Implements or apparatus for applying pushing or pulling force – Step-by-step traveling bar – Clutch actuated
Patent
1978-01-26
1979-07-10
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Step-by-step traveling bar
Clutch actuated
B66F 102
Patent
active
041605390
ABSTRACT:
In a multipurpose jig apparatus of the type including a length of rigid pipe and a plurality of tail stops slidably mounted on the pipe and releasably gripping it so as to resist movement therealong in one direction but permit movement along the pipe in the other direction, a hand-operated jack is removably mounted on the pipe and in association with two tail stops for forcing such stops along the pipe in reaction to a mechanical advantage developed by a lever component of the jack. In one embodiment, the jack has an elongate, hand operated lever that is pivotally connected to a fulcrum support which in turn is integrally formed at one end of an otherwise conventional tail stop. An end of the lever opposite that of the handle is provided with cam and hook elements which couple the lever to another, adjacent tail stop. The handle end of the lever is grasped and stroked back and forth so as to cause the two tail stops and the lever to coact in an alternating push-pull sequence which advances the tail stops and the jack along the pipe in the direction in which the stops are free to move. Any counteracting force in the opposite direction is resisted by the unidirectional gripping action of the tail stops. In another embodiment, the jack lever is detachably mounted on the pipe by a C-shaped collar which fits around the pipe and is shouldered against one end of a first conventional tail stop. The C-shaped collar has an integrally formed fulcrum support on which the lever of the jack is pivotally mounted, and the end of the lever opposite the handle end is provided with camming elements which act to push a second and adjacent tail stop away from the first stop. Both tail stops and the jack are progressively advanced along the pipe by using the mechanical advantage of one stroke of the lever to push the first tail stop along the pipe in reaction to the fulcrum support and the C-shaped collar which are braced and thus held immobile by the first tail stop. Then, during the return stroke of the jack lever, the first tail stop and the C-shaped collar shouldered thereby are manually slipped up against the second tail stop whereafter the sequence is repeated. The mechanical advantage which enables the tail stops to be jacked along the pipe, over any desired length of travel, greatly enhances the usefulness of the jig apparatus when employed in either a clamping or spreading configuration, and furthermore enables new uses of the jig apparatus including hoisting, pulling and jacking up loads.
REFERENCES:
patent: 2217403 (1940-10-01), Gunn
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