Rolling cutter

Abstract

To provide a rolling cutter equipped with a cleaning movable body that can solve the problem that when hard protrusions such as tree roots project inside a pipeline, the tree roots projecting inside the pipeline cannot be removed successfully, because an external surface of a conventional cleaning movable body is brought into contact with the inner wall of the pipeline by injecting a fluid into a rubber bag body.SOLUTION: The rolling cutter of the present invention comprises an egg-shaped blade body 16 formed by intersecting leftward cutting blades 9 and rightward cutting blades 10, thereby enabling gripping and removal of even tree roots protruding inside the pipeline with "diagonally latticed leftward cutting blades 9 and rightward cutting blades 10" by simply pulling the egg-shaped blade body 16 without rotating the same. Additionally, the sectional diameter of the egg-shaped blade body 16 can be modified and maintained by changing the length between a left adjustment plate 33 and a right adjustment plate 34, thus allowing easy modification and maintenance of the sectional diameter of the egg-shaped blade body 16 without generating a large load during operation.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a rolling cutter that moves within a pipeline to remove protrusions protruding into the pipeline. [Background technology]

[0002] Conventionally, a cleaning movable body is known that moves in a pipeline to remove deposits attached to the pipeline. In this type of cleaning movable body 154, a water-impregnated sponge is packed in a rubber bag 162, and a mesh-like cleaning rib 166 is integrally formed on the surface of the bag 162. A fluid can be injected into the bag 162 and the fluid can be extracted through the tube 138 by the suction and discharge pump 141a of the pressure adjustment means 141, so that the outer surface of the cleaning movable body 154 can be brought into contact with the entire circumference of the inner wall of the pipeline 112 with a substantially constant pressure (see FIG. 10). A string-like body 139 is connected to the front and rear of the cleaning movable body 154 in the moving direction in order to pull the cleaning movable body 154 from the front and rear in the moving direction. Then, by pulling the cleaning movable body 154 via the string-like body 139, the cleaning movable body 154 can be moved inside the pipe 112 while sliding or rubbing with the outer surface of the cleaning movable body 154 in contact with the entire circumference of the inner wall of the pipe 112 with a substantially constant pressure (see FIG. 11). In this way, by the cleaning movable body 154 moving inside the pipe 112, dust 142 inside the pipe 112 is pushed out, and deposits 143 adhering to the pipe wall are also scraped off (see Patent Document 1). Here, FIG. 10 is a schematic explanatory diagram of a pressure adjustment means for controlling the pressure of the fluid in the bag of a pipe cleaning system using a conventional cleaning movable body, and FIG. 11 is a schematic explanatory diagram of a pipe cleaning system using the same cleaning movable body.

[0003] [Patent Document 1] JP 2015-13280 A DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0004] However, in the conventional cleaning movable body 154, a fluid is injected by the suction and discharge pump 141a into a rubber bag 162 filled with a sponge soaked in water, and the cleaning movable body 154 is moved while sliding or rubbing in the pipeline 112 with the outer surface of the cleaning movable body 154 in contact with the inner wall of the pipeline 112, thereby pushing out dust 142 in the pipeline 112 and removing deposits 143 adhering to the pipeline wall. Therefore, in order to bring the outer surface of the cleaning movable body 154 into contact with the entire circumference of the inner wall of the pipeline 112 with a substantially constant pressure, equipment such as the suction and discharge pump 141a and the pipe 138 for injecting the fluid into the rubber bag 162 is required, which causes problems in that the equipment costs are high and many man-hours are required to inject the fluid into the rubber bag 162. In addition, since the fluid is injected into the rubber bag 162 and the outer surface of the cleaning body 154 is brought into contact with the inner wall of the pipeline 112, if there are hard protrusions such as tree roots protruding into the pipeline, the cleaning ribs 166 on the surface of the rubber bag 162 into which the fluid has been injected move inward due to their elasticity, and there is a problem in that the hard protrusions such as tree roots protruding into the pipeline cannot be successfully removed.

[0005] The present invention has been made in consideration of the above problems, and has an object to provide a rolling cutter that can be easily brought into contact with the inner wall of a pipeline without causing a large load, and that can easily remove hard protrusions such as tree roots even if they are protruding into the pipeline. [Means for solving the problem]

[0006] In order to solve the above problems and achieve the above objects, a first aspect of the present invention is a rolling cutter that removes protruding objects protruding into a pipeline by moving inside the pipeline, the rolling cutter comprising: a rod-shaped shaft member; a left side adjustment plate having a left side through hole through which the shaft member is inserted and attached to the left side of the shaft member with the shaft member inserted into the left side through hole; a right side adjustment plate having a right side through hole through which the shaft member is inserted and attached to the right side of the shaft member with the shaft member inserted into the right side through hole; a left side rope connector attached to the left end of the shaft member and to which a rope is attached; a right side rope connector attached to the right end of the shaft member and to which a rope is attached; The cutting blade has a plurality of left-facing cutting blades spaced apart around the circumference of the shaft member while rotating diagonally leftward with respect to the longitudinal direction of the shaft member, a plurality of right-facing cutting blades made of metal and spaced apart around the circumference of the shaft member between the left and right adjustment plates while rotating diagonally rightward with respect to the longitudinal direction of the shaft member, and an adjustment plate length changing and maintaining means for changing and maintaining the length between the left and right adjustment plates, wherein the left-facing cutting blades and the right-facing cutting blades are arranged in a crossed diagonal grid pattern to form an egg-shaped cutting blade body having an overall outer shape that is approximately egg-shaped, and the adjustment plate length changing and maintaining means can change the length between the left and right adjustment plates to change and maintain the cross-sectional diameter of the egg-shaped cutting blade body.

[0007] According to the present invention, between the left and right adjustment plates, a plurality of left-facing cutting blades (right-facing cutting blades) are provided around the shaft member at intervals while rotating diagonally left (diagonally right) with respect to the longitudinal direction of the shaft member, and the left-facing cutting blades and right-facing cutting blades are arranged in a crossed diagonal lattice pattern to form an egg-shaped cutting blade body whose overall external shape is approximately egg-shaped. Therefore, even if a hard protrusion such as a tree root protrudes into the pipeline, by simply pulling the egg-shaped cutting blade body without rotating it, the left-facing cutting blades and right-facing cutting blades arranged in a crossed diagonal lattice pattern can pinch and easily cut and remove even stubborn protrusions protruding into the pipeline with the "diagonal lattice-shaped left-facing and right-facing cutting blades." In addition, the cross-sectional diameter of the egg-shaped cutting blade body can be changed and maintained by changing the length between the left and right adjustment plates. Therefore, no other equipment is required for changing and maintaining the cross-sectional diameter of the egg-shaped cutting blade body, and the cross-sectional diameter of the egg-shaped cutting blade body can be easily changed and maintained by work that does not generate a large load.

[0008] A second aspect of the present invention is the rolling cutter according to the first aspect, wherein the shaft member has a left-handed thread on one end side and a right-handed thread on the other end side, the means for maintaining the change in the length between the adjusting plates is a left-handed thread nut screwed onto the left-handed thread of the shaft member and a right-handed thread nut screwed onto the right-handed thread of the shaft member, and the left side adjustment plate is fixed to the shaft by the left-handed thread nut screwed onto the left-handed thread of the shaft member being disposed on the end side of the shaft member, or the right-handed thread nut screwed onto the right-handed thread of the shaft member being disposed on the end side of the shaft member. The right side adjustment plate is attached to the shaft member by a right-hand threaded nut screwed onto the right-hand thread of the shaft member being arranged on the end side of the shaft member, or a left-hand threaded nut screwed onto the left-hand thread of the shaft member being arranged on the end side of the shaft member, and the means for changing and maintaining the length between the adjustment plates is characterized in that the length between the left side adjustment plate and the right side adjustment plate is changed and maintained by changing the position of the right-hand threaded nut screwed onto the right-hand thread of the shaft member and / or the position of the left-hand threaded nut screwed onto the left-hand thread of the shaft member.

