Cable cutter and its ring attachment

Abstract

To provide a cable cutter that has better working efficiency and better cutting efficiency, and its ring attachment.SOLUTION: A ring attachment 2 comprises: a housing 10 that has a hole H; a first blade 12 that has a first edge 12B; and a link plate 30 that makes transition of the first blade 12 from a normal state to a cutting state through a change in its position. In the normal state, the first blade 12 is arranged inside the housing 10 in a state where the first edge 12B is located outside an outer periphery of the hole H. A cable cutter 1 includes a ring attachment 2 and an arm device 4. The arm device 4 includes an arm part 44, a device-side movable part 41 that moves according to a movement of the arm part 44, and a device-side connection part 40 that is connectable to the ring attachment 2. The device-side movable part 41 moves to change the position of the link plate 30 in the ring attachment 2 connected by the device-side connection part 40.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cable cutter that cuts a target cable among a plurality of cables related to at least one of a control line, a communication line, and a power line, and to a ring attachment for the cable cutter. [Background technology]

[0002] A known cable cutter is described in Japanese Patent Laid-Open Publication No. 2000-50449 (Patent Document 1). With this cable cutter 1, the cable 5 to be cut is cut as follows: First, the operator wraps a loop formed by the wire 44, lower blade frames 31a, 31b, and lower blade 32 around one cable 5 to be cut out of multiple closely spaced cables in a location where the cables are not particularly densely packed. Next, the operator slides this loop to the position on the cable 5 to be cut. Next, the operator attaches the upper blade 22 and upper blade frame 21, which are separate from the loop, to the lower blade frames 31a, 31b, and manually turns the ball screw 12 to advance the upper blade 22 relative to the lower blade 32, thereby cutting the cable 5 at the position to be cut. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-50449 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-described cable cutter 1, the operator can wrap a ring-shaped body around the cable 5 by removing the wire 44 from the lower blade frames 31a, 31b, and by wrapping the ring-shaped body around the cable 5, the cable 5 to be cut can be cut while preventing accidental cutting due to the cable 5 being wrapped around other cables in close proximity. However, with such a ring-shaped body, the wire 44 may become detached while sliding to the cutting position, which may reduce the efficiency of the work. Furthermore, in the above-described cable cutter 1, the cable 5 is cut by manually turning the ball screw 12. Therefore, there is room for improvement in cutting efficiency.

[0005] A first main object of the present invention is to provide a cable cutter and a ring attachment thereof that are more efficient in operation. A second main object of the present invention is to provide a cable cutter and a ring attachment thereof that have superior cutting efficiency. [Means for solving the problem]

[0006] This specification discloses a ring attachment for a cable cutter. The ring attachment includes a housing and a blade having a cutting edge. The ring attachment may include a ring-side movable part that transitions the blade from a normal state to a cutting state by changing at least one of its position and attitude. A hole may be formed by at least one of the housing and the ring-side movable part in a normal state. The blade may be disposed inside at least one of the housing and the ring-side movable part with the cutting edge positioned outward from the outer periphery of the hole in a normal state. This specification also discloses a ring attachment for another cable cutter. The ring attachment includes a first blade having a first cutting edge and a second blade having a second cutting edge. The ring attachment may include a ring-side movable part that transitions at least one of the first blade and the second blade from a normal state to a cutting state by changing at least one of its position and attitude. The first blade may be disposed inside the housing with the first cutting edge positioned outward from the outer periphery of the hole in the normal state. The second blade may be disposed inside the housing with the second cutting edge positioned outward from the outer periphery of the hole in the normal state. The first cutting edge and the second cutting edge may be located inside the outer periphery of the hole in the cutting state. Additionally, this specification discloses a cable cutter. The cable cutter includes a ring attachment and an arm device. The arm device may include an arm portion. The arm device may include a device-side movable portion that moves in response to movement of the arm portion. The arm device may include a device-side connection portion that is connectable to the ring attachment. The device-side movable portion may change at least one of the position and posture of the ring-side movable portion in the ring attachment connected to the device-side connection portion by movement. This specification also discloses another cable cutter. This cable cutter includes a ring attachment and an electric device. The electric device may include a device-side movable part that moves electrically. The electric device may include a device-side connection part that can be connected to the ring attachment. The device-side movable part may change at least one of the position and posture of the ring-side movable part in the ring attachment connected to the device-side connection part by movement. [Effects of the Invention]

[0007] A first main effect of the present invention is to provide a cable cutter and its ring attachment that are more efficient to work with. A second main effect of the present invention is to provide a cable cutter and its ring attachment with superior cutting efficiency. [Brief explanation of the drawings]

[0008] [Figure 1] Fig. 1A is a front view of a cable cutter (in a cutting state) according to a first embodiment of the present invention, and Fig. 1B is a side view of Fig. 1A. [Figure 2] Fig. 2A is a rear view of the ring attachment in Fig. 1A in a normal state. Fig. 2B is a view of Fig. 2A during a cutting operation (cut state). Fig. 2C is a side view of Fig. 2A (excluding the cover). Fig. 2D is a side view of the cover. [Figure 3] Fig. 3A is a front view of the arm device (disconnected state) in Fig. 1A, and Fig. 3B is a side view of Fig. 3A. [Figure 4] Fig. 4A is a front view of a cable cutter (normal state) according to a second embodiment of the present invention, and Fig. 4B is a side view of Fig. 4A. [Figure 5] Figure 5A is a front view of the electric device (normal state) in Figure 4A, and Figure 5B is a side view of Figure 5A. [Figure 6] Fig. 6A is a front view of a cable cutter (cutting state) according to a third embodiment of the present invention, Fig. 6B is a side view of Fig. 6A, Fig. 6C is an enlarged view of the upper part of Fig. 6A in a normal state, and Fig. 6D is a front view of the ring attachment in Fig. 6C. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention and modifications thereof will be described with reference to the accompanying drawings. The present invention is not limited to the following embodiments and modifications.

[0010] [First form] Fig. 1A is a front view of a cable cutter 1 according to a first embodiment, and Fig. 1B is a side view of the cable cutter 1. The cable cutter 1 of the first embodiment has a ring attachment 2 and an arm device 4. Regarding various directions of the cable cutter 1, the left side of FIG. 1 is set to the left side of the cable cutter 1, and the top of FIG. 1 is set to the top of the cable cutter 1. Note that these directions may change depending on the state of the work and the movement of members and parts relative to other members and parts. For example, during many cutting operations, the ring attachment 2 is actually on the bottom side, and the arm device 4 is positioned so as to extend obliquely upward from the ring attachment 2. Note that these directions are set for convenience in order to facilitate explanation, and other directions may be set.

