JPS5936393Y2 - circular cutter - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a circular cutter.

In the circular cutter of the present application, the central axis freely protrudes downward by an elastic body, making it easy to determine the center point, and the coaxial cross-shaped claw metal fitting prevents the central axis from moving, and allows the center of the circle to be determined. It also has a simple structure.

Currently, a circular cutter of the same type as the one in this application is commercially available,
Because the central axis that protruded downwards was short, it was difficult to find the center, and since the central axis was short and easily misaligned, the ends of the circles tended to misalign.

There are also devices in which the central shaft is made to protrude appropriately using a screw, but this is also troublesome to use.

The present application relates to a device that eliminates these drawbacks.

One embodiment will be described with reference to the figures.

1 is a circular cutter main body, which is a flat rectangle,
A long hole 2 is provided in the center of the length.

The elongated hole 2 is provided with a sliding mechanism 2A that is slightly larger than the elongated hole 2 and has a step below the mid-thickness of the main body 1.

A central shaft 3 with a sharp tip has a spring 4 wrapped around the upper part, and a spring receiver 5 is loosely fitted onto the central shaft 3.

A threaded ring 6 having a diameter larger than the elongated hole 2 provided in the main body 1 is provided on the main body 1 at the lower part of the spring receiver 5, and a threaded thread 6A is provided on the inner diameter portion of the threaded ring 6.

A modified cylindrical fitting 7 that is loosely fitted below the central axis 3 is
The upper outer periphery is provided with a screw thread 7A that engages with the inner diameter thread 6A of the screw ring 6, and can slide in the main body elongated hole 2 and the slightly larger sliding groove 2A at its lower part via the short cylindrical portion 7B. A slightly smaller cylindrical part 7C and a slightly larger cylindrical part 7D are formed with steps as shown in FIG. A claw metal fitting 8 is rotatably attached by a stop metal fitting 9.

10 is a head metal fitting of the center shaft. One end of the main body 1 has a blade mounting part 11 with a thick center part, and a blade fitting groove 11A is provided on the end surface, and a screw groove 12 extends from the fitting groove toward the center of the main body. establish.

A separate blade 13 is also provided with a circle (L12) corresponding to the screw hole 12, and the blade 13 is detachably fixed to the main body 1 with a bolt 14.

15 is located on the main body (closer to the opening).

Since the present application has the above-described structure, by loosening the screw ring 6, moving the center shaft 3 appropriately within the elongated hole 2, determining the diameter with the opening 15, and tightening the screw ring 6, the thread 6A will be aligned with the metal fitting 7. The center shaft 3 is fixed to the main body 1 by engaging with the screw thread 7A provided in the main body 1.

Next, the head metal fitting 10 is pressed to make the tip of the center shaft 3 protrude, and the center point of the object to be cut v0 (not shown) is found and inserted.

When the main body 1 is lowered from now on, the tips of the cross-shaped claw metal fittings 8 will stick into the object to be cut, and the central shaft 3 will be further supported and fixed at four points.

Next, while supporting and fixing the screw ring 6 with one hand, rotate the bolt 14 or the blade attachment part with the other hand, the blade 13 will cut the workpiece in a circular shape. be.

According to the circular cutter of the present application, first, only the central shaft is
Since the main body 1 is not in close contact with the workpiece, the center point can be determined very easily.

There is no inconvenience like having to attach your face to the object to be cut as in the past.

Even if the center point is not clear, if a line indicating the diameter is shown, the center point can be found by rotating the cross-shaped claw metal fittings 8 provided coaxially with the center axis 3 and aligning them on the respective diameter lines. It is determined by oneself.

In addition, since the center shaft 3 is also supported by the tip of the cross-shaped claw metal fitting 8, the center shaft 3 will not move during the work even if the object to be cut is thick or hard, so that the circular shape will not shift at the end. There is no such thing.

Although the blade 13 is detachably fixed, the length of the blade can be freely adjusted by providing a long hole in the blade, or a support plate can be attached to the outer end of the blade attachment part, and the support plate and Various methods can be considered for attaching the blade, such as supporting the blade between the outer ends.

[Brief explanation of the drawing]

FIG. 1 is a front view of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a central sectional view. In addition, in the figure, 1 is a cutter body, 2 is a long hole, 2A is a sliding groove,
3 is a central shaft, 4 is a spring, 6 is a screw ring, 7 is a metal fitting, 8 is a cross-shaped claw metal fitting, 9 is a stopper, 11 is a blade attachment part, and 13 is a blade.

Claims (1)

[Scope of utility model registration request] A long hole is provided in the center of the flat rectangular cutter body, and within the long hole, the cutter has a central axis that is perpendicular to the top and bottom and moves in the long direction within the long hole. In a circular cutter with a freely adjustable blade attachment part, a spring is attached above the center shaft, and the threaded ring that loosely fits on the center shaft on the main body has its inner circumferential threads lower than inside the elongated hole. The device is characterized in that it engages with the screw thread above the metal fitting that is loosely fitted to the central shaft, and that a cross-shaped claw metal fitting that is loosely fitted to the lower end of the central shaft is rotatably attached to the lower end of the metal fitting with a stopper. circular cutter.