JP3069198U - Vertical pipe cutting device - Google Patents

Abstract

(57) [Problem] To provide a cutting device for a vertically split pipe which can fix the vertically split pipe in a holder and reliably perform cutting. SOLUTION: A holder 1 comprising an openable and closable cylindrical body 5 having a cutout 6 extending in a circumferential direction at a center portion, and a holding member 8 for fixing both end edges of a vertically split pipe held in the cylindrical body 5. And an openable and closable cutting tool 2 for rotatably holding the holder 1 such that the cutting blade 14a faces the notch 6 of the cylindrical body 5.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a vertical split pipe that is used to cut an old gas pipe buried underground in the vertical direction and cut a vertical split pipe with a C-shaped cross-section vertically in the axial direction as it is buried. The present invention relates to a cutting device.

[0002]

[Prior art]

 As a cutting tool for a gas pipe or the like, a pair of front and rear rollers 30, 30 for holding one half of the gas pipe as shown in FIG. The frame 32 provided with a cutting blade 31 which can be retracted is usually used. When cutting the gas pipe, the gas pipe is received by the roller 30, the frame 32 is rotated while pressing the cutting blade 31 from the outer periphery of the gas pipe, and the cutting blade 31 is advanced and gradually cut deeper. This is for cutting. However, as shown in FIG. 7, when cutting a vertical split pipe P having an opening formed so that its cross-sectional shape perpendicular to the axial direction forms a C-shape, a roller receiving a reaction force of the cutting blade 31 is used. Since the cutting blade 30 cannot be received on the peripheral surface of the vertically divided pipe P, the cutting blade 31 cannot be pressed against the vertically divided pipe P, and there is a problem that cutting cannot be performed. In order to solve the above-mentioned problems, the present applicant has filed an application for a cutting tool for a vertically split pipe disclosed in Japanese Patent Application Laid-Open No. 10-230409. However, in the cutting tool of this application, since the positioning is performed only by contacting the both end edges of the vertically split tube with the positioning projections, it is necessary to fix the vertically split tube or to closely contact the inner surface of the split type guide. Since it cannot be set loosely in the guide, pressing the cutting blade will cause the vertical split pipe to bend inward and not cut smoothly, and the cutting edges will be used to position both ends of the vertical split pipe during positioning. It could come off the projection. When the both ends of the vertical split pipe are separated from the positioning projections, the vertical split pipe rotates together with the cutting tool, so that there is a problem that cutting cannot be performed.

[0003]

[Problems to be solved by the invention]

 An object of the present invention is to provide a cutting device for a vertically split pipe which can fix the vertically split pipe in a holder and reliably perform cutting.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention comprises a tubular member having a central portion formed with a notch extending in the circumferential direction and capable of being opened and closed, and a presser for fixing both end edges of a vertically split tube held in the tubular member. A cutting device for a vertically split pipe, comprising a holder having a cutting shape and a cutting tool which can be opened and closed so as to rotatably hold the holder so that a cutting blade faces a notch of the cylindrical body. In the device of the first aspect, a vertically split pipe cutting device in which the holder is a hinge clamp type that is opened and closed by a hinge pin is the device of the second aspect, and in the device of the first or second aspect, the holding member comprises a screw tightening mechanism. A device for cutting a vertically split pipe is defined in claim 3, wherein the screw tightening mechanism of the holding member is provided with a hook for fixing the vertically split pipe in the cylinder at the tip and attached to the holder. Tighten the rod and screw rod A device for cutting a vertically split pipe consisting of a screw is defined as claim 4. In the invention of claims 1 to 4, a device for cutting a vertically split pipe attached to a holder through a detent mechanism is provided. According to a fifth aspect of the present invention, in the invention of the fifth aspect, the detent mechanism of the holding member is engaged with a detent contact surface formed on a screw rod of the screw tightening mechanism and a contact surface of the screw rod. The present invention is directed to a device for cutting a vertically split pipe, which comprises a stopper surface formed on a guide portion of a holder to be rotated.

[0005]

[Embodiment of the invention]

 Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. The present invention relates to a hinge clamp type holder 1 for holding a vertically split pipe P shown in FIGS. 3 and 4, and a hinge clamp type cutting tool for holding the holder 1 shown in FIGS. 2. Next, the holder 1 will be described with reference to FIGS. 3 and 4. The holder 1 is provided with a cylindrical body 5 which can be opened and closed by pivotally connecting two half cylinders bisected in the axial direction by hinge pins 3 of a boss portion. A holding member 8 for fixing both end edges of the vertically split pipe P (not shown) and a stopper 4 for connecting and fixing the open / close end of the cylindrical body 5. A cutout 6 extending in the circumferential direction is formed at the center of the cylindrical body 5 to allow the cutting blade 13a of the cutting tool 2 to intervene. Then, the cutting blade 14a of the cutting tool 2 is cut into the vertically split pipe P held in the cylindrical body 5 through the notch 6 to perform cutting.

