Snubber for one end lift jacks

Details Snubber for one end lift jacks Snubber for one end lift jacks

1975-11-24

1977-03-29

Smith, Al Lawrence

Implements or apparatus for applying pushing or pulling force

Hoisting truck

Platform type

254 93R, B66F 324

Patent

active

040145158

ABSTRACT:
A one end lift or like jack is provided with a snubber which prevents a lift saddle from rising in an uncontrolled manner. The snubber comprises a bi-ended cylinder closed at both ends which is affixed to the lift cylinder for corresponding vertical motion. A piston rod is affixed to a relatively stationary lift frame, and a piston is mounted to the rod within the snubber cylinder to define two cylinder chambers. Within the piston is an axial bleed port bore permitting fluid to bleed between the chambers. A check ring can be moved by fluid pressure imbalance along the snubber piston rod into a closed position against the bleed port, inhibiting fluid flow and prohibiting uncontrolled rise of the snubber and main cylinders. When the check ring is not in its closed position, relatively free lift lowering action is permitted.

REFERENCES:
patent: 2645485 (1955-07-01), Mead
patent: 2679827 (1954-06-01), Perdue
patent: 2973184 (1961-02-01), Trautman et al.
patent: 3081743 (1963-03-01), Bishop et al.
patent: 3158208 (1964-11-01), Kammerer
patent: 3315571 (1967-04-01), Mott et al.
patent: 3929057 (1975-12-01), Kondo

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