[0011] Fig. 2A is a front view of the ring attachment 2 in a normal state, and Fig. 2B is a view of Fig. 2A during the cutting operation. The ring attachment 2 is ring-shaped, and more specifically, is ring-shaped and cannot be opened or closed (unless it is broken). Note that the ring attachment 2 may be openable or closable (without being broken). The ring attachment 2 has a housing 10 , a first blade 12 , a second blade 14 , a first base portion 16 , a second base portion 17 , a ring-side link portion 18 , and a cover 19 .

[0012] The housing 10 is ring-shaped, and more specifically, is ring-shaped and cannot be opened or closed (unless damaged). The housing 10 has a circular outer shape. The housing 10 is made of plastic and includes a first housing 20 and a second housing 22 . The first housing 20 is shaped like a dish that extends vertically and horizontally, and has a first hole 20H in the center and a first cutout 20C below the first hole 20H. The first cutout 20C is recessed upward in an "∩" shape relative to the bottom edge of the first housing 20. The second housing 22 is shaped like a dish that extends vertically and horizontally, and has a second hole 22H in the center and a second cutout 22C below the second hole 22H. The second cutout 22C is recessed upward in an "∩" shape relative to the bottom edge of the second housing 22. The first housing 20 and the second housing 22 are joined together with a plurality of screws 24 extending in the front-rear direction, with the first housing 20 being disposed in front of the second housing 22. The first hole 20H and the second hole 22H are aligned in the front-to-rear direction and overlap when viewed from the front, forming a hole H in the ring attachment 2. The hole H is circular. At least one of the outer shape of the housing 10 and the shape of the hole H is not limited to a circle and may be, for example, a regular polygon. The number of divisions of the housing 10 is not limited to two and may be one (integrally formed) or three or more. Furthermore, the shape of at least one of the first housing 20 and the second housing 22 is not limited to a dish shape. In addition, the material of the housing 10 is not limited to plastic.

[0013] The first blade 12 is made of metal, has a plate shape, and is crescent-shaped when viewed from the front. The first blade 12 has an arc-shaped first cutting edge 12B. The radius of the arc of the first cutting edge 12B is greater than the radius of the hole H. The second blade 14 is made of metal, has a plate shape, and is crescent-shaped when viewed from the front. The second blade 14 has an arc-shaped second cutting edge 14B. The radius of the arc of the second cutting edge 14B is larger than the radius of the hole H. The first blade 12 and the second blade 14 are arranged in the housing 10 with the first cutting edge 12B and the second cutting edge 14B facing each other. The shape, material, arrangement of the cutting edge, etc. of at least one of the first blade 12 and the second blade 14 are not limited to those described above.

[0014] The first base portion 16 is made of metal and has a plate shape. A cylindrical first shaft portion 16X with its axial direction extending in the front-to-rear direction is provided in the center of the first base portion 16. The center portion of the first base portion 16 is exposed in a first cutout portion 20C. The first base portion 16 is fixed to the first housing 20 by a plurality of screws 26 extending in the front-to-rear direction around the first cutout portion 20C. The center portion of the first shaft portion 16X forms a first base-side connection hole 16J. The second base portion 17 is made of metal and has a plate shape. A cylindrical second shaft portion 17X with its axial direction extending in the front-to-rear direction is provided in the center of the second base portion 17. The center portion of the second base portion 17 is exposed at a second cutout portion 22C. The second base portion 17 is fixed to the second housing 22 by a plurality of screws 28 extending in the front-to-rear direction around the second cutout portion 22C. The center portion of the second shaft portion 17X forms a second base-side connecting hole 17J. A base-side locked hole 17H ​​is formed below the second shaft portion 17X. The first base-side connection hole 16J and the second base-side connection hole 17J are aligned in the front-to-rear direction and overlap when viewed from the front, forming a ring-side connection hole JH as the ring-side connection portion of the ring attachment 2. The ring-side connection hole JH is circular. The first blade 12 is provided so as to be rotatable about an imaginary axis in the front-to-rear direction relative to the first shaft 16X of the first base portion 16. The imaginary central axis of the rotation is located below the first blade 12 and coincides with the imaginary central axis of the first shaft 16X. The second blade 14 is provided so as to be rotatable about an imaginary axis in the front-to-rear direction relative to the second shaft portion 17X of the second base portion 17. The imaginary central axis of the rotation is located below the second blade 14 and coincides with the imaginary central axis of the second shaft portion 17X. The shape, material, size, etc. of at least one of the first base portion 16 and the second base portion 17 are not limited to those described above. The first base portion 16 and the second base portion 17 may be integral, or may be separated into three or more portions.

[0015] The ring side link portion 18 has a link plate 30 as a ring side movable portion. The link plate 30 is made of metal and has a plate shape. The link plate 30 has a ring-side contact portion 30C at the bottom. The link plate 30 is disposed between the first base portion 16 and the second base portion 17. The link plate 30 is movable in the up and down direction. The link plate 30 is slidable along the first base portion 16 and the second base portion 17. The link plate 30 is connected to the lower part of the first blade 12. The first blade 12 is rotatable relative to the link plate 30. The link plate 30 is connected to the lower part of the second blade 14. The second blade 14 is rotatable relative to the link plate 30. The link plate 30 remains in the position shown in FIG. 2A in a normal state (uncut state) due to the first base portion 16 and the second base portion 17.

[0016] The ring-side link portion 18 may further include one or more elastic bodies. The elastic body may be, for example, a metal spring. The elastic body may be disposed between the first base portion 16 and the second base portion 17, above the link plate 30. The elastic body may be disposed on the left and right sides of the ring-side connection hole JH. The elastic body may bias the link plate 30 downward. The shape, material, size, etc. of at least one of the link plate 30 and the elastic body are not limited to those described above.

