Nippers

Abstract

To provide a pair of nippers that is both user-friendly and economical, by allowing only the blade to be replaced when it becomes worn or deteriorated. [Solution] A pair of nippers 1 comprising a head member 10 having a blade and an operating member for operating the opening and closing of the head member 10, wherein the head member 10 includes a pair of base materials 11 and 12, the front end of each base material being a blade portion 15 on which a blade is formed, and a connecting portion 16 is provided at the rear end of each base material, the base material 11 and 12 being connected so as to be able to open and close around a pivot shaft 13, and the operating member having a pair of handles 20 and 20, the handle 20 being connected to the connecting portion 16 of the base material 11 and the handle 20 being connected to the connecting portion 16 of the base material 12.

Description

Technical Field

[0001] The present invention relates to nippers having a cutting blade, and particularly to nippers suitable for cutting copper wires and thin metal wires.

Background Art

[0002] As nippers of this type, the nippers disclosed in Patent Document 1 and the nippers disclosed in Patent Document 2 are known.

[0003] Conventional nippers have a pair of stays (or a pair of half-member parts) having a blade part on the tip side and a gripping operation part on the rear part side, which are rotatably connected by a support shaft device, and the blade part opens and closes by operating the gripping operation part.

[0004] In addition, as described in FIGS. 7, 15 to 18 of Patent Document 1 and Patent Document 3, a conventional support shaft device has a structure in which a pair of stays or half-member parts integrally formed of a metal material are rotatably connected and fixed using a support shaft.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0006] Since a conventional nipper has a pair of a blade part and a gripping operation part, when the blade wears due to use or the like, it is impossible to replace only the blade part.

[0007] The present invention aims to provide a pair of nippers that is easy to use, environmentally friendly, and economical, by allowing only the blade portion to be replaced when the blade becomes worn and deteriorated. The main objective of the present invention is to provide a pair of nippers in which parts that have worn out and deteriorated due to prolonged use can be replaced. [Means for solving the problem]

[0008] The present invention relates to a pair of nippers comprising a head member having a blade and an operating member for operating the opening and closing of the head member, wherein the head member includes a pair of base materials, the front end of each base material is a blade portion on which a blade is formed, a connecting portion is provided at the rear end of each base material, the base materials are connected so as to be able to open and close around a pivot shaft, and the operating member has a pair of handles, the handle is connected to the connecting portion of the base material, and the handle is connected to the connecting portion of the other base material.

[0009] Furthermore, the present invention provides a nipper according to claim 1, wherein the connecting portion is provided with a contact surface, a screw hole drilled perpendicularly from the contact surface at a predetermined position on the contact surface, and a cylindrical pin erected on the contact surface at a predetermined distance from the screw hole, and a connecting surface portion is provided on the tip side of each of the one handle and the other handle, the connecting surface portion has a mounting surface facing the contact surface and a surface opposite to the mounting surface, the connecting surface portion has a fixing hole for mounting a countersunk screw and an elongated hole for receiving the cylindrical pin, the fixing hole has a screw head receiving portion that is conically recessed from the surface in the thickness direction of the connecting surface portion, and the inner diameter of the elongated hole is sandwiched in the direction away from the fixing hole.

[0010] Furthermore, the present invention relates to the nippers according to claim 1 or 2, wherein the one handle and the other handle each have an elongated shape extending from the front end to the rear end, and a cylindrical resin grip can be attached to the rear end, and each handle has a retaining projection in the middle of the elongated shape that protrudes outward from the surface of the handle, the retaining projection has a shape that rises diagonally from the rear to the front of the handle and the tip drops down at approximately a right angle, and the resin grip has a window formed at a position corresponding to the retaining projection when attached to the handle, which exposes the retaining projection. [Effects of the Invention]

[0011] According to the present invention, when the blade formed on the head member wears down and deteriorates, the operating member can be removed from the head member and the head member can be replaced with a new one. Therefore, only the head member, including the blade that has worn down due to use, can be replaced.

[0012] Therefore, by making it possible to replace only a part, the head component, rather than the entire nipper, the amount of waste is reduced, resulting in a tool that is less burdensome on the environment and more economical.

[0013] Furthermore, by simply replacing the head component, it's possible to restore the sharpness of the blades to a pair of nippers that already have a comfortable, familiar feel in the hand.

