JP3235903U - Cutting jig for making elbow covers - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting jig for making an elbow cover, which can easily and quickly cut out a segment constituting an elbow cover from a cylindrical pipe cover without requiring a skill level of an operator.
SOLUTION: A saw groove 13a, 13b, 14a, 14b which is a cutting guide is provided on two opposite side plates 11 and 12, and a cutting tool to be passed between both side plates is moved along the saw groove between the side plates. A cutting jig 1 for making an elbow cover for cutting the cylindrical pipe cover 2 set in the saw groove is a set of saws having a positive predetermined angle in the horizontal direction with respect to the perpendicular plane of the longitudinal central axis of the side plate. A position mark 16a, which is composed of grooves 13a and 13b and a set of saw grooves 14a and 14b having a negative inclination of a predetermined angle, and further, which is attached to a side plate and indicates a position where the tip of a cylindrical pipe cover is set. 16b and a fixture having a fixing flat plate 17 suspended from above in the direction perpendicular to the bottom plate 15 are provided.
[Selection diagram] Fig. 1

Description

The present invention relates to a cutting jig for cutting out a curved member covering an elbow from a cylindrical pipe cover.

Conventionally, glass wool or styrofoam pipe covers have been used to cover air-conditioning pipes and water and sewage pipes for heat insulation. In particular, as a method for manufacturing a curved member to be attached to an elbow, for example, there is one described in Patent Document 1.

FIG. 6 (a) is a diagram illustrating a conventional method for manufacturing a heat insulating material for a pipe bent portion described in Patent Document 1, and as shown in FIG. 6 (b), is covered with the pipe bent portion heat insulating material. Covers the bent portion of a pipe having a bending angle α, a radius of curvature R of bending, and an outer diameter d with a cylindrical heat insulating covering material having an inner diameter d and a wall thickness e.

That is, in the method of processing the cylindrical covering material, first, the cylindrical covering material is cut on a substantially flat surface that is inclined to a surface passing through the axis of the covering material, and each cutting plane is covered. An angle of + β and −β is provided with respect to a cross section perpendicular to the axis of the material, thus satisfying the relationship β = α / (2n + 2), and the long generatrix b of the obtained covering material portion is b = 2. It is assembled so as to satisfy the relationship of (R + d / 2 + e) and tanβ, and to make an optimum angle by combining the remaining straight line portion and the intermediate prism portion.

However, the manufacturing of the heat insulating material for the bent portion of the pipe in the above-mentioned conventional example is often handmade by a person at the construction site of the pipe, and in particular, as the diameter becomes larger, it is necessary to cut at a more accurate angle and flatness. High skill was required.

On the other hand, conventionally, there has been a jig described in Non-Patent Document 1 as a jig for cutting wood or the like accurately and easily at a predetermined angle.

This product has saw grooves on both sides of the U-shaped facing side plates at positions that line up in a straight line at a predetermined angle, and the wood set between the side plates is passed through both saw grooves along the saw grooves. It was possible to cut wood at a predetermined angle without the need for skill.

Japanese Unexamined Patent Publication No. 5-203097

Page introducing the product name "Miter Box" Internet <URL: http://cumbiasazo.com/grabber414310.html>

However, in order to cut out the pipe bend, that is, the prism for covering the elbow from the cylindrical pipe cover, the number n of prisms is determined from the radius of curvature R of the curve at the work site, and the number of prisms and the pipe bend are determined. It is necessary to calculate the inclination angle β from the bending angle α of, and calculate the bus a and b of the prism from the inclination angle β, the radius of curvature R of the curve, the outer diameter d of the pipe, and the wall thickness d of the pipe cover. After obtaining these, there was a problem that the preparatory work such as marking the cutting line on the cylindrical pipe cover required skill and time.

The present invention has been made to solve the above-mentioned conventional problems, and the purpose thereof is to cut an elbow cover for making an elbow cover from a cylindrical pipe cover without requiring the skill of an operator. To provide a jig.

The cutting jig for creating an elbow cover according to the present invention, which solves the above-mentioned conventional problems, is provided with saw grooves as cutting guides on two facing side plates, and cutting tools are provided on both side plates of the cutting jig for creating an elbow cover. It cuts the cylindrical pipe cover set between the side plates by passing it between them and moving it along the saw groove, and the saw groove has a positive predetermined angle in the horizontal direction with respect to the perpendicular plane of the longitudinal central axis of the side plates. It consists of a set of saw grooves having a It is provided with a fixture having a fixing flat plate suspended from above in the vertical direction.

