Metering apparatus for plastic materials

Abstract

A metering device for plastic materials comprising a bin having a rotating feed disc at the bottom thereof. The feed disc has peripheral cogs which partially define a metering chamber. Facing the metering disc is an ejection disc having teeth meshing with the cogs for forcing material into the metering chamber and ejecting the material from the metering chamber through an opening in the side of the bin.

I claim: .[. 
     
       1.  A metering device for kneadable masses and the like comprising a supply bin having a floor, a rotatable feed disc with cogs projecting into the bin disposed on said floor, a rotatable ejection disc having teeth engaging said cogs to form a metering chamber, said teeth being arranged to force the content of the metering chamber out a discharge opening in the bin, a cover plate covering the metering chamber and projecting into the supply bin, the cogs extending to the coverplate, their height being equal to the height of the teeth on the ejection disc whereby during the metering a closed metering chamber is formed..]. .[.2. A metering device according to claim 1 wherein the coverplate is sloped at the entry side to 
     
     
        avoid overloading of the metering chamber..]. 3. A metering device according to claim .[.2.]. .Iadd.7 .Iaddend.wherein the coverplate is provided with .Iadd.the means for allowing escape in the form of .Iaddend.a slot for the release of the excess mass displaced by cogs from 
     
     
        the spaces between the teeth of the ejection disc. 4. A metering device according to claim 3 wherein a release recess is formed in the wall of the supply bin to prevent excessive compaction of the kneadable mass in the metering chamber.  .[.5. A metering device according to claim 1 wherein the discharge opening has a comminuting grating disposed thereon for 
     
     
        dividing the metered material..]. 6. A metering device for kneadable masses and the like comprising a supply bin having a floor, a rotable feed disc with cogs projecting into the bin disposed on said floor, a rotable ejection disc having teeth engaging said .[.cog.]. .Iadd.cogs .Iaddend.to form a metering chamber .Iadd.between cogs.Iaddend., said teeth being arranged to force the content of the metering chamber out a discharge opening in the bin, a coverplate covering the metering chamber and projecting into the supply bin, .Iadd.the cover plate closing the top of the metering chamber adjacent the discharge opening, .Iaddend.a triangular wiper fixed to said coverplate having two curved sides, one adjacent the outer circumference of the ejection disc and the other adjacent the inner circumference of the cogs, the cogs .[.extend.]. .Iadd.extending .Iaddend.to the coverplate and their height being equal to the height of the teeth on the ejection disc whereby during the metering .Iadd.a .Iaddend.completely closed metering chamber is formed.Iadd., and means for allowing kneadable mass between the teeth to escape in a direction other than to the discharge opening during engagement of the teeth with the cogs.Iaddend...Iadd. 7. A metering device for kneadable masses and the like comprising a supply bin having a floor, a rotatable feed disc with cogs projecting into the bin disposed on said floor, a rotatable ejection disc having teeth engaging said cogs to form a metering chamber between cogs, said teeth being arranged to force the content of the metering chamber out a discharge opening in the bin, a cover plate covering the metering chamber and projecting into the supply bin, the cover plate closing the top of the metering chamber adjacent the discharge opening, the cogs extending to the coverplate, their height being equal to the height of the teeth of the ejection disc whereby during the metering a closed metering chamber is formed, means for allowing kneadable mass between the teeth to escape in a direction other than to the discharge opening during engagement of the teeth with cogs, and wherein the coverplate is sloped at the entry side to avoid overloading of the metering chamber. .Iaddend..Iadd. 8. A metering device for precisely metering kneadable masses and the like, comprising: a supply bin having a floor and a discharge opening adjacent the floor in a side wall thereof, a rotatable feed disc with cogs projecting upwardly from a top face thereof into the bin, the feed disc disposed on the bin floor, a shaft attached to the feed disc for driving the same, a freely rotatable ejection disc having teeth engaging said cogs to form a series of movable metering chambers, between cogs, the bottom face of the ejection disc rotatable closely adjacent the top face of the feed disc, the ejection disc teeth being arranged to force the content of each successive metering chamber out the discharge opening in the bin, a cover plate covering each successive metering chamber and projecting into the supply bin, the coverplate closing the top of each successive metering chamber adjacent the discharge opening and also journalling the freely rotatable ejection disc for rotational drive from the feed disc, the cogs extending to the bottom of the coverplate, the height of the cogs being equal to the height of the teeth of the ejection disc whereby during metering a series of successive closed metering chambers are formed one at a time adjacent the discharge opening and the contents are discharged through the discharge opening in precisely metered amounts corresponding to the volume of the metering chamber, and means for allowing kneadable mass between the teeth to escape in a direction other than to the discharge opening during engagement of the teeth with the cogs..Iaddend..Iadd. 9. A metering device according to claim 8 wherein the discharge opening has a comminuting grating disposed thereon for dividing the metered material forced through the discharge opening by teeth of the ejection disc. .Iaddend. .Iadd. 10. A metering device according to claim 6 wherein the coverplate at the entry side thereof is beveled for facilitating entry of kneadable mass in the metering chamber. .Iaddend..Iadd. 11. A metering device according to claim 10 wherein a release recess is formed in the wall of the supply bin to prevent excessive compaction of the kneadable mass in the metering chamber. .Iaddend.