Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
249 words
In a hydraulic device comprising a wall separating a high pressure area from a low pressure area, an opening in said wall which has a cylindrical surface, an annular groove provided in said surface, an axially movable rod traversing said opening, said rod and the cylindrical surface of said opening defining an annular space, a sealing arrangement positioned in said annular space between said rod and said surface, said sealing arrangement comprising a sealing ring consisting of a tough-elastic plastic material including harder elastomeric materials and a stressing ring consisting of a softer elastomeric material, the two rings being acommodated jointly in said groove in such a manner that one end of their common contact face points towards the high pressure area, the stressing ring being retained in sealing relationship between the circumferential face of said groove and the outer face of the sealing ring at an initial radial stress resulting from a certain oversize, and the sealing ring being provided, on its inner surface facing the rod, with two axially offset annular sealing edges being in sealing contact with the rod, wherein the said sealing ring comprises at least one channel connecting the annular space between the sealing edges with its outer surface and each opening defined by the end of said channel in the outer surface is covered by the said stressing ring and located between the highpressure end and the center of the common contact face of the said sealing ring and the said stressing ring.
Claim 2
Dependent Claim
249 words
In a hydraulic device comprising a wall separating a high pressure area from a low pressure area, an opening in said wall which has a cylindrical surface, an annular groove provided in said surface, an axially movable rod traversing said opening, said rod and the cylindrical surface of said opening defining an annular space, a sealing arrangement positioned in said annular space between said rod and said surface, said sealing arrangement comprising a sealing ring consisting of a tough-elastic plastic material including harder elastomeric materials and a stressing ring consisting of a softer elastomeric material, the two rings being acommodated jointly in said groove in such a manner that one end of their common contact face points towards the high pressure area, the stressing ring being retained in sealing relationship between the circumferential face of said groove and the outer face of the sealing ring at an initial radial stress resulting from a certain oversize, and the sealing ring being provided, on its inner surface facing the rod, with two axially offset annular sealing edges being in sealing contact with the rod, wherein the said sealing ring comprises at least one channel connecting the annular space between the sealing edges with its outer surface and each opening defined by the end of said channel in the outer surface is covered by the said stressing ring and located between the highpressure end and the center of the common contact face of the said sealing ring and the said stressing ring.
Claim 3
Dependent Claim
51 words
Arrangement according to claim 1, wherein the said sealing ring is provided with a plurality of channels and the outer face of the said sealing ring is provided with an annular groove into which the said channels open and which is covered by the said stressing ring over its full length.
Claim 4
Dependent Claim
65 words
Arrangement according to claim 2, wherein the said sealing ring consists of two partial rings comprising one sealing edge each, and the said channels are formed by grooves which, just as the annular groove connecting the channels, are recessed into that end face of one of the said two partial rings by which the same partial ring is in contact with the other partial ring.
Claim 5
Dependent Claim
57 words
Arrangement according to claim 2, wherein the said sealing consists of two partial rings comprising one sealing edge each, and the at least one channel is formed by a groove recessed into that end face of one of the said two partial rings by which the same partial ring is in contact with the other partial ring.
Claim 6
Dependent Claim
55 words
Arrangement according to any of the preceding claims, wherein the said sealing ring comprises an area arranged between the said stressing ring and the circumferential face of the said groove and forming, together with the area provided with the said sealing edges, a groove opening towards the high-pressure end and accommodating the said stressing ring.