Conveyors: power-driven – Conveyor system for arranging or rearranging stream of items – By laterally or vertically moving successive items in...
Patent
1975-02-28
1976-08-17
Blunk, Evon C.
Conveyors: power-driven
Conveyor system for arranging or rearranging stream of items
By laterally or vertically moving successive items in...
91394, 91396, B65G 2300, F15B 1522
Patent
active
039749100
ABSTRACT:
A piston and cylinder actuator is disclosed embodying means to control the acceleration and deceleration of the piston as it approaches the ends of its stroke. Such actuator is also disclosed as an intermittent drive for a machine system in which at least part of the drive connection is provided by a friction drive. The acceleration and deceleration control is arranged to prevent slippage in the drive. The acceleration and deceleration control includes a land positioned on each side of the piston, each formed with a plurality of axially spaced orifices. As the piston approaches one end of its stroke, one land projects through an associated seal which operates to progressively isolate the orifices from the main chamber to control deceleration. Such orifices are progressively uncovered as the piston moves away from its end position, and in one embodiment provides controlled acceleration. The other land functions in a similar manner to control piston acceleration and deceleration at the other end of the piston stroke. One of the lands is provided by a tubular element positioned around the piston rod and proportioned so that it does not significantly change the effective area of the piston as the land comes into or goes out of operation. The lands are proportioned to provide the same deceleration rates at each end of the piston stroke. In a second embodiment, a separate adjustable flow restriction is provided to control acceleration of the piston without materially affecting its deceleration.
REFERENCES:
patent: 2674093 (1954-04-01), Slomer
patent: 2911952 (1959-11-01), Peras
patent: 3122063 (1964-02-01), Chorkey
patent: 3238850 (1966-03-01), Desmarchelier
patent: 3476014 (1969-11-01), Churchill et al.
patent: 3677141 (1972-07-01), Lagerqvist et al.
patent: 3727518 (1973-04-01), Gooding
Blunk Evon C.
Valenza Joseph E.
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