Hydraulic device for forklift

Details Hydraulic device for forklift Hydraulic device for forklift

1998-06-09

2000-10-03

Kramer, Dean J.

Elevator, industrial lift truck, or stationary lift for vehicle

Industrial lift truck or required component thereof

Having safety cutoff control

187224, 187275, 187285, 414632, 414636, 414471, 414629, B66F 920

Patent

active

061259705

ABSTRACT:
A hydraulic device for a forklift is disclosed. The forklift includes a tilting mast and a fork supported by the mast so that the fork is lifted and lowered. A tilt cylinder operates to tilt the mast by means of oil supplied by a tilt valve. A restricting valve is arranged in an oil passage connecting the tilt cylinder with the tilt valve. When the mast is tilted with the fork carrying an object and located higher than a predetermined reference position, the restricting valve closes the oil passage so that the angle of the tilting mast is limited. A check valve is arranged between the tilt cylinder and the restricting valve. The check valve blocks oil flow from the tilt cylinder to the restricting valve so that the position of the mast is maintained. This prevents unintentional movement of the mast.

REFERENCES:
patent: 3007593 (1961-11-01), Hancock
patent: 3307656 (1967-03-01), Susag
patent: 3722723 (1973-03-01), Matthews
patent: 3831492 (1974-08-01), Young
patent: 3929244 (1975-12-01), Ekstrom
patent: 4459081 (1984-07-01), Reeves

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