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US 4,066,279 AGranted
Pneumatic spring of adjustable length
AssigneeStabilus GmbH
InventorPanoyotis Kaptanis
Life of this patent
Estimating the term…
Abstract
The piston rod of a pneumatic spring is expelled from the cylinder by compressed fluid in the cylinder until a normally open channel connecting two compartments of the cylinder cavity on opposite axial sides of the piston is blocked by cooperating valve elements on the cylinder and on the piston assembly.
Claims10
A pneumatic spring comprising:
- a. a cylinder having an axis and bounding a sealed cavity therein;
- b. a piston assembly including
- 1. a piston portion movable in said cavity between two axially terminal positions and separating two compartments of said cavity, and
- 2. an axially elongated piston rod portion having one axially terminal part fastened to said piston portion in said cavity and another axially terminal part outside said cavity, said piston rod portion movably passing through said cylinder;
- c. a body of fluid in said cavity under a pressure higher than atmospheric pressure and permanently biasing said piston rod portion outward of said cavity;
- d. conduit means bounding a channel connecting said compartments for flow of said fluid between said compartments;
- and
- e. cooperating valve means on said cylinder and on said piston assembly responsive to movement of said piston portion into a position spacedly intermediate said terminal positions for closing said channel and for thereby sealing said compartments from each other, and responsive to movement of said piston portion from said intermediate position toward either terminal position thereof for opening said channel.
5 more elements
A pneumatic spring comprising:
- a. a cylinder having an axis and bounding a cavity therein;
- b. a piston assembly including
- 1. a piston portion axially movable in said cavity between two terminal positions and axially separating two compartments of said cavity, and
- 2. an axially elongated piston rod portion having one axially terminal part fastened to said piston portion in said cavity and another axially terminal part outside said cavity, said piston rod portion movably passing through said cylinder, said terminal positions of said piston portion being adjacent and remote from said other axially terminal part of said piston rod portion respectively;
- c. a fluid sealed in said compartments, the pressure of said fluid being higher than atmospheric pressure in all axial positions of said piston portion, whereby said fluid permanently biases said piston rod portion outward of said cavity;
- d. conduit means bounding a channel connecting said compartments for flow of said fluid between said compartments;
- and
- e. cooperating valve means on said cylinder and on said piston assembly responsive to movement of said piston portion into a position spacedly intermediate said terminal positions for closing said channel and for thereby sealing said compartments from each other, and responsive to movement of said piston portion from said intermediate position toward said remote terminal position thereof for opening said channel.
5 more elements
Dependencies are inferred from the claim text.