JPH1170492A - Duct cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold every size of ducts and easily and accurately cut them by splittingly forming a duct receiver part into a fixed-side duct receiver part and a moving-side duct receiver part, by letting the fixed-side duct receiver part to hold one end of the duct in the short-side direction, and by letting the moving-side duct receiver to hold the other end. SOLUTION: A duct receiver part 2 is splitted into a fixed-side duct receiver part, 6 and a moving-side duct receiver part 7 so that the both side walls of dual duct half bodies 8, 9 are held by the fixed-side duct receiver part 6 and the moving-side duct receiver part 7 respectively. A recess part in which the both side walls of one of the duct half bodies 8, 9 are inserted and held is provided in the top part of the fixed-side duct receiver part, 6 which is fixed to a cutter main body 4, and a recess part in which the both side walls of the other duct half bodies 8, 9 are inserted and held is provided in the top part of the moving-side duct receiver part 7 which is mounted on the cutter main body 4 so as to be freely slid in the short-side direction of the duct. The moving-side duct receiver part 7 is thus moved according to the sizes of the ducts so that the every sizes of ducts can be held and cut.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duct cutting machine for cutting a duct made of a synthetic resin for protecting electric wiring, piping and the like into a predetermined length.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
A duct cutting machine described in Japanese Patent No. 5316 is proposed. In this duct cutting machine, a pair of duct halves having a substantially U-shaped cross section formed by dividing a cylindrical duct is cut in a state where the duct halves are overlapped in a double orientation.

In this duct cutting machine, a bearing member 21 is erected on the cutting machine main body 4, and a cutting tool mounting plate 22 provided with a cutting tool 3 comprising a cutting blade is mounted on the bearing member 21 so that the tip of the cutting blade is raised and lowered. The cutting tool mounting plate 2 is pivotally attached so as to be free.
2 is provided with a cutting blade, and the duct receiving part 2 is connected to the bearing member 21 in an upright state. The upper edge of the duct receiving part 2 matches the interval between the left and right ends of several types of duct halves having different sizes. Several types of fitting grooves 23 are formed at intervals.

[0004] A pair of fitting grooves 23 are selected according to the size of the duct half, and the left and right edges of the duct half are turned downward, and the duct half is shifted back and forth into the pair of fitting grooves 23. Support it without moving. Then, by holding the handle 10 of the cutting tool and lowering the pressure, the supported duct half is cut.

In this duct cutting machine, various sizes of duct halves are selected and set by selecting a pair of fitting grooves 23 adapted to the sizes, so that duct halves of different sizes are securely supported, and the duct halves are different. Can cut the body.

[0006]

However, in the above-described conventional duct cutting machine, the fitting groove 2 provided in the duct receiving portion 2 is not provided.
3 are formed only at predetermined intervals,
Only a few types of ducts that fit into the pair of fitting grooves 23 can be applied. In order to cut a duct that does not fit in size, a duct receiver having a pair of fitting grooves 23 that fits the size of the duct must be prepared and replaced with this duct receiver. It is. To cut ducts of any size, a pair of fitting grooves 2
3 has to prepare a number of slightly different duct receivers, it takes time to select the duct receiver,
The management of the duct receiving part is troublesome.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a duct cutting machine which can hold and cut ducts of all sizes, and which can cut easily, accurately and quickly. It is in.

[0008]

In order to achieve the above object, according to the present invention, there is provided a duct receiving portion for holding a duct, a cutting tool for cutting the duct, and a cutting machine body. And a leg 5 for supporting the
The duct receiving part 2 is divided into a fixed duct receiving part 6 fixed to the cutting machine body 4 and a movable duct receiving part 7 slidable in the short direction of the duct 1. The fixed-side duct receiving portion 6 holds one end of the
The moving-side duct receiving portion 7 holds the other side end portion.

