Apparatus having coilable pulling element for drawing a monocrys

Details Apparatus having coilable pulling element for drawing a monocrys Apparatus having coilable pulling element for drawing a monocrys

1981-06-11

1983-01-04

Bernstein, Hiram

Chemical apparatus and process disinfecting, deodorizing, preser

Control element responsive to a sensed operating condition

Control element responds proportionally to a variable signal...

422249, C30B 1520

Patent

active

043671993

ABSTRACT:
The invention relates to an apparatus for drawing a monocrystal from a crucible by means of a coilable pulling element having the end that is located above the crucible secured a crystal-nucleus holder. The pulling element, which is preferably a steel cable, is connected to a lifting drive which is arranged on a platform which is rotatable about the pulling element. The lifting drive comprises a driven horizontal shaft with a longitudinally displaceable coiling drum thereon, onto which drum the pulling element can be tangentially coiled. The vertical speeds of the crystal-nucleus holder can be adjusted to speeds which differ greatly from each other by providing the lifting drive with a drive motor for rapid operation and a drive motor for flow operation, which motors act on the coiling drum by way of shafts which can be disconnected from each other by means of a clutch but which are disposed coaxially. In this arrangement, the drive motor for rapid operation is connected to the non-disengageable shaft and the drive motor for slow operation is connected to the disengageable shaft.

REFERENCES:
patent: 3511609 (1970-05-01), Kato
patent: 3865554 (1975-02-01), Wenckus

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