knife

Abstract

To provide a knife configured so that a blade member stored between a first grip and a second grip can be suppressed from being exposed unintentionally from a space between the first grip and the second grip.SOLUTION: A knife 1 comprises a blade member 2, a first shaft member 3, a second shaft member 4, a first grip 5, a second grip 6 and a friction member 7. The blade member 2 has a cutting blade 2a, and a back part 2c at the opposite side of a cutting blade 2b. The first grip 5 can store the cutting blade 2b and can turn with respect to the blade member 2 with the first shaft member 3 as a shaft center. The second grip 6 can store the back part 2c and can turn with respect to the blade member 2 with the second shaft member 4 as a shaft center. The friction member 7 is arranged between the first grip 5 and the blade member 2. The friction member 7 frictionally contacts at least either of the first grip 5 and the blade member 2 to restrict the first grip 5 from turning with respect to the blade member 2.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a knife.

Background Art

[0002] Conventionally, a knife is known that includes a blade member, a first grip rotatable with respect to the blade member, a second grip rotatable about an axis different from the first grip with respect to the blade member, and a connecting member that connects the first grip and the second grip. The knife is foldable and can take a closed state in which the blade member is housed between the first grip and the second grip, and an open state in which the blade member is exposed from the first grip and the second grip. The connecting member connects the first grip and the second grip in both the closed state and the open state.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a conventional knife, when the first grip and the second grip are not connected by the connecting member in the closed state, there is a risk that the blade member may be unintentionally exposed from between the first grip and the second grip.

[0005] An object of the present invention is to provide a knife capable of suppressing the unintentional exposure of a blade member housed between a first grip and a second grip from between the first grip and the second grip.

Means for Solving the Problems

[0006] A knife according to one aspect of the present invention comprises a blade member, a first shaft member, a second shaft member, a first grip, a second grip, and a friction member. The blade member has a cutting edge and a back portion opposite to the cutting edge. The first shaft member has an axis extending in a direction intersecting the blade member and is positioned on the base end side of the cutting edge. The second shaft member has an axis parallel to the axis of the first shaft member and is positioned on the base end side of the back portion. The first grip is capable of housing the cutting edge and is rotatable relative to the blade member with the first shaft member as its axis. The second grip is capable of housing the back portion and is rotatable relative to the blade member with the second shaft member as its axis. The friction member is positioned between the first grip and the blade member. The friction member frictionally contacts at least one of the first grip and the blade member to restrict the rotation of the first grip relative to the blade member.

[0007] In this knife, the friction member makes frictional contact with at least one of the first grip and the blade member, restricting the rotation of the first grip relative to the blade member. This prevents the cutting edge of the blade member, which is housed in the first grip, from being unintentionally exposed between the first and second grips. As a result, the safety of the knife is improved.

[0008] The friction member may be arranged around the axis of the first shaft member. In this case, the friction member can be easily placed between the first grip and the blade member.

[0009] The friction element may be a wave washer. In this case, a stable frictional force can be generated between the first grip and the blade element.

[0010] The knife may further include a connecting member connected to either the first grip or the second grip. The connecting member may be capable of connecting the first grip and the second grip when the cutting edge is housed in the first grip and the spine is housed in the second grip. In this case, the cutting edge housed in the first grip can be further prevented from being unintentionally exposed between the first and second grips. As a result, the safety of the knife is further improved.

[0011] The connecting member may connect the first grip and the second grip in a state where the cutting edge is exposed from the first grip and the back of the second grip is exposed. In this case, it is possible to prevent the first grip and the second grip from separating from each other when using the knife.

[0012] The first and second grips may have asymmetrical shapes. In this case, it becomes possible to improve the grip on the knife when using it.

[0013] The first grip may be designed to retract the tip end of the cutting blade. In this case, the safety of the knife is further enhanced. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide a knife that can prevent the blade member housed between the first grip and the second grip from being unintentionally exposed from between the first grip and the second grip. [Brief explanation of the drawing]

[0015] [Figure 1] Plan view of the knife in the closed position. [Figure 2] Side view of the knife in the closed position. [Figure 3] Cross-sectional view of the knife in Figure 1, cut along line III-III. [Figure 4] Cross-sectional view of the knife in Figure 1, cut along line IV-IV. [Figure 5] A partial cross-sectional view of the knife shown in Figure 2, cut along a VV line. [Figure 6] This diagram shows an example of when the connecting member is moved from the first locked position to the unlocked position. [Figure 7] This figure shows an example of when the first grip and the second grip are rotated relative to the blade member. [Figure 8] Plan view of the knife in the open position. [Modes for carrying out the invention]

[0016] A knife 1 according to an embodiment of the present invention is foldable. The knife 1 can take a closed state (see FIG. 1) and an open state (see FIG. 8). The open state is the state when the knife 1 is used.

