US 2018/0320727 A1Published application

Screw for Thin Iron Sheets

OwnerMing-Hao Hsuinventor

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Abstract

A screw for thin iron sheets includes a shank, a first thread, and a second thread. The shank includes a tapered screw-in portion, a head, and a straight rod portion between the screw-in portion and the head. The straight rod portion features non-circular cross sections. The first and second threads are spirally developed on the outer circumference of the shank and extend to the straight rod portion from a tip of the screw-in portion, respectively. The first thread includes a plurality of first thread convolutions, and the second thread includes a plurality of second thread convolutions spaced from the first thread convolutions of the first thread. Each of the first and second thread convolutions features a crest angle between 48 and 52 degrees.

Claims5

Dependent claims

A screw for thin iron sheets, comprising:

a shank including a straight rod portion and a tapered screw-in portion at a front end of the straight rod portion, with the straight rod portion having substantially triangular cross sections, with the screw-in portion having a sharp-cone cross section with a tip;
a first thread spirally developed on an outer circumference of the shank and extending to the straight rod portion from the tip of the screw-in portion, with the first thread including a plurality of first thread convolutions;
and
a second thread spirally developed on the outer circumference of the shank and extending to the straight rod portion from the tip of the screw-in portion, with the second thread including a plurality of second thread convolutions spaced from the first thread convolutions of the first thread, wherein the first and second threads are spaced apart from each other and correspondingly extend to the straight rod portion from the tip.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 15/871,213Filed 15 Jan 2018
Priority: TW 1061144432 May 2017
Published: 8 Nov 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F16B 25/0068
Characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw: with multiple-threads, e.g. a double…
F16B 25/0021
Characterised by the material of the body into which the screw is screwed: the material being metal, e.g. sheet-metal or aluminium
F16B 25/0047
Characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw: the ridge being characterised by its…
F16B 25/0052
Characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw: the ridge having indentations,…

Family

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