[0009] According to the present invention, the left-side adjustment plate (right-side adjustment plate) is attached to the shaft member by disposing a left-side thread nut (right-side thread nut) screwed onto the left-side thread (right-side thread) of the shaft member on the end side of the shaft member, or by disposing a right-side thread nut (left-side thread nut) screwed onto the right-side thread (left-side thread) of the shaft member on the end side of the shaft member, so that the operator can change and maintain the length between the left-side adjustment plate and the right-side adjustment plate by rotating the entire rolling cutter in the same circumferential direction while holding the shaft member and changing the position of the right-side thread nut screwed onto the right-side thread of the shaft member and / or the position of the left-side thread nut screwed onto the left-side thread of the shaft member. This makes it possible to easily change and maintain the cross-sectional diameter of the egg-shaped cutting blade body without requiring any other equipment for changing and maintaining the cross-sectional diameter of the egg-shaped cutting blade body.

[0010] A third aspect of the present invention is a rolling cutter according to the first aspect, wherein the shaft member has a left-handed thread threaded on one end side and a right-handed thread threaded on the other end side, and the means for changing and maintaining the length between the adjustment plates is a left-handed thread adjustment plate nut screwed onto the left-handed thread of the shaft member integrally formed with the left adjustment plate or the right-handed adjustment plate, and a right-handed thread adjustment plate nut screwed onto the right-handed thread of the shaft member integrally formed with the right adjustment plate or the left-handed adjustment plate, and the length between the left-handed adjustment plate and the right-handed adjustment plate is changed and maintained by changing the position of the right-handed thread adjustment plate nut screwed onto the right-handed thread of the shaft member and / or the position of the left-handed thread adjustment plate nut screwed onto the left-handed thread of the shaft member.

[0011] According to the present invention, the means for changing and maintaining the length between the adjustment plates is a left-hand thread adjustment plate nut screwed onto the left-hand thread of the shaft member integrally provided on the left-hand or right-hand adjustment plate, and a right-hand thread adjustment plate nut screwed onto the right-hand thread of the shaft member integrally provided on the right-hand or left-hand adjustment plate, so that the operator can change the position of the right-hand thread adjustment plate nut screwed onto the right-hand thread of the shaft member and / or the position of the left-hand thread adjustment plate nut screwed onto the left-hand thread of the shaft member by rotating the entire rolling cutter in the same circumferential direction while holding the shaft member, thereby easily changing and maintaining the length between the left-hand and right-hand adjustment plates. This makes it possible to easily change and maintain the cross-sectional diameter of the egg-shaped cutting blade body without requiring any other equipment for changing and maintaining the cross-sectional diameter of the egg-shaped cutting blade body.

[0012] A fourth aspect of the present invention is the rolling cutter according to the first aspect, wherein the shaft member has a plurality of one-end side pin insertion holes formed at predetermined positions on one end side and a plurality of other-end side pin insertion holes formed at predetermined positions on the other end side, the adjustment plate distance change maintaining means is a one-end side pin inserted into the one-end side pin insertion hole of the shaft member and an other-end side pin inserted into the other-end side pin insertion hole of the shaft member, and the left adjustment plate is arranged such that the one-end side pin inserted into the one-end side pin insertion hole of the shaft member is disposed on the end side of the shaft member, or the other-end side pin inserted into the other-end side pin insertion hole of the shaft member is disposed on the end side of the shaft member. and the right side adjustment plate is attached to the shaft member by the other end side pin inserted into the other end side pin insertion hole of the shaft member being arranged on the end side of the shaft member, or the one end side pin inserted into the one end side pin insertion hole of the shaft member being arranged on the end side of the shaft member, and the means for changing and maintaining the length between the adjustment plates is characterized in that the length between the left side adjustment plate and the right side adjustment plate is changed and maintained by removing the one end side pin from the one end side pin insertion hole of the shaft member and inserting it into the other one end side pin insertion hole, and / or removing the other end side pin from the other end side pin insertion hole of the shaft member and inserting it into the other other end side pin insertion hole.

[0013] According to the present invention, the shaft member has a plurality of one-end side pin insertion holes (other-end side pin insertion holes) formed at predetermined positions on one end side (other end side), and the left side adjustment plate (right side adjustment plate) is attached to the shaft member by arranging the one-end side pin (other-end side pin) inserted into the one-end side pin insertion hole (other-end side pin insertion hole) of the shaft member on the end side of the shaft member, or by arranging the other-end side pin (one-end side pin) inserted into the other-end side pin insertion hole (one-end side pin insertion hole) of the shaft member on the end side of the shaft member.Therefore, an operator can change and maintain the length between the left side adjustment plate and the right side adjustment plate by removing the one-end side pin from the one-end side pin insertion hole of the shaft member and inserting it into the other one-end side pin insertion hole, and / or removing the other end side pin from the other end side pin insertion hole of the shaft member and inserting it into the other other end side pin insertion hole. This makes it possible to easily change and maintain the cross-sectional diameter of the egg-shaped cutting blade body to correspond to the one-end side pin insertion hole (other-end side pin insertion hole) of the shaft member into which the one-end side pin (other-end side pin) is inserted, without requiring any other equipment for changing and maintaining the cross-sectional diameter of the egg-shaped cutting blade body.

[0014] A fifth aspect of the present invention is a rolling cutter according to the first aspect, characterized in that the longitudinal cross sections of the left-facing cutting blade and the right-facing cutting blade are formed in an approximately inverted trapezoidal shape.

[0015] According to the present invention, the longitudinal cross sections of the left-facing and right-facing cutting blades are formed in an approximately inverted trapezoid shape, so that even if a protrusion such as a tree root with a thick stem protrudes into the pipeline, it can be easily cut and removed by the sharp edges of the left-facing and right-facing cutting blades, which have longitudinal cross sections that are approximately inverted trapezoidal. Effect of the Invention

[0016] According to the present invention, the inner wall of a pipeline can be easily contacted without causing a large load, and even if a hard protrusion such as a tree root is protruding into the pipeline, it can be easily removed. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1A is a right perspective view of the rolling cutter according to the first embodiment of the present invention, FIG. 1B is a front view of the rolling cutter, FIG. 1C is a right side view of the rolling cutter, and FIG. 1D is a view showing longitudinal cross sections of the left-hand cutting blade and the right-hand cutting blade of the rolling cutter. [Diagram 2] FIG. [Diagram 3] 11A to 11C are diagrams showing a procedure for changing and maintaining the length between the left and right adjustment plates of the rolling cutter. [Figure 4] FIG. 4 is a schematic diagram showing a construction situation using the rolling cutter. [Diagram 5] (a) A diagram showing the state before the tree roots protruding into the pipeline are cut off by the rolling cutter, (b) A diagram showing the state of the tree roots protruding into the pipeline being cut off by the rolling cutter, and (c) A diagram showing the state after the tree roots protruding into the pipeline have been cut off by the rolling cutter. [Figure 6] 1A is a right-side perspective view of a rolling cutter according to a second embodiment of the present invention, (b) a front view of the rolling cutter, (c) a side view of the rolling cutter, and (d) a view showing longitudinal cross sections of a left-facing cutting blade and a right-facing cutting blade of the rolling cutter. [Figure 7] 11A to 11C are diagrams showing a procedure for changing and maintaining the length between the left and right adjustment plates of the rolling cutter. [Figure 8] 11A is a right perspective view of a rolling cutter according to a third embodiment of the present invention, FIG. 11B is a front view of the rolling cutter, FIG. 11C is a side view of the rolling cutter, and FIG. 11D is a view showing longitudinal cross sections of a left-facing cutting blade and a right-facing cutting blade of the rolling cutter. [Figure 9] 11A to 11C are diagrams showing a procedure for changing and maintaining the length between the left and right adjustment plates of the rolling cutter. [Figure 10] FIG. 13 is a schematic explanatory diagram of a pressure adjusting means for controlling the pressure of the fluid in the bag of a conventional pipe cleaning system using a movable cleaning body. [Figure 11] FIG. 2 is a schematic explanatory diagram of a pipe cleaning system using the same mobile cleaning body. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] (First embodiment) A rolling cutter according to a first embodiment of the present invention will be described with reference to the drawings, in which Fig. 1(a) is a right perspective view of the rolling cutter according to the first embodiment of the present invention, Fig. 1(b) is a front view of the rolling cutter, Fig. 1(c) is a right side view of the rolling cutter, Fig. 1(d) is a view showing longitudinal cross sections of the left-facing cutting blade and the right-facing cutting blade of the rolling cutter, and Fig. 2 is an exploded perspective view of the rolling cutter.