[0014] The connecting portion of the head component and the connecting surface of the handle can be precisely positioned and fixed using a single countersunk screw. Furthermore, the fitting of the cylindrical pin and the elongated hole prevents any looseness or misalignment. Therefore, the connection between the head component and the handle can be achieved with a simple structure, yet it is strong and accurate.

[0015] Furthermore, when a cylindrical resin grip is attached to the handle, by fitting the window of the resin grip onto the retaining projection, the resin grip will not slide down from the handle. Therefore, the resin grip can be securely attached to the handle without using an adhesive. Also, when the resin grip wears out and needs to be replaced, the replacement can be easily carried out.

Brief Description of the Drawings

[0016] [Figure 1] FIG. 1 is a front view of the nipper 1 according to an embodiment of the present invention. [Figure 2] FIG. 2 is a left side view of the nipper 1 according to an embodiment of the present invention. [Figure 3] FIG. 3 is a rear view of the nipper 1 according to an embodiment of the present invention. [Figure 4] FIG. 4 is a front view of the state where the wire spring 2 and the resin grip 5 are attached to the nipper 1 according to an embodiment of the present invention. [Figure 5] FIG. 5 is a left side view of the state where the wire spring 2 and the resin grip 5 are attached to the nipper 1 according to an embodiment of the present invention. [Figure 6] FIG. 6 is a diagram showing an example of the configuration of the wire spring 2, where (A) is a perspective view, (B) is a front view, and (C) is a left side view. [Figure 7] FIG. 7 is a perspective view showing an example of the configuration of the resin grip 5. [Figure 8] FIG. 8 is a front view of the handle 20 according to an embodiment of the present invention. [Figure 9] FIG. 9 is a left side view of the handle 20 according to an embodiment of the present invention, and the configuration of the tip portion is shown in cross section. [Figure 10] FIG. 10 is an exploded perspective view for explaining the method of connecting the handle 20 to the head member 10. [Figure 11] FIG. 11 is an enlarged cross-sectional view taken along line A - A of FIG. 1. [Figure 12] FIG. 12 is a diagram showing a modified example of the resin grip. [Figure 13] FIG. 13 is a perspective view of a nipper according to another embodiment of the present invention. [Figure 14] FIG. 14 is a perspective view of a nipper according to another embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0017] Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a front view of a nipper 1 according to an embodiment of the present invention, FIG. 2 is a left side view of the nipper 1, and FIG. 3 is a rear view of the nipper 1. Further, FIG. 4 is a front view of a state where a wire spring 2 and resin grips 5, 5 are attached to the nipper 1 according to an embodiment of the present invention, and FIG. 5 is a left side view of the nipper 1 shown in FIG. 4.

[0018] Referring to FIGS. 1 to 3, the nipper 1 has a configuration in which a pair of handles 20, 20 are connected to a head member 10 having a blade. The pair of handles 20, 20 are operating members for operating the opening and closing of the head member 10.

[0019] The head member 10 has a configuration in which a pair of one base material 11 and the other base material 12 are connected by a support shaft 13 so as to be openable and closable about the support shaft 13. The one base material 11 and the other base material 12 may be made of, for example, carbon steel in the same form as each other. The tip side of each base material 11, 12 is a blade portion 15 where a blade 14 is formed, and the rear end side of each base material 11, 12 is a connecting portion 16 to which the handle 20 is connected.

[0020] The pair of handles 20, 20 are made of an alloy steel such as stainless steel, high-tensile steel, or carbon steel, and are identical in shape to each other. A connecting surface portion 21 is provided at the tip of each handle. The handles 20, 20 also have an operating portion 22 that curves gently backward from the connecting surface portion 21. In Figures 1 and 3, the operating portions 22 of the pair of handles 20, 20 are curved outward symmetrically because the frontal orientation of one handle 20 is opposite to that of the other handle 20. In other words, the pair of handles 20, 20 have identical shapes when their orientations are aligned.

[0021] The connection between the head member 10 and the pair of handles 20, 20 is made as follows: The connecting surface portion 21 of one handle 20 is superimposed on the connecting portion 16 of one base material 11, and the elongated hole 23 formed in the connecting surface portion 21 is engaged with the cylindrical pin 17 erected on the connecting portion 16, and the connecting portion 16 and the connecting surface portion 21 are fixed together with countersunk screws 24. Similarly, the connecting surface portion 21 of the other handle 20 is superimposed on the connecting portion 16 of the other base material 12, and the elongated hole 23 formed in the connecting surface portion 21 is engaged with the cylindrical pin 17 erected on the connecting portion 16, and the connecting portion 16 and the connecting surface portion 21 are fixed together with countersunk screws 24.

