B - Operations – Transporting – 21 – J
Patent
B - Operations, Transporting
21
J
218/8
B21J 15/34 (2006.01) B21J 15/06 (2006.01)
Patent
CA 1047000
ABSTRACT OF THE DISCLOSURE The method and means for installing blind fasteners involves a pulling head design such that will cause the stem of the rivet pin to be broken at a predetermined location by a trimming or notching action of the head. This allows a previously unweakened blind fastener pin to be weakened for breaking at a prescribed location after the fastener is in- stalled, thus accomplishing a pin break off substantially flush with the head of the fastener over an extremely wide range of thickness and types of materials being fastened. The pulling means any include a support housing which slidably receives a chuck assembly for pulling the blind rivet pin. A collect is also mounted in the support housing. The collect has suitable cutting edges for weakening the pin stem immediately adjacent the head of the rivet sleeve when appropriate load forces are reached. Cooperating cam surfaces on the support housing and collect react to the load forces to effect this weakening action. The means for controlling the load forces to effect such stem weakening may be mechanical, mechanical with spring adjustment, or mechanical/hydraulic with adjustment.
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