Telescopic cylinders provide a long stroke from a very compact retracted length. LHS has experience designing pneumatic and hydraulic telescopic for a number of industries and applications and can work with you to design a single acting, a single acting/double acting combination, or a double acting design.
SINGLE ACTING Telescopic cylinders are the simplest telescopic design. A single acting cylinder is extended using hydraulic pressure but is retracted using external forces (usually gravity), once the hydraulic pressure is removed
SINGLE/DOUBLE COMBINATION Telescopic cylinders are a single acting telescopic cylinder where one or more of the smaller stages are double acting. A typical application is a mast raising design on a drilling rig where the load must be pulled over centre until gravity can take over to retract the cylinder.
DOUBLE ACTING Telescopic cylinder designs are extended and retracted using hydraulic pressure. A double acting Telescopic cylinder is a more complex design and involves additional sealing within the internal body of the cylinder to seal off the different stages. Passageways are machined into the internal components of the cylinder to allow for proper staging. This type of design is usually utilized when gravity is not available to retract the cylinder