초록 ▼

Apparatus for control of multiple liquid dispensing providing accurate metering, close spacing of the fluids dispensed and rapid cycling. One embodiment contemplates transferring liquids from a multiplicity of containers to a corresponding multiplicity of wells in a microtitration test tray, and inc

Apparatus for control of multiple liquid dispensing providing accurate metering, close spacing of the fluids dispensed and rapid cycling. One embodiment contemplates transferring liquids from a multiplicity of containers to a corresponding multiplicity of wells in a microtitration test tray, and includes a multiplicity of resilient conduits extending from the containers into a common pinch type valve that clamps the ends of the conduits closed or permits them to open for liquid discharge.

대표청구항 ▼

Apparatus for the rapid accurately metered dispensing of separate small amounts of liquid comprising a pinch valve having two relatively movable members, a plurality of individual liquid conducting conduits having resilient discharge terminals extending in closely spaced relation between said member

Apparatus for the rapid accurately metered dispensing of separate small amounts of liquid comprising a pinch valve having two relatively movable members, a plurality of individual liquid conducting conduits having resilient discharge terminals extending in closely spaced relation between said members, and actuating means for relatively moving said members between a valve closed position wherein all of said terminals are pinched shut between said members and a separated valve open position wherein said terminals are all free to spring to open condition, one of said pinch valve members being a reciprocable member and said actuating means comprising a piston connected to said reciprocable member and slidable in a cylinder, the interior of the cylinder being separated by said piston into two chambers, resilient means in one of said chambers biasing said piston in the direction to displace said reciprocable member to said valve open position, means for introducing air under pressure into the other chamber through a check valve, said air pressure exerting a force on said piston greater than said resilient means whereby said piston may be moved in the direction to displace said reciprocable member to pinch said terminals shut, and means for periodically introducing fluid pressure into said one chamber whereby the combined forces of fluid pressure and resilient means in said one chamber may periodically move said piston to displace said reciprocable member sufficiently to release all of said terminals for discharge of liquid during each period.