Even if the movable backrest cushion is just placed on the sofa, will it not slide when leaning on it?
Because it is a movable backrest that is not fixed to the frame, I am asking out of curiosity about whether it will slide backward when leaning back on it.
A steel plate inserted at the lower part inside the backrest cushion anchors the weight, and a silicone pad on the bottom adds friction to provide support.
A movable backrest refers to a cushion that is used by placing it freely at any desired position on top of the seat cushion without fixing it to the sofa frame.
Without fixing hardware, it can easily slide backward when leaning back on it, so the bottom weight and friction are important. The Ink Module sofa from JACKSON CHAMELEON has a steel plate inserted inside the lower part of the backrest cushion to position the center of gravity downward[1]. In addition, a silicone non-slip pad on the bottom surface adds friction with the fabric, so even when moved to a desired spot and leaned against, it supports without easily sliding[2].
The specific weight of the steel plate inserted inside the backrest cushion or the criteria for the load capacity it can support have not yet been confirmed.