Patent ID: 6536615
Filing Date: 2003-03-25
Classification: B66C

Abstract:
An load moment indicator of a crane comprising:a boom having a hoist arm provided at an extreme end; a first hoist means for carrying out a first hoisting work, said first hoist means having a first winch, a first rope drawn out of said first winch and suspended from the extreme end of said boom, and a first hook suspended by said first rope; a second hoist means for carrying out a second hoisting work, said second hoist means having a second winch, a second rope drawn out of said second winch and suspended from said hoist arm, and a second hook suspended by said second rope; and a calculator for carrying out processing of preventing an overload on the basis of first and second hoist loads carried by said first and second hoist means, and for calculating a rated load for said first and second hoist means, said rated load being obtained by modifying one hoist load out of said first and second hoist loads by an amount related to the other of said first and second hoist loads.