JP2006136073A - Lateral handle type cable cover stripper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lateral handle type cable cover stripper where unreasonableness does not occur in the work posture on a work site because the load needed for the handle operation for cover cutting is small. <P>SOLUTION: This is a lateral handle type cable cover stripper where an under jaw 5 is made via a downward bend 2 at the tip of the main body 1, and a lower edge 6 is fixed to the top side of the under jaw 5, and the tip of a handle 4 is pivoted on the roughly center of the bend 2 by the first pin 3, and an edge block 9 equipped with an upper edge 10 and a slide bearing 15 equipped with a stripping edge 16 are supported, slidably by a slot, by this first pin 3, and the tip of a link 13 pivoted by the third pin 14 of the handle 4 is coupled by the second pin 12 to the rear section of these edge block 9 and the slide bearing 15. A three-node link mechanism is adopted, in which at cutting of a cover, the edge tips of the upper edge 10 and the lower edge 6 and the first pin 3 and the second pin 12 are roughly on the same straight line, and besides the first pin 3, the second pin 12, and the third pin 14 constitute a roughly equilateral triangle. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electric wire covering peeling tool used for peeling an electric wire covering and stripping a core wire at the time of wiring work or the like. The present invention relates to a lateral handle type electric wire coating peeling tool extending in a shape.

  As the lateral handle type electric wire coating peeling tool, the Applicant's tool described in Patent Documents 1 and 2 is widely used. As shown in FIGS. 19 and 20, this tool forms a lower jaw 52 through a downward bent portion at the distal end of a main body 51 positioned parallel to an electric wire to be cut during use, and the upper surface of the lower jaw 52. The lower blade 53 is fixed to the lower jaw 53, the handle 55 is pivotally supported by a pin 54 at the base of the lower jaw 52, and the head 57, the tool rest 58 and the slide receiver 59 are supported by the pin 56 of the main body 51. And a four-bar linkage mechanism connected to the handle 55.

  An upper blade 61 is provided on the lower surface of the distal end portion of the tool post 58, the distal end of the slide receiver 59 is suspended in the direction of the lower jaw 52, and a peeling blade 62 is provided on the upper surface thereof. When the covered electric wire to be cut is placed on the lower blade 53 and the handle 55 is closed, first, as shown in FIG. 19, the head 57 and the tool rest 58 are simultaneously lowered toward the lower jaw 52, and the upper blade 61 is connected to the electric wire. Cut into the coating. When the handle 55 is further closed, the tool post 58 and the slide receiver 59 are retracted as shown in FIG. 20, and the covering sandwiched between the upper blade 61 and the peeling blade 62 from above and below is peeled off from the core wire of the electric wire. Yes.

  Such a horizontal handle type wire sheath peeling tool is more difficult to peel at the actual work site than a vertical handle type wire sheath peeling tool bent downward with respect to the main body and the wire to be cut. In addition, since the whole is easy to downsize, there is an advantage that it is easy to operate even in a narrow place. However, the tools of Patent Documents 1 and 2 sometimes constitute a four-bar linkage mechanism in which the link 60 is inclined rearward, and the force to close the handle 55 does not necessarily act effectively in the direction of cutting and peeling off the coating. There was a problem. For this reason, the load required for the operation of the handle 55 becomes large, and there is a possibility that the hand will be fatigued when used for a long time.

In addition, in the conventional wire sheath peeling tool, the round pin 63 at the upper end of the link 60 slides inside the long hole 64 formed in the head 57. As a result, there was a problem that it was difficult to perform the coating peeling operation.
Japanese Utility Model Publication No. 60-26482 Japanese Examined Patent Publication No. 61-22528

  The present invention solves the above-mentioned conventional problems, the load required for the handle operation for coating peeling is small and can be used lightly, and the horizontal handle type does not cause unreasonable working posture at the actual work site It was made in order to provide the electric wire coating peeling tool.

