JPH04128119U - pipe cutter - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of the present invention is to be able to easily cut the pipe without manually turning the handle, and to securely cut the flexible pipe by preventing slippage and misalignment. An object of the present invention is to provide a pipe cutter that can hold clamping pressure. [Structure] A disk 20 is provided which is selectively driven in reversible rotation and has a notch 21 for inserting a pipe that reaches the rotation center, and a flexible pipe 40 is cut into the disk by sandwiching the rotation center of the disk. A blade 22 and
A guide roller assembly 36 including a plurality of rollers arranged concentrically to fit into the trough 41 of the pipe is provided so as to be able to come into contact with and separate from it. As the disc 20 rotates, the output shaft 32 of a worm mechanism is driven by a pinion 28 that rotates on its own axis while meshing with the rack gear 29 of the housing 3, and converts the rotation of the output shaft into linear motion to drive the cutting blade. A linear motion conversion mechanism is provided to drive the guide roller assembly 22 and the guide roller assembly 36 toward and away from each other.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is suitable for flexible pipes etc. that have regular wave-like unevenness on the outer circumferential surface. This invention relates to an improvement in a pipe cutter that cuts a pipe while clamping it.

0002

[Conventional technology]

Conventional pipe cutters are rotary cutters whose position can be adjusted in the radial direction according to the outside diameter of the pipe. The pipe is clamped between the cutting blade and the guide roller, and in this state, the cutting blade is moved around the pipe. This structure cuts the pipe while rotating, and this structure is well known.

0003

[Problem that the idea aims to solve]

However, the guide roller in the conventional pipe cutter has a simple cylindrical shape. The cutting process for flexible pipes used today for indoor gas piping, etc. In the industry, the uneven and corrugated shape of the pipe surface makes it difficult for the cutting blade and guide roller to The clamping pressure of the pipe becomes unstable, and the pipe slips during work, causing the cutting position to shift. The inventor of the present invention has discovered that there is a possibility that cutting may not be possible.

0004 In addition, conventional pipe cutters do not rotate the cutting blade around the pipe when cutting the pipe. In order to slow down the cutting process, you must manually turn the handle that holds the cutting blade at the center of rotation. Individuals who cannot do this. Moreover, rotate the cutting blade with it biting into the pipe. Therefore, existing piping, such as piping fixed to a wall or buried When cutting part of a pipe, make sure that equipment or structures near the pipe are cut off by the pipe cutter. The handle often gets in the way when turning the handle, making it difficult to cut efficiently. There was a problem.

[0005] The purpose of this invention is to cut flexible pipes under clamping pressure using a cutting blade and a guide roller. Safely protects flexible pipes by preventing them from slipping or shifting when cutting. An object of the present invention is to provide a pipe cutter that can be held constant. In addition, this invention Another purpose of the In addition, the pipe can be easily cut without having to turn the handle like before. At the same time, it is possible to securely hold the flexible pipe under pressure by preventing it from slipping or shifting. The purpose of the present invention is to provide a pipe cutter that can do the following.

[0006]

[Means to solve the problem]

The pipe cutter of this invention is designed to maintain stable clamping pressure for flexible pipes. Standing on the floor, hold the pipe cutting blade and the regular wave pattern in opposite positions, sandwiching the pipe Multiple rollers that fit into the troughs of a flexible pipe that has an uneven shape on its outer periphery. The main structure is that the guide roller assembly is movable in the axial direction and can be moved toward and away from the guide roller assembly. body.

[0007] The above configuration can also be applied to pipe cutters whose housings are manually rotated. Can be done. Furthermore, when the cutting operation is driven by power, the power can selectively rotate forward and reverse. A disk is provided with a pipe insertion portion that reaches the center of rotation while being rotated. The disc is inserted into the pipe insertion part by sandwiching the rotating center of the disc. A pipe cutting blade and a plurality of rollers that fit into the valleys of the flexible pipe are installed at the same time. A guide roller assembly arranged centrally is provided so as to be able to come into contact with and be separated from the guide roller assembly. The drive source is a rotating body that revolves around the periphery of the housing as the rotation of the housing rotates. The output shaft of the worm mechanism is connected to the cutting blade and the gas by converting the rotation of the output shaft into linear motion. Adopts a structure with a linear motion conversion mechanism that drives the idle roller assembly toward and away from each other. do.