In such a duct cutting machine, the duct receiving portion 2 fixed to the cutting machine main body 4 and holding the duct 1 is connected to the fixed-side duct receiving portion 6 and the movable-side duct slidable in the short direction of the duct 1. The fixed-side duct receiving portion 6 and the moving-side duct receiving portion 7 are respectively formed on the both sides of the duct 1 in the short direction. The movable side duct receiving portion 7 is slid to a position corresponding to the interval between both ends of the duct 1, and this duct 1
The duct 1 can be cut by the cutting tool 3 while holding.

According to a second aspect of the present invention, in the first aspect of the invention, the duct 1 is divided into duct halves 8 and 9 having a substantially U-shaped cross section, and the fixed-side duct receiving portion 6 and the movable side are formed. Each side wall 8 of each of the duct halves 8 and 9 is
The concave portions 6a and 7a for holding the holes a and 9a are formed.

Such a duct cutting machine has a cylindrical duct 1 formed by fitting a pair of duct halves 8, 9 having a substantially U-shaped cross section at the distal ends of both side walls 8a, 9a. One side of both side walls 8a, 9a of the duct halves 8, 9 is used for cutting, and one side is fitted and held in a concave portion 6a provided in a fixed side duct receiving portion 6, and the other side is a concave portion 7a provided in a moving side duct receiving portion 7. The duct halves 8, 9 are cut in a state where the duct halves 8 and 9 are fitted and held.

According to a third aspect of the present invention, in the second aspect of the present invention, the fixed-side bottom piece 1 whose upper end forms the bottom surface of the concave portion 7a of the movable-side duct receiver 7 in the fixed-side duct receiver 6.
1 is provided on the movable-side duct receiving portion 7, and a movable-side bottom piece 12 whose upper end forms the bottom surface of the concave portion 6a of the fixed-side duct receiving portion 6 is provided. , 7a are provided on both side walls 8 of the duct halves 8, 9
It is characterized in that it is formed to be lower toward the tip so as to substantially coincide with the heights of a and 9a.

In such a duct cutting machine, the bottom surface of the concave portion 6a of the fixed-side duct receiving portion 6 is formed by the moving-side bottom piece 12 that is lower at the tip provided on the moving-side duct receiving portion 7, and the movable-side duct receiving portion 7 is formed. Is formed by the fixed-side bottom piece 11 that is lower toward the tip provided in the fixed-side duct receiving portion 6, so that the difference in height between the side walls 8 a and 9 a depending on the size of the duct halves 8 and 9. Simultaneously, when the moving-side duct receiving portion 7 is slid, the depths of the concave portions 6a, 7a change, and the bottom surfaces of the concave portions 6a, 7a hold the tips of both side walls 8a, 9a of the duct halves 8, 9, and Recesses 6a, 7a
The duct halves 8, 9 can be cut while holding the bottom surfaces of the duct halves 8, 9 at the upper ends of the fixed-side duct receiving portion 6 and the moving-side duct receiving portion 7 therebetween.

The invention according to a fourth aspect is characterized in that, in the inventions according to the first to third aspects, the cutting tool 3 comprises a cutting blade pivotally mounted on the main body 4 of the cutting machine.

In such a duct cutting machine, since the cutting tool 3 is formed of a cutting blade pivotally mounted on the cutting machine main body 4, the duct 1 can be cut from above by lowering the pressure of the cutting blade.

A fifth aspect of the present invention is characterized in that, in the first to fourth aspects of the present invention, a heating unit 18 for heating the duct 1 is provided in the cutting machine main body 4.

In such a duct cutting machine, since the heating unit 18 for heating the duct 1 is provided in the cutting machine main body 4,
The duct 1 warmed by the heating unit 18 can be cut.

According to a sixth aspect of the present invention, in the first to fifth aspects of the present invention, a pair of legs 5 and 5 are provided at both ends of the cutting machine main body 4 in the direction in which the duct 1 is cut. It is characterized in that the distance between the two legs is formed to be stretchable.

