The frame of the sofa and the overall structure of the furniture are very important factors in leather upholstery and upholstered furniture. Most people look at a beautifully upholstered sofa or armchair and don’t see what’s underneath. People do that too. A person’s appearance is determined by the muscles under the skin. These muscles are no stronger than the bony structure that makes up everything else.
The skeleton of a sofa or chair is its wooden frame. We’re talking about traditional furniture here, not items made from steel tubes and synthetic foam cushions. The sofa frame must be strong enough to withstand the stress and strain of use. For a sofa to be comfortable, it must be able to withstand this pressure without slipping.
What fits the sofa frame also fits the chair. The sofa frame must be made of solid wood. The wood should not be too hard to accept blue upholstery pins. Frames attached with nails or glue tend to be fragile and have a limited lifespan. The strongest wooden sofa frames are made using traditional joining methods. The rectangular main frame is to be built using thick solid wood beams with notches at each corner. Butt joints reinforced with dowels will separate over time, and dowel joints are not suitable for such thick frames. The sofa frame will act as the framework for the entire sofa, supporting the seat, back, and armrests. It is usually made of oak and sometimes dense conifers such as some pines. This frame is the most important aspect of furniture construction.
Traditionally, a sofa seat was supported by a layer of braided straps. 2″ or 5mm wide decorative tapes are attached to the side, front, and back frames and woven both crosswise and lengthwise. Attach the length to the frame with ¾-inch decorative nails. Belt tensioning requires a belt tensioner. Then use padding string to tie the steel spring to the tape. The top of the springs is attached using a decorative spring cord tied at the top of each spring. Each spring is connected to the spring next to it using a thread of the same length. They are tied together in eight ways, connecting all the springs together, and attaching lengths of rope to the rails on the sides, back, and front of the sofa. The canvas cover is then placed on the spring, stretched, and attached to the side rails. Then add a layer of stuffing and a layer of stuffing, then add another layer of canvas to hold it all together. Finally, the top trim is stretched and attached to the side rails.
Now you can see the importance of furniture construction and why sofa frame rails should be so strong and well connected. They held every layer of the seat, including the springs, and nailed a ton of trim loop into it. Then the rails must support the weight of at least two people, or even more for larger sofas.
Back in the day, the back of a sofa was constructed and upholstered exactly like a seat, but with shorter springs. But to save time, the spring box design is now used. The springs are held in a metal frame that is nailed to the rear frame. This method can be used because the backrest weighs less than the seat. Then add the trim layers as usual and attach them to the back frame. The back frame does not need to be as strong as the seat, and the wood used is usually smaller in size. However, the connections of the backrest to the seat and arms must be strong to prevent the backrest frame from collapsing backwards.