JP2012090860A - Retractable knife - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retractable knife, which is locked and unlocked only by giving operation force in the direction in which a retractable knife blade appears/disappears and which also secures a strong locked state.SOLUTION: A guide member 13 is stored in a case 12, and in the guide member 13, a slider 15 for holding a retractable knife blade 14 is stored so as to move back and forth. The slider 15 is provided with a leaf spring 17. The leaf spring 17 is placed so as to be extended in the back-and-forth direction between a slider body 42 and the operation member 44, and is provided with a wing part 98 placeable between projection parts 36 which are provided respectively on both sides in the width direction of the guide member 13. While the wing part 98 is located between the projection parts 36 and the locking of the slider 15 is performed, when operation force in the back-and-forth direction is given to the operation member 44 to curve and deform the leaf spring 17, the wing part 98 is lifted and displaced between the projection parts 36 to perform unlocking.

Description

  The present invention relates to a cutter knife, and more particularly, to a cutter knife that can easily and reliably perform locking and releasing of a slider that allows a cutter blade to move in and out.

  For example, as disclosed in Patent Document 1, a known cutter knife is a substantially C-shaped case extending in the front-rear direction, a slider provided to be movable in the front-rear direction in the case, and held by the slider. And a cutter blade. A locking mechanism is interposed between the slider and the case. This locking mechanism allows the cutter blade to protrude stepwise from the front end of the case, while maintaining the cutter blade at a fixed stop position. ing.

  This type of cutter knife has the slider located on the side of the case and can be easily operated with the thumb of the right hand when used by a right-handed person. Convenience is very bad.

  Therefore, for example, as disclosed in Patent Document 2, the present applicant has proposed a so-called universal type cutter knife that does not affect the dominant hand by disposing an operation member on the upper end portion of the case. This cutter knife engages and disengages a slider body including a slider main body located in the case and an operation member combined with the slider main body so as to be movable in the front-rear direction, and a leaf spring provided between the slider main body and the case. By being provided as possible, it is configured to include a lock mechanism for locking and unlocking the slider.

Japanese Utility Model Publication No. 57-128968 JP 2008-229076 A

The cutter knife described in Patent Document 2 locks and releases the bent portion provided in the leaf spring by engaging and disengaging the notched portion of the guide member located in the case, and strongly maintains the locked state. It does not stand in the design philosophy.
In this regard, the cutter knife described in Patent Document 1 allows the slider to be locked by positioning the protrusion provided on the thin piece portion of the slider within the notch portion of the guide member, and pressing the thin piece portion, This is a configuration in which the protrusion is escaped from the cutout portion to release the lock, and the locked state can be strongly secured as compared with the configuration of Patent Document 1.
However, in the cutter knife described in Patent Document 1, the direction in which the slider is operated is not the same as the direction in which the lock is released, and an operation force that moves the slider back and forth while pressing is required during operation. There are difficulties in operability.

[Object of invention]
The present invention has been devised by paying attention to such inconveniences, and the purpose of the present invention is to lock and release it only by applying an operating force in the direction in which the cutter blade is raised and retracted, and to strengthen the locked state. It is to provide a cutter knife that can be secured.

In order to achieve the above object, the present invention adopts the structure described in the claims. That is, a case having an inner space extending in the front-rear direction and having a slit connected to the inner space in the front-rear direction, and a cutter blade housed in the case and provided so that it can protrude from the front end of the case A slider provided to be movable in the front-rear direction within the case while holding the cutter blade, and attached to the slider and detachably provided on the case side to allow the slider to be locked and released. The slider is combined with a slider main body positioned in the case and a slider body that can move relative to the slider main body in the front-rear direction, and is positioned outside the case through the slit. In a cutter knife including
A guide member having a side wall surface that receives the slider and has convex portions formed at predetermined intervals along the longitudinal direction of the case is provided.
The leaf spring is disposed so as to extend in the front-rear direction between the slider main body and the operation member, and has a shape including an engaging portion that can be positioned between the convex portions,
While the engagement portion is positioned between the convex portions, the slider is locked,
A configuration in which when the operation force in the front-rear direction is applied to the operation member, the lock is released by changing the dimension of the leaf spring in the front-rear direction and the engaging portion is displaced upward between the convex portions. Adopted.

