Machine element or mechanism – Flexible sealing diaphragm attached to moving rod and to casing – Pivoting or nutating rod
Patent
1988-12-19
1989-12-12
Falk, Joseph
Machine element or mechanism
Flexible sealing diaphragm attached to moving rod and to casing
Pivoting or nutating rod
74 63, F16J 1550
Patent
active
048859478
ABSTRACT:
A rotary motion feedthrough mechanism for a sealed chamber comprises a first driven shaft (56) with a through opening (66) and a second driven shaft (96) moveably inserted into the through opening of the first shaft. At its rear end the first driven shaft has a recess (102) which is eccentric and inclined with respect to the axis of rotation of both shafts. The recess rotatingly supports one end of a conical sleeve (110), the other end of which is rotatingly supported in an inclined opening of an external sleeve (68) which is connected to a rotary drive unit through a sprocket (76) installed on the outer surface of the external sleeve. The end of the second drive shaft opposite to the eccentric opening of the first shaft is connected to an independent rotary motion feedthrough mechanism which is capable of transmitting rotation into a sealed space. When the mechanism is sealingly connected, e.g., to a vacuum chamber (46), it can transmit two independent rotations from outside of the chamber (46) to the first and second driven shafts. The first driven shaft (56) is rotated from the rotary drive unit, via the sprocket (76), and the external sleeve (68). Since the rear end of the conical sleeve is inclined, rotation of the external sleeve will cause orbital motions of the conical sleeve (110). The front end of the conical sleeve is installed in the eccentric recess (102) of the first driven shaft (56). Therefore, the latter will be driven into rotation. At the same time, the second shaft (96) is rotated from its independently installed rotary motion feedthrough mechanisms. In the second embodiment, the rotary motion feedthrough mechanism (94) is replaced by a linear motion feedthrough drive unit (138) and the second shaft (132) is moved axially within the first driven shaft (56). In a third embodiment, the second shaft is substituted by a tube (142) and is used for the supply of fluid, e.g., liquid nitrogen from an externally installed fluid feedthrough device (148).
REFERENCES:
patent: 1277193 (1918-08-01), Cassel
patent: 4403521 (1983-09-01), f'Geppert
patent: 4683763 (1987-08-01), Balter
Balter Valentin
Hooper Gerald H.
Falk Joseph
Huntington Mechanical Laboratories, Inc.
Pressman David
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