The stopper 4 pivotally connects the head side of the bolt 4 a to a forked projection 5 a for clamping formed on the free end side of the cylindrical body 5, and the other of the two forked projections 5 b for clamping. The crotch is an intervening portion 5c of the bolt 4a. The forked protrusions 5a and 5b are brought into contact with each other, and the bolt 4a is erected and pivoted to intervene in the interposed portion 5c of the forked protrusion 5b. To lock the cylindrical body 5 by tightening the bifurcated protrusion 5b, and set the holder 1 on the vertically split pipe P. Further, guide grooves 7, 7 for guiding a pair of front and rear rollers 13, 13 of the rotating cutting tool 2 are formed on both sides of the cylindrical body 5 with the notch 6 therebetween.

Reference numeral 8 denotes a holding member for the vertically split tube P that performs a holding operation by a screw tightening mechanism 8a. The holding member 8 is attached to the holder 1 via a rotation preventing mechanism 8b and has an opening of the vertically split tube P. Are fixed at four places. By fixing the vertically split pipe P with the holding member 8, the vertically split pipe P is held and fixed in the cylindrical body 5 of the holder 1 and added at the time of cutting. The vertical split pipe P is prevented from bending due to the cutting pressure. The screw tightening mechanism 8a of the holding member 8 includes a guide portion 9 formed on the left and right edges of the holder 1 and a tightening screw 11 for tightening a screw rod 10 provided with a hook 10a at its tip. The screw rod 10 slides along the guide portion 9 by the tightening, and moves the hook 10a for fixing the vertically split pipe P toward the inner surface of the cylindrical body 5. Further, the detent mechanism 8b includes a detent surface 10b formed on the screw rod 10 of the screw tightening mechanism 8a and a detent surface 9a formed on the guide portion 9 of the holder 1. The contact surface 10b of the screw rod 10 is made flat, and the contact surface 9a of the guide portion 9 is also made flat, and the screw rod 10 is stopped from rotating by engaging the both contact surfaces 10b and 9a, and the hook 10a is turned off. Both ends of the vertically split pipe P can be reliably locked by preventing it from being turned sideways or downward so that it always opens upward.

As shown in FIGS. 5 and 6, the hinge clamp type cutting tool 2 is composed of a pair of semi-circular main bodies 12 that can be opened and closed around hinge pins 12a. Can be sandwiched and held. A pair of front and rear rollers 13, 13 for receiving a vertically split pipe P (not shown) are supported on the clamp portion side of the main body 12. The rollers 13 are guided by the guide grooves 7 of the holder 1 to smooth the rotation of the cutting tool 2. Reference numeral 14 denotes a cutting mechanism for the cutting tool 2. The cutting mechanism 14 includes a pair of upper and lower cutting blades 14 a disposed on the opposite surface side of the roller 13, and a cutting blade mount 14 b supporting the cutting blade 14 a. And a push screw 15 for moving the cutting blade mounting base 14b forward and backward. The push screw 15 is screwed into a hinge pin 12a of the main body 12, and a cutting blade mounting base 14b is rotatably attached to a distal end, and a hexagonal portion 15a for locking a tool T such as a ratchet wrench is provided at a base end. By turning a push screw 15 clockwise or counterclockwise by locking a tool such as a ratchet wrench (not shown) in the hexagonal portion 15a, the cutting not guided by the guide notch of the main body 12 is formed. The blade mount 14b is moved forward and backward. The cutting blade 14a performs a cutting operation to the vertically split pipe P or a retreat operation after cutting by the forward and backward movement of the cutting blade mounting base 14b.

The semi-circular main body 12 is provided with a stopper 17 for locking the floating end. The stopper 17 allows a screw shaft portion of a bolt 18 to be screwed into a pivot of a forked projection 17 a for clamping formed at a free end of the semicircular main body 12, and connects the forked portion of the other forked projection 17 b to the bolt 18. After the forked protrusions 17a and 17b are abutted, the bolt 18 is raised and pivoted to intervene in the forked portion 17c of the forked protrusion 17b, and then the bolt 18 is tightened and rotated. Thereby, the forked projection 17b is tightened by the seat surface of the bolt head, the main body 12 is connected and fixed, and the cutting tool 2 is set on the holder 1. Reference numeral 20 denotes locking holes for the rotation operation rod 19 formed at four places on the outer peripheral surface of the main body 12.