In the present invention, the leaf spring is provided in a longitudinally symmetrical shape with respect to the center in the front-rear direction, and the engaging portion is located between the convex portions with the center portion of the leaf spring expanding outward in the width direction. Consists of wings that engage the convex part,
When the operating force is applied to the operating member, the wing rises between the convex portions to release the lock, while when the operating force is released, the wing portion is positioned between the convex portions to perform locking. The configuration can be taken.

Further, the leaf spring is located between the plane portion and a pair of front and rear plane portions extending in the front-rear direction, a bent portion connected to the front end of the front side plane portion and the rear end of the rear side plane portion, and the plane portion. The center plane part lower than the plane position of the part and the wing part that protrudes so as to expand outward in the width direction of the center plane part to form the engaging part are employed.
At this time, when an operating force is applied to the operation member, the front and rear bent portions are angularly displaced and the flat surface portion is bent so that the engagement between the wing portion and the convex portion is released. be able to.

Further, the convex portions are respectively formed on the upper edges of the pair of side wall surfaces constituting the guide member, and the wing portions are arranged in a pair in the width direction so as to be formed on the convex portions on the upper edges of the pair of side wall surfaces. It is configured to be provided so as to engage each other.
Here, the operation member includes a front rib that presses a bent portion that continues to the front portion side of the leaf spring, and a rear pressing rib that presses a bent portion that continues to the rear portion side of the leaf spring. And the rear pressing rib selectively presses the bent portion, so that the flat surface portion can be curved and the engagement between the wing portion and the convex portion can be released.

According to the present invention, the leaf spring changes its longitudinal dimension simply by applying an operation force in the front-rear direction to the operation member, and the engagement between the engagement portion and the convex portion is released. The direction of releasing the lock is common, and the convenience of operation can be given. Moreover, in a state where no operating force is applied to the operating member, the engaging portion is kept in a state of being located between the convex portions, so that the locked state can be strongly maintained.
In addition, since the leaf springs are provided in a symmetrical shape, the same deformation is caused when the operation member is operated before or after, and the locking and releasing operation can be stably performed.
Further, since the wing portion constituting the engagement portion is formed so as to protrude the center flat portion of the leaf spring to the outside in the width direction, the wing portion is located in the front-rear direction with the wing portion positioned between the convex portions. Therefore, the locked state can be strongly secured. On the other hand, when the operating member is operated, the wing portion position is lifted and displaced between the convex portions through the curved deformation of the flat portion, so that the engagement can be released, and the unlocking can be performed smoothly.
Moreover, it becomes possible to keep a locked state still more firmly by setting it as the structure which wing parts are arrange | positioned by a width direction pair, and these wing parts each engage / disengage from the convex part of a guide member.

The schematic perspective view of the cutter knife which concerns on this embodiment. The disassembled perspective view of the said cutter knife. The top view which shows the state which accommodated the guide member in the case. (A) is a longitudinal cross-sectional view of FIG. (B) is an expanded sectional view which follows the AA line of FIG. 4 (A). (A) is a top view of a guide member, (B) is a center sectional view of a guide member. The schematic perspective view which shows the state which made the slider hold | maintain the cutter blade. (A) is a front view of a slider main body, (B) is the top view, (C) is the back view. (A) is the BB sectional view taken on the line of FIG. 7 (A), (B) is the CC sectional view, and (C) is the CD sectional view. (A) is the EE sectional view taken on the line of FIG. 7 (A), (B) is the FF sectional view, and (C) is the GG expanded sectional view. (A) is a front view of a pressing member, (B) is a rear view thereof, and (C) is a plan view thereof. 10A is a left side view of FIG. 10B, FIG. 10B is a sectional view taken along line MM, and FIG. 10C is an enlarged sectional view taken along line NN. (A) is a front view of the operation member, (B) is a left side view of (A), (C) is a rear view of the operation member, and (D) is a plan view of the operation member. 12A is a cross-sectional view taken along the line HH of FIG. 12A, FIG. 12B is a cross-sectional view taken along the line II, FIG. 12C is a cross-sectional view taken along the line JJ, and FIG. Sectional drawing and (E) are the LL line sectional drawings. (A) is a front view of a leaf | plate spring, (B) is the top view, (C) is the side view. Action | operation explanatory drawing which mounts a cutter blade in a slider main body. Action | operation explanatory drawing which shows the state which pressed the cutter blade with the pressing member. Action | operation explanatory drawing which shows the state which mounted | wore with the leaf | plate spring member in the slider main body. Operation | movement explanatory drawing which shows a lock | rock and its cancellation | release.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this specification, “front” is used for the side where the tip of the cutter blade is located, while “rear” is used for the opposite side.

