Method and apparatus for preventing boom overload

Details Method and apparatus for preventing boom overload Method and apparatus for preventing boom overload

1985-09-16

1987-04-28

Peters, Jr., Joseph F.

Traversing hoists

With haul-in line

212261, B66C 1318

Patent

active

046607293

ABSTRACT:
A boom overload protection apparatus generally used in the protection of derrick-type hydraulic equipment having a boom or power arm for lifting or maneuvering heavy objects. A sensing rod is longitudinally connected to said boom in such manner as to sense boom overload relative to a predetermined allowable degree of flex. As boom overload is sensed, the sensing rod mechanically actuates a sensing valve through tensional or compressive forces applied thereto. The sensing valve, in turn, releases the fluid pressure in pressure release lines connected to overstress valve means. This release of fluid pressure actuates the overstress valve means which is connected in controlling relation to each hydraulic cylinder and winch drive to thereby disable boom stress-inducing operation of the same until such over-stress condition may be relieved.

REFERENCES:
patent: 3447692 (1969-06-01), Thomas
patent: 3952879 (1976-04-01), Grove
patent: 3963127 (1976-06-01), Eriksson
patent: 4027772 (1977-06-01), Garber
patent: 4135632 (1979-01-01), Berkel
patent: 4368824 (1983-01-01), Thomasson

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