[0017] 2A, in the normal state, the link plate 30 is positioned downward, and the first blade 12 and the second blade 14 connected to it are positioned outward in the left-right direction. In this state, the first cutting edge 12B is positioned radially outward from the outer periphery of the hole H. Also, the second cutting edge 14B is positioned radially outward from the outer periphery of the hole H. In addition, the upper edge of the center portion of the link plate 30 in the left-right direction is positioned below the lower edge of the base-side locking hole 17H. As shown in FIG. 2B , when the link plate 30 is pushed upward, the lower portion of the first blade 12 is pushed upward, causing the first blade 12 to rotate, and the upper portion of the first blade 12 moves inward in the left-right direction, so that the first cutting edge 12B enters radially inward from the outer periphery of the hole H. The lower portion of the second blade 14 is pushed upward, causing the second blade 14 to rotate, and the upper portion of the second blade 14 moves inward in the left-right direction, so that the second cutting edge 14B enters radially inward from the outer periphery of the hole H. The first cutting edge 12B then overlaps the second blade 14, and the second cutting edge 14B then overlaps the first blade 12. Part or all of the hole H is blocked between the first cutting edge 12B and the second cutting edge 14B. In other words, as the position of the link plate 30 changes from a lower position to an upper position, the first blade 12 and the second blade 14 transition from their normal state to their cutting state. In addition, the upper side of the central portion of the link plate 30 in the left-right direction is positioned above the lower side of the base-side locking hole 17H, and the central portion of the link plate 30 partially or entirely covers the base-side locking hole 17H. Note that only one of the first blade 12 and the second blade 14 may move. Furthermore, the movement of at least one of the first blade 12 and the second blade 14 is not limited to rotation, but may be, for example, sliding. Furthermore, the ring-side movable part may not be separate from the first blade 12 and the second blade 14, as in the case of the link plate 30, but may be integral with either the first blade 12 or the second blade 14. Additionally, either the first blade 12 or the second blade 14 may transition from a normal state to a cutting state due to a change in the posture of the link plate 30 (for example, from a forward leaning posture to a backward leaning posture), or may transition from a normal state to a cutting state based on both a change in position (movement) and a change in posture. Alternatively, there may be only one blade. In this case, only the first blade 12 having the first cutting edge 12B may be provided, and a cable movement restricting member that restricts the cable from moving relative to the first blade 12 may be provided instead of the second blade 14. The cable movement restricting member may be, for example, a member having a shape similar to that of the second blade 14 but not having the second cutting edge 14B. The cable movement restricting member may be fixed and not move. Three or more blades may be provided. Multiple blades and one cable movement restricting member may be combined, one blade and multiple cable movement restricting members may be combined, or multiple blades and multiple cable movement restricting members may be combined.

[0018] The width of the ring attachment 2 in the left-right direction is, for example, 13.5 cm (centimeters). The vertical length of the ring attachment 2 is, for example, 14 cm when the link plate 30 is normally positioned downward. The dimensions of the ring attachment 2 are not limited to those described above.

[0019] 2C is a side view of FIG. 2A (excluding cover 19), and FIG. 2D is a side view of cover 19. The cover 19 has a cover main body 19M and a plurality of (two) protrusions 19P serving as locking portions. The cover main body 19M is made of plastic and has a box shape with an open top and rear. Each of the protrusions 19P is made of metal and protrudes rearward from the rear surface of the front part of the cover main body 19M. Each of the protrusions 19P is fixed to the cover main body 19M. The protrusions 19P are lined up one above the other. The cover 19 is attached to the second base portion 17 and the ring side link portion 18 from the rear, covering a portion of the second base portion 17 and the ring side link portion 18 in a normal state. At this time, each protrusion 19P is inserted into the overlapping base side locking holes 17H and above the upper edge of the central portion of the link plate 30. This insertion prevents each protrusion 19P from moving the ring side link portion 18 relative to the second base portion 17. Therefore, when the cover 19 is attached, the rotational movement of the first blade 12 and the second blade 14 is prevented, and the first blade 12 and the second blade 14 are locked. Furthermore, each protrusion 19P is inserted so as to come into contact with at least one of the base side locking holes 17H and the link plate 30, preventing the cover 19 from unintentionally coming off due to friction. The shape, material, size, etc. of at least one of the cover main body 19M and each protrusion 19P are not limited to those described above. The cover main body 19M may cover the entire second base portion 17 and the ring side link portion 18, or may cover other portions. The protrusion 19P may be omitted, or one or more protrusions 19P may be provided. The cover 19 may be attached in a manner other than that described above, such as when the ring side link portion 18 has a protrusion and the cover 19 has a recess or hole, and the cover 19 is attached by engaging the protrusion with the recess or hole. The protrusion 19P may be separate and independent from the cover main body 19M.

[0020] Fig. 3A is a front view of the arm device 4. Fig. 3B is a side view of Fig. 3A. The arm device 4 has a device-side connection part 40, a device-side movable part 41, a device-side link part 42, and a plurality of (pair of) arm parts 44.

[0021] The device-side connection part 40 is made of metal and has a bifurcated part 50 and a bolt 52 as a connecting member.

[0022] The bifurcated portion 50 has a root portion 50U, a front tip portion 50F, and a rear tip portion 50B. The base portion 50U is cylindrical, and an imaginary central axis of the base portion 50U extends vertically. The front tip portion 50F and the rear tip portion 50B each extend upward from the upper end of the base portion 50U.

[0023] The bolts 52 are detachably attached to bolt holes formed in the tip portions 50F and 50B. The bolt 52 extends in the front-rear direction when installed and spans between the tip portions 50F and 50B when installed.

[0024] The device-side movable part 41 is rod-shaped. The device-side movable part 41 extends vertically and is provided so as to be able to slide vertically within the base part 50U. The lower portion of the device-side movable portion 41 can protrude downward from the lower end of the base portion 50U. A plate-like protruding portion 41P that protrudes downward from the upper side is provided in the center in the front-rear direction of the lower end of the device-side movable portion 41. The plate-like protruding portion 41P extends in all directions.

[0025] A ring attachment 2 can be attached to the device-side connection part 40 as a head part of the cable cutter 1. More specifically, the worker removes the bolt 52, aligns the ring-side connection hole JH of the ring attachment 2 with the bolt hole of the bolt 52, and then tightens the bolt 52, thereby connecting the ring attachment 2 to the arm device 4. At this time, the ring-side contact portion 30C of the link plate 30 of the ring attachment 2 comes into contact with the upper end of the device-side movable portion 41.

[0026] The device side link section 42 has a first bar 61, a second bar 62, a third bar 63, a fourth bar 64, a first joint 67, a second joint 68, a first shaft body 71, a second shaft body 72, a third shaft body 73, a fourth shaft body 74, and a fifth shaft body 75.

[0027] The first bar 61 is in the shape of a rod that extends vertically, and is disposed in front of the base portion 50U at the lower left. The second bar 62 is a rod-like bar that extends vertically, and is disposed in front of the base portion 50U at the lower right. The third bar 63 is a rod-like bar that extends vertically, and is disposed at the lower left and rear of the base portion 50U. The fourth bar 64 is a rod-like bar that extends vertically, and is disposed at the lower right and rear of the base portion 50U.

