Лесотехнически Университет

Summary

Plywood is a widely used material in the construction of different furniture types. The production of seating furniture – chairs, armchairs, etc., has the highest share. Knowing plywood’s properties is a prerequisite for its efficient use in the industrial production and improvement of the quality of consumer products. The objective of this study is to evaluate the influence of the veneer quality on the density, bending strength and modulus of elasticity of 20-21 mm thick plywood made of beech veneer.

The results showed that the veneer quality does not have an impact on the density, bending strength, and modulus of elasticity. Load direction under bending has a significant influence on the strength and deformation properties.

The results of this study will provide an opportunity for optimization of furniture construction made of beech plywood.

Summary

The paper shows the results of the studies on the strength characteristics of the end corner joints of the structural elements of solid beech wood with a cross section of 50 x 25 mm used in the construction of seating furniture.

It has been found out that, on the basis of the values of the destructive bending moment, the non-dismountable end corner joints are arranged in the following descending order: half-open mortise and tenon joint; blind stub mortise and tenon joint with dowel and cross dowel; blind stub mortise and tenon joint and dowel joints.

It has been found out that, on the basis of the values of the destructive bending moment, the dismountable end corner joints are arranged in the following descending order: joints with two one-piece connectors “Confirmat” following by joint with two universal connectors with bolt and cross dowel.

It is recommended to use the studies’ results in calculating the dimensions of seating furniture.

Summary

Concealed hinges are most often used in modern furniture constructions. More and more hinge manufacturers are paying attention to this product group with the aim to improve strength and functional characteristics. To establish the suitability of these hinges for application in furniture constructions have been developed European standards. They however embedded only test in which the hinges have to pass or fail a certain test. No data for quantitative measurements related to the functional and operational characteristics of the hinges were found in the literature.

In this study was established information about deformation resistance of concealed hinges under adverse load conditions. Loads of 20 kg and 30 kg were applied vertically to the hinged door on vertical axis. The deflection and the functional parameters were measured.

After the tests it was found out the following:

Different models of hinges have different deflection resistance;

In some hinges the deformations are out of the acceptable values according to the standard.

Summary

In this work, the ultimate tensile strength of some T-shape corner joints of structural elements of solid beech wood with cross section 50 x 25 mm used in the construction of seating furniture is investigated. It has been found that with reference to the value of ultimate tensile strength, the glued T-shape corner joints are arranged in the following descending series: with stub mortise and tenon; with wedged mortise and tenon; with stub mortise and tenon and dowel, with dowels. With reference to the value of the ultimate tensile strength the dismountable end corner joints are arranged in the following descending series: with two connectors with screw and cross dowel; with two one-piece connectors “Confirmat”. It is recommended that the results from this research can be utilized when calculating the dimensions of seating furniture.