[0017] As shown in FIGS. 1 and 2, the knife 1 includes a blade member 2, a first shaft member 3, a second shaft member 4, a first grip 5, a second grip 6, a friction member 7, and a connecting member 8. The knife 1

[0018] In the following description, the direction from the first shaft member 3 toward the second shaft member 4 is referred to as upward, the opposite direction is referred to as downward, the direction from the proximal end side (left side in the plane of FIG. 1) to the distal end side (right side in the plane of FIG. 1) of the blade member 2 is referred to as forward, the opposite direction is referred to as backward, and the direction orthogonal to the plane of FIG. 1 is referred to as the left - right direction.

[0019] As shown in FIGS. 1, 3, and 4, the blade member 2 has a blade body 2a, a cutting edge 2b, a back 2c, and first to third through - holes 2d to 2f.

[0020] The blade body 2a extends in the left - right direction. The blade body 2a is formed such that the vertical dimension decreases as it approaches the distal end. The cutting edge 2b is disposed at the upper end of the blade body 2a and extends in the left - right direction. As shown in FIG. 4, the thickness (dimension in the left - right direction) of the cutting edge 2b is thinner than the thickness of the back 2c. The cutting edge 2b is housed in the first grip 5 in the closed state. The end portion 2g on the distal end side of the cutting edge 2b is housed in the first grip 5 in the closed state. The end portion 2g on the distal end side of the cutting edge 2b overlaps the first grip 5 in plan view in the closed state. That is, in the closed state, the end portion 2g on the distal end side of the cutting edge 2b does not protrude from the first grip 5. The back 2c is disposed on the side opposite to the cutting edge 2b. The back 2c is disposed at the lower end of the blade member 2 and extends in the left - right direction.

[0021] The first to third through holes 2d to 2f penetrate the blade body 2a in the front-to-back direction. The first through hole 2d is formed on the base end side of the cutting edge 2b. The second through hole 2e is formed on the base end side of the back portion 2c. The second through hole 2e is aligned vertically with the first through hole 2d. The third through hole 2f is formed on the base end side of the blade body 2a, in the center of the blade body 2a in the vertical direction. The third through hole 2f is located to the left of the first through hole 2d and the second through hole 2e.

[0022] The first shaft member 3 has an axis A1 extending in a direction intersecting the blade member 2. The axis A1 extends in the front-rear direction. The first shaft member 3 is positioned on the base end side of the cutting edge 2b. The first shaft member 3 is positioned in the first through hole 2d. The first shaft member 3 penetrates the first grip 5 in the front-rear direction. The first shaft member 3 connects the blade member 2 and the first grip 5. The first shaft member 3 rotatably supports the first grip 5. The first shaft member 3 has an open end 3a into which the engagement pin 12 is inserted.

[0023] The second shaft member 4 has an axis A2 parallel to the axis A1 of the first shaft member 3. The axis A2 extends in the front-rear direction. The second shaft member 4 is positioned on the base end side of the back portion 2c. The second shaft member 4 is positioned in the second through hole 2e. The second shaft member 4 is aligned vertically with the first shaft member 3. The second shaft member 4 penetrates the second grip 6 in the front-rear direction. The second shaft member 4 connects the blade member 2 and the second grip 6. The second shaft member 4 rotatably supports the second grip 6. The second shaft member 4 has an open end 4a into which the engagement pin 14 is inserted.

[0024] The first grip 5 is rotatable relative to the blade member 2 with the first shaft member 3 as its axis. The first grip 5 is rotatable around the axis A1 of the first shaft member 3. The base end of the first grip 5 is rotatably supported by the first shaft member 3.

[0025] The first grip 5 is capable of housing the cutting blade 2b. The first grip 5 is capable of housing the tip end 2g of the cutting blade 2b. The first grip 5 has a first surface 5a, a second surface 5b, a first recess 5c, and a second recess 5d. The first surface 5a corresponds to the upper surface of the first grip 5 in Figure 1. The second surface 5b is the surface opposite to the first surface 5a and corresponds to the lower surface of the first grip 5 in Figure 1. The first surface 5a has a shape that is curved convexly toward the second surface 5b.