[0028] The first joint 67 is cylindrical with a lid, and is fixed to the upper end of the left arm 44. A first protrusion 67A is provided at the front of the upper end of the first joint 67, protruding diagonally to the upper right from the lower part. The second joint 68 is cylindrical with a lid, and is fixed to the upper end of the right arm part 44. A second protrusion 68A is provided at the rear of the upper end of the second joint 68, protruding diagonally upward and left from the lower part.

[0029] The first shaft 71 is cylindrical and extends in the front-to-rear direction, and passes through the upper end of the first bar 61, the left part of the lower end of the root portion 50U, and the upper end of the third bar 63. The upper end of the first bar 61, the left part of the lower end of the root portion 50U, and the upper end of the third bar 63 are rotatable around the first shaft 71. The second shaft 72 is cylindrical and extends in the front-to-rear direction, and passes through the lower end of the first bar 61, the lower part of the first joint 67, and the lower end of the third bar 63. The lower end of the first bar 61, the lower part of the first joint 67, and the lower end part of the third bar 63 are rotatable around the second shaft 72. The third shaft 73 is cylindrical and extends in the front-to-rear direction, and passes through the upper end of the second bar 62, the right part of the lower end of the root portion 50U, and the upper end of the fourth bar 64. The upper end of the second bar 62, the right part of the lower end of the root portion 50U, and the upper end of the fourth bar 64 are rotatable around the third shaft 73. The fourth shaft 74 is cylindrical and extends in the front-to-rear direction, and passes through the lower end of the second bar 62, the lower part of the second joint 68, and the lower end of the fourth bar 64. The lower end of the second bar 62, the lower part of the second joint 68, and the lower end of the fourth bar 64 are rotatable around the fourth shaft 74. The fifth shaft 75 is cylindrical and extends in the front-to-rear direction, and passes through the first protrusion 67A of the first joint 67, the plate-shaped protrusion 41P of the apparatus-side movable part 41, and the second protrusion 68A of the second joint 68. The first protrusion 67A of the first joint 67, the plate-shaped protrusion 41P of the apparatus-side movable part 41, and the second protrusion 68A of the second joint 68 are rotatable around the fifth shaft 75. The number, arrangement, size, etc. of the various members in the device-side link section 42 are not limited to those described above.

[0030] Each arm portion 44 is in the form of a rod that extends vertically. The vertical length of each arm portion 44 is, for example, approximately twice the combined vertical length of the device-side connection portion 40 and the device-side link portion 42 . The vertical length of the arm device 4 is, for example, 120 cm. The vertical length of the cable cutter 1, that is, the arm device 4 to which the ring attachment 2 is connected, is, for example, 126 cm. The dimensions of the arm portion 44 and the like are not limited to those described above.

[0031] 1A, 1B, 3A, and 3B, the fifth shaft 75 is positioned upward, and the device-side movable part 41 is positioned upward via the plate-shaped protruding part 41P. The device-side movable part 41 pushes the link plate 30 of the attached ring attachment 2 upward, bringing the first blade 12 and the second blade 14 into a cutting state.

[0032] From this state, when the operator opens each arm portion 44 outward in the left-right direction, the first protrusion 67A of the first joint 67 and the second protrusion 68A of the second joint 68 become movable downward. When the second protrusion 68A moves downward, the device-side movable portion 41 becomes movable downward via the fifth shaft 75 and the plate-shaped protrusion 41P. When the device-side movable portion 41 moves downward, the link plate 30 of the attached ring attachment 2 becomes movable downward, and the first blade 12 and the second blade 14 can return to their normal state (non-cutting state). When the operator attaches the cover 19, the protrusion 19P fixes the first blade 12 and the second blade 14 in their normal state. Note that, if an elastic body is provided to bias the link plate 30, as in the above-described modified example, the first blade 12 and the second blade 14 are returned to their normal state by elastic force. The first bar 61, the second bar 62, the third bar 63, and the fourth bar 64 connect the base portion 50U to the first joint 67 or the second joint 68 in a state in which the device side movable portion 41 can move up and down. Only one of the arm portions 44 may be capable of opening and closing (moving left and right) for vertical movement of the device-side movable portion 41. Also, an elastic body may be provided on the arm device 4 side that biases at least one of the arm portions 44 in directions away from each other.

[0033] An example of the operation of such a cable cutter 1 in cutting a cable in which a plurality of cables are densely packed in a location adjacent to the cutting target position will be described below. The worker applies the single ring attachment 2, which has been detached from the arm device 4, to the cable to be cut by passing the end of the cable through hole H. Then, the worker moves the ring attachment 2 along the cable to the position on the cable to be cut. During this movement, the first cutting edge 12B and the second cutting edge 14B do not appear inside hole H, thereby preventing damage to the cable to be cut. Furthermore, during this movement, the second base portion 17 and a portion of the ring side link portion 18 are covered by cover 19, preventing damage to the cable to be cut and adjacent cables. The worker removes the cover 19 from the ring attachment 2 placed at the target cutting position and then connects the arm device 4 to the ring attachment 2. The worker then closes the arms 44 (bringing them closer together in the left-right direction), thereby moving the first blade 12 and the second blade 14 inward in the left-right direction via the device-side movable part 41 and link plate 30. At the target cutting position, the target cable is cut by the first cutting edge 12B and the second cutting edge 14B. Because the length of each arm 44 is longer than the length of the device-side movable part 41, this cutting can be performed with less force based on the principle of leverage. Furthermore, because the first cutting edge 12B and the second cutting edge 14B are positioned inside the hole H of the ring attachment 2 during this cutting, the first cutting edge 12B and the second cutting edge 14B are prevented from accidentally cutting adjacent cables. If there are other cables to be cut, the worker similarly applies the ring attachment 2 to the cables to be cut, moves it to the position to be cut, connects the arm device 4, and cuts the cables to be cut.

[0034] The ring attachment 2 of the cable cutter 1 described above provides the following effects. That is, the ring attachment 2 includes a housing 10, a first blade 12 having a first cutting edge 12B, and a link plate 30 that changes position to transition the first blade 12 from a normal state to a cutting state. A hole H is formed by the housing 10 in the normal state. The first blade 12 is disposed inside the housing 10 with the first cutting edge 12B positioned outward from the outer periphery of the hole H in the normal state. Therefore, when the cable to be cut is inserted into the hole H and the ring attachment 2 is slid, the first cutting edge 12B of the first blade 12 is positioned outside the hole H and within the housing 10, thereby suppressing damage to the cable by the first cutting edge 12B. This makes it easier to move the ring attachment 2 to the position to be cut and to cut the cable at the position to be cut, providing a ring attachment 2 for a cable cutter 1 with greater work efficiency.

