Implements or apparatus for applying pushing or pulling force – Multiple lifters
Patent
1978-11-13
1980-06-03
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Multiple lifters
254105, B66F 714
Patent
active
042058260
ABSTRACT:
A method and apparatus for lifting a tower crane, and for supporting the tower crane when lifted, utilizes the existing structure of the tower's mast sections for connection of lifting and supporting apparatus. Hydraulic jacks lift threaded lifting rods, which extend down to a pair of lifting yokes by means of adjustable nuts positioned to engage lifting surfaces of the jacks from above. At the top of the stroke of the jack, a second set of nuts are spun down the threaded rods to a position engaging a stationary support surface from above, so that the jacks can then be lowered and the first set of nuts can be spun down and returned to their original position. A third set of nuts is positioned near the bottoms of the rods to provide a means for supporting the lifting yokes. At the bottom end of the tower, at the lowermost mast section, where there are no bolts in the mast connecting sleeves, threaded rods with adjustable nuts enable the attainment of the precise desired height for the tower crane without the use of any specially fitted mast sections or attachments. Such control of the tower's height is necessary to locate a strong area of the tower, i.e. a location where struts meet the corner verticals, at a floor level so that side loading on the tower crane can be adequately accommodated.
REFERENCES:
patent: 2686420 (1954-08-01), Yontz
patent: 3053015 (1962-09-01), Graham
patent: 3207475 (1965-09-01), Johansson et al.
Kohler Manfred R.
ten Broeke Klaas E.
American Pecco Corporation
Watson Robert C.
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