utility knife

Abstract

A utility knife (100) includes a main body (2), a slider (3), a cap (4), and an elastic body (5). The slider (3) is configured to move between a protruding position in which a blade (1) protrudes from a front end portion (21a) and a housed position in which the blade (1) is housed between the front end portion (21a) and a rear end portion (21b) inside the main body (2). The cap (4) is fixed to the rear end portion (21b) in a use state in which the slider (3) is disposed in the protruding position and a non-use state in which the slider (3) is disposed in the housed position. The elastic body (5) applies a force to the slider (3) toward the cap (4) in the use state and the non-use state. The slider (3) reaches the rear end portion (21b) in the non-use state.

Description

Technical Field

[0001] This invention relates to a utility knife. Background Technology

[0002] Previously, there existed a type of utility knife called a safety cutter. A safety cutter includes a main body, a slider, and an elastic body. The slider is connected to the blade inside the main body. The blade is forced backward by the elastic body. The safety cutter is configured to switch between a used state (where the blade protrudes from the main body) and a non-used state (where the blade is retracted into the main body) by moving the blade. The slider in the non-used state is positioned further back than the slider in the used state. By moving the slider backward under the force of the elastic body, the safety cutter can be switched from the used state to the non-used state.

[0003] For example, the quick-retracting slider (utility knife) described in Patent No. 3325524 (Patent Document 1) includes a holder (body), a main slider, a locking mechanism, a secondary slider, an elastic body, and a connecting mechanism. The main slider is configured to move relative to the holder in the front-back direction. The locking mechanism is configured to lock the main slider against the holder. The secondary slider and the guide body (blade) are positioned further forward than the main slider. The secondary slider is configured to move relative to the main slider in the front-back direction. The guide body is connected to the secondary slider. The elastic body is configured to apply a force to the secondary slider in the rearward direction relative to the main slider. The connecting mechanism connects the main slider and the secondary slider. (Prior art documents) Patent documents

[0004] Patent Document 1: Japanese Patent No. 3325524 Summary of the Invention The technical problem that the invention aims to solve

[0005] In the quick-release slider described in the aforementioned announcement, the main slider is positioned further forward than the rear end of the cage. Since the secondary slider is positioned further forward than the main slider, it does not reach the rear end of the cage. Therefore, when the quick-release slider is not in use, the track will protrude from the front end of the cage.

[0006] The present invention was made in view of the above-mentioned technical problems, and its object is to provide a utility knife in which the blade does not protrude from the front end of the body when not in use. Technical solutions adopted to solve technical problems

[0007] The utility knife of the present invention includes a body, a slider, a cap, and an elastic body. The body includes a front end and a rear end, which are opposite to the front end. The slider is configured to hold the blade inside the body. The slider is configured to move within the body between a protruding position and a retracted position, wherein the blade protrudes from the front end in the protruding position and is retracted between the front and rear ends in the retracted position. The cap is fixed to the rear end. The elastic body connects the slider to the cap. The cap is fixed to the rear end in a used state where the slider is in the protruding position and in a non-used state where the slider is in the retracted position. The elastic body applies force to the slider toward the cap in both the used and non-used states. The slider reaches the rear end in the non-used state. Invention Effects

[0008] According to the utility knife of the present invention, the blade does not protrude from the front end of the body when not in use. Attached Figure Description

[0009] Figure 1 This is a top view schematically showing the structure of the utility knife limiter of Embodiment 1 in a first position. Figure 2 This is a side view schematically showing the structure of the utility knife in Embodiment 1. Figure 3 It is along Figure 1 A cross-sectional view along line III-III. Figure 4 This is a cross-sectional view schematically showing the structure of the utility knife of Embodiment 1 in its use state, with the blade protruding from the main body. Figure 5 This is a top view schematically showing the structure of the utility knife limiter of Embodiment 1 in the second position. Figure 6 This is a top view schematically showing the structure of the utility knife limiter of Embodiment 1 in the third position. Figure 7 This is a partial perspective view schematically showing the movable state of the lever of the utility knife in Embodiment 1 in a movable position. Figure 8 This is a perspective view schematically showing the structure of the sliding component of the utility knife in Embodiment 1. Figure 9 This is a side view schematically showing the structure of the slider of the utility knife in Embodiment 1. Figure 10 It is along Figure 9 A cross-sectional view of the X-ray. Figure 11 This is a perspective view schematically showing the structure of the cap of the utility knife in Embodiment 1. Figure 12 This is a perspective view taken from one side, schematically illustrating the structure of the limiter of the utility knife in Embodiment 1. Figure 13 This is a perspective view taken from the other side, schematically illustrating the structure of the limiter of the utility knife in Embodiment 1. Figure 14 It is a perspective view schematically showing the structure of the lever and hinge of the utility knife in Embodiment 1. Figure 15 This is a partial cross-sectional view schematically showing the structure of the utility knife limiter of Embodiment 1 in a first position. Figure 16 This is a partial cross-sectional view schematically showing the structure of the utility knife limiter of Embodiment 1 in the second position. Figure 17 This is a partial cross-sectional view schematically showing the structure of the utility knife limiter of Embodiment 1 in the third position. Figure 18 This is a partial cross-sectional view schematically showing the state in which the hinge and cap of the utility knife in Embodiment 1 are engaged. Figure 19 This is a partial cross-sectional view schematically showing the structure of the utility knife in Embodiment 1 with the hinge and cap disengaged. Figure 20 This is a partial cross-sectional view schematically showing the movable state of the lever of the utility knife in Embodiment 1 in a movable position. Figure 21 This is a partial cross-sectional view schematically illustrating the structure of the utility knife in Embodiment 2. Detailed Implementation

[0010] The embodiments will now be described based on the accompanying drawings. Furthermore, identical or equivalent parts will be labeled with the same symbols, and descriptions will not be repeated.

[0011] Implementation Method 1 use Figures 1 to 14 The structure of the utility knife 100 in Embodiment 1 will be described.

[0012] like Figure 1 As shown, the utility knife 100 is configured to hold the blade 1. A cutting edge is provided at the front end of the blade 1. The blade 1 includes multiple cutting edge portions 10. The multiple cutting edge portions 10 are interconnected. The multiple cutting edge portions 10 are detachable from each other.

