JP2585096Y2 - Pipe cutter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a pipe cutter of a type in which a pipe such as a flexible pipe having a regular corrugated shape on the outer peripheral surface is cut while being pressed.

[0002]

2. Description of the Related Art In a conventional pipe cutter, a pipe is clamped by a rotary cutting blade and a guide roller which can be adjusted in a radial direction in accordance with an outer diameter of the pipe. In this state, the cutting blade revolves around the pipe. While cutting the pipe, and this structure is well known.

[0003]

However, the guide roller in the conventional pipe cutter has a simple cylindrical shape, and the cutting operation of a flexible pipe used for indoor gas pipes and the like today requires an uneven corrugated surface of the pipe. The present inventor has found that, depending on the shape, the state in which the pipe is pressed by the cutting blade and the guide roller becomes unstable, and the pipe may slip during the work and the cutting position may be shifted or may not be cut.

Further, in the conventional pipe cutter, since the cutting blade revolves around the pipe at the time of cutting the pipe, the cutting operation cannot be performed unless the handle having the cutting blade at the center of rotation is manually turned. . In addition, since the cutting blade must be rotated with the cutting blade cut into the pipe, the existing pipe, for example, when cutting a part of the pipe fixed to the wall or buried pipe, close to the pipe There is a problem that a certain facility or structure often hinders the turning of the handle of the pipe cutter, and it is difficult to perform an efficient cutting operation.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pipe cutter which can prevent slippage and displacement of a flexible pipe when the flexible pipe is cut while being pressed by a cutting blade and a guide roller, thereby stably holding the flexible pipe. Is to provide. Another object of the present invention is to cut a pipe without requiring extraordinary force, and to easily cut a pipe without turning a handle as in the past. It is another object of the present invention to provide a pipe cutter capable of securely holding a flexible pipe while holding a flexible pipe while preventing slippage and displacement.

[0006]

SUMMARY OF THE INVENTION A pipe cutter according to the present invention is provided with a cutting blade of a pipe, a cutting edge of a pipe, and an opposing position across a portion into which a pipe is inserted, from the viewpoint of stable pressure holding of a flexible pipe. And a guide roller assembly in which a plurality of rollers that fit into the valleys of a flexible pipe having a typical corrugated shape on the outer periphery are provided so as to be able to move in the axial direction so as to be capable of coming and going.

In order to make the cutting operation power-driven, the disk is provided with a notch for pipe insertion which is selectively rotated forward and reverse by power and reaches the center of rotation. On the disc, a plurality of cutting blades of a pipe inserted into the notch and a plurality of rollers that fit into a valley of a flexible pipe having a regular corrugated irregular shape on the outer periphery are concentrically arranged on the disk. An output of a worm mechanism using a rotating body as a drive source, the guide being provided with a guide roller assembly so as to be capable of coming and going, and a rotating body that revolves around the periphery of the housing while rotating by contacting the periphery of the housing in accordance with the rotation of the disk. The shaft is provided with a linear motion conversion mechanism that converts the rotation of the output shaft into linear motion and relatively drives the cutting blade and the guide roller assembly toward and away from each other.

Further, the power transmission from the peripheral portion of the housing to the rotating body may be of a rolling contact type by friction. However, in order to further ensure the power transmission, the rotating body is a pinion, and A first rack gear that meshes with the pinion may be formed on a peripheral portion of the housing. At this time, a rack gear piece forming a second rack gear for forming an annular rack gear together with the first rack gear is provided in the notch portion for pipe insertion of the housing so as to be openable and closable, and a meshing state between the pinion and the rack gear is established. Always guaranteed.

[0009]

When the flexible pipe is held by the guide roller assembly and the cutting blade, a plurality of rollers constituting the guide roller assembly are fitted into the valleys of the flexible pipe to restrict the axial movement of the flexible pipe. However, even when the cutting blade is revolved in contact with the outer periphery of the flexible pipe, the flexible pipe is prevented from slipping or displacing with respect to the cutting blade.

When a notch for inserting a pipe is fitted into an existing or unpiped pipe and started, and the disk is driven to rotate, the rotary cutting blade supported on the disk rotates around the pipe, As the disk rotates, the pipe is gradually approached to the pipe, and the rotary cutting blade and the guide roller assembly support the pipe. In the case of a flexible pipe, each roller of the guide roller assembly fits into a valley of the flexible pipe. Subsequently, when the disc is rotated, the cutting blade revolves on the same circumference of the pipe and bites into the pipe, and the rotating cutting blade penetrates in the centripetal direction of the pipe and cuts the pipe.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 denotes a handle having a built-in reversible drive source (not shown) such as an electric motor. The housing 3 is fixed.