[0022] The cylindrical pin 17 is positioned vertically from the connecting portion 16, with its base inserted and fixed into a mounting base drilled in the thickness direction of the connecting portion 16.

[0023] A wire spring 2 is attached to one of the handles 20 of the nippers 1, which has a head member 10 to which a pair of handles 20, 20 are connected. Then, cylindrical resin grips 5, 5 are placed over each handle 20, 20 from the rear end (bottom in the figure). The wire spring 2 attached to one of the handles 20 will not come off naturally once attached. However, once covered by the resin grip 5, it will never come off the handle 20. The wire spring 2 provides elastic force between the pair of connecting parts 16 so that the blade portion 15 of the head member 10 opens when the head member 10 is closed by gripping the pair of handles 20, 20. When the wire spring 2 is attached to the handles 20, the handles 20, 20 are elastically biased in the direction of opening, improving the usability of the nippers 1.

[0024] Figure 6 shows an example of the configuration of the wire spring 2, where (A) is a perspective view, (B) is a front view, and (C) is a left side view. In Figure 6, arrow X indicates the horizontal direction along the surface of the handle 20, and arrow Z indicates the vertical direction perpendicular to the surface of the handle 20. The wire spring 2 may be formed from an elastic steel wire, for example, with a diameter of about φ = 0.8 to 1.2 mm.

[0025] The wire spring 2 includes, in order from the rear end (lower side in Figure 6) to the front end (upper side in Figure 6), a base locking portion 2a bent in the -Z direction, a -surface-side portion 2b extending in the X direction, an intermediate locking portion 2c bent in the Z direction, another surface-side portion 2d extending in the X direction, a front-facing portion 2e extending in the X direction, and a front-facing sliding portion 2f bent in the -Z direction. The rear end of the wire spring 2 is locked and fixed to one handle 20 by the base locking portion 2a, the -surface-side portion 2b, the intermediate locking portion 2c, and the other surface-side portion 2d, and elasticity is provided to the connecting surface portion 21 of the other handle 20 and the connecting portion 16 of the head member 10 by the front-facing portion 2e and the front-facing sliding portion 2f.

[0026] As shown in Figure 1, each handle 20 has a rear recess 26 on its outer surface for engaging the base locking portion 2a of the wire spring 2, and a front recess 27 on its inner surface for engaging the intermediate locking portion 2c of the wire spring 2.

[0027] Furthermore, each handle 20's operating section 22 is provided with a retaining projection 28 that protrudes outward from the inner surface, located behind a front recess 27 on its inner surface. The retaining projection 28 rises diagonally outward from the rear of the handle 20 toward the front, and its tip slopes down at approximately a right angle.

[0028] Figure 7 is a perspective view showing an example of the configuration of the resin grip 5. The resin grip 5 is made of, for example, an elastomer-type thermoplastic resin. The resin grip 5 has an elongated shape that follows the shape of the handle 20, and an opening 51 is formed at its tip side (upper left side in Figure 7) for inserting the handle 20 from its rear end. Inside the resin grip 5, an elongated handle housing space (not shown) is formed that extends inward from the opening 51. In other words, the resin grip 5 is a long cylindrical shape with the bottom of the handle housing space at its rear end. The width W of the resin grip 5 is also sufficiently larger than the thickness of the handle 20. Therefore, when the resin grip 5 is placed over the operating part 22 of the handle 20, the thickness of the handle 20 increases, making the handle 20 easier to operate.

[0029] The resin grip 5 has a small window 53 formed at a predetermined position on its inner surface 52. The small window 53 is positioned so that when the resin grip 5 is placed over the handle 20, the top of the retaining projection 28 formed on the inner surface of the handle 20 is exposed through the small window 53.

[0030] As described above, the retaining projection 28 rises diagonally outward from the rear of the handle 20 toward the front, with its tip dropping at approximately a right angle. Therefore, when inserting the handle 20 into the resin grip 5 from the rear end, the retaining projection 28 generates a small amount of resistance, but does not prevent the handle 20 from being inserted. However, when the handle 20 is fully inserted into the resin grip 5, the retaining projection 28 engages with the small window 53 of the resin grip 5. The retaining projection 28 then prevents the resin grip 5 from shifting toward the rear of the handle 20.

