JP2012228330A - Cutter knife - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively avoid instable holding of a cutter knife caused by a dimension error in the rear of a cutter blade, to hold the cutter blade stably at a stationary position, and to smoothly move the cutter blade when the cutter blade is made to stick out of a case.SOLUTION: The cutter knife 10 includes the cutter blade 14 which is housed within the case 12 and which is retractable at the front end; and a slider 15 which makes the cutter blade 14 movable in the longitudinal direction. The slider 15 includes a holding surface 46 for holding the rear side of the cutter blade 14, a projection 41 to be received in a hole 14A formed within the rear surface of the cutter blade 14, and an abutting part 45 corresponding to the rear end edge 14B of the cutter blade 14. When the rear side of the cutter blade is held in the holding surface 46, the abutting part 45 is displaced rearward by the rear end edge 14B of the cutter blade 14.

Description

  The present invention relates to a cutter knife, and more particularly to a cutter knife that can stably hold a cutter blade against a slider that slides the cutter blade.

  A known cutter knife is configured to include 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 a cutter blade whose rear end is held by the slider. ing. This type of cutter knife has a slider located on the side of the case, and when used by a right-handed person, it can be easily operated with a right-hand thumb, but it is convenient for a left-handed person. It will be very bad.

  Therefore, for example, as described in Patent Document 1, 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. A locking mechanism that locks and unlocks the slider, and by partially engaging the leaf spring and the operating member, the operating member is maintained at an initial position with respect to the slider body. It has a configuration.

However, in the cutter knife described in Patent Document 1, there is a so-called “play” in which the operation member in the initial position is free to move back and forth with respect to the slider body, and when the operation force is applied. It has been found that there is room for improving the reliability of the lock mechanism while improving the responsiveness and the smoothness of the operation member returning to the initial position when the operating force is released.
Therefore, even if the present applicant combines the slider body and the operation member so that they can be moved relative to each other in the front-rear direction, the operation member can always hold the initial position, and when the operation force is applied to the operation member, A cutter knife that can quickly return the initial position of the operating member to the slider body when the operating force is released while the operating force is transmitted to the slider while maintaining good performance has been proposed (Japanese Patent Application No. 2010-215357). issue).

JP 2008-229076 A

  The cutter knife of Patent Document 1 and Japanese Patent Application No. 2010-215357 has a rear end region 100A of the cutter blade 100 sandwiched between a slider body 101 and a pressing member 102 as schematically shown in FIGS. The cutter blade 100 is held.

  Here, the slider main body 101 is received in a holding surface portion 105 that holds the rear end region 100A, and a hole 106 that is provided in the holding surface portion 105 and provided in the rear surface of the cutter blade 100. The protrusion 107 is configured to include an inclined raised portion 108 that faces the inclined rear end edge 100 </ b> B of the cutter blade 100.

  As shown in FIG. 17, if the horizontal distance L1 between the center C of the protrusion 107 and the inclined ridge 108 is equal to the horizontal distance L2 between the center C and the inclined rear edge 100B, the cutter blade 100 is moved to the slider. There is no inconvenience of wobbling in the direction of rotation about the hole 106 while being held by the main body 10.

  However, the cutter blade 100 is actually different in the dimensional accuracy of the distance L2 between the hole 106 and the inclined rear edge 100B. Accordingly, such an unevenness is anticipated in advance, and the inclined raised portion 108 is formed at a position that satisfies the condition that the distance L2 can always be kept smaller than the distance L1, so that the cutter blade 100 can be mounted. The inconvenience of disappearing was prevented beforehand.

  However, such a setting causes the cutter blade 100 to wobble in the direction of the arrow A with the protrusion 107 as the center. When the cutter blade 100 is protruded from the front end of the case (not shown), the cutter blade 100 is generated on the inner surface of the case. The inconvenience that the tip corner portion of the cutter blade 100 collides with a stepped portion (for example, reference numeral K in FIG. 4) and hinders a smooth projecting operation. Such inconvenience becomes obvious when a cutter is held in a hand so that the blade edge of the cutter blade 100 is at the upper position, for example, when a cutting operation is performed toward the ceiling or the like.

[Object of invention]
The present invention has been devised by paying attention to such inconveniences, and its purpose is to effectively avoid unstable holding due to the dimensional error of the rear portion of the cutter blade and the like. An object of the present invention is to provide a cutter knife that can be kept in a stable state and can smoothly move when the cutter blade protrudes out of the case.

In order to achieve the above object, the present invention provides a case having an inner space extending in the front-rear direction, a cutter blade housed in the case and provided so as to be able to protrude and retract at the front end of the case, and the cutter blade. In a cutter knife provided with a slider that is held and movable in the front-rear direction within the case,
The slider includes a holding surface portion that holds the rear side of the cutter blade, a protrusion that is received in a hole formed in the rear surface of the cutter blade, and a contact portion that faces the rear edge of the cutter blade. Configured with
When the protrusion is positioned in the hole and the rear side of the cutter blade is held by the holding surface, the contact portion is provided to be displaced rearward by the rear edge of the cutter blade. Yes.

