JP3482520B2 - cutter knife - Google Patents

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 example, for construction, electrical work, or even in general households, and in particular, it serves as a guide formed on a main body portion which is a nigiri portion. The present invention relates to a cutter knife that is used by holding a thin blade for cutting in a gap so that the blade can extend and contract.

[0002]

2. Description of the Related Art Conventionally, a cutter knife of this type has a guide groove in which a blade moves inside a main body portion, and a corrugated rack is formed at a longitudinal side edge of the guide groove. As the slider fitted and detachably connected to the rear end of the blade moves with a click sensation, the blade moves with the slider by one pitch of the rack teeth, and a new part of the blade with excellent sharpness Are pushed out to the outside. 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 and has poor sharpness is broken off at the end of the guide groove and discarded.

[0003]

Therefore, in such a conventional cutter knife of this type, since there is a gap between the guide groove and the blade, the inside of the guide groove is located with respect to the grip portion of the main body. There is rattling in the housing state of the blade, the direction and strength of the pressing force applied to the grip portion during use are not accurately transmitted to the blade, and there is a problem that the expected work result cannot be obtained. The positioning in the length direction depends only on the elasticity of the spring that is attached to the slider and slides along the teeth of the rack, so if you use it for construction work and apply a strong pressing force, the blade will accidentally It also had a problem to be solved that it was dangerous to move.

Therefore, in order to solve the problems of the conventional cutter knife, the present invention positions the blade with the blade while maintaining the function of adjusting the length of the blade and the ease of replacement of the blade. Eliminates rattling between the guides and the applied pressing force to the blades so that the desired work results can be obtained and the blades are firmly held in the longitudinal direction. The object is to provide a cutter knife that can be used.

[0005]

The structure of the cutter knife according to the present invention for achieving the object, according to an aspect of, referring to the code used in the examples, is divided in the thickness direction
And a gripping portion composed of an A grip 1 and a B grip 2, a cutting blade 4 having a base portion housed in a space formed between the gripping portion 4 and an adjustable protrusion amount, and a blade lock lever for preventing rattling of the blade 4. 3, the A-grip 1 has rising walls 5 on both sides with a U-shaped cross section.
The blade holding guides 5 having the blade regulating projections 52, 52 projecting inwardly from the bottom surface at a distance corresponding to the thickness of the blade 4 from the bottom surface, and penetrated in the width direction at one end side in the longitudinal direction. The B-grip 2 is provided with a press-contact projection 7 that presses the blade 4 toward the blade holding guide 5 in the thickness direction, and the blade lock lever 3 has a hinge hole at one end side. 31 and a blade setter cam 6 are connected via the hinge hole 31 to the hinge hole 53 of the A-grip 1 so as to be openable / closable by a hinge shaft 8 so that the blade setter cam 6 holds the blade in a folded position. The blade 4 is pressed toward the guide 5 and separated from the contact with the blade 4 in the release position, and the bottom of the blade holding guide 5 is In which the the gap between the blade restricting protrusion 52 and 52 blade 4 has a configuration which is inserted a.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention has such a structure. In carrying out the present invention, the blade setter cam 6 is formed as a member separate from the blade lock lever 3, and a hinge shaft 8 is formed. It is implemented as being connected to the blade lock lever 3 via, or the pressure contact projection 7 is formed by a plate-like spring member into a C-shape in a side view,
It may be implemented as a structure connected to the B-grip 2, or may be implemented as the cutting blade 4 having a plurality of pitch holes 41 at a predetermined interval in its body. You can

In the practice of the present invention, the A grip 1 and the B grip 2 constituting the main body, or the blade lock lever 3 are molded by synthetic resin such as ABS resin or polycarbonate resin. To implement. The blade holding guide 5 is preferably made of a metal, particularly an iron plate, from the viewpoint of wear resistance, and is preferably integrally insert-molded when the A grip 1 is molded. It is desirable that the blade regulating projection 52, which protrudes inwardly in the vicinity of the center in the longitudinal direction of the U-shaped rising wall 51 of the blade holding guide 5, has a sharp outer peripheral side surface. To do. Since the blade 4 is housed and positioned in the gap between the outer peripheral side surface of the blade regulation protrusion 52 and the U-shaped bottom face, the dimension of the gap corresponds to the thickness of the blade 4 within a range in which the blade 4 can slide. Should be. The bottom surface of the blade holding guide 5 may be a flat surface, but a concave groove along the longitudinal direction having a very shallow cross section is used to ensure the positioning function of the blade 4 by the blade setter cam 6 described later. It is convenient.

