Cutting knife with replaceable knife head

Abstract

The utility model discloses a cutting knife with a replaceable knife head. The cutting knife aims to solve the problems that in the prior art, an integrated neon lamp strip cutting knife is inconvenient to purchase and replace by a user, and cost is increased. Comprising a handle, a tool apron is arranged on the front portion of the handle and comprises a nut matching portion and a tool bit matching portion, the tool bit matching portion is used for being matched with the tail structure of a tool bit, threads are arranged on the peripheral face of the front portion of the handle and matched with a nut, and the front portion of the nut is of an inward closing structure, matched with the nut matching portion and used for clamping the tool bit when the nut is tightened. The tool bit clamping device has the advantages of being simple in structure, easy to disassemble and assemble and capable of well clamping a tool bit, reducing the use cost of a user to a certain extent, and improving the use convenience of the user.

Description

Technical Field

[0001] The utility model relates to the technical field of hardware tools, in particular to a cutting knife with a replaceable cutter head. Background Art

[0002] The handle and the blade of the existing neon light strip cutter are mostly integrated structures. In actual use, once the blade is worn, blunted or even damaged, the user can only discard the entire cutter and buy a new one, which brings inconvenience to users who need to use the cutter frequently for a long time and increases costs. Utility Model Content

[0003] The utility model aims to provide a cutting knife with a replaceable cutter head, so as to solve the problem that the integrated cutting knife in the prior art increases the replacement cost for users.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A cutting knife with a replaceable blade is designed, comprising a handle, a blade seat is arranged at the front of the handle, the blade seat comprises a nut matching part and a blade matching part, the blade matching part is used to adapt to the blade tail structure, a thread is arranged on the outer peripheral surface of the front part of the handle, which matches with the nut, and the front part of the nut is an inward closing structure, which matches with the nut matching part and is used to clamp the blade when tightening the nut.

[0006] Preferably, a clamping piece is also included, which includes a cutter head fitting side and a nut fitting side, the cutter head fitting side is used to fit with the side of the cutter head tail facing away from the cutter seat, and when the nut is tightened, the closing structure pushes the clamping piece closer to the cutter seat to clamp the cutter head.

[0007] Preferably, the tool head mating part is an outward convex structure, including at least one curved surface, which is connected by two straight surfaces. The tool seat and the tool head mating side are matched with a clamping member with a curved surface or an L-shaped surface, which is used to clamp the tail of the tool head, and the tail of the tool head is a curved piece or an L-shaped piece.

[0008] Preferably, the tool head matching portion includes three arc surfaces, the three arc surfaces are connected by two straight surfaces at intervals, and the three arc surfaces are extended and connected to form a complete arc surface.

[0009] Preferably, the tool head matching portion is a curved surface, the tool head tail structure is a curved sheet, and the tool head fitting side is a curved surface for clamping the curved sheet.

[0010] Preferably, the tool head matching portion is an L-shaped surface, the tool head tail structure is an L-shaped sheet, and the tool head fitting side is an L-shaped surface for clamping the L-shaped sheet.

[0011] Preferably, the tool head matching portion is an outer convex surface, and the tool head fitting side is an inner concave surface.

[0012] Preferably, the tool head matching portion is an inner concave surface, and the tool head fitting side is an outer convex surface.

[0013] Preferably, the tool head matching portion is a semicircular arc surface, and the tool head fitting side is a semicircular arc surface.

[0014] Preferably, the tool holder is made of elastic material, and is provided with a tool bit clamping groove, the tool bit clamping groove constitutes a tool bit matching part, and the outer peripheral surface of the tool holder constitutes a nut matching part. When the nut is tightened, the closing structure causes the tool bit clamping groove to close and thus clamp the tool bit.

[0015] Preferably, there is a spacing between the tool head matching portion of the tool holder and the nut for accommodating the tail of the tool head. When the nut is tightened, the closing structure pushes the tool head close to the tool head matching portion, thereby clamping the tool head.

[0016] Preferably, the outer peripheral surface of the nut is provided with knurling, the handle is provided with an anti-rolling structure, or the outer peripheral surface of the nut is processed with milling flatness.

