Pumps – Motor driven – Fluid motor
Patent
1990-12-18
1992-04-21
Bertsch, Richard A.
Pumps
Motor driven
Fluid motor
92 131, 417274, F04B 3502, F15B 1524
Patent
active
051062755
ABSTRACT:
Pump units comprising a metering reciprocating pump with adjustable length of stroke are used in packing machines for filling of packing containers with a metered quantity of flowable contents, e.g. yogurt. Adjustments in the length of stroke in order to adapt the amount of filling goods to the volume of the packing container interferes with the breaking sequence at the extreme position of the piston and alters the time for each pumping stroke. These drawbacks are avoided by means of an arrangement which includes a movable braking device for the piston as well as a valve arrangement which is linked to the braking device and serves to adapt the speed of the piston to the length of stroke.
REFERENCES:
patent: Re25873 (1965-10-01), Rutherford
patent: 1777293 (1930-10-01), Curtis
patent: 2937621 (1960-05-01), Herrmann
patent: 3685554 (1972-08-01), Encke
patent: 3760911 (1973-09-01), Porter
patent: 3793925 (1974-02-01), Collin
patent: 4309156 (1982-01-01), Gonner
patent: 4869397 (1989-09-01), Corniea
patent: 4964533 (1990-10-01), Allington
Galavotti Giorgio
Santi Franco
Bertsch Richard A.
Korytnyk Peter
Tetra Dev.-Co.
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