Arrangement in connecting fittings for pressure conduits

Claim 2

Connecting fitting for pressure medium conduits comprising a pair of coupling elements which can be coupled together with low resistance when introduced to each other and having corresponding bores therethrough, one of said elements having a male portion with a cylindrical outer surface, the other of said elements having a female portion with a second bore defined by a wall whose inner diameter substantially corresponds to the outer diameter of said surface of said male portion, said female portion having a shoulder at the inner end of said second bore, said male portion having a free top end and an elongated oblique surface extending from said free top end to a shoulder in said outer surface of said male portion, said female portion having a first annular notch in said second bore wall positioned for facing said obliquesurface in the assembled position of said male and female portions, a first ring seal positioned in said first annular notch, said first ring seal being of a configuration and having a position for spacing apart said female portion shoulders from said male portion free top end in the connected position of said male and female portions, a second ring seal, said female portion having a second annular notch having said second ring seal displacably mounted therein and positioned for facing said male portion cylindrical outer surface in the connected position of said male and female portions, said second notch having a distinctively greater height than said second seal for permitting the displacement of said second seal therein during connection of said female and male portions and said second sealing ring being mounted in said second notch for being displaceable in an uncompressed condition toward the inner wall of said second notch by means of the male portion in an initial stage of said connection and for being displaceable by a medium cushion trapped between said first and second seals in an end stage of the connection and thereby allow said medium cushion to be absorbed in said second notch in front of said second seal.

Claim 3

Connecting fitting for pressure medium conduits comprising a pair of coupling elements which can be coupled together with low resistance when being introduced to each other and having corresponding bores therethrough, one of said elements having a male portion with a cylindrical outer surface, the other of said elements having a female portion with a second bore defined by a wall whose inner diamter substantially corresponds to the outer diameter of said surface of said male portion, said female portion having a shoulder at the inner end of said second bore, said male portion having a free top end and an elongated oblique surface extending from said free top end to a shoulder in said outer surface of said male portion, said female portion having an annular notch in said second bore wall positioned for facing said oblique surface in the assembled position of said male and female portions and which annular notch is defined by a front wall on said female portion shouler, a bottom wall and a rear wall, a ring seal being positioned in said annular notch and having a pair of elongated lips and an annular groove between said lips, one of said ring seal lips being positioned and has a configuration for tightly engaging the front and bottom walls of said annular notch, the other of said ring seal lips being positioned and having a configuration for being engageable only mainly with said male portion oblique surface in an end stage of the connecting procedure and for tightly engaging the major part of said male portions oblique surface in the connected position of said male and female portions and for inclining from its base over the male portion shoulder and the lap between the male and female portions, said ring seal being of a configuration for spacing apart said female portion shoulder from said male portion free top end in the connected position of said male and female portions and said ring seal annular groove having its mouth facing said female portion shoulder for receiving fluid from said coupling elements bores when in use whereby said fluid presses said first lip against all the notch walls and said second lip against said oblique surface and said shoulder of the male portion.

Claim 4

Connecting fitting for pressure medium conduits comprising a pair of coupling elements which can be coupled together with low resistance when being introduced to each other and having corresponding bores therethrough, one of said elements having a male portion with a cylindrical outer surface, the other of said elements having a female portion with a second bore defined by a wall whose inner diamter substantially corresponds to the outer diameter of said surface of said male portion, said female portion having a shoulder at the inner end of said second bore, said male portion having a free top end and an elongated oblique surface extending from said free top end to a shoulder in said outer surface of said male portion, said female portion having an annular notch in said second bore wall positioned for facing said oblique surface in the assembled position of said male and female portions and which annular notch is defined by a front wall on said female portion shouler, a bottom wall and a rear wall, a ring seal being positioned in said annular notch and having a pair of elongated lips and an annular groove between said lips, one of said ring seal lips being positioned and has a configuration for tightly engaging the front and bottom walls of said annular notch, the other of said ring seal lips being positioned and having a configuration for being engageable only mainly with said male portion oblique surface in an end stage of the connecting procedure and for tightly engaging the major part of said male portions oblique surface in the connected position of said male and female portions and for inclining from its base over the male portion shoulder and the lap between the male and female portions, said ring seal being of a configuration for spacing apart said female portion shoulder from said male portion free top end in the connected position of said male and female portions and said ring seal annular groove having its mouth facing said female portion shoulder for receiving fluid from said coupling elements bores when in use whereby said fluid presses said first lip against all the notch walls and said second lip against said oblique surface and said shoulder of the male portion.

Claim 5

Connecting fitting as claimed in claim 2 including a ring shaped spring seated in said ring seal annular groove with the bias of said spring being directed radially towards said second lip.

Claim 6

Connecting fitting as claimed in claim 2 including a second ring seal, said female portion having a second annular notch having said second ring seal slideably mounted therein and positioned for facing said male portion cylindrical outer surface in the connected position of said male and female portions and said second notch having a greater height than said second seal for permitting the sliding of said second seal therein during connection of said female and male portions.

Claim 7

Connecting fitting as claimed in claim 4 wherein said female portion has a chamfer connecting said second annular notch with said female portion second bore wall.