The second stage cylinder is also configured in a rod and barrel arrangement, with the barrel of the first stage cylinder serving as the rod of the second stage cylinder.

On said bearing point, the rod of the jack comes out and lifts the seat in a high position.

The piston (A), which is connected to the rod of the double-acting cylinder (C), transmits the movements thereof to the piston of the latter.

The pulling rod of the cylinder is at its one end fixedly connected with a rotatable carrier casing (5) arranged on a sleeve (21), by means of a throughgoing bolt (22).

The pressure sensor provides an output signal related to the pressure of hydraulic fluid of the rod end of the double-acting cylinder, and the controller is connected to the pressure sensor.

Double Ended Hydraulic Cylinders will normally comprise of a single piston head mounted centrally on the hydraulic cylinder rod.

This force is responsible for moving the piston (the disc) in the desired direction, whether it is linear or rotary, by pushing the cylinder rod.

The hydraulic oil in arm cylinder rod end does not return the tank but goes directly to the cylinder head end.

This provided a mean towards secure stopping of the cylinder rod's retraction so that people will not have to worry about the closing of the storm door when they are moving large items, like furniture into or out from houses.

The reaction force of the cylinders to which hydraulic oil is supplied, the reaction force occurring during work involving the extension of the cylinders, increases the rod-side pressure of the boom cylinder (6) to decrease the head-side pressure.

When the cylinder rod tends to retract, the friction between the rod and the self-jamming part tends to move the self-jamming part in a direction to cause even more jamming.