JP2007228740A - Coated wire stripper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coated wire stripper that reduces the operation force of an operation lever required when cutting and peeling off insulation coating. <P>SOLUTION: An auxiliary drive means is provided on a connecting mechanism 4 that links the operation lever 3, which swings up and down centering a shaft 10 within the range of an operation angle θ between the start point S and the end point E, to a grip portion 5 that grips the coated wire W via a conversion mechanism 20 and cuts and peels off the insulation coatings C1, C2 of the wire. The auxiliary drive means changes a distance between the shaft 10 and a shaft 15 according to the angle at which the operation lever 3 is operated. By transmitting the force strongly in a process in which the grip portion 5 cuts the insulation coatings C1, C2 of the wire W, and by giving priority to displacement in a process in which the cut coatings are removed, the operation force of the operation lever 3 is configured to work effectively. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a stripper for a covered electric wire.

FIG. 13 is a perspective view showing a stripper of a conventional covered electric wire. This conventional example is the same type as that disclosed in, for example, Japanese Patent Publication No. 61-22528. The stripper of the covered electric wire has a pair of grips 51 and 52, and an end of the grip 52 is connected to an intermediate portion of the grip 51 by a shaft 57, and is held by one of the grips 51 to hold the wire. A linkage connected to one end of a mechanism 53 and a conversion mechanism 56 provided with a cutting blade 55 for cutting the insulation coating of the electric wire and pulling it out to the base, and connected to an intermediate portion of the other handle 52 by a shaft 59 The link 58 is connected, the opening degree of both the handles 51 and 52 is reduced, and the covered electric wires are peeled off.
Japanese Examined Patent Publication No. 61-22528

When stripping the insulation of the coated wire with the above conventional coated wire stripper, first, a large force is required to cut the insulation coating, and then a large amount of displacement is required to remove the insulation coating after being cut. The amount is required. In such a tool, since the handle is operated with one hand, the operation force and the operation amount are limited. Therefore, the distance between the shaft 57 and the shaft 59 is not changed in the conventional stripped wire stripper. It has been difficult to satisfy each by using a large force when cutting the coating and a large amount of displacement when extracting the insulating coating after cutting.
Therefore, the use of a conventional stripped wire stripper requires a large gripping force. In particular, a greater gripping force is required to remove the insulation coating of the insulated wire that has been hardened due to the age, the hardening of the insulation coating due to the cold environment, and the environmental measures of the insulation coating material. The insulation coating could not be cut.

To solve the above problem, it is possible to obtain a larger force and a larger amount of displacement by increasing the length of the handle or increasing the amount of operation displacement of the handle. The basic functions required for this tool, such as one-handed operation and workability in a narrow space, are lost.

In order to cut the insulation coating of the covered electric wire, it is necessary to apply a force of 100 N or more to the cutting blade, depending on the size. To remove the cut insulation coating, the force required for cutting is compared with the force required for cutting. This is possible with as little as 20 to 30 percent of force.

The present invention has been made in view of such problems, and the problem is that when the insulation coating to be peeled is cut, the gripping force applied to the handle is transmitted to the cutting blade more, and the insulation coating is applied with a small gripping force. In the process of cutting the insulation coating piece after cutting, the displacement amount of the handle is transferred to the displacement amount that the cutting blade moves to the separating side, and the insulation coating piece is removed. In other words, a series of operations for peeling off the insulating coating can be performed with less gripping force.

The present invention employs the following technical means in order to solve the above problems. That is, the feature of the present invention is that the operation of the operation lever and the connecting link connected to the lever clamps the covered electric wire and cuts the insulating coating of the electric wire, and the lever operation is the operation of the holding unit. In the stripper provided with a conversion mechanism for converting, the connection link is configured by connecting a plurality of links by a shaft, one end is connected by a shaft to an intermediate position of the operation lever, and one of the links is the conversion When the shaft is coupled to the mechanism and the operation of the operation lever is transmitted to the conversion mechanism, the intermediate shaft portion of the connection link is configured to have a function capable of moving depending on the position where the operation lever is operated. In the point.

According to this configuration, one end of the connecting link is coupled to the shaft at a position closer to the operation center axis of the operation lever, the operation force of the operation lever is amplified and transmitted to the conversion mechanism, and the holding portion has a strong force. The insulation coating of the covered electric wire can be cut with. After cutting the insulation coating, the operation amount of the operation lever can be amplified and transmitted to the conversion mechanism by moving the intermediate shaft portion of the connecting link in a direction away from the operation center axis of the operation lever. The amount of displacement for removing the insulating coating is increased. Therefore, even if the operation force of the operation lever is constant, it can be found that a position that exerts a large force and a position that exerts a large amount of movement can be obtained individually, and the operation force of the operation lever can be significantly reduced. did.