  1 and 2, the cutter knife 10 includes a case 12 having an inner space S (see FIG. 4B) extending in the front-rear direction, a guide member 13 accommodated in the case 12, and the guide member 13. The cutter blade 14 is provided so as to be movable in the front-rear direction along the front end of the case 12, and is capable of moving along the guide member 13 together with the cutter blade 14 while holding the cutter blade 14. And a leaf spring 17 which is provided between the slider 15 and the case 12 and which is detachably provided on the case 12 side and constitutes a lock mechanism for locking and releasing the slider 15. And is configured.

  The case 12 has an elongated shape that extends in the front-rear direction and can be held in the palm of the hand. The case 12 includes a bottom wall 20 extending in the front-rear direction, a pair of side wall surfaces 21 continuous in the short width direction of the bottom wall 20, and a top wall 22 continuous between the upper portions of the side wall surfaces 21. The front end and the rear end of the case 12 are open, and a cap 23 is attached to the front end and a tail plug 25 is detachably attached to the rear end. As shown in FIG. 3 and FIG. 4 (B), the slit 27 connected to the inner space S is located at a position slightly shifted from the rear end to the front end portion at a position slightly shifted to the side wall surface 21 side. Is formed. Further, a vertical hole 28 is formed on the front end surface of the cap 23 for projecting the tip end region of the guide member 13. A window hole 29 extending in the front-rear direction is formed in a region extending between the side wall surface 21 and the side surface of the cap 23 so that the remaining length of the cutter blade 14 located inside can be visually recognized through the window hole 29. It has become. The case 12 in this embodiment is integrally molded using an appropriate resin material, but is molded as a two-part mold having an intermediate position in the thickness direction (a direction perpendicular to the surface of the side wall surface 21) as a mating surface. Alternatively, the cap 23 can be formed integrally with the case 12.

  As shown in FIG. 4, the upper surface side of the rear end portion of the bottom wall 20 is a lower bottom wall 20 </ b> A, and the side surface 21 in the region of the rear bottom wall 20 </ b> A has front and rear surfaces. A groove 30 extending in the direction is formed, and a protrusion 31 formed on the tail plug 25 can be fitted into the groove 30. The tail plug 25 has a closed surface with a curved rear end, and a slit 32 connected to the slit 27 formed on the top wall 22 is formed on the upper end surface.

  The cutter blade 14 has the same structure as a known cutter blade with a tip and a rear end inclined with respect to the extending direction of the blade edge to form a substantially parallelogram-like plate shape in plan view and provided with a hole 14A in the rear portion. Is used.

  As shown in FIG. 5, the guide member 13 is connected to the base surface 34 facing the bottom wall 20 and the side wall surface 21 of the case 12 substantially in parallel, and both sides of the base surface 34 in the short width direction. It includes a pair of side wall surfaces 35 that are directed substantially vertically upward and that form a surface substantially parallel to the cutter blade 14. The front end side of the side wall surface 35 is set to an inclined surface portion 35A in which the mutual separation width is gradually narrowed, and a gap that guides the passage of the cutter blade 14 in a substantially straight line within the vertical plane, connected to the front end of the inclined surface portion 35A. The parallel surface portion 35 </ b> B penetrates the vertical hole 28 formed in the front wall 23 of the case 12 and protrudes forward.

