JP2019005831A - Duct cut device - Google Patents

Abstract

To provide a duct cut device which can easily cut a round duct without causing sparks at an installation site.SOLUTION: A duct cut device includes: an elongated beam 2; a leg body 3 supporting the beam 2; multiple rollers 4 which are disposed on the beam 2 and support a round duct 100 so that the round duct 100 can rotate around its axis; a hole punch device 5 which is disposed at the beam 2 and is pressed to the round duct 100 supported by the rollers 4 to form a start hole 100a at the round duct 100; and a cutter 6 which is disposed at the beam 2 and performs shirring to the round duct 100 to cut the round duct 100 with a blade 631 inserted into the start hole 100a.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a duct cutting device for cutting a round duct, and more particularly to a duct cutting device for cutting at an installation site.

  Conventionally, when a round duct such as a spiral duct is cut to a desired length at an installation site, a high-speed cutter has been used (for example, see Non-Patent Document 1). This high-speed cutter cuts a round duct by pressing a disk-shaped grindstone rotated at high speed against the round duct.

“Standard Duct Text”, published by the National Federation of Duct Industry Associations, July 2013, p.27

  By the way, when a round duct is cut with a high-speed cutter, since a spark is generated, it is necessary to surround the high-speed cutter with a plate or the like for safety. However, providing the enclosure requires labor and time. In particular, the enclosure must be provided every time the high-speed cutter is moved, which requires a lot of labor and time. For this reason, there is a possibility that a high-speed cutter may be used without being enclosed, in which case it becomes a safety problem.

  Accordingly, an object of the present invention is to provide a duct cutting device that can easily cut a round duct without generating a spark at an installation site.

  In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that an elongated beam, a leg supporting the beam, and a circular duct disposed around the beam are rotated around its axis. A plurality of rollers that freely support, a hole punch device that is disposed on the beam and that presses against the round duct supported by the roller to form a start hole in the round duct, and is disposed on the beam, A duct cutting device comprising: a cutter for shearing and cutting the round duct with a blade inserted into the start hole.

  According to a second aspect of the present invention, in the duct cutting device according to the first aspect, the leg is foldable.

  According to a third aspect of the present invention, in the duct cutting device according to the first or second aspect, the legs are extendable.

  According to a fourth aspect of the present invention, in the duct cutting device according to the first to third aspects, the beam is telescopic.

  According to a fifth aspect of the present invention, in the duct cutting device according to the first to fourth aspects, the roller is disposed so as to be able to support the round ducts having different diameters.

  According to a sixth aspect of the present invention, in the duct cutting device according to the first to fifth aspects, the hole punching device is disposed in the punch handle and a punch handle that is pivotable around one end and the punch handle. A punch for forming the start hole, and pressing the other end of the punch handle to press the punch against the round duct to form the start hole.

  A seventh aspect of the present invention is the duct cutting device according to the first to sixth aspects, wherein the cutter is connected to a movable cutter arm having one end connected to the beam and to the other end of the cutter arm. And a cutter body for shearing, and the cutter arm is moved to move a blade of the cutter body to a desired position.

  According to invention of Claim 1, a round duct is mounted on a roller, a start hole is formed in a round duct with a hole punch, and the blade of a cutter is inserted into this start hole, and shearing processing (shear processing) ) Cut the round duct. As described above, since the round duct is cut by the shearing process, no spark is generated, and there is no need to provide an enclosure around it. Similarly, since the start hole is formed in the round duct by pressing the hole punch device, no spark is generated. Therefore, the labor and time for providing the enclosure can be reduced. Further, since the round duct supported by the roller is rotatable around the axis, the round duct can be easily and properly cut by performing the shearing process while turning the round duct. Thus, according to the present invention, it is possible to easily cut the round duct without generating a spark at the installation site of the round duct.

  On the other hand, a roller, a hole puncher, and a cutter are arranged on the beam, and the beam is simply provided with a leg, and it does not require a large electric motor or power supply, so it can be reduced in weight and size. Therefore, it can be easily carried to the installation site of the round duct.