[0035] The ring attachment 2 also includes a housing 10 having a hole H, a first blade 12 having a first cutting edge 12B, a second blade 14 having a second cutting edge 14B, and a link plate 30 that changes position to transition the first blade 12 and the second blade 14 from a normal state to a cutting state. The first blade 12 is disposed inside the housing 10 with the first cutting edge 12B positioned outward from the outer periphery of the hole H in the normal state. The second blade 14 is disposed inside the housing 10 with the second cutting edge 14B positioned outward from the outer periphery of the hole H in the normal state. The first cutting edge 12B and the second cutting edge 14B are located inward from the outer periphery of the hole H in the cutting state. Therefore, when the cable to be cut is inserted into the hole H and the ring attachment 2 is slid, the first cutting edge 12B of the first blade 12 and the second cutting edge 14B of the second blade 14 are positioned outside the hole H inside the housing 10, thereby suppressing damage to the cable by the first cutting edge 12B and the second cutting edge 14B. Furthermore, at the position to be cut, the cable is cut more reliably by the first cutting edge 12B and the second cutting edge 14B that protrude into the hole H. Therefore, it is easy to move the ring attachment 2 to the position to be cut and to cut the cable at the position to be cut, and a ring attachment 2 for a cable cutter 1 with greater work efficiency is provided.

[0036] Furthermore, the ring attachment 2 is provided with a protrusion 19P that fixes the link plate 30 in a position that corresponds to the normal state of the first blade 12 and the second blade 14. This prevents the link plate 30 from moving during movement to the cutting position, causing the first cutting edge 12B of the first blade 12 and the second cutting edge 14B of the second blade 14 to enter the hole H, thereby providing the ring attachment 2 of the cable cutter 1 with improved work efficiency. Furthermore, the protrusions 19P are provided on the cover 19 that covers part or all of the link plate 30. Therefore, the cover 19 with the protrusions 19P for suppressing movement of the link plate 30 can also protect the link plate 30.

[0037] Furthermore, the above-described cable cutter 1 has the following advantages. That is, the cable cutter 1 includes a ring attachment 2 and an arm device 4. The arm device 4 includes an arm portion 44, a device-side movable portion 41 that moves in accordance with the movement of the arm portion 44, and a device-side connection portion 40 that can be connected to the ring attachment 2 (ring-side connection hole JH). The device-side movable portion 41 moves to change the position of the link plate 30 in the ring attachment 2 that is connected at the device-side connection portion 40. Therefore, the worker simply connects the arm device 4 at the device side connection part 40 to the ring side connection hole JH on the ring attachment 2, which has been placed at the position to be cut and has the cover 19 removed, and moves the arm part 44, thereby more reliably cutting the cable to be cut while preventing cutting of cables other than the cable to be cut. Furthermore, the operator can cut the cable more quickly and neatly by using the principle of leverage with the arm portion 44. Therefore, the cable cutter 1 is provided with improved cutting efficiency.

[0038] [Second form] 4A is a front view of a cable cutter 101 according to the second embodiment, and FIG. In the cable cutter 101 according to the second embodiment, the ring attachment 2 is the same as in the first embodiment. The same members and parts as in the first embodiment, including the ring attachment 2, are denoted by the same reference numerals in the second embodiment as in the first embodiment. The cable cutter 101 of the second embodiment has appropriate modifications, similar to the first embodiment.

[0039] The cable cutter 101 of the second type has a ring attachment 2 and an electric device 104. The electric device 104 includes a battery 110 and an electric device body 112 . It should be noted that only the electric device body 112 may be considered as the electric device.

[0040] The battery 110 is a power source capable of supplying electric power, and is, for example, a lithium ion battery. The battery 110 has a battery button 110B.

[0041] The electric device main body 112 has a device-side connection part 40 , a device-side movable part 120 , a battery mounting part 121 , a motor 122 , a switch 124 , and a power transmission part 126 .

[0042] The device-side connection part 40 is disposed at the upper end of the electric device body 112 . The device-side movable part 120 is in the shape of a rod that extends vertically, and is provided within the base part 50U of the device-side connection part 40 so as to be able to slide vertically.

[0043] The battery 110 is attached to the battery attachment section 121. The battery 110 is attached by sliding it from the left side of the battery attachment section 121 to the right side. The battery 110 attached to the battery attachment section 121 can supply power to the motor 122 . The battery 110 attached to the battery attachment section 121 can be removed by sliding the battery 110 to the left while pressing the battery button 110B. The battery 110 may be attached to the battery mounting portion 121 in a manner other than sliding, and may be placed in, for example, a battery mounting portion 121 formed in a box shape with or without a lid. The battery button 110B may be lever-shaped or may be omitted. Furthermore, multiple batteries 110 may be attached to the battery mounting portion 121. In addition, instead of or together with the battery mounting portion 121, a power line and plug connectable to a commercial power source may be provided.

[0044] The motor 122 has a stator and a rotor, and applies a rotational driving force to the power transmission unit 126 by rotating the rotor relative to the stator using the power of the battery 110 . The motor 122 may be, for example, an electric motor with brushes or a brushless motor.

[0045] The switch 124 is provided between the battery mounting section 121 and the motor 122 in the electric circuit. The switch 124 is of trigger type and increases (switches on) the amount of power supplied from the battery 110 to the motor 122 depending on the amount of depression (above play). The switch 124 cuts off the supply of power to the motor 122 (switches off) when the amount of depression is zero (greater than or equal to the play). The greater the depression of the switch 124, the greater the rotational driving force of the motor 122, and the faster the power transmission part 126 moves. The switch 124 may be of a type other than a trigger type, such as a button type or a lever lock type. The switch 124 may also be of a type that switches between two states: an ON state in which a predetermined power supply is performed, and an OFF state in which the power is cut off.

[0046] The power transmission unit 126 converts the rotational driving force from the motor 122 into a reciprocating motion and transmits it to the device-side movable unit 120 . The power transmission unit 126 moves the device-side movable unit 120 up and down by the rotational driving force from the motor 122 . The power transmission unit 126 is, for example, a crank mechanism. The power transmission unit 126 may include a gear box having one or more gears.

[0047] The vertical length of the electric device 104 is, for example, 38 cm. The maximum depth of the electric device 104 in the front-to-rear direction is, for example, 8.5 cm from the front end of the bolt 52 to the rear end of the battery. The maximum width of the electric device 104 in the left-right direction is, for example, 10 cm from the front end of the battery 110 to the rear end of the battery 110. The length of the cable cutter 101 in the vertical direction is, for example, 45 cm. The dimensions of the electric device 104 and the like are not limited to those described above.