A drive shaft 5 protruding from the tip of the handle 1
A worm gear 6 is fixed to the drive shaft 5, and the rotation of the drive shaft 5 is transmitted to an idle shaft 4 supported in a state orthogonal to the drive shaft 5 by a worm wheel 7 meshing with the worm gear 6.

The idle shaft 4 is supported by the base housing 2 and the cover housing 3. A spur gear 8 is fixed to the idle shaft 4 concentrically with the worm wheel 7. The spur gears 9 and 10 are engaged with each other. 12 and 13 are shafts for individually supporting the spur gears 9 and 10. Reference numeral 11 denotes a spur gear having a relatively large number of teeth provided in the base housing 2 so as to mesh with both the spur gears 9 and 10. Reference numeral 14 denotes a ring made of quenched steel for supporting the front and back surfaces of the large-diameter spur gear 11 with a low friction coefficient, interposed between the abutting surfaces of the base housing 2 and the cover housing 3.

The spur gear 11 has a size commensurate with the maximum diameter of the flexible pipe 40 that can be cut, and has a size that reaches the rotation center of the spur gear 11 in order to guide the pipe to the center of rotation. A U-shaped notch 15 is formed (see FIGS. 1 and 3). Similarly, notches 16 and 17 of the same size are formed in the base housing 2 and the cover housing 3 (see FIGS. 1 and 3). Are formed.

In FIG. 1, reference numeral 20 denotes the spur gear 1;
1 is a disk fixed on the disk 1 and rotates along the inner peripheral surface of the cover housing 3. The disk 20 has a notch 2 for inserting a pipe similarly to the spur gear 11.
1 is formed. Reference numeral 22 denotes a circular cutting blade (also referred to as a rotary cutting blade) rotatably supported by the holder 24 at an eccentric position of the disk 20, and as shown in FIG.
The disk 20 is supported by a holder 24 which is fitted and slid in a linear groove 23 formed on the surface of the disk 20.
It is provided so as to be in contact with and separated from the rotation center of.
The cover 24 is horizontally fixed by two posts 34, 34 erected on the side surface of the disk 20.
5 prevents the rotary cutting blade 22 from unnecessarily exposing the rotary cutting blade 22 at the same time.

Reference numeral 27 denotes a rotating shaft supported by brackets 25, 25 in a direction orthogonal to the direction of movement of the rotary cutting blade 22. The shaft 27 has a pinion 28 at its end.
The pinion 28 is fixed to the cover housing 3.
Meshes with the first rack gear 29 formed on the surface of the peripheral portion of the first rack gear 29. A worm wheel 30 is provided at an intermediate portion of the rotary shaft 27. A worm gear 31 meshing with the worm wheel 30 is provided orthogonal to the rotary shaft 27, and a male screw 32 formed concentrically with the worm gear 31 integrally.
Into the female screw of the holder 24, and the pinion 28
Can be converted into a linear motion of a holder 24 that supports the rotary cutting blade 22. Therefore, for example, when the disk 20 rotates in the direction of arrow R in FIG. 2, the rotary cutting blade 22 gradually moves in the direction D in FIG. 2 to approach the center of rotation, and when the disk 20 is rotated in the direction L, the cutter 22 It moves in the U direction and moves away from its center of rotation.

At a position facing the rotary cutting blade 22 with respect to the center of rotation of the disk 20, a guide roller assembly 36 which comes into contact with the outer peripheral surface of the pipe at a plurality of positions is provided so that the position can be adjusted by screws 43. This guide roller assembly 36
As shown in FIG. 4, a plurality of rollers 39A, 39B, and 39C having a middle and high outer peripheral shape (a shape having a relatively larger diameter toward the center) such as a soloban ball shape are attached to the shaft 38 of the holder 37. They are inserted and provided so that they can be moved in the axial direction with a small gap. The roller 3
As shown in FIG. 2, a total of two sets of guide roller assemblies 36 composed of 9A, 39B and 39C are provided on the left and right. The rollers 39A, 39B, 39C bite into the valleys 41 of the flexible pipe 40 to lock the flexible pipe 40, and the spur gear 11 and the disc 20
The cutting position of the flexible pipe 40 inserted into the rotation center of the pipe is not shifted in the axial direction of the pipe. The angle θ of the rollers 39A, 39B, 39C is set to, for example, 60 ° in consideration of the standard of the corrugated shape of the outer periphery of the flexible pipe 40, so that the outer periphery of the flexible pipe 40 is hardly deformed. The roller 39
Since A, 39B, and 39C are movable in the axial direction, even when the pitch between the peaks and the valleys differs depending on the diameter of the flexible pipe 40, the A, 39B, and 39C smoothly fit into the valley portion 41 and engage. It is considered so that it can be stopped. The holder 37 of the guide roller assembly 36
Is slidably fitted in the radial groove 42 of the disk 20 in the radial direction of the disk 20, determines the fixing position according to the outer diameter of the pipe, and is fixed by the screw 43. I have. It should be noted that the pipe supported by the guide roller assembly 36 is not limited to the flexible pipe 40, and it is needless to say that a simple cylindrical pipe having no irregularities on the outer peripheral surface can be supported. FIG. 5 shows an example of the flexible pipe 40, which has dimensions of an inner diameter di = 11.5 mm, an outer diameter do = 14.2 mm, and a thickness t = 0.2 mm.

