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A diluting station and a pipetting station for a machine such as a biological sample testing machine. The diluting station has a rotating shot tube that fills with diluent without the need for priming when the shot tube is in a vertically inclined orientation, and which dispenses the diluent into a

A diluting station and a pipetting station for a machine such as a biological sample testing machine. The diluting station has a rotating shot tube that fills with diluent without the need for priming when the shot tube is in a vertically inclined orientation, and which dispenses the diluent into a receptacle when the shot tube is rotated to a downward orientation. A thimble valve is placed in the shot tube to control the flow of diluent into the valve. The pipetting station includes a cylindrical housing storing a plurality of straws and a concentric rotating drum that sweeps a straw into a straw withdrawal slot. A tubular tapered transfer pin is inserted into the straw frictional into engagement with the straw. The tubular transfer pin rotates the straw out of the slot into a generally downward orientation towards a receptacle containing a fluid. The pin and straw are lowered so as to place the end of the straw into the fluid. The fluid is withdrawn into the straw by means of vacuum applied to the tubular tapered transfer pin. The pin and straw are then raised out of the fluid. The fluid can then be deposited into a second receptacle that is moved below the straw and transfer pin by lowering the straw into the second receptacle and releasing the vacuum.

대표청구항 ▼

An automatic rotating system for dispensing a controlled volume of fluid into a receptacle, comprising: a source of said fluid; a shot tube comprising a tip portion, a hollow body, and a fluid port in said hollow body; a conduit for conducting said fluid from said source to said fluid port of said s

An automatic rotating system for dispensing a controlled volume of fluid into a receptacle, comprising: a source of said fluid; a shot tube comprising a tip portion, a hollow body, and a fluid port in said hollow body; a conduit for conducting said fluid from said source to said fluid port of said shot tube; means for securely receiving said shot tube and for rotating said shot tube from a first position, wherein said tip portion is oriented at an incline above horizontal relative to said hollow body during filling of said shot tube, to a second position, wherein said tip portion is oriented downward towards said receptacle during dispensing of said fluid, and a valve for controlling the flow of said fluid through said fluid port into said hollow body of said shot tube; whereby air within said shot tube may be eliminated from said shot tube during filling of said shot tube in said first position with said fluid.