Boom stop and back hitch compensating system

Details Boom stop and back hitch compensating system Boom stop and back hitch compensating system

1975-11-10

1977-02-01

Spar, Robert J.

Traversing hoists

Overhead

Cable

212 59A, B66C 2300

Patent

active

040057801

ABSTRACT:
The back hitch assembly for a lift or tower crane includes a tension sensing device which regulates the pressure delivered to the boom stop or hold back cylinders such that as the boom hoist line and back hitch become slack when the load line is relieved more pressure is delivered to the cylinders to counteract the rearward pull on the boom or tower due to the suspended weight of the masts and equalizer assemblies.

REFERENCES:
patent: 2627985 (1953-02-01), Sathre et al.
patent: 3092261 (1963-06-01), Nesbit
patent: 3278925 (1966-10-01), Saunders et al.
patent: 3871527 (1975-03-01), Schimmeyer et al.

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