Back to results
US 12,571,491 B2Granted
Pipe joint
AssigneesHigashio Mech Co., Ltd., Daikin Industries, Ltd.
InventorAkio Yasuda
Life of this patent
Estimating the term…
Abstract
The pipe joint includes a flare joint body 1F, a cap nut 2, and a stop ring 3. A curved pressure-contacting slope surface 32 of the stop ring 3 contacts a slope surface 5 with reduced-diameter tip of the flare joint body 1F under pressure to establish sealing by means of mutual contact between metallic surfaces. The pipe P is grasped in a tightly pressure-contacting state using a back tooth and a front tooth formed at a tip head 37 of a substantially cylindrical thin part 35 of the stop ring 3.
Claims7
A pipe joint comprising a joint body (1) and a cap nut (2),
- wherein the joint body (1) comprises a connection tube (7) having a male screw part (9) at an outer peripheral surface of the connection tube (7) and a substantially cylindrical part (35) being thinner than the connection tube (7) and continuously formed toward a tip of the joint body (1) from the connection tube (7), and the substantially cylindrical part (35) includes an extraction preventing tooth part (36) as an integral part that comes into a pressure-contacting state of contacting an outer peripheral surface (10A) of a connection target pipe (P) to generate pipe extraction resistance (Z) in response to threaded movement of the cap nut (2) toward the joint body (1), and
- wherein the cap nut (2) includes:
- a female screw part (12) threadedly attached to the male screw part (9) and provided at a base end of a hole part (11);
- and a stepped section (15) and a tapered section (17) with reduced-diameter tip provided at an intermediate area of the hole part (11), and
- the tapered section (17) with reduced-diameter tip is defined by a base-end tapered part (17A) and a tip tapered part (17B), and the base-end tapered part (17A) and the tip tapered part (17B) are configured to contact a tip head (37) of the substantially cylindrical part (35) to move the substantially cylindrical part (35) radially inwardly,
- the base-end tapered part (17A) and the tip tapered part (17B) are continuously formed in an axial direction of the cap nut (2), and a slope of the base-end tapered part (17A) is steeper than a slope of the tip tapered part (17B).
3 more elements
A pipe joint comprising a joint body (1) and a cap nut (2),
- wherein the joint body (1) comprises a connection tube (7) having a male screw part (9) at an outer peripheral surface of the connection tube (7) and a substantially cylindrical part (35) being thinner than the connection tube (7) and continuously formed toward a tip of the joint body (1) from the connection tube (7), and the substantially cylindrical part (35) includes an extraction preventing tooth part (36) as an integral part that comes into a pressure-contacting state of contacting an outer peripheral surface (10A) of a connection target pipe (P) to generate pipe extraction resistance (Z) in response to threaded movement of the cap nut (2) toward the joint body (1), wherein
- the cap nut (2) includes:
- a female screw part (12) threadedly attached to the male screw part (9) and provided at a base end of a hole part (11);
- and a stepped section (15) and a tapered section (17) with reduced-diameter tip provided at an intermediate area of the hole part (11),
- the tapered section (17) with reduced-diameter tip is defined by a base-end tapered part (17A) and a tip tapered part (17B), and the base-end tapered part (17A) and the tip tapered part (17B) are configured to contact a tip head (37) of the substantially cylindrical part (35) to move the substantially cylindrical part (35) radially inwardly,
- the base-end tapered part (17A) and the tip tapered part (17B) are continuously formed in an axial direction of the cap nut (2), and a slope of the base-end tapered part (17A) is steeper than a slope of the tip tapered part (17B),
- the extraction preventing tooth part (36) includes a back tooth (36B) and a front tooth (36F) arranged at a tiny interval (W36), the back tooth (36B) has a trapezoidal or substantially trapezoidal sectional shape with a linear first tip side (41) as an upper side, the front tooth (36F) has a trapezoidal or substantially trapezoidal sectional shape with a linear second tip side (42) as an upper side, and as the cap nut (2) threadedly moves forward, the first tip side (41) of the back tooth (36B) and the second tip side (42) of the front tooth (36F) of the joint body (1) come into a pressure-contacting state of contacting the outer peripheral surface (10A) of the connection target pipe (P) to generate pipe extraction resistance (Z).
4 more elements
Dependencies are inferred from the claim text.