In the present invention, a roller for reducing friction is attached to the intermediate shaft portion of the connection link and the connection shaft portion of the connection link and the conversion mechanism end, and the operation force of the operation lever is efficiently applied to each portion. It is configured to work.

In the present invention, the main body wall surface of the tool functions as a cam as a means for moving the intermediate shaft portion of the connection link away from the operation center axis of the operation lever, thereby simplifying the structure.

According to the present invention, since the operating force of the operating lever can be appropriately and efficiently distributed to the insulation coating cutting of the covered electric wire and the extraction of the cut insulating coating, the operating force of the operating lever can be significantly reduced.

Embodiments of the present invention will be described below with reference to the drawings.

The stripper 1 is suitable for peeling off the insulation coatings C1 and C2 of the covered electric wire W as shown in FIG. This covered electric wire W is constituted by a plurality of copper wires S respectively covered by the first insulating coating C1 and further covered by the second insulating coating C2 to form a single electric wire. As shown in FIG. 1, the stripper is a conversion mechanism that operates by operation of an operation lever via a main body 2, an operation lever 3 pivotally attached to the main body 2, and a connecting link mechanism 4 that transmits the movement of the operation lever 3. 20 and the peeling part 5 for peeling the coating | cover C1, C2 of the electric wire W by the operation | movement of the conversion mechanism 20 are comprised.

The operation lever 3 is attached to a shaft 10 provided in the main body 2, and is grasped by hand together with a handle 26 provided in the main body 2, and an operation angle θ between the start point S and the end point E about the shaft 10. It can be reciprocated in the range. The operation lever 3 is biased by the spring 11 in the opening direction with respect to the handle 26. The connection link mechanism 4 includes a first link 13, a shaft 14, a roller 15, a spring 16, a second link 17, a shaft 18, and a roller 19. The first link 13 is attached to a shaft 12 provided on the operation lever 3 and is swingable about the shaft 12, but one end 13 a is always in the direction of the wall position 25 of the operation lever by a spring 38. It is energized. One end of the second link 17 is attached to the shaft 14 provided on the first link together with the roller 15, and is provided to be swingable about the shaft 14. The second link 17 is biased counterclockwise about the shaft 14 by the spring 16 with respect to the first link 13. Further, the other end side 17 b of the second link 17 is connected to the first arm 6, the second arm 7, and the third arm 8 of the conversion mechanism 20 together with the roller 19 by the shaft 18.

As shown in FIG. 3, the first arm 6 has a connecting hole 33 through which the shaft 9 is inserted in the middle in the longitudinal direction, and is provided so as to be swingable around the shaft 9. A long hole 32 extending in the longitudinal direction is formed at the rear end of the first arm 6. The long hole 32 is a guide hole of the roller 19 supported by the shaft 18 on the other end side 17 b of the second link 17, and the roller 19 is movable along the long hole 32. As shown in FIG. 5, the third arm 8 has a long hole 35 extending in the middle in the longitudinal direction. A shaft 9 is inserted through the elongated hole, and the third arm 8 is movable in the front-rear direction with respect to the shaft 9. Further, an arc-shaped long hole 30 extending substantially in the vertical direction is formed at the rear end portion of the third arm 8. A shaft 18 is inserted into the long hole 30, and the shaft 18 is movable in the vertical direction along the long hole 30. As shown in FIG. 4, the second arm 7 has a long hole 31 extending in the middle in the longitudinal direction. A shaft 9 is inserted into the elongated hole, and the second arm 7 is movable in the front-rear direction with respect to the shaft 9. A connecting hole 34 is formed at the rear end of the second arm 7. The shaft 18 is inserted into the connection hole 34, and the second arm 7 is held so as to be rotatable with respect to the shaft 18.

The peeling portion 5 is composed of a distal end portion 2a of the main body 2 and distal end portions 6a, 7a, 8a of the first arm 6, the second arm 7 and the third arm 8, respectively. A first cutting blade 21 that is a lower blade is provided at the distal end portion 2 a of the main body 2. The lower surface of the distal end portion 6 a of the first arm 6 is a holding portion 36 for the covered electric wire W. The leading end portion 8a of the third arm is provided with a covered lead portion 37 of the covered electric wire W. A second cutting blade 22, which is an upper blade, is attached to the distal end portion 7 a of the second arm 7. Further, a guide portion 23 for guiding the second cutting blade 22 to the position of the first cutting blade 21 is provided at the distal end portion 2 a of the main body 2.

