The reliability of joints and cabinet furniture.

摘要

The objective of the study was to determine the distribution of strains and strength for some selected detachable and non-detachable furniture joints and to assess the probability of the damage-free operation of these joints and to determine probability of failure-free operation of case furniture constructions assembled with the assistance of these connections. Strength investigations were carried out on three populations of angle joints, 10 items each, in which two types of fasteners were used: a Confirmat type of bolt o5x50 mm, beech dowels of o6x32 mm dimensions and o8x32 mm dowels. The joints were made from non-veneered particle boards. Strength and stresses of selected angle joints probability characteristics were elaborated. In the case 6 mm dowel joint, the probability of failure-free operation amounts to 0.927149, but the reliability of the furniture construction concerning this joints is equal 0.546004. For the o8 mm dowel joint, this probability amounts to 0.999178, whereas for the bolt joint of the Confirmat type - to 0.999999. The reliability of the furniture concerning this joints is equal 0.993442 and 0.999992. Only the application of high reliability joints or systems employing additional safety precautions can improve significantly the reliability of furniture and prolong the period of their utilisation.