Load security device including a coupling part with snap action

1. A lashing device, comprising:

a stretching device, to be fastened between two fixing points to be secured to one another, the stretching device including stretching device parts, each connectible to one of the fixing points, at least a first stretching device part including a stretching rod extending in a longitudinal direction of the stretching device and including a threaded portion, a second stretching device part supporting a nut part to be screwed onto a thread of the first stretching device part; and

a coupling part, arranged between said first and said second stretching device parts, to, by snap action, allow mutual rotation of the two stretching device parts in at least a direction of rotation which corresponds to tightening of the stretching device and to counteract rotation in the opposite direction.

2. A lashing device as claimed in claim 1 , wherein said coupling part includes an engaging part to, by said snap action, cooperate with a gripping part, the engaging part and the gripping part being each separately connected with either the first or the second stretching device part.

3. A lashing device as claimed in claim 2 , wherein the engaging part is arranged to be movable in a direction away from said gripping part during mutual rotation of the two stretching device parts in at least the direction of rotation that corresponds to tightening of the stretching device.

4. A lashing device as claimed in claim 2 , wherein said engaging part is arranged as a locking device to, by lock action, lock against mutual rotation of the stretching device parts in the direction opposite to tightening of the stretching device.

5. A lashing device as claimed in claim 2 , wherein an engaging portion of said engaging part is arranged to be clamped between an abutment of said gripping part and an abutment of the engaging part during mutual rotation between the stretching device parts in the direction opposite to tightening of the stretching device.

6. A lashing device as claimed in claim 5 , wherein the gripping part is arranged to move the engaging portion of said engaging part away from said abutment of the engaging part during mutual rotation between the stretching device parts in said direction of tightening the stretching device.

7. A lashing device as claimed in claim 2 , wherein an engaging portion of said engaging part is spring loaded towards the gripping part.

8. A lashing device as claimed in claim 2 , wherein an engaging portion of said engaging part is, under spring load, at least partially projectable from a peripheral surface of an opening in the coupling part into engagement with the gripping part.

9. A lashing device as claimed in claim 2 , wherein an engaging portion of the engaging part is movable along a path of travel which extends in a direction spaced from the center of said stretching rod.

10. A lashing device as claimed in claim 2 , wherein an engaging portion of said engaging part is arranged in at least one bore which extends in said coupling part.

11. A lashing device as claimed in claim 10 , wherein an end portion, positioned next to the gripping part, of said bore is designed to form an end position abutment for the engaging portion of the engaging part.

12. A lashing device as claimed in claim 1 , wherein said coupling part extends between the first and the second stretching device part during said snap action.

13. A lashing device as claimed in claim 1 , wherein said coupling part is movable relative to said stretching rod in the longitudinal direction of the stretching device.

14. A lashing device as claimed in claim 1 , wherein said coupling part is movable relative to said nut part in the longitudinal direction of the stretching device.

15. A lashing device as claimed in claim 1 , wherein said coupling part is arranged to be movable between an active position and an inactive position, the coupling part in the active position being moved over a portion of said stretching rod for locking against mutual rotation of the stretching device parts in the direction opposite to tightening of the stretching device, while mutual rotation of the stretching device parts in the direction opposite to tightening of the stretching device is allowed when the coupling part is removed from said portion in the inactive position of the coupling part.

16. A lashing device as claimed in claim 15 , wherein said portion of the stretching rod constitutes an end portion, positioned next to the coupling part, of the stretching rod.

17. A lashing device as claimed in claim 1 , wherein said coupling part is provided with a locking element for locking engagement with said stretching rod and counteraction of movement of the coupling part in the longitudinal direction of the stretching device when connecting said stretching device parts to each other.

18. A lashing device as claimed in claim 17 , wherein said locking element is made of a resilient material.

19. A lashing device as claimed in claim 17 , wherein said locking element is designed to be moved into engagement with a threaded portion of said stretching rod.

20. A lashing device as claimed in claim 17 , wherein said locking element is arranged as a yoke with a substantially part-circular portion to at least partly enclose and engage said stretching rod.