US 7,980,598 B2Granted

Pipe joint locking device

AssigneeFujikin Incorporated

InventorsKenji Tsubota, Michio Yamaji

Life of this patent

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Abstract

A pipe joint locking device which prevents accidental loosening of a pipe joint after tightening and with which a sealing property of a seal portion of the pipe joint is not impaired even if a force for rotating a pipe member acts on the pipe member. The device is formed of: a first component member 11 including a mounting portion 21 to be mounted to a joint member 2 having an external thread while prevented from relative rotation, a cover portion 22 to be brought into contact with an outer peripheral face of a cap nut 5 from a lower side, and a coupling portion 23 to be brought into contact with a pipe member 3 from the lower side; and a second component member 12 including a cover portion 31 to be brought into contact with the outer peripheral face of the cap nut 5 from an upper side and a coupling portion 32 to be brought into contact with the pipe member 3 from the upper side. The coupling portion 23 of the first component member 11 and the coupling portion 32 of the second component member 12 are coupled to be fixed to a portion 3a of the pipe member 3 protruding from the cap nut 5.

Claims4

Dependent claims

A pipe joint locking device preventing accidental loosening of a pipe joint after tightening, the pipe joint connected by tightening a joint member having an internal thread over a joint member having an external thread in a state in which the joint member having the external thread and a pipe member face each other via a seal portion,

wherein the device comprises:
a first component member including a mounting portion mounted to the joint member having the external thread while being prevented from relative rotation, a cover portion provided to be contiguous with the mounting portion and brought into contact with an outer peripheral face of the joint member having the internal thread from one side, and a coupling portion provided to be contiguous with the cover portion and brought into contact from the one side with a round portion of the pipe member protruding from the member having the internal thread;
and
a second component member including a cover portion brought into contact with the outer peripheral face of the joint member having the internal thread from the other side and a coupling portion provided to be contiguous with the cover portion and brought into contact from the other side with the portion of the pipe member protruding from the joint member having the internal thread, and
the coupling portion of the first component member and the coupling portion of the second component member are coupled and fixed to the round portion of the pipe member protruding from the joint member having the internal thread, and
relative rotation of the pipe member with respect to the joint member having the external thread is prevented even if a rotational force acts on the pipe member.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/085,578Filed 11 Oct 2006
Priority: JP 2005-3528837 Dec 2005
Published: US 2009/0302598 A110 Dec 2009
Granted: 19 Jul 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

F16L 19/005
Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on, or into, one of the joint parts:…
F16L 19/0286
The collars or flanges being obtained by deformation of the pipe wall: and being formed as a flange
F16L 19/046
With additional sealing means: consisting of a soft ring
F16L 27/0832
With ball or roller bearings: having axial bearings