Brushing – scrubbing – and general cleaning
Patent
1975-12-08
1977-01-25
Frazier, Roy D.
Brushing, scrubbing, and general cleaning
151 36, F16B 1304
Patent
active
040044866
ABSTRACT:
A fastener assembly for use in the blind fastening of first and second parts having aligned apertures extending therethrough with the aperture in the second part being larger than the aperture in the first part. A stud member with a screw threaded shank is adapted to be projected through the aligned apertures with the head being positioned on the outer side of the first part and being larger than the aperture in the first part. A threaded nut is adapted to be coupled with the shank and is smaller in diameter than the aperture in the second parts so it can be projected therethrough and to be located on the opposite side of the second part from the first part. A helical spring having a normal outer diameter larger than the aperture in the first part and smaller than the aperture in the second part is assembled around the stud in engagement with the nut. The spring is expandable to have a larger diameter. A second biasing spring is preloaded and bears against the under surface of the first part and the nut so that when the assembled shank portion of the stud and the springs and nut are inserted through the aperture in the second part a biasing force is applied to the nut substantially in an axial direction. Thereafter, upon rotation of the stud the nut is retained against rotation to permit axial movement thereof along the shank to apply a biasing force to the helical spring and expand the spring into engagement with the surface of the second part and retain the second part in fixed relation to the first part. The same biasing action will occur to permit relative rotation in loosening the fastener and permitting disassembly of the first and second part.
REFERENCES:
patent: 768283 (1904-08-01), Jenkins
patent: 1586904 (1926-06-01), Kuhn
patent: 3152375 (1964-10-01), Blakeley
patent: 3564563 (1971-02-01), Trotter et al.
Bonck Rodney H.
Dzus Fastener Co. Inc.
Frazier Roy D.
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