[0013] The utility knife 100 includes a main body 2, a slider 3, a cap 4, and an elastic body 5 (see reference). Figure 3 Preferably, the utility knife 100 also includes a limiter 6, a lever 7, and a hinge 8 (see reference). Figure 3 ). Figure 1 This is a top view schematically showing the structure of the utility knife 100 with the limiter 6 configured in the first position. As described later, the limiter 6 can move to the first position, the second position, and the third position.

[0014] The main body 2 includes a retainer 21 and a cover 22. The retainer 21 is configured to house the blade 1. The retainer 21 is, for example, made of metal. The metal retainer 21 is a metal body. The cover 22 is configured to partially cover the retainer 21. Figure 1 and Figure 2 As shown, the cover 22 covers a portion of the front, sides, and back of the retainer 21. A portion of the surface of the retainer 21 is exposed from the cover 22. An anti-slip portion 23 may also be provided on the cover 22. The anti-slip portion 23 has irregularities.

[0015] like Figure 3 As shown, the main body 2 includes a front end portion 21a and a rear end portion 21b. Figure 3 yes Figure 1 A cross-sectional view at line III-III. The rear end 21b is opposite to the front end 21a. The dimension of the main body 2 in the long side direction is greater than the dimension of the blade 1 in the long side direction. That is, the dimension of the main body 2 from the front end 21a to the rear end 21b is greater than the dimension of the blade 1 in the long side direction.

[0016] In this embodiment, the direction from the rear end portion 21b to the front end portion 21a is the first direction DR1. The first direction DR1 runs along the long side of the main body 2. The side of the front end portion 21a that is positioned relative to the rear end portion 21b is in front of the first direction DR1. The side of the rear end portion 21b that is positioned relative to the front end portion 21a is behind the first direction DR1. The limiter 6 is on one side relative to the side of the blade 1 that is positioned. The blade 1 is on the other side relative to the side of the limiter 6 that is positioned.

[0017] The slider 3 is configured to hold the blade 1 inside the body 2. The slider 3 is configured to connect to the blade 1 between the front end portion 21a and the rear end portion 21b. The connection point between the slider 3 and the blade 1 is located between the front end portion 21a and the rear end portion 21b. The slider 3 includes a first retaining protrusion 30 extending in a direction from one side to the other. An elastic body 5 is connected to the first retaining protrusion 30.

[0018] like Figure 3 and Figure 4 As shown, the slider 3 is configured to move along the first direction DR1. Figure 4 This is a cross-sectional view showing the structure of the utility knife 100 in use. The slider 3 is configured to protrude from the body 2 (see reference). Figure 4 ) and storage location (refer to) Figure 3The blade 1 moves between the front end 21a and the rear end 21b, and at the protruding position, the blade 1 protrudes from the front end 21a and at the retracted position, the blade 1 is retracted between the front end 21a and the rear end 21b.

[0019] The slider 3 includes a first extension portion extending along the body 2. The first extension portion is configured as a straight line. The body 2 includes a second extension portion extending along the slider 3. The second extension portion is configured as a straight line. Because the first and second extension portions are configured as straight lines, the slider 3 can move continuously inside the body 2. Therefore, the length of the slider 3 protruding from the body 2 can be continuously adjusted. Compared to the case where the slider 3 and the body 2 are fixed, for example, by means of a concave-convex joint, the length of the slider 3 protruding from the body 2 can be adjusted more easily. Furthermore, the length of the slider 3 protruding from the body 2 can be adjusted such that approximately the entire length of the blade 1 protrudes from the body 2.

[0020] like Figure 3 As shown, the slider 3 reaches the rear end 21b in the non-use state when it is positioned in the storage position. The slider 3 overlaps with the rear end 21b in the non-use state. The slider 3 protrudes rearward from the main body 2 in the non-use state. The slider 3 crosses the main body 2 and the cap 4 along the first direction DR1 in the non-use state.

[0021] The cap 4 can be fixed to the rear end 21b. The cap 4 can be fixed to the rear end 21b by partially inserting it into the interior of the main body 2 through the rear end 21b. The cap 4 has a portion facing the rear end 21b. The portion of the cap 4 facing the rear end 21b is configured to contact the rear end 21b.

[0022] Cap 4 in use with slider 3 positioned in the protruding position (see reference) Figure 4 The sliding member 3 is positioned in the storage location in its unused state (see reference). Figure 3 The cap 4 is fixed to the rear end 21b. (Refer to the usage state) Figure 4 ) and inactive state (see Figure 3 The cap 4 remains stationary relative to the rear end 21b. (Refer to the usage state) Figure 4 ) and inactive state (see Figure 3 The cap 4 does not move relative to the rear end 21b. (Refer to the usage state) Figure 4 ) and inactive state (see Figure 3 It contacts the rear end 21b.

[0023] The cap 4 includes a second retaining protrusion 40 extending from one side to the other. An elastomer 5 is connected to the second retaining protrusion 40. The cap 4 is configured to be separate from the main body 2. As described later, the cap 4 is configured to be detachable from the main body 2. The cap 4 is configured to be detachable from the main body 2 while still being integrated with the blade 1, the slider 3, and the elastomer 5.

[0024] The elastic body 5 connects the slider 3 to the cap 4. The elastic body 5 includes a front end portion 51 and a rear end portion 52. The front end portion 51 is positioned further forward than the rear end portion 52. The front end portion 51 is connected to the first retaining protrusion 30. The rear end portion 52 is connected to the second retaining protrusion 40. The elastic body 5 connects the slider 3 to the cap 4 by connecting the first retaining protrusion 30 to the second retaining protrusion 40.

[0025] Elastomer 5 in use (refer to) Figure 4 ) and inactive state (see Figure 3 The sliding member 3 is forced towards the cap 4. The elastic body 5 forces the sliding member 3 backward. The elastic body 5 forces the cap 4 forward. Thus, the elastic body 5 presses the cap 4 against the body 2.

[0026] The elastic body 5 is configured to extend and retract along the first direction DR1. The elastic body 5 is, for example, a spring. The elastic body 5 is, for example, a tension spring. The elastic body 5 is not limited to a spring and can be appropriately determined.

