Encapsulated fastener

Details Encapsulated fastener Encapsulated fastener

1997-07-14

1999-02-16

Wilson, Neil

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

Headed fastener element with nut, washer, securing means or cap

Headed bolt or screw with threads and complementary nut

411377, 411903, 411914, F16B 1900, F16B 3300

Patent

active

058713212

ABSTRACT:
An improved, process compatible fastener is especially useful for securing a member, such as a wafer clamp ring, to an assembly for use in a process environment. The fastener is of a simple design, such that it is readily manufactured, and such that it is not a source of contamination. In particular, an integrated fastener includes both a metal fastener and a cone shaped metal lock washer within a single fastener assembly, such that a single fastener is used for accomplish the function of a screw and a washer. All surfaces of the fastener that are exposed within the process environment are encapsulated in a process compatible material. In this way, the fastener may be secured in the process environment in a single operation without leaving any gaps or partially exposed surfaces that may introduce contaminants into the process environment, such that the integrated fastener also provides the function of a process compatible cap.

REFERENCES:
patent: 2824663 (1958-02-01), Fischer
patent: 4292007 (1981-09-01), Wagner
patent: 4692080 (1987-09-01), Hyner et al.
patent: 5056975 (1991-10-01), Ando
patent: 5122021 (1992-06-01), Medal

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