Blind fastener with shear washer

Details Blind fastener with shear washer Blind fastener with shear washer

1974-04-08

1976-02-10

Britts, Ramon S.

85 62, 85 77, F16B 1306, F16B 3302

Patent

active

039371239

ABSTRACT:
A blind fastener wherein a push-pull type setting tool is employed for pulling a stem into a predetermined position relative to a sleeve, and a two element shear washer is provided to fail at a predetermined shear load as created by the compressive load on the sleeve and the reaction tensile pull on the stem. Failure of the shear washer drives a locking collar between the stem and sleeve.
The shear washer comprises a pair of concentric but axially offset elements joined together by an annular shear web which, upon shear failure allows one of the elements to drive an annular locking collar between the stem and sleeve. Such shear washer together with the rivet sleeve are serially placed under compression to counteract the tensile force applied to the stem.
A further control feature consists of mating surfaces on the stem and sleeve which are caused to be engaged when the relative positions of the stem and the sleeve are proper for locking the rivet, such mating surfaces engaging at that time to cause the force on said washer to exceed the maximum shear strength of the web.

REFERENCES:
patent: 1311473 (1919-07-01), Vossler
patent: 3276308 (1966-10-01), Bergere
patent: 3277771 (1966-10-01), Reynolds
patent: 3285120 (1966-11-01), Kartiala

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