A folding knife

Abstract

The present invention discloses a folding knife, which includes a knife handle, a blade and a boosting mechanism. The blade is hinged to the knife handle by a first connecting pin, and the blade can rotate relative to the knife handle to open and fold. The boosting mechanism includes a first transmission rod, a second transmission rod and a spring arm. The front end of the first transmission rod is hinged to the blade by a second connecting pin. The middle part of the second transmission rod is hinged to the knife handle, and one end of the second transmission rod is hinged to the rear end of the first transmission rod by a third connecting pin, and the other end is connected to the free end of the spring arm. When the blade is operated in the folding state in the opening direction, before the center point of the second connecting pin passes through the center line connecting the first connecting pin and the third connecting pin, the boosting mechanism provides a boosting effect on the blade in the folding direction to prevent the blade from accidentally opening in the folding state; and after the center point of the second connecting pin passes through the center line connecting the first connecting pin and the third connecting pin, the boosting mechanism provides a boosting effect on the blade in the opening direction, and the blade is convenient and labor-saving to open.

Description

Technical Field

[0001] The invention belongs to the technical field of knives, and in particular relates to a folding knife. Background Art

[0002] Existing folding knives generally include a handle and a blade hinged to the handle. The blade can be rotated relative to the handle to open and fold. In this way, when the knife is not in use, the blade can be folded up, which is safe to use and convenient to carry.

[0003] Existing folding knives are designed for safety, and in order to prevent the blade from accidentally opening when folded, a mechanism is generally provided to maintain the folded state of the blade. In a traditional folding knife, a back spring is provided on the back of the handle body to press against the tail of the blade, and the tail of the blade is provided with a circular arc surface and a pressing plane. When the blade is folded, the back spring contacts the pressing plane. When the blade is opened, it is necessary to overcome the resistance applied by the back spring to the pressing plane. The blade can only continue to open smoothly when the back spring and the circular arc surface are pressed against each other. In this structure, the elastic force applied by the back spring to the pressing plane is very large. To open the blade, it is necessary to pinch the blade with your fingers and apply a large force in the opening direction to open the blade smoothly. The operation of opening the blade is relatively laborious, and when the blade is rotated to the circular arc surface and pressed against the back spring, the back spring cannot provide auxiliary assistance to the opening of the blade, and the blade is difficult to open. Summary of the invention

[0004] The purpose of the present invention is to solve at least one of the above-mentioned technical problems, and to provide a folding knife which is safe, labor-saving and can assist the blade in the opening and folding directions.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a folding knife, including a handle and a blade, the handle is provided with a blade groove, the blade is hinged at the end position in the blade groove by a first connecting pin, the blade can rotate around the first connecting pin relative to the blade groove to open and fold in the blade groove, the above-mentioned folding knife also includes a power-assisting mechanism that can assist the blade in the opening and folding directions, the power-assisting mechanism includes a first transmission rod, a second transmission rod and an elastic arm, the front end of the first transmission rod is hinged to the blade by the second connecting pin, the middle part of the second transmission rod is hinged to the handle, and one end of the second transmission rod is hinged to the rear end of the first transmission rod by a third connecting pin, and the other end is connected to the free end of the elastic arm, when the blade is operated in the opening direction in the folded state, the center point of the second connecting pin is before passing through the center line connecting the first connecting pin and the third connecting pin, the power-assisting mechanism provides a power-assisting effect on the blade in the folding direction, and the center point of the second connecting pin is after passing through the center line connecting the first connecting pin and the third connecting pin, the power-assisting mechanism provides a power-assisting effect on the blade in the opening direction.