As a result, the operator can set the tip of the cylindrical pipe cover on the position mark and cut it along the saw groove, so that it is easy to cut without the trouble of marking and the skill of cutting. In addition, it is possible to cut out a trapezoidal segment when viewed in a plane, which constitutes an elbow cover from a cylindrical pipe cover in a short time.

Further, a predetermined angle related to the saw groove of the cutting jig for creating an elbow cover according to the present invention is set according to the bending angle of the elbow and the number of trapezoidal segments seen in a plane constituting the elbow cover. The position mark indicates the position where the tip of the cut surface of the cylindrical pipe cover cut at a predetermined angle is aligned, and the distance from the position mark to the saw groove is the length of the short generatrix and the long generatrix of the segment. Corresponds to at least one of the lengths of the cylindrical pipe cover and was set according to the inner diameter and wall thickness of the cylindrical pipe cover, the radius of curvature of the elbow and the predetermined angle of the saw groove.

As a result, the segment of the corresponding cylindrical pipe cover can be correctly cut out only by changing the position where the tip of the cut surface of the cut cylindrical pipe cover is set according to the difference in the inner diameter of the cylindrical pipe cover. ..

Further, the cylindrical pipe cover set in the cutting jig for creating an elbow cover according to the present invention has a slit penetrating to the internal space in the longitudinal direction, and the fixing flat plate is inserted into the slit of the cylindrical pipe cover. The cylindrical pipe cover is fixed by being inserted.

This prevents the cylindrical pipe cover from rotating in the circumferential direction, so that the cylindrical pipe cover can be cut in an accurate angular plane.

Further, the fixture of the cutting jig for creating an elbow cover according to the present invention suspends the fixing flat plate so as to be slidable in the direction of the side plate.

As a result, the cylindrical pipe cover can be sandwiched between the side plate and the fixing flat plate and fixed, so that the cylindrical pipe cover can be cut at an accurate position and angle.

The elbow cover making cutting jig of the present invention makes it possible to make an elbow cover without requiring skill in making an elbow cover.

It is a perspective view which shows the cutting jig for making an elbow cover which set the cylindrical pipe cover in Embodiment 1 of this invention. (A) Plan view of a cutting jig for making an elbow cover with a cylindrical pipe cover set, (b) Cross-sectional view cut on a plane perpendicular to the bottom surface passing through the central axis of the cylindrical pipe cover, (c) Cylindrical shape. It is a right side view of the cutting jig for making an elbow cover in which a pipe cover is set. (A) is a plan view of the elbow cover according to the first embodiment of the present invention, and (b) is a diagram showing the arrangement of the segments constituting the elbow cover in the cylindrical pipe cover. (A) It is a figure which shows the relationship between the saw groove and a position mark in the present Embodiment 1, and (b) is a figure which shows the relationship between the saw groove of the other side plate and a position mark in this embodiment 2. (A) A plan view of a cutting jig for creating an elbow cover with the cylindrical pipe cover set in the second embodiment of the present invention, (b) a plane passing through the central axis of the cylindrical pipe cover and perpendicular to the bottom surface. It is a cross-sectional view cut in 1 and (c) a right side view of the cutting jig for making the elbow cover. (A) A side view of a main part of a covering material showing a prism portion for forming a required angle, and (b) an explanatory view when the covering material is applied to a bent portion of a pipe.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a perspective view showing a cylindrical pipe cover and a cutting jig for creating an elbow cover according to the first embodiment of the present invention, and FIG. 2A is a cylindrical pipe at a position where a segment is cut out from the cylindrical pipe cover. It is a plan view of the cutting jig for making an elbow cover when the cover is set, and FIG. 2 (b) is a cross-sectional view which passes through the central axis of the cylindrical pipe cover and is cut on a plane perpendicular to the bottom surface. (C) is a right side view of a cutting jig for making an elbow cover in which a cylindrical pipe cover is set.

In FIG. 1, a cylindrical pipe cover 2 is set between the side plates 11 and the side plates 12 of the cutting jig 1 for creating an elbow cover. The cylindrical pipe cover 2 is a cylinder having a cylindrical internal space for accommodating a pipe, and the wall thickness of the covering material thereof is uniform. The cylindrical pipe cover 2 is provided with a slit 21 penetrating to the internal space in the longitudinal direction so that the pipe can be inserted.

