JP2006247373A - Pipe cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe cutter which can cut a plurality of kinds of pipes different in diameter so that the cut surface is made perpendicula. <P>SOLUTION: This piper cutter has an opening/closing pipe cutting part 1 and t holding part 1b to open/close the pipe cutting part. The pipe cutter is equipped with a plurality of steps of pipe holding part 2 with at least similar to outer shapes of a plurality of kinds of pipes along the pipe cutting part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a new pipe cutting tool.

  In recent years, polybutene pipes and cross-linked polyethylene pipes (hereinafter simply referred to as pipes) have been used favorably for water supply and hot water supply in apartment buildings, detached houses, and office buildings. Piping systems that connect by connecting to joints such as equipment and headers are adopted.

  If it is at the cutting tip of such a pipe and it is not a cutting tip perpendicular to the longitudinal direction of the pipe, it will be illusioned that the insertion has been completed in an incomplete state when inserted into the joint. As a result, incomplete contact occurs between the O-ring and the pipe holding link built in the joint. In particular, for an O-ring, since the substantial distance between the O-ring (water stop) and the pipe tip is shortened, water stop reliability may be reduced. When passing, the O-ring may be pushed non-uniformly and may move out of the ring house.

  For this reason, the present applicant has already provided a tool for cutting a cut end portion of a pipe at a right angle (Patent Document 1). That is, a pipe cutting part that opens and closes and a gripping part for opening and closing the pipe cutting part, and a pipe holding part that approximates the outer shape of the pipe along with the pipe cutting part. The tip can be cut at a right angle.

JP-A-5-111586

  In the cutting tools mentioned here, the pipe holder has a semi-circular shape that is determined according to the larger pipe diameter of the pipe to be cut so that a large number of pipes can be cut with a single tool. There was actually an arc shape of about 40 mm. In addition, the pipe holding part was present about 9 mm on both sides of the cutter.

  In the cutting tool having such a structure, since the circular diameter of the pipe holding portion is large, especially when trying to cut a pipe having a fine diameter, the pipe is not sufficiently held, and the pipe moves or becomes inclined at the time of cutting. In many cases, the cut surface is cut obliquely because it is cut in a state. In particular, when trying to cut a pipe having a bent wrinkle, it was difficult to cut the cut surface at a right angle.

  A plurality of types of pipes (for example, pipe diameters 10A, 13A, 16A, 20A, etc.) tend to be used at the installation site of pipes, and all of them need to be cut to a desired length. However, since it is necessary to cut the cutting tip at a right angle in any pipe, it is necessary to carry a plurality of cutting tools having different pipe holding portion shapes even when the above-described conventional cutting tool is employed.

  An object of the present invention is to provide an improved tool for cutting a conventionally proposed cutting tool and to provide a tool capable of cutting a plurality of types of pipes at a right angle with a single cutting tool. is there.

  The gist of the present invention is a pipe cutting tool provided with a pipe cutting part that opens and closes and a grip part for opening and closing the pipe cutting part, and approximates at least a plurality of types of pipe outer shapes along with the pipe cutting part The present invention relates to a pipe cutting tool including a plurality of stages of pipe holding portions.

  According to the present invention, it is possible to cut a plurality of pipes with a single cutting tool, and the cutting tip is cut at a right angle, which is particularly remarkable in improving workability at work sites such as piping. There is an effect.

  The greatest feature of the present invention is that the pipe holding portion in the cutting tool corresponds to the outer shape of the number of pipes, and it is possible to cut a plurality of pipes with a single cutting tool. It is.

  The pipe holding part is preferably provided on both sides of the pipe cutting part, but may be provided on one side in some cases.

  And the length of the pipe holding part in the direction substantially orthogonal to the tooth surface of the pipe cutting part on at least one side has a length of 8 mm or more, preferably the entire length of the pipe holding part Is 11 to 100 mm. If the length is less than this, there are cases where the pipe is bent while being bent, while if the length is longer than this, the pipe can be held sufficiently, for example, when the pipe is bent, and the cut surface has a right angle. There are cases where this is not possible.

  Hereinafter, the present invention will be described in more detail with reference to examples. FIG. 1 is a perspective view of a pipe cutting tool of the present invention, FIG. 2 is a side view when cutting a pipe having a small diameter, and FIG. 3 is a top view thereof. FIG. 4 is a side view when cutting a pipe having a large diameter, and FIG. 5 is a top view thereof.