Since the 1st cutting blade 21 is provided in the main body 2, it is a fixed blade in position. As shown in FIG. 6, the cutting edge of the first cutting blade 21 is aligned with the first insulating coating C1 so that the covered wire W can be cut into both the first insulating coating C1 and the second insulating coating C2. And a shape suitable for the second insulating coating C2. The pressing portion 36 at the tip of the first arm 6 holds the covered electric wire W from above and holds the base side where the covering of the covered electric wire is not peeled off. The first insulating coating C1 and the second insulating coating C2 of the covered electric wire W are provided. It corresponds to the difference in size.

Since the second cutting blade 22 is provided on the second arm 7 constituting the conversion mechanism 20, the second cutting blade 22 is a moving blade that moves in accordance with the operation of the operation lever 3. The 2nd cutting blade 22 is attached to the front-end | tip part 7a of the 2nd arm 7 so that the 1st cutting blade 21 facing upward and the blade edge may face each other. Similarly to the first cutting blade 21, the cutting edge of the second cutting blade matches the first insulating coating C1 so that the coated wire W can be cut into both the first insulating coating C1 and the second insulating coating C2. The shape and the shape suitable for the second insulating coating C2. The covering lead-out portion 37 protruding from the distal end portion 8a of the third arm 8 pulls out the coverings C1 and C2 cut by the first cutting blade and the second cutting blade, and moves rearward together with the second cutting blade 22. It is configured.

In order to peel off the insulation coatings C1 and C2 of the coated electric wire W by the stripper 1 configured as described above, the coated electric wire is placed on the first cutting blade 21 and the operation lever 3 is closed in the state shown in FIG. Then, the operation lever 3 rotates and moves the connecting link mechanism 4 upward. At this time, the rear ends of the first arm 6 and the second arm 7 connected to the connection link mechanism 4 by the shaft 18 and the roller 19 are arc-shaped elongated holes 30 provided at the rear of the third arm 9 and extending in a substantially vertical direction. Along the axis 9 and moving upward about the axis 9. At this time, the first arm 6 and the second arm 7 rotate about the axis, and the pressing portion 36 at the tip of the first arm 6 presses the side of the covered wire W, and the second arm 7 tip 7a The two cutting blades 22 reach the coated surface of the coated electric wire W. This state is shown in FIG.

In the state of FIG. 7, the operating force of the operating lever 3 is transmitted to the pressing portion 36 at the tip of the first arm 6 and the second cutting blade at the tip 7a of the second arm 7, and the pressing portion 36 at the tip of the first arm 6 is The second cutting blade 22 at the distal end 7a of the second arm 7 is pressed together with the first cutting blade 21 into the covering of the covered electric wire while pressing the base side of the covered electric wire W. At this time, the center of the shaft 14 and the roller 15 of the connection link mechanism 4 rotates with a radius r0 from the center of the shaft 10 of the main body 2 to which the operation lever 3 is attached, and the force point F0 to the operation lever 3 is the same axis. It rotates with a radius R0 from the center of 10. Further, the center of the shaft 14 and the roller 15 of the connection link mechanism 4 has a smaller radius r0 from the center of the shaft 10 of the main body 2 to which the operation lever 3 is attached as compared with the conventional stripper. Therefore, the operating force N0 applied to the force point F0 of the operating lever 3 increases to the connecting link mechanism 4 at a ratio of R0 / r0, and is transmitted to the conversion mechanism 20 as the transmitted force N1, so that the first 2 The operating force of the operating lever 3 required for cutting the cutting blade into the insulation coatings C1 and C2 of the coated electric wire W is remarkably reduced.

In the state of FIG. 7, the operating force of the operating lever 3 is transmitted to the pressing portion 36 at the tip of the first arm 6 and the second cutting blade at the tip 7a of the second arm 7, and the second cutting of the tip 7a of the second arm 7 is performed. When the blade 22 and the first cutting blade 21 cut into the sheath of the covered electric wire, the shaft 14 and the roller 15 of the connection link mechanism 4 are arcuately formed in the substantially vertical direction provided behind the third arm 9. As shown in FIG. 8, the force N1 located at the upper end of the long hole 30 and transmitted from the connection link mechanism 4 to the conversion mechanism 20 is applied to the pressing portion 36 at the distal end of the first arm 6 and the distal end 7a of the second arm 7. The holding portion 36 at the tip of the first arm 6 presses the side of the covered wire W, and the second cutting blade 22 at the tip 7a of the second arm 7 together with the first cutting blade 21 is transmitted to the second cutting blade. A force N2 that works to cut into the insulating coatings C1 and C2 of W; This is transmitted as a force N3 that acts to move the second arm 7 and the third arm 8 backward to extract the insulation coatings C1 and C2. At this time, N2 >> N3, and the transmission angle θ4 is selected from 60 degrees to 70 degrees so that more force N2 works to cut the coating.