  At the upper end portions of the pair of side wall surfaces 35, notches 37 are formed at a constant pitch along the front-rear direction, and convex portions 36 are formed between the notches 37, and further at the front position. Is provided with a tongue portion 38 projecting rearward and upward. The tongue piece 38 determines the insertion limit when the guide member 13 is inserted from the rear end in the case 12. An inner window hole 39 that extends in the front-rear direction and overlaps the window hole 29 of the case 12 is formed in the front region of the side wall surface 35. Note that the upper front and rear corners of the convex portion 36 are obliquely chamfered.

  The slider 15 is configured to detachably hold the cutter blade 14. As shown in FIG. 2, the slider 15 includes a slider body 42 having a protrusion 41 that fits in a hole 14 </ b> A formed in the rear part of the cutter blade 14, and the slider body 42 interacts with the slider body 42. 14 includes a pressing member 43 provided so as to sandwich the rear end portion thereof, and an operation member 44 combined with the slider main body 42 so as to be relatively movable in the front-rear direction.

  The slider main body 42 is provided with an outer shape that is substantially parallel to the surface of the cutter blade 14 and has a substantially plate shape in plan view extending in the front-rear direction. As shown in FIGS. 6 to 9, the slider body 42 is positioned along one surface of the rear end portion of the cutter blade 14, and the holding surface portion 46 in which the protrusion 41 is integrally provided, The operation member 44 is attached to the rear portion of the holding surface portion 46 and an attachment portion 47 for positioning the latter half portion of the pressing member 43. The holding surface portion 46 is formed with an inclined raised portion 46A on the inner surface side, and an upper horizontal portion 46B is formed on the upper portion. The inclined raised portion 46A regulates the rear end position of the cutter blade 14 corresponding to the shape of the rear end edge of the cutter blade 14, while the upper horizontal portion 46B is engaged with the upper edge of the rear end of the cutter blade 14 and the cutter. It acts as a rotation restricting portion when the blade 14 is temporarily held. Here, a bearing portion 48 that swingably supports the pressing member 43 is formed at a position rearward of the inclined raised portion 46A.

  The mounting portion 47 includes an upper surface portion 49 and a lower surface portion 50 that are continuous with the rear portion of the holding surface portion 46, and a front surface portion 51 between the upper surface portion 49 and the lower surface portion 50. On the upper surface portion 49, concave portions 49A are formed at two locations on the front and rear sides. In the plane of the front portion 51, a spring mounting portion 52 is provided on the upper rear side, and slot holes 55 directed in the front-rear direction are provided at two places in the front-rear direction below. The spring mounting portion 52 is substantially symmetric to the front bulge portion 58 connected to the upper end of the inclined bulge portion 46A on the L-shape via the horizontal bulge portion 57 and the front bulge portion 58 at the rear end portion of the front portion 51. It includes a rear bulge 59 and a horizontal bulge 60 that is positioned between the front and rear L-shaped bulges 58 and 59 and that forms a gap C1 between the bulge 58 and 59 in the front and rear. Here, a square hole 51A is formed in the front portion 51 above the central portion of the horizontal ridge 60, while a U-shaped notch is formed in the front portion 51 below the horizontal ridge 60. Thus, a plate member 62 is formed so that the surface position can be displaced.

