JP3190422U - Cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting tool capable of easily cutting a beam having a U-shaped cross section with a small operating force. SOLUTION: A first operating blade 2 and a second operating blade 3 rotatably connected in a non-intersecting posture, and a first cutting member 4 and a second cutting member 5 rotatably connected in a non-intersecting posture. The base end of the first cutting member 4 and the tip of the first operating blade 2 are rotatably connected to each other, and the base end of the second cutting member 5 and the tip of the second operating blade 3 The first cutting member 4 has the first cutting blade forming portion 10 on the tip end side thereof, and the second cutting member 5 is targeted by the first cutting blade forming portion 10 on the tip end side thereof. It has a second cutting blade forming portion 11 capable of cutting an object, the first cutting member 4 has a third cutting blade forming portion 12 on the proximal end side thereof, and the second cutting member 5 faces the proximal end side thereof. It has a fourth cutting blade forming portion 13 capable of cutting an object with a third cutting blade forming portion 12 extending along the line. [Selection diagram] Fig. 1

Description

  The present invention relates to a cutting tool.

  There are many cutting tools on the market for cutting various plate materials, wire rods and the like. For example, a scissors-shaped cutting tool is used to cut a channel material having a U-shaped cross section (also called a ceiling base material) that is stretched over the back side (upper side) of a ceiling board during electrical work or the like. It is done. The channel material is cut by first cutting the ceiling plate as small as possible and inserting a cutting tool through the opening. This channel material is often a metal channel material as disclosed in the following publications. That is, many channel materials have a shape having a bottom plate portion and a pair of side wall portions that are bent and erected on both ends of the bottom plate portion. The channel material is stretched with its opening facing upward.

  As such a cutting tool, scissors for electrical work disclosed in Japanese Patent Application Laid-Open No. 2006-110300 are known.

  The scissors disclosed in Japanese Patent Application Laid-Open No. 2006-110300 are such that the upper handle and the lower handle of the scissors are rotatably supported at their tips by a support shaft. Both the upper handle and the lower handle are bent in an L shape. From the tip of the upper handle, the upper blade extends in a direction intersecting the axis of the upper handle, and the lower blade extends in a direction intersecting the axis of the lower handle. For this reason, the entire scissors are U-shaped. In this scissor, since it is easy to contact | abut to the periphery of the small opening of a ceiling board, the cutting operation from under a channel material is troublesome.

JP 2006-110300 A

  The present invention has been made in view of the present situation. In the present invention, for example, when a member such as a channel member having a U-shaped cross section is cut from below, the member can be cut with a relatively small operating force, and the bottom plate portion of the channel member can be easily cut. The purpose is to provide a cutting tool.

The cutting tool according to the present invention is
A first operating rod and a second operating rod, which are pivotably connected to each other by a first support shaft in a posture that does not cross each other;
A first cutting member and a second cutting member, which are pivotably connected to each other by a second support shaft in a posture that does not cross each other,
A proximal end portion of the first cutting member is rotatably connected to a distal end portion of the first operating rod by a third support shaft;
A proximal end portion of the second cutting member is rotatably connected to a distal end portion of the second operating rod by a fourth support shaft;
The first cutting member has a first cutting blade forming portion on the tip side from the connecting portion with the second cutting member,
The second cutting member has a second cutting blade forming portion that is capable of cutting the object by closing the first cutting blade forming portion and the first cutting blade forming portion on the tip side from the connecting portion with the first cutting member. ,
The first cutting member has a third cutting blade forming portion on the proximal side from the connecting portion with the second cutting member,
The second cutting member has a fourth cutting blade forming portion that extends toward the base end side from the connecting portion with the first cutting member and can cut the object by closing the third cutting blade forming portion and each other. doing.

Preferably, the third cutting blade forming portion and the fourth cutting blade forming portion are in a closed state and extend toward the proximal ends of the first operating rod and the second operating rod,
This extending direction forms a parallel or acute angle with respect to a virtual straight line passing through the first support shaft and the intermediate point between the two operating rods.

