Folding knife capable of preventing knife back from tilting

Abstract

The utility model relates to the technical field of cutters, in particular to a folding cutter capable of preventing a cutter back from tilting, which comprises a blade, a cutter handle and the cutter back mounted on the cutter handle, the blade is rotatably connected with the cutter handle through a hinge shaft, the cutter back is embedded into the inner side of the upper end of the cutter handle, a chamfering portion is arranged at the upper end of the blade, and the cutter handle is provided with a groove. A chamfering inclined plane is arranged on the chamfering part, a convex angle part is arranged on the knife back, and a convex angle inclined plane matched with the chamfering inclined plane is arranged on the convex angle part. According to the utility model, the chamfering inclined surface is arranged on the chamfering part and is matched with the convex angle inclined surface on the convex angle part, so that part of upwarp force is eliminated when the blade is subjected to upward force, the blade back is prevented from upwarp, the stability of the blade and the blade back is kept, and the overall use stability is better.

Description

Technical Field

[0001] The utility model relates to the technical field of knives, in particular to a folding knife capable of preventing a knife back from tilting. Background Art

[0002] Most folding knives are composed of a blade and a handle with a certain cavity. The blade is movably connected to the handle through a hinge shaft. The blade can be folded into the cavity of the handle by hand, or the blade can be unfolded outward from the handle.

[0003] After searching, the Chinese utility model patent with patent application number CN202321058377.3 discloses a folding knife with high safety, including a blade, a handle and a blade back mounted on the handle, the blade is rotatably connected to the handle via a hinge shaft, the blade back is embedded in the inner side of the upper end of the handle, the upper end of the blade is provided with a first arc portion, the first arc portion is provided with a first arc surface, the left side of the blade back is provided with a second arc portion adapted to the first arc portion, and the second arc portion is provided with a second arc surface adapted to the first arc surface. The utility model avoids the phenomenon of sharp angles on the contact surface of the back of the blade after the blade is folded by providing a first arc surface on the first arc portion on the blade and a second arc surface adapted to the first arc surface on the second arc portion on the blade back, thereby improving the safety of the knife during use, having high safety and good user experience.

[0004] However, the compensating contact surface between the blade and the spine in existing folding knives is an arc surface. When the blade is subjected to upward force, the upward force is applied to the spine spring through the blade back contact surface, causing the spine spring to warp upward, resulting in poor overall stability in use. Utility Model Content

[0005] The technical problem to be solved by the present invention is that, in response to the above-mentioned defects of the prior art, a folding knife is provided which prevents the blade back from tilting up. By arranging a chamfered slope on the chamfered portion to cooperate with the convex angle slope on the convex angle portion, the blade can eliminate part of the upward force when subjected to an upward force, thereby avoiding the tilting of the blade back, maintaining the stability of the blade and the blade back, and improving the overall stability of use.

[0006] In order to solve the above technical problems, the technical solution of the utility model is:

[0007] A folding knife for preventing a blade back from curling up comprises a blade, a handle and a blade back mounted on the handle, wherein the blade is rotatably connected to the handle via a hinge shaft, the blade back is embedded in the inner side of the upper end of the handle, the upper end of the blade is provided with a chamfered portion, the chamfered portion is provided with a chamfered inclined surface, the blade back is provided with a convex corner portion, and the convex corner portion is provided with a convex inclined surface adapted to the chamfered inclined surface.

[0008] Preferably, the upper end of the chamfered portion is flush with the upper end of the convex corner portion.

[0009] Preferably, a blade back mounting groove is provided at the upper end of the knife handle, and the blade back is embedded in the blade back mounting groove.

[0010] Preferably, a convex point A is provided on the chamfered inclined surface, and a concave point B adapted to the convex point A is provided on the convex inclined surface.

[0011] Preferably, both the knife handle and the blade are provided with hinge shaft through holes, and the hinge shaft is installed in the hinge shaft through holes.

[0012] Preferably, a blade mounting groove adapted to the blade is provided at the bottom of the knife handle, and the blade is inserted into the blade mounting groove when closed.