In order to cut the vertically split pipe P with the above-mentioned structure, first, the lock of the stopper 4 for connecting and fixing the cylindrical body 5 is released, and the cylindrical body of the hinge clamp type holder 1 is removed. 5 is opened centering on the hinge pin 3. Then, each half cylinder of the cylindrical body 5 opened from the outside of the vertically split pipe P is covered. At this time, both end edges of the opening having the C-shaped cross section of the vertical split pipe P are located at the positions of the hooks 10 a of the holding member 8. Next, the bolt 4a pivotally attached to the clamping forked protrusion 5a of the stopper 4 is erected and pivoted so as to be positioned within the intervention portion 5c of the other forked protrusion 5b superimposed on the forked protrusion 5a. Further, the tightening nut 4b is screwed into the bolt 4a protruding from the forked protrusion 5b and tightened. By tightening the tightening nut 4b, the forked protrusions 5a and 5b are fixed and the cylindrical body 5 is connected and fixed.

Next, when the tightening screw 11 of the presser 8 that performs the pressing operation by the screw tightening mechanism 8a is tightened with a tool such as a wrench or a ratchet wrench, a contact surface 9a for preventing the holder 1 from rotating is formed. The screw rod 10 of the screw tightening mechanism 8a, which is fitted into the guide portion 9 and has the rotation-preventing contact surface 10b engaged with the contact surface 9a, is prevented from rotating by the contact surface 9a, and the guide portion 9 is fixed. It slides and projects out of the cylindrical body 5. Both end edges of the vertical split pipe P held in the cylinder 5 by the extension movement of the screw rod 10 are pressed against the inner surface of the cylinder 5 by the hooks 10a of the four holding members 8, as shown in FIG. The vertically split pipe P is held and fixed in the cylindrical body 5 as described above. Thus, when the vertically split pipe P is set in the holder 1, the cut position of the vertically split pipe P is exposed by the notch 6 of the cylindrical body 5.

Next, the lock of the stopper 17 for connecting and fixing the main body 12 of the cutting tool 2 is released, and the main body 12 of the hinge clamp type cutting tool 2 is opened around the hinge pin 13a. Then, the main body 12 having a semicircular arc shape is placed on the holder 1 such that the cutting blade 14a of the cutting mechanism 14 is positioned in the notch 6 of the holder 1. At this time, the pair of rollers 13, 13 before and after the cutting tool 2 are received in the guide grooves 7, 7 of the holder 1. Next, the bolt 18 pivotally attached to the bifurcated projection 17a of the stopper 17 is raised and pivoted to position the bolt 18 in the intervention portion 17c of the bifurcated projection 17b. When rotated, the bolt 18 screwed into the pivot of the forked projection 17a is tightened, the forked projection 17b is pressed against the forked projection 17a by its head seat surface, and the main body 12 of the cutting tool 2 is connected and fixed. Will be done. When the main body 12 is connected and fixed, the cutting tool 2 is rotatably set on the holder 1 as shown in FIGS.

Subsequently, if a tool T such as a ratchet wrench is engaged with the hexagonal portion 15a of the push screw 15 of the cutting mechanism 14 and the push screw 15 is rotated forward, the cutting blade mounting base 14b of the cutting mechanism 14 becomes The cutting blade 14a is pressed forward through the notch 6 against the surface of the vertical pipe P set in the holder 1 while moving forward. The pressing force of the cutting blade 14a is applied to the vertically split pipe P, and both end edges of the opening of the vertically split pipe P are pressed against the inner surface of the cylindrical body 5 by the hooks 10a of the holding members 8 to be vertically split. Since the pipe P is held and fixed in the tubular body 5, the vertically split pipe P does not bend due to the pressing force due to the cutting. Then, with the cutting blade 14a pressed against the cutting tool 2, the turning operation rod 19 is inserted into the locking hole 20 of the cutting tool 2, and the turning operation rod 19 is repeatedly pivoted to reciprocate the cutting tool 2. In this case, a cut is formed in the circumferential body surface between both end edges of the vertically split pipe P.

In this manner, when a cut of a certain depth is obtained in the circumferential body surface of the vertically split pipe P, the tool fixed to the hexagonal portion 15a is again operated to turn the set screw 15 in the forward direction. To move the cutting blade mount 14b of the cutting mechanism 14 forward. The cutting blade 14a is deeply cut into the circumferential body surface of the vertically split pipe P by the forward movement of the cutting blade mount 14b. In this state, if the cutting tool 2 is reciprocated through the turning operation rod 19 in the same manner as described above, a deeper cut can be obtained in the circumferential body surface of the vertically split pipe P. By repeating such an operation, the vertically split pipe P is eventually cut. After the cutting of the vertically split pipe P, the body 12 of the cutting tool 2 is opened and removed from the holder 1 with the hinge pin 12a as the center by performing the reverse operation to the above, and the tightening screw 11 of the holding tool 8 is removed. To release the vertical pipe P from the hook 10a. Next, the fastening nut 4b of the stopper 4 of the holder 1 is loosened to release the fastening with the forked projections 5b and 5c for clamping, and the cylinder 5 is opened centering on the hinge pin 3 and the holder 1 is vertically moved. It only has to be removed from the split pipe P.

