Patent ID: 7497516

Claim:
A mobile joint ( 1 ) for a seating construction for mounting between a seat device ( 100 ) of a seating construction and a support ( 200 ) for said seat device ( 100 ), comprising at least two joint elements ( 10 , 30 ) wherein each joint element is pivotable to a limited degree in relation to each joint element that it is connected to, permitting the mobile joint ( 1 ) to pivot between two extreme positions in order to allow a tilting movement of the seat device ( 100 ), effected by the user's weight displacement, wherein the mobile joint contains a first joint element ( 10 ) mountable at a first end to the support ( 200 ) and at a second end only mounted pivotally to a first end of a middle joint element ( 20 ) at a first rotational axis ( 40 ), and further containing a second joint element ( 30 ) mountable at a first end to the seat device ( 100 ) and at the second end only mounted pivotally to a second end of the middle joint element ( 20 ) in a second rotational axis ( 50 ), wherein the said rotational axes ( 40 , 50 ) are horizontally displaced in relation to each other, and whereby the joint ( 1 ) assumes a stable tilting position between the two extreme positions when the user's center of gravity is above a point between the first and second rotational axes; wherein at least two of the joint elements ( 10 , 20 , 30 ) are spring-loaded in relation to each other by a torsion spring.