[0027] The limiter 6 is movably mounted on the slider 3 relative to the slider 3. The limiter 6 is movable relative to the slider 3 along a first direction DR1. Figure 1 and Figure 5 As shown, the limiter 6 is configured to move between a first position and a second position. Figure 5 This is a top view showing the structure of the utility knife 100 with the limiter 6 configured in the second position. (Example) Figure 6 As shown, preferably, the limiter 6 is configured to move to the third position. Figure 6 This is a top view showing the structure of the utility knife 100 with the limiter 6 positioned in the third position. The limiter 6 is configured to move between the first position, the second position, and the third position. That is, the slider 3 is configured to move in three stages. The first position, the second position, and the third position are sequentially positioned from the front. The first position is positioned further forward than the second position. The second position is positioned further forward than the third position.

[0028] When the limiter 6 is in the first position, the slider 3 is not fixed to the cap 4. That is, when the limiter 6 is in the first position, the slider 3 can move relative to the cap 4. When the limiter 6 is in the first position, as... Figure 4 As shown, the slider 3 can be positioned in the protruding position.

[0029] With the limiter 6 in the second position, the slider 3 is fixed to the cap 4. With the limiter 6 in the second position, the slider 3 is fixed to the storage position.

[0030] With the limiter 6 in the third position, the slider 3 is fixed to the cap 4. For example... Figure 7 As shown, the slider 3 is configured to be positioned in the third position of the limiter 6 (see reference). Figure 6 In the case of movement, it moves to a position further back than the rear end 21b. The slider 3 is configured to be pulled out from the main body 2 together with the cap 4 and the limiter 6.

[0031] like Figure 3 and Figure 7 As shown, lever 7 is rotatably mounted on the main body 2 relative to the main body 2. Lever 7 is configured to rotate between a fixed position and a movable position.

[0032] like Figure 3 As shown, with lever 7 in a fixed position, cap 4 is fixed to body 2. With lever 7 in a fixed position, cap 4 is clamped to body 2 by lever 7 to fix cap 4 to body 2. With lever 7 in a fixed position, lever 7 is linearly aligned with body 2. With lever 7 in a fixed position, lever 7 can rotate orthogonally to the first direction DR1 in its rotation direction. With lever 7 in a fixed position, lever 7 does not move parallel to the first direction DR1. Figure 3 In the diagram, the direction of rotation of lever 7 is indicated by a blank arrow.

[0033] like Figure 7 As shown, when lever 7 is in the movable position, cap 4 is not fixed to body 2. When lever 7 is in the movable position, lever 4 can move relative to body 2. When lever 7 is in the movable position, lever 7 does not clamp cap 4 to body 2. When lever 7 is in the movable position, lever 7 is located on the other side of cap 4. When lever 7 is in the movable position, lever 7 is configured not to obstruct cap 4 from detaching from body 2.

[0034] like Figure 3As shown, hinge 8 is mounted on lever 7. In this embodiment, hinge 8 and lever 7 are integrally formed. As described later, hinge 8 and lever 7 are separately formed. Hinge 8 is deformable. Hinge 8 is deformable in a manner that allows it to contract along a first direction DR1. Hinge 8 is deformable in a manner that allows its first end 81 to move rearward.

[0035] The hinge 8 is configured to engage with the cap 4 when the lever 7 is in a fixed position. The hinge 8 is also configured to engage with the cap 4 when the limiter 6 is in a first or second position. Specifically, the hinge 8 is configured to engage with the cap 4 by means of contact between its first end 81 and the cap 4. The lever 7 is configured to be fixed in a fixed position by engaging the hinge 8 with the cap 4. That is, the lever 7 is configured to not rotate relative to the cap 4 by engaging the hinge 8 with the cap 4.

[0036] like Figure 6 As shown, the limiter 6 is configured to move between the limiter 6 and the hinge 8 (see reference). Figure 3 The third position of contact. Lever 7 is configured to move from the first or second position to the third position via limiter 6, and can rotate from a fixed position to a movable position. Hinge 8 (see reference) Figure 3 The configuration is such that, by positioning the limiter 6 in the third position, it engages with the hinge 8 (see reference). Figure 3 When in contact with the limiter 6, the engagement with the cap 4 is released by deformation caused by contact with the limiter 6. Specifically, the hinge 8 (refer to...) Figure 3 ) is configured such that, via hinge 8 (refer to Figure 3 The first end 81 (refer to) Figure 3 The deformation is achieved by extruding from the cap 4 to release the fit with the cap 4.

[0037] <Detailed Structure of Slider 3> Next, use Figures 8-10 The detailed structure of the slider 3 is explained.

[0038] like Figure 8 and Figure 9 As shown, the sliding member 3 includes a first part 31, a second part 32, and a third part 33. The first part 31, the second part 32, and the third part 33 are connected in sequence. A first anti-slip part 311 is provided in the first part 31. The first anti-slip part 311 is provided with protrusions and recesses.

[0039] like Figure 10As shown, the second part 32 is provided with a front first protrusion 32a1, a front second protrusion 32a2, a rear first protrusion 32b1, a rear second protrusion 32b2, a first straight section 32c1, and a second straight section 32c2. The front first protrusion 32a1 is opposite to the front second protrusion 32a2. The rear first protrusion 32b1 is opposite to the rear second protrusion 32b2. The first straight section 32c1 is opposite to the second straight section 32c2.

[0040] The front first protrusion 32a1 and the rear first protrusion 32b1 are connected by a first straight section 32c1. The front first protrusion 32a1 and the rear first protrusion 32b1 expand from the first straight section 32c1 towards the side opposite to the front second protrusion 32a2 and the rear second protrusion 32b2. The front second protrusion 32a2 and the rear second protrusion 32b2 are connected by a second straight section 32c2. The front second protrusion 32a2 and the rear second protrusion 32b2 expand from the second straight section 32c2 towards the side opposite to the front first protrusion 32a1 and the rear first protrusion 32b1.