  In the present invention, the abutment portion may be configured to have a substantially leaf spring shape by forming a notch portion in a part of the holding surface portion.

  Further, the distance between the virtual vertical line passing through the center of the protrusion and the contact portion is shorter than the distance between the virtual vertical line passing through the center of the hole and the rear edge.

  Further, when the cutter blade is held at a predetermined position of the slider, the contact portion is provided to be elastically displaced rearward.

According to the present invention, when the cutter blade is held on the holding surface portion, the abutting portion is displaced rearward by being pushed by the rear edge of the cutter blade, so that the projection portion is positioned in the hole. In this state, it is always kept in a state of being pushed forward, so that it is always kept stationary at a fixed position. In this way, by setting the dimensions so that the rear edge of the cutter blade abuts against the abutting portion, even if there is a dimensional accuracy error in the cutter blade, it can be used without any problem.
In addition, since the abutting portion can be formed by cutting out a part of the holding surface portion, it is only necessary to slightly change the shape of the conventional type, and there is no inconvenience that complicates the configuration.

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 the slider body, (B) is the same rear view, (C) is the same plan view, and (D) is the same bottom view. 7A is a sectional view taken along line BB in FIG. 7A, FIG. 7B is a sectional view taken along line CC, FIG. 7C is a sectional view taken along line DD, and FIG. Sectional drawing. (A) is a front view of the pressing member, (B) is the same plan view, (C) is the same bottom view, (D) is the same rear view, and (E) is a sectional view taken along line FF in FIG. 9 (D). . (A) is a front view of an operation member, (B) is the back view, and (C) is the top view. (A) is a left side view of the operation member, (B) is a sectional view taken along the line GG of FIG. 10 (B), and (C) is an enlarged sectional view taken along the line HH. (A) is a top view of a leaf | plate spring, (B) is the same front view, (C) is II sectional view taken on the line of FIG. 12 (B), (D) is a rear view of a leaf | plate spring. 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. The principal part schematic exploded perspective view for demonstrating the conventional inconvenience. The principal part front view for demonstrating the conventional inconvenience.

  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 provided between the slider 15 and the case 12 and detachably provided on the case 12 side to allow the slider 15 to be locked and released. ing.

  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.

  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 a front and rear end inclined with respect to the extending direction of the blade edge to form a plate shape of a substantially parallelogram in plan view, and is the same as a known cutter blade having a circular hole 14A in the rear portion. The structure 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 portion of one side wall surface 35 of the pair of side wall surfaces 35, a notch portion 37 is formed at a constant pitch along the front-rear direction, and further, a tongue piece portion protruding upward at the front position. 38 is continuously provided. 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.

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

  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 8, the slider main body 42 is positioned along one surface of the rear end portion of the cutter blade 14 and has a holding surface portion 46 in which the protrusion 41 is integrally provided, It comprises an attachment portion 47 that is connected to the rear portion of the holding surface portion 46 and forms an attachment region for the operation member 44. An inclined raised portion 46A is formed on the inner surface side between the holding surface portion 46 and the mounting portion 47, and the cutter is formed above the inclined raised portion 46A, that is, above the virtual horizontal line passing through the center of the protrusion 41. A contact portion 45 is provided so as to contact the rear edge of the blade 14. The contact portion 45 is configured by providing a cutout portion 49 in which a part of the holding surface portion 46 is cut out in a substantially U shape, and the upper end portion of the contact portion 45 protrudes toward the front side in FIG. It is provided in the shape provided with the head 45A. The contact portion 45 is provided in a substantially leaf spring shape in which the head 45A side can be displaced in the front-rear direction.

In the slider main body 42, in FIG. 7A, the distance L1 from the virtual vertical line passing through the center of the protrusion 41 to the head 45A of the contact portion 45 is the center of the hole 14A when the cutter blade 14 is disposed. Is provided so as to be shorter than the distance L2 (see FIG. 6) from the virtual vertical line passing through to the rear edge 14B. In other words, regarding the distance L2, it is anticipated that there is a variation that is a manufacturing error, and the abutting portion 45 is provided within the range of the distance L2, thereby holding the cutter blade 14A on the holding surface portion 46. Then, the contact portion 45 is elastically displaced rearward so that a contact force from the rear toward the front can be always applied to the cutter blade 14A.
At this time, the rear upper edge 14C of the cutter blade 14 is always pressed against the lower flat surface 46B1 of the upper horizontal portion 46B, and the cutter blade 14 is stably held.
Note that an upper horizontal portion 46B, a lower horizontal portion 46C, and a rear end 46D connected to the rear end of the upper horizontal portion 46 are formed on both upper and lower sides of the holding surface portion 46, and the upper and lower horizontal portions 46B at a position rearward of the inclined raised portion 46A. A bearing portion 48 is formed on 46C to support the pressing member 43 in a swingable manner.