The side plate 11 of the cutting jig 1 for creating an elbow cover is provided with saw grooves 13a and 14a, and the side plate 12 is provided with saw grooves 13b and 14b. As shown in FIG. 2A, these saw grooves 13a and 13b, and the saw groove 14a and 14b are cut on virtual straight lines a and b as a set, respectively. The depth reaches the bottom plate 15. Further, the virtual straight lines a and b have positive and negative inclinations in the horizontal direction with respect to the plane perpendicular to the central axis in the longitudinal direction of the side plate 11, and the inclination angle β is the bending angle of the target elbow and the plane constituting the elbow cover. It is determined by the number of segments, which are trapezoidal tubular members.

The position marks 16a and 16b are marks indicating the positions where the tips of the remaining cylindrical pipe covers are set when a segment is created from the remaining cylindrical pipe covers cut out by the saw groove. The position mark 16a is for cutting the cylindrical pipe cover along the saw grooves 13a and 13b, and the position mark 16b is for cutting along the saw grooves 14a and 14b. Details will be described later.

The fixing flat plate 17 is an L-shaped flat plate, and the short side portion is screwed onto the hanging tool 18 and suspended in the direction perpendicular to the bottom plate 15. Then, the fixing flat plate 17 is used by being inserted into the slit 21 of the cylindrical pipe cover 2 as shown in FIG. 2 (c). Therefore, the lowermost end of the fixing flat plate 17 is located above the height of the wall thickness of the cylindrical pipe cover having the maximum diameter targeted by the cutting jig for creating the elbow cover.

Further, the hole for attaching the fixing flat plate of the hanging tool 18 is a long hole, and the fixing flat plate 17 can be slid toward the side plate. Further, the hanging tool 18 is slidable in the longitudinal direction of the side plate, and preferably includes a fastener that can be fixed to the side plate at an arbitrary position.

The fixing flat plate 17 and the hanging tool 18 constitute a fixing tool.

Next, the elbow cover created by using the cutting jig for creating the elbow cover in the present embodiment will be described.

As described in Patent Document 1 described above, the elbow cover consists of trapezoidal tubular segments viewed from a plane obtained by cutting a cylindrical pipe cover on a plane perpendicular to an axis at a predetermined plus and minus angles, and having sides with short axial lengths. And, it is formed by abutting and integrating the long sides with each other.

FIG. 3A is a plan view of a 90-degree elbow cover composed of five segments, and FIG. 3B is a diagram showing the correspondence between the segments when these segments are cut out from the cylindrical pipe cover. be.

The segment (a) of FIG. 3 (a) corresponds to the segment (a) of FIG. 3 (b), and the following segments (e) correspond to each of them.

Further, the segment angle β in FIG. 3B is calculated from the elbow angle α and the number of segments n by the following equation.
β = α / (2n-2) (Equation 1)

Since the elbow cover shown in FIG. 3A has an elbow angle α of 90 degrees and a number of segments of 5 from a to o, the angle β is 11.25 degrees.

Since the cutting jig for creating an elbow cover in the present embodiment cuts out these five segments from the cylindrical pipe cover, the saw grooves 13a and 13b are positive in the horizontal direction from the perpendicular plane of the longitudinal central axis of the side plate 11. There is an inclination of 11.25 degrees, and the saw grooves 14a and 14b also have an inclination of -11.25 degrees.

Further, the length a of the shorter generatrix of the segment (a), the segment (c), and the segment (d) and the length b of the longer generatrix have the radius of curvature of the central axis of the elbow R, and the pipe cover. Assuming that the inner diameter (that is, the outer diameter of the elbow) is d and the wall thickness of the pipe cover is e, it can be obtained by the following formula as described in Patent Document 1 described above.
a = 2 (Rd / 2-e) tanβ (Equation 2)
b = 2 (R + d / 2 + e) tanβ (Equation 3)

Next, the procedure for creating the five segments constituting the 90-degree elbow cover using the above-mentioned cutting jig for creating the elbow cover will be described.