[0017] Compared with the prior art, the beneficial technical effect of the utility model is that due to the design of the knife seat and the nut, when the cutter head is damaged and needs to be replaced, the user only needs to unscrew the nut, take out the old cutter head from the knife seat, and then install the new cutter head on the knife seat, and finally screw on the nut to complete the replacement of the cutter head, which is easy to operate. In addition, the cutter head matching part of the knife seat is adapted to the tail structure of the cutter head, ensuring that the tail of the cutter head is well supported. When tightening the nut, the closing structure of the nut cooperates with the knife seat to clamp the cutter head, achieving a good clamping effect. In short, the cutting knife with a replaceable cutter head has a simple structure, is easy to disassemble and assemble, and can clamp the cutter head well, which reduces the user's use cost to a certain extent and improves the user's convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of the first implementation method of Example 1 of the utility model;

[0019] Figure 2 This is a schematic diagram of the overall structure of the second implementation method of Example 1 of the utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the handle in Embodiment 1 of the present utility model;

[0021] Figure 4 for Figure 3 Top view of the middle knife holder;

[0022] Figure 5 This is a schematic diagram of the structure of the semicircular arc clamping member in the utility model;

[0023] Figure 6 This is a schematic diagram of the structure of the L-shaped clamping member in the utility model;

[0024] Figure 7 It is a structural schematic diagram of the nut in the utility model;

[0025] Figure 8 for Figure 7 A cross-sectional view of a

[0026] Fig. 9 This is a schematic diagram of the overall structure of the first implementation method of Example 1 of the utility model in an application scenario;

[0027] Fig.10 This is a schematic diagram of the overall structure of the second implementation method of Example 1 of the utility model in an application scenario;

[0028] Fig.11 This is a schematic diagram of the overall structure of Embodiment 2 of the present utility model;

[0029] Fig.12 This is a schematic diagram of the structure of the handle in Embodiment 2 of the present utility model;

[0030] Fig.13 for Fig.12 Top view of the middle knife holder;

[0031] Fig.14 This is a schematic diagram of the overall structure of Example 2 of the utility model in an application scenario;

[0032] Fig.15 This is a schematic diagram of the overall structure of Embodiment 3 of the present utility model;

[0033] Fig.16 This is a schematic diagram of the structure of the handle in Embodiment 3 of the present utility model;

[0034] Fig.17 for Fig.16 Top view of the middle knife holder;

[0035] Fig.18 It is a schematic diagram of the overall structure of Example 3 of the utility model in an application scenario.

[0036] In the figure, 1-handle, 2-knife holder, 21-universal knife holder, 211-nut fitting part of universal knife holder, 212-tool head fitting part of universal knife holder, 22-semicircular knife holder, 221-nut fitting part of semicircular knife holder, 222-tool head fitting part of semicircular knife holder, 23-L-type knife holder, 231-nut fitting part of L-type knife holder, 232-tool head fitting part of L-type knife holder, 3-clamping piece, 31-semicircular clamping piece, 311-nut fitting side of semicircular clamping piece, 312-tool head fitting side of semicircular clamping piece, 32-L-type clamping piece, 321-nut fitting side of L-type clamping piece, 322-tool head fitting side of L-type clamping piece, 4-nut, 41-closing structure, 5-semicircular blade, 6-L-type blade. DETAILED DESCRIPTION

[0037] The specific implementation of the present invention is described below in conjunction with the accompanying drawings and embodiments, but the following embodiments are only used to illustrate the present invention in detail and do not limit the scope of the present invention in any way. The equipment parts, structures, etc. involved in the following embodiments are all conventional commercially available products unless otherwise specified.

[0038] Embodiment 1: A cutting knife with a replaceable blade, see Figure 1-10 , including a handle 1, a knife seat 2 is arranged at the front part of the handle 1, the knife seat 2 includes a nut matching part and a cutter head matching part, the cutter head matching part is adapted to the structure of the tail part of the cutter head, a thread is arranged on the outer peripheral surface of the front part of the handle 1, matching with the nut 4, the front part of the nut 4 is an inward closing structure, matching with the nut matching part, and is used to clamp the cutter head when tightening the nut 4, the cutting knife with replaceable cutter head also includes a clamping member 3, the clamping member 3 includes a cutter head fitting side and a nut matching side, the cutter head fitting side is fitted with the side of the tail part of the cutter head facing away from the knife seat, and when the nut 4 is tightened, the closing structure 41 pushes the clamping member 3 to approach the knife seat 2 to clamp the cutter head.