[0008] Furthermore, power transmission from the peripheral portion of the housing to the rotating body is achieved by friction-based rotation. Although it may be a contact type, in order to further ensure power transmission, the rotating body may be a pinion, and a first rack that meshes with the pinion is provided at the peripheral edge of the housing. It is good to form a gear. At this time, the cut communicating with the pipe insertion portion of the housing is A second rack gear is provided in the cutout portion to form an annular rack gear together with the first rack gear. The rack gear piece that forms the rack gear is provided so that it can be opened and closed, and the pinion and rack gear Always guarantees a state of engagement with the

[0009]

[Effect]

When the flexible pipe is held between the guide roller assembly and the cutting blade, the guide The multiple rollers that make up the drawer assembly fit into the valleys of the flexible pipe. , regulates the axial movement of the flexible pipe, and allows the cutting blade to move around the flexible pipe. Even when rotating in contact with the outer circumference, the flexible pipe may slip against the cutting blade. Prevent the position from shifting.

0010 In power-driven structures, insert the pipe into an existing or unpiped pipe. When the disc is inserted and started and the disc is driven to rotate, the rotation supported on the disc The cutting blade rotates around the pipe and gradually approaches the pipe as the disc rotates. The pipe is supported by the rotating cutting blade and the guide roller assembly. Friends In the case of flexible pipes, each roller of the guide roller assembly is flexible. Fits into the valley of the pipe. As the disc continues to rotate, the cutting blade will cut into the pipe. The rotating cutting blade revolves around the same circumference and bites into the pipe, and the rotating cutting blade penetrates in the centripetal direction of the pipe. Enter and cut the pipe.

[0011]

【Example】

In FIG. 1, 1 includes a reversible drive source (not shown) such as an electric motor. The handle is equipped with a base housing 2 at its tip. A cover housing 3 is fixed to the tag 2.

0012 A worm gear 6 is fixed to a drive shaft 5 protruding from the tip of the handle 1. The drive shaft 5 is supported perpendicularly to the drive shaft 5 by a worm wheel 7 that meshes with the drive shaft 5. The rotation of the drive shaft 5 is transmitted to the idle shaft 4.

[0013] The idle shaft 4 is connected to the base housing 2 and the cover housing 3 by the base housing 2 and the cover housing 3. The idle shaft 4 has a spur gear concentrically with the worm wheel 7. 8 is fixed, and two spur gears 9 and 10 are meshed with this spur gear 8, respectively. It is shown. 12 and 13 are shafts that individually support spur gears 9 and 10. 11 is A ratio provided in the base housing 2 so as to mesh with both of the spur gears 9 and 10. It is a spur gear with a relatively large number of teeth. 14 is base housing 2 and cover housing The front and back surfaces of the large-diameter spur gear 11 interposed between the abutting surfaces of the gear 3 have a low coefficient of friction. This is a ring made of hardened steel that provides support.

[0014] The spur gear 11 has a diameter that corresponds to the maximum diameter of the flexible pipe 40 that can be cut. The pipe is of a suitable size and is designed to guide the pipe to the center of rotation of the spur gear 11. A roughly U-shaped notch 15 is formed that is large enough to reach the center of rotation of the (see Figure 3), and the base housing 2 and cover housing 3 are also Notches 16 and 17 (see FIGS. 1 and 3) of the same size are formed.

[0015] In FIG. 1, 20 is a disk fixed on the spur gear 11 and a cover. - It rotates along the inner peripheral surface of the housing 3, and this disc 20 also has a Similar to the spur gear 11, a notch 21 for inserting a pipe is formed. 22 is A circular cut rotatably supported by a holder 24 at an eccentric position of the disk 20 It is a blade that fits into a straight groove 23 formed on the surface of the disk 20, as shown in FIG. It is supported by a holder 24 that is fitted and slides, and is positioned relative to the center of rotation of the disk 20. It is provided so that it can come into contact with and separate from it. Note that the holder 24 stands on the side of the disk 20. It is covered with a cover 35 fixed horizontally by two posts 34, 34 provided. This prevents the rotary cutting blade 22 from falling off the straight groove 23. Prevents unnecessary exposure.