[0019] The rolling cutter 1 has a shaft member 2, a left adjustment plate 3, a right adjustment plate 4, a left thread nut 5 (5a, 5b), a right thread nut 6 (6a, 6b), a left rope connector 7, a right rope connector 8, a left cutting blade 9, and a right cutting blade 10. As described below, the rolling cutter 1 is used to remove protruding objects such as tree roots 12 protruding into the pipeline 11 by moving it inside the pipeline 11 (see Figures 4 and 5). The left thread nut 5 and the right thread nut 6 constitute an adjustment plate length changing and maintaining means for changing and maintaining the length between the left adjustment plate 3 and the right adjustment plate 4 (see Figure 1). In this embodiment, the adjustment plate length change maintaining means is constituted by the left thread nut 5 and the right thread nut 6, but this is not limited to the above, and the adjustment plate length change maintaining means may be constituted by either the left thread nut 5a and / or the right thread nut 6a, and the adjustment plate length change maintaining means may be constituted by the left thread 13 on the left end side (one end side or the other end side) and the right thread 14 on the right end side (the other end side or the one end side) of the shaft member 2 described below. In other words, when the left side adjustment plate 3 (right side adjustment plate 4) is rotated along the left thread 13 (right thread 14) of the shaft member 2, and after the rotation of the left side adjustment plate 3 (right side adjustment plate 4) is completed, the adjustment plate length change maintaining means may be constituted by the left thread 13 and / or the right thread 14.

[0020] The shaft member 2 is made of stainless steel and is formed in a rod-like shape consisting of an axial bolt. Specifically, the shaft member 2 is formed in a rod-like shape with a left-hand thread 13 threaded on the left end side and a right-hand thread 14 threaded on the right end side. One pin insertion hole 2a is formed on each of the one end side and the other end side of the shaft member 2. In this embodiment, the left-hand thread 13 is threaded on the left end side of the shaft member 2 and the right-hand thread 14 is threaded on the right end side, but this is not limited to the above. The left-hand thread may be threaded on the right end side of the shaft member 2 and the right-hand thread may be threaded on the left end side. That is, the left-hand thread may be threaded on the one end side and the right-hand thread may be threaded on the other end side. The left-hand thread may be threaded on the left end side and the right end side of the shaft member 2, and the right-hand thread may be threaded on the left end side and the right end side of the shaft member 2. Also, the left-hand thread may be threaded to the right of the center of the shaft member 2 and the right-hand thread may be threaded to the left of the center, or the left-hand thread may be threaded to the left of the center of the shaft member 2 and the right-hand thread may be threaded to the right of the center. Also, the entire shaft member 2 may be threaded with a left-hand thread (right-hand thread). Here, the one end side and the other end side of the shaft member 2 do not mean that the left-hand thread 13 or the right-hand thread 14 is threaded only on the one end side and the other end side of the shaft member 2, but means that the left-hand thread 13 or the right-hand thread 14 is threaded at least on the one end side and the other end side of the shaft member 2. In other words, the one end side and the other end side of the shaft member 2 include the left-hand thread 13 or the right-hand thread 14 being threaded not only on the one end side and the other end side of the shaft member 2 but also on the central side. Furthermore, in this embodiment, one pin insertion hole 2a is formed on one end side and one on the other end side of the shaft member 2, but this is not limited to this, and three to five pin insertion holes 2a may be formed on one end side and / or the other end side of the shaft member 2.

[0021] The left side adjustment plate 3 is made of stainless steel, and has a left side through hole 17 formed on its side through which the shaft member 2 is inserted. The left side adjustment plate 3 is attached to the left side of the shaft member 2 with the shaft member 2 inserted through the left side through hole 17. The left side adjustment plate 3 is attached to the shaft member 2 by disposing a left side thread nut 5a (left side thread nut 5b) screwed onto the left side thread 13 of the shaft member 2 on the end side (center side) of the shaft member 2. That is, the left side adjustment plate 3 is attached to the shaft member 2 while a force moving the left side adjustment plate 3 toward the end side of the shaft member 2 acts due to the elastic force of the egg-shaped cutting blade body 16 described later, but the force moving the left side adjustment plate 3 toward the end side of the shaft member 2 is blocked by the left side thread nut 5a. In addition, the diameter of the left side through hole 17 of the left side adjustment plate 3 is approximately the same as the diameter of the thread root of the left side thread 13 of the shaft member 2, so that the left side adjustment plate 3 can be moved along the left side thread 13 of the shaft member 2 by rotating the left side adjustment plate 3. In this embodiment, the left-side adjustment plate 3 is attached to the shaft member 2 by arranging the left-side thread nut 5a (left-side thread nut 5b) screwed onto the left-side thread 13 of the shaft member 2 on the end side (center side) of the shaft member 2, but this is not limited thereto, and the left-side adjustment plate 3 may be attached to the shaft member 2 by arranging the right-side thread nut 6a (right-side thread nut 6b) screwed onto the right-side thread 14 of the shaft member 2 on the end side (center side) of the shaft member 2. Also, in this embodiment, the diameter of the left-side through-hole 17 of the left-side adjustment plate 3 is approximately the same as the diameter of the thread root of the left-side thread 13 of the shaft member 2, but this is not limited thereto, and the left-side adjustment plate 3 may be larger than the diameter of the thread of the left-side thread 13 of the shaft member 2. In this way, by making the diameter of the left-side through hole 17 of the left-side adjustment plate 3 larger than the diameter of the threads of the left-side screw thread 13 of the shaft member 2, the left-side adjustment plate 3 can move smoothly over the upper part of the threads of the left-side screw thread 13 without getting caught on the threads of the left-side screw thread 13, and can be easily moved along the shaft member 2.

[0022] The right-side adjustment plate 4 is made of stainless steel, and has a right-side through-hole 18 formed on its side through which the shaft member 2 is inserted. The right-side adjustment plate 4 is attached to the right side of the shaft member 2 with the shaft member 2 inserted through the right-side through-hole 18. The right-side adjustment plate 4 is attached to the shaft member 2 by disposing a right-side thread nut 6a (right-side thread nut 6b) screwed onto the right-side thread 14 of the shaft member 2 on the end side (center side) of the shaft member 2. That is, the right-side adjustment plate 4 is attached to the shaft member 2 while a force moving it toward the end side of the shaft member 2 acts due to the elastic force of the egg-shaped cutting blade body 16 described later, but the force moving it toward the end side of the shaft member 2 is blocked by the right-side thread nut 6a. In addition, the diameter of the right-side through-hole 18 of the right-side adjustment plate 4 is approximately the same as the diameter of the thread root of the right-side thread 14 of the shaft member 2, so that the right-side adjustment plate 4 can be moved along the right-side thread 14 of the shaft member 2 by rotating the right-side adjustment plate 4. In this embodiment, the right-side adjustment plate 4 is attached to the shaft member 2 by arranging the right-side thread nut 6a (right-side thread nut 6b) screwed onto the right-side thread 14 of the shaft member 2 on the end side (center side) of the shaft member 2, but this is not limited thereto, and the right-side adjustment plate 4 may be attached to the shaft member 2 by arranging the left-side thread nut 5a (left-side thread nut 5b) screwed onto the left-side thread 13 of the shaft member 2 on the end side (center side) of the shaft member 2. Also, in this embodiment, the diameter of the right-side through-hole 18 of the right-side adjustment plate 4 is approximately the same as the diameter of the thread root of the right-side thread 14 of the shaft member 2, but this is not limited thereto, and the right-side adjustment plate 4 may be larger than the diameter of the thread of the right-side thread 14 of the shaft member 2. In this way, by making the diameter of the right-side through hole 18 of the right-side adjustment plate 4 larger than the diameter of the threads of the right-side screw thread 14 of the shaft member 2, the right-side adjustment plate 4 can move smoothly over the upper part of the threads of the right-side screw thread 14 without getting caught on the threads of the right-side screw thread 14, and can be easily moved along the shaft member 2.

[0023] The left rope connector 7 is attached to the left end of the shaft member 2, and the wire rope 15a is attached to it (see Figs. 4 and 5). Specifically, the left rope connector 7 is composed of an eye nut. The shaft member 2 is inserted into the insertion hole 7a of the eye nut, and the tightening nut 7b is screwed onto the inserted shaft member 2, so that the left rope connector 7 is attached to the left end of the shaft member 2. A slip-out prevention pin 22 is inserted into the pin insertion hole 2a formed at the left end of the shaft member 2, so that the tightening nut 7b screwed onto the shaft member 2 is prevented from coming off the shaft member 2. In this embodiment, the wire rope 15a is attached to the left rope connector 7, but this is not limiting, and a rope other than the wire rope 15a may be attached to it.