[0039] Specifically, Figure 3 and Figure 4 As shown, the tool holder 2 is a universal tool holder 21, including a nut mating portion 211 of the universal tool holder and a cutter head mating portion 212 of the universal tool holder, wherein the cutter head mating portion 212 of the universal tool holder is an outward convex structure, including three arc surfaces, and the three arc surfaces are connected by two straight lines, and the three arc surfaces are extended to form a complete arc surface, and the tool holder 2 is matched with a clamping member 3 whose cutter head mating side is an arc surface or whose cutter head mating side is an L-shaped surface, and is used to clamp the tail of the cutter head, and the tail of the cutter head is an arc-shaped piece or an L-shaped piece. By the three arc surfaces being tightly matched with the arc-shaped piece, the contact area between the cutter head mating portion and the arc-shaped piece is increased, and the support and clamping degree of the arc-shaped piece are improved. In other embodiments, the cutter head mating portion of the universal tool holder includes at least one arc surface, specifically one, two or more than three. As Figure 5As shown, the clamping member 3 is a semicircular arc clamping member 31, including a nut mating side 311 of the semicircular arc clamping member and a tool head mating side 312 of the semicircular arc clamping member. Figure 7 and Figure 8 As shown, the rear portion of the nut 4 is an internal thread structure, and the front portion is an internal closing structure 41.

[0040] Furthermore, the outer circumference of the nut 4 is knurled to prevent slipping and increase friction, making it easier for the user to tighten the nut 4. In addition, the handle 1 is provided with an anti-roll structure. Specifically, two protrusions are arranged at intervals on the outer circumference of the handle 1 to prevent the handle 1 from rolling on the horizontal plane. Alternatively, the outer circumference of the nut 4 is milled flat, and the milled flat structure not only makes it easier for the user to tighten the nut 4, but also prevents the handle 1 from rolling on the horizontal plane.

[0041] When the cutter with replaceable cutter head is used, Fig. 9 As shown, first remove the old cutter head, at this time the handle 1, the semicircular arc clamping piece 31 and the nut 4 are in a separate state, place the new semicircular arc blade 5 on the universal cutter seat 21, so that the concave surface of the semicircular arc blade 5 fits with the three arc surfaces of the cutter head matching part 212 of the universal cutter seat, then place the semicircular arc clamping piece 31, so that the cutter head fitting side 312 of the semicircular arc clamping piece fits with the convex surface of the semicircular arc blade 5, and finally put on the nut 4 and tighten it. In the process of tightening the nut, the closing structure 41 of the nut 4 pushes the semicircular arc clamping piece 31 to approach the universal cutter seat 21 to clamp the semicircular arc blade 5. The utility model utilizes the closing structure of the nut to cooperate with the clamping piece and the cutter seat, can better clamp the cutter head, prevent the cutter head from loosening and falling, is convenient for users to use, and has a simple structure and is easy to operate, which is convenient for users to replace the cutter head and saves costs for users.

[0042] In other embodiments, Figure 6 and Fig.10 As shown, the semicircular arc clamping member 31 in the first embodiment can be replaced with an L-shaped clamping member 32, which cooperates with the universal tool holder 21 and the nut 4 to clamp the L-shaped blade 6. In this embodiment, the concave surface of the L-shaped blade fits with the two straight surfaces in the tool head matching portion 212 of the universal tool holder, the convex surface fits with the tool head matching side 322 of the L-shaped clamping member, and the nut matching side 321 of the L-shaped clamping member matches with the closing structure 41 of the nut 4, and the remaining structure is the same as the first embodiment.