[0016] 27 is a bracket 25 in a direction perpendicular to the moving direction of the rotary cutting blade 22 toward and away from the rotary cutting blade 22; 25, and a pinion 28 is fixed to the end of this shaft 27. The pinion 28 is connected to a second pinion formed on the peripheral surface of the cover housing 3. 1 rack gear 29. In addition, a worm wheel is provided at the middle part of the rotating shaft 27. A worm wheel 30 is provided to rotate a worm gear 31 that meshes with the worm wheel 30. A male is provided perpendicularly to the rotating shaft 27 and formed integrally and concentrically with the worm gear 31. The screw 32 is fitted into the female thread of the holder 24 to stop the rotation of the pinion 28. It is now possible to convert the cutting blade 22 into a linear motion of the holder 24 that supports it. There is. Therefore, for example, when the disk 20 rotates in the direction of arrow R in FIG. The cutting blade 22 gradually moves in the direction D in the figure, approaches its rotation center, and rotates the disk 20. When reversed in the L direction, the cutter 22 moves in the U direction and away from its center of rotation. Ru.

[0017] A pipe is located at a position facing the rotary cutting blade 22 across the center of rotation of the disk 20. The position of the guide roller assembly 36 that contacts the outer peripheral surface of the roller at multiple points can be adjusted using screws 43. It is set in Noh. This guide roller assembly 36, as shown in FIG. For example, a shape with a medium-high outer circumference (the diameter is relatively large in the center) such as a Soroban bead shape. A plurality of rollers 39A, 39B, 39C having a shape) are inserted into the shaft 38 of the holder 37. They are configured to be movable in the axial direction with a small gap. Said b The guide roller assembly 36 composed of rollers 39A, 39B, and 39C is shown in FIG. As shown in the figure, a total of two sets are provided on the left and right sides. The rollers 39A, 39B, 39C bites into the valley 41 of the flexible pipe 40 and the flexible pipe 4 0 is locked and the flexible pipe 40 is inserted into the pipe insertion part 15. to prevent it from shifting in the axial direction of the pipe. The rollers 39A, 39B, 39C The angle θ is determined by taking into account the standard of the undulating shape of the outer circumference of the flexible pipe 40. For example, the angle is set to 60°, so that the outer periphery of the flexible pipe 40 is not easily deformed. There is. Further, the rollers 39A, 39B, and 39C are movable in the axial direction. Therefore, the pitch of the peaks and valleys differs depending on the diameter of the flexible pipe 40. It is designed so that it can be smoothly inserted into the trough 41 and locked even when There is. The holder 37 of the guide roller assembly 36 is formed on the surface of the disk 20. The pipe is slidably fitted in the straight groove 42 of the disk 20 in the radial direction. After determining the fixing position according to the outer diameter of the There is. Note that the pipe supported by the guide roller assembly 36 is a flexible pipe 40. However, it is possible to support simple cylindrical pipes with no unevenness on the outer circumferential surface. It's no good. Incidentally, FIG. 5 shows an example of the flexible pipe 40. Then, the dimensions of inner diameter di = 11.5 mm, outer diameter do = 14.2 mm, and thickness t = 0.2 mm are taken. have.

[0018] In FIG. 2, 41 is a sensor that detects the retreating position of the cutting blade holder 24; On the other hand, when the holder 24 retreats in the direction U in the figure and comes into contact with it, the reversible drive (not shown) The power source is stopped, and the rotary cutting blade 22 is placed on standby prior to cutting the pipe. are the notch 15 of the spur gear 11, the notch 21 of the disk 20, and the housing. The notches 16 and 17 of the rings 2 and 3 are brought into communication as shown in FIG.

