JPS5928879Y2 - Chisel cutting blade protector - Google Patents

Description

[Detailed description of the invention] This invention relates to a cutting blade protector for a chisel, and its purpose is to enable elementary school students to safely perform carving work without injuring their fingers or fingers by the cutting blade of a chisel. To provide a cutting blade protector for a chisel that can keep the maximum cutting depth constant and prevent excessively deep carving.

This invention is a creation of a technical idea that is reasonably distantly related to the above purpose.

An embodiment of the means embodying the present invention will be described below with reference to FIGS. 1 and 2. In the drawings, 1 shows the entire protective equipment integrally molded into a flat rectangular shape from a transparent synthetic resin material, and 2 1 is the protective part forming the front half of the protective equipment 1, 3 is the protective part forming the front half of the
is a mounting part that also forms the rear half of the protective equipment 1,
The rear end is formed obliquely upward.

Reference numeral 4 denotes a linear insertion hole penetrating from the center of the base end surface 3a of the mounting portion 3 toward the center of the bottom surface 2a of the protection portion 2, and is inclined at a predetermined angle θ with the bottom surface 2a of the protection portion 2. ing.

Reference numeral 5 denotes a mounting hole formed in the center of the base end surface 3a of the mounting portion 30, coaxially with the insertion hole 4, and shaped like an elliptical cylinder whose inner end becomes narrower, as shown in FIG. Insert the cutting blade H of the chisel F into the insertion hole 4 and insert the cutting edge Ha into the protection part 2.
The chisel F is made to protrude slightly obliquely downward from the bottom surface 2a, and the oval cylindrical mouthpiece Fa of the chisel F is tightly fitted into the mounting hole 5, so that the mouthpiece Fa does not naturally separate from the mounting hole 5 due to the wedge action. In addition, the base Fa is prevented from rotating within the mounting hole 5.

Reference numeral 6 denotes a recessed portion formed in the center of the upper surface of the protective device 1 to have an elongated rectangular shape in plan and a crescent shape in longitudinal section.
This allows the chips to be discharged upward.

Reference numeral 7 denotes a shallow recess formed in the bottom surfaces 2a and 3b of the protective portion 2 and the mounting portion 3, excluding the outer peripheral edges, and when the protective device 1 is brought into sliding contact with the surface S of the object to be engraved M, the bottom surface 2a,
This is to prevent the transparency from being lost due to 3b being rubbed off.

Reference numeral 8 denotes a female threaded hole communicating with the mounting hole 5 on one side of the mounting portion 3, and 9 a screw screwed into the circular threaded hole 8.
The base Fa inside the mounting hole 5 can be fastened and fixed.

Next, the functions and effects of the present invention will be explained.

Now, in order to carry out carving work by attaching the protector 1 configured as described above to the chisel F, first insert the cutting blade H of the chisel F into the insertion hole 4 from the mounting hole 5 side and insert the cutting edge H into the insertion hole 4. The protection part 2
When it protrudes slightly downward from the bottom surface 2a, screw 9
is screwed into the female screw hole 8 to fix the protector 1 to the chisel F.

In this way, the cutting edge Ha of the cutting blade H can be cut into the object M to perform engraving work.

At this time, since the amount of protrusion t of the cutting edge Ha from the bottom surface 2a is constant as shown in FIG.
The maximum depth of cut is t when it is in perfect contact with the surface S of
Therefore, the cutting depth of the object M to be engraved can be made constant.

Furthermore, if the protector 1 side is made to be inclined with respect to the surface S of the object to be engraved M, the depth of cut of the hole tip Ha can be made to an arbitrary depth of t or less.

Furthermore, if the engraving operation is performed while changing the contact position of the bottom surface 3b (arc-shaped) with the surface S of the workpiece M, the workpiece M
can be cut into a flat O-shape.