Preferably, in the second cutting member, a space portion is formed by the base portion on the proximal end side from the connection portion with the first cutting member and the fourth cutting blade forming portion on the distal end side from the connection portion. ,
An inclined portion whose thickness gradually decreases toward the space portion is formed at a connection portion between the base portion and the fourth cutting blade forming portion.

  Preferably, of the third cutting blade forming portion and the fourth cutting blade forming portion, at least the third cutting blade forming portion has a contact surface extending in a direction perpendicular to the cutting direction and capable of contacting an object to be cut. doing.

  According to this cutting tool, for example, when a member such as a channel material having a U-shaped cross section is cut from below, not only the side wall portion but also the bottom plate portion can be easily cut and a small operation can be performed. It is possible by force.

FIG. 1 is a front view illustrating a cutting tool according to an embodiment of the present invention in a state where a cutting blade is opened. FIG. 2 is a front view showing a state in which the cutting blade of the cutting tool in FIG. 1 is closed. Fig.3 (a) is a front view which shows the connection state of the 1st operating rod and the 1st cutting member of the cutting tool of FIG. 1, FIG.3 (b) is a 2nd operating rod and a 2nd cutting member. It is a front view which shows the connection state with. FIG. 4 is a front view of a cutting tool according to another embodiment of the present invention in a state where a cutting blade is opened. FIG. 5 is a front view showing a state in which the cutting blade of the cutting tool in FIG. 4 is closed. FIG. 5 is a rear view showing a state where the cutting blade of the cutting tool of FIG. 4 is opened. FIG. 7 is a perspective view showing a second cutting member of the cutting tool of FIG.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

  The cutting tool 1 is shown by FIG.1 and FIG.2. FIG. 1 shows the cutting tool 1 in an open state, and FIG. 2 shows the cutting tool 1 in a closed state. The cutting tool 1 is different in structure from a general scissor composed of a pair of blade members intersecting each other. The cutting tool 1 includes a pair of operating rods 2 and 3 that do not cross each other and a pair of cutting members 4 and 5 that do not cross each other. Details are as follows.

  In the cutting tool 1, the first operating rod 2 and the second operating rod 3 are rotatably connected to each other by the first support shaft 6 in a posture that does not intersect each other. The proximal end side of the first operating rod 2 and the second operating rod 3 from the interconnecting portion 6a constitutes the grip operating portions 2a and 3a. Moreover, the 1st cutting member 4 and the 2nd cutting member 5 are mutually connected by the 2nd support shaft 7 with the attitude | position which does not cross | intersect so that rotation is possible.

  Each of the pair of operation rods 2 and 3 has a U-shaped cross section. A torsion coil spring 16 is mounted between the pair of operating rods 2 and 3. The torsion coil spring 16 is attached to the first support shaft 6, and one arm portion is locked to one operation rod 2 and the other arm portion is locked to the other operation rod 3. Accordingly, the torsion coil spring 16 applies a spring force to open the pair of operating rods 2 and 3 to open them. If necessary, a ring-shaped rubber band B is fitted to the pair of grip operation portions 2a and 3a in order to prevent the pair of operation rods 2 and 3 from opening. The force that pushes the operating rods 2 and 3 open may be applied by another configuration, such as a compression coil spring.

  As shown in FIG. 3A, the base end portion 4 a of the first cutting member 4 is rotatably connected to the tip end portion 2 b of the first operating rod 2 by the third support shaft 8. As shown in FIG. 3B, the base end portion 5 a of the second cutting member 5 is rotatably connected to the distal end portion 3 b of the second operating rod 3 by the fourth support shaft 9.

  As shown in FIG. 3A, a first cutting blade forming portion 10 is formed on the first cutting member 4 on the distal end 4 b side from the connecting portion 7 a with the second cutting member 5. As shown in FIG. 3B, a second cutting blade forming portion 11 is formed on the second cutting member 5 on the tip 5b side from the connecting portion 7a with the first cutting member 4. Blades 17 are respectively formed on the outer edges of the first cutting blade forming portion 10 and the second cutting blade forming portion 11 facing each other. Here, “the blade is formed” means that the edge surface 10f of the first cutting blade forming portion 10 has an acute angle with respect to the cutting direction A if the first cutting blade forming portion 10 is taken as an example. It means what is done. When the 1st cutting blade formation part 10 and the 2nd cutting blade formation part 11 close, the cutting target object between them is cut | disconnected. Here, the “cutting direction A” is a direction perpendicular to the outer edge of the cutting blade forming portion extending linearly.

