Locking device and a line fitting provided therewith
AssigneeJPB Systeme
InventorsJean Pierre Marc, Bernard Barre
Life of this patent
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Abstract
A locking device (1) is fixed to a nut (4) and includes a coupling unit (42) insertable into a hexagonal configuration (11) of a spigot end (2) at a reduced axial distance being coupled by mutually interpenetrable gears (49, 51) with a stop unit (38) which axially slides in a body (18) opposite to a compression spring (36). The gears (49, 51) are symmetric and are insertable into each other with a predetermined elastic resistance by the action of compression or loosing torque. The device is embodied in one piece which is mounted by assembling with the nut without affecting the spigot ends (2, 3).
Claims14
A screw coupling including a locking device, said screw coupling comprising first and second components rotatable in relation to one another during screwing and unscrewing, the first component comprising a first thread and a rotating engagement formation distant from the first thread, the locking device being mounted on the second component and comprising:
- a coupling component for coupling with the engagement formation,
- a stop component connected for common rotation with a body carried by the second component, the body connected for common rotation with the second component, and
- disconnectable coupling means between the coupling component and the stop component,
- wherein the disconnectable coupling means comprises a ratchet allowing relative rotation in the direction of unscrewing when a torque at least indirectly applied to the coupling component and the stop component with respect to one another overcomes a predetermined elastic resistance, the torque between the coupling component and the stop component resulting from a torque applied between the first component and the body.
A pipe coupling comprising a first pipe end-portion provided with an external thread, a second pipe end-portion, a nut which is rotatably mounted on the second pipe end-portion and can be screwed on the external thread of the first pipe end-portion, and a locking device for selectively locking against relative rotation the nut and the first pipe end-portion provided with the external thread, the locking device being mounted on the second pipe end-portion and comprising:
- a coupling component for coupling with an engagement formation formed on the first pipe end-portion distant from the external thread,
- a stop component for common rotation with a body carried by the nut, the body connected for common rotation with the nut, and
- disconnectable coupling means between the coupling component and the stop component,
- wherein the disconnectable coupling means comprises a ratchet allowing relative rotation in the direction of unscrewing when a torque at least indirectly applied to the coupling component and the stop component with respect to one another overcomes a predetermined elastic resistance, the torque between the coupling component and the stop component resulting from a torque applied between the first pipe end-portion and the body.
Dependencies are inferred from the claim text.