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US 4,015,835 AGranted
Shock absorbers for elevators
AssigneeR. Stahl Aufzuege GmbH
InventorsGunter Schumacher, Peter Tef, Max Wiester
Life of this patent
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Abstract
A shock absorber for use in elevators comprising a hollow piston rod connected to a piston which is movable within a cylinder filled with a fluid and having apertures in the cylinder wall for communication with a surrounding cylindrical expansion chamber and means for providing fluid communication with the interior of said piston rod. The hollow piston is forced into the cylinder during operation of the shock absorber thereby forcing fluid into both the cylindrical expansion chamber and the interior of the piston rod.
Claims14
A hydraulic shock absorber comprising:
- a vertically oriented cylinder,
- a hollow piston rod mounted concentrically with said cylinder,
- a piston connected to the lower end of said piston rod,
- said piston adapted for vertical movement within said cylinder and slidably movable against the walls of said cylinder,
- a cylindrical expansion chamber substantially surrounding said cylinder, said cylinder having apertures therethrough for passage of fluid from the interior of said cylinder to said cylindrical expansion chamber,
- means for providing fluid communication between said cylindrical expansion chamber and the hollow interior of said piston rod,
- whereby fluid from the interior of said cylinder passes into said expansion chamber and said piston rod upon the downward movement of said piston and said piston rod into said cylinder, and
- wherein said piston rod contains a dip stick for measuring the fluid level.
5 more elements
Dependencies are inferred from the claim text.