The end distance effect of knock-down furniture fasteners on bending moment resistance of corner joints

Abstract

AbstractŠIMEK, M., HAVIAROVÁ E., ECKELMAN C.: The end distance eff ect of knock-down furniture fasteners on bending moment resistance of corner joints. Acta univ. agric. et silvic. Mendel. Brun., 2008, LVI, No. 2, pp. 203-210 The goal of this paper is to investigate the eff ect of the end distance of cam lock fasteners on the bending moment resistance of knock-down corner joints. The preliminary study of knock-down furniture assembly plans was done in order to discover the manufacturers' fastener typical usage in case construction. Laminated particleboard, cam fasteners and wooden dowels were used for specimen construction. L-shaped joint specimens 760 mm in length were tested by pressing the joint members together -also called a compression test in the angle plane. The study results showed that cam fasteners with end distance of 60 mm from the member edges perform the best.bending moment resistance, corner joint, end distance, cam fastener, wooden dowelThe joinery for knock-down furniture has been developed and used for almost half century. A large variety of connectors for knock-down furniture exists, including cam locking types, screw in types (e.g. confi rmat, trapez), bolt tightening types (e.g. cross dowels), bracket types, hook types, and dowels used without glue. The mechanical strength of furniture depends mostly on the strength of the joints. Several investigations have been carried out on knock-down fastener joint strength. Among the most important ones are following studies.Smardzewski and Prekrad (2002) studied the stress distribution in knock-down furniture joints by means of experimental testing along with numerical simulation. They tested three diff erent joints (one cam type -VB36M/19 and two trapez types -TZ28 and TZ32S) in combination with two non-glued beech dowels (8x32mm). Their joint corner samples were made out of particleboard. The trapez joints performed the best in the tests. Results showed that the non-glued dowels played an important role in supporting the joint. Numerical simulations determined the distribution of stress in the joints and the bending moment carried by each fastener. Joščák and Černok (2002) tested the load ca paci ty of knock-down furniture joints made from laminated particleboard (18mm thick). Four types of corner joints (confi rmat type, cam type Rafi x, trapez type, and Stabilofi x) were tested in angle plane by pressing the members of the joint together, Fig. 4, and by pulling them apart. The confi rmat type joint performed the best when pressed together. Joints constructed with the Rafi x cam type connector had the lowest moment in compression. Burdurlu et al. (2006) determined the most suitable type of fi tting for the assembly of knock down panel furniture. In his study he used six knockdown furniture fi ttings (two cam types, metal locking type, trapez type, bracket type and pipe type). The direct labor, direct material, direct energy cost, and stopwatch assembly work time in construction of the furniture were observed. Cam fasteners were determined to b...

Effect of laboratory-accelerated aging treatment on the ultimate strength of a 4-sided MDF kitchen cabinet

“…Many researchers have studied the moment capacity of L-type joints as the main joint in cabinet-making by considering the effect of the types of fasteners used, distance between the fasteners, material types, loading types, etc. (Rabiej et al 1993;Zhang and Eckelman 1993;Rajak and Eckelman 1996;Liu and Eckelman 1998;Tankut 2006;Kasal 2008;Atar and Ayhan 2008;Barboutis and Vassiliou 2009;Simek et al 2010). Limited other studies focused on the maximum load-bearing capacity of a single box-type cabinet (Eckelman and Rabiej 1985;Kasal et al 2008Kasal et al , 2011 and some others explored the rigidity of L-type joints, their relation to the rigidity of the box (Lin and Eckelman 1987), and the effects of adding shelves, frames, and other factors on the rigidity of case furniture (Eckelman and Resheidat 1984;Eckelman and Munz 1987;Tankut et al 2003;Tankut 2009).…”

Mechanical Properties of Corner Joints Made of Honeycomb Panels with Double Arrow-Shaped Auxetic Cores

“…This tendency is proportional to the number of used fasteners [10,[33][34][35][36][37]; • Influence of distribution of fasteners. For instance, for double dowel joint the most effective dowel distribution equals 96 mm [38][39][40][41][42]; • Influence of fastener/joint geometry on joint stiffness. The increase in fastener length and diameter results in joint strength improvement, although increasing length is more effective [6,36,43,44].…”

“…Influence of distribution of fasteners. For instance, for double dowel joint the most effective dowel distribution equals 96 mm [ 38 , 39 , 40 , 41 , 42 ];…”

Evaluation of corner joint strength of composite panels bonded with modified starch

“…Furthermore, the majority of the openings in the joints are caused by technological mistakes that occur during the gluing processes; the heterogeneous distribution of the glue on the surface is negatively affected by cohesion (Smardzevski 2002, Prekrat et al 2004, Efe and Imirzi 2008, Ulker 2018. Simek et al 2010 examined the effect of end distance of cam fasteners and the number of dowels on bending moment capacity of L type furniture corner joints. Their results indicated a 60mm end distance gave as the highest moment capacity of cam connectors; two cam fasteners with the addition of 2, 3 and 4 unglued dowels were superior in terms of moment capacity.…”