In FIG. 2, reference numeral 44 denotes a sensor for detecting the retreat position of the cutting blade holder 24. On the other hand, when the holder 24 retreats in the U direction in FIG. Prior to the cutting of the pipe, the rotary cutting blade 22 is made to stand by. On the other hand, the notch 15 of the spur gear 11, the notch 21 of the disk 20, and the notches 16 and 17 of the housings 2 and 3 are moved to FIG. To the state shown in (1).

A notch 17 for pipe insertion of the cover housing 3 pivotally supports a rack gear piece 45 having a second rack gear 45A for supplementing a rack gear missing by the notch 17 so as to be opened and closed by a pin 46. I have.
The rack gear piece 45 is, for example, a torsion coil spring 4.
7, the ring gear is formed in an annular rack gear together with the first rack gear 29 at the time of closing to ensure the meshing between the pinion 28 and the rack gear at any position. When inserting the flexible pipe 40 into the notch, the rack gear piece 45 may be opened against the urging force of the torsion coil spring 47.

Next, the operation of the above embodiment will be described.

When cutting the flexible pipe 40, first, the rotary drive source is reversed and the rotary cutting blade 22 is placed at the standby position. In this case, when the rotation drive source is reversed, the rotation is reduced and transmitted from the drive shaft 5 to the spur gear 11, and the disk 20 rotates in the arrow L direction. Disc 2
The rotation of the pinion 28 rolls on the first rack gear 29 by the rotation of 0, and the rotation is reduced by the worm wheel 30 and the worm 31, and the holder 24, which is screw-fitted to the male screw 32 directly connected to the worm 31, follows the linear groove 22. To displace in the direction of arrow U. When the holder 24 retreats and comes into contact with the sensor 44 in this manner, the reverse rotation of the rotary drive source stops. In this state, the notch 15 of the spur gear 11 and the notch 21 of the disc 20 communicate with the notches 16 and 17 formed in the base housing 2 and the cover housing 3, respectively, and the flexible pipe 40 is inserted therein. As a result, the rotary cutting blade 22 retreats to a position where it is not exposed from the notch 21.

After the cutting posture is adjusted in this manner, the cutouts 15, 16, 1 of the connected pipe cutter are formed.
7, 21 are inserted into the cutting position of the flexible pipe 40, and the rollers 39A, 39B,
39C is fitted into the valley 41 of the flexible pipe 40,
The rotation drive source is driven to rotate forward while holding the handle 1 by hand. The forward rotation of the rotation drive source rotates the disk 20 in the direction of arrow R, and the pinion 28 is connected to the first rack gear 29 and the second rack gear 29.
Rolling on the rack gear 45A in the opposite direction, the holder 24 screwed to the male screw 32 of the worm 31 is gradually advanced in the direction of arrow D along the straight groove 22. While the rotary cutting blade 22 advances in this manner, the cutting blade 2
2 rotates around the pipe 40 together with the disk 20, so that when the cutting edge of the rotary cutting blade 22 abuts on the flexible pipe 40, at the symmetrical position, together with the rollers 39 A, 39 B, 39 C of the two guide roller assemblies 36, 3. While the flexible pipe 40 is stably pinched and supported in the point support state, the cutting edge of the rotary cutting blade 22 gradually bites on the same circumference of the flexible pipe 40, and the holder 24
The pipe 40 is cut by gradually increasing the bite amount with the advance of the pipe. At this time, the guide roller assembly 3
6, the roller 39A, 39B, 39C bites into the valley portion 41 of the flexible pipe 40. Therefore, even if an axial force is applied to the flexible pipe 40 via its rotational torque or the like at the time of cutting by the cutting blade 22, the pipe is not cut. The clamping support position is not shifted.

