Method and apparatus for rotary motion transfer into an isolated

Details Method and apparatus for rotary motion transfer into an isolated Method and apparatus for rotary motion transfer into an isolated

1998-08-03

2000-09-19

Bucci, David A.

Machine element or mechanism

Flexible sealing diaphragm attached to moving rod and to casing

Pivoting or nutating rod

464 88, F16J 1550

Patent

active

061195375

ABSTRACT:
An apparatus is provided for transferring rotary motion into an isolated region. The apparatus includes first and second angled drive shafts each coupled to an opposite side of a collar via one or more bearings. A flexible seal is coupled between the collar and an isolated region (e.g., a process chamber) forming a first stage isolation region. The second shaft extends from the collar through the first stage isolation region into the process chamber. The first shaft extends through an end plate to the collar. An anti-rotation element is coupled between the collar and the end plate. As the first angled shaft rotates the collar wobbles causing the second shaft to rotate within the process chamber. Rotational forces which may be imparted from the shaft to the collar are opposed by friction induced between the collar and the end plate by the anti-rotation element. Thus, the collar will not rotate and the flexible seal will not twist. Accordingly the flexible seal may be made of an inexpensive material as it functions merely for isolation, and need not be configured to obstruct the collar's rotation.

REFERENCES:
patent: 3720076 (1973-03-01), Nordin
patent: 4550630 (1985-11-01), Remus
patent: 4683763 (1987-08-01), Balter
patent: 4885946 (1989-12-01), Balter
patent: 5113102 (1992-05-01), Gilmore
IBS Magnet data sheet titled "Dauermagnet-Stirndrehkupplung".

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