[0024] The right rope connector 8 is attached to the right end of the shaft member 2, and the wire rope 15b is attached to it (see Figs. 4 and 5). Specifically, the right rope connector 8 is also composed of an eye nut. Similarly to the left rope connector 7, the right rope connector 8 is attached to the right end of the shaft member 2 by inserting the shaft member 2 into the insertion hole 8a of the eye nut and screwing the tightening nut 8b to the inserted shaft member 2. In addition, a slip-out prevention pin 22 is inserted into the pin insertion hole 2a formed in the right end of the shaft member 2 to prevent the tightening nut 8b screwed to the shaft member 2 from coming off the shaft member 2. In this embodiment, the wire rope 15b is attached to the right rope connector 8, but this is not limited to the above, and a rope other than the wire rope 15b may be attached to it.

[0025] The left-facing cutting blades 9 are made of stainless steel, and a plurality of them are provided around the shaft member 2 at intervals between the left-side adjustment plate 3 and the right-side adjustment plate 4, while rotating diagonally leftward with respect to the longitudinal direction of the shaft member 2. Similarly, the right-facing cutting blades 10 are made of stainless steel, and a plurality of them are provided around the shaft member 2 at intervals between the left-side adjustment plate 3 and the right-side adjustment plate 4, while rotating diagonally rightward with respect to the longitudinal direction of the shaft member 2. In this way, the left-facing cutting blade 9 is arranged around the shaft member 2 between the left-side adjustment plate 3 and the right-side adjustment plate 4, rotated diagonally leftward with respect to the longitudinal direction of the shaft member 2, and the right-facing cutting blade 10 is arranged around the shaft member 2, rotated diagonally rightward with respect to the longitudinal direction of the shaft member 2. As a result, the left-facing cutting blade 9 and the right-facing cutting blade 10 are arranged in a crossed diagonal grid pattern, and the overall external shape of the egg-shaped cutting blade body 16 is formed to be approximately egg-shaped. And, where the left-facing cutting blade 9 intersects with the right-facing cutting blade 10, the left-facing cutting blade 9 is arranged above the right-facing cutting blade 10 (below the right-facing cutting blade 10) → below the right-facing cutting blade 10 (upper part of the right-facing cutting blade 10) → above the right-facing cutting blade 10 (lower part of the right-facing cutting blade 10), and where the right-facing cutting blade 10 intersects with the left-facing cutting blade 9, the right-facing cutting blade 10 is arranged above the left-facing cutting blade 9 (lower part of the left-facing cutting blade 9) → below the left-facing cutting blade 9 (upper part of the left-facing cutting blade 9) → above the left-facing cutting blade 9 (lower part of the left-facing cutting blade). In this way, the left-facing cutting blade 9 intersects with the right-facing cutting blade 10 while entangled, so that the shape of the egg-shaped cutting blade body 16 is not easily deformed. Also, the longitudinal cross sections of the left-facing cutting blade 9 and the right-facing cutting blade 10 are formed in a substantially inverted trapezoidal shape (see FIG. 1(d)). In this way, since the longitudinal cross sections of the left-facing cutting blade 9 and the right-facing cutting blade 10 are formed in a substantially inverted trapezoidal shape, protrusions such as tree roots 12 protruding into the pipeline 11 can be efficiently removed.

[0026] Next, a procedure for changing and maintaining the length between the left and right adjustment plates 3 and 4 of the rolling cutter 1 in the first embodiment of the present invention will be described with reference to Fig. 3. Here, Fig. 3 is a diagram showing a procedure for changing and maintaining the length between the left and right adjustment plates of the rolling cutter in the first embodiment of the present invention.

[0027] The procedure for narrowing the length between the left and right adjustment plates 3 and 4 of the rolling cutter 1 will be explained below, but as the procedure for widening the length between the left and right adjustment plates 3 and 4 of the rolling cutter 1 can be easily understood from the procedure for narrowing the length between the left and right adjustment plates 3 and 4 of the rolling cutter 1, an explanation of this will be omitted.

[0028] When narrowing the length between the left adjustment plate 3 and the right adjustment plate 4 of the rolling cutter 1, the operator holds the shaft member 2 and rotates the entire egg-shaped cutting blade body 16 in a counterclockwise direction when viewed from the left, and after the rotation of the egg-shaped cutting blade body 16 is completed, the operator can move the left-hand thread nut 5a (right-hand thread nut 6a) screwed into the left-hand thread 13 (right-hand thread 14) of the shaft member 2 toward the center of the shaft member 2, thereby moving the left-hand adjustment plate 3 and the right-hand adjustment plate 4 in the direction narrowing the length between them. Specifically, when rotating the egg-shaped cutting blade body 16, if the left-hand thread nut 5b (right-hand thread nut 6b) screwed onto the left-hand thread 13 (right-hand thread 14) of the shaft member 2 is in contact with the right end portion (left end portion) of the left-side adjustment plate 3 (right-side adjustment plate 4), first, the left-hand thread nut 5b (right-hand thread nut 6b) in contact with the right end portion (left end portion) of the left-side adjustment plate 3 (right-side adjustment plate 4) is moved toward the center of the shaft member 2 along the left-hand thread 13 (right-hand thread 14) of the shaft member 2, and the left-hand thread nut 5b (right-hand thread nut 6b) is moved to a predetermined position toward the center of the shaft member 2, and then the entire egg-shaped cutting blade body 16 is rotated counterclockwise when viewed from the left side until it comes into contact with the moved left-hand thread nut 5b (right-hand thread nut 6b). Here, the "predetermined position" in "moving the left thread nut 5b (right thread nut 6b) to a predetermined position toward the center of the shaft member 2" refers to a position to which the left adjustment plate 3 (right adjustment plate 4) is moved toward the center. Then, after completing the rotation of the egg-shaped cutting blade body 16, the left thread nut 5a (right thread nut 6a) screwed onto the left thread 13 (right thread 14) of the shaft member 2 is rotated toward the center of the shaft member 2 to the position to which the egg-shaped cutting blade body 16 has been rotated. In other words, the left thread nut 5a (right thread nut 6a) is rotated toward the center of the shaft member 2 to a position where it contacts the left adjustment plate 3 (right adjustment plate 4) of the rolling cutter 1.In this way, the entire egg-shaped cutting blade body 16 is rotated counterclockwise when viewed from the left side until it comes into contact with the left-handed thread nut 5b (right-handed thread nut 6b) that has been rotated toward the center of the shaft member 2, and the left-handed thread nut 5a (right-handed thread nut 6a) is rotated toward the center of the shaft member 2 to the rotated position of the egg-shaped cutting blade body 16, that is, to the position where it comes into contact with the left-handed adjustment plate 3 (right-handed adjustment plate 4) of the rolling cutter 1, thereby tightening and fixing the left-handed thread nut 5a (right-handed thread nut 6a) and the left-handed thread nut 5b (right-handed thread nut 6b). In this embodiment, the left screw thread 13 is threaded on the left end side of the shaft member 2, and the right screw thread 14 is threaded on the right end side, and the diameter of the left through hole 17 (right through hole 18) of the left adjustment plate 3 (right adjustment plate 4) is approximately the same as the diameter of the thread root of the left screw thread 13 (right screw thread 14) of the shaft member 2. Therefore, by rotating the left adjustment plate 3 (right adjustment plate 4), the left adjustment plate 3 (right adjustment plate 4) moves toward the center of the shaft member 2 along the left screw thread 13 (right screw thread 14) of the shaft member 2, and the left adjustment plate 3 and the right adjustment plate 4 can be moved in a direction approaching each other. In this way, by rotating the egg-shaped cutting blade body 16, the left screw thread nut 5 (5a, 5b), and the right screw thread nut 6 (6a, 6b) toward the center of the shaft member 2, respectively, the length between the left adjustment plate 3 and the right adjustment plate 4 can be easily moved in a direction narrowing. By moving the left adjustment plate 3 and the right adjustment plate 4 in a direction in which the distance between them becomes narrower, the cross-sectional diameter of the egg-shaped cutting blade body 16 can be increased and maintained.

