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US 6,894,621 B2Granted
Crane safety devices and methods
OwnerJack B. Shawinventor
Life of this patent
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Abstract
An improved crane warning system that includes acceleration sensors, motion sensors, hydraulic sensors, remote communications and/or a camera. The crane warning system may include a crane warning device integrated into the device suspended from the crane.
Claims9
A crane safety device, comprising:
- a motion detector for detecting motion of a device suspended from a crane;
- an alarm that generates a visible or audible warning signal in response to the motion detector detecting motion of the suspended device;
- and
- a control for controlling the warning signal.
1 more element
Dependencies are inferred from the claim text.