[0048] An example of the operation of such a cable cutter 101 in cutting a cable in which a plurality of cables are densely packed in a location adjacent to the cutting target position will be described below. As in the first embodiment, the worker passes the end of the cable to be cut through the hole H, and moves the ring attachment 2 along the cable to the position on the cable to be cut. The worker also removes the cover 19 from the ring attachment 2 placed at the cutting position, and then connects the electric device 104. As in the first embodiment, the worker can connect the ring attachment 2 to the electric device 104 via the bolt 52 and the ring-side connection hole JH. When the ring attachment 2 is connected to the electric device 104, the ring-side contact portion 30C of the link plate 30 comes into contact with the upper end of the device-side movable portion 120. Then, the operator presses the switch 124 (beyond the play), thereby moving the device-side movable part 120 upward via the motor 122 and the power transmission part 126, and moving the link plate 30 of the ring attachment 2 upward. This movement of the link plate 30 causes the first blade 12 and the second blade 14 to move inward in the left-right direction, and at the cutting position, the cable to be cut is cut by the first cutting edge 12B and the second cutting edge 14B. This cutting can be performed electrically by the motor 122. Furthermore, during this cutting, the first cutting edge 12B and the second cutting edge 14B are positioned inside the ring attachment 2 hole H, thereby preventing the accidental cutting of adjacent cables. If there are other cables to be cut, the worker similarly applies the ring attachment 2 to the cables to be cut, moves it to the position to be cut, connects the electric device 104, and cuts the cables to be cut.

[0049] The above-described cable cutter 101 provides the following advantages. That is, the cable cutter 101 includes a ring attachment 2 and an electric device 104. The electric device 104 includes a device-side movable part 120 that moves electrically, and a device-side connection part 40 that can be connected to the ring attachment 2 (ring-side connection hole JH). The device-side movable part 41 moves to change the position of the link plate 30 in the ring attachment 2 that is connected to the device-side connection part 40. Therefore, the worker simply connects the electric device 104 to the device side connection part 40 of the ring attachment 2 (ring side connection hole JH) that has been placed at the position to be cut and has removed the cover 19, and turns on the switch 124, thereby more reliably cutting the cable to be cut while preventing cutting of cables other than the cable to be cut. Furthermore, the operator can cut the cable more quickly and neatly by using the electric motor 122. Therefore, the cable cutter 1 is provided with superior cutting efficiency.

[0050] [Third form] Fig. 6A is a front view of a cable cutter 201 according to a third embodiment. Fig. 6B is a side view of the cable cutter 201. Fig. 6C is an enlarged view of the upper part in the normal state of Fig. 6A. Fig. 6D is a front view of the ring attachment 202 in Fig. 6C. The cable cutter 201 of the third embodiment has a ring attachment 202 and an arm device 204. The cable cutter 201 of the third embodiment may have appropriate modifications, similar to the first and second embodiments.

[0051] The ring attachment 202 is ring-shaped, and more specifically, is ring-shaped and cannot be opened or closed (unless it is broken). Note that the ring attachment 202 may be openable or closable (without being broken). The ring attachment 202 has a housing 210, a first blade 212, a movable cover portion 214 as a ring-side movable portion, and an elastic body 216 as a locking portion.

[0052] The housing 210 is made of plastic and includes a first housing 220 and a second housing 222 . The first housing 220 is "U" shaped when viewed from the front. The second housing 222 is "U" shaped when viewed from the rear. The first housing 220 and the second housing 222 are joined together with a plurality of screws 230 extending in the front-to-rear direction, with the first housing 220 positioned in front of the second housing 222. The first housing 220 and the second housing 222 have left and right protrusions C that protrude upward relative to their lower portions. At least one of the first housing 220 and the second housing 222 has a hook portion 232 provided at the center of each of the left and right sides, which extends outward in the left-right direction and further extends downward at its outer end.

[0053] The first blade 212 is made of metal and has a plate shape. The first blade 212 has a first cutting edge 212B at the lower side. The first cutting edge 212B has an upwardly convex arc shape (semicircular, "∩" shape). The first blade 212 is placed between the upper ends of the protrusions C of the housing 210. The first blade 212 is replaceably attached to the housing 210 (the upper ends of the protrusions C) by a pin 234 extending back and forth.

[0054] The movable cover part 214 is made of plastic (translucent acrylic) and has a box shape that is open downward. A lower side part 214U of the movable cover part 214 is formed in an arc shape (semicircular shape) that is convex upward. The movable cover part 214 is provided so as to be able to slide up and down between the left and right protrusions C of the housing 210. In a normal state (uncut state), the movable cover part 214 is positioned downward, and a circular hole H2 is formed between the lower side part 214U of the movable cover part 214 and the lower end part of each protrusion C. In this example, the elastic body 216 is a rubber belt that extends laterally. The left end of the elastic body 216 is hooked onto the left hook portion 232. The right end of the elastic body 216 is hooked onto the right hook portion 232. The center portion of the elastic body 216 in the left-right direction is disposed along the upper surface of the movable cover portion 214 and is in contact with said upper surface. The elastic body 216 biases the movable cover portion 214 downward. In a normal state, the first cutting edge 212B is disposed above the lower side 214U of the movable cover part 214, is housed in the movable cover part 214, and is positioned radially outward from the outer periphery of the hole H2. The movable cover portion 214 may slide left and right instead of up and down, and may rotate instead of or in addition to the sliding movement.

[0055] The width of the ring attachment 202 in the left-right direction is, for example, 5 cm. The vertical length of the ring attachment 202 in its normal state is, for example, 7 cm. The depth of the ring attachment 202 in the front-to-rear direction is, for example, 1 cm. The ring attachment 202 is smaller than the ring attachment 2, for example. The dimensions of the ring attachment 202 are not limited to those described above. The ring attachment 202 may be approximately the same size as the ring attachment 2, or may be larger than the ring attachment 2.

[0056] The arm device 204 has a device-side connection part 240, a second blade 241 as a device-side movable part, a device-side link part 242, and a plurality of (pair of) arm parts 244.

[0057] The device-side connection part 240 is made of metal and has a device-side connection part base 240B and a pair of left and right locking parts 240J as device-side connection parts. The device-side connection portion base 240B is a square tube with open top and bottom. The left locking portion 240J is provided on the upper left part of the device-side connection part base 240B. The left locking portion 240J protrudes upward from the upper left part of the device-side connection part base 240B. The right locking portion 240J is provided on the upper right part of the device-side connection part base 240B. The right locking portion 240J protrudes upward from the upper right part of the device-side connection part base 240B. The left locking portion 240J can be locked to the left lower portion of the ring attachment 202. The right locking portion 240J can be locked to the right lower portion of the ring attachment 202. The ring attachment 202 is connected by locking each locking portion 240J to the ring attachment 202. In addition, the ring attachment 202 can be removed from the device-side connection portion 240 by releasing the locking of each locking portion 240J to the ring attachment 202.

