B - Operations – Transporting – 66 – D
Patent
B - Operations, Transporting
66
D
267/56, 254/81,
B66D 3/18 (2006.01)
Patent
CA 1102363
ABSTRACT OF THE DISCLOSURE The present invention provides in a load handling sys- tem which includes a hoist, means for suspending said hoist, a chain suspended in operative association from said hoist, means for attaching said chain to a load, said hoist including a drive sprocket engaging said chain and power operated means for driving said drive sprocket at substantially constant angular velocity to effect variation in the chain length between the drive sprocket and the load whereby correspondingly to raise and lower the load, the driving of the chain by the drive sprocket inherently setting up a vertically oscillatory excitation superimposed on the steady vertical motion of the chain whereby as said variation in chain length inherently causes the system to experience a continuously varying natural frequency, said oscillatory excitation sets up a- resonant response in the load system when said natural frequency coincides with the fundamental or a significant harmonic frequency of said excitation wherein excessive oscillatory motion and forces are imposed on the system, the improvement which comprises: con- trol means in said system for obtaining a controlled amplitude of relative motion within such control means in response to said oscillatory motion and for creating a damping force related to said controlled amplitude which significantly reduces said exces- sive oscillatory motion and forces.
333877
Columbus Mckinnon Corporation
Marks & Clerk
LandOfFree
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