Metal working – Method of mechanical manufacture – With testing or indicating
Patent
1996-02-06
1997-09-30
Bryant, David P.
Metal working
Method of mechanical manufacture
With testing or indicating
29509, 295241, 2952506, 411507, B23Q 1700
Patent
active
056715218
ABSTRACT:
The method of clamping together two workpiece sheets using a rivet, one sheet having a bore, and a counterbore, which is frusto-conical and tapers forwardly between a side of the one sheet and the bore, and toward the bore, and that includes providing a metallic rivet having an axially extending shank defining an axis, the rivet metal consisting essentially of fine-grained aluminum alloy; providing the rivet with a head having an end face and a forwardly tapered frusto-conical section located forwardly of the end face; installing the shank in the bore, with part of the head in the counterbore, so that the periphery of the head end face projects above the work surface, the end face formed to provide a ring-shaped dome protruding axially in an upward direction, the dome located to extend about the axis in substantially axial alignment with the outer surface of the shank, the ring dome forming a central recess; the rivet head provided with a peripheral side wall spaced radially from a side wall defined by the workpiece counterbore, the rivet shank having an end terminal; and applying force to the ring dome and to the end terminal to cause the shank proximate the end terminal to expand and engage the exposed outer surface of the lower sheet, and simultaneously to cause the ring dome to flatten, and to cause shank fine-grain, ductile, aluminum alloy metal to backflow upwardly to effect extruding of metal upwardly and centrally to the recess; the force application being continued to cause the expanding lower terminal to form a buck-tail adjacent the lower sheet outer surface exerting clamping force against that lower surface, and to produce a flattened top surface at the rivet head, with the top surface lowered toward but spaced above the upper surface level of the upper sheet, whereby the two sheets are held forcibly clamped between the head and the buck-tail.
REFERENCES:
patent: 2237338 (1941-04-01), Dale
patent: 3639137 (1972-02-01), Marinelli
patent: 3680429 (1972-08-01), Briles
patent: 3894466 (1975-07-01), Wibrow
patent: 3927458 (1975-12-01), Speakman
patent: 4000680 (1977-01-01), Briles
patent: 4051592 (1977-10-01), Briles
patent: 4086839 (1978-05-01), Briles
patent: 4159666 (1979-07-01), Briles
patent: 4348140 (1982-09-01), Bergholz et al.
patent: 4985979 (1991-01-01), Speakman
patent: 5026234 (1991-06-01), Luhm
patent: 5129771 (1992-07-01), Briles
patent: 5273386 (1993-12-01), Luhm
patent: 5332349 (1994-07-01), Gerwin
T. Uno, H. Yoshida and Y. Baba, "Development of Fine Grained 7075-0 Sheet For Aircraft Taper-Rolled Stringer", Paper presented at the International Conference, University of Virginia, 15-20 Jun. 1986, pp. 370-371, 378-379, & 389.
Bryant David P.
Haefliger William W.
LandOfFree
Rivet clamp-up deformation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Rivet clamp-up deformation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rivet clamp-up deformation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2248875