초록 ▼

A hydraulic cylinder provided in its piston with axial channels with check valves permitting fluid flow in one direction from one cylinder chamber to the other. Constricting means in the form of a spring-biased plate displaceably mounted on the piston rod covers, after a certain displacement of the

A hydraulic cylinder provided in its piston with axial channels with check valves permitting fluid flow in one direction from one cylinder chamber to the other. Constricting means in the form of a spring-biased plate displaceably mounted on the piston rod covers, after a certain displacement of the piston, a portion of the outlet openings of the axial channels to reduce the flow-through cross-sectional area and brake the piston movement.

대표청구항 ▼

In a hydraulic piston-cylinder device, comprising a cylinder, a piston which is displaceable in the cylinder and which divides the interior of the cylinder into two cylinder chambers, and a piston rod joined to the piston and extending out through an opening in one cylinder end wall, said piston hav

In a hydraulic piston-cylinder device, comprising a cylinder, a piston which is displaceable in the cylinder and which divides the interior of the cylinder into two cylinder chambers, and a piston rod joined to the piston and extending out through an opening in one cylinder end wall, said piston having at least one axial through-passage with check valve means permitting fluid flow in only one direction through the piston from one cylinder chamber to the other and preventing fluid flow from said other cylinder chamber to said one cylinder chamber; the improvement comprising means (8, 9) for connecting the cylinder in a hydraulic circuit to drain fluid from said one cylinder chamber (10) and to supply fluid to said other cylinder chamber (10), and constricting means (20) cooperating with the piston (12) and arranged, after a certain piston movement in the direction resulting in fluid flow from said one cylinder chamber (11) to said other (10) via the check valve means (14), to reduce the flow-through area of the axial passage (13) to brake continued piston movement.