[0013] By adopting the above technical solution, the utility model provides a folding knife that prevents the blade back from curling up, which has the following beneficial effects: the blade in the folding knife is rotatably connected to the handle through a hinge shaft, the blade back is embedded in the inner side of the upper end of the handle, the upper end of the blade is provided with a chamfered portion, the chamfered portion is provided with a chamfered slope, the blade back is provided with a convex corner portion, the convex corner portion is provided with a convex angle slope that matches the chamfered slope, and the traditional arc surface is improved into a straight slope by providing a chamfered slope on the chamfered portion to cooperate with the convex angle slope on the convex corner portion. The advantage of the slope is that the structure is more stable, so that the blade can eliminate part of the upward force when subjected to upward force, thereby avoiding the upward curling of the blade back, maintaining the stability of the blade and the blade back, and the overall stability of use is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is an exploded view of the utility model;

[0015] Figure 2 This is a schematic diagram of the open state of the utility model;

[0016] Figure 3 This is a schematic diagram of the closed state of the utility model;

[0017] In the figure, 1-blade, 2-handle, 3-blade back, 4-hinge axis, 5-chamfered portion, 6-chamfered inclined surface, 7-convex corner portion, 8-convex inclined surface, 9-blade back mounting groove, 10-convex point A, 11-concave point B. DETAILED DESCRIPTION

[0018] The following further describes specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the descriptions of these embodiments are intended to aid understanding of the present invention and do not constitute limitations on the present invention. Furthermore, the technical features involved in the various embodiments of the present invention described below may be combined with one another as long as they do not conflict with one another.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0021] like Figure 1-3 As shown, the folding knife for preventing the blade back from tilting includes a blade 1, a handle 2, and a blade back 3 mounted on the handle 2. The blade 1 is rotatably connected to the handle 2 via a hinge shaft 4. The blade back 3 is embedded in the inner side of the upper end of the handle 2. The upper end of the blade 1 is provided with a chamfered portion 5, which is provided with a chamfered slope 6. The blade back 3 is provided with a convex corner portion 7, which is provided with a convex slope 8 that matches the chamfered slope 6. It is understandable that the blade 1, handle 2, and blade back 3 can all be made of stainless steel or the like.

[0022] Specifically, the upper end of the chamfered portion 5 is flush with the upper end of the convex corner portion 7; the upper end of the handle 2 is provided with a blade back mounting groove 9, and the blade back 3 is embedded and mounted in the blade back mounting groove 9; the chamfered inclined surface 6 is provided with a raised point A 10, and the convex inclined surface 8 is provided with a recessed point B 11 that matches the raised point A 10; the handle 2 and the blade 1 are both provided with a hinge shaft through-hole, and the hinge shaft 4 is mounted in the hinge shaft through-hole; the bottom of the handle 2 is provided with a blade mounting groove that matches the blade 1, and the blade 1 is inserted into the blade mounting groove when closed. It can be understood that when the blade 1 is in use, when an upward force is applied to the blade back 3 through the contact surface of the blade back 3, the raised point A 10 and the recessed point B 11 will be stuck, preventing the blade 1 and the blade back 3 from tilting upward.

[0023] It can be understood that the utility model has a reasonable design and a unique structure. By arranging a chamfered bevel 6 on the chamfered portion 5 to cooperate with the convex angle bevel 8 on the convex angle portion 7, the traditional arc surface is improved into a straight bevel. The advantage of the bevel is that the structure is more stable, so that the blade 1 can eliminate part of the upward force when subjected to an upward force, thereby avoiding the upward warping of the blade back 3, maintaining the stability of the blade 1 and the blade back 3, and improving the overall stability of use.

[0024] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It is apparent to those skilled in the art that various changes, modifications, substitutions, and variations to these embodiments may be made without departing from the principles and spirit of the present invention, and these changes and modifications still fall within the scope of protection of the present invention.

Claims

1. A folding knife for preventing a blade back from tilting, comprising a blade, a handle, and a blade back mounted on the handle, wherein the blade is rotatably connected to the handle via a hinge shaft, and the blade back is embedded in the inner side of the upper end of the handle, characterized in that: The upper end of the blade is provided with a chamfered portion, the chamfered portion is provided with a chamfered inclined surface, the blade back is provided with a convex corner portion, the convex corner portion is provided with a convex inclined surface matched with the chamfered inclined surface.

2. The folding knife for preventing blade back from tilting according to claim 1, characterized in that: An upper end of the chamfered portion is flush with an upper end of the convex corner portion.

3. The folding knife for preventing blade back from tilting according to claim 1, characterized in that: A blade back mounting groove is provided at the upper end of the knife handle, and the blade back is embedded and mounted in the blade back mounting groove.

4. The folding knife for preventing blade back from tilting according to claim 1, characterized in that: A convex point A is provided on the chamfered inclined surface, and a concave point B adapted to the convex point A is provided on the convex inclined surface.

5. The folding knife for preventing blade back from tilting according to claim 1, characterized in that: The knife handle and the blade are both provided with hinge shaft through holes, and the hinge shaft is installed in the hinge shaft through holes.

6. The folding knife for preventing blade back from tilting according to claim 1, characterized in that: The bottom of the knife handle is provided with a blade mounting groove adapted to the blade, and the blade is inserted into the blade mounting groove when closed.

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