[0041] The sliding member 3 includes a root portion 33a, a first protrusion 33b1, a second protrusion 33b2, a first engaging protrusion 33c1, a second engaging protrusion 33c2, a central first protrusion 33d1, and a central second protrusion 33d2. In this embodiment, the root portion 33a, the first protrusion 33b1, the second protrusion 33b2, the first engaging protrusion 33c1, the second engaging protrusion 33c2, the central first protrusion 33d1, and the central second protrusion 33d2 are disposed in the third portion 33. The first protrusion 33b1 and the second protrusion 33b2 protrude rearward from the root portion 33a. The first protrusion 33b1 and the second protrusion 33b2 are configured with a space between them. The first engaging protrusion 33c1 is connected to the front end of the first protrusion 33b1. The first engaging protrusion 33c1 extends from the first protrusion 33b1 to the second protrusion 33b2. The second engaging protrusion 33c2 is connected to the front end of the second protrusion 33b2. The second engaging protrusion 33c2 extends from the second protrusion 33b2 toward the first protrusion 33b1. The intermediate first protrusion 33d1 is connected to the first protrusion 33b1. The intermediate first protrusion 33d1 extends from the first protrusion 33b1 to the side opposite to the second protrusion 33b2. The intermediate second protrusion 33d2 is connected to the second protrusion 33b2. The intermediate second protrusion 33d2 extends from the second protrusion 33b2 to the side opposite to the first protrusion 33b1.

[0042] <Detailed Structure of Block 4> Next, use Figure 11 The detailed structure of cap 4 is explained.

[0043] like Figure 11As shown, the cap 4 includes a main body 41 and an insertion part 44. The main body 41 is configured to face the main body 2 (see reference). Figure 3 The insertion part 44 is configured to be inserted into the main body 2 (see reference). Figure 3 It is inserted into the main body 2 through the insertion part 44 (see reference). Figure 3 To suppress the cap 4 relative to the body 2 (refer to) Figure 3 Relative movement.

[0044] A groove 49 is provided in the cap 4. The groove 49 includes a first sidewall portion 43b1, a second sidewall portion 43b2, a first recess 43c1, and a second recess 43c2. In this embodiment, the groove 49 includes a first groove portion 42 and a second groove portion 43. The second groove portion 43 is provided at the bottom of the first groove portion 42. That is, the groove 49 is configured as a double layer. The second groove portion 43 includes a bottom 43a, a first sidewall portion 43b1, a second sidewall portion 43b2, a third sidewall portion 43b3, a first recess 43c1, and a second recess 43c2. The first sidewall portion 43b1, the second sidewall portion 43b2, the third sidewall portion 43b3, the first recess 43c1, and the second recess 43c2 stand upright from the bottom 43a. The second sidewall portion 43b2 is spaced apart from the first sidewall portion 43b1 and faces the first sidewall portion 43b1. The third sidewall portion 43b3 connects the first sidewall portion 43b1 to the second sidewall portion 43b2. The first recess 43c1 is configured to be recessed from the first sidewall portion 43b1 toward the side opposite to the second sidewall portion 43b2. The second recess 43c2 is configured to be recessed from the second sidewall portion 43b2 toward the side opposite to the first sidewall portion 43b1.

[0045] <Detailed Structure of Limiter 6> Next, use Figure 12 and Figure 13 The detailed structure of the limiter 6 will be explained.

[0046] like Figure 12 and Figure 13As shown, the limiter 6 includes a base 61, a one-side protrusion 62, a other-side protrusion 63, a front first protrusion 64a1, a front second protrusion 64a2, a first fixing protrusion 64b1, a second fixing protrusion 64b2, and a rear protrusion 65. The one-side protrusion 62 protrudes from the base 61 to one side. The other-side protrusion 63 protrudes from the base 61 to the other side. The front first protrusion 64a1 and the front second protrusion 64a2 protrude forward from the base 61. The front first protrusion 64a1 and the front second protrusion 64a2 are spaced apart. The first fixing protrusion 64b1 extends from the front end of the front first protrusion 64a1 to the front second protrusion 64a2. The second fixing protrusion 64b2 extends from the front end of the front second protrusion 64a2 to the front first protrusion 64a1. The first fixing protrusion 64b1 and the second fixing protrusion 64b2 face each other spaced apart. The rear protrusion 65 protrudes from the base to the rear.

[0047] <Detailed Structure of Lever 7> Next, use Figure 2 and Figure 14 The detailed structure of lever 7 is explained.

[0048] like Figure 14 As shown, the lever 7 includes a body 71, a first arm 72a, and a second arm 72b. The body 71 connects the first arm 72a and the second arm 72b. A hinge 8 is connected to the body 71. The first arm 72a and the second arm 72b extend forward from the body 71. The first arm 72a is rotatably mounted to the body. The second arm 72b is mounted on the side opposite to the first arm 72a relative to the body in a manner that allows it to rotate relative to the body. A first through hole 73a is provided in the first arm 72a. A second through hole 73 is provided in the second arm 72b. The first through hole 73a and the second through hole 73b are arranged to intersect with a first direction DR1.

[0049] like Figure 2 As shown, the first shaft portion 23a of the main body 2 is inserted into the first through hole 73a. Although not shown, the second shaft portion of the main body 2 is inserted into the second through hole 73b. Therefore, the lever 7 can rotate relative to the main body 2 with the first shaft portion 23a and the second shaft portion of the main body 2 as the center.

[0050] <Structure of utility knife 100 when limiter 6 is configured in the first position> Next, use Figure 15 The structure of the utility knife 100 when the limiter 6 is configured in the first position will be described in detail. Figure 15 This is a partial cross-sectional view showing the structure of the utility knife 100 with the limiter 6 positioned in the first position. For ease of explanation, in... Figure 15The diagram shows the first part 31 of the slider 3 (see reference). Figure 8 ) and the base 61 of the limiter 6 (refer to Figure 12 ).

[0051] The slider 3 is configured to allow the blade to protrude from the body 2 when the limiter 6 is in the first position. Therefore, the utility knife 100 is in use when the limiter 6 is in the first position. The slider 3 is configured to disengage from the cap 4 when the limiter 6 is in the first position. The limiter 6 is configured not to engage with the slider 3 when the limiter 6 is in the first position.