In such a duct cutting machine, when the large-sized duct 1 is cut, when the distance between the sliding moving-side duct receiving portion 7 and the fixed-side duct receiving portion 6 increases,
The leg 5 holding the cutting machine body 4 extends in the sliding direction of the moving-side duct receiving portion 7 so that the duct cutting machine can be stably supported, and the leg 5 is contracted and stored compactly when not in use. Can be.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A duct cutting machine according to an embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is an external perspective view showing a duct cutting machine when a small-sized duct 1 is cut.

FIG. 2 is a longitudinal sectional view showing a main part of the above-described duct cutting machine.

FIG. 3 is an external perspective view showing the duct cutting machine when the large-sized duct 1 is cut.

FIG. 4 is a longitudinal sectional view showing a main part of the above-described duct cutting machine.

As shown in FIGS. 1, 2, 3 and 4,
The duct cutting machine includes a pair of duct halves 8, each having a substantially U-shaped cross section, which are fitted at their distal ends to form a cylindrical duct 1.
9 is cut to a predetermined length, and both side walls 8a, 9a
Is held by the duct receiving portion 2 and cut in the short direction.

The duct halves 8 and 9 are doubled with one side upside down, and both side walls 8a of the duct half 8 and both side walls 9a of the duct half 9 and the bottom plate 8b of the duct half 8 and the duct half. The body 9 is cut in a state where the bottom plates 9b are in close contact with each other.

The duct receiving portion 2 is divided into a fixed-side duct receiving portion 6 and a moving-side duct receiving portion 7, and the side walls 8a, 9a of the double duct halves 8, 9 are fixed to the fixed-side duct receiving portion 6, respectively. And the moving-side duct receiving portion 7. Further, a cutting tool 3 for cutting the duct halves 8 and 9 and a leg 5 for supporting the cutting machine body 4 are provided.

The fixed-side duct receiving portion 6 is fixed to the cutting machine main body 4 and has one side wall 8a, 9 of one of the duct halves 8, 9 at the upper part.
A recess is provided for inserting and holding a. The moving-side duct receiving portion 7 is mounted on the cutting machine body 4 so as to be slidable in the short direction of the duct 1, and has a concave portion for inserting and holding the other two side walls 8 a, 9 a of the duct halves 8, 9 at the upper portion. Provided.

FIG. 5 is a sectional view showing the duct 1 cut by the above-described duct cutting machine. FIGS. 5A to 5D show four types of ducts 1 having different sizes.

As shown in FIGS. 5 (a) to 5 (d), the duct halves 8, 9 are formed of a synthetic resin or the like, and the bottom plates 8b, 9
b and both side walls 8a, 9a erected from both ends of the bottom plates 8b, 9b. Here, both side walls 8a
Since the height of the side walls 9a is different from the height of the side walls 9a, the half of the side wall is referred to as a duct half 8 and the lower side thereof is referred to as a duct half 9 for convenience. Since the space between both side walls 8a, 8a of the duct half 8 and the space between both side walls 9a, 9a of the duct half 9 are substantially the same, when the duct half 9 is overlapped on the duct half 8, both sides are formed. This is performed so that the wall 9a pushes and expands the side walls 8a.

The larger the size of the duct 1, that is, the larger the distance between the side walls 8a, 8a or the distance between the side walls 9a, 9a, the higher the height of the side walls 8a and both side walls 9a. .

Each of the side walls 8a, 9a has a fitting portion for fitting a pair of duct halves 8, 9 at the distal end thereof. The fitting portion of the duct half 8 is formed by a bent piece 8d formed by bending the tip of both side walls 8a inward, and a thin tube piece 8e protruding outward from the tip of the bent piece 8d. A concave groove 8c is formed between the bent piece 8d and the thin tube piece 8e. The fitting portion of the duct half 9 is composed of a convex portion 9c formed by bending the distal end portions of both side walls 9a inward. When assembling the duct 1, both ends 9 a of the duct half 9 are expanded outward so that the tip of the convex portion 9 c slides on the outer surface of the small tube piece 8 e of the duct half 8, and the groove 9 c is formed. The cylindrical duct 1 is formed by fitting.

