JPH063519U - Pipe cutter - Google Patents

Abstract

(57) [Summary] The pipe 14 elastically deforms as it is pressed by the receiving rollers 20, 22 and the roller blade 28, so that the roller blade 28 is extended over a predetermined cutting range L of the pipe 14 with respect to the pipe 14. A coil spring 82 that continuously feeds the pipe 14 is provided. [Effect] Since it is sufficient to press the pipe 14 between the receiving rollers 20 and 22 and the roller blade 28 once and continuously rotate the pipe cutter 10 until the pipe 14 is cut, the pipe cutting work can be performed. It becomes easy and the work efficiency is greatly improved. Further, it is possible to solve the problem that the manual feed amount by the screwing device is too large to cause defective products due to the deformation of the pipe, and conversely it is too small to further reduce the cutting work efficiency by the pipe cutter.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe cutter for cutting a pipe.

[0002]

[Prior art]

 A main body having a recess for receiving the pipe, a receiving roller provided on the main body so as to come into contact with the outer peripheral surface of the pipe to receive the pipe, and a side of the outer peripheral surface of the pipe opposite to the position contacting the receiving roller. And a roller blade provided on the main body of the pipe at the position of, and at the time of cutting, the pipe is clamped between the receiving roller and the roller blade and the main body is rotated relative to the pipe. The cutter is known. The roller blade or the support roller is configured to be fed by a screwing device in a direction in which they are relatively close to each other, and the roller blade is bited into the pipe in accordance with the manual operation of the screwing device. It has become. For example, it is a pipe cutter specified in JIS B 4646.

[0003]

[Issues to be solved by the device]

 By the way, in the conventional pipe cutter described above, for example, each time the pipe cutter makes one rotation with respect to a fixed pipe, the screwing device is manually rotated to increase the cutting depth of the roller blade by a predetermined amount. And the operation is repeated until the pipe cut is completed. For this reason, in the past, the pipe cutting operation was cumbersome and inefficient. Also, manual rotation of the screwing device requires skill, and if the manual feed amount by the screwing device is too large, it is easy to cause defective products due to deformation, especially with soft metal pipes. There was a drawback that the number of rotations up to the cutting of the cutter increased and the work efficiency further decreased.

Further, as described in Japanese Patent Publication No. 63-33963, in a pipe cutter of a type in which a main body provided with a roller blade and a receiving roller is driven to rotate around a pipe by a motor, Since the mechanism that feeds the roller blade by a predetermined amount per revolution is complicated, the number of parts is increased and the pipe cutter becomes large and expensive.In addition to the operation of fixing the pipe to the pipe cutter, the roller blade is initialized. There was a drawback that it required a complicated setting operation to return to the position.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pipe cutter which does not require a feeding operation of a roller blade or a support roller at every predetermined rotation when cutting a pipe. To do.

[0006]

[Means for Solving the Problems]

 In order to achieve such an object, the gist of the present invention is that a main body having a concave portion for receiving a pipe and a main body provided so as to come into contact with the outer peripheral surface of the pipe and receive it. It is equipped with a receiving roller and a roller blade provided on the main body at a position on the outer peripheral surface of the pipe opposite to the position where the pipe comes into contact with the receiving roller.When cutting, the pipe is sandwiched between the receiving roller and the roller blade. In a pipe cutter of the type in which the main body is rotated relative to the pipe while pressing it, the roller cutter is elastically deformed according to the clamping pressure of the receiving roller and the roller blade, so that the roller blade has a predetermined feeding range with respect to the pipe. The roller blade feeding means for continuously feeding the roller blade is provided.

[0007]

[Action]

 With this configuration, the roller blade feeding means for continuously feeding the roller blade over the predetermined feeding range of the roller blade with respect to the pipe is provided by elastically deforming according to the sandwiching pressure of the receiving roller and the roller blade. Therefore, once the pipe is clamped between the receiving roller and the roller blade, the roller blade does not have to be fed out every time the pipe cutter makes one rotation. The elastic return force of the blade feeding means continuously feeds the pipe over a predetermined relative cutting movement range.