  As shown in FIG. 2, with the first cutting blade forming portion 10 and the second cutting blade forming portion 11 being closed, the straight line formed by the blades 17 of these cutting blade forming portions 10, 11 is the cutting tool 1. Toward the tip 1b, it extends in a direction that forms an acute angle α with respect to the intermediate axis CL between the grip operation portions 2a and 3a. The intermediate axis CL is a straight line that passes through the connecting portion 6a between the grip operation portions 2a and 3a and passes through an intermediate point between the grip operation portions 2a and 3a in the cross section of the base end 1a of the cutting tool 1. Both the 1st cutting blade formation part 10 and the 2nd cutting blade formation part 11 are comprised so that it may extend in the direction parallel to the said intermediate axis CL toward the front-end | tip 1b of the cutting tool 1 as needed. Also good.

  As shown in FIG. 3A, a third cutting blade forming portion 12 is formed on the base portion 4c on the base end 4a side of the connecting portion 7a with the second cutting member 5 in the first cutting member 4. Yes. As shown in FIG. 3B, the fourth cutting blade forming portion 13 is formed so as to extend toward the base end 5a side from the connecting portion 7a of the second cutting member 5 with the first cutting member 4. ing. The fourth cutting blade forming portion 13 extends so as to face the third cutting blade forming portion 12. The base portion 5c of the second cutting member 5 and the fourth cutting blade forming portion 13 form a space S1 having a substantially V-shaped outer shape or a substantially U-shaped outer shape. A contact surface 19 is formed on the outer edge of the third cutting blade forming portion 12 that faces the fourth cutting blade forming portion 13. A blade 18 is formed on the outer edge of the fourth cutting blade forming portion 13 that faces the third cutting blade forming portion 12. The contact surface 19 is an end surface extending in a direction perpendicular to the cutting direction, and is a surface with which a surface of an object to be cut contacts. The blade forms an acute angle with respect to the cutting direction, but the contact surface is substantially perpendicular. When the third cutting blade forming part 12 and the fourth cutting blade forming part 13 are closed, the cutting object is cut.

  As shown in FIG. 2, the third cutting blade forming portion 12 and the fourth cutting blade forming portion 13 extend toward the base end 1 a side (the base end side of the operation rods 2 and 3) of the cutting tool 1. Yes. More specifically, in a state where the third cutting blade forming portion 12 and the fourth cutting blade forming portion 13 are closed, the straight line formed between the contact surface 19 of the cutting blade forming portions 12 and 13 and the blade 18 is cut. To the base end 1a of the tool 1, it extends in a direction that forms an acute angle θ with respect to the intermediate axis CL between the grip operation portions 2a and 3a. This acute angle θ is formed from the intermediate axis CL toward the same outer side (left side in FIG. 2) as the acute angle α. Both the third cutting blade forming portion 12 and the fourth cutting blade forming portion 13 are configured to extend in a direction parallel to the intermediate axis CL toward the base end 1a of the cutting tool 1 as necessary. May be.

  As shown in FIG. 1, when the pair of grip operation portions 2 a and 3 a are opened, the tip portions 2 b and 3 b of the first operation rod 2 and the second operation rod 3 are closed, and the first cutting member 4 and the second operation rod 2 are closed. The base ends 4a and 5a of the cutting member 5 are also closed. Thereby, each front-end | tip part 4b, 5b of the 1st cutting member 4 and the 2nd cutting member 5 opens, and the 4th cutting blade formation part 13 of the 2nd cutting member 5 from the base 4c of the 1st cutting member 4 is formed. Separate. That is, the first cutting blade forming portion 10 and the second cutting blade forming portion 11 are opened, and the third cutting blade forming portion 12 and the fourth cutting blade forming portion 13 are also opened.

