초록 ▼

A stainless-steel fitting for resin tubes, which easily and securely connects resin tubes and is also inexpensive, is provided. Resin tube (9) is inserted into insert part (8), provided on fitting main body (1); nut (3) is screwed onto fitting main body (1) and sleeve (2) is moved; in the pipe fitti

A stainless-steel fitting for resin tubes, which easily and securely connects resin tubes and is also inexpensive, is provided. Resin tube (9) is inserted into insert part (8), provided on fitting main body (1); nut (3) is screwed onto fitting main body (1) and sleeve (2) is moved; in the pipe fitting which presses and locks resin tube (9) between insert part (8) and sleeve (2), a step part, composed of large diameter part (2a) and small diameter part (2b), is formed on the outer surface of the sleeve part (2); the length of small diameter part (2b) is that wherein the end-face of the small diameter part (2b) protrudes outward from nut (3), when sleeve (2) is inserted into nut (3); and nut (3) and sleeve (2) are integrated by pressing and spreading the inner diameter of this end-face.

대표청구항 ▼

1. A connection, comprising: a resin tube (9);a stainless-steel fitting main body (1) having an insert part (8);a sleeve (2); anda nut (3),wherein the insert part (8) has a male screw part (7) and a generally cylindrical shape with an outer surface having an outer diameter which is about the same as

1. A connection, comprising: a resin tube (9);a stainless-steel fitting main body (1) having an insert part (8);a sleeve (2); anda nut (3),wherein the insert part (8) has a male screw part (7) and a generally cylindrical shape with an outer surface having an outer diameter which is about the same as an inner diameter of the resin tube (9), the insert part (8) further having a protrusion part (8a) formed with a trapezoidal quarter section in a circumferential direction near the protrusion part's center, the protrusion part (8a) having an outer diameter which is larger than said outer surface, said insert part (8), said protrusion part (8a) and said fitting main body (1) being a single piece,the sleeve (2) having an inner surface having an inner diameter which is larger than an outer diameter of the resin tube (9),said insert part (8) being inserted into said resin tube (9) such that a surface of the protrusion part (8a) contacts the resin tube (9) such that the resin tube (9) is pressed between the protrusion part (8a) and the sleeve (2) and locked to the fitting main body (1),said nut (3) being screwed onto the fitting main body (1) and moving the sleeve (2), whereby the resin tube (9) is pressed and locked between the insert part (8) and sleeve (2),a step part, composed of a first diameter part (2a) and a second diameter part (2b) smaller than the first diameter part, being formed on an outer surface of the sleeve (2), the length of said second diameter part (2b) being such that an end-face of the second diameter part (2b) protrudes outward from said nut (3) when the sleeve (2) is inserted into the nut (3), the nut (3) and the sleeve (2) are integrated by pressing and spreading an inner diameter of said end-face, and the protrusion part (8a) and the first diameter part (2a) are opposing when in contact with a side-face of a wrench hooking part in the fitting main body. 2. The connection according to claim 1, wherein, when said sleeve (2) and nut (3) are integrated, the nut (3) is screwed onto the fitting main body (1), and a side-face of the nut (3) being such that the protrusion part (8a) in said insert part (8) and the first diameter part (2a) in the sleeve (2) are opposing, when in contact with a side-face of the wrench hooking part in the fitting main body (1). 3. The connection according to claim 1, wherein said nut (3) has a female screw part which screws into the male screw part (7) of the fitting main body (1) and the nut (3) has an inner diameter which is larger than the outer diameter of the second diameter part (2b) of the sleeve (2), and a pressing part (3a), which locks with a step part of the sleeve (2) and enables the sleeve (2) to move. 4. The connection according to claim 1, wherein the fitting body comprises a plurality of recesses at one side of the protrusion part (8a). 5. The connection according to claim 1, wherein the nut (3) is flared.