First, the cylindrical pipe cover 2 is set in the cutting jig 1 for creating an elbow cover, the fixing flat plate 17 is inserted into the slit 21 of the cylindrical pipe cover 2, and the tip of the fixing flat plate 17 on the saw groove side is sawn. Move to the vicinity of 14b. After that, the fixing flat plate 17 is slid toward the side plate 11 and the cylindrical pipe cover 2 is pressed against the side plate 11 to be fixed. At this time, the saw groove 14a is aligned with the position at the point P of the segment (a) shown in FIG. 3 (b).

Next, in order to cut out the segment (a), a saw is inserted through the saw grooves 14a and 14b, and the cylindrical pipe cover 2 is cut along the saw groove up to the bottom plate 15.

Next, as shown in FIG. 2, the P point of the remaining cut cylindrical pipe cover 2 is aligned with the tip of the position mark 16a attached to the left side of the saw groove 13a. At this time, it is necessary to determine which of the three position marks the cylindrical pipe cover to be cut should be aligned with according to the notation attached to the position mark described later, and to select correctly.

FIG. 4A is a diagram showing the relationship between the saw groove 13a and the position mark 16a, and the saw groove 14a and the position mark 16b.

In FIG. 4A, the position mark 16a is indicated by an arrow for each of the three types of cylindrical pipe covers, and the tip of each indicates the position where the P point of the cylindrical pipe cover 2 is aligned. Further, the distance from the saw groove to each tip corresponds to the length b (PQ, RS) of the longer bus of the segment.

Next, in order to cut out the segment (a), a saw is inserted through the saw grooves 13a and 13b, and the cylindrical pipe cover 2 is cut along the saw groove up to the bottom plate 15.

Next, the Q point of the remaining cut cylindrical pipe cover 2 is aligned with the tip of the position mark 16b attached to the left side of the saw groove 14a.

In FIG. 4A, like the position mark 16a, the position mark 16b is also indicated by an arrow for each of the three types of pipe covers, and the tip of each indicates the position where the Q point of the cylindrical pipe cover 2 is aligned. There is. Further, the distance from the saw groove to each tip corresponds to the length a (QR) of the shorter bus of the segment.

Next, in order to cut out the segment (c), a saw is inserted into the saw grooves 14a and 14b, and the bottom plate 15 is cut along the saw groove.

Next, in order to cut out the segment (d), the R point of the remaining cylindrical pipe cover 2 is aligned with the tip of the position mark 16a attached to the left side of the saw groove 13a in the same manner as in the cutout of the segment (a). After that, the saw is passed through the saw grooves 13a and 13b, inserted, and cut along the saw groove up to the bottom plate 15. At this time, the remaining cut cylindrical pipe cover 2 becomes a segment (e).

The above is the procedure for creating the five segments constituting the 90-degree elbow cover using the cutting jig for creating the elbow cover. After that, the elbow cover is formed by abutting and integrating the side having a short bus length and the side having a long generatrix length into one.

In this way, in the elbow cover making cutting jig in which the angle from the perpendicular plane of the longitudinal central axis of the side plate of the saw groove is set by the bending angle of the elbow and the number of segments, the length a of the bus and the length b of the bus are used. Changes depending on the radius of curvature of the central axis of the elbow, the inner diameter of the pipe cover (that is, the outer diameter of the elbow), and the wall thickness of the pipe cover. By describing the radius of curvature, the inner diameter of the pipe cover (that is, the outer diameter of the elbow), and the wall thickness of the pipe cover, it is easy for the operator to set the position of the cylindrical pipe cover to be cut. It can be understood.

Also, instead of the inner diameter of the pipe cover, the name in the pipe cover standard can be used, and since the radius of curvature of the elbow is determined by the JIS standard for each outer diameter, the notation of the radius of curvature is indicated. It is also possible to omit it and indicate only the name and wall thickness of the pipe cover.

Further, in the present embodiment, both the position mark 16a and the position mark 16b are attached to the side plate 11 as shown in FIG. 4 (a), but the present invention is not limited to this, and the position mark 16b is attached as shown in FIG. 4 (b). Can be attached to the right side of the saw groove 14b of the side plate 12, that is, to the saw groove 13b side. As a result, the distance from the saw groove 14b to the tip of the position mark 16b is the longer side b of the generatrix as in the position mark 16a, so that the difference between the pipe covers of different sizes becomes large and it becomes easy to understand.

In such a case, the tip position of the cylindrical pipe cover aligned with the tip of the position mark 16b is not the Q point but the U point.

