Furniture Design Ideas

6.2.4.1 Stiffness of Chairs Stiffness of construction of furniture is determined by both stiffness of joints and stiffness of components. Determining the dominant element or structural node, which decides about the stiffness of the product is not simple, because in furniture several parts at the same time are actively involved. We can, however, in the […]

Screw joints are a common way of joining elements of furniture construction. They can be found in skeletons of chairs and tables, in frames of armchairs and sofas and in bodies of case furniture. As a general rule, screws are inserted into previously drilled holes, whose diameter must be adapted to the appropriate, characteristic part […]

Bolt joints are formed by drilling holes in the connected elements, inserting the screws, putting on washers and tightening the nuts (Fig. 6.86). The pressure caused by the tightening generates friction between connectors, which decreases or increases along with the changes of equivalent moisture of wood or moisture of wood-based materials. Minimal spacing and distances […]

State of stresses in a finger joint subjected to bending was presented by Tomusiak (1988), specifying the relationship of tangential stresses in the glue-line from the value of bending moment caused by concentrated force. From the point of view of the constructor, it is also necessary to take into account the effect of tangential stresses, […]

As can be seen from the previous considerations, covered mortise and tenon joints maintain elasticity as long as the glue-line joining the wooden elements is not damaged. Its strength is calculated in the same way as for bridle joints, by entering the relevant dimensions and the number of glue-lines. However, it should be noted that […]

Strength of Dowel Joints Joints with dowel connectors are particularly recognised in furniture due to the many significant benefits, including: • reducing material consumption by the size of tenons, • the simple technological process, • the uncomplicated construction. The literature on the subject recognises the model of a bent 2-D angular dowel joint (Fig. 6.50) […]

Gluing wood is one of a few methods of inseparable and stiff connecting wooden elements. Usually, these connections are done in a method that allows the use of the greatest shearing strength of the created glue-line, and during designing, they are placed in such locations of the construction in which axial and transverse forces dominate, […]

Assuming that we are dealing with a 2-D element placed in a Cartesian coordinate system XOY, in which the Z-axis is perpendicular to the other two, strains e and у can be written in a general manner by equations (Ashkenazi et al. 1958; Ambarcumian 1967; Lekhnickij 1977; Leontiev 1952; Mitinskij 1948; Norris 1942; Nowacki 1970; […]

Angular joints are the dominant structural solutions of modern skeletal wooden furniture, whose shape and proportions have changed little since the days of ancient Egypt, Greece and Rome (Dzi^gielewski and Smardzewski 1995). For several decades, attempts have been made to provide their strength in the form of mathe­matical relationships. The first calculations, aiming to determine […]

The literature shows that descriptions of tests of the state of stresses in the joints of connections of anisotropic bodies are nonlinear, and in its assumptions, they adopt many simplifications. Niskanen (1955, 1957) was the first to give the distribution of stresses in the joint of connected wooden elements. By using the model of a […]