The cutting machine main body 4 has a support 13 extending across the pair of legs 5 and 5, and a cutting tool holding plate 14 provided at an end of the support 13 and rotatably mounting the cutting tool 3 on a shaft. It is composed of

The leg portion 5 is formed in a rectangular flat plate shape, and its longitudinal direction is juxtaposed to a direction orthogonal to the short direction of the duct 1.

The support base 13 is a rectangular cylindrical fixed side support base 13a having an open end provided from the center of the leg 5 on the cutting tool holding plate 14 side toward the other leg 5, and the other leg. Part 5
And a rectangular cylindrical movable-side support 13b slidably fitted into the fixed-side support 13a, which is provided from the center toward the leg 5 on the cutting tool holding plate 14 side.
The moving-side support 13b passes through the fixed-side support 13a through the duct 1
Can be slid in the short direction of the moving side support 13b.
The leg 5 fixed to the duct 1 is slidable in the short direction of the duct 1. The movable support 13b can be fixed to the fixed support 13a by a fixing means such as a screw.

The cutting tool holding plate 14 is formed in a pair of flat plates, and is provided at the outer end of the fixed support 13a in parallel with the short direction of the duct 1.

The cutting tool 3 is formed of a rectangular cutting blade, and one end of the cutting tool 3 is axially attached to both cutting tool holding plates 14 and 14 in a sandwiched state. A bar-shaped handle 10 is provided on the upper edge of the cutting blade.
The cutting blade is raised and lowered by holding the handle 10 and rotating the cutting blade about an axis. The handle 10 can slide and fix the upper edge of the cutting blade.

The fixed-side duct receiving portion 6 is formed in a pair of flat plates, and is placed on the upper surface of the fixed-side support base 13a so as to face in parallel with the short direction of the duct 1. The gap between the fixed-side duct receiving portions 6 and 6 forms a blade groove 15 into which the cutting blade is inserted. A recess 6a for fitting and holding one of the side walls 8a, 9a of the duplex duct halves 8, 9 is formed substantially at the center of the upper portions of the fixed side duct receiving portions 6, 6.

The moving-side duct receiving portion 7 is formed in a pair of flat plates like the fixed-side duct receiving portion 6, and is placed on the upper surface of the fixed-side support base 13a so as to face in parallel with the short direction of the duct 1. Have been. The gap between both moving-side duct receiving portions 7, 7 forms a blade groove 15 into which the cutting blade is inserted. A double duct half 8 is provided substantially at the center of both moving-side duct receiving portions 7, 7.
A recess 7a for fitting and holding the other side of the two side walls 8a, 9a of 9 is formed.

Guide pieces 16 for guiding the fixed-side duct receiving portion 6 and the moving-side duct receiving portion 7 from both sides are provided upright on both ends along the longitudinal direction of the upper surface of the fixed-side support base 13a.

A fixed bottom piece 11 whose upper end forms the bottom surface of the concave portion 7a of the movable duct receiving portion 7 is provided on each side surface of the fixed duct receiving portions 6 and 6, and the movable duct receiving portions 7 and 6 are provided. 7
The movable side bottom piece 12 whose upper end forms the bottom surface of the concave portion 6a of the fixed side duct receiving portion 6 is provided on each side surface. The fixed-side bottom piece 11 and the moving-side bottom piece 12 are formed in a step shape that is lower toward the tip. The number of steps, height and length of the step-like fixed bottom piece 11 and the movable bottom piece 12 are set as follows according to the size of the duct 1 to be cut.

First, the interval and height between both side walls 8a of the plurality of duct halves 8 having different sizes to be cut are clarified in advance. Next, when the interval between the concave portions 6a and 7a is adjusted to the interval between the side walls 8a and 8a, the depth of the concave portions 6a and 7a is substantially equal to the height of the side walls 8a, that is, Both ends of the side walls 8a are held in contact with the upper end of the fixed-side bottom piece 11 or the movable-side bottom piece 12, and
The inner surface of the bottom plate 9b of the duct half 9 in the double state is formed with both concave portions 6a,
It is set so as to be held in contact with the upper ends of the fixed-side duct receiver 6 and the movable-side duct receiver 7 between 7a.

