Sofa extension apparatus

A sofa extension apparatus, comprising a sofa frame, two extension brackets, a first linkage rod, a second linkage rod and a linear drive assembly, wherein each of the two extension brackets comprises a sofa fixing member and a leg portion extension assembly, the sofa fixing member is connected to the sofa frame, the leg portion extension assembly is rotatably connected to a front end of the sofa fixing member, each of two ends of the first linkage rod is fixedly connected to a respective one of rear ends of two sofa fixing members, each of two ends of the second linkage rod is connected to a respective one of two leg extension assemblies, and the linear drive assembly is configured to drive the first linkage rod and the second linkage rod to move relative to each other, so as to enable the two extension brackets to be extended or retracted;

• and
• wherein an angle of inclination between the sofa fixing member and a horizontal plane is 5° to 10°, to enable the linear drive assembly to be always above a lower surface of the sofa frame;
• wherein the leg portion extension assembly comprises a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod and a first footrest frame, and each of two ends of the second linkage rod is fixedly connected to a respective one of two second connecting rods;
• a middle portion of the sofa fixing member is rotatably connected to a first end of the first connecting rod, a second end of the first connecting rod is rotatably connected to a first end of the third connecting rod, a second end of the third connecting rod is rotatably connected to the first footrest frame through a first rotation shaft;
• a front end of the sofa fixing member is rotatably connected to a first end of the second connecting rod, a middle portion of the second connecting rod is rotatably connected to a middle portion of the third connecting rod, and a second end of the second connecting rod is rotatably connected to a first end of the fourth connecting rod through a second rotation shaft;
• and
• a second end of the fourth connecting rod is rotatably connected to the first footrest frame through a third rotation shaft;
• wherein the leg portion extension assembly further comprises a footrest support member and a second footrest frame;
• a second end of the fourth connecting rod is rotatably connected to a first end of the footrest support member through a fourth rotation shaft, a second end of the footrest support member is rotatably connected to a middle portion of the second footrest frame, an end of the second footrest frame is rotatably connected to the first footrest frame through a fifth rotation shaft, the first rotation shaft, the third rotation shaft and the fifth rotation shaft are arranged in a triangular shape, the second rotation shaft, the third rotation shaft and the fourth rotation shaft are distributed in sequence in an extending direction of the fourth connecting rod;
• and
• rotation of the second connecting rod is capable of driving the first footrest frame and the second footrest frame to be extended or retracted, so that when the first footrest frame and the second footrest frame are in a normal fully retracted state, a front end surface of the first footrest frame and a front end surface of the second footrest frame form an included angle;
• wherein the front end surface of the first footrest frame is mounted with a first footrest plate, the front end surface of the second footrest frame is mounted with a second footrest plate, and an included angle between the first footrest plate and the second footrest plate is approximately 90°.