When the cutting of the pipe is completed, the rotary drive source is rotated in the reverse direction as described above, the holder 24 is retracted, and the rotary cutting blade 22 is returned to the standby position.

As described above, the present invention has been described based on the embodiments. However, the present invention is not limited to the above embodiments, and can be variously modified without departing from the gist thereof. For example, the cutting blade 22 of the pipe is not limited to a circular cutter that rotates freely, and may have a structure in which a curved blade is fixed to a holder. Also,
In the above-described embodiment, cutting of the flexible pipe is described. However, it is needless to say that the present invention is not limited to this and can be applied to an ordinary cylindrical pipe. Also, the linear motion conversion mechanism directly connected to the worm mechanism, for example, meshes a sector gear that can swing to the worm even if the structure does not use a screw fitting mechanism that is directly connected to the worm, and is connected to the swing end of the sector gear. The cutting blade or its holder may be connected to linearly displace the cutting blade. In the above embodiment, the power driven type pipe cutter is described as an example.However, the present invention can also be applied to a conventional manually operated type pipe cutter, in which case, instead of the conventional cylindrical guide roller. A guide roller assembly may be employed.

[0025]

The pipe cutter according to the present invention comprises a pipe cutting blade and a roller which is fitted into a valley of a flexible pipe having a regular corrugated irregular shape on the outer periphery thereof at a position opposed to the pipe insertion portion. Since a plurality of guide roller assemblies movably provided in the axial direction are provided so as to be able to contact and separate from each other, the flexible pipe is cut when the flexible pipe is cut with the cutting blade and the guide roller assembly pressed. Can be prevented from slipping and misalignment in the axial direction of the flexible pipe, thereby stably holding the flexible pipe. Thus, a desired portion of the flexible pipe can be cut accurately, and deformation of the cut flexible pipe can be prevented. There is an effect that it can be prevented.

Further, by adopting a mechanism for revolving the cutting blade by power drive and moving the cutting blade closer to the guide roller assembly in synchronization with this, the pipe can be rotated without manually turning the handle. Can be easily cut, and there is an effect that cutting of existing pipes and the like becomes easy without requiring a large force for cutting.

As the power transmission means for revolving the cutting blade, a combined structure of a rack gear formed on the periphery of the housing and a pinion meshing with the rack gear is employed, so that the power can be transmitted reliably. This has the effect.

Further, since the plurality of rollers constituting the guide roller assembly are slightly movable in the axial direction, the peaks and valleys of the corrugated shape are formed according to the diameter of the flexible pipe. There is an effect that the rollers can be smoothly fitted into the valleys of the pipes to lock the pipes even for various kinds of flexible pipes having different pitches.

[Brief description of the drawings]

FIG. 1 is a plan view of a partially cut-away main part of a pipe cutter according to an embodiment of the present invention.

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

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

FIG. 4 is a sectional view of a guide roller assembly.

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

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 handle 2 base housing 3 cover housing 11 spur gear 15 to 17 notch portion 20 disk 21 notch portion 22 cutting blade 23 linear groove 28 pinion 29 first rack gear 30 worm gear 31 worm wheel 32 male screw 36 guide roller assembly 39A, 39B, 39C Roller 40 Flexible pipe 45 Rack gear piece 45A Second rack gear

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B23D 21/00 B23D 21/00 510

Claims (2)

(57) [Scope of request for utility model registration] 1. A disk having a notch for inserting a pipe reaching a center of rotation while being selectively rotated forward and backward by power, and having the disk with the center of rotation of the disk interposed therebetween, The cutting blade of the pipe inserted into the notch and the guide roller assembly in which a plurality of rollers that fit into the valley of a flexible pipe having a regular corrugated uneven shape on the outer periphery are concentrically arranged can be separated and separated. The rotation of the output shaft is linearly connected to the output shaft of a worm mechanism that uses a rotating body as a drive source that revolves around the periphery of the housing while in contact with the periphery of the housing as the disk rotates. A pipe cutter provided with a linear motion converting mechanism for converting the cutting blade into a motion and relatively driving the cutting blade and the guide roller assembly toward and away from each other. 2. A part of a peripheral edge of the housing is cut off by another pipe insertion notch portion that can communicate with a pipe insertion notch portion formed in the disk, and the rotating body is a pinion. The housing has a first rack gear meshing with the pinion on a peripheral portion thereof, and a cut-out portion of the housing for inserting a pipe constitutes an annular rack gear by interpolating a missing portion of the first rack gear. 2. The pipe cutter according to claim 1, wherein a rack gear piece on which a second rack gear is formed is provided so as to be openable and closable.