[0043] Embodiment 2: A cutting knife with a replaceable blade, see Figure 11-14 , which is different from Example 1 (the rest of the structures not described are the same as Example 1), in this embodiment, the knife seat 2 is a semicircular knife seat 22, which cooperates with the semicircular clamping piece 31 and the nut 4 to clamp the semicircular blade 5.

[0044] Specifically, Fig.12 and Fig.13 As shown, the semicircular arc knife seat 22 includes a nut mating portion 221 of the semicircular arc knife seat and a cutter head mating portion 222 of the semicircular arc knife seat, wherein the cutter head mating portion 222 of the semicircular arc knife seat is an outer convex surface, and the cutter head fitting side 312 of the semicircular arc clamping piece is an inner concave surface, specifically a semicircular arc surface. The cutter head mating portion 222 is an outer convex surface, so that the volume of the knife seat 2 as a fixed structure is larger than that of the clamping piece 3 as a movable part, thereby increasing the stability of the knife seat 2. In other embodiments, the cutter head mating portion of the semicircular arc knife seat may be an inner concave structure, and correspondingly, the cutter head fitting side of the semicircular arc clamping piece is an outer convex structure. In other embodiments, the cutter head mating portion of the knife seat may be an arc, and correspondingly, the cutter head fitting portion of the clamping piece is also an arc, for clamping the arc blade.

[0045] When the cutter with replaceable cutter head is used, Fig.14 As shown, first remove the old cutter head. At this time, the handle 1, the semicircular arc clamping piece 31 and the nut 4 are in a separate state. Place the new semicircular arc blade 5 on the semicircular arc tool holder 22, so that the concave surface of the semicircular arc blade 5 fits with the semicircular arc surface of the cutter head matching part 222 of the semicircular arc tool holder. Then place the semicircular arc clamping piece 31, so that the cutter head fitting side 312 of the semicircular arc clamping piece fits with the convex surface of the semicircular arc blade 5. Finally, put on the nut 4 and tighten it. In the process of tightening the nut, the closing structure 41 of the nut 4 pushes the semicircular arc clamping piece 31 to approach the semicircular arc tool holder 22, thereby clamping the semicircular arc blade 5.

[0046] Embodiment 3: A cutting knife with a replaceable blade, see Figure 15-18 , which is different from Example 1 (the rest of the structures not described are the same as Example 1), in this embodiment, the knife seat 2 is an L-shaped knife seat 23, which cooperates with the L-shaped clamping piece 32 and the nut 4 to clamp the L-shaped blade 6.

[0047] Specifically, Fig.16 and Fig.17 As shown, the L-shaped tool holder 23 includes a nut mating portion 231 of the L-shaped tool holder and a tool head mating portion 232 of the L-shaped tool holder, wherein the tool head mating portion 232 of the L-shaped tool holder is an outward convex structure, specifically an L-shaped surface. In other embodiments, the tool head mating portion of the L-shaped tool holder may be an inward concave structure, and accordingly, the tool head mating side of the L-shaped clamping piece is an outward convex structure.

[0048] When the cutter with replaceable cutter head is used, Fig.18As shown, first remove the old cutter head. At this time, the handle 1, the L-shaped clamping piece 32 and the nut 4 are in a separate state. Place the new L-shaped blade 6 on the L-shaped tool holder 23, so that the concave surface of the L-shaped blade 6 fits with the L-shaped surface of the cutter head matching part 232 of the L-shaped tool holder. Then place the L-shaped clamping piece 32, so that the cutter head fitting side 322 of the L-shaped clamping piece fits with the convex surface of the L-shaped blade 6. Finally, put on the nut 4 and tighten it. During the process of tightening the nut, the closing structure 41 of the nut 4 pushes the L-shaped clamping piece 32 to approach the L-shaped tool holder 23, thereby clamping the L-shaped blade 6.

[0049] Embodiment 4: A cutting knife with a replaceable blade, which is different from Embodiment 1 (the rest of the structures not described are the same as Embodiment 1) in that the clamping member 3 is not designed in this embodiment. Specifically, the blade holder 2 is made of elastic material, and a blade clamping groove is provided on the blade holder 2, which constitutes a blade matching portion, and the outer peripheral surface of the blade holder 2 constitutes a nut matching portion. When the nut 4 is tightened, the closing structure 41 closes the blade clamping groove to clamp the blade.

