Self tapping screw for wallboards - has larger diameter threads near head

The screw for securing wall boards has a larger diameter thread (3) at its upper part, with a section of shaft without threads under the head, covering the width of the board. The cutting tip of the screw has two cutting edges (8) while the thread has two profiles with different width. The threadles...

Ausführliche Beschreibung

Bibliographische Detailangaben

1. Verfasser:	KNOCHE,FRANK
Format:	Patent
Sprache:	eng ; ger
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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