As shown in FIGS. 10 and 11, the pressing member 43 includes a main body surface 63 located across the holding surface portion 46 and the mounting portion 47, and a pressing force continuous to the right side of the main body surface 63 in FIG. 10A. And an operation surface 64. The left end side of the main body surface 63 in FIG. 10A is a pressing surface 63A in which a notch 63B for receiving the protrusion 41 of the slider main body 42 is formed, and the central portion of the pressing operation surface 64 is at the slider main body 42. A substantially semicircular ring portion 65 that fits the provided bearing portion 48 is provided, and convex portions 66 are provided on both sides of the ring portion 65 in the left-right direction. Further, a protrusion 64 </ b> A that contacts the plate member 62 of the slider body 42 is formed on the right end side in FIG. 10C of the pressing operation surface 64. Note that raised portions 63C extending in the front-rear direction are formed at two upper and lower portions of the pressing surface 63A.
The pressing member 43 is swingable about the axis of the ring portion 65 as a rotation center by pressing the outer surface side of the pressing operation surface 64 with a fingertip while being combined with the slider body 42. Accordingly, the front end side of the main body surface 63, that is, the pressing surface 63A side where the notch portion 63A is formed is displaced in a direction in which the holding surface portion 46 of the slider main body 42 is separated and approached, whereby the cutter blade 14 can be attached and detached. .

  As shown in FIGS. 2, 12, and 13, the operation member 44 includes protrusions 72 </ b> A that extend in the front-rear direction along the top wall 22 of the case 12 and extend in the front-rear direction at two positions on the lower surface side. The operation plane 72 provided, a connection piece 73 that is connected to the upper surface of the operation plane 72 on one end side in the short width direction, and is positioned so as to penetrate the slit 27 of the case 12, and the connection piece A finger rest 74 provided in a substantially cantilever posture via 73 and a hanging portion opposed to the mounting portion 47 of the slider main body 42 connected to the other end in the short width direction of the operation plane 72. 76 and a claw-piece-shaped insertion piece portion 77 that is provided at two positions in the front and rear in the surface of the hanging portion 76 and is inserted into the slot hole 55 of the slider main body 42 so as not to fall off. As shown in FIG. 12 (A), the rear end of the drooping portion 76 has a length that is located rearward of the rear end of the operation plane 72 and is provided with a dimension that increases the vertical width. Further, a rear end wall portion 78 (see FIG. 12C) and a rear pressing rib 79 connected to the front side of the rear end wall portion 78 are provided. In addition, the length of the protrusion 72A provided on the lower surface side of the operation plane 72 and the length of the insertion piece 77 in the front-rear direction are longer than the length of the recess 49A and the slot hole 55 provided in the slider body 42. A difference is provided such that the operation member 44 can be combined with the slider main body 42 so that it cannot be detached and can be relatively moved along the front-rear direction. Here, the difference in length is set to a difference in which the leaf spring 17 generates a deformation necessary for unlocking when the operation member 44 is moved relative to the slider body 42.

In the drooping portion 76, a front rib 80 and a central rib 81 extending in the front-rear direction are disposed on substantially the same line as the insertion piece portion 77, as shown in FIGS. 12 (C) and 13 (B). The front rib 80 is provided to press the leaf spring 17 together with the rear pressing rib 79.
Further, a rectangular hole 83 extending in the front-rear direction is formed above the insertion piece portion 77 positioned in the front, and block pieces 84 directed in the front-rear direction are formed on both front and rear sides of the hole 83. Has been. In FIG. 12A, reference numerals 88 and 89 indicate holes provided for the convenience of forming the insertion piece 77 and the protrusion 72A. Of the front and rear holes 88, the front hole 88 is formed. The portion is a raised surface 90 in which the plate thickness of the hanging portion 76 is partially thick.

  As shown in FIGS. 2 and 14, the leaf spring 17 is connected to a pair of front and rear plane portions 92 and 93 extending in the front-rear direction, and a front end of the front side plane portion 92 and a rear end of the rear side plane portion 93. A center plane portion 97 located between the bent portions 95 and 96 and the plane portions 92 and 93, lower than the plane position of the plane portions 92 and 93, and so as to expand outward in the width direction of the center plane portion 97. And a pair of wings 98 that project to form an engaging portion. The flat portions 92 and 93 have a shape that is normally located on the same plane in a no-load state, and the bent portions 95 and 96 are substantially perpendicular to the surfaces of the flat portions 92 and 93.