[0008]

[Effects of the Invention] Therefore, it is not necessary to feed the roller blade or the receiving roller by the screwing device every time the pipe cutter is rotated once, and the pipe cutter can be continuously rotated relative to the pipe. The cutting work is simplified and the work efficiency is greatly improved. In addition, since the skill required to manually rotate the screwing device is not required, the amount of manual feed by the screwing device is too large, which causes defective products due to deformation of the pipe. Further reduction of cutting work efficiency is solved.

Further, in a pipe cutter of a type in which a main body provided with a roller blade and a receiving roller is driven to rotate around a pipe by a motor, a mechanism for feeding out a predetermined amount of the roller blade for each rotation is unnecessary. The pipe cutter becomes small and inexpensive, and the troublesome setting operation for returning the roller blade to the initial position prior to cutting the pipe becomes unnecessary.

[0010]

【Example】

 An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing a pipe cutter 10 used for cutting a pipe made of a soft metal such as copper or aluminum, and FIG. 2 is partially cut away to show a main part thereof. It is a front view.

In FIGS. 1 and 2, the main body 12 is made of a light alloy such as an aluminum alloy, and has a curved portion 17 having an arcuate concave portion 16 for receiving the pipe 14, and a linear portion from one end thereof. It is composed of an elongated portion 18 extending. At the other end of the curved portion 17, a pair of cylindrical receiving rollers 20 and 22 for contacting the outer peripheral surface of the pipe 14 and receiving the cutting force applied to the pipe 14 are provided by the support pins 24 and 26. Therefore, each is rotatably provided. A concave groove having a slightly smaller diameter is provided at an axially intermediate position on the outer peripheral surfaces of the cylindrical receiving rollers 20 and 22, and the rotation center of the pipe 14 is displaced due to burrs generated on the outer peripheral surface of the pipe 14. It is prevented.

A groove 30 for preventing interference with a roller blade 28, which will be described later, is formed at the end of the elongated portion 18 on the curved portion 17 side, and inside the elongated portion 18, A rectangular hole 32 having a rectangular cross-sectional shape and a circular hole 34 having a circular cross-sectional shape are formed in order from the groove 30 side so as to extend vertically through the longitudinal portion 18. A cap-shaped lid member 38 having a central hole 36 is screwed to the tip of the elongated portion 18, and is rotated by being supported by a screw shaft 40 that penetrates the central hole 36 of the lid member 38. A member 42 is provided so as to be relatively rotatable.

That is, the rotation operating member 42 is made of a light alloy similar to the main body 12 and has a cylindrical shape in which an axial middle portion is closed by a partition wall 44, and a pair of parallel lines is formed. A mounting hole 46 having an elongated hole-shaped cross section formed of an arc connecting the ends is formed in the partition wall 44. On the other hand, the screw shaft 40 has a left-handed male threaded portion 50, a large diameter portion 52 having a maximum diameter, and a smaller diameter than the large diameter portion 52, which is passed through the central hole 36 of the lid member 38. The small-diameter portion 54 and the mounting portion 56, which has the same sectional shape as the mounting hole 46 and is fitted into the mounting hole 46, are sequentially formed. A screw 58 is screwed into the mounting portion 56 from one side of the partition wall 44 in the axial direction, whereby the screw shaft 40 and the lid member 38 are fixed so as not to rotate relative to each other, and the rotation operation is performed. The member 42 is attached so as to be relatively rotatable.

A prismatic moving member 60 is slidably fitted in the rectangular hole 32 formed in the elongated portion 18. A large-diameter circular hole 62, a small-diameter circular hole 64 having a smaller diameter than that, and a female screw hole 66 are sequentially formed in the moving member 60, and the male portion 50 of the screw shaft 40 is screwed into the female screw hole 66. Has been done. Therefore, when the rotation operating member 42 is rotated in the direction of arrow R in FIG. 1 and the screw shaft 40 is also rotated in the same direction, the moving member 60 is guided by the square hole 32 and is received by the receiving rollers 20, 22. Can be moved toward.

