Traversing hoists – Having vertically swinging boom – Having means to swing boom vertically
Patent
1979-02-12
1980-09-09
Faw, Jr., Price C.
Traversing hoists
Having vertically swinging boom
Having means to swing boom vertically
52118, 52121, E04H 1234
Patent
active
042210895
ABSTRACT:
A pair of safety stop blocks are welded to opposite sides of the fly section of a construction crane boom. The stop blocks have slide passages to receive the branches of a boom extension or load cable which is looped around an arcuate saddle near the base of the fly section. A pair of stop buttons are swaged to the extension cable branches between the saddle and the two stop blocks and are normally spaced somewhat from the stop blocks to allow the cable to seek an equal loading position around the saddle. The stop blocks carry cable retainer elements near the tops of the slide passages to prevent the escape of the cable therefrom. Should the extension cable fail in any region thereof under load, at least one swaged stop button will be engaged by a stop block of the boom fly section to positively arrest its retractive movement before any damage can occur.
REFERENCES:
patent: 2896750 (1959-07-01), Eitel
patent: 3396601 (1968-08-01), Wright
patent: 3411747 (1968-11-01), Lister, Jr. et al.
patent: 3693755 (1972-09-01), Terayama
patent: 3817007 (1974-06-01), Hall
patent: 3845596 (1974-11-01), Veenstra
patent: 4133411 (1979-01-01), Curb
patent: 4156331 (1979-05-01), Lester et al.
Faw Jr. Price C.
Friedman Carl D.
Walter Kidde & Company, Inc.
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