Automatic self-leveling forks

Details Automatic self-leveling forks Automatic self-leveling forks

1973-10-02

1977-07-12

Croyle, Carlton R.

Motors: expansible chamber type

Differential

60484, F15B 1120, F15B 1122

Patent

active

040346498

ABSTRACT:
Apparatus for automatically leveling the forks of vertically moveable hoist arms. In a typical embodiment, the arms are used on refuse collection vehicles for lifting and dumping detachable containers into the body of the vehicle. The arms are pivotally mounted at one end on the vehicle and the opposite ends of the arms has fork devices for engaging brackets on opposite end walls of the detachable containers. Swinging movement of the arms and of the forks is accomplished by means of hydraulic cylinders or rams. A hydraulic pump supplies fluid under pressure to the arm cylinders for raising the arms. A portion of the fluid is conducted to the fork cylinder by means of a gear or vane type flow divider, so that the rate of extension of the piston in each fork cylinder is at a predetermined ration of the displacement of the arm piston. This causes the forks to swing downwardly at a predetermined rate while the arms are being raised toward a dumping position, thereby maintaining the container approximately horizontal until it is in position to be inverted for dumping.

REFERENCES:
patent: 3039266 (1962-06-01), Schenkelberger
patent: 3120314 (1964-02-01), King
patent: 3140787 (1964-07-01), Clar
patent: 3179120 (1965-04-01), Erickson et al.
patent: 3494259 (1970-02-01), Sumida
patent: 3495610 (1970-02-01), Van Aken
patent: 3679179 (1972-07-01), Praddaude

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