Patent ID: 9310239
Filing Date: 2016-04-12
CPC Classification: B65B,G01F

Claim Text:
1. A powder metering apparatus, comprising a peripheral wall defining in part a metering chamber ( 2 ) having a powder metering volume ( 3 ) and an outlet opening ( 11 ), a powder supply line ( 10 ), a diaphragm ( 5 ) reciprocally movable in the metering chamber relative to the peripheral wall between a first position for applying a negative pressure ( 8 ) to the metering chamber ( 2 ) and a second position to empty the metering chamber, wherein the diaphragm ( 5 ) bounds the metering chamber ( 2 ) and the diaphragm ( 5 ), together with a diaphragm holder ( 6 ) on which the diaphragm ( 5 ) is fixed, is adapted to be adjusted relative to the outlet opening ( 11 ) in order to set the powder metering volume ( 3 ), the peripheral wall ( 4 ) of the metering chamber ( 2 ) is constructed from a material which is more elastic than the diaphragm holder ( 6 ) material, so that the diaphragm holder ( 6 ) is sealed on the peripheral wall ( 4 ) of the metering chamber ( 2 ) as the diaphragm holder is moved along the peripheral wall, thereby eliminating any separate elastomer seals for sealing the diaphragm holder ( 6 ) with respect to the peripheral wall ( 4 ).