Importance

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Abstract

A blind bolt for securing a plurality of workpieces at a desired clamping force includes a pin having an elongated shank terminating at one end in an enlarged pin head and a generally elongated tubular sleeve adapted to receive said pin shank. The sleeve includes a first portion adapted to be located in aligned openings in the workpieces and a second portion being located on said pin shank between said pin head and said first sleeve portion. A nut is operatively connected with said pin and is adapted to be engaged by an installation tool whereby an axial force can be applied by the installation tool between said pin and the nut to clamp the workpieces together. The second sleeve portion is radially deformable at a location between said pin head and a blind side surface of the workpieces in response to the relative axial force of a magnitude less than the clamping force to form an enlarged blind head for engaging the blind side surface. A shear washer is positioned between the nut and the sleeve for transmitting the relative axial force to the second sleeve portion through said first sleeve portion and is adapted to shear after formation of the enlarged blind head to allow the blind head to engage the blind side surface such that further engagement of the nut with the pin will cause the fastener to clamp the workpieces between the nut and the blind head.

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First Claim