Swing chassis device

Abstract

A swing chassis device includes a base, a first swing seat, and a second swing seat. The first swing seat is hinged onto the base through a first rotating shaft. The second swing seat is hinged onto the first swing seat through a second rotating shaft. The second swing seat can swing back and forth. The first swing seat can drive the second swing seat to swing left and right together. Further, an elastic buffer member is disposed between the first swing seat and the base. The base is configured to be connected a chair leg air rod. Under the action of the first swing seat, the first swing seat can swing left and right on the base, and the second swing seat can swing back and forth on the first swing seat and can swing left and right together with the first swing seat under the driving of the first swing seat.

What is claimed is: 
     
         1 . A swing chassis device, comprising a base, a first swing seat, and a second swing seat, the first swing seat is hinged onto the base through a first rotating shaft arranged in a front-rear direction, the second swing seat is hinged onto the first swing seat through a second rotating shaft arranged in a left-right direction, the first swing seat is configured to drive the second swing seat to swing left and right on the base, the second swing seat is configured to be connected to a chair seat and swing back and forth on the first swing seat, and an elastic buffer member is provided between the first swing seat and the base and is configured to provide swing buffering and a restoring force for the first swing seat. 
     
     
         2 . The swing chassis device according to  claim 1 , wherein a first mounting hole is formed on one of the first swing seat and the base, a first locking hole is formed on the other one of the first swing seat and the base, a first locking member is inserted into the first mounting hole, the first locking member is selectively slidably disposed on the first swing seat and the base and selectively enters or leaves the first locking hole, and the first locking member is configured to selectively enter the first locking hole to lock the first swing seat and the base or selectively leave the first locking hole to unlock the first swing seat and the base. 
     
     
         3 . The swing chassis device according to  claim 2 , wherein the first locking member is disposed in the left-right direction, an operating rod disposed in the left-right direction is inserted into the base and the first swing seat, and the operating rod is connected to the first locking member and is configured so that the operating rod is pulled to drive the first locking member to leave or enter the first locking hole. 
     
     
         4 . The swing chassis device according to  claim 3 , wherein a push-pull torsion spring is sleeved on the operating rod, one torsion spring arm of the push-pull torsion spring is fixed to the operating rod, the other torsion spring arm of the push-pull torsion spring is disposed on the first locking member, and the push-pull torsion spring is configured so that the operating rod drives the first locking member to move via the push-pull torsion spring. 
     
     
         5 . The swing chassis device according to  claim 4 , wherein the push-pull torsion spring has a bent portion bent downward and abuts against the base, a convex portion is provided on the base, and the convex portion is configured so that when the operating rod moves, the bent portion crosses the convex portion to allow the first locking member to enter or leave the first locking hole. 
     
     
         6 . The swing chassis device according to  claim 2 , wherein an operating rod is provided on the base or the first swing seat and is selectively rotatable, the operating rod is arranged in the left-right direction, the first locking member is arranged in the front-rear direction, and the operating rod is connected to the first locking member and is configured so that the operating rod rotates to drive the first locking member to leave or enter the first locking hole. 
     
     
         7 . The swing chassis device according to  claim 6 , wherein a push-pull torsion spring is sleeved on the operating rod, one torsion spring arm of the push-pull torsion spring is fixed to the operating rod, the other torsion spring arm of the push-pull torsion spring is disposed on the first locking member, and the push-pull torsion spring is configured so that the operating rod drives the first locking member to move via the push-pull torsion spring. 
     
     
         8 . The swing chassis device according to  claim 6 , wherein a gear seat is provided on the base or the first swing seat, the operating rod is provided with a synchronously rotating gear member, a gear slot is provided on the gear seat, the gear member is inserted into the gear slot, the gear slot has a first gear and a second gear, a convex portion protruding toward the gear slot is provided between the first gear and the second gear, the gear member switches between the first gear and the second gear by crossing the convex portion. 
     
     
         9 . The swing chassis device according to  claim 1 , wherein the second swing seat comprises two end plates located at left and right sides, and the second rotating shaft is disposed in a middle of the end plates and passes through the first swing seat and the two end plates, a rotation slot is formed on one end plate beside the second rotating shaft, a second locking hole is correspondingly formed on the other end plate, relative rotation between the second swing seat and the first swing seat is unlocked or locked by a second locking member, a second mounting hole is provided on the first swing seat, the second locking member is inserted into the rotation slot and the second mounting hole, the second locking member is selectively slidably disposed on the first swing seat and the second swing seat in the left-right direction, the second locking member is configured to selectively enter the second locking hole to lock the first swing seat and the second swing seat or selectively leave the second locking hole to unlock the second swing seat and the first swing seat, and when the second locking member leaves the second locking hole and the second swing seat rotates relative to the first swing seat, the second locking member moves in the rotation slot. 
     