[0052] like Figure 15 As shown, the front first protrusion 64a1 and the front second protrusion 64a2 of the limiter 6 are configured such that they do not engage with the front first protrusion 32a1 and the front second protrusion 32a2 when the limiter 6 is positioned in the first position. Specifically, the front first protrusion 64a1 and the front second protrusion 64a2 are configured such that when the limiter 6 is positioned in the first position, they are located at a position further forward than the front first protrusion 32a1 and the front second protrusion 32a2.

[0053] The first protrusion 33b1 protrudes from the root 33a into the groove 49 along the first sidewall portion 43b1. The second protrusion 33b2 protrudes from the root 33a into the groove 49 along the second sidewall portion 43b2. The intermediate first convex portion 33d1 engages with the first concave portion 43c1. The intermediate second convex portion 33d2 engages with the second concave portion 43c2. The other protrusion 63 protrudes from the base 61 (see reference). Figure 13 It protrudes between the first protrusion 33b1 and the second protrusion 33b2.

[0054] When the limiter 6 is positioned in the first position, the other protrusion 63 is positioned further from the root 33a than the intermediate first protrusion 33d1 and intermediate second protrusion 33d2, thereby releasing the engagement between the intermediate first protrusion 33d1 and the first recess 43c1, and the intermediate second protrusion 33d2 and the second recess 43c2. The slider 3 is configured to deform in such a way that the intermediate first protrusion 33d1 disengages from the first recess 43c1 when the limiter 6 is positioned in the first position. The slider 3 is also configured to deform in such a way that the intermediate second protrusion 33d2 disengages from the second recess 43c2 when the limiter 6 is positioned in the first position. Specifically, the first protrusion 33b1 and the second protrusion 33b2 are configured to deform in such a way that they approach each other at the positions of the intermediate first protrusion 33d1 and the intermediate second protrusion 33d2 when the limiter 6 is positioned in the first position. The other protrusion 63 is configured such that, when the limiter 6 is in the first position, it is positioned further forward than the middle first protrusion 33d1 and the middle second protrusion 33d2.

[0055] <Structure of utility knife 100 when limiter 6 is configured in the second position> Next, use Figure 16 The structure of the utility knife 100 when the limiter 6 is configured in the second position will be described in detail. Figure 16 This is a partial cross-sectional view showing the structure of the utility knife 100 with the limiter 6 in the second position. For ease of explanation, in... Figure 16 The diagram shows the first part 31 of the slider 3 (see reference). Figure 8 ) and the base 61 of the limiter 6 (refer to Figure 12 ).

[0056] The main body 2 is configured to house the entire blade when the limiter 6 is in the second position. Therefore, the utility knife 100 is in an unused state when the limiter 6 is in the second position. The sliding member 3 is configured to remain in place without detaching from the cap 4 when the limiter 6 is in the second position. The limiter 6 is configured to engage with the sliding member 3 when the limiter 6 is in the second position.

[0057] like Figure 16 As shown, the front first protrusion 64a1 of the limiter 6 is configured to engage with the front first protrusion 32a1 and the rear first protrusion 32b1 when the limiter 6 is positioned in the second position. Specifically, the front first protrusion 64a1 is configured to be clamped by the front first protrusion 32a1 and the rear first protrusion 32b1 in the first direction DR1 when the limiter 6 is positioned in the second position. Furthermore, the front second protrusion 64a2 of the limiter 6 is configured to engage with the front second protrusion 32a2 and the rear second protrusion 32b2 when the limiter 6 is positioned in the second position. Specifically, the front second protrusion 64a2 is configured to be clamped by the front second protrusion 32a2 and the rear second protrusion 32b2 in the first direction DR1 when the limiter 6 is positioned in the second position.

[0058] When the limiter 6 is positioned in the second position, the engagement between the intermediate first protrusion 33d1 and the first recess 43c1 and the intermediate second protrusion 33d2 are maintained by the other protrusion 63 being clamped by the intermediate first protrusion 33d1 and the intermediate second protrusion 33d2. The intermediate first protrusion 33d1 of the slider 3 is configured not to disengage from the first recess 43c1 when the limiter 6 is positioned in the second position. The intermediate second protrusion 33d2 of the slider 3 is configured not to disengage from the second recess 43c2 when the limiter 6 is positioned in the second position. Specifically, the limiter 6 is configured such that, when the limiter 6 is positioned in the second position, the other protrusion 63 is positioned between the intermediate first protrusion 33d1 and the intermediate second protrusion 33d2. Thus, the first protrusion 33b1 and the second protrusion 33b2 of the slider 3 are configured such that they will not deform in a manner that brings the middle first protrusion 33d1 and the middle second protrusion 33d2 closer to each other when the limiter 6 is positioned in the second position.

[0059] <Structure of utility knife 100 when limiter 6 is configured in the third position> Next, use Figures 17-20 The structure of the utility knife 100 with the limiter 6 in the third position is described in detail. Figure 17 This is a partial cross-sectional view showing the structure of the utility knife 100 with the limiter 6 in the third position. For ease of explanation, in... Figure 17 The first part 31 of the slider 3 is not shown in the figure (see reference). Figure 8 ) and the base 61 of the limiter 6 (refer to Figure 12 ). Figure 18 yes Figure 3 A magnified view of the XVIII region. Figure 19 This describes the structure of the utility knife 100 when the engagement between the hinge 8 and the cap 4 is released. Figure 19 Is with Figure 18 The corresponding sectional view. In Figure 19 In the middle, lever 7 is positioned in a fixed position. Figure 20 This describes the structure of the utility knife 100 when the lever 7 is in the movable position. Figure 20 Is with Figure 18 The corresponding sectional view. For ease of explanation, in... Figures 18 to 20 The elastomer 5 is not illustrated in the diagram (see reference). Figure 3 ).

[0060] like Figure 17As shown, the front first protrusion 64a1 and front second protrusion 64a2 of the limiter 6 are configured such that they do not engage with the slider 3 when the limiter 6 is positioned in the third position. Specifically, the front first protrusion 64a1 is configured such that, when the limiter 6 is positioned in the third position, it is located further rearward than the rear first protrusion 32b1 in the first direction DR1. The front second protrusion 64a2 is configured such that, when the limiter 6 is positioned in the third position, it is located further rearward than the rear second protrusion 32b2 in the first direction DR1.