  As shown in FIG. 2, when the pair of grip operation portions 2 a and 3 a are closed, the tip portions 2 b and 3 b of the first operation rod 2 and the second operation rod 3 are opened, and the first cutting member 4 and the second operation rod 2 are opened. The base ends 4a and 5a of the cutting member 5 are also opened. Thereby, each front-end | tip part 4b, 5b of the 1st cutting member 4 and the 2nd cutting member 5 closes, and the 4th cutting blade formation part of the 2nd cutting member 5 with respect to the base 4c of the 1st cutting member 4 13 closes. That is, the first cutting blade forming portion 10 and the second cutting blade forming portion 11 are closed, and the third cutting blade forming portion 12 and the fourth cutting blade forming portion 13 are closed.

  As shown in FIG. 2, in the pair of operation rods 2 and 3, the lengths of the grip operation parts 2 a and 3 a are much longer than the distance M from the interconnection part 6 a to the third and fourth support shafts 8 and 9. Have been long. Further, in the pair of cutting members 4, 5, the distance N from the second support shaft 7 to the connecting portions 8 a, 9 a between the pair of operating rods 2, 3 is determined from the second support shaft 7 to the first cutting blade forming portion 10. And the distance from the second support shaft 7 to the second cutting blade forming portion 11 is longer. In other words, the distance from the fulcrum as the lever to the force point is much longer than the distance from the fulcrum to the action point in both the operation rods 2 and 3 and the cutting members 4 and 5. By the action of the two-stage lever, the user can cut the object with a light operating force.

  As described above, the third cutting blade forming portion 12 and the fourth cutting blade forming portion 13 both extend toward the base ends 4a and 5a that form an acute angle θ with respect to the intermediate axis CL between the grip operation portions 2a and 3a. Yes. Therefore, when the cutting tool 1 cuts the side wall of the channel material having the above-mentioned U-shaped cross section from below, the grip operation portions 2a and 3a are gripped with the fourth cutting blade forming portion 13 hooked on the side wall. do it. This cutting operation is easy.

  As described above, both the first cutting blade forming portion 10 and the second cutting blade forming portion 11 extend toward the tip that forms an acute angle α with respect to the intermediate axis CL between the grip operation portions 2a and 3a. Therefore, when cutting the bottom plate portion of the channel material after the side walls on both sides have already been cut from below, so that the bottom plate portion enters between the first cutting blade forming portion 10 and the second cutting blade forming portion 11, What is necessary is just to make the cutting tool 1 approach from diagonally downward. In this state, the grip operation units 2a and 3a may be gripped. This cutting operation is easy. Thus, the channel material having a U-shaped cross section can be easily cut from below by using only the cutting tool 1.

  4, 5, and 6 show another cutting tool 21. The cutting tool 21 has first and second cutting members 22 and 23 different from the first and second cutting members 4 and 5 of the cutting tool 1 of FIG. The first and second operation rods 2 and 3 of the cutting tool 21 have the same configuration as the first and second operation rods 2 and 3 of the cutting tool 1 of FIG. With respect to the configuration of the cutting tool 21 other than the above-described differences from the cutting tool 1 of FIG. 1, the same reference numerals are given to the same members, and descriptions thereof are omitted. As with the cutting tool 1 of FIG. 1, the cutting tool 21 can also have preferable effects including an efficient lever action.

  As shown in FIG. 5, the first differences between the cutting members 22 and 23 of the cutting tool 21 and the cutting members 4 and 5 of the cutting tool 1 of FIG. The four cutting blade forming portions 27 are formed on the opposite side of the first cutting blade forming portion 24 and the second cutting blade forming portion 25 with respect to the intermediate shaft CL between the pair of grip operation portions 2a and 3a. . In the cutting tool 1 of FIG. 1, the first cutting blade forming portion 10, the second cutting blade forming portion 11, the third cutting blade forming portion 12, and the fourth cutting blade forming portion 13 are all on the left side of the intermediate shaft CL in the drawing. Is formed. On the other hand, in the cutting tool 21 of FIG. 4, the first cutting blade forming portion 24 and the second cutting blade forming portion 25 are on the left side of the intermediate shaft CL, and the third cutting blade forming portion 26 and the fourth cutting blade forming portion 27 are the intermediate shaft. It is formed on the right side of CL. The second difference is that an inclined portion 28 whose thickness gradually decreases is formed on the surface of the second cutting member 23.