  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, a spring mounting portion 52 is provided so as to project upward in the front-rear direction of the center portion, and a rising portion 53 is provided at the rear end portion. On the other hand, slot holes 55 directed in the front-rear direction are provided in two places in the front-rear direction within the surface of the front portion 50. The spring mounting portion 52 has a recessed portion 56 formed in the center of the inner surface on the front side in FIG. 7A, a protrusion 58 formed in the recessed portion 56, and the recessed portion 56. A claw piece-like convex portion 59 extending in the front-rear direction is formed on the right (rear) position. A curved concave portion 51A that partially reduces the plate thickness is formed at the lower portion of the front side surface of FIG.

As shown in FIGS. 2 and 9, the pressing member 43 is elongated and connected to a main body surface 63 located across the holding surface portion 46 and the mounting portion 47 and to the right side of the main body surface 63 in FIG. 9A. A pressing operation surface 64. The left end side of the main body surface 63 in FIG. 9A is a pressing surface 63A in which a notch 63B for receiving approximately half of the protrusion 41 of the slider main body 42 is formed. As shown in (D), a pair of upper and lower projecting shafts 65 that are fitted to a bearing portion 48 provided on the slider main body 42 are provided, and on the right side thereof, a rear end inclined edge of the cutter blade 14 is provided. A corresponding raised slope 66 is formed. The pressing operation surface 64 extends in a direction inclined with respect to the surface of the main body surface 63, and has a shape with a bent end portion 64A at the front end (rear end). The bent end portion 64A abuts on the mounting portion 47 of the slider body 42, and the pressing operation surface 64 serves as a pressing margin between the bending concave portion 51A and the curved concave portion 51A provided at the mounting portion 47. A gap is formed.
The pressing member 43 is configured such that the main body surface 63 can swing around the axis of the protruding shaft 65 as a rotation center by pressing the outer surface side of the pressing operation surface 64 with a fingertip. 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. 10 and 11, the operation member 44 includes an operation plane 72 extending in the front-rear direction along the top wall 22 of the case 12, and one end side in the short width direction of the operation plane 72. A connection piece 73 that is continuous with the upper surface and is positioned so as to pass through the slit 27 of the case 12, a finger pad 74 that is provided in a substantially cantilevered manner via the connection piece 73, and the operation A hanging surface 76 is provided as a relative surface facing the mounting portion 47 of the slider main body 42 and is connected to the other end in the short width direction of the flat surface 72, and is provided at two front and rear positions in the surface of the hanging surface 76. And an insertion piece portion 77 that is inserted into the slot hole 55 of the slider main body 42 so as not to fall off. As shown in FIG. 10C, the rear end of the drooping surface 76 has a length located behind the rear end of the operation plane 72, and a rear end wall portion 78 is provided at the rear end. ing. Further, the length of the insertion piece portion 77 in the front-rear direction is smaller than the length of the slot hole 55, so that the operation member 44 can be combined with the slider body 42 so as to be relatively movable in the front-rear direction. It is possible. Here, the difference between the length of the insertion piece portion 77 and the length of the slot hole 55 is the difference between the tip of the operation member 44 when the operation member 44 is combined with the slider body 42 and the operation member 44 is maintained at the initial position. The distance between the slider body 42 and the rear end 46D connected to the upper horizontal portion 46B is substantially equal.
A slot portion 80 extending in the front-rear direction is formed at an upper position between the insertion piece portions 77 in the drooping surface 76, and the protrusion 59 of the slider body 42 can be fitted to the slot portion 80 so as to be movable in the front-rear direction. It has become. Further, a hole 81 as a receiving portion is formed at a position behind the slot portion 80, and a bent portion (described later) of the leaf spring 17 can be received in the hole 81. As shown in FIG. 11B, the holes 81 are opposed to each other in a state where the opening width on the inner surface side (upper surface side in the drawing) is large and the opening width on the outer surface side (lower surface side in the drawing) is reduced. Are provided on the inclined surfaces 81A and 81B. Further, a front projection 82A and a rear projection 82B provided at two locations in the front-rear direction are formed on the inner surface side of the front end portion of the drooping surface 76.

