JPH0137852Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a hole cutter for drilling holes of arbitrary radius in plastic, wood, etc.

For example, cutters for drilling holes of arbitrary radius in plastic plates have conventionally been used with a movable blade attached to a spindle body equipped with a fixed blade so as to be movable in the radial direction. The movement of the movable blade is accomplished by tapping with a hammer or the like, which not only makes the work complicated, but also has drawbacks such as difficulty in making fine adjustments, and the possibility of misalignment due to tapping.

This invention was proposed to eliminate all of the above-mentioned drawbacks, and a slider with a movable blade is attached to a spindle body with a fixed blade so as to be movable in the radial direction. The cutter is capable of drilling holes in a radius, and includes a sliding part for the slider formed in the diametrical direction of the spindle body, and a stopper pin protruding from approximately the center of the sliding part, so that the slider has a central notch whose movement is regulated by the stopper pin, and sets screws are screwed onto both sides of the slider in the sliding direction so that the set screws come into contact with the stopper pin from both sides. In particular, the present invention relates to a hole-drilling cutter characterized in that the position of the slider is fixed with respect to the main shaft body.

The configuration of this invention will be explained in detail with reference to the attached drawings. Fig. 1 is an overall front view showing an example of a hole cutter of this invention, Fig. 2 is a side view showing the left side portion thereof, and Fig. 3 is a side view showing an example of the punching cutter of this invention. The figure is a partially cutaway sectional view of the slider, FIG. 4 is a sectional view with the slider inserted inward, and FIG. 5 is a sectional view with the slider extended outward.

As shown in FIG. 1, the hole punching cutter of this invention has a slider 20 with a movable blade 22 attached to a main shaft body 10 with a fixed blade 12 so as to be movable in the radial direction. It is designed to allow drilling.

The main shaft body 10 has a rotating shaft part 1 attached to the chuck part (not shown) of an electric drill or the like on the upper part.
4, and the tip of the lower fixed blade 12 is configured as a center shaft portion 13 that is the center of rotation of the cutter with respect to the workpiece.

A sliding portion 15 for the slider 20 is formed in the diametrical direction of the main shaft body 10, and a stopper pin 19 is provided protruding from approximately the center of the sliding portion 15 so as to be perpendicular to the sliding portion.

As shown in FIGS. 1 and 2, the sliding portion 15 has a movable range portion of the movable blade 22 of the slider 20 consisting of a groove portion 15a with a U-shaped cross section, and the other portion thereof is configured as a hole portion 15b. .

The stopper pin 19 is composed of a roll pin or the like so that it can be attached and detached.

The portion indicated by the reference numeral 16 in FIG. 1 is a body-side reinforcing portion provided to protect the slider 20, particularly the fixed blade 22 portion.

As can be better understood from FIG. 3, the slider 20 includes a slider body 21 and a movable blade 22.
The slider main body 21 slides within the sliding portion 15 of the spindle body 10 described above, thereby moving the movable blade 22 in the radial direction to drill a hole with a desired radius. Needless to say, it is.

A central notch 23 as shown in the figure is formed in the center of the main body 21 of the slider 20, the slider 20 moves within the range of the notch 23, and the stopper pin 19 located within the notch 23 Its movement is regulated by

Furthermore, setscrews 26 and 27 are screwed onto both sides of the slider main body 21 in the sliding direction, respectively, and by bringing the setscrews 26 and 27 into contact with the stopper pin 19 from both sides, the stopper pin 19 can be moved. The slider is configured to be fixed in position with respect to the main shaft body.

As the set screws 26 and 27, hexagon socket set screws (so-called hollow screws) as shown in the figure are preferably used. The set screw 26 is shown by a chain line in FIG.
It is a hexagonal wrench for 27, and numerals 24 and 25 represent screw holes.

Furthermore, as shown in Fig. 2, the spindle body 1
A set screw 26 (or 2
It is also preferable to form display sections 29, 29 indicating the rotation angle of 7) so that the operator can see how many times the setscrews 26, 27 have been turned. In the embodiment, the pitch of the setscrew 26 is set to 1.
By setting the value to mm or 0.5 mm, it is possible to easily determine how many millimeters the movable blade 22 moves forward or backward as the set screw rotates.

The hole cutter of this invention shown and described above can drill a hole with a desired radius by freely and reliably moving the slider 20 forward and backward by a predetermined distance by sending back the setscrews 26 and 27.

FIG. 4 is a cross-sectional view of the slider 20 inserted inside the spindle body 10 in order to make a hole with a small radius D1, and FIG. FIG. 3 is a cross-sectional view with the slider 20 extended outward. In either case, the setscrews 26 and 27 are connected to the stopper pin 1.
9, the slider 20 is fixed in position to the spindle body 10, and a predetermined radial distance of the movable blade 22 is reliably created.

In this way, in the present invention, the movable blade can be moved and fixed by sending back the set screw without needing to knock it out as in the conventional method, so the work is simple and It has many advantages over this type of cutter, such as being able to make delicate adjustments and being less prone to deviations.

[Brief explanation of the drawing]

Fig. 1 is an overall front view showing an example of the hole cutter of this invention, Fig. 2 is a side view showing the left side thereof, Fig. 3 is a partially cutaway sectional view of the slider, and Fig. 4
The figure is a cross-sectional view with the slider inserted inward, and FIG. 5 is a cross-sectional view with the slider extended outward. 10...Spindle body, 12...Fixed blade, 15...
...Sliding part, 19...Stopper pin, 20...Slider, 22...Movable blade, 23...Central notch,
26, 27... Set screw.

Claims (1)

[Claims for Utility Model Registration] A cutter in which a slider 20 having a movable blade 22 is attached to a spindle body 10 having a fixed blade 12 so as to be movable in the radial direction, thereby making it possible to drill holes with a desired radius. A sliding part 15 for the slider 20 is formed in the diametrical direction of the main shaft body 10, and a stopper pin 19 is protruded from approximately the center of the sliding part, and the slider 20 is provided with a stopper pin 19. In addition, the set screws 26 and 27 are screwed in from both sides of the slider in the sliding direction so that the set screws come into contact with the stopper pin from both sides. A hole-drilling cutter characterized in that the position of the slider is fixed with respect to the main shaft body.