[0058] The second blade 241 is made of metal and has a plate shape that extends in all directions. The second blade 241 has a second cutting edge 241B on the upper side thereof. The second cutting edge 241B has an arc shape (semicircular, U-shaped) that is convex downward. The second blade 241 extends vertically and is provided so as to be slidable up and down within the device-side connection base 240B. The upper end of the second blade 241 projects upward from the upper end of the device-side connection base 240B. The lower end of the second blade 241 projects downward from the lower end of the device-side connection base 240B. In a normal state, the second cutting edge 241B is positioned below the upper edge of the part between the left and right protrusions C of the housing 210, is housed in the housing 210, and is located radially outward from the outer periphery of the hole H2.

[0059] The device side link portion 242 is made of metal and has a first joint 261, a second joint 262, a first bar 263, a second bar 264, a first shaft body 271, a second shaft body 272, a third shaft body 273, a fourth shaft body 274, and a fifth shaft body 275.

[0060] The first joint 261 is a pair of plates aligned in front and behind. Each plate extends in all directions and has a right-angled triangular shape when viewed from the front. The second joint 262 is a pair of plates aligned in front and behind. Each plate extends in all directions and has a right-angled triangular shape when viewed from the front. The second joint 262 is disposed symmetrically to the first joint 261. One corner of the second joint 262 overlaps with one corner of the first joint 261 and the lower end of the second blade 241. The lower end of the second blade 241 is disposed between (the front plate of) the second joint 262 and (the rear plate of) the first joint 261.

[0061] The first bar 263 is a rod-like member that extends vertically, and is disposed from within the lower left portion of the device-side connection portion base 240B to within the upper left portion of the first joint 261. The second bar 264 is a rod-like member that extends vertically, and is disposed from within the lower right portion of the apparatus-side connection portion base 240B to within the upper right portion of the second joint 262.

[0062] The first shaft 271 is cylindrical and extends forward and backward, passing through the lower left part of the device-side connection part base 240B and the upper end part of the first bar 263. The lower left part of the device-side connection part base 240B and the upper end part of the first bar 263 are rotatable around the first shaft 271. The second shaft 272 is cylindrical and extends forward and backward, passing through the lower right part of the device-side connection part base 240B and the upper end part of the second bar 264. The lower right part of the device-side connection part base 240B and the upper end part of the second bar 264 are rotatable around the first shaft 71. The third shaft 273 is cylindrical and extends in the front-to-rear direction, passing through the lower end of the first bar 263 and the upper left part of the first joint 261. The lower end of the first bar 263 and the upper left part of the first joint 261 are rotatable around the third shaft 273. The fourth shaft 274 is cylindrical and extends in the front-to-rear direction, passing through the lower end of the second bar 264 and the upper right portion of the second joint 262. The lower end of the second bar 264 and the upper right portion of the second joint 262 are rotatable around the fourth shaft 274. The fifth shaft 275 has a cylindrical shape that extends in the front-to-rear direction, and passes through a corner of the first joint 261, a lower end of the second blade 241, and a corner of the second joint 262, which are all overlapping each other. The number, arrangement, size, etc. of the various members in the device-side link section 242 are not limited to those described above. The device-side connection section base 240B may also be treated as a component of the device-side link section 242.

[0063] Each arm portion 244 is in the shape of a rod that extends vertically. A left portion of the first joint 261 is fixed (screwed) to the upper end of the left arm portion 244. A right portion of the second joint 262 is fixed (screwed) to the upper end of the right arm portion 244. The vertical length of each arm portion 244 is, for example, approximately twice the combined vertical length of the device-side connection portion 240 and the device-side link portion 242 . The vertical length of the arm device 204 is, for example, 21 cm. The vertical length of the cable cutter 201, that is, the arm device 204 to which the normal ring attachment 202 is connected, is, for example, 30 cm. The dimensions of the arm portion 244 and the like are not limited to those described above.

[0064] 6C, each arm 244 opens outward to the left and right, the first bar 263 and the second bar 264 are aligned vertically, the fifth shaft 75 is positioned below, and the second blade 241 is positioned below. The second cutting edge 241B is located within the housing 210 of the attached ring attachment 202 and is positioned below the hole H2 (normal, non-cutting state).

[0065] From this state, as shown in FIGS. 6A and 6B , when the operator closes the arms 244 inward in the left-right direction, the lower ends of the first bar 263 and the second bar 264 open outward in the left-right direction, the fifth shaft 75 is positioned upward, and the second blade 241 moves upward. The upper left and upper right ends of the second blade 241 contact the lower end of the movable cover 214 of the housing 210 and push the movable cover 214 upward against the elastic force of the elastic body 216. As the movable cover 214 moves in this manner, the first cutting edge 212B is gradually exposed from the lower end. Furthermore, the second cutting edge 241B approaches and gradually overlaps with the exposed first cutting edge 212B, and the first blade 212 and the second blade 241 enter a cutting state. The operator can return the first blade 212 and the second blade 241 to their normal states by opening each arm portion 244 outward in the left-right direction from the cutting state. The elastic force of the elastic body that biases the movable cover portion 214 acts in a manner that returns the first blade 212 and the second blade 241 to their normal states. In other words, the ring attachment 202 includes an elastic body 216 that, by biasing action, fixes the movable cover portion 214, which serves as the ring-side movable portion, downward, which is a position that corresponds to the normal state of the first blade 212. The first bar 263 and the second bar 264 connect the device side connection portion base 240B to the first joint 261 or the second joint 262 in a state in which the second blade 241 can move up and down. Only one of the arm portions 244 may be capable of opening and closing (moving left and right) for vertical movement of the second blade 241. Also, an elastic body may be provided on the arm device 204 side that biases at least one of the arm portions 244 in directions away from each other. The second blade 241 may be moved up and down via a separately provided device-side movable portion.