[0031] Therefore, when fitting the resin grip 5 onto the handle 20, there is no need to use an adhesive to prevent the resin grip 5 from shifting or coming off the handle 20, and the resin grip 5 covering the handle 20 will not shift during use. On the other hand, if the resin grip 5 becomes damaged during use, since the resin grip 5 is not glued to the handle 20, it has the advantage of being easy to replace.

[0032] Figure 8 is a front view of a handle 20 according to one embodiment of the present invention, and Figure 9 is a left side view of the handle 20, in which the configuration of the tip portion is shown in cross-section.

[0033] Referring to Figures 8 and 9, the handle 20 may, for example, be made of a carbon steel plate with a thickness of 3 mm. The handle 20 includes a connecting surface portion 21 provided at its tip and an operating portion 22 that curves gently backward from the connecting surface portion 21 and gradually narrows in width towards the rear end. The boundary 29 between the connecting surface portion 21 and the operating portion 22 is bent to create a step of, for example, 1.5 mm.

[0034] The connecting surface portion 21 has a shape in which the contour in a front view corresponds to the contour of the contact surface 18 (shown in Figure 10) of the connecting portion 16 of the head member 10. In Figure 8, the back surface of the connecting surface portion 21 is a mounting surface 211 that contacts the contact surface 18 opposite to it, and the surface opposite to the mounting surface 211 is the front surface 212.

[0035] The connecting surface portion 21 has a circular fixing hole 30 formed on its tip side when viewed from the front. Furthermore, the connecting surface portion 21 has an elongated hole 23 formed below the fixing hole 30, extending away from the fixing hole 30. The elongated hole 23 has an inner diameter of, for example, 1.6 mm on the side closer to the fixing hole 30 and an inner diameter of, for example, 1.5 mm on the side further away from the fixing hole 30. The inner diameter is wider on the side closer to the fixing hole 30 and narrows as it moves away from the fixing hole 30.

[0036] Referring to Figure 9, the fixing hole 30 formed in the connecting surface 21 is, for example, a round hole with a diameter of φ=4.2 mm, but has a screw head receiving portion 31 that is concave in a conical shape in the thickness direction of the connecting surface 212. The screw head receiving portion 31 engages with the screw head of the countersunk screw when inserting the countersunk screw for fixing from the surface 212 of the connecting surface 21, and centers the countersunk screw.

[0037] Figure 10 is an exploded perspective view illustrating how the handle 20 is connected to the head member 10.

[0038] Referring to Figure 10, the mounting surface 211 of the connecting surface portion 21 of the handle 20 is positioned opposite the contact surface 18 of the connecting portion 16 of one base material 11 of the head member 10. Then, the elongated hole 23 formed in the connecting surface portion 21 is fitted onto the cylindrical pin 17 erected on the contact surface 18. Since the inner diameter of the elongated hole 23 is larger on the side closer to the fixing hole 30, the process of fitting the cylindrical pin 17 into the elongated hole 23 can be easily performed by first fitting the side of the elongated hole 23 closer to the fixing hole 30 onto the cylindrical pin 17. Then, for example, a countersunk screw 24 with a shaft diameter of φ=3.0 mm is inserted into the fixing hole 30 formed in the connecting surface portion 21 from the surface 212 side, and the tip of the countersunk screw 24 is screwed into the screw hole 19 formed in the contact surface 18 of the connecting portion 16. As the countersunk screw 24 is screwed into the screw hole 19, the screw head 241 of the countersunk screw 24 is accommodated in the screw head receiving portion 31 of the fixing hole 30. As the screw head 241 of the countersunk screw 24 fits into the screw head receiving portion 31, the countersunk screw 24 is centered in the correct position and screwed into the screw hole 19 to be fixed in place.

[0039] Furthermore, when the countersunk screw 24 is centered in the correct position and screwed into the screw hole 19, the cylindrical pin 17 fitted into the elongated hole 23 displaces within the elongated hole 23 from a position with a wider inner diameter (closer to the fixing hole 30) to a position with a narrower inner diameter (further from the fixing hole 30), thereby fixing the mounting surface 211 of the connecting surface 21 to the contact surface 18 in the correct position.

