Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1990-07-10
1991-10-29
Gorski, Joseph M.
Metal working
Method of mechanical manufacture
Assembling or joining
29 34B, 2924353, 29509, B23P 1904, B27C 306
Patent
active
050603620
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.
REFERENCES:
patent: 3874070 (1975-04-01), Falcioni
patent: 4192058 (1980-03-01), Falcioni
patent: 4864713 (1989-09-01), Roberts et al.
patent: 4908928 (1990-03-01), Mazurik et al.
Andrews Mark J.
Birke James L.
Gross Steven
Kellner Robert J.
Michalewski David
Dungba Vo Peter
Gemcor Engineering Corp.
Gorski Joseph M.
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