Traversing hoists – With haul-in line
Patent
1990-04-30
1991-02-26
Peters, Jr., Joseph F.
Traversing hoists
With haul-in line
212182, 60413, 91437, B66C 1306, B66C 2326, F16D 3162
Patent
active
049955179
ABSTRACT:
A mechanism for effectively suppressing vibrations in travel of mobile type crane includes; a boom lifting hydraulic cylinder connected between a vehicle body of the mobile crane and a boom; a main hydraulic pump; a direction control valve for supplying the discharge oil of the main hydraulic pump selectively to and from a first load-supporting oil chamber and an opposingly located second oil chamber of the boom lifting cylinder. A vibration suppressing accumulator is connected between the boom lifting cylinder and the direction control valve; a first change-over valve is selectively switchable between a travel mode position for forming a closed circuit through the first and second oil chambers and a working mode position for supplying the oil pressure independently to and from the first and second oil chambers; a second change-over valve is selectively switchable between a travel mode position for communicating the accumulator with the closed circuit and a working mode position for blocking oil flow from the closed circuit to the accumulator. Also provided are; a boom position detectors; a first selector for switching on and off oil pressure supply to the second oil chamber from an auxiliary oil pressure source; and a second selector for switching on and off oil pressure supply to the accumulator from an auxiliary oil pressure source.
REFERENCES:
patent: 3814265 (1974-06-01), Miller
patent: 3922854 (1975-12-01), Coeurderay
patent: 4046270 (1977-09-01), Baron et al.
patent: 4085587 (1978-04-01), Garlinghouse
patent: 4142368 (1979-03-01), Mantegani
patent: 4367673 (1983-01-01), Krueck et al.
patent: 4674638 (1987-06-01), Oliphant
Johnson R. B.
Kabushiki Kaisha Kobe Seiko Sho
Peters Jr. Joseph F.
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