JPS5943007Y2 - Replaceable cutter knife - Google Patents

Description

[Detailed description of the invention] This invention relates to a replaceable blade type cutter knife that always provides a new cutting edge by breaking off the cutting edge when the cutting edge becomes dull.
A sliding body that slides in and out of the blade is provided with a bifurcated elastic piece that engages with a serration formed in a cutout on the top surface of the sheath-like case of the knife. A slide stopper formed with a protrusion that freely slides in the gap created by bifurcating is engaged with the sliding body,
The elasticity of the elastic body that engages with the serrations of the case is controlled depending on the position of the protruding part of the slide stopper that slides in the gap between the elastic bodies, and the sliding body is either immovably fixed to the case or slid freely. This invention relates to a replaceable blade type cutter knife that is configured to be movable.

A blade body with parallel creases engraved at regular intervals toward the cutting edge is slidably inserted into a sheath-like case, and when the cutting edge becomes dull, the cutting edge is broken off and a new cutting edge is always advanced. Conventional cutter knives with replaceable blades have been used for cutting, but conventional knives of this type are not suitable for cutting thick or hard materials such as cardboard, thick cloth, plywood, or synthetic resin boards. When cutting, the blade may dig into the object to be cut and the blade may come out of the case, or if the blade is pressed strongly against the object to be cut, the blade may sink into the case. there were.

These problems occur because the blade extended from the case cannot be completely fixed in that position, and is the biggest drawback common to this type of knife.

In order to eliminate the above-mentioned drawbacks, the replaceable blade type cutter knife of the present invention is constructed so that the blade body can be completely fixed to the case.An embodiment thereof will now be described with reference to the drawings.

Reference numeral 1 denotes a sheath-like case made of a flat cylindrical body, and a groove-shaped notch 2 is provided at the center in the longitudinal direction of the side surface, and the side edges of the notch 2 have serrations with opposing protrusions and recesses. Part 3 is formed.

Reference numeral 4 denotes an auxiliary member that is fitted and fixed within the case 1, with one tip 5 slightly protruding from the case 1.

Reference numeral 6 denotes a blade body having a longitudinal shape and having parallel broken lines 8 carved at regular intervals toward the cutting edge 7, and the interval P between the broken lines 8 is between the concave portion and the concave portion or convex portion of the sawtooth portion 3 formed on the case 1. The distance is the same as the distance P between the part and the convex part.

9 is a fitting hole drilled at one end of the blade body.

Reference numeral 10 denotes a sliding body, which includes a base 12 having a protrusion 11 on the bottom surface that fits into the fitting hole 9 of the blade 6, a pressing part 13 that is pressed with a finger during sliding, and a second part on the pressing part 13. A fork-branched elastic piece 14 is provided, and the tip of the elastic piece 14 has a
A chevron-shaped protrusion 15 is provided so that the material such as plastic forming the elastic piece 14 is spread over one surface, and the protrusion 15 is adapted to engage with the sawtooth part 3 of the case 1.

Reference numeral 16 denotes a slide stopper having a U-shaped support arm 19 with a protrusion 18 that slides in a gap 17 created by bifurcating the elastic piece 14, and both ends of the support arm 19 of the stopper 16 The protrusion 1 of the elastic piece 14 is
Similarly to 5, opposing chevron-shaped protrusions 20 are formed, and the protrusions 20 are slidably engaged with guide grooves 22 provided in the side wall 21 of the pressing part 13 of the sliding body 10, and the protrusions 18 are elastic. Piece 14
It is located in the gap 17.

The sliding body 10 and the blade 6 are integrally engaged with the slide stopper 16, and the fitting hole 9 of the blade 6 and the protrusion 11 of the sliding body 10 are fitted, and the sliding body 10 and the blade 6 are fitted and fixed in the case. It is inserted into the auxiliary member 4.

Next, the operation of the replaceable blade type cutter knife of the present invention will be explained.

In order for the blade body 6 to advance from or retract into the case 1 and the auxiliary member 4, the sliding body 10 is pressed with a finger. In this case, the slide stopper 16 is moved as shown in FIGS. This is done by moving the sliding body 10 in a direction that brings it into close contact with the pressing portion 13 as shown by the solid line.

In this state, the protruding part 18 of the slide stopper 16 is located on the pressing part 13 side of the gap 17 of the elastic piece 14, so the elastic piece 14 can exhibit elasticity in the gap at its open end. As shown by the dashed line in FIG. 2, the protrusion 15 can freely move over the unevenness of the sawtooth section 3, the sliding body 10 can freely slide, and the blade 6 can also freely slide according to the sliding of the sliding body 10. It becomes possible to move.