  A blade 30 is formed in each of the first cutting blade forming portion 24 and the second cutting blade forming portion 25. In the cutting tool 21, both the first cutting blade forming portion 24 formed on the first cutting member 22 and the second cutting blade forming portion 25 formed on the second cutting member 23 have their blades 30. A straight line formed extends toward the tip 21b of the cutting tool 21 in a direction that forms an acute angle β with respect to the intermediate axis CL.

  As shown in FIGS. 4, 5, and 6, the third cutting blade forming portion 26 is formed on the base portion 22 c on the base end 22 a side of the connecting portion 7 a with the second cutting member 23 in the first cutting member 22. Is formed. The third cutting blade forming portion 26 is formed on the outer side of the base portion 22 c, that is, on the side opposite to the second cutting member 23. The 4th cutting blade formation part which can cut | disconnect the cutting target object D by closing the said 3rd cutting blade formation part 26 mutually in the side part of the connection part 7a with the 1st cutting member 22 in the 2nd cutting member 23. 27 is formed. The fourth cutting blade forming portion 27 extends from the side of the connecting portion 7a toward the base ends 22a and 23a. As a result, the fourth cutting blade forming portion 27 can face the third cutting blade forming portion 26. A contact surface 32 is formed on the outer edge of the third cutting blade forming portion 26 that faces the fourth cutting blade forming portion 27. A blade 31 is formed on the outer edge of the fourth cutting blade forming portion 27 that faces the third cutting blade forming portion 26.

  As shown in FIGS. 4, 5 and 7, the base 23c of the second cutting member 23 and the fourth cutting blade forming portion 27 form a space S2 having a substantially V-shaped outer shape or a substantially U-shaped outer shape. ing.

  As shown in FIG. 5, the straight line formed between the contact surface 32 of the two cutting blade forming portions 26 and 27 and the blade 31 in a state where the third cutting blade forming portion 26 and the fourth cutting blade forming portion 27 are closed. However, it extends in a direction substantially parallel to the intermediate axis CL toward the base end 21 a of the cutting tool 21. Both the third cutting blade forming portion 26 and the fourth cutting blade forming portion 27 are configured to extend in a direction that forms an acute angle with respect to the intermediate axis CL toward the proximal end 21a of the cutting tool 21 as necessary. May be. This acute angle is formed in the direction opposite to the acute angle β (to the right in FIG. 5).

  As shown in FIG. 7, the inclined portion 28 is formed on the surface of the connection portion 29 between the base portion 23 c of the second cutting member 23 and the fourth cutting blade forming portion 27. The inclined portion 28 is formed so that the thickness of the second cutting member 23 gradually decreases from the opposite side of the substantially V-shaped outer space S2 in the connecting portion 29 toward the inner end of the space S2. . The thickness of the second cutting member 23 is close to 0 at the periphery of the inner end of the space S2.

  As shown in FIG. 5, the inclined portion 28 is formed by the cutting tool 21 for the cut object D when the object D is cut by the third cutting blade forming part 26 and the fourth cutting blade forming part 27. It is formed for the purpose of reducing the resistance of relative movement. Since the inclined portion 28 is formed, the plate-like object D cut by the third cutting blade forming portion 26 and the fourth cutting blade forming portion 27 is removed from the second cutting member 23 having a thickness close to 0. It can move without receiving great resistance.

  The third cutting blade forming portion 26 and the fourth cutting blade forming portion 27 are formed on the side opposite to the first cutting blade forming portion 24 and the second cutting blade forming portion 25 with respect to the intermediate shaft CL. This is to avoid a situation in which the plate-like object D that is in contact with the first cutting member 22 increases the movement resistance. Further, this is because the inclined portion 28 is easily formed without causing a problem of buffering with other parts of the cutting tool 21. The other part of the cutting tool 21 that can buffer the inclined portion 28 is, for example, the second support shaft 7. Further, as shown in FIG. 6, the fourth cutting blade forming portion is formed from the virtual straight line along the third cutting blade forming portion 26 on the tip 22 b side from the third cutting blade forming portion 26 in the first cutting member 22. Since there is no portion projecting to the 27 side, the plate-like object D cut by the third cutting blade forming portion 26 and the fourth cutting blade forming portion 27 does not come into contact with the first cutting member 22 and does not contact the first cutting member 22. It can easily move to the tip 21b side.