Note that during cutting, chips can move upward along the concave groove Hb of the cutting blade H and be discharged from the concave portion 6. Now, the present invention is designed to provide a protective portion 2 with a flat bottom surface 2a, and a rear portion of the protective portion 2. and a mounting portion 3 whose bottom surface 3b is formed in an oblique shape and whose rear end is located above the bottom surface 2a of the protection portion 2. A mounting hole 5 for removably fitting the protective part 2 is formed obliquely toward the bottom surface 2a of the protective part 2.
The attachment part 3 is formed with an insertion hole 4 through which the cutting blade H of the chisel F is inserted, so that one end thereof is opened in the bottom surface 2a of the protection part 2 and the other end communicates with the attachment hole 5. A recess 6 is formed on the upper surface of the portion 2 to communicate with the intermediate portion of the insertion hole 4, and the tip of the protection portion 2 is formed to extend forwardly than the tip of the cutting blade H protruding from the insertion hole 4, and Since at least the protective part 2 is formed of a transparent material, the position of the cutting edge Ha of the cutting blade H protruding from the bottom surface 2a of the protective part 2 can be clearly confirmed, and the engraving can be performed in exactly the same way as when the protective equipment 1 is not attached. able to perform work.

Also, even if the cutting blade H accidentally slips during cutting, the tip of the protective part 2 will hit before the cutting edge Ha of the cutting blade H hits the finger of the hand holding the workpiece. Not only can engraving work be carried out safely without injuring fingers due to the cutting edge Ha, but also the maximum cutting depth can be kept constant, which has the effect of preventing excessively deep engraving.

Further, although the recesses I are formed in the bottom surfaces 2a and 3b of the protector 1, by doing so, even if the protector 1 is brought into sliding contact with the surface S of the object to be engraved M, its transparency will not be lost. Since there is no liquid, it can be used in a transparent state for a long period of time.

Moreover, the present invention can also be embodied in the following embodiments.

(a) In the above embodiment, the entire protective equipment 1 is made transparent, but only the protective part 2 is made transparent.

(b) In the embodiment described above, the protection part 2 and the attachment part 3 are formed integrally, but as shown in FIG. to do.

If this is done, the angle θ between the bottom surface 2a of the protection part 2 and the cutting blade H can be adjusted in size, so that the cutting edge Ha
The cutting depth can be freely adjusted by adjusting the protrusion amount t.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the protective equipment of the present invention, Fig. 2 is a longitudinal cross-sectional view showing the state of use, and Fig. 3
The figure is a side view showing another embodiment of the present invention. Protective equipment 1, protection part 2, bottom surface 2a, mounting part 3, insertion hole 4,
Mounting hole 5, chisel F, cutting blade H1 cutting edge Ha, protrusion amount t0

Claims (3)

[Scope of utility model registration request] (1) A protective part 2 with a flat bottom surface 2a, and a mounting that extends to the rear of the protective part 2 and has a bottom surface 3b formed in an oblique shape with the rear end located above the bottom surface 2a of the protective part 2. A mounting hole 5 for removably fitting the tip of the handle of a chisel F is formed in the mounting part 3 obliquely toward the bottom surface 2a of the protection part 2. The part 2 and the mounting part 3 are formed with an insertion hole 4 into which the cutting blade H of the chisel F is inserted, with one end opening in the bottom surface 2a of the protection part 2 and the other end communicating with the mounting hole 5. A recess 6 is formed on the upper surface of the protection part 2 and communicates with the middle part of the insertion hole 4, and the tip of the protection part 2 is shaped to extend forward of the tip of the cutting blade H protruding from the insertion hole 4. A cutting blade protector for a chisel, characterized in that at least the protective portion 2 is formed of a transparent member. (2) The cutting blade protector for a chisel according to claim 1, wherein the bottom surface 2a of the protection part 2 has a recess 7. (3) The chisel according to claim 1 or 2, wherein the protection part 2 and the attachment part 3 are formed separately and are attached to each other with a shaft 16 so that the angle can be adjusted and fixed. Cutting blade protector