Fail-safe stop arrangement for crane boom extension cable

Details Fail-safe stop arrangement for crane boom extension cable Fail-safe stop arrangement for crane boom extension cable

B - Operations, Transporting

66

C

212/28

B66C 23/04 (2006.01) B66C 23/70 (2006.01)

Patent

CA 1130243

FAIL-SAFE STOP ARRANGEMENT FOR CRANE BOOM EXTENSION CABLE Abstract of the Disclosure - 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 en- gaged by a stop block of the boom fly section to positively arrest its retractive movement before any damage can occur.

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