  In the embodiment described above, a channel material having a U-shaped cross section is taken as an example of a cutting target, but the material is not limited to such a member. The cutting tool of the present invention can be applied to various plate materials, bar materials, wire materials, and the like. In the embodiment described above, the contact surfaces 19 and 32 are formed on the third cutting blade forming portions 12 and 26, and the other cutting blade forming portions 10, 11, 13, 24, 25 and 27 are provided on the third cutting blade forming portions 12 and 26. Blades 17, 18, 30, 31 are formed. However, it is not limited to such a configuration. You may form a contact surface or a blade in arbitrary cutting blade formation parts.

  The cutting object of the cutting tool according to the present invention is not limited to the channel material having a U-shaped cross section. Although this cutting tool can cut various objects including wire rods, it is mainly suitable for cutting plate-like objects.

DESCRIPTION OF SYMBOLS 1,21 ... Cutting tool 2 ... 1st operation rod 3 ... 2nd operation rod 4, 22 ... 1st cutting member 5, 23 ... 2nd cutting member 6 ... 1st Support shaft 7 ... Second support shaft 8 ... Third support shaft 9 ... Fourth support shaft 10, 24 ... First cutting blade forming portion 11, 25 ... Second cutting blade forming portion 12, 26 ... Third cutting blade forming portion 13, 27 ... Fourth cutting blade forming portion 16 ... Torsion coil spring 17, 18, 30, 31 ... Blade 19, 32 ... Contact Surface 28 ... Inclined portion 29 ... Connection portion A ... Cutting direction B ... Rubber band D ... Channel materials S1, S2 ... Spaces α, β ... (Formation of first cutting blade) Inclination angle θ (of the third cutting blade forming portion and the fourth cutting blade forming portion)

Claims (4)

A first operating rod and a second operating rod, which are pivotably connected to each other by a first support shaft in a posture that does not cross each other;
A first cutting member and a second cutting member, which are pivotably connected to each other by a second support shaft in a posture that does not cross each other,
A proximal end portion of the first cutting member is rotatably connected to a distal end portion of the first operating rod by a third support shaft;
A proximal end portion of the second cutting member is rotatably connected to a distal end portion of the second operating rod by a fourth support shaft;
The first cutting member has a first cutting blade forming portion on the tip side from the connecting portion with the second cutting member,
The second cutting member has a second cutting blade forming portion that is capable of cutting the object by closing the first cutting blade forming portion and the first cutting blade forming portion on the tip side from the connecting portion with the first cutting member. ,
The first cutting member has a third cutting blade forming portion on the proximal side from the connecting portion with the second cutting member,
The second cutting member has a fourth cutting blade forming portion that extends toward the base end side from the connecting portion with the first cutting member and can cut the object by closing the third cutting blade forming portion and each other. Cutting tool. The third cutting blade forming portion and the fourth cutting blade forming portion are in a closed state and extend toward the proximal end sides of the first operating rod and the second operating rod,
The cutting tool according to claim 1, wherein the extending direction forms a parallel or acute angle with respect to an imaginary straight line passing through the first support shaft and an intermediate point between the two operating rods. In the second cutting member, a space portion is formed by the base portion on the base end side from the connecting portion with the first cutting member, and the fourth cutting blade forming portion on the tip end side from the connecting portion,
The cutting tool according to claim 1 or 2, wherein an inclined portion whose thickness gradually decreases toward the space portion is formed at a connection portion between the base portion and the fourth cutting blade forming portion.   Of the third cutting blade forming portion and the fourth cutting blade forming portion, at least the third cutting blade forming portion has an abutting surface extending in a direction perpendicular to the cutting direction and capable of abutting an object to be cut. The cutting tool according to any one of claims 1 to 3.

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