Delayed-action empty-seat safety interlock for forklift controls

Details Delayed-action empty-seat safety interlock for forklift controls Delayed-action empty-seat safety interlock for forklift controls

1998-12-07

2000-07-25

Olszewski, Robert P.

Material or article handling

Elevator or hoist and loading or unloading means therefor

Elevator wherein means comprises guide mounted for relative...

414620, 414631, 187223, B66F 924

Patent

active

060929766

ABSTRACT:
A tilt control valve controls the flow of hydraulic oil to actuate the tilt cylinders of a forklift mast. The tilt control valve is switched between two positions by the forklift operator by means of a tilt lever. When at one position, the tilt control valve stops flow of oil to the tilt cylinders, thereby prohibiting tilting of the mast. When at the other position, the tilt control valve permits oil flow to the tilt cylinders, thereby allowing tilting of the mast. A control valve is located between the tilt cylinders and the tilt control valve. A seat switch detects whether or not the operator is sitting on the seat. A CPU permits the operator to continue to operate the tilt cylinders to tilt the mast when out of the seat for a brief period. However, after the brief period, the CPU closes the control valve to prevent movement of the mast unless the operator has returned to the seat. When the mast reaches a predetermined maximum acceptable tilt angle, the CPU also closes the control valve, thereby prohibiting motion of the tilt cylinders.

REFERENCES:
patent: 3827532 (1974-08-01), Minich et al.
patent: 3854616 (1974-12-01), Willis et al.
patent: 3907141 (1975-09-01), Ahrendt et al.
patent: 4411582 (1983-10-01), Nakada
patent: 4683373 (1987-07-01), Tupman
patent: 5184699 (1993-02-01), Aoki et al.
patent: 5281076 (1994-01-01), Lehman

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