  According to the invention described in claim 2, since the leg is foldable, it can be easily carried and stored.

  According to the third aspect of the present invention, since the leg can be expanded and contracted, the cutting work can be performed more easily and safely by expanding and contracting the leg in accordance with the environment of the installation site or the condition of the operator. Is possible.

  According to the invention described in claim 4, since the beam can be expanded and contracted, the beam can be expanded and contracted according to the length of the round duct, etc., so that the round duct is properly supported, thereby making it possible to perform the cutting operation more easily and safely. Can be done.

  According to invention of Claim 5, since the roller is arrange | positioned so that the round duct from which a diameter differs can be supported, the several round duct from which a diameter differs can be cut | disconnected by one duct cutting device.

  According to the sixth aspect of the present invention, since the start hole is formed in the round duct simply by pressing down the other end of the punch handle, the start hole can be formed easily and quickly.

  According to invention of Claim 7, since the blade of a cutter main body can be moved to a desired position by moving a cutter arm, it becomes possible to perform a shearing process more easily and safely.

It is a front view which shows the duct cutting device which concerns on embodiment of this invention. It is the side view which looked at the duct cutting device of FIG. 1 from AA. It is a top view of the duct cutting device of FIG. It is a figure which shows the expansion-contraction location of the 1st leg part of the leg of the duct cutting device of FIG. It is the side view which looked at the duct cutting device of FIG. 1 from BB. It is the side view which looked at the duct cutting device of FIG. 1 from CC. It is the side view which looked at the duct cutting device of FIG. 2 from DD. It is the front view (a) and top view (b) which show the cutter main body and holding tool of the cutter of the duct cutting device of FIG.

  The present invention will be described below based on the illustrated embodiments.

  1 to 8 show an embodiment of the present invention, FIG. 1 is a front view showing a duct cutting device 1 according to this embodiment, and FIG. 3 is a plan view thereof. The duct cutting device 1 is a device for cutting the round duct 100 at the installation site of the round duct 100, and mainly includes the beam 2, the leg body 3, the roller body 40, the hole punch device 5, and the cutting device. 6.

  The beam 2 is long and is composed of a first beam 21, a second beam 22, and a third beam 23, and is extendable. That is, the second beam 22 and the third beam 23 made of a long hollow material having a rectangular cross section are inserted into and out of both ends of the first beam 21 made of a long hollow material having a rectangular cross section. Has been. The second beam 22 and the third beam 23 are fixed by tightening the first fixing screws 24 provided at both ends of the first beam 21.

  The legs 3 support the beam 2, are foldable, and are respectively disposed on both ends of the beam 2. That is, as shown in FIG. 1, a substantially rectangular side surface portion 31 a as viewed from the front and back of the beam 2, and as illustrated in FIG. 2, a substantially triangular front surface portion 31 b as viewed from the end side of the beam 2. Are provided at both ends of the beam 2. And the rod-shaped 1st leg part 32 and the 2nd leg part 33 are arrange | positioned along the triangular hypotenuse of the leg support part 31, and upper end parts 32a and 33a can turn to the side part 31a of the leg support part 31 so that rotation is possible. It is connected.

  Further, as shown in FIG. 1, arc-shaped first slits 31 c are formed on both side surface portions 31 a of the leg support portions 31, while the both leg portions 32 and 33 are provided with the first slits 31 c through the first slits 31 c. The leg handle 34 is screwed. Then, by loosening the leg handle 34 and rotating the both leg portions 32, 33 around the upper end portions 32a, 33a, the both leg portions 32, 33 can be folded or extended.