  The wire covering and peeling tool of the present invention made to solve the above problems forms a lower jaw through a downward bent portion at the tip of a main body extending linearly in parallel with the wire to be cut, A lower blade is fixed to the upper surface of the lower jaw, a tip of a handle that is opened and closed with respect to the main body is pivotally supported by a first pin at a substantially central portion of the bent portion, and a tool post having an upper blade on the first pin; A slide receiver provided with a peeling blade is slidably supported by a long hole, and the tip of a link pivotally supported by the third pin of the handle is connected to the rear part of the tool rest and the slide receiver by a second pin. It has a three-bar linkage mechanism, and the cutting edge of the upper blade and the lower blade, the first pin, and the second pin are located on substantially the same straight line, and the first pin, the second pin, and the third pin are substantially equilateral triangles at the time of covering cutting. It was configured to be It is intended to. It is preferable that the head is pivotally supported on the first pin, a long hole is provided in the head to slidably support the second pin, and the contact portion with the long hole of the second pin is a flat surface.

  Since the electric wire covering peeling tool of the present invention is a horizontal handle type, it is easy to work in a narrow space like wiring work in a distribution board box, and the covering peeling posture at the actual work site is unreasonable. Absent. Further, when cutting the coating, the cutting edges of the upper blade and the lower blade, the first pin, and the second pin are located on substantially the same straight line, and the first pin, the second pin, and the third pin constituting the three-bar linkage mechanism are substantially equilateral triangles. As described in detail below, the load required for the handle operation for peeling the coating is small and can be used lightly. For this reason, a user's fatigue | exhaustion can be reduced compared with the vertical handle type tool and the horizontal handle type tool provided with the conventional 4-joint link mechanism.

Next, a preferred embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a view showing an electric wire coating peeling tool of the present invention. Reference numeral 1 denotes a main body, which extends in a straight line substantially parallel to an electric wire to be cut in a use state. A portion extending rearward of the main body 1 serves as a grip having an anti-slip unevenness. A downwardly bent portion 2 is formed at the tip of the main body 1, and the tip of the handle 4 is pivotally supported by a first pin 3 at the center thereof. As shown in the drawing, a lower jaw 5 is formed at the tip of the main body 1 via a bent portion 2, and a lower blade 6 having guides on both sides is fixed to the upper surface of the lower jaw 5.

  Three members are supported on the first pin 3. The single product shape of each member is shown in FIG. The first member is the head 7 and is pivotally supported so as to be slightly rotatable around the first pin 3. Unlike the other second and third members, the head 7 does not slide. A long hole 8 is provided in the rear portion of the head 7. As shown in FIG. 5, the tip portion of the head 7 is bent at a substantially right angle. The head 7 has a role of holding the electric wire when the coating is peeled off.

  The second member is the tool post 9. The tip of the tool rest 9 is also bent at a substantially right angle, and the downward upper blade 10 is screwed. As shown in FIG. 4, the upper blade 10 and the lower blade 6 are formed in a concave shape so as to cut into the sheath of the electric wire but not cut the core wire. The tool of the present invention is a horizontal handle type, and the opening / closing direction of the upper blade 10 and the lower blade 6 is substantially parallel to the opening / closing direction of the handle 4 with respect to the main body 1. For this reason, the working posture at the actual work site does not occur.

  The tool post 9 is slidable backward to peel off the coating, and the engagement portion with the first pin 3 is a long hole 11. A second pin 12 passes through the rear part of the tool post 9. The tip of a link 13 is pivotally supported on the second pin 12, and the other end of the link 13 is pivotally supported on a third pin 14 of the handle 4. The third pin 14 is located slightly away from the first pin 3 at the tip of the handle.

  Thus, the tool post 9 is supported by the main body 1 by the first pin 3 and the second pin 12, and when the handle 4 is closed from the state of FIG. 1, the upper blade 10 is cut into the cover in FIG. 2. It rotates about the first pin 3 until the position shown, but when it cuts into the sheath and is prevented from further rotation, it is pulled backward by the link 13 and slides to the position shown in FIG.

  The third member is a slide receiver 15. As shown in FIG. 1, the tip of the slide receiver 15 is bent downward to a position in contact with the lower jaw 5 of the main body 1, and a peeling blade 16 is formed upward at the tip. The slide receiver 15 is also slidable backward in order to peel off the coating, and the engagement portion with the first pin 3 is a long hole 17 as shown in FIG. The engaging portion with the second pin 12 is a substantially arc-shaped long hole 18. For this reason, it does not move from the state of FIG. 1 to the state of FIG. 2 (the state in which the covering is cut), but when the handle 4 is further closed from the state of FIG. 2 where the second pin 12 has reached the upper end of the long hole 18, As shown in FIG. 3, the coating can be peeled off by sliding backward. This is shown in FIG.

