Pipe joint for hydraulic pipe

A pipe joint for hydraulic pipe, comprising:

• an elbow body having a first end provided with a connecting portion to be connected to a pipe, and a second end provided with an external annular groove;
• a cylindrical adapter having a first end provided with a first externally threaded portion, and a second end provided with a second externally threaded portion to be screwed in an hydraulic apparatus;
• a substantially cylindrical nut having a first end provided with an internal projection capable of being movably fitted in said annular groove, and a second end provided with an internally threaded portion having threads capable of mating with said first externally threaded portion;
• the internally threaded portion of said nut and said first externally threaded portion of said adapter being engageable after fitting the internal projection of said nut in said annular groove to bring said elbow body into abutment against the adapter so as to be able to turn relative to the adapter;
• and
• an O-ring for installation between said elbow body and the adapter, said elbow body having a tapered O-ring squeezing surface, and the O-ring is squeezed between the elbow body and the adapter in an annular groove having a triangular cross section formed between said tapered O-ring squeezing surface of the elbow body and an O-ring squeezing surface of the adapter when the elbow body and the adapter are coupled completely.

A pipe joint for hydraulic pipe, comprising:

• an elbow body having a first end provided with a connecting portion to be connected to a pipe, and a second end provided with an externally threaded portion;
• a cylindrical adapter having a first end provided with an external annular groove, and a second end provided with an externally threaded portion to be screwed in an hydraulic apparatus;
• and
• a substantially cylindrical nut having a first end provided with an internal projection capable of being movably fitted in said annular groove, and a second end provided with an internally threaded portion having threads capable of mating with said externally threaded portion of said elbow body;
• wherein the internally threaded portion of said substantially cylindrical nut and the externally threaded portion of said elbow body are engaged after fitting the internal projection of said nut in the annular groove to bring the elbow body into abutment against the adapter so as to be able to turn relative to the adapter;
• and
• an O-ring for installation between said elbow body and the adapter, said elbow body having a tapered O-ring squeezing surface, and the O-ring is squeezed between the elbow body and the adapter in an annular groove having a triangular cross section formed between said tapered O-ring squeezing surface of the elbow body and an O-ring squeezing surface of the adapter when the elbow body and the adapter are coupled completely.

A pipe joint for hydraulic pipe, comprising:

• an elbow body having a first end provided with a connecting portion to be connected to a pipe, and a second end provided with an external annular groove;
• a cylindrical adapter having a first end provided with a first externally threaded portion, and a second end provided with a second externally threaded portion to be screwed in an hydraulic apparatus;
• a substantially cylindrical nut having a first end provided with an internal projection capable of being movably fitted in said annular groove, and a second end provided with an internally threaded portion having threads capable of mating with said first externally threaded portion;
• the internally threaded portion of said nut and said first externally threaded portion of said adapter being engageable after fitting the internal projection of said nut in said annular groove to bring said elbow body into abutment against the adapter so as to be able to turn relative to the adapter;
• and
• said adapter is provided in its outer circumference with an O-ring groove for receiving an O-ring for sealing the junction of the adapter and the hydraulic apparatus.

A pipe joint for hydraulic pipe, comprising:

• an elbow body having a first end provided with a connecting portion to be connected to a pipe, and a second end provided with an externally threaded portion;
• a cylindrical adapter having a first end provided with an external annular groove, and a second end provided with an externally threaded portion to be screwed in an hydraulic apparatus;
• and
• a substantially cylindrical nut having a first end provided with an internal projection capable of being movably fitted in said annular groove, and a second end provided with an internally threaded portion having threads capable of mating with said externally threaded portion of said elbow body;
• wherein the internally threaded portion of said substantially cylindrical nut and the externally threaded portion of said elbow body are engaged after fitting the internal projection of said nut in the annular groove to bring the elbow body into abutment against the adapter so as to be able to turn relative to the adapter;
• and
• said adapter is provided in its outer circumference with an O-ring groove for receiving an O-ring for sealing the junction of the adapter and the hydraulic apparatus.

A pipe joint structure for hydraulic pipe, comprising:

• an elbow body having a first end provided with a connecting portion to be connected to a pipe, and a second end provided with an externally threaded portion and an annular clearance groove;
• a part of an hydraulic apparatus provided with a connecting port provided successively in its inner circumference with an internally threaded portion and an annular clearance groove;
• the externally threaded portion of said elbow body and the internally threaded portion of said part of the hydraulic apparatus being constructed to drop respectively into the annular clearance grooves of the connecting port and the elbow body when the externally threaded portion of the elbow body is screwed completely into the connecting port of said hydraulic apparatus so that the elbow body is able to turn relative to the part of the hydraulic apparatus;
• and
• an O-ring for installation between said elbow body and the part of the hydraulic apparatus, said elbow body having a tapered O-ring squeezing surface, and said O-ring is squeezed between the elbow body and the part of the hydraulic apparatus in an annular groove having a triangular cross section formed between said tapered O-ring squeezing surface of said elbow body and a flat O-ring squeezing surface formed in the part of the hydraulic apparatus when the externally threaded portion of the elbow body is screwed completely into the part of the hydraulic apparatus.

A pipe joint structure for hydraulic pipe, comprising:

• an elbow body having a first end provided with a connecting portion to be connected to a pipe, and a second end provided with an externally threaded portion and an annular clearance groove;
• a part of an hydraulic apparatus provided with a connecting port provided successively in its inner circumference with an internally threaded portion and an annular clearance groove;
• the externally threaded portion of said elbow body and the internally threaded portion of said part of the hydraulic apparatus being constructed to drop respectively into the annular clearance grooves of the connecting port and the elbow body when the externally threaded portion of the elbow body is screwed completely into the connecting port of said hydraulic apparatus so that the elbow body is able to turn relative to the part of the hydraulic apparatus;
• and
• an O-ring for installation between said elbow body and the part of the hydraulic apparatus, said elbow body having a flat O-ring squeezing surface, and said O-ring is squeezed between the elbow body and the part of the hydraulic apparatus in an annular groove having a rectangular cross section formed between said flat O-ring squeezing surface of said elbow body and a flat O-ring squeezing surface formed in the part of the hydraulic apparatus when the externally threaded portion of the elbow body is screwed completely into the part of the hydraulic apparatus.