A pair of guide holes 68 are formed in the side wall of the distal end portion of the moving member 60, the guide holes 68 penetrating in a direction perpendicular to the axis of the moving member 60 and extending in a direction parallel to the axial direction. On the other hand, one end of a roller blade support member 72 that rotatably supports the roller blade 28 with a pin 70 is slidably fitted in the large diameter circular hole 62 of the moving member 60. The pin 70 is prevented from coming off by fitting an E-ring 76 at the tip end opposite to the head 74, and the roller blade 28 is axially positioned by a pair of cylindrical protrusions 77. . In the pin hole 78 formed at one end of the roller blade supporting member 72, one guide pin 80 engaging with the guide hole 68 is fixed by press fitting. A preloaded coil spring 82 is inserted between one end of the roller blade support member 72 and the stepped portion between the large diameter circular hole 62 and the small diameter circular hole 64 in the moving member 60. As a result, the roller blade supporting member 72 is prevented from rotating relative to the moving member 60 and the main body 12 about the axis by the guide pin 80 being guided by the guide hole 68, and the roller blade supporting member 72 is axially moved within a predetermined range. The movement is allowed and the coil spring 82 constantly urges the receiving rollers 20 and 22 in a direction approaching them. The coil spring 82 has an inner diameter larger than the diameter of the male screw portion 50 of the screw shaft 40.

Here, the length of the guide hole 68 is determined so that the axial movement range of the roller blade support member 72 is larger than the wall thickness of the pipe to be cut. The roller blade supporting member 72 can be pushed into the moving member 60 from its free position by the elastic compression of the coil spring 82. However, the moving distance L to the position where the roller blade supporting member 72 is pushed most is It corresponds to the relative cutting movement range of the roller blade 28 with respect to the pipe 14.

The roller blade 28 is made of a hard material such as hardened alloy tool steel (JIS G 4401 SKS3). Further, the lid member 38, the screw shaft 40, the moving member 60, and the like are also made of quenched steel material, so that durability is enhanced.

Next, the function and effect of the pipe cutter 10 configured as described above will be described. When cutting the pipe 14, first, the pipe 14 is put into the recess 16 of the main body 12 and positioned so that the outer peripheral surface of the pipe 14 comes into contact with the pair of receiving rollers 20 and 22. At this time, the roller blade 28 is separated from the receiving rollers 20 and 22 by a distance that allows the pipe 14 to pass therethrough. Next, the rotation operation member 42 is rotated in the R direction in FIG. 1 until the roller blade 28 contacts the pipe 14, and the pipe 14 is brought into three-point contact with the receiving rollers 20, 22 and the roller blade 28. 1 and 2 show this state.

Next, the rotation operating member 42 is further rotated in the R direction in FIG. 1, whereby the roller blade supporting member 72 is set to the most pushed position in the moving member 60. That is, the rotation operating member 42 is operated until the dimension L shown in FIG. 1 becomes zero. In this state, the roller blade 28 is pressed against the pipe 14 by the pressing force having a magnitude corresponding to the elastic force of the coil spring 82, and the pipe 14 is pinched between the roller blade 28 and the receiving rollers 20, 22. 3 and 4 show this state. The spring constant of the coil spring 82 is appropriately selected according to the property of the pipe 14 to be cut, that is, the material or the thickness of the pipe 14, and the contact pressure of the roller blade 28 is within a range in which the pipe 14 is not deformed. Predetermined to be as large as possible.

Then, until the cutting of the pipe 14 is completed, the main body 12 is continuously rotated about the pipe 14 in the X direction of FIG. 4 or the opposite direction. In this process, regardless of whether the roller blade 28 bites into the pipe 14, the roller blade 28 is continuously pressed against the pipe 14 by the elastic restoring force of the pre-compressed coil spring 82. Is continuously sent toward the pipe 14, the roller blade 28 is cut into the pipe 14 until the cutting of the pipe 14 is completed without the need to operate the rotary operation member 42.

As described above, according to the pipe cutter 10 of the present embodiment, due to the elastic deformation according to the sandwiching pressure between the receiving rollers 20, 22 and the roller blade 28, the roller blade 28 has a predetermined feeding range with respect to the pipe 14, That is, since the coil spring 82 that continuously sends the roller blade 28 to the pipe 14 over the relative cutting movement range L is provided, the coil spring 82 is temporarily provided between the receiving rollers 20, 22 and the roller blade 28 of the pipe 14. It is only necessary to clamp and rotate the body 12 until the pipe 14 is cut.

Therefore, unlike the prior art, the operation of sending out the roller blade or the receiving roller every time the pipe cutter is rotated once is not necessary, and the pipe cutter 10 can be continuously rotated, so that the pipe cutting operation can be performed. It will be easier and the work efficiency will be greatly improved. In addition, the skill required to manually rotate the screwing device is no longer required as in the past, so the amount of manual feed by the screwing device is too large, which causes defective products due to deformation of the pipe, and conversely, it is too small. The cutter further reduces the cutting work efficiency.

