Glass manufacturing – Control responsive to condition sensing means
Patent
1999-02-02
2000-06-27
Silverman, Stanley S.
Glass manufacturing
Control responsive to condition sensing means
65161, 65162, 65269, 65272, 65276, 65279, 65283, 65292, 65DIG13, C03B 2311
Patent
active
060792302
ABSTRACT:
The apparatus for preparing quartz micropipettes includes a pair of carriers mounted on a linear ball bearing guide which grasp opposite ends of a quartz glass capillary tube. A pair of miniature torches fueled by a mixture of oxygen and propane simultaneously heat a portion of the center of the capillary tube and an inverted U-shaped bar disposed between the torches in propinquity to the capillary tube. A cable having one end attached to one of the carriers and the other end attached to the core of a solenoid, the intermediate portion of the cable being wound around a pulley and attached to the second carrier, is used to pull the capillary tube in opposite directions as the tube softens. The cable is also wound around the axle of an optical encoder assembly which sends an electrical signal to a computer based upon either the distance or velocity at which the tubing is pulled apart. When the distance or velocity reaches a predetermined limit, the torches are shut off and the solenoid activated to separate the capillary tube into two symmetrically formed micropipettes, the U-shaped bar providing sufficient residual heat to ensure symmetry.
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Colaianni Michael P.
Litman Richard C.
Silverman Stanley S.
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