     
         10 . The swing chassis device according to  claim 1 , wherein the elastic buffer member is a spring, there are at least two springs symmetrically distributed on both sides of the first rotating shaft, a lower end of each spring abuts against the base, an upper end of each spring abuts against the first swing seat, a bottom portion of the base is provided with an opening, the opening is coaxial with the spring, and the spring is disposed at the opening, the base is formed with an upwardly protruding limiting portion around the opening, and the limiting portion protrudes upwardly to enter the spring. 
     
     
         11 . The swing chassis device according to  claim 1 , wherein the elastic buffer member is a buffer restoring torsion spring sleeved on the first rotating shaft. 
     
     
         12 . The swing chassis device according to  claim 1 , wherein a back connecting member is provided on the first swing seat and is configured to be connected to a chair back and swing with the swing of the first swing seat. 
     
     
         13 . The swing chassis device according to  claim 12 , wherein a front end of the back connecting member is rotatably connected onto the first swing seat, and the back connecting member and the second swing seat are linked by a linkage structure configured to drive the second swing seat to swing back and forth when the back connecting member rotates on the first swing seat. 
     
     
         14 . The swing chassis device according to  claim 13 , wherein the linkage structure comprises a slidable rotating member and a slidable rotating slot, a connecting seat is extended obliquely downward from the rear of the second swing seat, the connecting seat is connected to the slidable rotating member arranged in the left-right direction, the slidable rotating slot is provided on the back connecting member, the slidable rotating member is inserted into the slidable rotating slot, and when the back connecting member rotates on the first swing seat, the slidable rotating member and the slidable rotating slot move and rotate relative to each other and drive the second swing seat to swing back and forth. 
     
     
         15 . The swing chassis device according to  claim 1 , wherein the base has a bottom plate at a bottom portion, a protruding portion protrudes upward or downward on the bottom plate, the protruding portion comprises a longitudinal protruding portion and a lateral protruding portion, the longitudinal protruding portion is configured to provide support when the first swing seat swings left and right, and the lateral protruding portion is configured to provide support when the second swing seat swings back and forth. 
     
     
         16 . The swing chassis device according to  claim 15 , wherein the longitudinal protruding portion is arranged in the front-rear direction, the lateral protruding portion is arranged in the left-right direction, the longitudinal protruding portion and the lateral protruding portion intersect to form a cross shape, an intersection of the longitudinal protruding portion and the lateral protruding portion coincides with a center position of the bottom plate, and an insertion hole for inserting an air rod is opened at the center position of the bottom plate. 
     
     
         17 . The swing chassis device according to  claim 16 , wherein an intersection point of projections of axes of the first rotating shaft and the second rotating shaft on the bottom plate falls within a coverage of the insertion hole. 
     
     
         18 . The swing chassis device according to  claim 16 , wherein the base comprises a bottom shell and a shaft seat, the bottom shell comprises the bottom plate, the shaft seat is disposed in the bottom shell, one end of the first rotating shaft is disposed on the shaft seat and remains relatively stationary with the shaft seat, the other end of the first rotating shaft protrudes outward from the bottom shell and is rotatably connected to the first swing seat, the protruding portion protrudes downward from the bottom plate, a positioning groove is formed on an upper surface of the bottom plate at a position of the protruding portion, a positioning portion protrudes downwardly from a lower end of the shaft seat, the positioning portion is disposed in the positioning groove, the elastic buffer member is a spring, and the spring is vertically disposed in a positioning groove formed by the lateral protruding portion. 
     
     
         19 . The swing chassis device according to  claim 1 , wherein the first swing seat comprises a main body portion and a support seat protruding from an upper surface of the main body portion, and a gap is provided between the second swing seat and the main body portion. 
     
     
         20 . The swing chassis device according to  claim 19 , wherein the main body portion comprises a horizontal supporting portion and a tilt supporting portion, the support seat comprises a first support protruding seat and a second support protruding seat, the horizontal supporting portion is arranged horizontally, the tilt supporting portion is arranged at a rear end of the horizontal supporting portion in a downwardly inclined manner, the first support protruding seat is disposed on the horizontal supporting portion and protrudes from an upper surface of the horizontal supporting portion, the second support protruding seat is disposed on the tilt supporting portion and protrudes from an upper surface of the tilt supporting portion, when the second swing seat is horizontal, it abuts against the first support protruding seat, and when the second swing seat tilts backward, it abuts against the second support protruding seat.