[0029] In addition, when moving only the left adjustment plate 3 or the right adjustment plate 4 to narrow the length between the left adjustment plate 3 and the right adjustment plate 4, the operator rotates only the left adjustment plate 3 or the right adjustment plate 4 in a "counterclockwise direction when looking at the entire egg-shaped cutting blade body 16 from the left side," and after the rotation of one of the left adjustment plate 3 or the right adjustment plate 4 is completed, one of the left thread nut 5a (right thread nut 6a) screwed into the left thread 13 (right thread 14) of the shaft member 2 is moved toward the center of the shaft member 2, thereby moving one of the left adjustment plate 3 or the right adjustment plate 4 in the direction narrowing the length between the left adjustment plate 3 and the right adjustment plate 4. Furthermore, if the diameter of the left side through hole 17 (right side through hole 18) of the left side adjustment plate 3 (right side adjustment plate 4) is formed larger than the diameter of the thread of the left screw thread 13 (right side screw thread 14) of the shaft member 2, the left side adjustment plate 3 (right side adjustment plate 4) can be moved by sliding it along the shaft member 2 on the upper part of the thread of the left side screw thread 13 (right side screw thread 14). In this way, when the diameter of the left side through hole 17 (right side through hole 18) of the left side adjustment plate 3 (right side adjustment plate 4) is formed larger than the diameter of the thread of the left thread 13 (right side thread 14) of the shaft member 2, by rotating the left thread nut 5 (right thread nut 6), the egg-shaped cutting blade body 16 (left side adjustment plate 3 (right side adjustment plate 4)) slides along the upper part of the thread of the left thread 13 (right side thread 14) along the shaft member 2, so that the left side adjustment plate 3 (right side adjustment plate 4) can be easily moved in the direction narrowing the length between the left side adjustment plate 3 and the right side adjustment plate 4 by simply rotating the left thread nut 5 (right thread nut 6). In this embodiment, the egg-shaped cutting blade body 16 is rotated, and after the rotation of the egg-shaped cutting blade body 16 is completed, the left-hand thread nut 5a (right-hand thread nut 6a) screwed onto the left-hand thread 13 (right-hand thread 14) of the shaft member 2 is moved toward the center of the shaft member 2, but this is not limited to the above, and the rotation of the egg-shaped cutting blade body 16 and the rotation of the left-hand thread nut 5 (right-hand thread nut 6) may be performed in parallel.By doing this, a left-hand thread 13 is threaded on the left end side of the shaft member 2 and a right-hand thread 14 is threaded on the right end side, and the diameter of the left-hand through hole 17 (right-hand through hole 18) of the left-hand adjustment plate 3 (right-hand adjustment plate 4) of the egg-shaped cutting blade body 16 is approximately the same diameter as the thread root diameter of the left-hand thread 13 (right-hand thread 14) of the shaft member 2.Therefore, the left-hand adjustment plate 3 (right-hand adjustment plate 4) and the left-hand thread nut 5 (right-hand thread nut 6) are rotated while being screwed into the left-hand thread 13 (right-hand thread 14) of the shaft member 2, and the left-hand adjustment plate 3 (right-hand adjustment plate 4) can be easily moved in the direction narrowing the length between the left-hand adjustment plate 3 and the right-hand adjustment plate 4.

[0030] In this way, with the left-hand thread nut 5 and / or the right-hand thread nut 6 screwed into the left-hand thread 13 and / or the right-hand thread nut 6b screwed into the right-hand thread 14 of the shaft member 2, the left-side adjustment plate 3 (right-side adjustment plate 4) is rotated in a counterclockwise direction as viewed from the left side until it comes into contact with the left-hand thread nut 5b screwed into the left-hand thread 13 of the shaft member 2 and / or the right-hand thread nut 6b screwed into the right-hand thread 14 of the shaft member 2, and after the rotation of the egg-shaped cutting blade body 16 is completed, the left-hand thread nut 5a screwed into the left-hand thread 13 of the shaft member 2 and / or the right-hand thread nut 6a screwed into the right-hand thread 14 of the shaft member 2 is rotated toward the center of the shaft member 2 until it comes into contact with the left-side adjustment plate 3 (right-side adjustment plate 4) of the rolling cutter 1, thereby changing and maintaining the length between the left-side adjustment plate 3 and the right-side adjustment plate 4 in the narrowing direction. This allows the length between the left adjustment plate 3 and the right adjustment plate 4 to be changed and maintained in the narrowing direction, so that no other equipment is required for changing and maintaining the cross-sectional diameter of the egg-shaped cutting blade body 16, and the cross-sectional diameter of the egg-shaped cutting blade body 16 can be easily increased (changed) through work that does not generate a large load.

[0031] Next, a working state using the rolling cutter in the first embodiment of the present invention will be described with reference to Fig. 4. Here, Fig. 4 is a schematic diagram showing a working state using the rolling cutter in the first embodiment of the present invention.

[0032] The rolling cutter 1 is disposed in the pipeline 11 with the wire rope 15 (15a, 15b) connected to the left rope connector 7 (right rope connector 8), and the outer diameter of the egg-shaped cutting blade body 16 of the rolling cutter 1 is adjusted so that the outer shape is in contact with the pipeline 11. In this state, the wire rope 15a connected to the left rope connector 7 of the rolling cutter 1 is connected from the manhole 20a to the winch 21a on the ground via the pulley 19a, and the wire rope 15b connected to the right rope connector 8 is connected from the manhole 20b to the winch 21b on the ground via the pulley 19b. When the wire rope 15a is wound up by the winch 21a, the rolling cutter 1 moves in the direction of the manhole 20a, and when the wire rope 15b is wound up by the winch 21b, the rolling cutter 1 moves in the direction of the manhole 20b.

[0033] Next, a construction method using a rolling cutter in a first embodiment of the present invention will be described with reference to Figures 4 and 5. Here, Figure 5(a) is a diagram showing the state before tree roots protruding into a pipeline are cut off by the rolling cutter in the first embodiment of the present invention, Figure 5(b) is a diagram showing the state when the tree roots protruding into a pipeline are cut off by the rolling cutter, and Figure 5(c) is a diagram showing the state after the tree roots protruding into a pipeline have been cut off by the rolling cutter.

[0034] The wire rope 15b is slowly wound by a worker on the ground using the winch 21b. As a result, the rolling cutter 1 moves little by little in the pipeline 11 toward the manhole 20b. As the rolling cutter 1 moves little by little in the pipeline 11 toward the manhole 20b in this way, the rolling cutter 1, which is arranged so that its outer shape is in contact with the pipeline 11, has an egg-shaped cutting blade body 16 in a diagonal lattice shape with a left-facing cutting blade 9 and a right-facing cutting blade 10 crossed, so that even if a tree root 12 (hard protrusion) protrudes into the pipeline 11, the tree root 12 (hard protrusion) protruding into the pipeline 11 can be easily cut and removed by being pinched between the "diagonal lattice-shaped left-facing cutting blade 9 and right-facing cutting blade 10" (see FIG. 5). Furthermore, since the longitudinal cross sections of the left-facing cutting blade 9 and the right-facing cutting blade 10 are formed in a substantially inverted trapezoidal shape, protrusions such as tree roots 12 protruding into the pipeline 11 can be efficiently removed. Furthermore, when the rolling cutter 1 is used with pipelines 11 of different diameters, as described above, the length between the left-side adjustment plate 3 and the right-side adjustment plate 4 can be easily changed and maintained by rotating the entire oval cutting blade body 16 in the same circumferential direction, and the cross-sectional diameter of the rolling cutter 1 (oval cutting blade body 16) can be easily changed and maintained. Therefore, no other equipment is required for changing and maintaining the cross-sectional diameter of the oval cutting blade body 16, and the cross-sectional diameter of the oval cutting blade body 16 can be easily changed and maintained by work that does not generate a large load.

[0035] Second embodiment Next, a rolling cutter according to a second embodiment of the present invention will be described with reference to the drawings, in which Fig. 6(a) is a right perspective view of the rolling cutter according to the second embodiment of the present invention, Fig. 6(b) is a front view of the same rolling cutter, Fig. 6(c) is a side view of the same rolling cutter, and Fig. 6(d) is a view showing longitudinal cross sections of the left-facing cutting blade and the right-facing cutting blade of the same rolling cutter.