  In the figure, reference numeral 1 denotes a pipe cutting part, which includes a cutter 1a. 1b is a gripping part, and by grasping this, the cutter 1a opens and closes up and down across the shaft 1c to cut the pipe. This cutter 1a is replaceably mounted on the gripping portion 1ba side. On the other hand, on the holding part 1bb side, the pipe holding parts 2 are mounted on both sides corresponding to the cutter 1a. The pipe holding part 2 includes a flange 2a for fixing to the gripping parts 1ba and 1bb and an arc part 2b for supporting the outer periphery of the pipe.

  The length of the pipe holding portion 2, that is, the total length of the two arc portions 2b holding the pipe in the direction orthogonal to the cutter-1a of the pipe cutting portion 1 is 20 mm in this example. If this length is within 8 to 50 mm (10 to 100 mm in total length) on one side of the arc portion 2b, preferably 10 mm or more on one side (18 to 50 mm in total length), cutting is performed as planned.

  The arc portion 2b can sufficiently exhibit the accuracy of pipe cutting. However, as shown in FIG. 6, when the arc portion 2b on one side is set to a length suitable for holding the pipe as described above, If the arc portion 2c is provided at 3 mm or more, it is easy to cut the pipe and it is easy to form the cut surface at a right angle, so it goes without saying that a more preferable embodiment is provided if the pipe holding portions are provided on both sides.

  The greatest feature of the present invention is that the arc portion 2b sandwiching such a pipe is a multi-stage holding portion that approximates the outer shape of a plurality of types of pipes. In this example, the JIS K 6778 (polybutene pipe) is used. An arc portion 2ba (diameter 23 mm) with respect to the specified nominal diameter 16 (outer diameter 22 mm) is formed, and an arc portion 2ba (diameter 18 mm) with respect to the nominal diameter 13 (outer diameter 17 mm) is formed at the center. .

  The pipe cutting tool is used as shown in FIGS. 2 to 5. In order to cut a polybutene pipe having a nominal diameter of 13, the pipe Pl is further recessed in the center of the arc portion 2ba. The pipe Pl is supported at a right angle with respect to the cutter 1a by gripping the gripping portion 1b and is cut in this state, and the cutting tip of the pipe Pl can be cut at a right angle with respect to the longitudinal direction of the pipe. Is.

  On the other hand, the cutting of the pipe P2 having the nominal diameter 16 is cut in the same manner after being placed in the arc portion 2ba, and the cutting tip can be cut at a right angle. When the pipe P2 is gripped, there is a gap between the circular arc part 2bb, but this is a space that is not involved in cutting at all, and there is no influence.

  The present invention is as described above, and it is possible to cut pipes with different diameters with a single tool, and the cutting tip can be cut at right angles. It has become extremely convenient for the work, and its utility value is extremely high.

FIG. 1 is a perspective view of a pipe cutting tool of the present invention. FIG. 2 is a side view at the time of cutting a small-diameter pipe with a pipe cutting tool. FIG. 3 is a top view at the time of cutting in FIG. FIG. 4 is a side view when a large-diameter pipe is cut by a pipe cutting tool. FIG. 5 is a top view at the time of cutting in FIG. FIG. 6 is a top view showing another example of the pipe cutting tool of the present invention.

Explanation of symbols

1. Pipe cutting part,
1a: Cutter,
1b, 1ba, 1bb ... gripping part,
1c axis,
2. Pipe holding part
2a ... Flange
2b, 2ba, 2bb, 2c ... arc portion,
P1, P2 pipes.

Claims (5)

  A pipe cutting tool provided with a pipe cutting part that opens and closes and a grip part for opening and closing the pipe cutting part, and a plurality of stages of pipe holding parts approximating at least a plurality of types of pipes along with the pipe cutting part A pipe cutting tool characterized by comprising:   The pipe cutting tool according to claim 1, wherein a length of the pipe holding portion in a direction substantially orthogonal to a tooth surface of the pipe cutting portion on at least one side has a length of 8 mm or more.   The pipe cutting tool according to claim 1, wherein the entire length of the pipe holding portion is 11 to 100 mm.   The pipe cutting tool according to claim 1 or 2, wherein the pipe holding part is provided on one side of the pipe cutting part.   The pipe cutting tool according to claim 1 or 2, wherein the pipe holding part is provided on both sides of the pipe cutting part.

Images