The fixed bottom piece 11 and the movable bottom piece 12
May not be formed in a stepped shape, but may be formed in a tapered shape with a lower end.

Further, when the movable-side duct receiving portion 7 is slid toward the fixed-side duct receiving portion 6, the movable-side bottom piece 12,
The distance between 12 is fixed to both fixed side bottom pieces 1 via a spacer or the like.
It is formed wider than the interval between 1 and 11.

The two guide pieces 16, 16 are arranged so that the cutting blade continuously inserted into the blade groove 15 of the fixed duct receiving portion 6 and the movable duct receiving portion 7 does not contact the upper surface of the fixed support 13a.
The two guide pieces 16, 1 are provided on the side of the movable support table 13b at the upper end.
There are provided 17 cutting blade stoppers spanning 6.

Such a duct cutting machine is used as follows.

First, the distance between the concave portion 6a of the fixed-side duct receiving portion 6 and the concave portion 7a of the moving-side duct receiving portion 7 matches the distance between the side walls 8a of the duct half 8 to be cut. Slide the part 7. Next, the duct half 9 is turned upside down and double overlapped with the duct half 8, and in the double state, the side walls 8a, 8a and one of the side walls 9a, 9a are recessed on the fixed side duct receiving portion 6 side. 6a, and the other side is inserted into the concave portion 7a on the moving-side duct receiving portion 7 side. Then, the cutting blade is pushed down by holding the handle 10 to lower the pressure, and the two duct halves 8 and 9 are cut at the same time. The cutting blade stops when its cutting edge comes into contact with the upper end of the cutting blade stopper 17, and the portion of the cutting blade that cuts the duct 1 does not collide with the fixed support 13a.

As shown in FIG. 2, when the small-sized duct 1 is cut, the movable duct receiving portion 7 is slid toward the fixed duct receiving portion 6 so as to match the distance between the side walls 8a, 8a. The space between the concave portions 6a and 7a is reduced. At this time, the fixed-side bottom piece 1 located on each bottom face of both recesses 6a, 7a
1 and the height of the upper end of the moving-side bottom piece 12 increase in accordance with the height of the side walls 8a.

As shown in FIG. 4, when cutting the large-sized duct 1, the movable duct receiving portion 7 is slid in the direction opposite to the fixed duct receiving portion 6 side, so that the side walls 8a,
The interval between the concave portions 6a and 7a is increased in accordance with the interval between 8a. At this time, the heights of the upper ends of the fixed-side bottom piece 11 and the movable-side bottom piece 12 located on the bottom surfaces of both the recesses 6a, 7a are reduced corresponding to the height of the side walls 8a.

In such a duct cutting machine, the ends of both side walls 8a, 9a of the duct halves 8, 9 are inserted into the recesses 6a, 7a, and come into contact with the upper end of the fixed bottom piece 11 or the movable bottom piece 12. And the bottom plate 9b of the duct half 9
Is in contact with the upper ends of the fixed-side duct receiving portion 6 and the moving-side duct receiving portion 7 between the concave portions 6a, 7a, so that even if the cutting blade is pressed from above the duct halves 8, 9, the duct half 8 ,
9 can be cut without deformation. Therefore, cracking or chipping due to deformation of the duct halves 8, 9 at the time of cutting is prevented.

Further, only by sliding the moving-side duct receiving portion 7 in accordance with the size of the duct 1, it is possible to simultaneously hold the tips of the side walls 8 a of the duct half 8 and the inner surface of the bottom plate 9 b of the duct half 9. it can.

The cutting blade has a cutting blade stopper 1
7 stops by contacting the upper end to protect the cutting portion of the cutting blade and prevent deterioration of the cutting blade such as blade spillage.

