DEVICE FOR DRILLING A CONICAL ZONE IN A HOLE

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.

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Bibliographische Detailangaben
1. Verfasser:	FAANES, PER, °GE
Format:	Patent
Sprache:	eng ; spa
Schlagworte:	BORING MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR PERFORMING OPERATIONS TRANSPORTING TURNING WORKING CEMENT, CLAY, OR STONE WORKING STONE OR STONE-LIKE MATERIALS
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Beschreibung
Zusammenfassung:	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.