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A motor vehicle seat adapted to receive a safety belt includes a seating part and a back part on either side of an articulation zone. Each of the parts includes a frame with two arms abutting the articulation zone, the two arms forming respectively side members for the seat and vertical members for

A motor vehicle seat adapted to receive a safety belt includes a seating part and a back part on either side of an articulation zone. Each of the parts includes a frame with two arms abutting the articulation zone, the two arms forming respectively side members for the seat and vertical members for the back: the ends of the two arms of one of the parts and the ends of the two arms of the part are mounted each rotating via a pivot in a bearing. The pivot is borne by one part and the bearing by the other part, and an energy-absorbing element is provided between at least a pivot and its corresponding bearing.

대표청구항 ▼

1. A motor vehicle seat designed to receive a safety belt and comprising a seat part ( 10 ) and a back part ( 20 ) on either side of a hinging zone, each of said parts ( 10 , 20 ) comprising a frame with two arms ( 12 - 13 , 22 - 23 ) terminating at the hinging zone, the two arms ( 12 - 13 , 22 - 23

1. A motor vehicle seat designed to receive a safety belt and comprising a seat part ( 10 ) and a back part ( 20 ) on either side of a hinging zone, each of said parts ( 10 , 20 ) comprising a frame with two arms ( 12 - 13 , 22 - 23 ) terminating at the hinging zone, the two arms ( 12 - 13 , 22 - 23 ) respectively forming seat side members ( 12 , 13 ) and back upright members ( 22 , 23 ), the ends of the two arms ( 22 , 23 ) of one part ( 20 ) of said parts and the ends of the two arms ( 12 , 13 ) of the other part ( 10 ) being each rotatably mounted by means of a pivot ( 24 , 25 ) in a bearing ( 14 , 15 ), the pivot ( 24 , 25 ) being carried by one part ( 20 ) and the bearing ( 14 , 15 ) by the other part ( 10 ), an energy absorbing means ( 40 ) being provided between at least one pivot ( 25 ) and its corresponding bearing ( 15 ), wherein a stiffening tubular crosspiece ( 30 ) is arranged between the pivots ( 24 , 25 ) carried by the ends of the arm ( 22 , 23 ) of said one ( 20 ) of the parts and the energy absorbing means ( 40 ) is arranged within said crosspiece ( 30 ). 2. A seat according to claim 1, characterized in that the energy absorbing means ( 40 ) has at least one elastic element. 3. A seat according to claim 2, characterized in that the energy absorbing means ( 40 ) has at least two elastic elements ( 43 , 44 ). 4. A seat according to claim 3, characterized in that the two elastic elements ( 43 , 44 ) that are designed to come into operation, one ( 43 ) instantly without play, the other ( 44 ) being delayed further to a displacement determined by an amount of play. 5. A seat according to claim 4, characterized in that the one of the elastic elements ( 44 ), having delayed operation, is given a certain amount of play in one direction and a different amount of play in another direction. 6. A seat according to claim 1, characterized in that the ends of the two upright members ( 22 , 23 ) of the back part ( 20 ) being joined by the stiffening crosspiece ( 30 ) whose ends, extending to the outside of the upright members ( 22 , 23 ) of the back part ( 20 ), form pivots ( 25 , 26 ) for hinging in two bearings ( 14 , 15 ) housed on said ends, each of said bearings has, in relief on its external face, an engaging means ( 38 ) that is designed to cooperate by complementarity of shape with a receiving means ( 39 ) arranged in the hinging zone of the corresponding seat side member ( 12 , 13 ). 7. A seat according to claim 1, characterized in that the energy absorbing means is an elastic element designed to undergo a permanent deformation in case of impact. 8. A seat according to claim 7, characterized in that the elastic element is divided into at least two parts, at least one of these parts having undergone a treatment to modify its elastic limit. 9. A seat according to claim 1, characterized in that the absorbing means has at least one torsion bar ( 40 ) with one ( 41 ) of its ends fixed in one ( 15 ) of the bearings and connected by a coupling block ( 50 ) to the tubular crosspiece ( 30 ). 10. A seat according to claim 9, characterized in that the torsion bar ( 40 ) is of non-circular section. 11. A seat according to claim 10, characterized in that the other end ( 42 ) of the torsion bar ( 40 ) fits in a housing of similar shape but of larger dimensions so as to block said end ( 42 ) in rotation only beyond a certain angle of rotation. 12. A seat according to claim 11, characterized in that the other end of the torsion bar ( 40 ) fits in a housing ( 16 ) of cross-section delimited by two squares centered on an axis and with an angular offset with a predetermined displacement angle, the rotational displacement of each vertex of the cross-section of the bar being delimited by two flat bearing surfaces ( 17 ) connected along a circular arc ( 18 ) of diameter at least equal to a diagonal of the bar ( 40 ). 13. A seat according to claim 10, characterized in that a difference provided between the distances separating the coupli ng block ( 50 ) from the two ends ( 41 , 42 ) of the bar ( 40 ) distributes stresses applied on the seat side members ( 12 , 13 ). 14. A seat according to claim 13, characterized in that sleeves ( 146 ) mounted on the torsion bar ( 40 ) are designed to guide the coupling block ( 50 ). 15. A seat according to claim 9, further comprising sleeves inserted one of in the tubular crosspiece ( 30 ) and on the torsion bar ( 40 ), which limit axial displacements of the coupling block ( 50 ). 16. A seat according to claim 9, characterized in that the tubular crosspiece ( 30 ) has at least one helical rail ( 31 , 131 ) cooperating with at least one corresponding groove ( 51 ) arranged on the coupling block ( 50 ), the torsion bar ( 40 ) blocking any relative rotary motion between said block ( 50 ) and said bar ( 40 ) but permitting their free relative sliding. 17. A seat according to claim 16, characterized in that said at least one helical rail ( 31 , 131 ) extends over a fraction of the length of the crosspiece ( 30 ). 18. A seat according to claim 17, characterized in that one of the ends ( 132 ) of the rail ( 131 ) is configured as a stop limiting axial displacement of the coupling block ( 50 ). 19. A seat according to claim 16, characterized in that the coupling block ( 50 ) having a tapped through-hole ( 52 ), a screw ( 60 ) parallel to an axis ( 1 ), free to rotate but blocked in translation and accessible by at least one of its ends, constitutes a means for fine adjustment of a slope of the back part ( 20 ). 20. A seat according to claim 19, characterized in that said screw ( 60 ) is designed to be operated by at least one of its ends. 21. A seat according to claim 19, further comprising a device for manual selection of the slope of the back part ( 20 ) interposed between at least one ( 15 ) of the bearings carrying said one ( 20 ) of the parts and the end of the corresponding arm ( 13 ) of said other part ( 10 ). 22. A seat according to claim 21, characterized in that the device for selecting the slope of the back part ( 20 ) has a limited number of positions for angular blocking, and the means for fine adjustment is designed for continuous coverage of a range of adjustment over an angular extent greater than a difference between two successive positions for angular blocking of the selecting device.