1976-09-27
1978-05-16
Britts, Ramon S.
85 77, F16B 1306
Patent
active
040892492
ABSTRACT:
In this blind rivet, the sleeve is counterbored from the rear end, and has interior axial splines forward of the counterbore. The bulb-forming lugs project laterally from a shoulder portion of the mandrel that has a diameter sufficiently great to collapse the sleeve splines during rivet installation. Between the bulb-forming lugs and the mandrel blind end are a set of annular flutes in the mandrel. During rivet installation these flutes urge radial expansion of the sleeve counterbore region to assist hole filling. The sleeve may include a lock-collar-guiding counterbore having an annular convex region providing a locking collar entry resistance surface effective during the initial phase of rivet installation.
REFERENCES:
patent: 2114493 (1938-04-01), Huck
patent: 2372222 (1945-03-01), Mullgardt
patent: 2955504 (1960-10-01), Lovrinch et al.
patent: 3390601 (1968-07-01), Summerlin
patent: 3414965 (1968-12-01), Stau et al.
patent: 3489056 (1970-01-01), Blakeley
patent: 3880042 (1975-04-01), Binns
patent: 3915055 (1975-10-01), Binns
patent: 3937123 (1976-02-01), Matuschek
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