Further, according to this embodiment, since the groove 30 is provided and the coil spring 82 has an inner diameter larger than the diameter of the male screw portion 50 of the screw shaft 40, the roller blade 28 is retracted. Even if it is done, there is no interference between the roller blade 28 and the main body 12 or interference between the coil spring 82 and the screw shaft 40, and it is possible to press the large-diameter pipe 14 between the roller blade 28 and the receiving rollers 20, 22. There are advantages.

Although one embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be applied to other modes.

For example, in the above-described embodiment, the roller blade 28 is configured to be continuously fed in the direction approaching the receiving rollers 20 and 22 by being biased by the coil spring 82. The roller blades 28 may be sent out relative to the pipe 14 by providing the main body 12 with an urging means for urging the receiving rollers 20 and 22 toward the roller blades 28.

Further, in the above-described embodiment, the coil spring 82 is used as the roller blade feeding means, but instead of this, a rubber block, a laminated disc spring or the like is provided in place of the coil spring 82. May be. Since a disc spring generally has a larger spring constant than a coil spring, a pipe cutter for cutting a relatively hard pipe such as an iron pipe can be suitably constructed.

Further, in the above-described embodiment, the roller blade feeding means is applied to the manually-operated pipe cutter that rotates the main body 12 along the outer peripheral surface of the pipe 14 when cutting the pipe. The roller blade feeding means similar to that described above can also be applied to an electric rotary pipe cutter that relatively rotates the receiving rollers 20, 22 and the roller blade 28 relative to the pipe 14. For example, in an electric pipe cutting machine described in Japanese Examined Patent Publication No. 63-33963, the first lever 24 rotatably provided on the tool case 3 and rotatably supporting the cutter 23, or the tool case. The block 15 which is slidably fitted to 3 and which rotatably supports the support roller 12 is provided with a coil spring or the like for allowing the cutter 23 to be continuously fed out over a predetermined cutting range with respect to the pipe P. it can. This eliminates the need for a mechanism that feeds the cutter 23 by a predetermined amount for each rotation, which makes the electric pipe cutting machine small and inexpensive, and allows the cutter 23 to be moved to the initial position prior to cutting the pipe. There is no need for a troublesome setting operation for returning to. In this embodiment, the tool case 3 corresponds to the main body, the cutter 23 corresponds to the roller blade, and the support roller 14 corresponds to the receiving roller.

Further, in the above-described embodiment, the coil spring 82 is configured to be compressed more than the wall thickness dimension of the pipe 14, but even if the compression amount of the coil spring 82 is less than the wall thickness dimension. However, it is possible to obtain a temporary effect that it is not necessary to screw in each rotation.

Although not illustrated one by one, the present invention can be variously modified without departing from the spirit thereof.

[Brief description of drawings]

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

FIG. 2 is a front view with a part cut away to show a main part of the pipe cutter of FIG.

FIG. 3 is a diagram for explaining an operating position of the pipe cutter of FIG. 1, showing a state in which a coil spring is elastically deformed by being pressed by a receiving roller and a roller blade prior to cutting the pipe. Shows.

FIG. 4 is a partially cutaway front view showing the operating position of FIG.

[Explanation of symbols]

 10 Pipe Cutter 12 Main Body 14 Pipe 16 Recesses 20, 22 Receiving Roller 28 Roller Blade 82 Coil Spring (Roller Blade Sending Means)

Claims (1)

[Scope of utility model registration request] 1. A main body having a recess for receiving a pipe, a receiving roller provided on the main body so as to contact the outer peripheral surface of the pipe to receive the pipe, and the receiving roller on the outer peripheral surface of the pipe. A roller blade provided on the main body at a position opposite to a position where the main body contacts the pipe while pinching the pipe between the receiving roller and the roller blade during cutting. In a pipe cutter of a type that can be rotated relative to one another, by being elastically deformed in accordance with a pinching pressure by the receiving roller and the roller blade, the roller blade is continuously fed out over a predetermined feeding range of the roller blade with respect to the pipe. A pipe cutter characterized in that means is provided.