2 and 12, the leaf spring 17 includes a spring body 83 extending in the front-rear direction, and a front bent portion provided on the front end side (the left end side in FIG. 12A) of the spring body 83. Part 85, a bent part 86 as a position restricting part provided on the rear end side, and a bent piece part 87 provided in the central part of spring body 83. The spring body 83 is positioned in a substantially vertical plane when attached to the slider body 42. The spring body 83 is a shift region 79 that bends in the direction toward the drooping surface 76 side of the operation member 44 when the slider 15 is assembled from the position where the bent piece 87 is provided. Yes.
The front bent portion 85 includes a central bent portion 85A having a long bent length and a pair of reinforcing bent portions 85B located on both front and rear sides thereof. Further, the bent portion 86 acting as a position restricting portion is formed by being bent into a substantially L shape in plan view, and a bent edge 86A serving as a central portion of the bent portion 86 is formed on the side of the hole 81 formed in the drooping surface 76. It is formed to be located. Here, the bent portion 86 and the hole 81 constitute an initial position holding mechanism for the operation member 44.
Further, as shown in FIG. 12C, the bent piece portion 87 includes a flat surface portion 87A and a side surface portion 87B directed downward from the tip of the flat surface portion 87A, and is in the plane of the side surface portion 87B. Is formed with a square hole 87C. The bent piece portion 87 is disposed so as to go around the upper surface side of the spring mounting portion 52 in the slider main body 42, and the protrusion 58 of the slider main body 42 can be fitted into the square hole 87C.

  The cutter knife 10 according to the present embodiment has substantially the same configuration as that of the already proposed Japanese Patent Application No. 2010-215357 except for a part or region that holds the cutter blade 14A.

  Next, the procedure for holding the cutter blade in this embodiment will be described. Here, the method of assembling and using the cutter knife 10 is the same as that of the Japanese Patent Application No. 2010-215357 (prior application), and therefore the description thereof is omitted.

  When holding the cutter blade 14, as can be understood from FIGS. 13 to 15, the slider 15 is completed by combining the holding member 43, the leaf spring 17 and the operation member 44 with the slider main body 42. Thus, the pressing operation surface 64 of the pressing member 43 is pressed and the cutter blade 14 is sandwiched and held between the pressing member 43 and the slider body 42. That is, by pressing the pressing operation surface 64, the pressing surface 63A is separated from the holding surface portion 46 to form a gap, and the rear region of the cutter blade 14 is inserted into the gap. Then, the protrusion 41 is positioned in the hole 14 </ b> A of the cutter blade 14. At this time, the rear edge 14B of the cutter blade 14 abuts against the abutting portion 45 and elastically displaces the abutting portion 45 backward, whereby the cutter blade 14 is given a forward elastic force from the rear edge 14B. In this state, it is held between the slider main body 42 and the pressing member 43.

  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.

  The operation of projecting the cutter blade 14 from the front end of the case 12 and the operation of accommodating the cutter blade 14 in the case are the same as in the prior application, and will not be described.

  Therefore, according to such an embodiment, even if there is a dimensional manufacturing error on the rear side of the cutter blade 14, the contact portion 45 always abuts against the rear edge 14 </ b> B of the cutter blade 14. Since the rotational movement of the cutter blade 14 at the center is restricted, when the slider 15 is moved forward to project the cutter blade 14 from the front end of the case 12, the cutter blade 14 hits the stepped portion K in front of the case. Such an inconvenience does not occur. Therefore, for example, the cutter blade 14 can be smoothly put out even when the cutter blade 14 protrudes from the front end by turning the case 12 upside down.

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.

DESCRIPTION OF SYMBOLS 10 Cutter knife 12 Case 14 Cutter blade 14A Hole 14B Rear end edge 14A Hole 14B Rear end edge 15 Slider 41 Protrusion part 42 Slider main body 45 Contact part 46 Holding surface part 49 Notch part S Inner space

Claims (4)

A case with an inner space that extends in the front-rear direction, a cutter blade that is housed in the case and that can be projected and retracted at the front end of the case, and can be moved in the front-rear direction within the case while holding the cutter blade In a cutter knife provided with a slider provided in
The slider includes a holding surface portion that holds the rear side of the cutter blade, a protrusion that is received in a hole formed in the rear surface of the cutter blade, and a contact portion that faces the rear edge of the cutter blade. Configured with
When the protrusion is positioned in the hole and the rear side of the cutter blade is held by the holding surface portion, the contact portion is provided so as to be displaced rearward by the rear edge of the cutter blade. Cutter knife to do.   The cutter knife according to claim 1, wherein the abutting portion is provided in a substantially leaf spring shape by forming a notch portion in a part of the holding surface portion.   The distance between the virtual vertical line passing through the center of the protrusion and the contact portion is shorter than the distance between the virtual vertical line passing through the center of the hole and the rear edge of the cutter blade, The cutter knife according to claim 1 or 2.   The cutter knife according to claim 1, 2, or 3, wherein when the cutter blade is held by a slider, the contact portion is elastically displaced rearward.

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