[0061] When the limiter 6 is positioned in the third position, the engagement of the intermediate first protrusion 33d1 with the first recess 43c1 and the engagement of the intermediate second protrusion 33d2 with the second recess 43c2 are maintained by the other protrusion 63 being positioned opposite the root 33a to the intermediate first protrusion 33d1 and the intermediate second protrusion 33d2. The slider 3 is configured not to disengage from the cap 4 when the limiter 6 is positioned in the third position. Specifically, the intermediate first protrusion 33d1 of the slider 3 is configured not to deform in a manner that would disengage from the first recess 43c1 when the limiter 6 is positioned in the third position. Furthermore, the intermediate second protrusion 33d2 is configured not to deform in a manner that would disengage from the second recess 43c2 when the limiter 6 is positioned in the third position. More specifically, the first protrusion 33b1 and the second protrusion 33b2 are configured such that, when the limiter 6 is positioned in the third position, they do not deform in a manner that brings them closer together at the positions of the intermediate first protrusion 33d1 and the intermediate second protrusion 33d2. The other protrusion 63 is configured such that, when the limiter 6 is positioned in the third position, it is located further rearward than the intermediate first protrusion 33d1 and the intermediate second protrusion 33d2.

[0062] <The Actions of Using a Utility Knife 100> Next, use Figures 3-7 and Figures 15-18 The operation of the utility knife 100 is explained. Figure 18 This is a partial cross-sectional view showing the limiter 6 configured in the second position. Figure 18 In the middle, hinge 8 is engaged with cap 4. Figure 19 This is a partial cross-sectional view showing the limiter 6 configured in the third position. Figure 19 In the middle, the engagement between hinge 8 and cap 4 is released. Figure 18 and Figure 19 In the middle, lever 7 is positioned in a fixed position. Figure 20 This is a partial cross-sectional view showing the limiter 7 in the movable position. Figures 18-20 and Figure 3 The XVIII region corresponds to this.

[0063] like Figure 4As shown, in the usage state, the blade 1 protrudes from the body 2. Therefore, the user of the utility knife 100 can cut the object by using the blade 1.

[0064] The limiter 6 is positioned in the first position during use. Therefore, the slider 3 can move relative to the cap 4 during use. Figure 3 and Figure 4 As shown, the slider 3 in the use state is positioned further forward than the slider 3 in the non-use state. By applying force to the elastic body 5, the slider 3 is moved rearward from its protruding position to its stored position. That is, by moving the slider 3 rearward under the force of the elastic body 5, the utility knife 100 is switched from the use state to the non-use state. Therefore, the user of the utility knife 100 can switch the utility knife 100 from the use state to the non-use state by removing their hand from the slider 3 of the utility knife 100 in the use state.

[0065] like Figure 5 As shown, when the limiter 6 is in the second position, the slider 3 does not move relative to the cap 4. Therefore, the user of the utility knife 100 cannot move the slider 3 forward relative to the cap 4. Thus, the user of the utility knife 100 can maintain the blade 1 in a non-use state with the main body 2 stored inside. Therefore, the user of the utility knife 100 can safely operate the utility knife 100. For example, the user of the utility knife 100 can safely store the utility knife 100 in their pocket.

[0066] When the limiter 6 is positioned in the first or second position, the lever 7 is positioned in the fixed position. When the lever 7 is positioned in the fixed position by rotating relative to the main body 2 via the first arm 72a and the second arm 72b, the cap 4 is clamped together with the main body 2 by the body 71, thus fixing the cap 4 relative to the main body 2. When the lever 7 is positioned in the fixed position, the cap 4 does not move relative to the main body 2.

[0067] like Figure 6 and Figure 7 As shown, with the limiter 6 in the third position, the lever 7 can move from the fixed position to the movable position. Therefore, the user of the utility knife 100 can move the lever 7 to the movable position. When the lever 7 is positioned in the movable position by rotating relative to the main body 2 via the first arm 72a and the second arm 72b, the cap 4 is not clamped together with the main body 2, allowing the cap 4 to move relative to the main body 2. With the lever 7 in the movable position, the cap 4 can move relative to the main body 2. Thus, the user of the utility knife 100 can pull the cap 4 from the main body 2 to the rear.

[0068] like Figure 15 and Figure 16As shown, the slider 3 moves from the first position to the second position via the limiter 6, causing the slider 3 to engage with the limiter 6. Therefore, the slider 3 remains stationary relative to the cap 4. Figure 16 and Figure 17 As shown, when the limiter 6 moves from the second position to the third position, the cap 4 can move relative to the body 2.

[0069] like Figure 18 and Figure 19 As shown, the lever 7 is released from the hinge 8 by moving from the second position to the third position via the limiter 6. Specifically, the limiter 6 is moved from the second position to the third position so that it contacts the hinge 8. The limiter 6 contacts the first end 81 of the hinge 8. Through the contact between the limiter 6 and the hinge 8, the hinge 8 deforms in a way that moves the first end 81 of the hinge 8 rearward. Through the movement of the hinge 8, the first end 81 is disengaged from the cap 4. Thus, the engagement between the hinge 8 and the cap 4 is released. Therefore, as... Figure 20 As shown, lever 7 rotates from a fixed position to a movable position. The user of utility knife 100 can rotate lever 7 from the fixed position to the movable position. As a result, cap 4 can move relative to body 2.

[0070] In summary, as Figure 7 As shown, by moving the limiter 6 to the third position to move the lever 7 to the movable position, the user of the utility knife 100 can pull the cap 4 out of the main body 2. The cap 4 can be integrated with the blade 1, the slider 3, the elastic body 5, and the limiter 6 and pulled out of the main body 2. Thus, the blade 1 pulled out of the main body 2 can be replaced with another blade 1.

[0071] Next, the effects of this embodiment will be explained. According to the utility knife 100 of embodiment 1, such as Figure 3 and Figure 4 As shown, the cap 4 is in use with the slider 3 positioned in the protruding position (refer to...). Figure 4 The usage state of the part where the sliding member 3 is positioned in the storage position (see reference). Figure 3 It is fixed to the rear end 21b. (For example...) Figure 3 As shown, the slider 3 reaches the rear end 21b when not in use. Therefore, when not in use, the blade 1 does not protrude from the front end 21a towards the outside of the body 2.