Further, since the interval between the two legs 5, 5 can be freely extended and contracted in the sliding direction of the movable duct receiving portion 7,
When the duct 1 is cut, the distance between the two legs 5, 5 is increased, so that the cutting machine body can be stably supported, and when the duct cutting machine is not used, the legs 5 are contracted to make the duct cutting machine compact. be able to.

FIG. 6 is an external perspective view in which a part of a main part of a duct cutting machine different from the above-mentioned embodiment of the present invention is partially cut away.

As shown in FIG. 6, this duct cutting machine
It has substantially the same configuration as the above-mentioned duct cutting machine. The difference from the above-mentioned duct cutting machine is that the heating unit 1 for heating the duct inside the fixed-side duct receiver 6 or the movable-side duct receiver 7 is provided.
8 is provided.

The heating section 18 warms the duct to be cut at the time of cutting. The duct made of synthetic resin is heated by the heating section 18 and becomes soft, so that the duct is prevented from being cracked or chipped at the time of cutting and is light. The duct can be cut by force.

Although only a method of cutting the pair of duct halves 8 and 9 having a substantially U-shaped cross section has been described with reference to FIGS. Can be cut using a duct cutting machine having a fixed duct receiving portion and a moving duct receiving portion as described above. For example, when the duct has a cylindrical shape, the shape of the portion that holds both ends of the duct is formed in an arc shape that holds the duct obliquely below, and when the duct is a rectangular tube, the edge that holds the lower edge of the duct is formed. It is formed in a mold, and the moving-side duct receiving portion is moved according to the size of the duct.

In the above-described duct cutting machine, the moving-side duct receiving portion is slid according to the interval between the side walls 8a, 8a, but this sliding may be performed automatically. For example, a sensor for detecting the interval between the side walls 8a, 8a is provided in the fixed-side duct receiving portion or the moving-side duct receiving portion.
The moving-side duct receiver moves while the cutting tool is pressed down so that the distance between the a and 8a and the distance between the fixed-side duct receiving part and the moving-side duct receiving part substantially match.

In such a duct cutting machine, since both ends in the short direction of the duct can be automatically held in accordance with the size of the duct, the trouble of moving the moving-side duct receiving portion can be omitted.

[0060]

According to the first aspect of the present invention, the duct receiving portion for holding the duct is divided into the fixed-side duct receiving portion and the movable-side duct receiving portion slidable in the short direction of the duct. By moving the moving-side duct receiving portion according to the size of the duct, it is possible to hold and cut ducts of any size. Therefore, according to the size of the duct to be cut, it is not necessary to replace the duct receiving portion.

According to the second aspect of the present invention, one of a pair of duct halves having a substantially U-shaped cross section is turned upside down, and the two ducts are overlapped with each other. The two duct halves can be cut at the same time by being fitted and held in the concave portion of the moving side duct receiving portion, so that it is not necessary to cut both the duct halves to be fitted separately, and the length of the both duct halves to be fitted Can be substantially matched. Therefore, there is no step between the two duct halves at the end face of the duct, and this step can be omitted, and the appearance of the end of the duct is improved.

According to the third aspect of the present invention, the bottom surface of the concave portion of the fixed-side duct receiving portion is formed by the lower moving-side bottom piece at the tip provided in the moving-side duct receiving portion. Since the bottom surface is formed by a fixed bottom piece that is lower toward the tip provided in the fixed duct receiving portion, the tips of both side walls are held in contact with the upper ends of the fixed bottom piece or the moving bottom piece and the inner surface of the bottom plate Are held in contact with the upper ends of the fixed-side duct receiving portion and the moving-side duct receiving portion between the two concave portions, so that the duct can be cut without being deformed. Therefore, even if the duct is pressed from above, the duct can be cut without being deformed, so that the duct can be prevented from being cracked or chipped, and the appearance and yield of the duct are improved.

According to the fourth aspect of the present invention, since the cutting tool is formed of the cutting blade pivotally mounted on the cutting machine main body, the cutting blade can be easily cut from above the duct by applying a lower pressure.

