Collapsible scaffolding tower

Fire escape – ladder – or scaffold – Ladder and platform

Reexamination Certificate

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Details

C182S178100

Reexamination Certificate

active

06953106

ABSTRACT:
A collapsible scaffolding tower having four uprights arranged in two pairs, wherein each of the uprights is formed of three or more telescopically collapsible sections and rigid horizontal bars extend between the sections of the uprights in each pair to form two telescopically collapsible ladder structures, which rest directly on the ground when the tower is in use.

REFERENCES:
patent: 1141919 (1915-06-01), Auchu
patent: 3454131 (1969-07-01), Johnson et al.
patent: 3565212 (1971-02-01), Johnson
patent: 3837427 (1974-09-01), Mattinson
patent: 4830144 (1989-05-01), Werner
patent: 4858726 (1989-08-01), Preston
patent: 5099953 (1992-03-01), Stegath
patent: 5555954 (1996-09-01), Swiderski
patent: 5988317 (1999-11-01), Riding
patent: 6119810 (2000-09-01), Harder
patent: 988270 (1965-04-01), None
patent: 1 311 569 (1973-03-01), None
patent: 1 498 618 (1978-01-01), None
patent: 2 244 753 (1991-12-01), None

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