Device for drilling a conical zone in a hole

Details Device for drilling a conical zone in a hole Device for drilling a conical zone in a hole

B - Operations, Transporting

23

B

B23B 41/06 (2006.01) B23B 51/00 (2006.01) E21B 7/28 (2006.01)

Patent

CA 2375240

The present invention relates to a device for drilling a conical area in the innermost part of a previous drilled cylindrical hole. The invention provides a safe and durable fastening for screws and bolts. The device is suitable for drilling in concrete, rocks and other solid materials.

La présente invention concerne un dispositif pour percer une zone conique dans la partie la plus à l'intérieur d'un orifice cylindrique préalablement percé. L'objet de l'invention permet un ancrage sûr et durable des boulons et des goujons. Le dispositif convient pour percer le béton, la roche ou d'autres matières solides.

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