[0019] The pipe insertion notch 17 of the cover housing 3 has a notch 17. A rack having a second rack gear 45A to compensate for the missing rack gear due to A gear piece 45 is pivotally supported by a pin 46 so that it can be opened and closed. This rack gear piece 45 is an example. It is biased in the closing direction by the twisted coil spring 47, and when closed, the above-mentioned The first rack gear 29 constitutes an annular rack gear, and the pinion 28 and the rack gear Guarantees engagement at any position. Insert the flexible pipe 40 into the notch. When inserting, pull the rack gear piece 45 against the biasing force of the torsion coil spring 47. Just open it up.

[0020] Next, the operation of the above embodiment will be explained.

[0021] When cutting the flexible pipe 40, first rotate the rotational drive source in reverse. Place the cutting blade 22 in the standby position. In this case, when the rotational drive source is reversed, its rotation is decelerated and transmitted from the drive shaft 5 to the spur gear 11, and the disc 20 moves in the direction of arrow L. Rotate in the direction. The rotation of the disk 20 causes the pinion 28 to connect to the first rack gear 29. This rotation is decelerated by the worm wheel 30 and the worm 31. , the holder 24 screwed into the male screw 32 directly connected to the worm 31 is inserted into the straight groove 22. along arrow U direction. In this way, the holder 24 is retracted and the sensor 41, the reverse rotation of the rotary drive source is stopped. In this state, the spa - The notch part of the gear 11, the pipe insertion part 15, and the notch part 21 of the disk 20 are Notches 16 and 17 formed in the base housing 2 and cover housing 3, respectively The flexible pipe 40 can be inserted into both of the pipes, and the rotary cutting can be carried out. The blade 22 is retracted to a position where it is not exposed from the notch 21.

[0022] After preparing for cutting in this way, cut out the cutout part of the pipe cutter into a flexible Insert the roller 39A of the guide roller assembly 36 into the cutting position of the cible pipe 40. , 39B, and 39C into the trough 41 of the flexible pipe 40, and hold the handle 1 by hand. While supporting it, drive the rotational drive source in normal rotation. For forward rotation of the rotational drive source, the disk 20 is rotated in the direction of arrow R, and the pinion 28 is connected to the first rack gear 29 and the second rack gear. It rolls in the opposite direction on the worm 45A and is screwed into the male thread 32 of the worm 31. The holder 24 is gradually advanced along the straight groove 22 in the direction of arrow D. in this way While the rotary cutting blade 22 moves forward, the cutting blade 22 cuts around the pipe 40. Since it rotates together with the disc 20, the cutting edge of the rotary cutting blade 22 is attached to the flexible pipe 4. 0, the rollers 39A of the two guide roller assemblies 36 at their symmetrical positions , 39B, and 39C, the flexible pipe 40 is in a three-point supported state and is stable. The cutting edge of the rotary cutting blade 22 gradually moves toward the flexible pipe 40 while being supported by the flexible pipe 40. It bites in on the same circumference of the holder 24, and the amount of biting gradually decreases as the holder 24 advances. Then, the pipe 40 is cut. At this time, the guide roller assembly 36 is The rollers 39A, 39B, and 39C bite into the valleys 41 of the flexible pipe 40. When cutting with the cutting blade 22, the rotational torque of the cutting blade 22 causes a flexible Even if an axial force is applied to the pipe 40, the pipe does not shift from its clamping support position.

[0023] After cutting the pipe, reversely rotate the rotary drive source as described above and remove the holder 2. 4 and return the rotary cutting blade 22 to the standby position.

[0024] Although the present invention has been explained above based on the embodiments, the present invention is not limited to the above embodiments. Various changes may be made without departing from the spirit of the invention. For example, a pipe cutting blade 22 is not limited to a freely rotating circular cutter, but also has a structure in which a curved blade is fixed to a holder. It may be constructed. Furthermore, in the above embodiment, regarding cutting of the flexible pipe, However, it is also applicable not only to this but also to ordinary cylindrical pipes. Not even. In addition, the linear motion conversion mechanism directly connected to the worm mechanism Even if the structure does not utilize a screw-fitting mechanism, for example, it is possible to Engage the sector gears and connect the swinging end of the sector gear and the cutting blade or its holder. They may be connected to linearly displace the cutting blade. Also, in the above example explained using a power-driven pipe cutter as an example, but a conventional manually operated type It can also be applied to pipe cutters, in which case traditional cylindrical guide rollers can be used. A guide roller assembly may be used instead of the roller.

