JP2001246181A - Cutter knife - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutter knife whose blade length can be easily adjusted and blade can be easily replaced and which has no rattle at the grip part of the knife body. SOLUTION: This cutter knife is constituted of a grip part comprising an A grip 1 and a B grip 2, a thrust adjustable blade 4 for cutting, and a blade lock lever 3 to prevent the parts from rattling. The A grip 1 is equipped with a blade holding guide 5 with blade regulating projections 52, 52 at the distance equivalent to the thickness of the blade from the bottom on rising walls 51, 51 on both sides. The B grip 2 is equipped with a pressing projection 7 to press the blade 4 to a blade holding guide 5. A blade setter cam 6 presses the blade 4 to the blade holding guide 5 at a holding position and is released from the contact with the blade 4 at a releasing position. The blade 4 is inserted into the gap between the bottom face of the blade holding guide 5 and the blade regulating projections 52, 52.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter knife used for, for example, construction work, electric work, or even in general households, and in particular, serves as a guide formed on a main body portion serving as a grip portion. The present invention relates to a cutter knife used by sandwiching a thin plate-like cutting blade in a gap so as to be able to expand and contract.

[0002]

2. Description of the Related Art Conventionally, this kind of cutter knife is provided with a guide groove in which a blade moves inside a main body portion, a corrugated rack is formed in a longitudinal side edge of the guide groove, and a guide groove is formed in the guide groove. As the slider fitted and removably connected to the rear end of the blade moves with a click sensation, the blade moves with the slider by one pitch of the teeth of the rack, and a new part of the blade with excellent sharpness. Is pushed out. A cutting line is formed on the blade in accordance with the pitch of the teeth of the rack, and a portion that is worn out and has poor sharpness is cut off at the end of the guide groove and discarded.

[0003]

Therefore, in this kind of conventional cutter knife, there is a gap between the guide groove and the blade. The stored state of the blade is loose, and the direction and strength of the pressing force applied to the grip portion during use is not accurately transmitted to the blade, so that there is a problem that an expected work result cannot be obtained. Longitudinal positioning depends solely on the resiliency of the spring that is mounted on the slider and slides along the teeth of the rack. There was also a problem to be solved that was dangerous to move.

[0004] In order to solve the problems of the conventional cutter knives, the present invention aims at positioning the blade with the blade while maintaining the function of adjusting the length of the blade and the ease of replacement of the replacement blade. It eliminates backlash between the guides and ensures that the applied pressing force is accurately transmitted to the blade so that favorable working results can be obtained, and that the blade is firmly held even in the longitudinal direction. It is an object of the present invention to provide a cutter knife capable of performing the above.

[0005]

The construction of the cutter knife according to the present invention for achieving the object will be described with reference to the reference numerals used in the embodiments. The A-grip 1 divided along the thickness direction will be described. And a B grip 2, a cutting blade 4 whose base is accommodated in a space formed between them, the cutting blade 4 having an adjustable protrusion amount, and a blade lock lever 3 for preventing rattling of the blade 4. The A-grip 1 is provided on the rising walls 51, 51 on both sides thereof having a U-shaped cross section with the blade regulating projections 52, 5 facing inward from the bottom surface at an interval corresponding to the thickness of the blade 4.
2 has a blade holding guide 5 projecting therefrom, and a hinge hole 53 penetrating in the width direction at one end side in the longitudinal direction, and the B grip 2 has the thickness of the blade 4 facing the blade holding guide 5. Pressing projection 7 pressing in the direction
The blade lock lever 3 has a hinge hole 31 and a blade setter cam 6 on one end side, and a hinge hole 53 of the A-grip 1 through the hinge hole 31.
The blade setter cam 6 presses the blade 4 toward the blade holding guide 5 at the folding position and separates from the contact with the blade 4 at the release position at the folded position. The bottom surface of the blade holding guide 5 and the blade regulating protrusions 52, 5
2 and the blade 4 is inserted into the gap.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention has such a configuration. In implementing the present invention, the blade setter cam 6 is formed by a member separate from the blade lock lever 3 and a hinge shaft 8 is formed. Or the pressure contact protrusion 7 is formed in a C-shape in a side view by a plate-shaped spring member,
The embodiment may be implemented as a structure connected to the B-grip 2, or the cutting blade 4 may be provided with a plurality of pitch holes 41 at predetermined intervals in a body thereof. Can be.

