초록 ▼

A tubular fitting is threaded at one end for connection to a valve, meter, or the like and at the opposite end to a compression nut. A bore extends through the fitting and includes a tapered or restricted portion. The tapered portion forms an internal shoulder. A compressible sleeve is positioned in

A tubular fitting is threaded at one end for connection to a valve, meter, or the like and at the opposite end to a compression nut. A bore extends through the fitting and includes a tapered or restricted portion. The tapered portion forms an internal shoulder. A compressible sleeve is positioned in the fitting bore opposite the internal shoulder. A reinforcing insert extends through the sleeve. The insert abuts the end of the sleeve. An annular space is provided between the sleeve and the insert for receiving an unthreaded conduit. The insert includes a plurality of annular serrations adapted to frictionally engage the end of the conduit positioned in the annular space. The application of a force on the conduit in a direction to pull the conduit out of the fitting advances the sleeve against the fitting internal shoulder. The sleeve is compressed onto the flexible conduit to increase the frictional engagement of the conduit with the insert serrations. As the pullout force on the conduit increases, the insert pushes axially against the sleeve to increase the compression of the sleeve against the fitting internal shoulder. Thus the frictional engagement of the conduit to the insert is increased to prevent pullout of the conduit from the fitting.

대표청구항 ▼

A compression-type coupling for connection to a conduit comprising, a fitting having a body portion with a bore extending therethrough, said fitting body portion having a first tapered portion and a second tapered portion spaced axially from said first tapered portion, said first tapered portion for

A compression-type coupling for connection to a conduit comprising, a fitting having a body portion with a bore extending therethrough, said fitting body portion having a first tapered portion and a second tapered portion spaced axially from said first tapered portion, said first tapered portion forming an internal shoulder of said body portion surrounding said bore and said second tapered portion forming a restraining means, a sleeve positioned in said fitting bore, said sleeve including a body portion having a first end portion and a second end portion, said sleeve having a bore adapted to receive the conduit, a reinforcing insert positioned in said sleeve, said reinforcing insert and said sleeve positioned together as a unit in said fitting bore, said reinforcing insert including a tubular body portion having a diameter to facilitate insertion of said reinforcing insert in the conduit, said reinforcing insert including first and second end portions and a passageway extending therethrough, said reinforcing insert forming an annular space between said reinforcing insert and said sleeve, abutment means positioned on said reinforcing insert first end portion for engaging said insert to said sleeve first end portion, said sleeve including an internal shoulder positioned in surrounding relation with said insert first end portion so that said abutment means extends into said sleeve body portion to securely engage said insert to said sleeve, said sleeve internal shoulder forming a stop for receiving the conduit extending into said annular space between said sleeve and said reinforcing insert, said sleeve second end portion being positioned adjacent said fitting internal shoulder, said reinforcing insert and said sleeve being restrained for limited axial movement within said fitting between said fitting internal shoulder and said fitting restraining means upon movement of the conduit into said annular space between said sleeve and said reinforcing insert, gripping means extending between said reinforcing insert tubular body portion and the conduit positioned in said annular space for frictionally engaging the conduit to said reinforcing insert, said sleeve second end portion being urged against said fitting shoulder by the force of said reinforcing insert first end portion applied to said sleeve internal shoulder when a pullout force is applied to the conduit in a direction tending to pull the conduit out of said fitting, and said fitting internal shoulder applying upon said sleeve a compressive force which is transmitted through said sleeve body portion and said sleeve internal shoulder to the conduit to urge the conduit into increased frictional engagement with said insert to retain said insert in said fitting and prevent pullout of the conduit from said fitting.