Patent ID: 7313851
Filing Date: 2008-01-01
Classification: B21J,Y10T

Abstract:
1. An installation monitoring apparatus for monitoring the attachment together of stacked top and bottom members by the installation of a blind rivet having a rivet head abutting the top member and a hollow shank reaching through aligned holes of the top and bottom members and having a terminal end, and a mandrel including a stem extending through the hollow shank of the rivet and a mandrel head adjacent the terminal end of the rivet shank; comprising: a tool housing having an anvil seated on the rivet head; a collet reciprocable within the tool housing and carrying jaws for gripping the mandrel and retracting the jaws to thereby displace the jaws and the mandrel axially and cause the mandrel head to axially collapse and radially expand the hollow shank of the blind rivet into engagement with the bottom member so that the rivet attaches the top member and the bottom member; a transducer for measuring the axial load imposed on the mandrel and a linear variable differential transformer mounted on the tool housing and having a spring loaded probe that engages with an arm carried by the collet so that the spring loaded probe follows the axial displacement of the collet for measuring the axial displacement of the collet and the jaws therewith.