Backhoe swing mechanism

Details Backhoe swing mechanism Backhoe swing mechanism

1981-12-10

1983-06-21

Spar, Robert J.

Material or article handling

Vertically swinging load support

Shovel or fork type

91176, 91417R, 414687, E02F 332, F15B 1504

Patent

active

043891535

ABSTRACT:
An improved hydraulic system is disclosed for a backhoe having a rotating boom operated by a hydraulic swing mechanism. The system includes a hydraulic rotary sequencing valve which is operatively connected with the swing tower which supports the rotating boom. During rotation of the swing tower and boom by the hydraulic motors of the backhoe, the rotary valve is operated to selectively direct pressurized fluid to the motors for improved torque characteristics. A hydraulic cushioning circuit is provided in association with the rotary sequencing valve so that hydraulic cushioning of the motors, and thus the boom, is effected during the approach of the boom toward its travel stops, eliminating the need for conventional cushioning mechanisms in the motors themselves, and improving overall performance of the machine.

REFERENCES:
patent: 3047171 (1962-07-01), Long
patent: 3407946 (1968-10-01), Pilch
patent: 3530766 (1970-09-01), Pilch
patent: 3630120 (1971-12-01), Carlson et al.
patent: 3757642 (1973-09-01), Schuermann
patent: 3872985 (1975-03-01), Short
patent: 4085855 (1978-04-01), Worback
patent: 4138928 (1979-02-01), Pilch
patent: 4341501 (1982-07-01), Maurer et al.

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