Apparatus for weighing samples

Claim 2

Precision weighing apparatus for granular material comprising: a material-receiving hopper having an outlet disposed for gravitational flow of the material therefrom; weight-sensing mechanism; a collector carried by said mechanism for receiving material from said outlet; a material-diverting spout shiftable to and from a position directing the material from the outlet to the collector; structure for feeding the material to said spout in a uniform, steady flow; means operably interconnecting said mechanism and said spout for shifting the latter away from said position when the mechanism senses a predetermined amount by weight of said material in the collector; and a material lead-in ramp projecting upwardly from said collector into close proximity with the lower end of said spout for assuring weight registration of material between the spout and the collector as well as that deposited in the collector.

Claim 3

Material weighing apparatus as claimed in claim 1, wherein said spout is swingably attached to said hopper for oscillation to and from said position.

Claim 4

Material weighing apparatus as claimed in claim 1, said spout having an inlet in constant communication with said outlet as said spout is shifted to and from said position.

Claim 5

Weighing apparatus as claimed in claim 1, wherein said structure includes a pair of elongated, oppositely driven, resilient metering rolls above the collector in tangential engagement with one another for yielding along their line of interengagement to the grains of material as the grains are forced from above to below the rolls.

Claim 6

Precision weighing apparatus for granular material comprising: a material-receiving hopper having an outlet disposed for gravitational flow of the grains of material therefrom; weight-sensing mechanism; a collector carried by said mechanism for receiving material from said outlet; a pair of elongated, oppositely driven, resilient metering rolls above said collector in tangential engagement with one another for receiving the material and releasing the same to the collector in a uniform, steady flow as the individual grains deflect the rolls along their line of interengagement and are forced from above to below the rolls; a material-diverting spout shiftable to and from a position directing the flow from said rolls to said collector; and means operably interconnecting said mechanism and said spout for instantaneously shifting the latter away from said position when the mechanism senses a predetermined amount by weight of said material in the collector.

Claim 7

Precision weighing apparatus for granular material comprising: a material-receiving hopper having an outlet disposed for gravitational flow of the grains of material therefrom; weight-sensing mechanism; a collector carried by said mechanism for receiving material from said outlet; a pair of elongated, oppositely driven, resilient metering rolls above said collector in tangential engagement with one another for receiving the material and releasing the same to the collector in a uniform, steady flow as the individual grains deflect the rolls along their line of interengagement and are forced from above to below the rolls; a material-diverting spout shiftable to and from a position directing the flow from said rolls to said collector; and means operably interconnecting said mechanism and said spout for instantaneously shifting the latter away from said position when the mechanism senses a predetermined amount by weight of said material in the collector.

Claim 8

Weighing apparatus as claimed in claim 5, wherein said collector is provided with a device projecting upwardly therefrom into close proximity with the lower end of said spout for receiving the material immediately upon its departure from said spout to thereby assure weight registration of the material between the spout and the collector.

Claim 9

Weighing apparatus as claimed in claim 6, wherein said receiving device comprises a ramp.