JPS643603Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an attachment device for a rotary cutting blade to be attached to a cylindrical chuck of a drilling machine.

It is known that cutting blades with various blade shapes are removably attached to a cylindrical chuck that rotates in conjunction with the rotating shaft of a drilling machine. With such a large-diameter rotary cutter, the rotating torque is large, so it is an absolute requirement to stabilize the rotation of the cutter, and for this purpose, a strong attachment using the chuck is required.

In order to fix the rotary cutting tool 10 shown in FIG. 3 to the lower end of the cylindrical chuck 30 of the drilling machine shown in FIG. chamfered part 14
is provided, and the tightening screw 7 is screwed into a screw hole provided from the outside of the chuck 30 toward the plane of the chamfered portion 14,
The shank portion 13 is fixed by pressing the tip of the screw 7 against the chamfered portion 14.

However, with the cylindrical chuck 30 shown in FIG. 10, it is not possible to check from the outside whether the chamfered portion 14 and the tightening screw 7 are properly crimped, and the chuck 30 is fixed in the state shown in FIG. 8, for example. There were times when Such an abnormal fixed state is caused by the cylindrical chuck 30.
In some cases, it can be detected by rotating the inner shank part 13 left and right and checking whether there is any play, but if the above confirmation is not carried out, the hole may be drilled in the abnormally fixed state shown in Fig. 8. When the work is carried out, the shank portion 13 may come off from the cylindrical chuck 30, the cutting edge 11 may be damaged due to uneven load, or
If drilling is performed without knowing that the rotary blade 10 is tilted, not only will the drilling be inaccurate, but the rotary cutting blade 10 may not be able to be removed from the cylindrical chuck 30 after completion.

In view of these conventional drawbacks, the present invention has been developed so that the orientation of the plane of the chamfer provided on the shank of a rotary cutting blade fixed to a cylindrical chuck can be easily confirmed from the outside of the chuck through a confirmation window. The structure is such that an insertion hole for attaching the shank part of the rotary cutting blade is opened at the bottom of a cylindrical chuck connected to the rotating shaft of the drilling machine, and the bottom side of the cylindrical chuck is is formed with a confirmation window penetrating toward the lower end opening of the insertion hole, and the left and right sides of the confirmation window are flush with the plane of the chamfer formed on the shank of the cutting rotary blade. Alternatively, it is characterized by providing a flat portion that can form parallel surfaces.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

1 is a cylindrical chuck whose upper part is connected to a rotating shaft (not shown) of a drilling machine, and an insertion hole 2 provided at the center of the shaft.
A screw hole 3 is formed in the lower wall surface of the screw hole 3 so as to extend toward the center. Reference numeral 7 denotes a hexagonal socket tightening screw that is screwed into the screw hole 3, and the shank portion 13 of the rotary cutting blade 10 inserted into the insertion hole 2 is fixed by the tightening screw 7.

A confirmation window 5 is formed on the lower side of the cylindrical chuck 1 and extends through the insertion hole 2 toward the lower end opening thereof. A flat portion 4 having a function of a ruler for determining whether or not the shape is formed is formed respectively.

The length of the confirmation window 5 is formed to be equal to the length of the chamfered part 14 for tightening screw contact provided on the shank part 13 of the cutting rotary blade 10, and the chamfered part 14 and the flat part 4 are the same. If the shank part 13 is formed to be flat, the curved surface 13a of the shank part 13 cannot be seen through the confirmation window 5, so that it can be easily determined whether the shank part 13 has been correctly attached.

However, the chamfered portion 14 and the confirmation window 5 do not necessarily have to be formed to have the same length, and confirmation can also be made by making the chamfered portion 14 and the flat portion 4 form parallel surfaces.

Next, the operation of this embodiment will be explained.

To attach the rotary cutting blade 10 to the lower part of the cylindrical chuck 1, loosen the tightening screw 7 screwed into the screw hole 3 of the chuck 1, and then insert the shank part 13 of the rotary cutting blade into the chuck 1. Insert it into the hole 2, then check the plane orientation of the chamfered part 14 provided on the shank part 13 through the confirmation window 5, and adjust so that each plane part 4 and the chamfered part 14 are on the same plane or parallel planes. Then, the tip of the tightening screw 7 is brought into contact with the chamfered portion 14 and tightened.

In this case, if the planes of the confirmation window 5 and the chamfered part 14 are not the same plane or parallel planes (FIG. 8), while looking through the confirmation window 5, move the shank part 13 to either the left or the right. The rotary cutting blade 10 is integrally fixed to the lower part of the cylindrical chuck 1 by rotating the chamfer 14 so that the flat surface of the chamfer 14 is in the correct direction and tightening the tightening screw 7 (see FIG. 6).

Note that the confirmation window 5 is a chamfered portion 14 provided on the shank portion.
This is to confirm the position of the plane of the chuck, and it is necessary that it be close to the tightening screw 7, but it is not necessary to provide it at the lower end of the cylindrical chuck 1 as in this embodiment, and it is shown in FIG. As shown, a slit-shaped confirmation window 5a may be formed closer to the screw hole 3 and slightly above the lower end of the cylindrical chuck 1a.

The present invention has the following effects.

Using the confirmation window provided in the cylindrical chuck, you can confirm the direction of the plane of the chamfered part provided on the shank part of the cutting rotary blade, and check how the shank part enters the chuck part. By checking the orientation of the plane of the chamfer using each flat section provided as a ruler, the tightening screw can be accurately aligned with the chamfer and tightened, so the shank section can be accurately fixed to the chuck. The rotary cutting tool is no longer installed at an angle with respect to the rotation axis, and as a result, the rotating tool will not be damaged during drilling operations, and the shank will not become detached from the cylindrical chuck, making it safe and accurate. It is possible to carry out drilling work.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. FIG. 1 is a front view showing the lower part of the cylindrical chuck, FIG. 2 is a right side view of the same, FIG. 3 is a front view of the cutting rotary blade, FIG. 4 is a sectional view taken along line A-A in FIG. 3, FIG. 5 is a front view of the cutting rotary blade accurately attached to the cylindrical chuck, FIG. 6 is a sectional view taken along line B-B in FIG. 5, and FIG.
FIG. 8 is a cross-sectional view taken along line C--C of FIG. 7; FIG. 9 is a front view showing a part of a drilling machine and a cutting rotary blade mounted on a cylindrical chuck; FIG.
The figure is a front view of a conventional cylindrical chuck seen from the same direction as in FIG. 1, and FIG. 11 is a front view of another embodiment in which a rotary blade is accurately attached to the cylindrical chuck. 1, 1a... cylindrical chuck, 3... screw hole,
4, 4a: Plane portion; 5, 5a: Check window; 7:
...clamping screw, 10...cutting rotary blade, 13...shank portion, 14...chamfered portion.

Claims (1)

[Scope of utility model registration request] At the bottom of the cylindrical chuck connected to the rotating shaft of the drilling machine, there is an insertion hole for attaching the shank part of the rotary cutting blade, and at the bottom side of the cylindrical chuck, there is a hole facing toward the lower end opening of the insertion hole. A confirmation window is formed through the confirmation window, and on both left and right sides of the confirmation window, flat parts are provided that can be configured to be the same plane or parallel to the plane of the chamfered part formed on the shank part of the cutting rotary blade. Mounting device for cutting rotary blades.