  The cutter knife 10 according to the present embodiment has substantially the same configuration as the cutter knife disclosed in Japanese Unexamined Patent Application Publication No. 2008-229076 (Patent Document 1) except for the slider 15 except for the slider 15. It has become.

  Next, a method for assembling and using the cutter knife 10 in this embodiment will be described with reference to FIGS.

  First, the guide member 13 is inserted from the rear part of the case 12 and fitted into the inner space S to be fixed. On the other hand, in the slider 15, the pressing member 43, the leaf spring 17, and the operation member 44 are sequentially combined with the slider body 42. In this combination, first, the slider main body 42 is overlapped with the pressing member 43 opposed (see FIGS. 15 and 16), and the ring portion 65 of the pressing member 43 is forced to the bearing portion 48 on the slider main body 42 side. Fit into. Thereby, the pressing member 43 can move in the direction in which the protrusion 64A displaces the plate member 62 in the plate thickness direction and the pressing surface 63A side is separated from the holding surface portion 46 by pressing the pressing operation surface 64. On the other hand, by releasing the pressing of the pressing operation surface 64, it is possible to return to the original position by the elastic restoring force of the plate member 62 and to sandwich the rear end portion of the cutter blade 14 between the pressing surface 63A and the holding surface portion 46. It becomes.

  Next, the leaf spring 17 is attached to the spring attachment portion 52 of the slider body 42. In this mounting, the front side flat portion 92 and the rear side flat portion 93 of the leaf spring 17 are positioned on the horizontal raised portion 60 of the slider main body 42, and the bent portions 95 and 96 pass through the front and rear gaps C1. This is done to extend.

  The operating member 44 is combined with the slider body 42 in a state where the mounting of the leaf spring 17 is completed. This combination can be performed by inserting the insertion piece portions 77 provided in the hanging portion 76 of the operation member 44 into the slot holes 55 of the slider main body 42, respectively. When this insertion is performed, the protrusion 72A provided on the lower surface of the operation plane 72 of the operation member 44 is positioned in the corresponding recess 49A, and in the hole 83 provided in the surface of the hanging portion 76. One wing 98 is positioned. At this time, as shown in FIG. 18A, the leaf spring 17 is positioned between the slider body 42 and the operation member 44 while maintaining the initial shape.

  The unit in a state where the cutter blade 14 is held by the slider 15 is inserted into the case 12 with the tip end side of the cutter blade 14 as the tip end side in the insertion direction. At this time, the connecting piece 73 that supports the operation member 44 in a cantilevered posture is positioned in a state of vertically penetrating the slit 27 of the case body 12, and the finger contact portion 74 is positioned on the top wall 22. Then, the tail plug 25 is inserted and fitted into the rear end portion of the case 12, whereby the assembly of the cutter knife 10 can be completed.

  When the cutter blade 14 is protruded from the front end of the case 12, the fingertip is applied to the finger contact portion 74 at the initial position shown in FIG. 18A, and the operation member 44 is forward (leftward in the figure). It is only necessary to apply an operating force toward. As a result, the operating member 44 is moved forward relative to the leaf spring 17 attached to the slider main body 42 as shown in FIG. The ribs 79 press the rear bent portion 96. At this time, since the front bent portion 95 is in contact with the front rib 80, the leaf spring 17 is applied with force from both the front and rear sides while the front side flat portion 92 and the rear side flat portion 93 are curved. At this time, the wing portion 98 is displaced upward from the state in which the wing portion 98 is located in the notch portion 37 of the guide member 13, and the state of being engaged with the side edge of the convex portion 36 is released. Accordingly, the slider 15 moves forward in accordance with the operation direction applied to the operation member 44 and the cutter blade 14 is exposed for a predetermined length. When the operation force is released, the leaf spring 17 returns to the initial shape. Thus, the wing portion 98 is positioned in the notch 37 between the convex portions 36 to keep it in the locked position.

  When returning the cutter blade 14 into the case 12, an operating force may be applied backward to the operating member 44. As a result, the front rib 80 presses the bent portion 95 on the front side, so that the same displacement operation as described above is performed to allow the slider 15 to move backward, and when the operating force is released, it is locked again. Keep state.

