Shaft travel devices such as vertical lift arm devices

Details Shaft travel devices such as vertical lift arm devices Shaft travel devices such as vertical lift arm devices

1990-07-18

1992-11-03

Werner, Frank E.

Material or article handling

Elevator or hoist and loading or unloading means therefor

Comprising means enabling additional movement of carrier or...

414665, 414672, 4147443, 414749, 414785, 187 17, 92DIG1, 92118, 384226, 384556, 248913, 248469, 254 93R, B65G 700

Patent

active

051602385

ABSTRACT:
A shift travel device, exemplified by a vertical lift arm device, is described which provides for free rotation of its cylinder and arm about its shaft and free travel along the shaft without transfer of twist imposed by the arm and load to its shaft, constant sealing of operating air pressure within the cylinder during operation and load changes, and minimum friction during rotation when the cylinder and arm are in the extreme raised or lowered positions. The device includes unique self-aligning spherical bearings at the ends of the cylinder. The device is useful is a wide variety of environments, including those which are unusually dirty or clean.

REFERENCES:
patent: 2576660 (1951-11-01), Williams
patent: 2887092 (1959-05-01), Brady
patent: 3311030 (1967-03-01), Halstead
patent: 4978274 (1990-12-01), deGroot

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