Retractable column and method of forming

Details Retractable column and method of forming Retractable column and method of forming

1989-04-25

1990-05-01

Murtagh, John E.

Static structures (e.g., buildings)

Striplike unit, reversibly flexible and rigid

52745, E04H 1234

Patent

active

049207105

ABSTRACT:
A retractable support column for overhead structures that comprises there sets of rectangular shaped links that have mating hooks extending laterally outward from adjacent link chains so that the hooks can engage each other when the links are placed vertical next to each other and can disengage each other when the lower link is rotated into a horizontal position with a drive mechanism for engaging gear racks on the link chains to permit the user to raise and lower retractable column.

REFERENCES:
patent: 2130993 (1938-09-01), Dublier
patent: 2661082 (1953-12-01), Ziegler
patent: 2799368 (1957-07-01), Alter
patent: 3397546 (1968-08-01), Eisert et al.
patent: 4024595 (1977-05-01), Brown
patent: 4089147 (1978-05-01), Bain
patent: 4237662 (1980-12-01), Kinzler
patent: 4386485 (1983-06-01), Kramer

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