[0066] An example of the operation of such a cable cutter 201 in cutting a cable in which a plurality of cables are densely packed in a location adjacent to the cutting target position will be described below. The worker applies the single ring attachment 202, which has been detached from the arm device 204, to the cable to be cut by passing the end of the cable through hole H2. Then, the worker moves the ring attachment 202 along the cable to the position on the cable to be cut. During this movement, the elastic body 216 also biases the movable cover part 214 downward, preventing the first cutting edge 212B from appearing within hole H2, thereby preventing damage to the cable to be cut. The worker connects the arm device 204 to the ring attachment 202 placed at the position to be cut. Then, by closing each arm portion 244, the worker moves the second blade 241 of the arm device 204 in a direction (upward) approaching the first blade 212 of the ring attachment 202, moves the movable cover portion 214 upward to expose the first cutting edge 212B, and cuts the cable to be cut at the position to be cut with the first cutting edge 212B and the second cutting edge 241B. During this cutting, the hole H2 extends upward due to the movement of the movable cover portion 214, and within the extended hole H2, the first cutting edge 212B is exposed at the top and the second blade 241 enters from below. This cutting can be performed with less force based on the principle of leverage because the length of each arm 244 is longer than the distance from the third shaft 273 or the fourth shaft 274 to the fifth shaft 275. Furthermore, during this cutting, the first cutting edge 212B and the second cutting edge 241B are positioned inside the area surrounded by the housing 210 (the first housing 220, the second housing 222, and the movable cover 214) of the ring attachment 202, thereby preventing the accidental cutting of adjacent cables. Furthermore, because the ring attachment 202 has a single first blade 212 that does not move by itself, the cable cutter 201 can be more easily miniaturized and is easier to handle, for example, it can be more easily carried on the operator's belt pouch. If there are other cables to be cut, the worker similarly applies the ring attachment 202 to the cables to be cut, moves them to the position to be cut, connects the arm device 204, and cuts the cables to be cut.

[0067] The ring attachment 202 of the cable cutter 201 described above has the following advantages. That is, the ring attachment 202 includes a housing 210, a first blade 212 having a first cutting edge 212B, and a movable cover part 214 that changes its position to transition the first blade 212 from a normal state to a cutting state. A hole H2 is formed by the housing 210 and the movable cover part 214 in the normal state. In the normal state, the first blade 212 is disposed inside the movable cover part 214 with the first cutting edge 212B positioned outward from the outer periphery of the hole H2. Therefore, when the cable to be cut is inserted into hole H2 and ring attachment 202 is slid, first cutting edge 212B of first blade 212 is positioned outside hole H2 and within movable cover portion 214, thereby suppressing damage to the cable by first cutting edge 212B. Therefore, it is easy to move ring attachment 202 to the position to be cut and to cut the cable at the position to be cut, and ring attachment 202 of cable cutter 201 with better work efficiency is provided.

[0068] The ring attachment 202 also includes an elastic body 216 that fixes the movable cover portion 214 in a position corresponding to the normal state of the first blade 212 . Therefore, the movable cover part 214 is prevented from moving during movement to the cutting position, and the first cutting edge 212B of the first blade 212 is prevented from entering the hole H2, thereby providing the ring attachment 202 of the cable cutter 201 with better work efficiency.

[0069] In addition, the above-described cable cutter 201 has the following advantages. That is, the cable cutter 201 includes a ring attachment 202 and an arm device 204. The arm device 204 includes an arm portion 244, a second blade 241 that moves in response to movement of the arm portion 244, and a locking portion 240J that can be connected to the ring attachment 202, and the movement of the second blade 241 changes the position of the movable cover portion 214 of the ring attachment 202 that is connected at the locking portion 240J. Therefore, the worker can simply connect the arm device 204 to the ring attachment 202 placed at the position to be cut at the locking portion 240J and close the arm portion 244, thereby more reliably cutting the cable to be cut while preventing cutting of cables other than the cable to be cut. Furthermore, the operator can cut the cable more quickly and neatly by using the principle of leverage with the arm portion 244. Therefore, the cable cutter 201 is provided with improved cutting efficiency. [Explanation of symbols]

[0070] 1,101,201·· Cable cutter, 2,202·· Ring attachment, 4,204·· Arm device, 10,210·· Housing, 12,212·· First blade (blade), 12B,212B·· First cutting edge (blade edge), 14,241·· Second blade, 14B,241B·· Second cutting edge, 19·· Cover, 19P·· Protrusion (locking portion), 30·· Link plate (ring side movable portion), 40·· Device side connection portion, 41,120·· Device side movable portion, 44,244·· Arm portion, 104·· Electric device, 214·· Movable cover portion (ring side movable portion), 216·· Elastic body (locking portion), H,H2·· Hole.

Claims

1. Housing and a blade having a cutting edge; a ring-side movable part that transitions the blade from a normal state to a cutting state by changing at least one of its position and posture; It is equipped with a hole is formed by at least one of the housing and the ring-side movable part in the normal state, The blade is disposed inside at least one of the housing and the ring-side movable part with the cutting edge positioned outward from the outer periphery of the hole in the normal state. A ring attachment for a cable cutter.

2. A locking part is provided to fix the ring-side movable part in at least one of a position and a posture corresponding to a normal state of the blade.

2. The cable cutter ring attachment according to claim 1.

3. The locking portion is provided on a cover that covers a part or all of the ring-side movable portion.

3. The cable cutter ring attachment according to claim 2.

4. a housing having a hole; a first blade having a first cutting edge; a second blade having a second cutting edge; a ring-side movable unit that transitions at least one of the first blade and the second blade from a normal state to a cutting state by changing at least one of its position and posture; It is equipped with the first blade is disposed inside the housing with the first cutting edge positioned outward from the outer periphery of the hole in the normal state; the second blade is disposed inside the housing with the second cutting edge positioned outward from the outer periphery of the hole in the normal state; The first cutting edge and the second cutting edge are positioned inward from the outer periphery of the hole in the cutting state. A ring attachment for a cable cutter.

5. A locking part is provided to fix the ring-side movable part in at least one of a position and a posture corresponding to a normal state of at least one of the first blade and the second blade.

5. The cable cutter ring attachment according to claim 4.

6. The locking portion is provided on a cover that covers a part or all of the ring-side movable portion.

6. A cable cutter ring attachment according to claim 5.

7. A cable cutter ring attachment according to any one of claims 1 to 6; an arm device; It is equipped with The arm device An arm portion; a device-side movable section that moves in response to movement of the arm section; a device-side connection portion connectable to the ring attachment; It is equipped with The device-side movable part changes at least one of the position and the posture of the ring-side movable part in the ring attachment connected to the device-side connecting part by movement. A cable cutter characterized by:

8. A cable cutter ring attachment according to any one of claims 1 to 6; Electrical equipment; It is equipped with The electrically powered device is a device-side movable part that moves electrically; a device-side connection portion connectable to the ring attachment; It is equipped with The device-side movable part changes at least one of the position and the posture of the ring-side movable part in the ring attachment connected to the device-side connecting part by movement. A cable cutter characterized by:

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