Further, the cutting jig for creating an elbow cover in the present embodiment is provided with only saw grooves having an inclination angle of plus β and minus β, but the present invention is not limited to this, and a set of saw grooves having an inclination angle β of 0 degree is provided. It is also effective to further provide the plates on both sides so that they are lined up in a straight line. This makes it possible to use this saw groove when adjusting the length of the straight pipe section of the segment (a) or segment (e) to cut accurately at the right-angled plane of the central axis of these segments. Become.

As described above, the cutting jig for creating the elbow cover in the present embodiment is provided with a position mark indicating the position where the tip of the cylindrical pipe cover is set, so that the cutting jig is marked in advance on the cylindrical pipe cover. You can easily create a segment for the elbow cover without it.

Further, by inserting the fixing flat plate into the slit provided in the cylindrical pipe cover to be cut and fixing the cylindrical pipe cover, it is possible to suppress the rotation of the cylindrical pipe cover in the circumferential direction, so that the remaining cut Cylindrical pipe cover can be accurately aligned with the position mark.

In the present embodiment, the cutting jig for creating an elbow cover when the elbow angle is 90 degrees and the number of segments is five has been described, but the present invention is not limited to this, as described in Patent Document 1 described above. It is also possible to use a cutting jig for creating an elbow cover for creating an elbow cover having an arbitrary elbow angle α and an arbitrary number of segments n.

That is, the elbow cover is created by setting the inclination angle β of the saw groove as the angle calculated from Equation 1, attaching the tip of the position mark 16a to the distance calculated from Equation 3, and attaching the tip of the position mark 16b to the distance calculated from Equation 2. A cutting jig for creating an elbow cover may be used, and segments (a) and segments (c) are cut out as many as the required number of segments in the same manner as in the procedure described in this embodiment. By repeating the process, the segments constituting the desired elbow cover can be easily created.

(Embodiment 2)
FIG. 5A is a cutting jig for creating a cylindrical pipe cover and an elbow cover when the cylindrical pipe cover is set at a position where a segment is cut out from the cylindrical pipe cover according to the second embodiment of the present invention. 5 (b) is a cross-sectional view cut along a plane perpendicular to the bottom surface through the central axis of the cylindrical pipe cover, and FIG. 5 (c) is the right side of a cutting jig for making an elbow cover in which the cylindrical pipe cover is set. It is a top view.

Hereinafter, only the configuration different from the cutting jig for creating the elbow cover in the first embodiment will be described.

The cutting jig for creating an elbow cover in the present embodiment is different in that the facing side plates 11 and 12 are not opposed in parallel but are diagonally opposed to each other.

In FIG. 5 (c), the side plate 11 and the side plate 12 have a shape that opens in a tapered shape from the lower side to the upper side, and are joined to the bottom plate 15 symmetrically with respect to the central axis in the longitudinal direction of the bottom plate 15. Therefore, the cylindrical pipe cover 2 shown by the solid line is in contact with the bottom plate 15 while being sandwiched between the plates on both sides, but the cylindrical pipe cover larger than that shown by the broken line is sandwiched between the plates on both sides. , It is fixed in a state of floating from the bottom plate 15.

In FIG. 5B, the fixing flat plate is composed of a flat plate portion 171 and an L-shaped plate portion 172, both members are screwed, and the height of the flat plate portion 171 is vertical by selecting the screw hole of the L-shaped plate portion 172. It is adjustable in the direction. Therefore, the flat plate portion 171 suspended by the suspending tool 18 can be moved up and down on the central axis of the bottom plate 15. Further, the hanging tool 18 can be slid in the longitudinal direction of the side plates along the side plates 11 and 12 as in the first embodiment.

The flat plate portion 171 of the fixing flat plate is used by being inserted into a slit provided in the cylindrical pipe cover to be cut, as in the first embodiment. Adjust the height by the above adjustment function so as to lower it. By inserting the flat plate portion 171 adjusted in this way into the slit, the cylindrical pipe cover can be prevented from rotating in the circumferential direction, and the cylindrical pipe cover can be pressed downward and fixed.

Further, since the position of the central axis when the cylindrical pipe cover is set on the cutting jig for creating the elbow cover in the present embodiment is always on the central axis in the lateral direction of the bottom plate 15 in FIG. 5 (a). The suspending tool 172 does not require a mechanism for moving the suspending flat plate in the lateral direction.