In practicing the present invention, the A-grip 1 and the B-grip 2 constituting the main body, or the blade lock lever 3 are molded from a synthetic resin such as ABS resin or polycarbonate resin. It is carried out as. The blade holding guide 5 is preferably made of a metal, particularly an iron plate from the viewpoint of abrasion resistance, and is preferably integrally formed by insert molding when the A grip 1 is formed. The blade restricting projection 52 protruding inward in the vicinity of the longitudinal center of the U-shaped rising wall 51 of the blade holding guide 5 is preferably formed by extrusion molding in a pressing process because the outer peripheral side surface is desirably sharp. I do. Since the blade 4 is accommodated and positioned in the gap between the outer peripheral side surface of the blade regulating projection 52 and the U-shaped bottom surface, the size of the gap is equivalent to the thickness of the blade 4 as long as the blade 4 can slide. Should be. The bottom surface of the blade holding guide 5 may be a flat surface, but a groove having a very shallow cross section along the longitudinal direction is preferable in order to ensure the positioning function of the blade 4 by the blade setter cam 6 described later. It is convenient.

The blade 4 is made of a blade steel plate for a general cutter, and a plurality of square holes 41 for fixing the position of the blade 4 in the main body and restricting the extrusion size at one time are provided in front of the blade 4. Are formed at a predetermined pitch in a line along the longitudinal direction. Although not employed in the present embodiment, a structure may be used in which the blade 4 is moved to extrude a new portion, and then a used line is cut off to form a cutting line for discarding.

At the position behind the hinge hole 21 of the B grip 2, a pressure contact projection 7 for pressing the blade 4 against the bottom surface of the blade holding guide 5 and holding it stably is attached. In this embodiment, a U-shaped leaf spring is used as the press-contact projection 7, and a U-shaped open leg is inserted into a spring hole 22 provided on the upper wall surface of the B grip 2, and a leg tip is bent. Then, the U-shaped arc-shaped portion is cut into a pitch hole 41 of the blade 4, a through hole 41 which is a square hole in the embodiment, so that the blade 4 is pressed and positioned at the same time. It is needless to say that the press-contact projection 7 does not need to be limited to the U-shape as described above, and may have any structure as long as it has a function of pressing the blade 4 and performing positioning. Also, since the press contact projection 7 is bent at a portion between the square hole 41 and the next square hole 41 when the blade 4 moves, it is not fixed to the B grip 2, It is desirable to easily attach it so that it does not fall off and move. It is not necessary to connect a separate member to the B-grip 2, and the press-contact protrusion can be implemented by partially projecting a part of the B-grip 2 itself. It is suitable for the flat blade 4 on which no is formed.

The A-grip 1 and the B-grip 2 are united and integrally connected by a connecting screw 9 to form a main body. The hinge hole 53 of the blade holding guide 5 fixed to the A grip 1 and the hinge hole 21 of the B grip 2 are concentric with each other. In this embodiment, a projection 11 and a passage 12 are formed on the inner surface of the end of the A-grip 1, and a protrusion 23 is formed on the inner surface of the end of the B-grip 2 and a passage 24 is formed around the same. The passage 12 and the passage 24 are united to form a curved hole into which a string or the like for hanging is inserted when the two are combined to form a main body.

The blade lock lever 3 is rotatably attached to a hinge hole 53 and a hinge hole 21 of the main body by a hinge shaft 8 common to a hinge hole 31 formed at a root end. A blade setter cam 6 is mounted on the back surface of the blade lock lever 3 at a hinge hole 31 by using a hinge shaft 8. Since the blade setter cam 6 is required to have durability, in this embodiment, the blade setter cam 6 is made of metal and surface hardened. The first non-cylindrical surface portion 61, which is cylindrical in shape and abuts against the back surface of the blade lock lever 3 to prevent idling, and the corner of the blade 4 when the blade lock lever 3 is folded in front of the B grip 2. A convex portion 62 hooked on the hole 41; and a second non-cylindrical surface portion 6 through which the blade 4 passes when the blade lock lever 3 is pulled up by rotating the blade lock lever 3 from the surface by a predetermined angle.
3 are formed. In order to clearly set the position of the blade lock lever 3 when the blade lock lever 3 is folded and pulled out, and to prevent arbitrary operation of the blade lock lever 3,
Alternatively, the blade setter cam 6 or the B grip 2 may be formed with a convex portion or a concave portion for performing a click operation.

