Traversing hoists – With haul-in line
Patent
1989-08-09
1990-09-04
Peters, Jr., Joseph F.
Traversing hoists
With haul-in line
212146, 212149, 212153, 212182, 212261, 212265, 60413, 60469, 91437, B66C 1312, B66C 2356
Patent
active
049537237
ABSTRACT:
An apparatus for damping quaky movements of a mobile type crane includes the prohibition of the formation of a closed damping circuit through the opposing oil chambers of a boom uplifting cylinder in working mode or a crane operation in travel mode of the crane, enhancing safety in crane operation while ensuring effective quake damping action in vehicle travel. The apparatus includes a vehicle body supported on driven wheels; a boom pivotally supported on the vehicle body through a hydraulic cylinder for pivoting movements about a horizontal shaft; main hydraulic pumps connected through a transmission mechanism to an engine mounted on the vehicle body and switchable between on- and off-positions; a direction control valve for selectively supplying and draining the discharge oil pressures of the main pumps to and from a first load-holding main oil chamber and an opposing second oil chamber of the cylinder; a counter-balancing valve provided between the cylinder and directionh control valve; an accumulator provided between the cylinder and counter-balancing valve for suppressing quaky movements of the vehicle body; a mode selector means for switching the mode of operation between a vehicle travel mode forming a closed circuit through the first and second oil chambers and in communication with the accumulator, and a working mode cancelling the closed circuit and supplying and draining oil pressures separately to and from the first and second oil chambers; and a controller adapted to permit a switch to the travel mode position of the travel mode selector only when the main pumps are in an off state.
REFERENCES:
patent: 3814265 (1974-06-01), Miller
patent: 3922854 (1975-12-01), Coeurdera
patent: 4046270 (1977-09-01), Baron et al.
patent: 4085587 (1978-04-01), Garlinghouse
patent: 4142368 (1979-03-01), Mantegani
patent: 4341149 (1982-07-01), Dezelan
patent: 4367673 (1983-01-01), Krueck et al.
patent: 4674638 (1987-06-01), Oliphant
Katada Tsuyoshi
Kuchiki Kiyotsuna
Saotome Yoshimi
Johnson R. B.
Kabushiki Kaisha Kobe Seiko Sho
Peters Jr. Joseph F.
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