Mechanical stretching device for multifunctional convertible sofa
View Patent ↗A mechanical stretching device includes first, second, third and fourth foot levers, a side plate, first, second, third, fourth, fifth and sixth connecting rods, a first support member, a second support member, a linkage member, a connecting member, a rotating shaft transmission member, a spring, and a bottom connecting rod. A first limiting surface and a second limiting surface are disposed on the second foot lever, a third limiting surface is disposed on the fourth foot lever, a fourth limiting surface and a fifth limiting surface are disposed on the side plate, a sixth limiting surface and a seventh limiting surface are disposed on the second connecting rod, an eighth limiting surface is disposed on the sixth connecting rod, a ninth limiting surface is disposed on the first support member, and a tenth limiting surface is disposed on the linkage member.
1. A mechanical stretching device for a multifunctional convertible sofa, comprising a first foot lever, a second foot lever, a third foot lever, a fourth foot lever, a side plate, a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a fifth connecting rod, a sixth connecting rod, a first support member, a second support member, a linkage member, a connecting member, a rotating shaft transmission member, a spring, and a bottom connecting rod; wherein
one end of the sixth connecting rod is rotatably connected to the fourth foot lever, the other end of the sixth connecting rod is rotatably connected to the rotating shaft transmission member; the fourth foot lever is rotatably connected to the side plate, the fifth connecting rod, and the second foot lever respectively; the third foot lever is rotatably connected to the side plate, the first foot lever, and the second foot lever respectively; the second support member is rotatably connected to the bottom connecting rod and the fourth connecting rod respectively; the fourth connecting rod is rotatably connected to the second connecting rod and the linkage member respectively; the second connecting rod is rotatably connected to the side plate; the third connecting rod is rotatably connected to the second support member and the connecting member respectively; the connecting member is rotatably connected to the side plate and the fifth connecting rod respectively; the linkage member is rotatably connected to the side plate, the first connecting rod, and the first support member respectively; the first support member is rotatably connected to the bottom connecting rod; and one end of the spring is fixed on the side plate, and the other end of the spring is fixed on the sixth connecting rod.
2. The mechanical stretching device for a multifunctional convertible sofa according to claim 1 , wherein a first limiting surface and a second limiting surface are disposed on the second foot lever, a third limiting surface is disposed on the fourth foot lever, a fourth limiting surface and a fifth limiting surface are disposed on the side plate, a sixth limiting surface and a seventh limiting surface are disposed on the second connecting rod, an eighth limiting surface is disposed on the sixth connecting rod, a ninth limiting surface is disposed on the first support member, and a tenth limiting surface is disposed on the linkage member.
3. The mechanical stretching device for a multifunctional convertible sofa according to claim 2 , wherein a leg portion limiting rivet fitting the second limiting surface and the first limiting surface is fixed on the third foot lever, a seat portion limiting rive fitting the fourth limiting surface and a lying posture limiting rivet fitting the seventh limiting surface are fixed on the side plate, a first sitting posture limiting rivet fitting the tenth limiting surface is fixed on the connecting member, a second sitting posture limiting rivet fitting the ninth limiting surface and a third sitting posture limiting rivet fitting the fifth limiting surface are fixed on the linkage member, and a lock limiting rivet fitting the eighth limiting surface is fixed on the rotating shaft transmission member.
4. The mechanical stretching device for a multifunctional convertible sofa according to claim 1 , further comprising a calf plate and a foot rest plate, wherein the calf plate is rotatably connected to the first foot lever and the second foot lever respectively, and the foot rest plate is rotatably connected to the second foot lever and the first foot lever respectively.
5. The mechanical stretching device for a multifunctional convertible sofa according to claim 1 , further comprising a handle, a pulling cable, and a pulling cable rack, wherein one end of the pulling cable is connected to the handle, the other end of the pulling cable is connected to the pulling cable rack, and the pulling cable rack is connected to the rotating shaft transmission member.
6. The mechanical stretching device for a multifunctional convertible sofa according to claim 1 , further comprising a back member, wherein the back member is rotatably connected to the first connecting rod and the side plate respectively.
7. The mechanical stretching device for a multifunctional convertible sofa according to claim 1 , further comprising a first mounting plate and a second mounting plate, wherein the first mounting plate and the second mounting plate are both fixed on the side plate.