Support frames for mattresses equipped with elastic laths from deciduous plywood are a necessary element of furniture type bed equipment. In view of various properties of mattresses, different types of support frames are manufactured to ensure their best working conditions. A function to adjust (manually or electrically) the surface of a support frame, as well as additional adjustment of hardness (both the laths and holders on which the former are mounted) improve the comfort of sleep and allow every user to precisely adjust the support frame and the mattress to individual likes and needs.