Rivet fastener

Abstract

Abstract A FASTENER FOR JOINING STRUCTURAL MEMBERS IS DISCLOSED WHICH MARKEDLY IMPROVE THE FATIGUE LIFE OF THE STRUCTURE MEMBERS. THE FASTENER INCLUDES A PIN HAVING A HEAD AND A SHANK ADAPTED TO BE INSERTED THROUGH ALIGNED APERTURES IN THE STRUCTURAL MEMBERS. THE SHANK INCLUDES A TAPERED PORTION, A COLLAR-RECEIVING PORTION AT THE END OPPOSITE THE HEAD AND AN INTERMEDIATE PORTION CONNECTING THE TAPERED PORTION AND THE COLLAR-RECEIVING PORTION. THE TAPERED PORTION OF THE SHANK IS ADAPTED TO SEAT, WITH AN INTERFERENCE FIT, IN TAPERED PARTS OF THE APERTURES SO THAT WHEN THE PIN IS SET IN PLACE UNDER TENSION, THE PARTS OF THE STRUCTURAL MEMBERS SURROUNDING THE TAPERED PORTION OF THE PIN ARE SUBJECTED TO COMPRESSIVE PRELOADS HIGHER THAN THE TENSILE LOADS TO BE APPLIED TO THE STRUCTURAL MEMBERS DURING UTILIZATION. THE COLLAR HAS PLANAR ENDS, FRUSTO-CONICAL END SECTIONS AND A SINUOUS EXTERIOR SURFACE BETWEEN THE END SECTIONS. THE COLLAR IS SWAGED ABOUT AND WITHIN AN ANNULAR DEPRESSION IN THE COLLAR-RECEIVING PORTION OF THE PIN BY MEANS OF A SETTING TOOL COOPERATING WITH ONE OF THE FRUSTO-CONICAL END SECTIONS THEREBY SEATING THE PIN AND SUBJECTING IT TO SUBSTANTIAL TENSILE LOAD. THE DESIRED COMPRESSIVE BEARING PRELOAD IS THEREBY PRODUCED IN THE PARTS OF THE STRUCTURAL MEMBERS SURROUNDING THE TAPERED PORTION OF THE PIN.

Inventors

• 👤 Emric Bergere

Bibliographic Details