DUAL-THREAD STRUCTURE AND FASTENER FOR SAME

A dual-threaded screw structure having two kinds of threads formed on a shank, namely, a first thread (S1) consisting of one thread or more threads and a second thread (S2) having a lead larger than the lead of the first thread (S1) is provided such that has a constitution, with which high effect of...

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Bibliographische Detailangaben
Hauptverfasser:	TAKEMASU, Teruie, AMANO, Shuichi, SHINBUTSU, Toshinaka
Format:	Patent
Sprache:	eng ; fre ; 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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Beschreibung
Zusammenfassung:	A dual-threaded screw structure having two kinds of threads formed on a shank, namely, a first thread (S1) consisting of one thread or more threads and a second thread (S2) having a lead larger than the lead of the first thread (S1) is provided such that has a constitution, with which high effect of prevent looseness can be attained when the screw structure is fastened with double nuts.An embodiment of the present invention exhibits an example of a dual-threaded screw structure 1A, in which a root diameter between the ridges of hill-like second thread ridges rs, rs1 - rs6 is formed to be larger by 10% of height H of ridges than an effective diameter d of a first thread (S1). In this case, also an inner diameter of an internal thread of a second nut 830 as a nut for preventing looseness is formed to be larger by 10% of height H of ridges than the effective diameter of the first thread (S1).