Swing mechanism

Details Swing mechanism Swing mechanism

1975-03-17

1977-02-15

Werner, Frank E.

91420, 91454, G02F 332

Patent

active

040078450

ABSTRACT:
Backhoe swing apparatus including a backhoe swing bracket for supporting a backhoe for side-to-side swinging movement. A pair of hydraulic actuators are connected with the swing bracket for actuating the swing bracket in opposite directions. The hydraulic actuators are of the piston and cylinder type, and are controlled by a hydraulic system including a pair of hydraulic lines for conducting hydraulic fluid to and from each of the hydraulic actuators. A normally open pressure reducing valve in one of the hydraulic lines is operable to control pressure to one of the actuators to actuate the swing bracket in one direction and to thereby limit the pressure of fluid flowing to the actuator. Simultaneously, flow from the other actuator through the other hydraulic line is controlled by a first normally closed metering valve, which opens a permit such flow only when a predetermined minimum pressure exists in the other hydraulic line. A second normally closed metering valve controls flow of hydraulic fluid from the first hydraulic actuator when the swing bracket swings in the opposite direction, and permits such flow only when a predetermined minimum pressure exists in the other line.

REFERENCES:
patent: 3033170 (1962-05-01), Norton et al.
patent: 3047171 (1962-07-01), Long
patent: 3630120 (1971-12-01), Carlson
patent: 3795178 (1974-03-01), Roche
patent: 3872985 (1975-03-01), Short

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