[0006] In the above solution, before the blade is opened, the second transmission rod of the boosting mechanism presses against the free end of the elastic arm to keep the elastic arm in elastic deformation, and the elastic arm provides the power for the boosting mechanism to fold or open the blade. When the blade is operated in the opening direction from the folded state, before the center point of the second connecting pin passes through the center line connecting the first connecting pin and the third connecting pin, the elastic arm provides the power for the boosting mechanism to push the blade to rotate counterclockwise, that is, it boosts the blade to rotate in the folding direction, which is equivalent to providing a reverse force to the blade opening direction. This can prevent the blade from automatically opening in the folded state and make the blade folding more stable. Moreover, during this process, through the power transmitted by the boosting mechanism to the elastic arm, when the blade is opened, what needs to be overcome is the component force of the power provided by the elastic arm, and its strength is relatively small. The force applied by the finger pinching the blade in the opening direction does not need to be very large to smoothly open the blade, and the blade opening operation is relatively labor-saving; after the center point of the second connecting pin passes through the center line connecting the first connecting pin and the third connecting pin, at this time, the elastic arm provides the power for the boosting mechanism to push the blade to rotate clockwise, that is, it boosts the blade to rotate in the opening direction, and the blade can automatically continue to open without the user continuing to apply the opening power to the blade, and the blade opening is labor-saving and convenient.

[0007] Further, a guide groove is provided on the side surface of the above-mentioned knife handle. The first transmission rod is located in the guide groove and can rotate relative to the inner side of the guide groove. The guide groove has a starting point and an ending point. When the blade rotates to the folded state, the front end of the first transmission rod rotates to the starting point position of the guide groove. In this way, the placement of the first transmission rod can be facilitated, and the space of the handle body can be fully utilized. Moreover, when the blade rotates to the opened state, the front end of the first transmission rod rotates to the ending point position of the guide groove, which can play a positioning role in the rotation of the blade and prevent the blade from rotating excessively in the opening and folding directions.

[0008] Further, the above-mentioned elastic arm is formed by directly opening a notch on one side surface of the knife handle corresponding to the position of the guide groove, which simplifies the manufacturing process and saves materials.

[0009] Further, one end of the above-mentioned second transmission rod corresponding to the connection with the elastic arm is in contact connection with the free end of the elastic arm through a convex column, which avoids the free end of the elastic arm restricting the rotation of the second transmission rod.

[0010] The beneficial effects of the present invention are as follows. The assisting mechanism can provide assistance to the blade in the opening and folding directions. When the blade is opened from the folded state, the blade needs to overcome the assistance provided by the assisting mechanism in the folding direction, and after the blade rotates to the critical angle in the opening direction, the blade can continue to rotate smoothly to be opened. In this way, the force required to open the blade is relatively smaller than that of traditional folding knives, and the angle that the blade needs to rotate is larger. This critical angle can reach 30 to 40 degrees, and there will be no problem that the blade ejects and opens when it just opens a small angle, such as about 10 to 15 degrees, from the folded state, so the safety is better. When the blade is opened beyond the critical angle, the blade can be automatically opened under the opening assistance provided by the assisting mechanism, and the opening of the blade is more convenient and labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 FIG. is a schematic view of the folded state of the blade of the folding knife according to this embodiment.

[0012] Figure 2 FIG. is a schematic view of the connection line between the center point of the second connecting pin and the center points of the first connecting pin and the third connecting pin of the folding knife according to this embodiment.

[0013] Figure 3 FIG. is a schematic view of the semi-open state of the blade of the folding knife according to this embodiment.

[0014] Figure 4 FIG. is a schematic view of the open state of the blade of the folding knife according to this embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The present invention will be further described below with reference to the accompanying drawings. The accompanying drawings are only for illustrative purposes and should not be construed as a limitation of this patent.

[0016] In order to more concisely illustrate this embodiment, some components that are well-known to those skilled in the art but not relevant to the main content of this creation will be omitted in the drawings or the description. In addition, for the convenience of expression, some components in the drawings will be omitted, enlarged or reduced, but this does not represent the size or all structures of the actual product.

