Mechanism for suppressing displacement of travelling crane

Details Mechanism for suppressing displacement of travelling crane Mechanism for suppressing displacement of travelling crane

1990-04-06

1991-04-16

Peters, Jr., Joseph F.

Traversing hoists

Having vertically swinging boom

Having means to swing boom vertically

212146, 212182, 60412, 91437, B66C 2326, B66C 1306, F16D 3162

Patent

active

050075446

ABSTRACT:
According to the displacement suppressing mechanism for a travelling crane of the present invention, when a mode selection switch selects an operation mode and a detected value by a boom position detecting means is smaller than a lower limit value of an appropriate travelling range, a change-over valve for replenishment capable of changing over the position of an auxiliary pressure oil source selectively to a communicating position for communication of the auxiliary pressure oil source with a first oil chamber of a boom raising and lowering hydraulic cylinder and a communication cutting-off position is shifted to the communicating position by a control means to supply a predetermined amount of pressure oil to the first oil chamber of the hydraulic cylinder.

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: 4341149 (1982-07-01), Dezelan
patent: 4367673 (1983-01-01), Krueck et al.
patent: 4674638 (1987-06-01), Oliphant

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