Device for lifting loads, especially heavy loads, in a stepwise

Details Device for lifting loads, especially heavy loads, in a stepwise Device for lifting loads, especially heavy loads, in a stepwise

1982-01-29

1984-01-24

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Step-by-step traveling bar

Pawl actuated

B66F 108

Patent

active

044271816

ABSTRACT:
A device for stepwise lifting heavy loads, wherein one or more units each consists of a vertical support member resting on a rigid bed and accommodating a lifting member vertically displaceable in the support member; supporting elements shorter than the length of displacement of the lifting member, one such supporting element being insertable into the support member above the lifting member in its lowered position in order, upon upward displacement of the lifting member, to be introduced into a vertical guiding tube aligned with the support member, the load resting on top of the uppermost supporting element in the guiding tube; and a support plate insertable between the guiding tube and the support member in engagement with the top end surface of the latter, the support plate permitting vertical displacement of the supporting element resting on the lifting member when the supporting element is situated partly within the support member, but preventing downward displacement of the supporting element when it is completely inserted into the guiding tube.

REFERENCES:
patent: 3396944 (1968-08-01), Jansz
patent: 3416284 (1968-12-01), Adler
patent: 3881687 (1975-05-01), Johansson
patent: 3895778 (1975-07-01), Ahlgren

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