[0036] The difference between the second embodiment and the first embodiment is that in the first embodiment, the left adjustment plate 3 is a separate member from the left thread nut 5 (5a, 5b) screwed onto the left thread 13 of the shaft member 2, and the right adjustment plate 4 is a separate member from the right thread nut 6 (6a, 6b) screwed onto the right thread 14 of the shaft member 2, whereas in the second embodiment, the left adjustment plate 33 is integrally formed by welding with the left thread nut 35 (35a, 35b) screwed onto the left thread 13 of the shaft member 2, and the right adjustment plate 34 is integrally formed by welding with the right thread nut 36 (36a, 36b) screwed onto the right thread 14 of the shaft member 2 (see FIG. 6). In the second embodiment, the same reference numerals are used for the same components as in the first embodiment, and the same functions and effects are achieved, so that the description will be omitted. Here, the shaft member 2 used in the second embodiment is the same as the shaft member 2 used in the first embodiment.

[0037] The left side adjustment plate 33 is made of stainless steel, has a left side through hole 37 formed in its side surface through which the shaft member 2 is inserted, and is attached to the left side of the shaft member 2 with the shaft member 2 inserted through the left side through hole 37. Specifically, the left side adjustment plate 33 has a left thread nut 35a welded to the end side of the shaft member 2 and a left thread nut 35b welded to the center side of the shaft member 2, and is integrally configured with the left thread nut 35 (35a, 35b) screwed onto the left thread 13 of the shaft member 2. The diameter of the left side through hole 37 of the left side adjustment plate 33 is formed to be larger than the diameter of the thread of the left thread 13 of the shaft member 2. In this embodiment, the left-side adjusting plate 33 is configured integrally with the left-side thread nut 35 (35a, 35b) screwed onto the left-side thread 13 of the shaft member 2 by welding the left-side thread nut 35a (left-side thread nut 35b) to the end side (center side) of the shaft member 2, but this is not limited thereto, and the left-side adjusting plate 33 may be configured integrally with the right-side thread nut 36 screwed onto the right-side thread 14 of the shaft member 2. Also, in this embodiment, the diameter of the left-side through hole 37 of the left-side adjusting plate 33 is formed to be larger than the diameter of the thread of the left-side thread 13 of the shaft member 2, but this is not limited thereto, and the diameter of the left-side through hole 37 of the left-side adjusting plate 33 may be approximately the same diameter as the diameter of the thread root of the left-side thread 13 of the shaft member 2. Furthermore, in this embodiment, the left-hand thread nut 35a is welded to the end side of the shaft member 2, and the left-hand thread nut 35b is welded to the center side of the shaft member 2, but this is not limited to this, and the left-hand thread nut 35a or the left-hand thread nut 35b may be welded to at least one of the end side or the center side of the shaft member 2.

[0038] The right-side adjustment plate 34 is made of stainless steel, has a right-side through-hole 38 formed in its side surface through which the shaft member 2 is inserted, and is attached to the right side of the shaft member 2 with the shaft member 2 inserted through the right-side through-hole 38. Specifically, the right-side adjustment plate 34 has a right-side thread nut 36a welded to the end side of the shaft member 2 and a right-side thread nut 36b welded to the center side of the shaft member 2, and is integrally configured with the right-side thread nut 36 (36a, 36b) screwed onto the right-side thread 14 of the shaft member 2. The diameter of the right-side through-hole 38 of the right-side adjustment plate 34 is formed to be larger than the diameter of the thread of the right-side thread 14 of the shaft member 2. In this embodiment, the right-side adjustment plate 34 has the right-side thread nut 36a (right-side thread nut 36b) welded to the end side (center side) of the shaft member 2, and is configured integrally with the right-side thread nut 36 (36a, 36b) screwed onto the right-side thread 14 of the shaft member 2, but this is not limited thereto, and the right-side adjustment plate 34 may be configured integrally with the left-side thread nut 35 screwed onto the left-side thread 13 of the shaft member 2. Also, in this embodiment, the diameter of the right-side through hole 38 of the right-side adjustment plate 34 is formed larger than the diameter of the thread of the right-side thread 14 of the shaft member 2, but this is not limited thereto, and the diameter of the right-side through hole 38 of the right-side adjustment plate 34 may be approximately the same diameter as the diameter of the thread root of the right-side thread 14 of the shaft member 2. Furthermore, in this embodiment, the right-side adjustment plate 34 has a right-hand thread nut 36a welded to the end side of the shaft member 2, and a right-hand thread nut 36b welded to the center side of the shaft member 2, but this is not limited to this, and the right-hand thread nut 36a or the right-hand thread nut 36b may be welded to at least one of the end side or the center side of the shaft member 2.

[0039] In the second embodiment, the left thread nut 35 (35a, 35b) and the right thread nut 36 (36a, 36b) constitute an adjustment plate length change and maintenance means for changing and maintaining the length between the left adjustment plate 33 and the right adjustment plate 34. Note that in this embodiment, the adjustment plate length change and maintenance means is constituted by the left thread nut 35 and the right thread nut 36, but is not limited to this. As in the first embodiment, the adjustment plate length change and maintenance means may be constituted by the left thread nut 35a and / or the right thread nut 36a, or the adjustment plate length change and maintenance means may be constituted by either the left thread nut 35 or the right thread nut 36, or the adjustment plate length change and maintenance means may be constituted by the left thread nut 35 and the right thread nut 36, and the left thread 13 on one end side of the shaft member 2 and the right thread 14 on the other end side.

[0040] Next, a procedure for changing and maintaining the length between the left adjustment plate 33 and the right adjustment plate 34 of the rolling cutter 31 in the second embodiment of the present invention will be described with reference to Fig. 7. Here, Fig. 7 is a diagram showing a procedure for changing and maintaining the length between the left adjustment plate and the right adjustment plate of the rolling cutter in the second embodiment.

[0041] The procedure for narrowing the length between the left adjustment plate 33 and the right adjustment plate 34 of the rolling cutter 31 will be explained below, but as the procedure for widening the length between the left adjustment plate 33 and the right adjustment plate 34 of the rolling cutter 31 can be easily understood from the procedure for narrowing the length between the left adjustment plate 33 and the right adjustment plate 34 of the rolling cutter 31, an explanation of this will be omitted.

[0042] When narrowing the distance between the left adjustment plate 33 and the right adjustment plate 34 of the rolling cutter 31, the operator rotates the entire egg-shaped cutting blade body 16 in a counterclockwise direction as viewed from the left side while holding the shaft member 2, thereby moving the left adjustment plate 33 and the right adjustment plate 34 in a direction narrowing the distance between them. That is, the left thread nut 35 (35a, 35b) integrally provided on the left adjustment plate 33 moves toward the center of the shaft member 2 while being screwed into the left thread 13 on the left end side of the shaft member 2, and the right thread nut 36 (36a, 36b) integrally provided on the right adjustment plate 34 moves toward the center of the shaft member 2 while being screwed into the right thread 14 on the right end side of the shaft member 2, so that the left adjustment plate 33 and the right adjustment plate 34 can be moved in a direction approaching each other. In this way, by rotating the egg-shaped cutting blade body 16 in the counterclockwise direction (one rotation direction), the length between the left adjustment plate 33 and the right adjustment plate 34 can be moved in a direction narrowing, and the cross-sectional diameter of the egg-shaped cutting blade body 16 can be easily changed and maintained. When moving only the left adjustment plate 33 or the right adjustment plate 34, as in the first embodiment, only the left adjustment plate 33 or the right adjustment plate 34 can be rotated to move the left thread nut 35 (35a, 35b) integrally provided with the left adjustment plate 33 or the right thread nut 36 (36a, 36b) integrally provided with the right adjustment plate 34 toward the center of the shaft member 2 while being screwed into the left thread 13 or the right thread 14 of the shaft member 2.

[0043] In this way, since the left-hand thread nut 35 (right-hand thread nut 36) is attached integrally to the left-side adjustment plate 33 (right-side adjustment plate 34), the oval cutting blade body 16 can be rotated together with the left-side adjustment plate 33 (right-side adjustment plate 34), and the length between the left-side adjustment plate 33 and the right-side adjustment plate 34 can be easily changed and maintained. Also, by rotating the oval cutting blade body 16 together with the left-side adjustment plate 33 (right-side adjustment plate 34), the length between the left-side adjustment plate 33 and the right-side adjustment plate 34 can be changed and maintained, so that no other equipment is required for changing and maintaining the cross-sectional diameter of the oval cutting blade body 16, and the cross-sectional diameter of the oval cutting blade body 16 can be easily increased and maintained (changed and maintained) by work that does not generate a large load.