[0017] Embodiment

[0018] As Figures 1-4As shown in the figure, this embodiment provides a folding knife, which includes a knife handle 1 and a blade 2. The knife handle 1 includes two stainless steel plates arranged at intervals, and the space between the two plates is a knife groove. The blade 2 is hinged to the front end position in the knife groove through a first connecting pin 31. The blade 2 can rotate relative to the knife groove around the first connecting pin 31 to open and fold in the knife groove. The above folding knife further includes a boosting mechanism that can boost the blade 2 in the opening and folding directions. The boosting mechanism includes a first transmission rod 11, a second transmission rod 12, and a spring arm 13. The front end of the first transmission rod 11 is hinged to the side surface of the blade 2 through a second connecting pin 32. The middle part of the second transmission rod 12 is hinged to the outer side surface of one of the stainless steel plates of the knife handle 1 through a fourth connecting pin, and the front end of the second transmission rod 12 is hinged to the rear end of the first transmission rod 11 through a third connecting pin 33. The rear end of the second transmission rod 12 is connected to the free end of the spring arm 13. As Figure 2 shown, when the center point of the second connecting pin 32, the center point of the first connecting pin 31, and the center point of the third connecting pin 33 are on the same straight line, the rear end of the second transmission rod 12 will drive the free end of the spring arm 13 to deform downward to the lowest point. As Figure 1 shown, when the center point of the second connecting pin 32 is located above the center line connecting the first connecting pin 31 and the third connecting pin 33, the free end of the spring arm 13 will automatically reset upward and drive the second transmission rod 12 to rotate counterclockwise. The second transmission rod 12 will drive the front end of the first transmission rod 11 to drive the blade 2 to rotate counterclockwise, so that the front end of the first transmission rod 11 boosts the blade 2 to rotate in the folding direction. As Figure 3 、 4 shown, when the center point of the second connecting pin 32 is located below the center line connecting the first connecting pin 31 and the third connecting pin 33, the free end of the spring arm 13 will also automatically reset upward and drive the second transmission rod 12 to rotate counterclockwise. At this time, the second transmission rod 12 will drive the front end of the first transmission rod 11 to drive the blade 2 to rotate clockwise, so that the front end of the first transmission rod 11 boosts the blade 2 to rotate in the opening direction.

[0019] The center lines of the above first connecting pin 31, second connecting pin 32, third connecting pin 33, and fourth connecting pin are parallel to each other. The above spring arm 13 is integrally formed by directly opening a notch 130 in the stainless steel plate connecting the second transmission rod 12 of the knife handle 1. A convex column 131 is extended and provided on one side of the rear end of the second transmission rod 12 corresponding to the spring arm 13. The convex column 131 is located above the spring arm 13, and the convex column 131 can abut against the free end of the spring arm 13. When the rear end of the second transmission rod 12 rotates downward, the convex column 131 of the second transmission rod 12 can push the free end of the spring arm 13 to deform downward.

[0020] The stainless steel plate of the above-mentioned knife handle 1 connecting the second transmission rod 12 is hollowed out with a guide groove 10 on one side corresponding to the position of the elastic arm 13. The first transmission rod 11 is placed in the guide groove 10 and can rotate relative to the inner side of the guide groove 10. The guide groove 10 has a starting point 101 and an ending point 102. As Figure 1 shown, when the blade 2 rotates to the folded state, the front end of the first transmission rod 11 rotates to the starting point 101 position of the guide groove 10, preventing the blade 2 from rotating excessively in the folding direction. As Figure 4 shown, when the blade 2 rotates to the open state, the front end of the first transmission rod 11 rotates to the ending point 102 position of the guide groove 10, preventing the blade 2 from rotating excessively in the open direction. An outer handle for thickening the thickness of the knife handle is also provided on the outer sides of the two stainless steel plates of the knife handle 1. For the convenience of expressing the internal structure of the knife handle, the outer handle is omitted in the drawings. The outer handle can be made of plastic, wood or metal materials, and an avoidance groove is provided on the inner side of the outer handle at the position corresponding to the assisting mechanism.

