Vehicle seat with motorized pivoting movement
A vehicle seat having a pivoting function about a vertical axis (Z 1 ). The seat includes a base configured for connection to the floor (PL) of the vehicle via longitudinal rails, a support frame mounted so as to rotate on the base by means of a pivot joint (JP) of axis Z 1 and three curved slide connections (G 1 ,G 2 ,G 3 ), a seating portion frame connected to the support frame directly or via a raising mechanism, and a motorization device interposed between the base and the support frame and configured to cause rotational movement of the support frame relative to the base. The axis Z 1 of the pivot joint is eccentric with respect to a central area of the seating portion frame.
1. A vehicle seat, comprising a pivoting function about a vertical axis, the seat comprising:
a base configured for connection to the floor of the vehicle via longitudinal rails,
a support frame mounted so as to rotate on the base by means of a pivot joint and at least three curved slide connections,
a seating portion frame connected to the support frame, directly or via a raising mechanism, and
a motorization device interposed between the base and the support frame and configured to cause rotational movement of the support frame relative to the base,
wherein the axis of the pivot joint is eccentric with respect to a central area of the seating portion frame.
2. The vehicle seat according to claim 1 , wherein the motorization device comprises an electrical actuator, or a pneumatic actuator, or a hydraulic actuator.
3. The vehicle seat according to claim 1 , wherein the motorization device comprises a rack and a gearmotor with an output pinion engaged with the rack, together forming a rack-and-pinion connection, the gearmotor being fixed to one among the base and the support frame, and the rack being fixed to the other among the base and the support frame.
4. The vehicle seat according to claim 3 , wherein the rack is arcuate, preferably with a center of curvature substantially coincident with the position of the pivot joint axis.
5. The vehicle seat according to claim 3 , wherein the gearmotor is of the non-reversible type.
6. The vehicle seat according to claim 3 , wherein the gearmotor is fixed to the support frame, and the rack is fixed to the base.
7. The vehicle seat according to claim 1 , wherein the pivot joint is arranged at or near the left rear corner or right rear corner of the base of the seat, and the motorization device is arranged at or near the diagonally opposite corner.
8. The vehicle seat according to claim 7 , wherein the pivot joint occupies a first corner of the base and the three curved slide connections respectively occupy the other three corners of the base.
9. The vehicle seat according to claim 3 , wherein the gearmotor is mounted astride the rack.
10. The vehicle seat according to claim 3 , wherein the gearmotor is mounted astride the rack, with a roller opposite the driving pinion, such that the rack is sandwiched between the output pinion of the gearmotor and the roller.
11. The vehicle seat according to claim 1 , wherein one or more curved slide connections are formed by an arcuate slot arranged in one among the base and the support frame, and a complementary mushroom-head pin received in said slot and fixed to the other among the base and the support frame.
12. The vehicle seat according to claim 11 , wherein each slot has a curvature such that its center of curvature is at or near the axis of the pivot joint.
13. The vehicle seat according to claim 1 , wherein each of the three curved slide connections are formed respectively formed by three arcuate slots, wherein each of the arcuate slots extends substantially along an arc of circle centered on the pivot axis of the pivot joint, wherein the first arcuate slot extends substantially along an arc of circle with a first radius, wherein the second arcuate slot extends substantially along an arc of circle centered with a second radius, wherein the third arcuate slot extends substantially along an arc of circle with a third radius, wherein each of the first, second and third radius are greater than 20 cm.
14. The vehicle seat according to claim 1 , wherein one or more curved slide connections are formed by a jaw arranged in one among the base and the support frame, and an arcuate cheekpiece received in said jaw is fixed to the other among the base and the support frame.
15. The vehicle seat according to claim 1 , wherein the three curved slide connections are formed by first and second curved slots arranged in the support frame for receiving respective first and second corresponding mushroom-head pins attached to the base, and a third curved slot formed in the base with a third corresponding mushroom-head pin attached to the support frame.