Locking device for securing a wear element in a support in an earth moving machine

A locking device for securing a wear element in a support in an earth moving machine, comprising:

• a central shaft with a first right hand threaded segment and defining a first rotation axis and a second left hand threaded segment defining a second rotation axis,
• a first locking element screwed onto said first threaded segment and a second locking element screwed on said second threaded segment,
• screwing means in at least one of the ends of said central shaft and accessible from the outside through at least one of said locking elements,
• where said first threaded segment and said second threaded segment are attached to one another by coupling means, where said coupling means are suitable for transmitting rotational movement between said first threaded segment and said second threaded segment,
• said coupling means comprise a disc with a rotation axis and with a first face opposite one end of said first threaded segment and a second face opposite one end of said second threaded segment, where between said first face and the end of the first threaded segment there is a first tongue and groove extending according to a first diameter, such that said disc, and said first threaded segment are suitable for moving with respect to one another according to said first diameter, and between said second face and the end of the second threaded segment there is a second tongue and groove extending according to a second diameter, such that said disc and said second threaded segment are suitable for moving with respect to one another according to said second diameter.