초록 ▼

To allow a telescoping cylinder that is ordinarily operated in a fixed sequence to also be operated in a simultaneous mode, the first stage (12) of the cylinder is provided with an end plate (126), the cylindrical gap (114) in the first stage communicates directly with the space (133) inside the sec

To allow a telescoping cylinder that is ordinarily operated in a fixed sequence to also be operated in a simultaneous mode, the first stage (12) of the cylinder is provided with an end plate (126), the cylindrical gap (114) in the first stage communicates directly with the space (133) inside the second stage (13) that is sealed off by the end plate, and a third cylindrical gap (124 & 124′), which is created in the second stage out of the sections (124 & 124′) that are sealed off (1331) and derive from the end plate in the first stage, is provided with a pressure-medium line (23) that communicates through a telescoping passage (1131 & 1232) between the floor (111) of the cylinder (110 and the end plate (126) in the first stage, specifically satisfying the demand that the cylindrical gap (114) in the first stage (12) and the space (133) inside the first stage are equal in volume.

대표청구항 ▼

A two-stage telescoping hydraulic cylinder with two telescoping pistons, one of said pistons sliding back and forth inside the other piston, said telescoping pistons having cylindrical gaps therebetween; said cylinder having a pressure space; a first pressure-medium line communicating with said pres

A two-stage telescoping hydraulic cylinder with two telescoping pistons, one of said pistons sliding back and forth inside the other piston, said telescoping pistons having cylindrical gaps therebetween; said cylinder having a pressure space; a first pressure-medium line communicating with said pressure space; said cylinder having a first stage and a second stage; a second pressure-medium line communicating with a cylindrical gap in said first stage above the bottom of said first stage; said first stage having a pressure space therein; said second stage having a pressure space therein; means for constant communication between said pressure space of said cylinder and said pressure space in said first state; means for constant communication between said pressure space of said first stage and said space in said second stage; an end plate on said first stage and defining said space in said second stage; said first stage and said second piston forming said cylindrical gap of said second stage, said cylindrical gap having communicating sections; telescoping passage means extending through the bottom of said first stage and the bottom of said second stage to the end plate of the first stage, said cylindrical gap of said second stage communicating with a third pressure-medium line through the bottom of said cylinder and said telescoping passage means; said cylindrical gap of said first stage and said space in said second stage having equal volumes; said pressure space of said second stage and the cylindrical gap of said second stage having substantially equal surface areas.