[0044] Third embodiment Next, a rolling cutter according to a third embodiment of the present invention will be described with reference to the drawings, in which Fig. 8(a) is a right perspective view of the rolling cutter according to the third embodiment of the present invention, Fig. 8(b) is a front view of the same rolling cutter, Fig. 8(c) is a side view of the same rolling cutter, and Fig. 8(d) is a view showing longitudinal cross sections of the left-facing cutting blade and the right-facing cutting blade of the same rolling cutter.

[0045] The third embodiment differs from the first embodiment in that, in the first embodiment, the length between the left-side adjustment plate 3 and the right-side adjustment plate 4 is changed and maintained by changing the positions of the left-side thread nut 5 (5a, 5b) screwed onto the left-side thread 13 of the shaft member 2 and the right-side thread nut 6 (6a, 6b) screwed onto the right-side thread 14 of the shaft member 2, whereas in the third embodiment, a one-end pin insertion hole 45 (another-end pin insertion hole 47) is formed at one end (the other end) of the shaft member 42, and a one-end pin 46 (another-end pin 48) is inserted into the one-end pin insertion hole 45 (the other-end pin insertion hole 47) to change and maintain the length between the left-side adjustment plate 3 and the right-side adjustment plate 4 (see FIG. 8). In the third embodiment, the same reference numerals are used for the same components as in the first embodiment, and the same functions and effects are provided, so that the description thereof will be omitted.

[0046] The shaft member 42 is made of stainless steel and is formed in a rod shape consisting of a shaft bolt. Specifically, the shaft member 42 has eight one-end pin insertion holes 45 formed at a predetermined interval on the left end side, and eight other-end pin insertion holes 47 formed at a predetermined interval on the right end side. In this embodiment, eight one-end pin insertion holes 45 are formed at a predetermined interval on the left end side, and eight other-end pin insertion holes 47 are formed at a predetermined interval on the right end side, but this is not limited to the above. A plurality of one-end pin insertion holes 45 (4 to 10 (preferably, 6 to 10 (more preferably, 6 to 8))) may be formed on the left end side, and a plurality of other-end pin insertion holes 47 (4 to 10 (preferably, 6 to 10 (more preferably, 6 to 8)))) may be formed on the right end side, or the one-end pin insertion holes 45 and the other-end pin insertion holes 47 may be formed in different numbers. Furthermore, a plurality of other end side pin insertion holes 47 (4 to 10 (preferably, 6 to 10 (more preferably, 6 to 8))) may be formed on the left end side, and a plurality of one end side pin insertion holes 45 (4 to 10 (preferably, 6 to 10 (more preferably, 6 to 8))) may be formed on the right end side. That is, the shaft member 42 may have a plurality of one end side pin insertion holes 45 (4 to 10 (preferably, 6 to 10 (more preferably, 6 to 8))) formed on the one end side, and a plurality of other end side pin insertion holes 47 (4 to 10 (preferably, 6 to 10 (more preferably, 6 to 8))) formed on the other end side. Also, the one end side pin insertion holes 45 (other end side pin insertion holes 47) do not have to be provided at a predetermined interval.

[0047] As with the left side adjustment plate 3 (right side adjustment plate 4) of the first embodiment, the diameter of the left side through hole 17 (right side through hole 18) of the left side adjustment plate 3 (right side adjustment plate 4) is approximately the same as the diameter of the thread root of the right-handed thread 14 of the shaft member 42. This allows the left side adjustment plate 3 (right side adjustment plate 4) to move along the left side thread 13 (right side thread 14) of the shaft member 42 by rotating the left side adjustment plate 3 (right side adjustment plate 4). Note that in this embodiment, the diameter of the left side through hole 17 (right side through hole 18) of the left side adjustment plate 3 (right side adjustment plate 4) is approximately the same as the diameter of the thread root of the left side thread 13 (right side thread 14) of the shaft member 42, but is not limited thereto, and may be larger than the diameter of the thread of the left side thread 13 (right side thread 14) of the shaft member 42, as in the first embodiment. In this way, by making the diameter of the left side through hole 17 (right side through hole 18) of the left side adjustment plate 3 (right side adjustment plate 4) larger than the diameter of the threads of the left screw thread 13 (right side screw thread 14) of the shaft member 42, the left side adjustment plate 3 (right side adjustment plate 4) can move smoothly over the upper part of the threads of the left screw thread 13 (right side screw thread 14) without getting caught on the threads of the left screw thread 13 (right side screw thread 14), and can be easily moved along the shaft member 42.

[0048] In this way, in the third embodiment, the length between the left adjustment plate 3 and the right adjustment plate 4 can be changed and maintained by changing the positions of the one-end side pin 46 inserted into the one-end side pin insertion hole 45 of the shaft member 42 and the other-end side pin 48 inserted into the other-end side pin insertion hole 47 of the shaft member 42.Therefore, the one-end side pin 46 inserted into the one-end side pin insertion hole 45 of the shaft member 42 and the other-end side pin 48 inserted into the other-end side pin insertion hole 47 of the shaft member 42 form an adjustment plate length change and maintenance means for changing and maintaining the length between the left adjustment plate 3 and the right adjustment plate 4. In this embodiment, the adjustment plate length change maintaining means is constituted by the one end side pin 46 and the other end side pin 48, but this is not limited to the above, and the adjustment plate length change maintaining means may be constituted by either the one end side pin 46 or the other end side pin 48, or the adjustment plate length change maintaining means may be constituted by the one end side pin 46 and the other end side pin 48, and the one end side pin insertion hole 45 and the other end side pin insertion hole 47 of the shaft member 42, and further, as in the first embodiment, the adjustment plate length change maintaining means may be constituted by the left thread 13 on the left end side (one end side or the other end side) and the right end side (the other end side or the one end side) of the shaft member 42. That is, in the third embodiment, the length between the adjustment plates is changed and maintained by removing the one end side pin 46 from the one end side pin insertion hole 45 of the shaft member 42 and inserting it into the other end side pin insertion hole 45, and / or removing the other end side pin 48 from the other end side pin insertion hole 47 of the shaft member 42 and inserting it into the other other end side pin insertion hole 47, thereby changing and maintaining the length between the left side adjustment plate 3 and the right side adjustment plate 4.

[0049] Next, a procedure for changing and maintaining the length between the left and right adjustment plates 3 and 4 of the rolling cutter 41 in the third embodiment of the present invention will be described with reference to Fig. 9. Here, Fig. 9 is a diagram showing a procedure for changing and maintaining the length between the left and right adjustment plates of the rolling cutter in the third embodiment of the present invention.

[0050] The procedure for narrowing the length between the left adjustment plate 3 and the right adjustment plate 4 of the rolling cutter 41 will be explained below, but as the procedure for widening the length between the left adjustment plate 3 and the right adjustment plate 4 of the rolling cutter 41 can be easily understood from the procedure for narrowing the length between the left adjustment plate 3 and the right adjustment plate 4 of the rolling cutter 41, an explanation of this will be omitted.

[0051] When narrowing the distance between the left and right adjustment plates 3 and 4 of the rolling cutter 41, the operator rotates the entire egg-shaped cutting blade body 16 counterclockwise as viewed from the left while holding the shaft member 42, and moves the left and right adjustment plates 3 and 4 in a direction that narrows the distance between them. Then, the operator removes the one-end pin 46 (the other-end pin 48) inserted into the one-end pin insertion hole 45 (the other-end pin insertion hole 47) on the end side of the shaft member 42, and inserts the removed one-end pin 46 (the other-end pin 48) into the one-end pin insertion hole 45 (the other-end pin insertion hole 47) on the center side of the shaft member 42, thereby changing and maintaining the distance between the left and right adjustment plates 3 and 4. In this way, the rolling cutter 41 of the third embodiment can be moved in a direction narrowing the length between the left adjustment plate 3 and the right adjustment plate 4 by removing the one end side pin 46 and the other end side pin 48 and moving and inserting the removed one end side pin 46 and the other end side pin 48 into the one end side pin insertion hole 45 and the other end side pin insertion hole 47 in the direction narrowing the length between the left adjustment plate 3 and the right adjustment plate 4, and can easily change and maintain the cross-sectional diameter of the egg-shaped cutting blade body 16. Also, when moving only the left adjustment plate 3 or the right adjustment plate 4, either the one end side pin 46 or the other end side pin 48 inserted into the one end side pin insertion hole 45 or the other end side pin insertion hole 47 is removed, and the removed one end side pin 46 or the other end side pin 48 is moved and inserted into the one end side pin insertion hole 45 or the other end side pin insertion hole 47 in the direction narrowing the length between the left adjustment plate 3 and the right adjustment plate 4.

