Metal deforming – With stopping upon completion of prescribed operation – Metal deforming by use of roller or roller-like tool element
Patent
1990-07-19
1991-07-30
Jones, David
Metal deforming
With stopping upon completion of prescribed operation
Metal deforming by use of roller or roller-like tool element
72 33, 723916, 29243523, B21J 1518
Patent
active
050351290
ABSTRACT:
Repetition pull-through blind riveting apparatus (10), of the type comprising a reusable and reloadable mandrel with an enlarged head which is pulled through each tubular rivet in turn to install the rivet is provided with a safety device (141) for counting the total number of times the mandrel has been pulled. The apparatus includes pneumatically-operated mandrel pulling device, and a counter (132) counts the number of times the pressure of the air powering the pulling device reaches a pressure slightly below that required to pull the mandrel head through a rivet. The counter (132) is arranged to actuate, when a safe limit number of pulls has been counted, both a shut-off valve (137) to shut-off the supply of pressure air to the mandrel pulling device, and a visual indicator (135). The visual indicator (135) may be actuated at a warning count number rather lower than the safe limit number. The counter (132) can be reset to zero only by use of a separate key (142), when a new mandrel is installed in the rivet placing apparatus.
REFERENCES:
patent: 3557597 (1971-01-01), Heslop et al.
patent: 3820603 (1974-08-01), Sheffield et al.
patent: 3892120 (1975-07-01), Sheffield et al.
patent: 4368838 (1983-01-01), Sheffield et al.
Dear Aiden R.
Denham Keith
Avdel Systems Limited
Jones David
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