[0026] As shown in Figure 4, the first recess 5c is formed on the first surface 5a. The first recess 5c has a shape that recesses from the first surface 5a toward the second surface 5b. The first recess 5c extends from the base end of the first grip 5 toward the tip of the first grip 5. The second recess 5d is formed at the tip of the first grip 5. The second recess 5d has a shape that recesses from the tip toward the base end of the first grip 5.

[0027] The second grip 6 is rotatable relative to the blade member 2 with the second shaft member 4 as its axis. The second grip 6 is rotatable around the axis A2 of the second shaft member 4. The base end of the second grip 6 is rotatably supported by the second shaft member 4.

[0028] The second grip 6 is capable of accommodating the back portion 2c. The second grip 6 has a first surface 6a, a second surface 6b, a first recess 6c, and a second recess 6d. The first surface 6a corresponds to the bottom surface of the second grip 6 in Figure 1. The second surface 6b is the surface opposite to the first surface 6a and corresponds to the top surface of the second grip 6 in Figure 1.

[0029] The first recess 6c is formed on the first surface 6a. As shown in Figure 4, the first recess 6c has a shape that recesses from the first surface 6a toward the second surface 5b. The first recess 6c extends from the base end of the second grip 6 toward the tip of the second grip 6. The second recess 6d is formed at the tip of the second grip 6. The second recess 6d has a shape that recesses from the tip toward the base end of the second grip 6.

[0030] The first grip 5 and the second grip 6 have asymmetrical shapes. The widthwise dimension of the base end of the first grip 5 is greater than the widthwise dimension of the base end of the second grip 6. Here, the widthwise dimension corresponds to the vertical direction in Figure 1. That is, the widthwise dimension of the first grip 5 is the dimension from the first surface 5a to the second surface 5b, and the widthwise dimension of the second grip 6 is the dimension from the first surface 6a to the second surface 6b.

[0031] The friction member 7 is positioned between the first grip 5 and the blade member 2. The friction member 7 frictionally contacts at least one of the first grip 5 and the blade member 2 to restrict the rotation of the first grip 5 relative to the blade member 2. In this embodiment, the friction member 7 is positioned in contact with both the first grip 5 and the blade member 2, and frictionally contacts both the first grip 5 and the blade member 2. The friction member 7 is positioned around the axis of the first shaft member 3. The friction member 7 is positioned around the first through hole 2d. The friction member 7 is positioned on both sides of the blade member 2 in the left-right direction. The friction member 7 is, for example, a wave washer. The friction member 7 is positioned in a positioning portion 5e formed within the first recess 5c of the first grip 5. The positioning portion 5e has a shape that is recessed in the left-right direction from a pair of side surfaces 5f of the first recess 5c.

[0032] The connecting member 8 is connected to either the first grip 5 or the second grip 6. In this embodiment, the connecting member 8 is connected to the second grip 6. The connecting member 8 is rotatably supported by a shaft member 16 located at the tip of the second grip 6.

[0033] The connecting member 8 can connect the first grip 5 and the second grip 6 in the closed state shown in Figure 1. The connecting member 8 can also connect the first grip 5 and the second grip 6 in the open state shown in Figure 8. The closed state is when the cutting blade 2b is housed in the first grip 5 and the back portion 2c is housed in the second grip 6. The open state is when the knife 1 is in use. More specifically, in the open state, the tip of the first grip 5 and the tip of the second grip 6 are positioned on the opposite side from the tip of the blade member 2.

[0034] The connecting member 8 is movable between a first locked position shown in Figure 1, an unlocked position shown in Figure 6, and a second locked position shown in Figure 8. In the first locked position, the connecting member 8 connects the first grip 5 and the second grip 6 in the closed state, locking the rotation of the first grip 5 and the second grip 6 relative to the blade member 2. In the unlocked position, the connecting member 8 allows the rotation of the first grip 5 and the second grip 6 relative to the blade member 2. In the second locked position, the connecting member 8 connects the first grip 5 and the second grip 6 in the open state, locking the rotation of the first grip 5 and the second grip 6 relative to the blade member 2.

