Retractable chain lifting device

Details Retractable chain lifting device Retractable chain lifting device

1973-04-12

1976-01-06

Spar, Robert J.

214 164A, 59 781, 214750, 74245R, B65G 4700

Patent

active

039305872

ABSTRACT:
A unique retractable lifting device includes a plurality of modular overlapping links joined by connecting pins and having central stabilizer pins. The links are retractable into a vertical plane and are extendible into a self-supporting horizontal plane.

REFERENCES:
patent: 2574045 (1951-11-01), Lapham
patent: 2869379 (1959-01-01), Welser
patent: 3070248 (1962-12-01), Mitchell
patent: 3098349 (1963-07-01), Waninger
patent: 3239088 (1966-03-01), Sano
patent: 3566603 (1971-03-01), Chadwick
patent: 3709394 (1973-01-01), Strandberg et al.

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