In this case, if the elastic piece 14 of the sliding body 10 slides on the sawtooth part 3 of the case 1 by 1 pitch P, the blade 6 will move by 1 pitch P' of the broken line 8.
Since the blade 6 slides by that amount, when cutting out a blade that has become dull, the blade body 6 can be advanced by that amount.

In addition, when the blade body 6 is fixed to the case 1 by pressing the button at a certain position, the slide stopper 1 engaged with the sliding body 10
6 toward the open end side of the elastic piece 14.

The two-dot chain line in FIG. 3 shows this state.

When the slide stopper 16 is slid to the right in FIG. 3 in this way, the protrusion 18 provided on the slide stopper 16
is located in the gap 17 on the open end side of the elastic piece 14;
4 cannot exhibit its elasticity.

Recess 9, elastic piece 1 located in the recess of sawtooth part 3 of case 1
The protrusion 15 of No. 4 corresponds to the sawtooth portion 3 as shown by the two-dot chain line in FIG.
It cannot go over the convex part and is completely fixed in that position.

In order to slide the blade body 6 again, the slide stopper 16 may be slid to the left in FIGS. 1 and 3 as described above.

As described above, in the replaceable blade type cutter knife of the present invention, the sliding body 10 that extends the blade body 6 to the outside of the case 1 or retracts inside the case 1 is provided with an elastic piece 14 branched into two. A slide stopper 16 provided with a protrusion 18 that slides through a gap 17 created by bifurcating the slide body 1
0, the notch 2 provided in the case 1
To prevent an elastic piece 14 that engages with a sawtooth part 3 formed on a side edge of the elastic piece 14 from being bent into a gap 17, and to fix the elastic piece 14 in a state in which a bifurcated protrusion 15 is engaged with the sawtooth part 3. Because the elastic piece is bifurcated, the force applied to each elastic piece is divided into two, and the force applied to each elastic piece is divided into two, compared to the conventional one in which one elastic piece is engaged with the sawtooth part. In addition to being able to withstand stronger forces, the meshing area is also larger, allowing the blade to be supported stably and strongly.Furthermore, since the bifurcated elastic pieces mesh with the serrations, the meshing area is larger. There is no relief at all in the mating part, and the protrusion of the elastic piece is not made of a plate shaped like a chevron as in conventional products, but is made of a solid material such as plastic, so it is strong and does not deform. The blade body 6 can be securely fixed at a desired position when going in and out, or it can be slid freely, and the blade body can bite into the object to be cut and be pulled out during the cutting operation. The blade will not sink into the case even when strongly pressed against the object to be cut, allowing reliable work, and the blade is stable, so it can be used with confidence without any danger. It has the following effects.

In addition, in the above explanation, the blade body has parallel fold lines engraved to enable cutting, but even if there are no fold lines, the same effect can be achieved as long as it is a long and thin plate-shaped blade body. .

[Brief explanation of the drawing]

The drawings show an embodiment of the replaceable blade type cutter knife of the present invention, in which Fig. 1 is a front view, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a front view of the sliding body. FIG. 4 is a perspective view of the sliding body, and FIG. 5 is a perspective view of the slide stopper. Code 1...Case, 3...Sawtooth section, 6
...Blade body 8...Fold line, 10...
・Sliding body, 14...Elastic piece, 16...
Slide stopper.

Claims (1)

[Scope of utility model registration request] A sheath-like case of a flat cylindrical body is provided with a groove-like notch 2 on its side surface and a sawtooth part 3 is formed on the side edge of the notch 2 so as to be opposed to each other. In the replaceable blade type cutter knife in which a sliding body 10 that is integrally connected to the blade body 6 by fitting with one end of the blade body 6 is slidably inserted, the blade body 6
a base 12 having a protrusion 11 on its lower surface that fits with the base 1;
a suppressing part 13 provided on the upper surface of 2 and against which a finger is pressed; and an elastic piece 14 branched into two and connected at one end to the pressing part 13.
The sliding body 10 is formed, and a chevron-shaped protrusion 15 is provided at the open end of the elastic piece 14 so that the material such as plastic that forms the elastic piece 14 is spread over the entire surface. A slide stopper is provided on the pressing portion 13 of the sliding body 10 so as to be engaged with the sawtooth portion 3 of the sheath-like case 1, and to freely slide in the same direction as the sliding direction of the sliding body 10. 16, and further, a protrusion 18 is formed on the lower surface of the tip of the slide stopper 16, and this protrusion 18 is slidably inserted into the gap 17 created by bifurcating the elastic piece 14. A replaceable blade type cutter knife.