The blade 4 uses 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 portion and regulating the extruding size per time are provided on the front surface thereof. , Are formed in a row along the longitudinal direction at a predetermined pitch. Although not used in this embodiment, the blade 4 may be moved to push out a new part, and then a cutting line may be formed to break away the used part and discard it.

A pressure contact projection 7 for pressing the blade 4 toward the bottom surface of the blade holding guide 5 and stably holding the blade 4 is attached to a position rearward of the hinge hole 21 of the B grip 2. In this embodiment, a U-shaped leaf spring is used as the press-contact projection 7 when viewed from the front. The U-shaped open leg portion is inserted into the spring hole 22 provided on the upper wall surface of the B grip 2, and the leg tip portion is bent. The U-shaped arcuate portion is inserted into the pitch hole 41 of the blade 4, that is, the 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-contacting projection 7 is not limited to the U-shape as described above, and may have any structure as long as it has a function of pressing and positioning the blade 4. Further, 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 install it easily 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 pressure contact protrusion can be implemented as a part of the B grip 2 itself is partially projected. In this case, the square hole 41 is used. It is suitable for the flat blade 4 in which the groove is not formed.

The A-grip 1 and the B-grip 2 are united and integrally coupled by a coupling screw 9 to form a main body. Due to this combination, 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 in a coaxial state. In this embodiment, the protrusion 11 and the passage 12 are provided on the inner surface of the end of the A grip 1, and the protrusion 23 and the passage 24 are provided on the periphery of the inner surface of the end of the B grip 2. It is formed so that when the two are united to form a main body, 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.

The blade lock lever 3 is rotatably mounted by a hinge shaft 31 which is common to the hinge hole 53 and the hinge hole 21 of the main body, by a hinge hole 31 formed at the root end. On the back surface of the blade lock lever 3, a blade setter cam 6 is attached to the hinge hole 31 using the hinge shaft 8. Since the blade setter cam 6 is required to have durability, it is made of metal and surface-hardened in this embodiment. The shape is cylindrical, and the first non-cylindrical surface portion 61 that 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. The second non-cylindrical surface portion 6 that allows the blade 4 to pass when the convex portion 62 hooked in the hole 41 and the blade lock lever 3 are rotated by a predetermined angle from the surface and pulled up.
And 3 are formed. In order to clearly set the position of the blade lock lever 3 in the folded state and the pulled out state and prevent an 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 that causes a click operation.

The hinge hole 53 and the hinge hole 2 of the main body portion
1, the blade lock lever 3 is rotatably attached by the hinge shaft 8, and then the blade lock lever 3 is pulled up to form a gap formed in the contact portion between the A grip 1 and the B grip 2 of the main body. From the blade holding guide 5 between the blade regulating projection 52 and the bottom surface of the blade 4
Is inserted and the blade lock lever 3 is returned to the folded position, the blade 4 is connected to the main body without any 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 much as necessary, and then the blade lock lever 3 is folded in, so that the convex portion 62 is caught in the square hole 41. The blades 4 are positioned in the longitudinal direction, and the press contact projections 7 are recessed into the other square holes 41, and at the same time, they serve to eliminate the play in the thickness direction of the blades 4.

[0013]

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

The A grip 1 forming one of the divided main body portions of the first embodiment is a plan view of FIG. 4, a front sectional view taken along the line aa of FIG. 5, and a cross sectional view taken along the line bb of FIG. The grip body has a shape and structure as shown in FIG. 1, and the grip body is molded of ABS resin, and the blade holding guide 5 made of an iron plate is fixed inside by insert molding. The blade regulation projection 52 of the blade holding guide 5 is processed so as to have a sharp outer periphery.

B-grip 2 forming the other side of the body
Has the shape and structure shown in the plan view of FIG. 7, the front sectional view taken along line cc of FIG. 8 and the sectional view taken along line dd of FIG. 9, and the grip body is molded of ABS resin. In the figure, 21 is a hinge hole, and 22 is a mounting hole for the pressure contact projection 7. The U-shaped legs of the pressure contact projection 7 are inserted into the mounting holes 22 from the bottom surface side of the B grip 2, and the portions protruding toward the flat surface are bent and held.

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

As shown in FIGS. 1 to 3, the A grip 1
And the B grip 2 are united and integrally coupled by a coupling screw 9 to form a main body. Due to this combination, 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 in a coaxial state. 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 pulled up in 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. In the state where the blade lock lever 3 is folded, the convex portion 62 of the blade setter cam 6 is caught in the square hole 41 of the blade 4 to position the blade 4 at the convex portion 62, and at the same time the outer peripheral surface of the blade 4 holds the blade 4. Press, press contact projection 7
In combination with the above action, rattling between the blade holding guide 5 and the blade 4 is prevented (FIG. 1). With the blade lock lever 3 pulled up, the blade setter cam 6
The first non-cylindrical surface portion 61 faces the passage of the blade 4, allows the blade 4 to move, and enables the length adjustment of the blade 4 and the replacement of a new blade (FIG. 3).

