Fluent material handling – with receiver or receiver coacting mea – Diverse fluid containing pressure filling systems involving... – Filling with exhausting the receiver
Reexamination Certificate
2000-08-07
2001-11-20
Jacyna, J. Casimer (Department: 3751)
Fluent material handling, with receiver or receiver coacting mea
Diverse fluid containing pressure filling systems involving...
Filling with exhausting the receiver
C141S044000, C141S046000, C141S065000, C141S286000, C222S053000, C222S152000, C222S226000
Reexamination Certificate
active
06318418
ABSTRACT:
PRIOR ART
The invention relates to a metering apparatus for pourable bulk material, of the kind known for instance from German Patent Disclosure DE 39 15 144A1. The known metering apparatus, embodied as a worm metering apparatus, has an annular barrier element, preferably of sintered metal, on its metering tube end; via a line, the barrier element communicates with a negative-pressure source. Downstream of the metering end, the ring element is subjected to negative pressure, causing air located in the admission cross section of the ring element to be aspirated away. As a result, the metering tube in the region of the ring element becomes clogged with product material, so that product material is no longer dispensed from the metering tube any longer, for instance into a packaging container. The known metering apparatus has the disadvantage that over the course of successive metering operations, the pores of the gas-permeable ring element become plugged with product particles, thus impairing its function.
An object of the invention is therefore to refine the know metering apparatus for pourable bulk material in such a way that a function of the metering apparatus is always assured over a high number of metering operations. This object is attained with the characteristics of the body of claim
1
.
Further advantages and advantageous refinements of the metering apparatus of the invention for pourable bulk material will become apparent from the description set forth herein.
REFERENCES:
patent: 2879809 (1959-03-01), Vogt
patent: 3788368 (1974-01-01), Geng et al.
patent: 4974646 (1990-12-01), Martin et al.
patent: 4976296 (1990-12-01), Pope
patent: 6021821 (2000-02-01), Wegman
patent: 6024141 (2000-02-01), Wegman
patent: 6102088 (2000-08-01), Wegman
Ettenhofer Anton
Grossmann Guenter
Greigg Ronald E.
Jacyna J. Casimer
Robert & Bosch GmbH
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