Backhoe swing mechanism

Details Backhoe swing mechanism Backhoe swing mechanism

1982-06-07

1985-02-19

Spar, Robert J.

Material or article handling

Vertically swinging load support

Shovel or fork type

91176, 91178, 91185, E02F 332

Patent

active

045002509

ABSTRACT:
An improved hydraulic swing mechanism is disclosed for operation of the boom assembly of a backhoe or similar implement. The swing mechanism includes a pair of double-acting hydraulic motors pivotally interconnected between the backhoe frame and the backhoe boom assembly. A novel multi-position sequencing spool valve is disposed in fluid communication between the head ends of the hydraulic motors and a manually operated directional control valve which directs swinging movement of the boom assembly. A straight-forward valve control linkage operatively connects the sequencing spool valve with the boom assembly so that the spool valve is selectively operated as the boom assembly is pivoted through its arc of travel. An improved hydraulic cushioning circuit is provided in association with the sequencing spool valve, with the entire system providing improved operation of the boom assembly, with significant improvement in the hydraulic cushioning and torque characteristics of the system.

REFERENCES:
patent: 4065010 (1977-12-01), Worback
patent: 4341501 (1982-07-01), Maurer et al.
patent: 4389153 (1983-06-01), Pedersen et al.
patent: 4403905 (1983-09-01), Maurer et al.
patent: 4419040 (1963-12-01), Pedersen et al.

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