Mechanism for feedthrough of rotary and/or linear motions to a s

Machine element or mechanism – Flexible sealing diaphragm attached to moving rod and to casing – Pivoting or nutating rod

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74 63, F16J 1550

Patent

active

048859460

ABSTRACT:
A rotary motion feedthrough mechanism for an external sealed chamber (206) located outside the mechanism through an inner sealed chamber formed inside the mechanism comprises a first driven shaft (220) with a through opening and a second driven shaft (234) moveably inserted into the through opening of the first shaft. The first shaft (220) carries an eccentric sleeve (242) which is rigidly attached thereto and rotatingly supports on bearings (246 and 248) a cylindrical bushing (244). The bushing (244) in turn supports a cylindrical body (250) which is supported on the bushing by bearings (251 and 253). Cylindrical body (250) is driven into rotation from an external drive means, e.g., manually from a handwheel (266) via a pinion (260) and a gear wheel (256) which is attached to the cylindrical body. Because of eccentricity of the bushing with respect to the axis of rotation of the first shaft (220), the bushing will describe planetary motions with respect to the above-mentioned axis of rotation. The second driven shaft (234) is driven into rotation from an independent rotary feedthrough device (240). For sealing the external sealed chamber (206), both driven shafts are surrounded by the above-mentioned inner sealed chamber which is formed partially by the above-mentioned bushing (244) and stationary sleeve (228), and partially by bellows (268 and 270). Provision of the bellows allows the bushing to describe planetary motions without violating hermetic sealing of the system. For maintaining vacuum conditions, the mechanism is connected to the external vacuum chamber and to the drive unit of the second shaft via appropriate seal rings. In the second embodiment, the rotary motion feedthrough mechanism (240) is replaced by a linear motion feedthrough drive unit (282). In a third embodiment, the second shaft is substituted by a tube (286) and is used for the supply of fluid, e.g., liquid nitrogen from an externally installed fluid feedthrough device (290).

REFERENCES:
patent: 1277193 (1918-08-01), Cassel
patent: 4403521 (1983-09-01), f'Geppert
patent: 4683963 (1987-08-01), Balter

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