guide portion having a slit in the entire length in the lengthwise direction, and a cutting edge provided at the tip of the guide portion. And a cover that slides around the outer periphery of the blade, wherein the blade and the cover can be screwed together by a screw, and when the screw is engaged, the edge is exposed from the tip of the cover. Perforating cutter for resin pipes. 2. The punching cutter for a resin pipe according to claim 1, wherein a root side of the guide portion is closed, and a mounting portion for the rotating mechanism is further provided. 3. The resin pipe piercing cutter according to claim 1, wherein the split angle of the slit is approximately 180 degrees. 4. A perforating cutter for resin pipes according to claim 1, wherein the tip end side of the blade is widened in a tapered shape wider than the inner diameter of the cover. 5. A resin pipe piercing cutter according to claim 1, wherein a cylindrical bar is integrally provided on the base side of the blade, and a mounting portion is provided on the base side of the bar. 6. The punching cutter for a resin pipe according to claim 5, wherein the bar has a portion having an outer diameter with which the cover can slide and a portion having an outer diameter larger than the inner diameter of the cover are continuous by a step.