B - Operations – Transporting – 66 – C
Patent
B - Operations, Transporting
66
C
212/41
B66C 23/90 (2006.01)
Patent
CA 1138825
ABSTRACT OF THE DISCLOSURE 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, to and wherein the conventional manual controls are disabled/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.
365928
Couture Raymond
Couture Raynald
Lesperance Pierre
Systeme Electronique Rayco Ltee
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