Anti-two block system for a crane assembly

A crane assembly, comprising:

• a boom, a cable, and a hook coupled to an end of the boom by the cable on a sheave, wherein the crane assembly is configured for lifting items via the hook;
• and
• an anti-two block system, comprising:
• (A) a rigid body, comprising:
• (i) a base;
• (ii) a pair of extensions projecting perpendicularly upward from the base, wherein the extensions extend outside the sheave on opposite sides thereof;
• and
• (iii) a fitting on upper ends of the extensions, wherein the fitting couples to a pin of the sheave such that the body is configured to rotate about the pin;
• (B) a sensor configured to detect upward loading of the body of the anti-two block system relative to a portion of the end of the boom;
• and
• (C) a spring biasing the body of the anti-two block system to the pin;
• wherein the weight of the body of the anti-two block system rotates the body such that the extensions are substantially aligned with the cable between the end of the boom and hook as the boom rotates.

A crane assembly comprising an anti-two block system, the anti-two block system comprising:

• (A) a rigid body, comprising:
• (i) a base;
• (ii) a pair of extensions projecting perpendicularly outward from the base, wherein each extension is configured to extend outside a side of a sheave of a boom of the crane assembly;
• and
• (iii) a fitting on an upper end of each of the extensions, wherein the fitting couples to a pin of the sheave such that the body is configured to rotate about the pin;
• (B) a sensor configured to detect upward loading of the body of the anti-two block system relative to an end of the boom;
• and
• (C) a spring biasing the body of the anti-two block system to the pin;
• wherein the weight of the body of the anti-two block system rotates the body such that the extensions are substantially aligned with a cable of the crane assembly between the end of the boom an a hook of the crane assembly as the boom rotates.