[0050] Embodiment 5: A cutting knife with a replaceable blade, which is different from Embodiment 1 (the rest of the structures not described are the same as Embodiment 1) in that the clamping member 3 is not designed in this embodiment. Specifically, there is a gap between the blade matching portion of the blade holder 2 and the nut 4 for accommodating the tail of the blade, and when the nut 4 is tightened, the closing structure 41 directly contacts the side of the blade tail facing away from the blade holder, and pushes the blade to be close to the blade matching portion, thereby clamping the blade.

[0051] The utility model is described in detail above with reference to the accompanying drawings and embodiments. However, those skilled in the art will appreciate that, without departing from the spirit of the utility model, the specific parameters in the above embodiments may be changed to form a plurality of specific embodiments, which are all within the common variation range of the utility model and will not be described in detail here.

Claims

1. A cutting knife with a replaceable blade, characterized in that: It includes a handle, a knife seat is arranged at the front part of the handle, the knife seat includes a nut matching part and a knife head matching part, the knife head matching part is used to adapt to the knife head tail structure, the front part of the handle is provided with a thread on the outer peripheral surface, which matches with the nut, and the front part of the nut is an inward closing structure, which matches with the nut matching part and is used to clamp the knife head when tightening the nut.

2. The cutting knife with replaceable blade according to claim 1, characterized in that: It also includes a clamping piece, which includes a cutter head fitting side and a nut fitting side. The cutter head fitting side is used to fit with the side of the tail of the cutter head facing away from the cutter seat. When the nut is tightened, the closing structure pushes the clamping piece toward the cutter seat to clamp the cutter head.

3. The cutting knife with replaceable blade according to claim 2, characterized in that: The tool head mating part is an outward convex structure, including at least one curved surface, which is connected by two straight surfaces. The tool seat and the tool head mating side are a curved surface or a clamping member with an L-shaped surface, which is used to clamp the tail of the tool head, and the tail of the tool head is a curved piece or an L-shaped piece.

4. The cutting knife with replaceable blade according to claim 3, characterized in that: The tool head matching portion includes three arc surfaces, the three arc surfaces are connected by two straight surfaces at intervals, and the three arc surfaces are extended and connected to form a complete arc surface.

5. The cutting knife with replaceable blade according to claim 2, characterized in that: The tool head matching part is a curved surface, the tool head tail structure is a curved sheet, and the tool head fitting side is a curved surface for clamping the curved sheet.

6. The cutting knife with replaceable blade according to claim 2, characterized in that: The tool head matching part is an L-shaped surface, the tool head tail structure is an L-shaped sheet, and the tool head fitting side is an L-shaped surface for clamping the L-shaped sheet.

7. The cutting knife with replaceable blade according to claim 5 or 6, characterized in that: The tool head matching portion is an outer convex surface, and the tool head fitting side is an inner concave surface.

8. The cutting knife with replaceable blade according to claim 5 or 6, characterized in that: The tool head matching portion is an inner concave surface, and the tool head fitting side is an outer convex surface.

9. The cutting knife with replaceable blade according to claim 5, characterized in that: The tool head matching portion is a semicircular arc surface, and the tool head fitting side is a semicircular arc surface.

10. The cutting knife with replaceable blade according to claim 1, characterized in that: The tool holder is made of elastic material and is provided with a tool head clamping groove, which constitutes a tool head matching portion, and the outer peripheral surface of the tool holder constitutes a nut matching portion. When the nut is tightened, the closing structure causes the tool head clamping groove to close and thus clamp the tool head.

11. The cutting knife with replaceable blade according to claim 1, characterized in that: There is a distance between the tool head matching part of the tool holder and the nut for accommodating the tail of the tool head. When the nut is tightened, the closing structure pushes the tool head close to the tool head matching part, thereby clamping the tool head.

12. The cutting knife with replaceable blade according to claim 1, characterized in that: The outer peripheral surface of the nut is provided with knurling, and the handle is provided with an anti-rolling structure; or the outer peripheral surface of the nut is processed with milling flatness.

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