Further, as shown in FIG. 4B, the position mark 16b is preferably attached to the side plate 12 side. Since the distance from the saw groove 14b to the tip of the position mark 16b is the length b of the longer generatrix of the planar trapezoidal segment, the radius of curvature of the elbow, the outer diameter and wall thickness of the elbow, and the wall thickness of the pipe cover This is because the difference due to the difference between the two is large, so that it is easy for the operator to understand, and since the cylindrical pipe cover and the side plate 12 are in contact with each other, it is easy to align with the position mark 16b.

In this case, the tip position of the cylindrical pipe cover aligned with the tip of the position mark 16b is not the Q point but the U point.

The above is the structural difference between the cutting jig for creating the elbow cover in the present embodiment and the one in the first embodiment.

The saw groove of the cutting jig for creating an elbow cover in the present embodiment has a depth that reaches the bottom plate 15, but even the minimum outer diameter of the target cylindrical pipe cover is cylindrical from the bottom plate 15. The side plates 11 and 12 can be inclined so that the pipe cover floats.

As a result, the contact between the bottom plate 15 and the saw can be avoided when cutting the target cylindrical pipe cover, so that the saw blade can be protected.

Next, the procedure for cutting out the segments in the present embodiment is the same as in the case of the first embodiment.

As described above, the cutting jig for creating the elbow cover in the present embodiment is provided with a position mark indicating the position where the cylindrical pipe cover is set, as in the first embodiment. You can easily create segments for elbow covers without scoring the cover.

Further, by inserting the fixing flat plate into the slit provided in the cylindrical pipe cover to be cut and fixing the cylindrical pipe cover, it is possible to suppress the rotation of the cylindrical pipe cover in the circumferential direction, so that the remaining cut Cylindrical pipe cover can be accurately aligned with the position mark.

Further, the cutting jig for creating an elbow cover in the present embodiment has an advantage that it is not necessary to move and adjust the fixing flat plate in the lateral direction of the bottom plate, and the cylindrical pipe cover can be easily set.

The present invention is useful for a cutting jig for making an elbow cover, and is suitable for cutting out a segment constituting the elbow cover from a cylindrical pipe cover.

1 Cutting jig for making elbow cover 2 Cylindrical pipe cover 11, 12 Side plate 13a, 13b, 14a, 14b Saw groove 15 Bottom plate 16a, 16b Position mark 17 Fixing plate 18 Hanging tool 21 Cylindrical pipe cover slit 171 Flat plate Part 172 L-shaped plate part

Claims (4)

A saw groove, which is a cutting guide, is provided on two opposite side plates, and a cutting tool passing between the both side plates is moved along the saw groove to cut the cylindrical pipe cover set between the side plates. A cutting jig for making an elbow cover to be used together with the cutting tool.
The saw groove is composed of a set of saw grooves having a positive predetermined angle in the horizontal direction with respect to a right-angled surface of the longitudinal central axis of the side plate, and a set of saw grooves having a negative predetermined angle inclination.
Further, a position mark attached to the side plate indicating a position where the tip of the cylindrical pipe cover is set,
A cutting jig for creating an elbow cover, comprising a fixture having a fixing flat plate suspended from above in the direction perpendicular to the bottom plate. The predetermined angle of the saw groove with respect to the perpendicular plane of the longitudinal central axis of the side plate is set according to the bending angle of the elbow and the number of trapezoidal segments viewed in a plane constituting the elbow cover.
The position mark indicates a position where the tips of the cut surfaces of the cylindrical pipe cover cut at the predetermined angle are aligned, and the distance from the position mark to the saw groove is a short generatrix of the segment. 1, which corresponds to at least one of the length and the length of the long bus, and is set according to the inner diameter and wall thickness of the cylindrical pipe cover, the radius of curvature of the elbow, and the predetermined angle. Cutting jig for making elbow cover described in. The cylindrical pipe cover has a slit that penetrates to the internal space in the longitudinal direction.
The cutting jig for creating an elbow cover according to claim 1 or 2, wherein the fixing flat plate is inserted into a slit of the cylindrical pipe cover to fix the cylindrical pipe cover. The cutting jig for creating an elbow cover according to claim 3, wherein the fixture slidably suspends the fixing flat plate in the direction of the side plate.

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