Blind rivet with recessed expanding head

Details Blind rivet with recessed expanding head Blind rivet with recessed expanding head

1976-06-01

1979-02-06

Parsons, Jr., Marion

F16B 1910

Patent

active

041378172

ABSTRACT:
A blind rivet comprising a sleeve with a preformed rivet head at one end, and a setting pin telescoped into the sleeve and having a pulling section projecting beyond the headed end of the sleeve and an expanding head projecting beyond the other end of the sleeve, to be pulled into the sleeve from the headed end thereof to expand the other end of the sleeve into a bulb-shaped rivet head against one side of two workpieces that are to be riveted together, the pulling section being broken off after the rivet is set, in response to engagement of the expanding head with stop means in the sleeve. The expanding head has an expanding shoulder for initiating expansion of the sleeve, and a taper beyond this shoulder which progressively increases the diameter of the head toward its free end. The setting pin is composed of material of relatively high hardness for optimum strength in the completed joint, and the larger end portion of the taper is structurally weakened by a recess extending into the free end of the head; but stopping short of the expanding shoulder and the portion of the head that extends across the shear plane of the completed joint, so that the full strength of the material is available in the shear plane and the strength in the taper is substantially reduced. The weakening recess enhances the ability of the expanding head to form an optimum blind side rivet head in workpieces of varying grip length.

REFERENCES:
patent: 3377908 (1968-04-01), Stav et al.

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