[0035] As shown in Figures 2 and 4, the connecting member 8 has a locking portion 8a and an engaging portion 8b. The locking portion 8a covers a part of the second surface 5b of the first grip 5 in the first and second locked positions. The locking portion 8a restricts the first grip 5 from separating from the second grip 6. The engaging portion 8b engages with the engaged portion 5g formed in the second recess 5d of the first grip 5 in the first and second locked positions. The engaging portion 8b is configured to fit in a concave-concave manner with the engaged portion 5g. As a result, in the closed and open states, the first grip 5 is connected to the second grip 6 by the connecting member 8. In the released position, the engagement of the engaging portion 8b with the engaged portion 5g is released.

[0036] To move the knife 1 from the closed state to the open state, the connecting member 8 is rotated from the first locked position shown in Figure 1 to the released position shown in Figure 6. That is, the engagement between the engaging portion 8b and the engaged portion 5g is released. This allows the first grip 5 and the second grip 6 to rotate relative to the blade member 2.

[0037] After rotating the connecting member 8 to the release position, as shown in Figure 7, the first grip 5 and the second grip 6 are rotated relative to the blade member 2 so that the tips of the first grip 5 and the second grip 6 are positioned on the opposite side from the tip of the blade member 2. Then, as shown in Figure 8, with the first grip 5 and the second grip 6 aligned vertically, the connecting member 8 is rotated to the second lock position. This connects the first grip 5 and the second grip 6, locking the rotation of the first grip 5 and the second grip 6 relative to the blade member 2.

[0038] Furthermore, a locking projection 18 is positioned in the third through-hole 2f. When the grip is open, the locking projection 18 generates an elastic force that causes the first grip 5 and the second grip 6 to move away from each other. This suppresses rattling of the blade member 2 when the grip is open.

[0039] In the knife 1 with the above configuration, the friction member 7 is positioned between the first grip 5 and the blade member 2, and frictionally contacts both the first grip 5 and the blade member 2 to restrict the rotation of the first grip 5 relative to the blade member 2. This prevents the cutting edge 2b of the blade member 2, which is housed in the first grip 5, from being unintentionally exposed between the first grip 5 and the second grip 6. As a result, the safety of the knife 1 is improved.

[0040] <Other Embodiments> Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the invention.

[0041] The configuration of the friction member 7 may be changed. The friction member 7 does not have to be a wave washer. The friction member 7 may be integrated with the first grip 5 or the blade member 2. The friction member 7 may be attached to at least one of the first grip 5 or the blade member 2.

[0042] The connecting member 8 may be omitted. The locking projection 18 may be integrated with the blade member 2. The first shaft member 3 and the second shaft member 4 may be fixed to the blade member 2 or integrated with the blade member 2. The first shaft member 3 may be fixed to the first grip 5, and the second shaft member 4 may be fixed to the second grip 6. [Explanation of Symbols]

[0043] 1 knife 2 Blade members 2b Cutting edge 2c back 3 First shaft member 4 Second shaft member 5. First Grip 6. Second grip 7 Friction Members 8 Connecting members

Claims

1. A blade member having a cutting edge and a back portion opposite to the cutting edge, A first shaft member having an axis extending in a direction intersecting the blade member and positioned on the base end side of the cutting edge, A second shaft member having an axis parallel to the axis of the first shaft member and positioned on the base end side of the back portion, A first grip capable of housing the cutting blade and rotatable relative to the blade member with the first shaft member as its axis, The aforementioned back portion can be stored, and the second grip is rotatable relative to the blade member with the second shaft member as its axis, A friction member is positioned between the first grip and the blade member and frictionally contacts at least one of the first grip and the blade member to restrict the rotation of the first grip relative to the blade member, A connecting member is connected to either the first grip or the second grip, and is capable of connecting the first grip and the second grip when the cutting blade is housed in the first grip and the back is housed in the second grip. A third shaft member is positioned on either the first grip or the second grip and rotatably supports the connecting member, Equipped with, The first grip is capable of housing the tip end of the cutting blade, The other of the first grip and the second grip has a recess at the tip of the other of the first grip and the second grip that is recessed from the tip of the other of the first grip and the second grip toward the base end, The connecting member has an engaging portion that engages with an engaging portion formed in the recess when the first grip and the second grip are connected in the locked position, and is housed in the recess when the locked position is reached. knife.

2. The friction member is arranged around the axis of the first shaft member. The knife according to claim 1.

3. The friction member is a wave washer. The knife according to claim 2.

4. The connecting member is capable of connecting the first grip and the second grip in a state in which the cutting blade is exposed from the first grip and the back portion is exposed from the second grip. The knife according to any one of claims 1 to 3.

5. The first grip and the second grip have asymmetrical shapes. The knife according to any one of claims 1 to 3.

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