In the preferred embodiment, the holder 1 is a hinge clamp type. However, it is also possible to lock the split cylinder 5 with two fasteners 4. In addition, although the presser 8 is operated by the screw tightening mechanism 8a, it is a matter of course that the vertically split pipe P may be held and fixed by using a cam mechanism or a link mechanism. Further, the holding member 8 is prevented from rotating by the rotation preventing mechanism 8b so that the work of fixing the vertically split pipe P can be easily performed to improve the workability, but the rotation preventing mechanism 8b is used. Needless to say, it is not necessary.

[0016]

[Effect of the invention]

 As is apparent from the above description, the present invention provides the holder with fixing members for fixing both ends of the vertically split tube, so that the vertically split tube can be held and fixed in the cylinder of the holder. The vertically split pipe is fixedly adhered to the inner surface of the cylinder, and the vertically split pipe does not bend due to the pressing force at the time of cutting, so that the cutting is performed smoothly and reliably. In addition, since the both ends of the vertically split pipe are securely fixed by the presser, the press of the vertically split pipe is released by the turning operation during cutting work and the pressing force at the time of cutting, and the vertically split pipe rotates together with the cutting tool It will not be impossible to cut it. By setting the holder to be a hinge clamp type, the vertical split tube can be set easily and quickly, and the workability can be improved. The holding tool is operated by a screw tightening mechanism, and the screw tightening mechanism is composed of a screw rod provided with a hook at a tip and a tightening screw for tightening the screw rod. As a result, a simple structure without any failure can be achieved, and the cost can be reduced. By providing a detent mechanism on the holding tool as in claim 5, it is not necessary to stop the holding tool by hand when holding and fixing the vertically split pipe, and the fixing work can be performed quickly. It can be carried out. According to the sixth aspect of the present invention, the anti-rotation mechanism is formed by a screw rod having an abutment surface for anti-rotation and a guide portion of a holder having an abutment surface for anti-rotation. It has various advantages such as being able to perform a rotation stop with less trouble. Therefore, the present invention has a very high practical value as a device for cutting a vertically split pipe which has solved the conventional problems.

[Brief description of the drawings]

FIG. 1 is a front view showing a preferred embodiment of the present invention.

FIG. 2 is a side view showing a preferred embodiment of the present invention.

FIG. 3 is a side view of the holder used in the preferred embodiment of the present invention.

FIG. 4 is a front view of the holder used in the preferred embodiment of the present invention.

FIG. 5 is a front view of the cutting tool used in the preferred embodiment of the present invention.

FIG. 6 is a side view of the cutting tool used in the preferred embodiment of the present invention.

FIG. 7 is a perspective view showing a conventional cutting tool.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Holder 2 Cutting tool 3 Hinge pin 5 Cylindrical body 6 Notch 8 Holder 8a Screw tightening mechanism 8b Rotation stop mechanism 9 Guide part 9a Abutment surface 10 Screw rod 10a Hook 10b Abutment surface 11 Tightening screw 14a Cutting blade

Continuing on the front page (72) Hiroyuki Shiro, 1-2-1, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture Inside Osaka Gas Co., Ltd. (72) Masatoshi Okamoto 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka No. Osaka Gas Co., Ltd.

Claims (6)

[Utility model registration claims] 1. A holder comprising: an openable and closable cylinder having a cutout extending in a circumferential direction at a central portion; and a holding member for fixing both end edges of a vertical split pipe held in the cylinder, and the cylinder. And an openable and closable cutting tool for rotatably holding the holder so that the cutting blade faces the notch. 2. The vertical split tube cutting device according to claim 1, wherein the holder is a hinge clamp type that is opened and closed by a hinge pin. 3. The holding device according to claim 1, wherein said holding member comprises a screw fastening mechanism.
Or the device for cutting a vertically split pipe according to item 2. 4. A screw tightening mechanism for a holding tool, comprising: a screw rod provided at a tip thereof with a hook for fixing a vertically split pipe in a cylindrical body and attached to a holder; and a tightening screw for tightening the screw rod. The vertical split pipe cutting device as described in the above. 5. The vertical split pipe cutting device according to claim 1, wherein the holding member is attached to the holder via a rotation preventing mechanism. 6. A rotation preventing mechanism for a holding tool, wherein a rotation preventing contact surface formed on a screw rod of a screw tightening mechanism and a rotation preventing guide formed on a guide portion of a holder engaged with the screw rod contact surface. The cutting device for a vertically split pipe according to claim 5, comprising a contact surface for stopping.