Headrest rotating mechanism, headrest structure for seat unit, and seat unit

Abstract

The present disclosure relates to a headrest rotating mechanism, configured to rotate a headrest disposed above a backrest of a seat unit relative to the backrest forward or backward, the headrest rotating mechanism including a headrest rotating device ( 3 ) and an actuating motor ( 4 ) configured to drive the headrest rotating device ( 3 ) to move, where the headrest rotating device ( 3 ) includes a pair of first side plates ( 31 ) configured to attach the headrest and a pair of second side plates ( 32 ) configured to attach the backrest, the first side plates ( 31 ) and the second side plates ( 32 ) are movably connected via a headrest joint ( 33 ). Additionally, the present disclosure further relates to a headrest structure for a seat unit and a seat unit.

What is claimed is: 
     
         1 . A headrest rotating mechanism, configured to rotate a headrest disposed above a backrest of a seat unit relative to the backrest forward or backward, the headrest rotating mechanism comprising a headrest rotating device and an actuating motor configured to drive the headrest rotating device to move,
 wherein the headrest rotating device comprises a pair of first side plates configured to attach the headrest and a pair of second side plates configured to attach the backrest, the first side plates and the second side plates are movably connected via a headrest joint, the headrest joint is disposed offset backward relative to a longitudinal central axis of the headrest and/or the backrest as viewed laterally from the seat unit when the headrest is configured to pivot forward relative to the backrest; the headrest joint is disposed offset forward relative to the longitudinal central axis of the headrest and/or the backrest as viewed laterally from the seat unit when the headrest is configured to pivot backward relative to the backrest.   
     
     
         2 . The headrest rotating mechanism according to  claim 1 , wherein a motor head of the actuating motor is connected to the second side plate, and an actuating rod of the actuating motor acts on the first side plate via a driving link. 
     
     
         3 . The headrest rotating mechanism according to  claim 2 , wherein the first side plate comprises a transverse member extending transversely, wherein the motor head is mounted on the second side plate via a fixing pin, and the actuating rod is connected to the transverse member. 
     
     
         4 . The headrest rotating mechanism according to  claim 2 , wherein a connection point between the motor head and the second side plate and a connection point between the driving link and the first side plate are located on two sides of the headrest joint. 
     
     
         5 . The headrest rotating mechanism according to  claim 1 , wherein, when the headrest is configured to pivot forward relative to the backrest, a lower end of the first side plate is configured with a first lug protruding toward a rear of the headrest laterally, and an upper end of the second side plate is configured with a second lug protruding toward the rear of the headrest; when the headrest is configured to pivot backward relative to the backrest, the lower end of the first side plate is configured with the first lug protruding toward a front of the headrest, and the upper end of the second side plate is configured with the second lug protruding toward the front of the headrest;
 wherein the first lug and the second lug are pivotally connected via the headrest joint.   
     
     
         6 . The headrest rotating mechanism according to  claim 1 , wherein the first side plate is configured to pivot relative to the second side plate at an angle of up to 50°. 
     
     
         7 . The headrest rotating mechanism according to  claim 6 , wherein an upper end of the second side plate is configured with a first limiting portion and a second limiting portion, a lower end of the first side plate is configured with a limiting member, wherein the limiting member abuts against the first limiting portion when the first side plate is not pivoted relative to the second side plate, and the limiting member abuts against the second limiting portion when the first side plate is pivoted relative to the second side plate at a maximum angle. 
     
     
         8 . The headrest rotating mechanism according to  claim 3 , wherein the transverse member is connected between the pair of first side plates. 
     
     
         9 . The headrest rotating mechanism according to  claim 1 , wherein the pair of first side plates and the pair of second side plates are respectively configured mirror-symmetrically. 
     
     
         10 . A headrest structure for a seat unit, comprising a pair of headrest brackets disposed in parallel, a pair of backrest brackets extending in parallel, a headrest rotating device configured to pivotally connect the headrest brackets relative to the backrest brackets, and an actuating motor configured to drive the headrest rotating device to move, wherein the headrest rotating device comprises a pair of first side plates attached to the headrest brackets and a pair of second side plates attached to the backrest brackets, the first side plates and the second side plates are movably connected via a headrest joint, wherein the headrest joint is disposed offset backward relative to a longitudinal central axis of the headrest brackets and/or the backrest brackets as viewed laterally from the seat unit when the headrest brackets are configured to pivot forward relative to the backrest brackets; the headrest joint is disposed offset forward relative to the longitudinal central axis of the headrest brackets and/or the backrest brackets as viewed laterally from the seat unit when the headrest brackets are configured to pivot backward relative to the backrest brackets. 
     
     
         11 . The headrest structure according to  claim 10 , wherein a motor head of the actuating motor is connected to the second side plate, and an actuating rod of the actuating motor is connected to the first side plate via a driving link. 
     
     
         12 . The headrest structure according to  claim 11 , wherein the first side plate comprises a transverse member extending transversely, wherein the motor head is mounted on the second side plate via a fixing pin, and the actuating rod is connected to the transverse member. 
     
     
         13 . The headrest structure according to  claim 11 , wherein a connection point between the motor head and the second side plate and a connection point between the driving link and the first side plate are located on two sides of the headrest joint. 
     
     
         14 . The headrest structure according to  claim 10 , wherein, when the headrest bracket is configured to pivot forward relative to the backrest bracket, a lower end of the first side plate is configured with a first lug protruding toward a rear of the headrest bracket, and an upper end of the second side plate is configured with a second lug protruding toward the rear of the headrest bracket; when the headrest bracket is configured to pivot backward relative to the backrest bracket, the lower end of the first side plate is configured with the first lug protruding toward a front of the headrest bracket, and the upper end of the second side plate is configured with the second lug protruding toward the front of the headrest bracket;
 wherein the first lug and the second lug are pivotally connected via the headrest joint.   
     
     
         15 . The headrest structure according to  claim 10 , wherein the headrest bracket is configured to pivot relative to the backrest bracket between an initial position and a limit position, the headrest bracket is not pivoted relative to the backrest bracket in the initial position, the headrest bracket is pivoted relative to the backrest bracket to a maximum extent in the limit position, so that an included angle between the headrest bracket and the backrest bracket changes, wherein the included angle changes by at most 50°. 
     
     
         16 . The headrest structure according to  claim 13 , wherein an upper end of the second side plate is configured with a first limiting portion and a second limiting portion, a lower end of the first side plate is configured with a limiting member, wherein the limiting member abuts against the first limiting portion in an initial position, and the limiting member abuts against the second limiting portion in a limit position. 
     
     
         17 . The headrest structure according to  claim 12 , wherein the transverse member is configured to be connected between the pair of headrest brackets disposed in parallel. 
     
     
         18 . The headrest structure according to  claim 10 , wherein the pair of first side plates and the pair of second side plates are respectively configured mirror-symmetrically. 
     
     
         19 . A seat unit, comprising a backrest portion and the headrest rotating mechanism according to  claim 1 . 
     
     
         20 . A seat unit, comprising a backrest portion and the headrest structure according to  claim 10  disposed above the backrest portion.