[0025]

[Effect of the idea]

The pipe cutter of the present invention is designed to cut the pipe at positions opposite to each other by sandwiching the pipe insertion part. Fits into the valley of a flexible pipe that has a cutting edge and a regular wave-like uneven shape on the outer periphery. The guide roller assembly, which has multiple rollers movable in the axial direction, can be connected to and separated from the guide roller assembly. Because it has a structure that allows it to be easily flexed, it does not flex when the cutting blade and guide roller assembly are clamped together. Prevents the pipe from slipping or shifting in the axial direction when cutting the flexible pipe. This allows the flexible pipe to be held at the desired location. It is possible to cut the flexible pipe accurately and prevent deformation of the cut flexible pipe. It has the effect of being able to prevent children.

[0026] In addition, the cutting blade is rotated by power drive, and the cutting blade is guided in synchronization with this. By adopting a mechanism that moves the handle closer to the drawer assembly, the handle can be moved manually. You can easily cut the pipe without turning it, and it does not require a large amount of force to cut. First, it has the effect of making it easier to cut existing piping.

[0027] A shape is formed on the periphery of the housing as a power transmission means for revolving the cutting blade. The system uses a combination structure of a rack gear that has been formed and a pinion that meshes with the rack gear. This has the effect that the power can be transmitted reliably.

[0028] In addition, the number of rollers that make up the guide roller assembly is small, but Because it can be moved, uneven waves can be created depending on the diameter of the flexible pipe. Smoothly handles various types of flexible pipes with different pitches between the peaks and valleys of the mold shape. The effect is that the pipe can be locked by inserting a roller into the valley of the same pipe. There is.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway plan view of the main parts of a pipe cutter according to an embodiment of the present invention.

FIG. 2 is a side view of the main parts of the pipe cutter with a part of the cover removed.

FIG. 3 is a side view showing a disk rotation drive system.

FIG. 4 is a cross-sectional view of the guide roller assembly.

FIG. 5 is an explanatory diagram showing a flexible pipe.

[Explanation of symbols]

1 Handle 2 Base housing 3 Cover housing 11 Spur gear 15 to 17 Notch part 20 discs 21 Notch part 22 Cutting blade 23 Straight groove 28 pinion 29 1st rack gear 30 Worm gear 31 Worm wheel 32 Male thread 36 Guide roller assembly 39A, 39B, 39C roller 40 Flexible pipe 45 Rack gear piece 45A 2nd rack gear

Claims (3)

[Scope of utility model registration request] 1. A flexible pipe that is provided with a pipe insertion portion reaching from the outside to the center of the housing, and that has a pipe cutting blade and a regular wave-like uneven shape on the outer periphery at opposing positions sandwiching the pipe insertion portion. A pipe cutter comprising a guide roller assembly in which a plurality of rollers that fit into the valleys of the pipe are movable in the axial direction. 2. A disk that is selectively rotated forward and backward by power and has a pipe insertion portion that reaches the center of rotation; A cutting blade for the pipe to be cut,
A guide roller assembly including a plurality of concentrically arranged rollers that fit into the valleys of a flexible pipe having a regular wave-like uneven shape on the outer periphery is provided so as to be able to come into contact with and separate from the guide roller assembly. The output shaft of a worm mechanism whose drive source is a rotating body that rotates while revolving around its axis, converts the rotation of the output shaft into linear motion to drive the cutting blade and the guide roller assembly toward and away from each other relative to each other. A pipe cutter equipped with a linear motion conversion mechanism. 3. The rotating body is a pinion, the housing has a first rack gear on its peripheral edge that meshes with the pinion, and the first rack gear is provided in a notch portion of the housing that communicates with the pipe insertion portion. 3. The pipe cutter according to claim 2, further comprising a rack gear piece which can be opened and closed, and which together form a second rack gear to form an annular rack gear.