Handling: hand and hoist-line implements – Utilizing fluid pressure – Venturi effect
Patent
1990-03-29
1991-07-30
Focarino, Margaret A.
Handling: hand and hoist-line implements
Utilizing fluid pressure
Venturi effect
901 40, B66C 102
Patent
active
050354566
ABSTRACT:
This invention provides improved body length adjustment value structure for a vacuum powered lifting system of the type that embodies a variable length lifting body responsive to the differential of pressure inside that body with atmospheric pressure to resolve critical manual control problems. Thus control is provided by proportional movement of a control member over a substantially linear range producing a smooth progressive movement of the lifting mechanism. This permits non-critical lowering and release of a work load object by unskilled operators. Thus, an air injection valve with an air release port, is positioned within the lifting body having an elongated slot operable over a control range proportionately change the body length by release of a progressively increasing flow of air into the body to increase air pressure and body length over the critical range of lowering and releasing the work load object in response to a corresponding substantially linear movement of the control member. Variable adjustment value structure establishes a known upper lift limit by control of the length of the body both under loaded and unloaded conditions, and provisions are made to keep a vacuum responsive work object grasping mechanism continuously operable.
REFERENCES:
patent: 3558171 (1971-01-01), Netsch et al.
patent: 3677598 (1972-07-01), Becker
patent: 3743340 (1973-07-01), Williamann
patent: 4266905 (1981-05-01), Birk et al.
patent: 4413853 (1983-11-01), Andersson
Brown Laurence R.
Focarino Margaret A.
Kramer Dean J.
Roberts, Jr. John S.
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