FIG. 9 shows a state immediately after the coverings C1 and C2 of the covered electric wire are cut. The first arm 6 holds the covered electric wire W between the pressing portion 36 at the distal end of the first arm 6 and the distal end portion 2a of the main body 2 and at the same time a part 38 of the first arm 6 is fixed to the main body 2 Placed in. At this time, the movement of the force N2 acting so as to cut into the insulation coatings C1 and C2 of the covered electric wire W is restricted. However, the force N3 for moving the second arm 7 and the third arm 8 backward to extract the coating is applied along the long hole 32 extending in the longitudinal direction to the rear end of the first arm 6 along the shaft 18, Together with the roller 19, the second arm 7 and the third arm 8 can be moved backward. At this time, the roller 15 of the connection link mechanism 4 starts to contact the cam portion 24 provided in the main body 2, and the center of the shaft 14 and the roller 15 of the connection link mechanism 4 is the center of the main body 2 to which the operation lever 3 is attached. The center of the connecting link mechanism 4 and the roller 15 tends to be larger than the radius r0 from the center of the shaft 10 of the main body 2 to which the operation lever 3 is attached.

When the operating lever 3 is rotated by applying an operating force to the operating lever 3 as it is, the roller 15 of the connecting link mechanism 4 remains in contact with the cam portion 24 provided on the main body 2 and the main body to which the operating lever 3 is attached. 2 to move away from the center of the shaft 10 and move the center of the shaft 14 and the roller 15 of the connecting link mechanism 4 to a radius r1 larger than the radius r0 from the center of the shaft 10 of the main body 2 to which the operation lever 3 is attached. Therefore, the rotation of the operation lever 3 can move the second arm 7 and the third arm 8 more together with the shaft 18 and the roller 19 with a small amount of displacement, and the cut insulation coating C1, C2 can be pulled out. At this time, the first link 13 of the connection link mechanism 4 rotates around the shaft 12 and does not restrict the shaft 14 and the roller 15 from being moved by the cam portion 24 of the main body 2. Further, the first link 13 is biased by the spring 38 in the direction of the wall surface 25 of the operation lever 3 at one end 13 a of the first link 13. Therefore, the shaft 14 and the roller 15 are also urged so as not to be separated from the cam portion 24 of the main body 2. Further, the force N1 ′ transmitted from the connecting link mechanism 4 to the conversion mechanism 20 changes from 30 degrees to 50 degrees as shown in FIG. 10, so that N2 ′ <N3 ′. It is advantageous that more force is distributed to pull out the cut insulation coatings C1 and C2. FIG. 11 shows a state in which the covered cut and peel of the covered electric wire W has been completed.

The partially notched front view which shows embodiment of this invention. Sectional drawing of the principal part in embodiment of this invention. The front view of the 1st arm. The front view of a 2nd arm. The front view of a 3rd arm. The side view which shows embodiment of this invention. The partial notch front view of a stripper in the middle stage of lever operation in embodiment of this invention. Sectional drawing of the principal part of FIG. The partial notch front view of a stripper in the middle stage of lever operation in embodiment of this invention. Sectional drawing of a 1st arm, a 2nd arm, a 3rd arm, and a connection link mechanism. The partial notch front view of a stripper in the last step of the lever operation in embodiment of this invention. The perspective view of a covered wire. The perspective view of the stripper of the conventional covered wire | conductor.

Explanation of symbols

13 First link 14 Shaft 15 Roller 16 Spring 17 Second link 24 Cam portion

Claims (2)

The lever operation is clamped between the operating lever (3), the clamping portion (5) that clamps the covered wire (W) by operating the lever (3) and cuts the coating (C1, C2) of the wire (W). A conversion mechanism (20) for converting the operation of the part (5), and a connection link mechanism (4) having an auxiliary drive capability in the connection means of the operation lever (3) and the conversion mechanism (20), and the connection The distance between the shaft (14) of the link mechanism (4) and the shaft (10) of the operating lever (3) varies depending on the position of the operating angle of the operating lever (3). Stripper. In the connection link mechanism (4), the first link (13) and the second link (17) are coupled by a shaft (14), a roller (15) is mounted on the shaft (14), and the operation lever (3 ) Act | operates the 2nd cutting blade (22) of the said clamping part (5), and a roller (15) is applied to the cam part (24) of a main body (2) from the position where the coating | cover of the said electric wire (W) was cut | disconnected. The stripper of a covered electric wire according to claim 1, wherein the distance between the shaft (14) and the shaft (10) increases in a direction in which the cut covering (C1, C2) is extracted.

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