  As shown in FIG. 9, the portion where the second pin 12 is in contact with the long hole 8 of the head 7 has a flat surface to prevent the second pin 12 from being worn, and no backlash occurs even after long-term use. It is preferable to do so. Such a flat surface can be formed not only on the second pin 12 but also on the first pin 3.

  As described above, the wire covering / peeling tool of the present invention has a three-joint link mechanism having the first pin 3, the second pin 12, and the third pin 14 as joint points. As shown in FIG. At the time of cutting, the cutting edges of the upper blade 10 and the lower blade 6, the first pin 3 and the second pin 12 are located on substantially the same straight line, and the first pin 3, the second pin 12 and the third pin 14 are located. It has become an equilateral triangle. The mechanical meaning of adopting this configuration will be described in detail below in comparison with the conventional lateral handle type wire sheath peeling tool described in Patent Documents 1 and 2.

  First, in this type of electric wire coating peeling tool, the mechanical factors that influence the peeling load are a force for cutting the coating and a force for tearing the coating. The force F transmitted to the second pin 12 via the link 13 when the handle 4 is closed is broken down into Fy direction component force and Fx direction component force. The component force in the Fy direction corresponds to a force for cutting the coating, and the component force in the Fx direction corresponds to a force for tearing the coating. In addition, the action section where each force works effectively is a section where the upper blade 10 and the lower blade 6 intersect each other in the Fy direction component force (actually about 1.5 mm), and the upper blade 10 in the subsequent slide section. It only works to prevent the escaping upward. On the other hand, the component force in the Fx direction acts on the entire slide section, but the largest force is required in the initial slide section. Thus, how much each component force is applied in each effective section is a key to reducing the handle operation force (peeling load), and in particular, the Fy direction component force affects the operability.

  Therefore, as shown in FIGS. 11 and 12, the relationship between the handle operating angle θ and the position of the second pin 12 was calculated for the wire coating peeling tool of the present invention and the wire coating peeling tool of Patent Documents 1 and 2. The handle operating angle θ was as shown in the figure. The result is shown in FIG. FIG. 14 shows the movement amount of the second pin 12 per unit handle operating angle as the movement speed of the second pin 12.

  As shown in FIG. 14, in the electric wire covering peeling tool of the present invention, the moving speed of the second pin 12 at the beginning of the operation of the handle is about half that of the conventional electric wire covering peeling tool shown in Patent Documents 1 and 2. That is, it can be seen that the handle operating angle θ required for the second pin 12 to move in the effective cutting section of 1.5 mm is approximately doubled, and the covering can be cut with a smaller force.

  Next, FIG. 15 shows the relationship between the component force Fy in the cutting direction within the effective cutting section and the handle operation angle necessary for the movement of the second pin 12 within the effective cutting section. However, since the force required to operate the handle greatly changes depending on the handle length, lever ratio, etc., the force F acting on the link extending from the handle is assumed to be the same here. The integrated value indicated by hatching in FIG. 15 is 31.1F for the wire coating peeling tool of the present invention and 20.9F for the conventional wire coating peeling tool. The integral was calculated in the minute handle operation section 0.05 (deg). From this, it can be seen that the work performed by the cutting direction component force Fy in the cutting effective section is about 1.5 times that of the conventional wire sheathing peeling tool of the present invention, and the work that is effectively converted in the cutting direction is large. .

  Next, the relationship between the handle operating angle and the position of the second pin 12 in each case where the link angle β in the three-bar linkage mechanism shown in FIG. 11 is 45 °, 70 °, and 90 ° is calculated. It was shown to. Similarly, the relationship between the handle operating angle and the cutting direction component force Fy was calculated and shown in FIG. As shown in FIG. 16, the larger the link angle β is, the larger the handle operation amount in the effective cutting section is. However, the larger the link angle β is, the smaller the cutting direction component force Fy is, so the cutting shown in FIG. The work performed by the cutting direction component force Fy in the effective section is 24.6 F when β = 45 °, 31.1 F when β = 70 °, and 23.7 F when β = 90 °. Moreover, it becomes 30.9F also when β = 60 °, and becomes maximum around 60 ° to 70 °. For this reason, in this invention, it has arrange | positioned so that the 1st pin 3, the 2nd pin 12, and the 3rd pin 14 may become a substantially equilateral triangle.

