Indication means for indicating suitable conditions for the...

Details Indication means for indicating suitable conditions for the... Indication means for indicating suitable conditions for the...

B - Operations, Transporting

66

C

364/35

B66C 15/06 (2006.01) B66D 1/52 (2006.01)

Patent

CA 1083276

A B S T R A C T For a crane, carried by one of two stations movable relative to each other in a vertical plane, and adapted to permit a hook assembly when attached to a load on the other station to follow relative motion prior to lifting of the load, a lift-off indicator measures either the relative velocity or relative vertical accelerations of the two stations and from signals representing relative velocity of approach showing values between a maximum positive and negative, and relative acceleration acting away from the direction of approach indicates conditions suitable for initiating lifting.

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