[0052] In this way, the shaft member 42 has eight one-end pin insertion holes 45 (other-end pin insertion holes 47) formed at predetermined intervals on one end side (other end side), and the one-end pins 46 (other end pins 48) are inserted into the one-end pin insertion holes 45 (other end pin insertion holes 47), so that the length between the left adjustment plate 3 and the right adjustment plate 4 can be easily changed and maintained. Since the length between the left adjustment plate 3 and the right adjustment plate 4 can be easily changed and maintained in this way, no other equipment is required for changing and maintaining the cross-sectional diameter of the oval cutting blade body 16, and the cross-sectional diameter of the oval cutting blade body 16 can be easily increased and maintained (changed and maintained) by work that does not generate a large load.

[0053] As described above, according to the rolling cutter 1 (31, 41) of this embodiment, the left-facing cutting blades 9 (right-facing cutting blades 10) are provided at intervals in the circumferential direction of the shaft member 2 (42) while rotating obliquely leftward (obliquely rightward) with respect to the longitudinal direction of the shaft member 2 (42) around the circumference of the shaft member 2 (42) between the left-side adjustment plate 3 (33) and the right-side adjustment plate 4 (34), and the left-facing cutting blades 9 and the right-facing cutting blades 10 are arranged in a crossed oblique lattice pattern. Therefore, even if a hard protruding object such as a tree root 12 protrudes into the pipeline 11, the egg-shaped cutting blade body 16 can be pulled without rotating. Furthermore, because the left-facing cutting blades 9 and right-facing cutting blades 10 are arranged in a diagonal grid pattern by intersecting them, even stubborn protrusions protruding into the pipeline 11 can be easily cut and removed by clamping them between the "diagonal grid pattern of left-facing cutting blades 9 and right-facing cutting blades 10." In addition, the cross-sectional diameter of the egg-shaped cutting blade body 16 can be changed and maintained by changing the length between the left-side adjustment plate 3 (33) and the right-side adjustment plate 4 (34). Therefore, no other equipment is required for changing and maintaining the cross-sectional diameter of the egg-shaped cutting blade body 16, and the cross-sectional diameter of the egg-shaped cutting blade body 16 can be easily changed and maintained through work that does not generate a large load.

[0054] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0055] 1. Rolling cutter 2 Shaft member 2a Pin insertion hole 3 Left adjustment plate 4 Right adjustment plate 5 Left-hand thread nut 6 Right Thread Nut 7 Left side rope connector 7a Insertion hole 7b Fastening nut 8 Right side rope connector 8a Insertion hole 8b Fastening nut 9 Left-facing cutting blade 10 Right-facing cutting blade 11 Conduit 12. Tree Roots 13 Left Thread 14 Right Thread 15a Wire Rope 15b Wire rope 16 Egg-shaped cutting blade 17 Left side through hole 18 Right side through hole 19a Gold wheel 19b Gold wheel 20a human hole 20b human hole 21a Winch 21b Winch 22 Anti-slip pin 31 Rolling Cutter 33 Left side adjustment plate 34 Right side adjustment plate 35 Left Thread Nut 36 Right Thread Nut 37 Left side through hole 38 Right side through hole 41 Rolling Cutter 42 Shaft member 45 Pin insertion hole on one end 46 One end pin 47 Other end side pin insertion hole 48 Other end pin

Claims

1. A rolling cutter that removes protruding objects in a pipeline by moving within the pipeline, A shaft member formed in a rod-like shape; a left side through hole through which the shaft member is inserted, and a left side adjustment plate attached to the left side of the shaft member in a state in which the shaft member is inserted into the left side through hole; a right adjustment plate having a right through hole through which the shaft member is inserted, the right adjustment plate being attached to the right side of the shaft member in a state in which the shaft member is inserted into the right through hole; a left rope connector attached to the left end of the shaft member and to which a rope is attached; a right rope connector attached to the right end of the shaft member and to which a rope is attached; A plurality of left-facing cutting blades are made of metal and are provided at intervals in the circumferential direction of the shaft member between the left adjustment plate and the right adjustment plate while rotating obliquely leftward with respect to the longitudinal direction of the shaft member around the circumference of the shaft member; A plurality of right-facing cutting blades are made of metal and are provided at intervals in the circumferential direction of the shaft member while rotating obliquely rightward with respect to the longitudinal direction of the shaft member around the circumference of the shaft member between the left adjustment plate and the right adjustment plate; and an adjustment plate length change and maintenance means for changing and maintaining the length between the left adjustment plate and the right adjustment plate, The left-facing cutting blade and the right-facing cutting blade are arranged in a crossed diagonal lattice pattern to form an egg-shaped cutting blade body having an overall outer shape that is approximately egg-shaped, The rolling cutter is characterized in that the inter-plate length change / maintenance means can change and maintain the cross-sectional diameter of the egg-shaped cutting blade body by changing the length between the left adjustment plate and the right adjustment plate.

2. The shaft member has a left-handed thread on one end and a right-handed thread on the other end, the inter-plate length change maintaining means is a left-hand thread nut screwed onto the left-hand thread of the shaft member and a right-hand thread nut screwed onto the right-hand thread of the shaft member, the left side adjustment plate is attached to the shaft member by disposing the left-hand thread nut screwed onto the left-hand thread of the shaft member on the end side of the shaft member, or disposing the right-hand thread nut screwed onto the right-hand thread of the shaft member on the end side of the shaft member; the right-side adjustment plate is attached to the shaft member by disposing the right-side thread nut screwed onto the right-side thread of the shaft member on the end side of the shaft member, or disposing the left-side thread nut screwed onto the left-side thread of the shaft member on the end side of the shaft member; 2. The rolling cutter according to claim 1, characterized in that the means for changing and maintaining the length between the adjustment plates changes the position of the right-hand thread nut screwed onto the right-hand thread of the shaft member and / or the position of the left-hand thread nut screwed onto the left-hand thread of the shaft member, thereby changing and maintaining the length between the left-hand adjustment plate and the right-hand adjustment plate.

3. The shaft member has a left-handed thread on one end and a right-handed thread on the other end, The rolling cutter described in claim 1, characterized in that the means for changing and maintaining the length between the adjustment plates is a left-hand thread adjustment plate nut screwed onto the left-hand thread of the shaft member integrally formed on the left-hand adjustment plate or the right-hand adjustment plate, and a right-hand thread adjustment plate nut screwed onto the right-hand thread of the shaft member integrally formed on the right-hand adjustment plate or the left-hand adjustment plate, and the length between the left-hand adjustment plate and the right-hand adjustment plate is changed and maintained by changing the position of the right-hand thread adjustment plate nut screwed onto the right-hand thread of the shaft member and / or the position of the left-hand thread adjustment plate nut screwed onto the left-hand thread of the shaft member.

4. The shaft member has a first end side pin insertion hole formed at a predetermined position on one end side, and a second end side pin insertion hole formed at a predetermined position on the other end side, the inter-plate length change maintaining means is a one-end side pin inserted into a one-end side pin insertion hole of the shaft member and an other-end side pin inserted into a other-end side pin insertion hole of the shaft member, the left adjustment plate is attached to the shaft member by the one end side pin inserted into the one end side pin insertion hole of the shaft member being disposed on the end side of the shaft member, or the other end side pin inserted into the other end side pin insertion hole of the shaft member being disposed on the end side of the shaft member, the right-side adjustment plate is attached to the shaft member by the other-end-side pin inserted into the other-end-side pin insertion hole of the shaft member being disposed on the end side of the shaft member, or the one-end-side pin inserted into the one-end-side pin insertion hole of the shaft member being disposed on the end side of the shaft member, The rolling cutter of claim 1, characterized in that the means for changing and maintaining the length between the adjustment plates changes and maintains the length between the left side adjustment plate and the right side adjustment plate by removing the one end side pin from the one end side pin insertion hole of the shaft member and inserting it into the other one end side pin insertion hole, and / or removing the other end side pin from the other end side pin insertion hole of the shaft member and inserting it into the other other end side pin insertion hole.

5. 2. The rolling cutter according to claim 1, wherein the left-hand cutting blade and the right-hand cutting blade have a cross section in the longitudinal direction that is substantially inverted trapezoidal.

Images