Handling: hand and hoist-line implements – Utilizing fluid pressure – Venturi effect
Patent
1975-04-21
1976-09-28
Cherry, Johnny D.
Handling: hand and hoist-line implements
Utilizing fluid pressure
Venturi effect
214650SG, 214652, B66C 102, B66F 918
Patent
active
039827828
ABSTRACT:
Lifting apparatus including two pairs of opposed backing plates of curved cross section mounted for horizontal swinging movement, each plate being mounted for horizontal and vertical swinging movement. Each backing plate has a resilient seal secured thereto in the form of a continuous pneumatic tube which projects outwardly from the plate to form a cushion and a seal, and is arranged with side sections and end sections forming a suction space. When each pair of plates is moved against a cylindrical article, suction is applied to the suction space bounded by the pneumatic tube to draw the article against the latter. This also draws the article against vertical friction plates on each backing plate and located adjacent side sections of the pneumatic tube thereof.
REFERENCES:
patent: 2604220 (1952-07-01), Frischmann
patent: 2683546 (1954-07-01), Sherriff
patent: 2942745 (1960-06-01), Horton
patent: 3147872 (1964-09-01), Olson
patent: 3219379 (1965-11-01), Ames
patent: 3227299 (1966-01-01), Draxler
patent: 3260392 (1966-07-01), Harris
patent: 3276611 (1966-10-01), Horton
patent: 3376061 (1968-04-01), Harris et al.
patent: 3627369 (1971-12-01), Nixon
patent: 3696596 (1972-10-01), Wegscheid
Cherry Johnny D.
MacMillan Bloedel Limited
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