Slug riveting method and apparatus with C-frame deflection compensation
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 29, 1991
Grant Date -
N/A
app pub date -
Jul 10, 1990
filing date -
Jul 10, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for riveting two workpieces (20, 22) together by simultaneously upsetting both ends of a slug rivet (12). The present apparatus includes a frame portion (44) which may deflect during the rivet upsetting operation and a frame compensation booster assembly (164) which is provided to ensure that movement of the upper riveting ram relative to the frame portion (44) is increased an amount equal to the frame deflection so that the workpieces will be maintained in a substantially fixed work plane during the upsetting operation. Before the slug rivet is upset and after the slug rivet has been snugly engaged by the riveting rams (50, 60) the pressure behind the riveting rams is equalized by introducing fluid into the cylinder (48) until the pressure within the cylinder (48) equals the pressure within the cylinder (56). This is to prevent movement of the workpiece at the commencement of the upsetting operation.
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