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    • 9. 发明专利
    • PRESSURE FUSING A NUT TO A SUPPORT SHEET
    • GB2082489A
    • 1982-03-10
    • GB8101063
    • 1981-01-14
    • KRUEGER GUENTHER
    • F16B37/04B21K25/00B23K20/02F16B37/06
    • A pressing machine has opposingly spaced-apart compacting surfaces movable toward each other to weld malleable metal of a metal sheet having a nut-receiving circular aperture therethrough, into a welded state with a malleable metal of circumscribing side-walls of a cylindrically-shaped undercut nut mounted in the aperture. The nut's top has a greater diameter than the aperture. A bottom one of the compacting press surfaces has a raised rim or ridge, and an upper one of the compacting press surfaces has a plurality of raised portions, arranged in a circular array to overlap edge portions of the sheet at its aperture. With the plurality of raised portions pressing downwardly, and the ridge in a circular shape around an annulus hole of the bottom press surface, the compacting surfaces in a single compacting movement in compacting the sheet carrying the inserted nut having overlapping top edges, results in an article in which the metal sheet has become welded to the nut.