  Further, the leg body 3, that is, both leg portions 32 and 33 are telescopic. Here, the first leg portion 32 will be described because the stretchable structure is equivalent. As shown in FIG. 1, the first leg portion 32 includes an upper first leg portion 321 made of a hollow material, and a lower first leg inserted into and out of the upper first leg portion 321. Part 322. As shown in FIG. 4, the upper first leg portion 321 is formed with a second slit 321a along the longitudinal direction thereof, and the guide piece 322a provided on the lower first leg portion 322 has a second shape. By being inserted into the slit 321a, the lower first leg 322 is guided in and out of the second slit 321a (the first leg 32 expands and contracts). Also, by tightening the second fixing screw 35 provided on the upper first leg 321, the lower first leg 322 is fixed and the length of the first leg 32 is set. It has become.

  Further, below the leg support portion 31 on the second beam 22 side, a wheel 36 that is rotatable about an axis (horizontal axis perpendicular to the axis of the beam 2) extending over both side portions 31a is disposed. . And in the state which folded the leg 3 to the beam 2 side, the duct cutting device 1 can be moved, rolling the wheel 36 against the floor.

  The roller body 40 is disposed on the beam 2 and includes a plurality of rollers 4 that rotatably support the round duct 100 around its axis. That is, on the second beam 22, on the second beam 22 side above the first beam 21, on the third beam 23 side on the first beam 21, and on the third beam 23. In addition, each roller body 40 is disposed.

  Each roller body 40 includes four rollers 4, and the outer diameter of the roller 4 and the arrangement position of each roller 4 are set so as to be able to support the round duct 100 having different diameters. That is, as shown in FIGS. 1 and 5, the U-shaped roller bracket 41 is disposed on the beam 2 so that both side portions 411 thereof face each other along the longitudinal direction of the beam 2. Further, the upper edges of both side portions 411 are recessed in an arc shape, four support holes 412 are formed on the upper edge side, and the support portions 42 provided at both ends of each roller 4 are rotatably mounted in the support holes 412. Yes. As a result, the four rollers 4 extend along the longitudinal direction of the beam 2 and are rotatable about an axis parallel to the axis of the beam 2. In such an arrangement state, a part of each roller 4 protrudes from the upper edge of the both side portions 411.

  Then, as shown in FIG. 5, the positions of the support holes 412, that is, the rollers 4 are set so that a plurality of types of round ducts 100 having different diameters can be supported by at least two rollers 4. Moreover, the length of the roller 4 of each roller body 40 is set so that the round duct 100 can be appropriately supported at each arrangement position.

  Further, the roller body 40 disposed on the second beam 22 and the third beam 23 is provided with a stop plate 43 on the side portion 411 outside the roller bracket 41 (on the end side of the beam 2). It has been. That is, as shown in FIG. 6, the stop plate 43 is disposed so as to extend upward from the upper edge of the side portion 411 so that the end portion of the round duct 100 supported by the roller 4 comes into contact with the stop plate 43. It has become. Here, in FIG. 5 and FIG. 6, the shape of the side portion 411 of the roller bracket 41 is different, but any shape can be used as long as the roller 4 can be supported and the round duct 100 can be rotatably supported. There may be.

  The hole punch 5 is disposed on the beam 2 and presses against the round duct 100 supported by the roller 4 to form a start hole 100 a in the round duct 100. Specifically, a punch handle 51 that is rod-shaped and rotatable around the one end 51a, and a punch 52 that is disposed on the punch handle 51 and forms the start hole 100a, is provided. By pushing down the other end portion 51b, the punch 52 is pressed against the round duct 100 to form the start hole 100a.

  That is, below the roller 4 disposed on the second beam 22 side of the first beam 21, as shown in FIGS. 2 and 7, substantially perpendicular to the first beam 21 (cross shape). A support plate 53 extending in the vertical direction is disposed on the first beam 21, and a punch pole 54 extending perpendicularly to the end on the back side of the support plate 53 is disposed. The punch pole 54 can be folded in parallel with the beam 2 so that the lower part thereof is freely rotatable. One end 51a of the punch handle 51 is rotatably connected to a handle support portion 541 attached to the punch pole 54 so as to be movable up and down, and the punch is centered on an axis parallel to the axis of the beam 2, that is, the round duct 100. The handle 51 rotates. Here, the punch handle 51 is located above the round duct 100 and is disposed so as to cross (orthogonally) the axis of the round duct 100 in a pressed state.

