JPS63179013U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway sectional view showing an embodiment of the present invention. Figure 2, Figure 3, Figure 4, Figure 5, Figure 6, Figure 7, Figure 8, Figure 9, Figure 10, Figure 1
1, FIG. 12, FIG. 13, FIG. 14, FIG. 15, and FIG. 16 are schematic end views showing other embodiments of the vicinity of the drilling blade 2, respectively. 4...hole, 5...casing, 6...hollow part,
7...Pipe, 8...Bearing.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A drill part for determining the center of a hole in an object to be drilled, a cylindrical part surrounding the drill part and having a plurality of drilling blades at the tip, the drill part and the cylinder. It has a shank part that fixes the rear part of the cylindrical part and transmits rotational force from the power part to both parts, and a suction part is provided at an appropriate position of the cylindrical part to discharge the cutting waste inside the cylindrical part to the outside. A hole saw characterized by being provided with a device. 2. A cutting waste outlet leading to the outside is provided at an appropriate position inside the cylindrical part, and a casing part connected to an external suction device is provided at the outlet opening on the outside of the cylindrical part, and the casing part and the cylindrical part are connected to each other. The cylindrical body is fixed so that it can rotate relative to each other, and when the cylindrical body rotates, the casing part covers the rotation locus of the opening.
The hole saw according to claim 1, which is a utility model, and is characterized in that the suction device and the inside of the cylindrical part can be connected. 3. Claims 1 or 2 for registration of a utility model, characterized in that the contact surface between the casing part and the cylindrical part is provided with a bearing part to maintain airtightness between the two. Hole saw as described in section. 4. Claims 1 or 2 or 3 of the utility model registration claim, characterized in that the circumferential surface of the cylindrical portion at least in the vicinity of the punching blade has a distance gradually varying from the axis of rotation thereof. Hole saw as described. 5 Practical use characterized in that the circumferential surface of the cylindrical portion at least near the drilling blade has both a portion whose distance from the rotation axis gradually varies and a portion whose distance from the rotation axis is constant. A hole saw according to claim 1, 2, or 3 of the patent claims. 6 At least the distal end portion of the cylindrical portion has, in its cross section, an arcuate portion having a circumference that is approximately the same as the circumference of the target hole diameter, and a recess that is arranged between the end of the arcuate portion and retreated in the radial direction. The hole saw according to claim 1, 2, 3, 4, or 5 of the utility model registration claim, characterized in that it has a cylindrical shape constituted by two parts.