Automatically retractable movable seat frame and sofa

Abstract

The automatically retractable movable seat frame includes at least one stretching device, including a linkage mechanism, including a driving elastic member, a rotating rack, and a linkage rack, the driving elastic member being assembled between the rotating rack and the linkage rack; a leg mechanism, hinged to a front end of the linkage rack, a drag link being hinged between the rotating rack and the leg mechanism; a seat mechanism, hinged to a rear end of the leg mechanism; and a rotating mechanism, connected to the rotating rack, configured to drive the rotating rack to rotate, so that the stretching device is switched between a sitting position and a relaxing position, in which the driving elastic member stretches and retracts with the rotation of the rotating rack, and the rotating rack is driven to rotate, so that the leg mechanism is folded.

1 . An automatically retractable movable seat frame, comprising at least one stretching device, wherein the stretching device comprises:
 a linkage mechanism, comprising a driving elastic member, a rotating rack, and a linkage rack, the driving elastic member being assembled between the rotating rack and the linkage rack;   a leg mechanism, hinged to a front end of the linkage rack, a drag link being hinged between the rotating rack and the leg mechanism;   a seat mechanism, hinged to a rear end of the leg mechanism; and   a rotating mechanism, connected to the rotating rack, configured to drive the rotating rack to rotate, so that the stretching device is switched between a sitting position and a relaxing position,   wherein the driving elastic member is capable of stretching and retracting with rotation of the rotating rack, and the driving elastic member is capable of driving the rotating rack to rotate when the rotating rack is rotated to a preset position, so that the leg mechanism is folded.   
     
     
         2 . The automatically retractable movable seat frame according to  claim 1 , wherein the leg mechanism comprises a first front link, a second front link, a leg mounting rack, a third front link, and a fourth front link; an end of the first front link is hinged to a front end of the seat mechanism, the second front link is hinged between the leg mounting rack and an opposite end of the first front link, the third front link is hinged between the leg mounting rack and an end of the fourth front link, an opposite end of the fourth front link is hinged to a front end of the linkage rack, the drag link is hinged to a middle of the fourth front link, and the opposite end of the fourth front link extends toward the seat mechanism to form an extension part of the seat mechanism. 
     
     
         3 . The automatically retractable movable seat frame according to  claim 2 , further comprising a front extension mounting rack, wherein both the second front link and the third front link are hinged to the front extension mounting rack. 
     
     
         4 . The automatically retractable movable seat frame according to  claim 2 , wherein the linkage rack comprises a base, a first linkage rod, a second linkage rod, a third linkage rod, and a fourth linkage rod; a front support arm is hinged between the first linkage rod and a front end of the base, a rear support arm is hinged between the first linkage rod and a rear end of the base, the rear support arm is provided with a restricting pin, a front end of the second linkage rod is hinged to the fourth front link, a rear end of the second linkage rod is hinged to an end of the third linkage rod, an opposite end of the third linkage rod is hinged to the first linkage rod by the fourth linkage rod, and the fourth linkage rod is provided with a restricting groove snap-fitted with the restricting pin; the restricting pin is separated from the restricting groove when an angle between the leg mounting rack in the present position and the leg mounting rack in the sitting position is less than or equal to 40°, and the driving elastic member is capable of driving the rotating rack to rotate, so that the leg mechanism is folded. 
     
     
         5 . The automatically retractable movable seat frame according to  claim 4 , wherein the seat mechanism comprises a seat mounting rack, hinged to a rear end of the first front link, and the extension part of the fourth front link is hinged to the seat mounting rack. 
     
     
         6 . The automatically retractable movable seat frame according to  claim 5 , further comprising a backrest mechanism, wherein the backrest mechanism comprises a backrest mounting rack, a first rear link, and a second rear link, a front end of the backrest mounting rack is hinged to a rear end of the seat mounting rack, both an end of the first rear link and an end of the second rear link are sequentially hinged to the backrest mounting rack in a direction distal to the seat mechanism, an opposite end of the first rear link is provided with a movable long groove, a sliding pin slides with respect to the movable long groove, and both an opposite end of the second rear link and a rear end of the second linkage rod are hinged to the sliding pin. 
     
     
         7 . The automatically retractable movable seat frame according to  claim 6 , further comprising a seat link, hinged between a front end of the backrest mounting rack and a front end of the first linkage rod, and a middle of the seat link is hinged to a middle of the seat mounting rack. 
     
     
         8 . The automatically retractable movable seat frame according to  claim 1 , wherein the driving elastic member comprises at least one driving spring, and the driving spring is assembled between the rotating rack and the linkage rack. 
     
     
         9 . The automatically retractable movable seat frame according to  claim 2 , wherein the driving elastic member comprises at least one driving spring, and the driving spring is assembled between the rotating rack and the linkage rack. 
     
     
         10 . The automatically retractable movable seat frame according to  claim 3 , wherein the driving elastic member comprises at least one driving spring, and the driving spring is assembled between the rotating rack and the linkage rack. 
     
     
         11 . The automatically retractable movable seat frame according to  claim 4 , wherein the driving elastic member comprises at least one driving spring, and the driving spring is assembled between the rotating rack and the linkage rack. 
     
     
         12 . The automatically retractable movable seat frame according to  claim 5 , wherein the driving elastic member comprises at least one driving spring, and the driving spring is assembled between the rotating rack and the linkage rack. 
     
     
         13 . The automatically retractable movable seat frame according to  claim 6 , wherein the driving elastic member comprises at least one driving spring, and the driving spring is assembled between the rotating rack and the linkage rack. 
     
     
         14 . The automatically retractable movable seat frame according to  claim 7 , wherein the driving elastic member comprises at least one driving spring, and the driving spring is assembled between the rotating rack and the linkage rack. 
     
     
         15 . The automatically retractable movable seat frame according to  claim 1 , wherein the rotating mechanism comprises a rotating link, and the rotating link is fixedly connected to the rotating rack. 
     
     
         16 . The automatically retractable movable seat frame according to  claim 2 , wherein the rotating mechanism comprises a rotating link, and the rotating link is fixedly connected to the rotating rack. 
     
     
         17 . The automatically retractable movable seat frame according to  claim 3 , wherein the rotating mechanism comprises a rotating link, and the rotating link is fixedly connected to the rotating rack. 
     
     
         18 . The automatically retractable movable seat frame according to  claim 4 , wherein the rotating mechanism comprises a rotating link, and the rotating link is fixedly connected to the rotating rack. 
     
     
         19 . The automatically retractable movable seat frame according to  claim 5 , wherein the rotating mechanism comprises a rotating link, and the rotating link is fixedly connected to the rotating rack. 
     
     
         20 . A sofa, comprising an automatically retractable movable seat frame, the automatically retractable movable seat frame comprising at least one stretching device, wherein the stretching device comprises:
 a linkage mechanism, comprising a driving elastic member, a rotating rack, and a linkage rack, the driving elastic member being assembled between the rotating rack and the linkage rack;   a leg mechanism, hinged to a front end of the linkage rack, a drag link being hinged between the rotating rack and the leg mechanism;   a seat mechanism, hinged to a rear end of the leg mechanism; and   a rotating mechanism, connected to the rotating rack, configured to drive the rotating rack to rotate, so that the stretching device is switched between a sitting position and a relaxing position,   wherein the driving elastic member is capable of stretching and retracting with rotation of the rotating rack, and the driving elastic member is capable of driving the rotating rack to rotate when the rotating rack is rotated to a preset position, so that the leg mechanism is folded.