  The punch handle 51 has a bow that is slightly warped upward, and has a length so that a force and torque sufficient to form the start hole 100a in the round duct 100 can be obtained by a person holding and pushing down the grip 51b. Is set. A punch 52 is detachably disposed at the center of such a punch handle 51. The shape of the punch 52 is set so as to form a start hole 100a into which a blade 631 of the cutter 6 described later can be inserted by being pressed against the round duct 100.

  The cutter 6 is arranged in the beam 2 and cuts the round duct 100 by shearing (shearing) the round duct 100 with a blade 631 inserted into the start hole 100a. Specifically, a cutter arm 61 having one end 61a connected to the beam 2 and movable, and a cutter main body 63 disposed at the other end of the cutter arm 61 for shearing are provided. The blade 631 of the cutter main body 63 is moved to a desired position.

  That is, as shown in FIG. 2, the cutter arm 61 includes a first arm 611 and a second arm 612, and one end portion 61 a of the first arm 611 is turned to an end portion in front of the support plate 53. It is extended and connected so that it can move freely. That is, in this embodiment, one end 61 a of the cutter arm 61 is connected to the beam 2 via the support plate 53. In addition, one end of the second arm 612 is rotatably connected to the other end of the first arm 611, and a holder 62 is disposed on the other end of the second arm 612. As shown in FIG. 8, the holder 62 is substantially annular, and the head of the cutter main body 63 is inserted into the ring and is detachably held.

  Since the cutter main body 63 has a configuration equivalent to that of an electric ready-made duct shear, detailed description thereof is omitted, but the whole is cylindrical and has a scissor-structured blade 631 provided on the distal end side of the head. Thus, the metal plate constituting the round duct 100 is sheared. And the circular duct 100 can be cut | disconnected by inserting the blade 631 in the start hole 100a of the round duct 100, starting the cutting device main body 63, and advancing the blade 631. Here, the cutter 6 is disposed so that the blade 631 of the cutter 6 and the punch 52 of the hole punch 5 are located on the same circumference of the round duct 100 on the beam 2.

  Next, an operation of the duct cutting device 1 having such a configuration, a method for cutting the round duct 100 by the duct cutting device 1, and the like will be described.

  First, the duct cutting device 1 is carried to the installation site of the round duct 100 and installed. That is, the length of the beam 2 is reduced to be easy to carry, the leg 3 is folded to the beam 2 side, and the duct cutting device 1 is carried to the installation site with the punch pole 54 and the cutter arm 61 folded as necessary. And the beam 2 is extended to desired length, the leg 3 is extended to the floor side, and the duct cutting device 1 is installed in the installation site.

  Next, the round duct 100 to be cut is placed on the roller body 40, and the cut portion of the round duct 100 is disposed at a position facing the punch 52 of the hole punch 5. At this time, preferably, the second beam 22 and the third beam 23 are moved so that the stop plates 43 come into contact with both ends of the round duct 100. Thereby, it is possible to prevent the round duct 100 from being displaced in the axial direction and to stably cut.

  Subsequently, the punch handle 51 of the hole punch 5 is pushed down, and the punch 52 is pressed against the round duct 100 to form the start hole 100a. Next, the cutter arm 61 is moved to insert the blade 631 into the start hole 100a, and the cutter main body 63 is activated to cut the round duct 100. At this time, by rotating the round duct 100 on the roller body 40 around its axis, the blade 631 of the cutter main body 63 is advanced and cut.