[0040] This ensures that the handle 20 is securely and firmly connected to the connecting portion 16 of the head member 10 in the correct position. The other handle 20 is connected to the head member 10 in the same manner. Figure 11 is an enlarged cross-sectional view along line AA in Figure 1.

[0041] One base material 11 and the other base material 12 of the head member 10 are connected by a support shaft 13 so as to be able to open and close around the support shaft 13. The support shaft 13 may have a configuration as shown in Figure 11, which includes a center pin 131 fitted through from the one base material 11 to the other base material 12, and a center bolt 132 screw-fitted to the center of the center pin 131 from the other base material 12 side. In this configuration, a washer 134 and a spring washer 135 may be interposed on the center bolt 132.

[0042] This configuration allows the head member 10 to be disassembled into one base material 11 and the other base material 12, which has the advantage of making it easy to sharpen the blades of the nippers when they become worn.

[0043] In the embodiments of the present invention, the resin grips 5 are shown as two identical shapes, but as a modification, the two resin grips 5 may have different external shapes. For example, one of the resin grips 5 may be a resin grip 50 with the shape shown in Figure 12 when viewed from the front. The resin grip 50 has a finger ring 51 integrally provided on the rear end side of the resin grip 5. The remaining configuration is the same as that of the resin grip 5.

[0044] In the embodiment of the present invention, an example is shown in which the handles 20, 20 are relatively small relative to the head member 10, but the handles 20, 20 may be made larger with a longer length.

[0045] In another embodiment, as shown in Figure 13, the nippers may be configured such that asymmetrical handles 20, 20x are connected to the head member 10. Alternatively, as shown in Figure 14, the nippers may be configured such that asymmetrical handles 20, 20y are connected to the head member 10.

[0046] The present invention is not limited to the embodiments described above. Various modifications are possible within the scope of the claims. [Explanation of symbols]

[0047] 1. Nippers 2 wire springs 5.50 Resin Grip 10 Head component 11 One side of the base material 12 Other base material 13 Spindle 14 blades 15 Blade 16 Connecting part 17 Cylinder pins 18 Contact surface 19 screw holes 20 handles 21 Connecting surface part 22 Control section 23 long hole 24 countersunk screws 26 Rear recess 27 Anterior recess 28 Retaining protrusion 29 Boundary 30 fixing hole 31 Screw head receiving part 51 Entrance 52 Inner surface 53 Small window 131 Center Pin 132 Center bolt 134 Washer 135 Spring Washer 211 Mounting surface 212 Surface

Claims

1. A pair of nippers comprising a head member having a blade and an operating member for operating the opening and closing of the head member, The head member includes a pair of base materials, one base material and the other base material, with the front end of each base material being a blade portion where a blade is formed, and a connecting portion being provided at the rear end of each base material, and the two base materials are connected so as to be able to open and close around a pivot shaft. The nippers are characterized in that the operating member has a pair of one handle and the other handle, the one handle is connected to the connecting portion of the one base material, and the other handle is connected to the connecting portion of the other base material.

2. The connecting portion is provided with a contact surface, a screw hole drilled perpendicularly from the contact surface at a predetermined position on the contact surface, and a cylindrical pin erected on the contact surface at a predetermined distance from the screw hole. A connecting surface is provided at the tip end of each of the aforementioned one handle and the other handle. The connecting surface portion has a mounting surface facing the contact surface and a surface opposite to the mounting surface. The connecting surface portion has a fixing hole for mounting a countersunk screw and an elongated hole for receiving the cylindrical pin. The nipper according to claim 1, wherein the fixing hole has a screw head receiving portion that is conically recessed in the thickness direction of the connecting surface portion from the surface, and the elongated hole has an inner diameter that is sandwiched in a direction away from the fixing hole.

3. The aforementioned one handle and the other handle each have an elongated shape extending from the front end to the rear end, and a cylindrical resin grip can be attached to the rear end. Each of the aforementioned handles has a retaining projection that protrudes outward from the handle surface in the middle of its longitudinal shape, and the retaining projection has a shape that rises diagonally from the rear to the front of the handle, with its tip dropping down at approximately a right angle. The nippers according to claim 1 or 2, wherein the resin grip has a window formed in a position corresponding to the retaining projection when attached to the handle, which exposes the retaining projection.

Images