Vertical telescoping lower crane

Details Vertical telescoping lower crane Vertical telescoping lower crane

1978-09-05

1980-04-08

Kunin, Stephen G.

Traversing hoists

Overhead

Cable

212 57, 212 64, 212144, B66C 2362, B66C 2306

Patent

active

041968140

ABSTRACT:
A rotary tower crane having a tower which can be extended step-wise by adding a section between the boom supporting segment and segments of the supporting structure is provided with a host and crab mechanism for adding or removing a section adjacent to the boom without the use of another crane. The tower is provided with a movable inner tower member slidably disposed in the upper tower segment. The inner tower member has transverse members adapted to be retracted so they will pass bracing members on the tower and to expand to a point where they will support the inner member on the brace members when immediately above the brace members.

REFERENCES:
patent: 1788451 (1931-01-01), Clapp
patent: 2676388 (1954-04-01), Favie et al.
patent: 3656631 (1972-04-01), Rauch et al.
patent: 3672115 (1972-06-01), Abe et al.
patent: 3894635 (1975-07-01), Reich

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