  As described above, according to the duct cutting device 1 and the cutting method thereof, the round duct 100 is placed on the roller 4, the start hole 100 a is formed in the round duct 100 by the hole punch 5, and the start hole 100 a The blade 631 of the cutter 6 is inserted and the round duct 100 is cut by shearing (shearing). Thus, since the round duct 100 is cut by shearing, no spark is generated, and there is no need to provide a surrounding. Similarly, since the start hole 100a is formed in the round duct 100 by pressing the hole punch device 5, no spark is generated. Therefore, the labor and time for providing the enclosure can be reduced. Further, since the round duct 100 supported by the roller 4 is rotatable around the axis, the round duct 100 can be easily and appropriately cut by shearing while rotating the round duct 100. As described above, according to the present invention, it is possible to easily cut the round duct 100 without generating a spark at the installation site of the round duct 100.

  On the other hand, the roller 4, the hole punch 5 and the cutter 6 are disposed on the beam 2, and the beam 2 is simply provided with the legs 3. The size and size can be reduced, and the round duct 100 can be easily carried to the installation site.

  Moreover, since the leg 3 is foldable, it can be easily carried and stored. Furthermore, since the leg body 3 can be extended and contracted, it is possible to perform the cutting operation more easily and safely by extending and contracting the leg body 3 according to the environment of the installation site and the condition of the operator.

  Further, since the beam 2 can be expanded and contracted, it is possible to perform the cutting operation more easily and safely by expanding and contracting the beam 2 according to the length of the round duct 100 and appropriately supporting the round duct 100. Become.

  Moreover, since the roller 4 is arrange | positioned so that the round duct 100 from which a diameter differs can be supported, the several round duct 100 from which a diameter differs can be cut | disconnected by the one duct cutting device 1. FIG.

  Moreover, since the start hole 100a is formed in the round duct 100 only by pushing down the holding part 51b of the punch handle 51 of the hole punch device 5, the start hole 100a can be formed easily and quickly.

  Moreover, since the blade 631 of the cutter main body 63 can be moved to a desired position by moving the cutter arm 61 of the cutter 6, it is possible to perform shearing processing more easily and safely.

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, in the above embodiment, the hole punch device 5 has a structure using the lever principle, but other structures may be used, for example, a structure in which a punch is pressed from directly above the round duct 100. Good. Further, although the beam 2 is composed of the three beams 21 to 23, it may be composed of one beam or a plurality of beams other than three.

DESCRIPTION OF SYMBOLS 1 Duct cutting device 2 Beam 3 Leg body 40 Roller body 4 Roller 5 Hole punch 51 Punch handle 51a One end part 51b Gripping part (other end part)
52 Punch 53 Support plate 54 Punch pole 6 Cutting device 61 Cutter arm 61a One end 62 Holder 63 Cutting device body 631 Blade 100 Round duct 100a Start hole

Claims (7)

A long beam,
A leg that supports the beam;
A plurality of rollers disposed on the beam and rotatably supporting a round duct about its axis;
A hole punch that is arranged in the beam and forms a starting hole in the round duct by pressing against the round duct supported by the roller;
A cutter disposed in the beam and shearing and cutting the round duct with a blade inserted into the start hole;
A duct cutting device comprising: The leg is foldable,
The duct cutting device according to claim 1. The leg is stretchable,
The duct cutting device according to any one of claims 1 and 2. The beam is telescopic,
The duct cutting device according to any one of claims 1 to 3, wherein the duct cutting device is provided. The roller is disposed so as to be able to support the round duct having a different diameter.
The duct cutting device according to any one of claims 1 to 4, wherein the duct cutting device is provided. The hole punch is
A punch handle that is rod-shaped and can be rotated around one end,
A punch disposed on the punch handle to form the start hole;
And by pressing down the other end of the punch handle, the punch is pressed against the round duct to form the start hole,
The duct cutting device according to any one of claims 1 to 5, wherein The cutter is
A movable cutter arm with one end connected to the beam;
A cutter body disposed at the other end of the cutter arm and shearing;
And moving the cutter arm to move the blade of the cutter main body to a desired position.
The duct cutting device according to any one of claims 1 to 6, wherein

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