Mechanism for feedthrough of rotary motion to a sealed chamber

Details Mechanism for feedthrough of rotary motion to a sealed chamber Mechanism for feedthrough of rotary motion to a sealed chamber

1991-09-26

1993-09-14

Braun, Leslie A.

Machine element or mechanism

Flexible sealing diaphragm attached to moving rod and to casing

Longitudinally reciprocating rod

74570, F16J 1550, G05G 100

Patent

active

052438678

ABSTRACT:
A mechanism for feedthrough of rotary motion to a sealed chamber includes a shaft (220) rotatingly supported inside a hollow housing (200). The shaft (220) comprises a front portion (222), a middle portion (224), and a rear portion (226). The front portion (222) of the shaft protrudes into a sealed external vacuum chamber (202), which is attached to the housing (200). The rear portion (226) of the shaft (220) is eccentric with respect to the rotational axis of the shaft. A cylindrical end (244) of the shaft rotatingly supports a cap (252), which is coaxial with the shaft end (244). The housing (200) and the cap (252) are sealingly and movably connected by a bellows (246). A compensator (250), eccentric with respect to the cap (252) is rotatingly mounted at the periphery of the cap and is fitted into a cavity within an eccentric driver (248), the rotational axis of which is concentric with that of the shaft ( 220). The compensator (250) is rotatingly mounted inside a cylindrical cover (282), which is rigidly attached to the housing (200). Rotation of the driver (248) imparts planetary motion to the compensator (250), the cap (252), and the shaft end (244), which orbit the rotational axis of the shaft (220). Since the shaft end (244) is eccentric with respect to the rest of the shaft body, planetary motion of the shaft end translates into rotary motion of the shaft (220), which in turn rotates the sample inside the vacuum chamber (202).

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patent: 4797053 (1989-01-01), Balter
patent: 4885947 (1989-12-01), Balter et al.
patent: 4892010 (1990-01-01), Pottier et al.

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