SCREW

A screw includes a shank with a threaded section extending downwards from a head. A drilling portion is connected to the shank. The drilling portion includes a first body having a point and a conical second body between the first body and the shank. The first body has two opposite and flat first sur...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	HUANG KUN-MU, CHENG MINGIA
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS ORMACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS,CLIPS, WEDGES, JOINTS OR JOINTING ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LIGHTING MECHANICAL ENGINEERING THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	A screw includes a shank with a threaded section extending downwards from a head. A drilling portion is connected to the shank. The drilling portion includes a first body having a point and a conical second body between the first body and the shank. The first body has two opposite and flat first surfaces. Each first surface is connected to a second surface and a third surface. The third surface slopes down from the second surface to the point. Each first surface forms a groove meeting the second surface and the third surface along a cutting edge. A distance between the two first surfaces is ¼˜¾ times a shank diameter. Thus, the effect of accommodating and removing chips and the strength of the first body are promoted. The chips leaving each groove are moved along the second body and then removed to attain a smooth and labor-saving operation.