[0072] like Figure 1 As shown, when the limiter 6 is in the first position, the slider 3 is not fixed to the cap 4, as... Figure 5As shown, when the limiter 6 is in the second position, the slider 3 is fixed to the cap 4. Therefore, by moving the limiter 6 to the first or second position, the state in which the slider 3 is not fixed to the cap 4 and the state in which the slider 3 is fixed to the cap 4 can be switched. Thus, when the user of the utility knife 100 is using the utility knife 100, by moving the slider 3 to the first position, the slider 3 can be moved to the protruding position, and the utility knife 100 can be used. That is, by moving the slider 3 to the first position, the utility knife 100 can be put into use. Furthermore, when the user of the utility knife 100 is not using the utility knife 100, by moving the slider 3 to the second position, the slider 3 can be fixed to the storage position. That is, by moving the slider to the second position, the utility knife 100 can be put into a non-use state. Therefore, it is possible to prevent the blade 1 from accidentally protruding from the main body 2. Therefore, for example, when the user of the utility knife 100 has the utility knife 100 in their pocket, the utility knife 100 can be safely stored in their pocket.

[0073] like Figure 15 As shown, when the limiter 6 is positioned in the first position, the other protrusion 63 is positioned further from the root 33a than the middle first protrusion 33d1 and the middle second protrusion 33d2. This releases the engagement between the middle first protrusion 33d1 and the first recess 43c1, and the engagement between the middle second protrusion 33d2 and the second recess 43c2. Figure 16 As shown, when the limiter 6 is positioned in the second position, the other protrusion 63 is clamped by the middle first protrusion 33d1 and the middle second protrusion 33d2, thereby maintaining the engagement of the middle first protrusion 33d1 with the first recess 43c1 and the engagement of the middle second protrusion 33d2 with the second recess 43c2. Therefore, the engagement between the slider 3 and the cap 4 can be switched by moving the limiter 6.

[0074] like Figure 1 As shown, with lever 7 in a fixed position, cap 4 is fixed to body 2, as... Figure 7As shown, with lever 7 in the movable position, cap 4 is fixed to body 2. Therefore, by positioning lever 7 in either the fixed or movable position, the state where cap 4 is fixed to body 2 and the state where cap 4 is not fixed to body 2 can be switched. Thus, when the user of utility knife 100 uses the utility knife 100, positioning lever 7 in the fixed position secures cap 4 to body 2 and prevents cap 4 from detaching from body 2. This prevents cap 4 from detaching from body 2 in both the use and non-use states. Furthermore, when the user of utility knife 100 replaces blade 1, positioning lever 7 in the movable position allows cap 4, blade 1, slider 3, elastic body 5, and limiter 6 to be pulled out of body 2 together. Therefore, when cap 4 is removed from body 2, blade 1, slider 3, elastic body 5, and limiter 6 are removed as a single unit without falling apart. This allows for safe replacement of blade 1.

[0075] like Figure 3 As shown, when lever 7 is in a fixed position, lever 7 can rotate in a manner that makes its rotation direction orthogonal to the first direction DR1, and when lever 7 is in a fixed position, it does not move parallel to the first direction DR1. Therefore, lever 7 does not rotate when a force is applied to lever 7 along the first direction DR1. Thus, even if the slider 3 is subjected to force along the first direction DR1 from the front end 21a to the rear end 21b under the elastic force of the elastic body 5 and collides with the cap 4, lever 7 will not rotate. Therefore, even if the slider 3 collides with the cap 4, the cap 4 can be prevented from falling off. Furthermore, since the cap 4 can be prevented from falling off, the blade 1 can also be prevented from falling off the body 2. Thus, the blade 1 can be safely stored.

[0076] like Figure 1 As shown, when the lever 7 is positioned in a fixed position by rotating relative to the main body 2 via the first arm 72a and the second arm 72b, the cap 4 is clamped together with the main body 2 by the body 71, and the cap 4 is fixed relative to the main body 2, as shown. Figure 7 As shown, when the first arm 72a and the second arm 72b rotate relative to the main body 2 and the lever 7 is positioned in a movable position, the cap 4 is movable relative to the main body 2 because the body 71 does not clamp the cap 4 together with the main body 2. Therefore, by rotating the lever 7, the fixation of the cap 4 relative to the main body can be maintained or released.

[0077] like Figure 19As shown, the hinge 8 is configured such that, when in contact with the limiter 6 in the third position, it deforms due to contact with the limiter 6, thereby releasing its engagement with the cap 4. The lever 7 is configured to rotate from a fixed position to a movable position by moving the limiter 6 from the first or second position to the third position. Therefore, the lever 7 can be released from its fixed position simply by moving the limiter 6. As a result, the blade 1 can be easily replaced because the lever 7 can be easily released from its fixed position. Furthermore, the lever 7 will not be released from its fixed position as long as the limiter 6 does not move to the third position. This prevents the lever 7 from being suddenly released from its fixed position in both the use and non-use states, and thus prevents the cap 4 from being suddenly pulled out. Therefore, the utility knife 100 can be used more safely. In addition, the blade 1 can only be replaced when the limiter 6 is in the third position. When the limiter 6 is in the third position, the slider 3 is in the retracted position. Therefore, the blade 1 can only be replaced when the slider 3 is in the retracted position.

[0078] Implementation Method 2 Next, use Figure 21 The structure of the utility knife 100 in Embodiment 2 will be described. Unless otherwise specified, Embodiment 2 has the same structure and effect as Embodiment 1 described above. Therefore, the same symbols are used to mark the same structures as in Embodiment 1, and the description will not be repeated.

[0079] like Figure 21 As shown, in the utility knife 100 of this embodiment, the hinge 8 is configured to be separate from the lever 7. Figure 21 Is with Figure 18 The corresponding enlarged image. For clarity, in... Figure 21 The figure shows elastomer 5 (refer to the diagram). Figure 3 The hinge 8 is, for example, made of sheet metal. The second end 82 of the hinge 8 is fixed to the lever 7 in a detachable state relative to the lever 7. The hinge 8 is fixed to the lever 7, for example, by a screw 83. For example, the second end 82 of the hinge 8 is fixed to the lever 7 by a screw 83.

