Driving device having sealing mechanism

Details Driving device having sealing mechanism Driving device having sealing mechanism

1992-08-26

1993-09-28

Olszewski, Robert P.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187 292, B66B 1104

Patent

active

052480224

ABSTRACT:
A driving device comprises a first cover, a second cover telescopically engaging with the first cover, and a third cover surrounding the first and second covers. Part of a driving member for moving the second cover in relation to the first cover is arranged in a first space defined in the first cover. The first space is supplied with nitrogen, and pressure in the space is kept at a positive value. Gas is fed into and exhausted from a second space defined between the first and second covers, in accordance with a change in the volume thereof, whereby pressure in the second space is kept at a substantially constant value. Gas contained in a third space defined between the third cover and the first and second covers is exhausted, and pressure in the third space is kept at a negative value. Thus, the first space is completely isolated from a space around the driving device.

REFERENCES:
patent: 3715014 (1973-02-01), Ohta
patent: 4043428 (1977-08-01), White et al.

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