[0021] When the folding knife of the present invention is in use, when it is necessary to open the blade 2, as Figure 1 shown, the blade 2 can be rotated clockwise in the open direction by pinching the back of the blade 2 with fingers. When the blade 2 rotates, it will drive the first transmission rod 11 to rotate. At the same time, the first transmission rod 11 will drive the second transmission rod 12 to rotate. The convex column 131 of the second transmission rod 12 pushes the free end of the elastic arm 13 downward to deform. When the elastic arm 13 undergoes elastic deformation, it will act on the second transmission rod 12 in the reverse direction, making it have a tendency to rotate counterclockwise. That is, the assisting mechanism will provide a force opposite to the open direction for the blade 2. The blade 2 needs to overcome the force provided by the elastic arm 13 in the open process, which can prevent the blade from accidentally opening without the force applied by the user and improve safety. As Figure 2 shown, when the center point of the second connecting pin 32, the center point of the first connecting pin 31, and the center point of the third connecting pin 33 are on the same straight line, at this time, the free end of the elastic arm 13 is pushed downward by the convex column 131 to deform to the lowest point. And then, by slightly pulling the back of the blade 2 downward to rotate the blade 2 clockwise in the open direction, the midpoint of the second connecting pin 32 is located below the center connection line of the first connecting pin 31 and the third connecting pin 33. At this time, the free end of the elastic arm 13 automatically resets upward, and the force acting on the second transmission rod 12 and the first transmission rod 11 will change to a driving force for driving the blade 2 to rotate clockwise, so that the front end of the first transmission rod 11 rotates downward to the ending point 102 position of the guide groove 10, as Figure 4 shown, the blade 2 can be rotated to the open state, which is convenient and fast to open and saves physical strength consumption. As Figure 2As shown in the figure, on the contrary, when the blade 2 is folded from the open state, before the blade 2 rotates to the point where the center point of the second connecting pin 32, the center point of the first connecting pin 31, and the center point of the third connecting pin 33 are on the same straight line, the elastic arm 13 provides a resistance in the clockwise direction to hinder the folding of the blade 2 through the assisting mechanism. After the blade 2 rotates to the point where the center point of the second connecting pin 32, the center point of the first connecting pin 31, and the center point of the third connecting pin 33 are on the same straight line, the elastic arm 13 provides an assisting force in the counterclockwise direction to help the blade 2 fold through the assisting mechanism. As Figure 1 shown, until the front end of the first transmission rod 11 rotates upward to the starting point 101 of the guide groove 10, that is, the blade 2 is rotated to the folded state. At this time, the free end of the elastic arm 3 will continue to reset upward and continuously provide a counterclockwise rotational force to the blade 2, which can prevent the blade 2 from automatically opening in the folded state, improve the folding stability of the blade 2, and make it safer to use.

[0022] The above is only a specific embodiment of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantive modification made to the present invention using the design concept of the present invention falls within the protection scope of the present invention.

Claims

1. A folding knife, comprising a handle (1) and a blade (2), wherein the handle (1) is provided with a knife groove, and the blade (2) is hinged to an end position within the knife groove by a first connecting pin (31), and the blade (2) can rotate relative to the knife groove around the first connecting pin (31) to be opened and folded within the knife groove, characterized in that: It further includes a boosting mechanism that can boost the blade (2) in the opening and folding directions. The boosting mechanism includes a first transmission rod (11), a second transmission rod (12), and a spring arm (13). The front end of the first transmission rod (11) is hinged to the blade (2) through a second connecting pin (32). The middle of the second transmission rod (12) is hinged to the knife handle (1). One end of the second transmission rod (12) is hinged to the rear end of the first transmission rod (11) through a third connecting pin (33), and the other end is connected to the free end of the spring arm (13). When the blade (2) is operated in the opening direction from the folded state, before the center point of the second connecting pin (32) passes through the center line connecting the first connecting pin (31) and the third connecting pin (33), the boosting mechanism provides a boosting effect on the blade (2) in the folding direction. After the center point of the second connecting pin (32) passes through the center line connecting the first connecting pin (31) and the third connecting pin (33), the boosting mechanism provides a boosting effect on the blade (2) in the opening direction.

2. The folding knife according to claim 1, wherein: A guide groove (10) is formed on the side surface of the knife handle (1). The first transmission rod (11) is located in the guide groove (10) and can rotate relative to the inner side of the guide groove (10). The guide groove (10) has a starting point (101) and an ending point (102). When the blade (2) rotates to the folded state, the front end of the first transmission rod (11) rotates to the starting point (101) position of the guide groove (10). When the blade (2) rotates to the open state, the front end of the first transmission rod (11) rotates to the ending point (102) position of the guide groove (10).

3. The folding knife according to claim 2, characterized in that: The spring arm (13) is formed by directly opening a notch (130) on one side surface of the knife handle (1) corresponding to the position of the guide groove (10).

4. The folding knife according to claim 3, characterized in that: One end of the second transmission rod (12) corresponding to the connection with the spring arm (13) is in contact connection with the free end of the spring arm (13) through a convex column (131).

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