The hinge hole 53 and the hinge hole 2 of the main body are provided.
1, after the blade lock lever 3 is rotatably attached by the hinge shaft 8, the blade lock lever 3 is pulled up, and a gap formed in the contact portion between the A grip 1 and the B grip 2 of the main body. Between the blade regulating protrusion 52 of the blade holding guide 5 and the bottom surface.
When the blade lock lever 3 is returned to the folded position, the blade 4 is connected to the main body with almost no play. When the sharpness of the portion outside the blade 4 is deteriorated, the blade lock lever 3 is pulled up again, the blade 4 is pulled out as necessary, and the blade lock lever 3 is folded down. Thus, the blade 4 is positioned in the longitudinal direction, and the press-contact projection 7 is recessed into another square hole 41 and acts so as to eliminate the backlash in the thickness direction of the blade 4 at the same time as the positioning.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 are a front sectional view in a longitudinal direction, a partially cutaway plan view, and a front sectional view of a main part in a longitudinal direction in a state where a blade lock lever 3 is lifted up in a first embodiment of the present invention. 4 to 6 are component diagrams showing the external structure of the A-grip 1, FIGS. 7 to 9 are component diagrams showing the external structure of the B-grip 2, and FIGS. 10 to 12 show the external structure of the blade lock lever 3. FIG. 13 is a plan view showing the structure of the blade 4.

An A-grip 1 which forms one of the divided portions of the main body of the first embodiment is a plan view of FIG. 4, a sectional front view taken along the line aa of FIG. 5, and a sectional view taken along the line bb of FIG. The grip body is formed of ABS resin, and a blade holding guide 5 made of an iron plate is fixed therein by insert molding. The blade regulating protrusion 52 of the blade holding guide 5 is formed so as to protrude so that the protruding outer periphery is sharp.

B grip 2 forming the other side of the main body
Has the shape and structure shown in the plan view of FIG. 7, the front sectional view taken along the line cc of FIG. 8, and the sectional view taken along the line dd of FIG. 9, and the grip body is molded of ABS resin. In the figure, reference numeral 21 denotes a hinge hole, and reference numeral 22 denotes a mounting hole for the press-contact projection 7. The pressing projection 7 has both U-shaped legs inserted through the mounting hole 22 from the bottom surface side of the B grip 2, and the portion protruding to the plane side is bent and held.

The blade lock lever 3 is a bottom view in FIG. 10, a front sectional view taken along line ee in FIG. 11, and a sectional view ff in FIG.
It has the shape and structure shown in the line sectional view, and is molded of polycarbonate resin. A blade setter cam 6 is mounted inside a cam holding frame 32 formed on the bottom surface of the blade lock lever 3 and also serving as a reinforcing rib. Since the blade setter cam 6 is required to have durability, in this embodiment, the blade setter cam 6 is made of steel and surface hardened.
The first non-cylindrical surface portion 61, which is substantially cylindrical in shape and abuts against the back surface of the blade lock lever 3 to prevent idling, and the blade 4 when the blade lock lever 3 is folded in front of the B grip 2. A convex portion 62 caught in the square hole 41;
A second non-cylindrical surface portion 63 is formed to allow the blade 4 to pass when the blade lock lever 3 is pulled up by rotating the blade lock lever 3 from the surface of the B grip 2 by a predetermined angle. In the present embodiment, the convex portion 62 has a cylindrical surface as it is, and the two non-cylindrical surface portions 61 and 63 have a shape obtained by simply cutting the cylindrical surface by a plane.

As shown in FIGS. 1 to 3, the A-grip 1
And the B grip 2 are united and integrally connected by a connecting screw 9 to form a main body. The hinge hole 53 of the blade holding guide 5 fixed to the A grip 1 and the hinge hole 21 of the B grip 2 are concentric with each other. The hinge hole 53 and the hinge hole 21 of this body portion
After the blade lock lever 3 is rotatably attached by the hinge shaft 8, the blade lock lever 3 is pulled up, and the blade lock lever 3 is lifted up into the gap formed in the contact portion between the A grip 1 and the B grip 2 of the main body. Insert the blade 4 and return the blade lock lever 3 to the folded position. When the blade lock lever 3 is folded down, the convex portion 62 of the blade setter cam 6 is hooked on the square hole 41 of the blade 4 to position the blade 4 at the convex portion 62, and at the same time, the blade 4 is held on its outer peripheral surface. Pressing, pressing projection 7
Together with the action of (1), rattling between the blade holding guide 5 and the blade 4 is prevented (FIG. 1). With the blade lock lever 3 raised, the blade setter cam 6
The first non-cylindrical surface portion 61 faces the passage of the blade 4 and allows the blade 4 to move, allowing the length of the blade 4 to be adjusted and a new replacement blade to be replaced (FIG. 3).

In this embodiment, although not shown, the blade lock lever 3 faces the hinge-side end 33 of the blade lock lever 3 in order to prevent free rotation in the folded state. A small ridge is provided on the inner side surface of the end of the B grip 2 to be hooked on the hinge side end 33 in the folded state, thereby restricting its arbitrary free rotation. Further, in the present embodiment, when the projections 11 on the inner surface of the end of the A-grip 1 and the passage 12 around the same and the projections 23 on the inner surface of the end of the B-grip 2 and the passage 24 around the same are combined, The passage 12 and the passage 24 are united to form a curved hole through which a string or the like for hanging is inserted. 14 to 17 show the appearance of the cutter knife of the first embodiment.