  Therefore, according to such an embodiment, since the wing part 98 of the leaf spring 17 is located in the notch 37 between the convex parts 36, the wing part is kept in a state of being caught on the side end of the convex part 36. The locked state can be kept strong. Moreover, in order to release the locked state, it is only necessary to apply a force for moving the operation member 44 back and forth, so that the convenience of operation can be provided.

The best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this.
That is, the invention has been illustrated and described with particular reference to particular embodiments, but it should be understood that the above-described embodiments are not deviated from the technical idea and scope of the invention. On the other hand, those skilled in the art can make various modifications in shape, material, quantity, and other detailed configurations.
Therefore, the description limited to the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such is included in this invention.

  For example, the leaf spring 17 is not limited to the illustrated configuration example, and various shapes can be employed as long as substantially the same engagement is possible with respect to the convex portion of the guide member 13. Further, at least one of the wing parts 99 is sufficient.

DESCRIPTION OF SYMBOLS 10 Cutter knife 12 Case 13 Guide member 14 Cutter blade 15 Slider 17 Leaf spring 36 Convex part 42 Slider main body 44 Operation member 92,93 Plane part 95,96 Bending part 97 Central plane part 98 Wing part (engagement part)
S inner space

Claims (6)

A case having an inner space extending in the front-rear direction and having a slit connected to the inner space in the front-rear direction, a cutter blade housed in the case and provided so as to be able to protrude from the front end of the case, A slider that holds the cutter blade and is movable in the front-rear direction within the case, and a plate that is attached to the slider and detachably provided on the case side to allow the slider to be locked and released A slider main body positioned in the case, and an operating member positioned outside the case through the slit. Including cutter knife,
A guide member having a side wall surface that receives the slider and has convex portions formed at predetermined intervals along the longitudinal direction of the case is provided.
The leaf spring is disposed so as to extend in the front-rear direction between the slider main body and the operation member, and has a shape including an engaging portion that can be positioned between the convex portions,
While the engagement portion is positioned between the convex portions, the slider is locked,
When the operation force in the front-rear direction is applied to the operation member, the leaf spring changes the dimension in the front-rear direction, and the engagement portion is lifted and displaced between the convex portions to release the lock. Cutter knife to do. The leaf spring is provided in a longitudinally symmetrical shape with respect to the center in the front-rear direction, and the engaging portion is located between the convex portions with the central portion of the leaf spring expanding outward in the width direction, and is related to the convex portion. Consists of matching wings,
When operating force is applied to the operating member, the wing part rises between the convex parts to release the lock, and when the operating force is released, the wing part is positioned between the convex parts to perform locking. The cutter knife according to claim 1.   The leaf spring is located between the plane portion, a pair of front and rear plane portions extending in the front-rear direction, a bent portion continuing to the front end of the front side plane portion and the rear end of the rear side plane portion, and the plane portion. The center plane part lower than a plane position, and the wing | blade part which protrudes so that it may expand to the width direction outer side of the said center plane part, and forms the said engaging part are characterized by the above-mentioned. Cutter knife.   The cutter knife according to claim 3, wherein when the operating force is applied to the operating member, the engagement between the wing portion and the convex portion is released by the curved plane portion.   The convex portions are respectively formed on the upper edges of the pair of side wall surfaces constituting the guide member, and the wing portions are arranged in a pair in the width direction and are respectively associated with the convex portions on the upper edges of the pair of side wall surfaces. The cutter knife according to any one of claims 1 to 4, wherein the cutter knife is provided so as to fit.   The operation member includes a front rib that presses a bent portion that continues to the front side of the leaf spring, and a rear pressing rib that presses a bent portion that continues to the rear side of the leaf spring, and the front rib and the rear press The cutter knife according to claim 4 or 5, wherein the rib is selectively pressed against the bent portion to bend the flat portion to release the engagement between the wing portion and the convex portion.

Images