Flat T-Type Joints

Flat T-type joints in furniture are used for connecting bearing structure elements of case and skeletal furniture. This group of joints includes single covered mortise and tenon joints, double dowel joints, double through mortise and tenon joints, single covered mortise and tenon joints, single through mortise and tenon joints with a cap, fin lap joints and straight lap joints (Fig. 4.36).

4.6.2.3 Flat X-Type Joints

Flat X-type joints dominate mainly in joinery products. In furniture, they are used occasionally to connect decorative elements of door panels and upholstery frames (Fig. 4.37).

Fig. 4.34 Slant flat L-type joints: a bevel lap joint, (b, c) single bevel mortise and tenon joint, d double bevel mortise and tenon joint, e double bevel dowel joint and f covered bevel mortise and tenon joint

4.6.2.4 Plate Frontal Parallel Joints

Plate frontal parallel joints are used to increase the length of board elements. Joints with dowel connectors or biscuit joints are most commonly used here (Fig. 4.38).

Fig. 4.35 Principles of measuring perpendicular flat L-type joints: a double dowel joint, b single separated mortise and tenon joint, c single semi-covered mortise and tenon joint and d single covered mortise and tenon joint

Fig. 4.36 Perpendicular flat T-type joints: a single covered mortise and tenon joint, b double dowel joint, c double through mortise and tenon joint, d single covered mortise and tenon joint, e single through mortise and tenon joint with a cap, f fin lap joint and g straight lap joint