Although the embodiments which are considered to be representative of the present invention have been described above, the present invention is not necessarily limited to only the structures shown in these embodiments. It can be implemented as one without the square hole 41 shown, one having a serrated or grooved step in place of the square hole 41, one having been subjected to knurled pressing, or the like. The present invention has the above-mentioned constituent features of the present invention, achieves the object of the present invention, and can be appropriately modified and implemented within a range having the following effects.

[0020]

As is apparent from the above description, the present invention relates to a groove or passage formed in a knife body.
In a cutter knife which is used by holding a cutting blade in a stretchable manner, the blade is inserted into a passage formed by a blade regulating protrusion and a bottom surface provided on a blade holding guide, and a blade setter cam and a pressure contact protrusion are formed. Since the blade is positioned while the blade is being pressed, the blade length can be freely adjusted and the blade can be easily replaced, but there is no backlash between the grip portion of the main body and the blade. In addition, the direction and strength of the pressing force applied to the grip portion during use is accurately transmitted to the blade, so that a favorable operation result can be obtained.
In addition, even when a strong pressing force is applied during construction or the like, the blades are erroneously moved and the danger that the conventional cutter has, which is dangerous, is also eliminated, which has an effect. is there.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of a first embodiment of the present invention.

FIG. 2 is a partially cutaway plan view of the same.

FIG. 3 is a front sectional view of a main part in a longitudinal direction in a state where a blade lock lever 3 is pulled up.

FIG. 4 is a plan view showing the external structure of the A grip 1.

FIG. 5 is a sectional view taken along line aa in FIG. 4;

FIG. 6 is a sectional view taken along the line bb in FIG. 4;

FIG. 7 is a plan view showing the external structure of the B grip 2.

FIG. 8 is a sectional view taken along the line cc in FIG. 7;

FIG. 9 is a sectional view taken along line dd in FIG. 7;

FIG. 10 is a bottom view showing the external structural relationship between the blade lock lever 3 and the blade setter cam 6;

FIG. 11 is a sectional view taken along the line ee in FIG. 10;

FIG. 12 is a sectional view taken along the line ff in FIG. 10;

FIG. 13 is a plan view showing the outer shape of the blade 4;

FIG. 14 is a plan view of the cutter knife of the first embodiment.

FIG. 15 is a front view of the same.

FIG. 16 is a left side view of the same.

FIG. 17 is a right side view of the same.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 A grip 11 projection 12 passage 2 B grip 21 hinge hole 22 spring holding hole 23 projection 24 passage 25 small projection 3 blade lock lever 31 hinge hole 32 cam holding frame 4 blade 41 square hole 5 blade holding guide 51 rising wall 52 blade regulation Projection 53 Hinge hole 6 Blade setter cam 61 First non-cylindrical surface part 62 Convex part 63 Second non-cylindrical surface part 7 Press-contact projection 8 Hinge shaft 9 Coupling screw

Claims (4)

[Claims] An A-grip divided along a thickness direction.
(1) and a B grip (2), a cutting blade (4) whose base is accommodated in a space formed between the gripping portion and the protruding amount, and a rattling of the blade (4). The blade lock lever (3) to prevent
(1) The rising walls on both sides with a U-shaped cross section (51),
(51), a blade holding guide (5) having blade regulating protrusions (52), (52) projecting inward from the bottom surface at a distance corresponding to the thickness of the blade (4), and a longitudinal direction. A hinge hole (53) penetrating in the width direction at one end of the blade, wherein the B grip (2) presses the blade (4) in the thickness direction toward the blade holding guide (5). (7), the blade lock lever (3) has a hinge hole (31) and a blade setter cam (6) at one end side,
The hinge hole of the A grip (1) is inserted through the hinge hole (31).
(53) and a hinge shaft (8) are connected so as to be openable and closable, and the blade setter cam (6) presses the blade (4) toward the blade holding guide (5) in the folded position, and in the released position. A cutter knife configured to be separated from contact with the blade (4), wherein the blade (4) is inserted into a gap between a bottom surface of the blade holding guide (5) and blade regulating protrusions (52), (52). 2. The blade setter cam (6) is formed as a separate member from the blade lock lever (3), and is connected to the blade lock lever (3) via a hinge shaft (8). 2. The cutter knife according to 1. 3. The cutter knife according to claim 1, wherein the pressure contact projection is formed in a C shape in a side view by a plate-shaped spring member, and is connected to the B grip. 4. A cutter knife according to claim 1, wherein said cutting blade (4) has a plurality of pitch holes (41) spaced at a predetermined interval in a body thereof.