Polymeric insert with crush-formed threads for mating with threa

Details Polymeric insert with crush-formed threads for mating with threa Polymeric insert with crush-formed threads for mating with threa

1997-04-28

1998-09-29

Saether, Flemming

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

Internally threaded fastener element, e.g., nut, etc.

Thread structure

411302, 411393, 403362, F16B 3716, B25G 302

Patent

active

058138099

ABSTRACT:
A threaded connection between adjoining male/female surfaces is produced by mating a plastic insert embedded in one surface with threads machined on the other surface. The plastic insert is pressed against the machined threads and deformed to provide conforming meshing threads in the insert, thereby producing a threaded engagement between the two surfaces. Preferably, the insert is sufficiently wide to overlap multiple machined threads and yield a stable, strip-resistant engagement. By providing at least three such inserts evenly distributed around the preexisting threads, an axially stable, screwable threaded connection is produced between the two surfaces that does not require precise machining or special tooling for unconventional threads. Although the inserts are preferably used in the female surface for ease of access, they can be used advantageously in equivalent fashion in the male surface of the screwable threaded connection.

REFERENCES:
patent: 3743333 (1973-07-01), Kosinski
patent: 4094330 (1978-06-01), Jong
patent: 4436468 (1984-03-01), Ozaki
patent: 4645395 (1987-02-01), Lundgren

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