  FIG. 18 shows the relationship between the handle operating angle and the peeling direction component force Fx. As shown in this graph, the peeling direction component force Fx in the initial section where the greatest force is required is 0.68 F in the wire coating peeling tool of the present invention, and 0.40 F in the conventional product. The product of the present invention produces about 1.7 times the force in the peeling direction. For this reason, it turns out that the electric wire coating peeling tool of this invention can perform not only coating cutting but coating peeling easily compared with a conventional product.

  As described above, in the wire coating peeling tool of the present invention, the cutting edge of the upper blade and the lower blade, the first pin, and the second pin are positioned on substantially the same straight line, and the first pin, the second pin, and the third pin. By adopting a three-joint link mechanism in which the pin is a regular triangle, the coating can be easily cut and peeled off with a smaller handle operating force. Moreover, since the main body is a horizontal handle type that extends linearly in parallel to the wire to be cut, there is an advantage that the working posture at the actual work site does not become unreasonable and the operability is excellent.

It is a front view which shows the electric wire coating | coated peeling tool of this invention. It is an internal structure figure which shows the state at the time of covering cutting | disconnection. It is an internal structure figure which shows the state at the time of coating peeling completion. It is a side view of the head in the state of FIG. It is a top view in the state of FIG. It is a single item drawing of a head, a tool post, and a slide receiver. It is a related figure of a main body, a tool post, and a slide receiver. It is explanatory drawing of the peeling state of coating | cover. It is a perspective view of the 2nd pin. It is explanatory drawing for dynamic analysis. It is explanatory drawing for dynamic analysis. It is explanatory drawing of the conventional product for dynamic analysis. It is a graph which shows the relationship between a handle | steering-wheel operating angle and the position of a 2nd pin. It is a graph which shows the relationship between a steering wheel operation angle and the moving speed of a 2nd pin. It is a graph which shows the relationship between a steering wheel operation angle and cutting direction component force Fy. It is a graph which shows the relationship between the steering wheel operation angle at the time of changing link angle (beta), and the position of a 2nd pin. It is a graph which shows the relationship between the steering wheel operation angle at the time of changing link angle (beta), and cutting direction component force Fy. It is a graph which shows the relationship between a handle | steering-wheel operating angle and peeling direction component force Fx. It is a front view which shows the state at the time of the covering cutting | disconnection in a prior art example. It is a front view which shows the state at the time of the coating peeling completion in a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Bending part 3 1st pin 4 Handle 5 Mandible 6 Lower blade 7 Head 8 Long hole 9 Tool post 10 Upper blade 11 Long hole 12 2nd pin 13 Link 14 3rd pin 15 Slide receiver 16 Peeling blade 17 Long hole 18 Long hole

Claims (2)

  A lower jaw is formed at the front end of the main body extending linearly in parallel with the wire to be cut through a downward bent portion, and a lower blade is fixed to the upper surface of the lower jaw, and the handle is opened and closed with respect to the main body. The tip of the shaft is pivotally supported by a first pin at the substantially central portion of the bent portion, and a tool rest provided with an upper blade on the first pin and a slide receiver provided with a peeling blade are slidably supported by a long hole, It has a three-bar linkage mechanism in which the tip of the link pivotally supported by the third pin of the handle is connected to the rear part of these tool rest and slide receiver by the second pin, and the cutting edges of the upper blade and the lower blade at the time of covering cutting And a first pin and a second pin are located on substantially the same straight line, and the first pin, the second pin, and the third pin are substantially equilateral triangles.   The head is pivotally supported on the first pin, a long hole is provided in the head for slidably supporting the second pin, and a contact portion with the long hole of the second pin is a flat surface. Item 2. The horizontal handle type wire sheath peeling tool according to Item 1.

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