Telescopic cylinder construction

A telescopic fluid pressure cylinder, comprising:

• (a) a hollow cylindrical base member of substantially uniform wall thickness throughout its length arranged to be mounted for support,
• (b) the base member having an end closure at one end,
• (c) the base member having a fluid pressure passageway for introducing fluid under pressure into the interior of said base member,
• (d) the base member having near its open end a set of longitudinally spaced machined grooves on its interior surface removably mounting a ring set including a stop ring, a seal ring outwardly of the stop ring and a bearing ring outwardly of the seal ring,
• (e) at least one telescoping cylinder stage slidably received through said ring set in the base member,
• (f) each telescoping cylinder stage being of substantially uniform wall thickness throughout its length and having a set of internal machined grooves near its outer end removably moving a ring set including a stop ring, a seal ring outwardly of the stop ring and a bearing ring outwardly of the seal ring, each cylinder stage also having near its opposite end an internal machined groove removably receiving a lifting ring and an external machined groove removably receiving a guide bearing ring arranged for abutment at its inner end with the lifting ring of the adjacent outer cylinder stage, and at its outer end with the stop ring of the same adjacent outer cylinder stage, and
• (g) a piston slidably received through the rings in the innermost cylinder stage and having an external machined groove near its inner end removably receiving a guide bearing ring arranged for abutment at its inner end with the lifting ring of the adjacent telescoping cylinder stage.