Device for the repeated reproducible delivery of definite variable amounts by volume
First Claim
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1. Apparatus adapted for variable predeterminable settings to effect the repeated, reproducible delivery of definite volumetric amounts of liquid, and with permissive interim cleaning of the apparatus without altering the predetermined delivery setting thereof;
- and comprising a syringe cylinder and piston assembly having a piston with actuating means for the piston;
a micrometer screw assembly;
mounting means connecting the said assemblies for relative movement therebetween, and stop means adjustably located by said micrometer screw assembly to a pre-selected position for limiting the intake stroke of the syringe piston in accordance with the predetermined setting of the micrometer screw assembly as determined by the preselected volume to be delivered from the syringe cylinder on the exhaust stroke of the syringe piston, and another position upon relative movement of said assemblies with the stop means shiftable to permit full intake and exhaust strokes of the syringe piston, as for interim cleaning or rinsing of the syringe cylinder, without altering the predetermined setting of the stop means by the micrometer screw assembly upon return to the pre-selected position of the assemblies.
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Abstract
A combined micrometer screw and syringe assembly with variable predeterminable settings providing for the repeated, exactly reproducible delivery of predetermined variable volumetric amounts of liquid from the syringe but with permissive interim availability of the entire volume of the syringe for rinsing and cleaning thereof without altering any predetermined setting for the definite amount to be delivered therefrom.
65 Citations
11 Claims
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1. Apparatus adapted for variable predeterminable settings to effect the repeated, reproducible delivery of definite volumetric amounts of liquid, and with permissive interim cleaning of the apparatus without altering the predetermined delivery setting thereof;
- and comprising a syringe cylinder and piston assembly having a piston with actuating means for the piston;
a micrometer screw assembly;
mounting means connecting the said assemblies for relative movement therebetween, and stop means adjustably located by said micrometer screw assembly to a pre-selected position for limiting the intake stroke of the syringe piston in accordance with the predetermined setting of the micrometer screw assembly as determined by the preselected volume to be delivered from the syringe cylinder on the exhaust stroke of the syringe piston, and another position upon relative movement of said assemblies with the stop means shiftable to permit full intake and exhaust strokes of the syringe piston, as for interim cleaning or rinsing of the syringe cylinder, without altering the predetermined setting of the stop means by the micrometer screw assembly upon return to the pre-selected position of the assemblies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- and comprising a syringe cylinder and piston assembly having a piston with actuating means for the piston;
Specification