Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1978-11-09
1980-12-02
Kunin, Stephen G.
Material or article handling
Vertically swinging load support
Shovel or fork type
212 39R, 340685, B66C 2300, B66F 900, E02F 300, B66C 1348
Patent
active
042368642
ABSTRACT:
A safety control system for a crane adapted to prevent exceeding the uppermost safe elevation of each articulated section of a boom and the safe swinging limits right and left of the boom, which is also adapted to allow the crane operator to preset the safe limits without tools and without leaving the cab of the crane, and wherein the conventional manual controls are disabled to solely allow the required enabling to bring back the boom in the fully operative range. This safety control system preferably includes an electrical elevation sensor for each of two articulated boom sections, an electrical swinging sensor discriminating between left and right safe swinging limits, a warning device indicating the arrival at a limit, a 3-way solenoid valve to regulate the supply of hydraulic fluid to the boom elevation and swinging actuators, and to the conventional manual controls, and relays to control the energization of the 3-way valve, the warning device, and a brake to stop swinging of the boom. The electrical elevation sensors are combined into a unit providing correlation between the elevation limits of the boom sections and also providing for simple remote setting of these elevation limits.
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Couture Raymond
Couture Raynald
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