Piston-cylinder assembly with braking device

Details Piston-cylinder assembly with braking device Piston-cylinder assembly with braking device

Filed on

2005-11-01

Date issued

2005-11-01

Examiner

Siconolfi, Robert A. (Department: 3683)

Patent Class

Brakes

SubClass

Internal-resistance motion retarder

SubSubClass

Valve structure or location

Other Related Categories

C188S282500, C188S319100

Type

Reexamination Certificate

Status

active

Patent number

06959797

Description

ABSTRACT:
In a piston-cylinder assembly comprising a cylinder in which a piston rod is installed with freedom of axial movement and which is filled with a blocking medium, a braking device becomes active when the piston-cylinder assembly moves faster than a defined speed and thus limits the speed to a desired extent. A valve body divides the cylinder into two working spaces, which are connected to each other by at least one flow-through opening. As soon as the defined speed is exceeded, the dynamic pressure in the working space elastically deforms a disk, which has the effect of at least partially sealing off the flow-through opening(s) in opposition to the forces trying to keep them open. The elastic deformation of the disk represents a closing movement relative to the cross section of the flow-through opening(s). The disk takes the form of a valve ring, which is installed in a valve ring groove with a certain freedom of axial movement. The valve ring moves toward one or the other side wall of the groove depending on the direction of movement and thus at least partially seals off the minimum of one flow-through opening as a result of the dynamic pressure-induced deformation of the valve ring.

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English Abstract of DE-19846373.

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