Screw for screwing into a material of low strength

Details Screw for screwing into a material of low strength Screw for screwing into a material of low strength

2005-01-25

2005-01-25

Shackelford, Heather (Department: 3673)

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Thread or shank structure

C411S426000, C411S424000

Reexamination Certificate

active

06846142

ABSTRACT:
Screw made of plastic for screwing into a material of low strength, e.g. rigid foam plastic, having a deep thread compared with the screw shank, the screw shank running out conically into a screw point. The screw has the following features:1. the depth of thread H and the minor diameter Dk of the thread form a quotient Q1=H/Dk in the order of magnitude of 1 to 3.5, preferably 2;2. the minor diameter Dk and the thread pitch P form a quotient Q2=Dk/P in the order of magnitude of 0.3 to 0.6, preferably 0.5;3. the thread is designed as a V-thread having a vertex angle of the thread teeth of less than 30°.

REFERENCES:
patent: 1031639 (1912-07-01), Funderburg
patent: 2301181 (1942-11-01), Ilsemann
patent: 3882917 (1975-05-01), Orlomoski
patent: 4024899 (1977-05-01), Stewart
patent: 4252168 (1981-02-01), Capuano
patent: 4892429 (1990-01-01), Giannuzzi
patent: 5267423 (1993-12-01), Giannuzzi
patent: 6419436 (2002-07-01), Gaudron

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