JPH0543750Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Purpose of the invention] (Field of industrial use) The present invention relates to a safety cutter, and more specifically, the invention is concerned with a safety cutter, and more specifically, a movable cover is attached to the cutting edge of the cutter so that the cutting edge is always kept in place except when cutting. Concerning cutters that can be covered up.

(Prior technology) Conventionally, cutters have been widely used in which a replaceable cutter blade can be slid in and out of a sheath-shaped handle and then tightened and fixed using an operating knob, but with this, the blade remains exposed during operation. Because it is,
Sharp cutting edges can be dangerous. At the inventor's workplace, this cutter is used to cut paper tubes, but when tearing the abdomen of the paper tube from the tip to the hand, there is too much force and the cutter pulls too hard, causing cuts to the thigh. injuries are occurring frequently.

(Problem to be solved by the invention) Therefore, the present invention provides a protective cover that can automatically cover the cutting edge as soon as the cutting operation is completed, and also allows the cutting depth to be set in advance to ensure accurate cutting. This system has been improved to ensure safe and accurate work at all times without relying on the operator's attentiveness.

[Structure of the invention] The safety cutter of the present invention is a cutter consisting of a blade 1 and a sheath-shaped handle 2 that allows the blade 1 to slide in and out, and a protective case 4 that covers the exposed blade 1 at the tip of the handle 2. to establish a crown. Then, a slide groove 4a is carved in the protective case 4, and a guiding protrusion 4b connected to the handle 2 is fitted into the slide groove 4a, and a return spring 4c is inserted between one end inside the case 4 and the handle 2.
The protective case 4 is always biased in the covered state except when cutting.

(Embodiment) In FIG. 1 showing a perspective view of the cutter of the present invention, 1 is a blade of the cutter, and the blade 1 has a sheath-shaped handle 2 that accommodates the blade 1 in a manner that it can be freely moved in and out. An operating knob 3 is attached to the abdomen of the part 1 for tightening and fixing the blade at a predetermined position.

A vertical slide groove 4a is cut into the protective case 4, into which a guiding protrusion 4b connected to the handle 2 is fitted, and one end of the inside of the protective case 4 is connected to the handle 2. are connected by a return spring 4c to enable free reciprocation along the slide groove 4a. That is, as shown in FIG. 2, which depicts the side view during operation, when the handle 2 is grasped during use and the bottom of the protective case 4 is brought into contact with the workpiece, the pressing force causes the return spring 4c to come into contact with the workpiece.
The protective case 4 retreats against the urging force of the blade 1 to expose the blade 1, but once the pressing force is released after cutting,
Immediately, the protective case 4 moves forward by the biasing force of the return spring 4c and acts to cover the exposed blade 1.

Next, a fan-shaped reference piece 6 is attached to the bottom of the protective case 4, which is the contact area between the handle 4 and the workpiece, and whose angle can be adjusted by rotating in three stages: acute angle, medium angle, and obtuse angle. do. This reference piece 6 has its main part pivotally supported by a core 5a, and has a slide groove 5b and a set screw 5c on the blade side.
is attached, and the angle of the reference piece 6 can be freely adjusted in three stages: an acute angle, a medium angle, and an obtuse angle.

Then, a counting line 6 is marked on the lower end of the case 4, which indicates the depth (h) of the blade when it coincides with the back part 1a of the blade 1, and the marking method is shown in FIG. As shown, the cutting angle (θ) of the blade 1 is determined in advance in relation to the reference piece 5, and h1=L1tanθ,
Calculate h=L2tanθ and h=L3tanθ and display them.

When changing the reference piece 5 at an acute angle, a medium angle, and an obtuse angle, the amount of change is planned in advance in accordance with each change in the cutting angle (θ), and the counting scale 6 is displayed in accordance with the change. 6a, middle 6b, back 6
c is divided into three stages.

That is, when it is desired to cut into a workpiece at a medium angle with a thickness of 3 mm, for example, as shown in FIG. 4, first adjust the set screw 5c along the slide groove 5b,
Place the reference piece 5 at the middle angle position. Then, from among the counting scales 6, 6b corresponding to the middle angle is selected, and the back of the blade 1 is fixed in alignment with the counting scale. Then, when the base of the reference piece 5 is brought into contact with the workpiece and pulled while applying a pressing force to the handle 2, a depth of 3 mm is automatically set and cutting is performed.

[Effect of the invention] As described above, the present invention is provided with a protective case 4 that covers the exposed blade, and one end of the protective case 4 and the handle 2 are connected by a return spring 4c, so that cutting pressure is reduced during use. The blade is exposed only when the cutting pressure is applied, and when the cutting pressure is released after use, the blade can be immediately restored to the covered state by the biasing force of the return spring 4c, no matter how inattentive the operator is. Safety can be ensured.

In addition, when performing cutting work, the user can make a cut by aligning the back of the blade with the counting scale 6, since a counting scale 6 that indicates the depth of the blade in each step corresponds to the reference piece 5. For example, the cutting depth can be set automatically, and paper, etc. can be cut with precise precision. This is particularly effective when cutting lines with a constant thickness.

Furthermore, the cutting angle can be changed in several stages according to the material etc. using the rotatable fan-shaped reference piece 5 provided at the bottom of the protective case 4. This allows for free cutting according to the user's preference.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. Figure 1 is an overall perspective view, Figure 2 is a side view showing the operating state, and Figure 3 is a side view showing the operating state.
The figure is an enlarged side view of the main part, and Fig. 4 is a side view when cutting at a middle angle. 1...blade, 2...handle, 4...protective case, 4
a...Slide groove, 4c...Return spring, 4b...
Protrusion, 5...Reference piece, 6...Counting scale.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A cutter consisting of a blade 1 and a sheath-shaped handle 2 that allows the blade 1 to slide in and out, and a protective case 4 that covers the exposed blade 1 is provided at the tip of the handle 2. and a slide groove 4 carved into the side wall of the protective case 4.
a and a guiding protrusion 4b connected to the handle 2, and one end inside the case 4 and the handle 2 are connected by a return spring 4c, so that the protective case 4 is pressed for cutting. A safety cutter that is characterized by being always energized in a covered state. 2 At the bottom of the protective case 4 that comes into contact with the workpiece,
A fan-shaped reference piece 5 that can be freely rotated in several stages is attached,
The safety cutter according to claim 1, which is a registered utility model, characterized in that a counting scale 6 indicating the depth of the blade in each step is provided in correspondence with the reference piece 5.