This is safe storage mechanism to match sectional sofa beds.
Power spring can chose 2 or 4 pieces which depends on how much of
the seat weight.
Cylinder storage is very dangerous for kids in case cyinder doesn't
work after a certain while.
Sofa bed needs a storage to load bed sheet and pillows etc.
Mechanism is hided inside the timber box and can't catch the
mechanism from outside.
It is free for width of sofa bed.
This mechanism can lower the cost of sofa bed.
This mechanism is locked by front skirt board.
It needs one or two ring handles to open the sofa beds.
