1. There are lift up sofa seat storage mechanism hinges opens with 60 degrees therefore it well fits to sofa, love seat and chair seat lift storage design.
2. This sofa storage hinge is also quite good for seat width ottoman storage design.
3. Hinge degree is inversely proportional to upper frame length,seat storage needs big degree of hinges but bed frame need small degree of hinges.
4. Make use of the empty space under the seat of stationary sofa.