# US 2018/0320727 A1 · Screw for Thin Iron Sheets

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- Number: US 2018/0320727 A1
- Document ID: US20180320727A1
- Status: Published application
- Kind: A1
- Application number: 15/871,213
- Filed: 2018-01-15
- Published: 2018-11-08
- Earliest claimed: 2017-05-02
- Inventors: Ming-Hao Hsu
- Web page: https://patentgrep.com/patent/US20180320727A1

## CPC

- F16B 25/0068: {with multiple-threads, e.g. a double thread screws}
- F16B 25/0021: {the material being metal, e.g. sheet-metal or aluminium (F16B25/0031 takes precedence)}
- F16B 25/0047: {the ridge being characterised by its cross-section in the plane of the shaft axis}
- F16B 25/0052: {the ridge having indentations, notches or the like in order to improve the cutting behaviour}
- F16B 25/0078: {with a shaft of non-circular cross-section or other special geometric features of the shaft}
- F16B 25/0084: {characterised by geometric details of the tip}
- F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D)

## 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.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

The screw according to claim 1, wherein the screw-in portion features an included angle between 20 and 30 degrees and includes at least five thread convolutions of the first and second thread convolutions.

### Claim 3 (depends on 2)

The screw according to claim 2, wherein each of the first and second thread convolutions features a crest angle between 48 and 52 degrees.

### Claim 4 (depends on 1)

The screw according to claim 1, wherein the pitch of two adjacent second thread convolutions is equal to the pitch of two adjacent first thread convolutions, and the first and second thread convolutions have an identical thread height.

### Claim 5 (depends on 1)

The screw according to claim 1, wherein the shank further includes a head formed at a top of the shank and spaced from the screw-in portion along a longitudinal axis of the shank, with the straight rod portion being between the head and the screw-in portion, with the head provided with a socket in a top surface thereof and provided with a plurality of serrate portions at a bottom thereof.