Implements or apparatus for applying pushing or pulling force – Step-by-step traveling bar – Pawl actuated
Patent
1976-09-15
1979-08-28
Peters, Jr., Joseph F.
Implements or apparatus for applying pushing or pulling force
Step-by-step traveling bar
Pawl actuated
267162, 294 82R, B66D 318
Patent
active
041658639
ABSTRACT:
In a load system which involves a powered chain hoist wherein raising or lowering of a load is effected by a rotating drive sprocket over which the chain is trained, the amplitude of motion due to resonant response of the load system as a consequence of coincidence between the natural frequency of the load system and the frequency of oscillatory excitation produced by the chain/sprocket drive is significantly reduced by providing an energy dissipation device in series with the load. This device involves a spring mechanism which permits a limited motion at the resonant condition, in combination with a controlled damping factor. The spring compliance of the device normally will lie in the range of about 1/2-3 times the spring compliance of the active length of the chain at the resonant condition and the relation between the spring rate of the device and the effective damping factor is perferably such that the spring rate divided by the damping factor will be at least about 0.006 seconds. The device so tuned is also effective in rapidly attenuating the amplitude of the transient motion induced when the hoist is suddenly stopped or started.
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Columbus McKinnon Corporation
Peters Jr. Joseph F.
Underwood D. W.
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