In the present 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 the blade lock lever 3 from freely rotating in the folded state. A small ridge is provided on the inner surface of the end of the B-grip 2 and is caught by the hinge-side end 33 in a folded state to limit its arbitrary free rotational movement. Further, in the present embodiment, when the protrusions 11 on the inner surface of the end portion of the A grip 1 and the passages 12 around it and the protrusions 23 on the inner surface of the end portion of the B grip 2 and the passages 24 around them are combined, It is devised that the passage 12 and the passage 24 are united with each other 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 examples considered to be typical of the present invention have been described above, the present invention is not necessarily limited to the structures shown in these examples. The square hole 41 shown may not be provided, a saw tooth step or a groove step may be formed in place of the square hole 41, or a knurled pressure process may be performed. The present invention can be carried out with appropriate modifications within the scope of the above-mentioned constitutional requirements of the present invention, the object of the present invention, and the following effects.

[0020]

As is apparent from the above description, the present invention provides a groove or passage formed in the knife body.
In a cutter knife that is used by sandwiching a cutting blade so that it can expand and contract, the blade is inserted into a passage formed by a blade regulating projection provided on a blade holding guide and a bottom surface, and a blade setter cam and a pressure contact projection are provided. Since the blade is positioned while pressing the blade with and, the length of the blade can be adjusted freely and the blade can be easily replaced, but there is no backlash between the grip part of the main body and the blade. Since the direction and strength of the pressing force applied to the grip portion during use are accurately transmitted to the blade, there is an effect that a favorable work result can be obtained.
In addition, even when a strong pressing force is applied to use for construction work, it has an effect that the disadvantage that the conventional cutter that the blade moves by mistake is dangerous is eliminated. is there.

[Brief description of 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 cross-sectional view of essential parts in the longitudinal direction in the same state where the blade lock lever 3 is pulled up.

FIG. 4 is a plan view showing an outer structure of an A grip 1.

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

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

FIG. 7 is a plan view showing an outer structure of a B grip 2.

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

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

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

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

12 is a cross-sectional view taken along line ff in FIG.

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

FIG. 14 is a plan view of the cutter knife according to 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]

1 A grip 11 protrusions 12 passages 2 B grip 21 Hinge hole 22 Spring holding hole 23 Protrusion 24 passages 25 small protrusions 3 Blade lock lever 31 Hinge hole 32 Cam holding frame 4 blades 41 Square Hole 5 Blade holding guide 51 rising wall 52 Blade regulation protrusion 53 Hinge hole 6 blade setter cam 61 First non-cylindrical surface portion 62 convex 63 Second non-cylindrical surface portion 7 Pressure contact protrusion 8 hinge axis 9 coupling screws

Claims (4)

(57) [Claims] 1. A grip part comprising an A grip (1) and a B grip (2) divided in a thickness direction, and a base part accommodated in a space formed between the grip parts for cutting with adjustable protrusion amount. The blade (4) and a blade lock lever (3) for preventing rattling of the blade (4), and the A grip (1)
However, the rising walls (51), (51) on both sides with a U-shaped cross section
A blade holding guide (5) in which the blade regulating projections (52), (52) are protruded inward from the bottom surface at an interval corresponding to the thickness of the blade (4), and one end side in the longitudinal direction. And a hinge hole (53) penetrating in the width direction at
The grip (2) includes a pressure contact protrusion (7) that presses the blade (4) toward the blade holding guide (5) in the thickness direction, and the blade lock lever (3) has a hinge hole at one end side. (31) and a blade setter cam (6), and the hinge hole (5) of the A grip (1) is inserted through the hinge hole (31).
3) and a hinge shaft (8) are swingably connected to each other, the blade setter cam (6) presses the blade (4) toward the blade holding guide (5) in the folded position, and the blade in the released position. A cutter knife configured to be separated from the contact with (4), and in which the blade (4) is inserted into a gap between the bottom surface of the blade holding guide (5) and the 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). The cutter knife according to 1. 3. The cutter knife according to claim 1, wherein the press-contact protrusion (7) is formed in a C-shape in a side view by a plate-shaped spring member and is connected to the B-grip (2). 4. The cutter knife according to claim 1, wherein the cutting blade (4) is provided with a plurality of pitch holes (41) at a predetermined interval in a body portion thereof.