According to the fifth aspect of the present invention, since the heating unit for heating the duct is provided in the cutting machine main body, the duct heated by the heating unit can be cut. Therefore, even when the temperature is low in winter or the like, the duct is warmed by the heating unit and becomes soft, so that the duct can be prevented from being cracked or chipped at the time of cutting, and the duct can be cut with a light force.

According to the sixth aspect of the present invention, since the leg portion can be extended and contracted in the sliding direction of the movable duct receiving portion, the leg portion is extended when the duct is cut, and the cutting machine body is stably supported. When the duct cutting machine is not used, the legs can be shortened and stored compactly, and can be stored in a small storage space.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an external appearance of a duct cutting machine according to an embodiment of the present invention, particularly showing a duct cutting machine for cutting a small-sized duct.

FIG. 2 is a longitudinal sectional view showing a main part of the above-described duct cutting machine.

FIG. 3 is an external perspective view showing the above-described duct cutting machine, particularly showing the duct cutting machine when cutting a large-sized duct.

FIG. 4 is a longitudinal sectional view showing a main part of the above-described duct cutting machine.

FIG. 5 is a cross-sectional view showing a duct cut by the above-described duct cutting machine, and (a) to (d) show four types of ducts having different sizes.

FIG. 6 is an external perspective view in which a part of a main part of a duct cutting machine different from the above according to the embodiment of the present invention is cut away.

FIG. 7 is a front view showing a conventional duct cutting machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Duct 2 Duct receiving part 3 Cutting tool 4 Cutting machine main body 5 Leg part 6 Fixed side duct receiving part 6a Depression 7 Moving side duct receiving part 7a Depression 8 Duct half (large) 8a Both side walls 8b Bottom plate 8c Concave groove 8d Bent piece 8e Narrow tube piece 9 Duct half body (small) 9a Side walls 9b Bottom plate 9c Convex portion 10 Handle 11 Fixed side bottom piece 12 Moving side bottom piece 13 Support stand 13a Fixed side support stand 13b Moving side support stand 14 Cutting tool holding plate 15 Blade groove 16 Guide piece 17 Cutting blade stopper 18 Heating part 21 Bearing member 22 Cutting tool mounting plate 23 Fitting groove

Claims (6)

[Claims] 1. A fixed-side duct receiving portion fixed to a cutting machine body in a duct cutting machine having a duct receiving portion for holding a duct, a cutting tool for cutting the duct, and a leg portion for supporting the cutting machine body. The duct receiving portion is divided into a movable duct receiving portion that is slidable in the short direction of the duct, and the fixed side duct receiving portion holds one end of the duct in the short direction and the other side. A duct cutting machine characterized in that an end portion is held by a moving-side duct receiving portion. 2. A duct is formed by dividing into a duct half having a substantially U-shaped cross section, and concave portions for holding both side walls of the duct half are formed in the fixed duct receiving portion and the moving duct receiving portion. The duct cutting machine according to claim 1, wherein: 3. The fixed-side duct receiving portion is provided with a fixed-side bottom piece whose upper end forms the bottom surface of the concave portion of the movable-side duct receiving portion, and the upper end forms the bottom surface of the concave portion of the fixed-side duct receiving portion in the moving-side duct receiving portion. The upper end of the fixed-side bottom piece and the upper end of the movable-side bottom piece are formed so as to be lower toward the tip so that the depth of both recesses substantially matches the height of both side walls of the duct half. The duct cutting machine according to claim 2, wherein 4. The duct cutting machine according to claim 1, wherein the cutting tool comprises a cutting blade pivotally mounted on the cutting machine main body. 5. The duct cutting machine according to claim 1, wherein a heating unit for heating the duct is provided in the cutting machine main body. 6. A cutting machine according to claim 1, wherein a pair of legs are provided at both ends of the cutting machine body in a direction in which the duct is cut, and a space between the legs is formed to be stretchable. The described duct cutting machine.