[0080] Next, the effects of this embodiment will be explained. According to the utility knife 100 of embodiment 2, such as Figure 21As shown, hinge 8 is configured to be separate from lever 7. Hinge 8 deforms due to elastic deformation, and therefore is prone to deterioration. Assuming that hinge 8 and lever 7 are integrally formed, hinge 8 may break due to deterioration of the material (e.g., resin) constituting hinge 8 and lever 7, thus allowing it to separate from lever 7. In this case, utility knife 100 becomes unusable. In contrast, according to this embodiment, hinge 8 is configured to be separate from lever 7, so even if hinge 8 breaks, it can be replaced with an undamaged hinge 8. Therefore, replacing hinge 8 can prevent utility knife 100 from becoming unusable.

[0081] It should be considered that the embodiments of this invention are illustrative rather than restrictive in all respects. The scope of the invention is defined by the claims rather than by the foregoing description, and is intended to include all changes within the meaning and scope equivalent to the claims. (Symbol Explanation)

[0082] 1 Blade; 2 Body; 3 Slider; 4 Cap; 5 Elastomer; 6 Limiter; 7 Lever; 8 Hinge; 21a Front end; 21b Rear end; 33a Root; 33b1 First protrusion; 33b2 Second protrusion; 33d1 Middle first convex part; 33d2 Middle second convex part; 42b1 First sidewall part; 42b2 Second sidewall part; 42c1 First recess; 42c2 Second recess; 49 Groove; 64 Base; 63 Protrusion on the other side; 71 Body part; 72a First arm part; 72b Second arm part; 100 Utility knife; DR1 First direction.

Claims

1. A utility knife, characterized in that, include: A main body having a front end and a rear end opposite to the front end; A slider is configured to hold the blade inside the body and to be movable inside the body between a protruding position and a retracted position, wherein the blade protrudes from the front end in the protruding position and is retracted between the front end and the rear end in the retracted position. A cap, the cap being able to be secured to the rear end; as well as An elastomer that connects the slider to the cap. The cap is fixed to the rear end in the use state when the slider is positioned in the protruding position and in the non-use state when the slider is positioned in the storage position. The elastomer applies force to the slider toward the cap in both the used state and the unused state. The slider reaches the rear end in the non-use state. The utility knife also includes a limiter. The limiter is movably mounted on the slider relative to the slider, and is configured to move between a first position and a second position. When the limiter is positioned in the first position, the slider is not fixed to the cap. When the limiter is positioned in the second position, the slider is fixed to the cap.

2. The utility knife as described in claim 1, characterized in that, The cap is provided with a groove. The groove has: a first sidewall portion; a second sidewall portion, the second sidewall portion being spaced apart from the first sidewall portion and facing the first sidewall portion; and a first recess portion, the first recess portion being recessed from the first sidewall portion toward a side opposite to the second sidewall portion. And a second recess, the second recess being configured to be recessed from the second sidewall portion toward a side opposite to the first sidewall portion. The slider has: a root; a first protrusion that protrudes from the root along the first sidewall portion into the groove; A second protrusion extends from the root into the groove along the second sidewall portion; A first central protrusion, which is connected to the first protrusion and engages with the first recess; and a second central protrusion, which is connected to the second protrusion and engages with the second recess. The limiter includes a base and a protrusion on another side extending from the base between the first protrusion and the second protrusion. When the limiter is positioned in the first position, the other protrusion is positioned further from the root than the first and second intermediate protrusions, thereby releasing the engagement between the first intermediate protrusion and the first recess, and the engagement between the second intermediate protrusion and the second recess. When the limiter is positioned in the second position, the other side protrusion is clamped by the middle first protrusion and the middle second protrusion, maintaining the engagement of the middle first protrusion with the first recess and the engagement of the middle second protrusion with the second recess.

3. The utility knife as described in claim 1 or 2, characterized in that, The utility knife also includes a lever. The lever is rotatably mounted on the main body relative to the main body, and is configured to rotate between a fixed position and a movable position. With the lever positioned in the fixed position, the cap is fixed to the main body. When the lever is positioned in the fixed position, the lever can rotate in a direction orthogonal to a first direction from the rear end to the front end, and cannot move parallel to the first direction. With the lever positioned in the movable position, the cap is not fixed to the main body.

4. The utility knife as described in claim 3, characterized in that, The lever includes: a first arm, mounted to be rotatable relative to the body; a second arm, mounted on a side opposite to the first arm relative to the body, rotatable relative to the body; and a body connecting the first arm and the second arm. When the lever is positioned in the fixed position by rotating the first and second arms relative to the main body, the cap is fixed relative to the main body because the body and the main body together clamp the cap. When the lever is positioned in the movable position by rotating the first arm and the second arm relative to the main body, the cap is movable relative to the main body because the body does not clamp the cap together with the main body.

5. The utility knife as described in claim 3, characterized in that, The utility knife also includes a hinge. The hinge is mounted on the lever and is deformable. The hinge is configured to engage with the cap when the lever is positioned in the fixed position. The lever is configured to be fixed in the fixed position by engaging the hinge with the cap. The limiter is configured to move to a third position where it contacts the hinge. The hinge is configured to engage with the cap when the limiter is positioned in the first or second position. The hinge is configured such that, when it is positioned in the third position via the limiter and in contact with the hinge, it deforms due to contact with the limiter, thereby releasing its engagement with the cap. The lever is configured such that it can be moved from the first position or the second position to the third position via the limiter and can be rotated from the fixed position to the movable position.

6. The utility knife as described in claim 4, characterized in that, The utility knife also includes a hinge. The hinge is mounted on the lever and is deformable. The hinge is configured to engage with the cap when the lever is positioned in the fixed position. The lever is configured to be fixed in the fixed position by engaging the hinge with the cap. The limiter is configured to move to a third position where it contacts the hinge. The hinge is configured to engage with the cap when the limiter is positioned in the first or second position. The hinge is configured such that, when it is positioned in the third position via the limiter and in contact with the hinge, it deforms due to contact with the limiter, thereby releasing its engagement with the cap. The lever is configured such that it can be moved from the first position or the second position to the third position via the limiter and can be rotated from the fixed position to the movable position.

Images