A hidden joining system with front activation for a bottom of a piece of furniture and furnishing items includes a front joining unit and a rear joining unit positioned between a bottom and a shoulder of the furniture, wherein each front and rear joining unit is attached beneath the thickness of the bottom of the furniture, wherein symmetry axes of the two front and rear joining units lie on a plane external and parallel to a center plane of the bottom and the front joining unit has a transmission element toward the rear joining unit.

A system for constructing a piece of furniture, partitions or an exhibition stand, the system including a supporting structure which has a flat shape and has a plurality of side edges, where interfaces embodied and designed for connection to other system components are provided on at least two edges, where at least one adjusting element is interlockingly and/or frictionally attached to the interfaces arranged on the edges and pertaining to the at least one supporting structure, where the interfaces are arranged in the edges of the supporting structure and protected by the supporting structure being at least partially built into the supporting structure and arranged in recesses provided in the side edges, and the at least one adjusting element is attached to the interfaces by means of a mating part to the respective interface resulting in a flexible, modular system with interfaces on the edges of a supporting structure, by means of which all of the functions of a piece of furniture can be covered.

For joining assemblies, an apparatus includes a bracket, planar supports, and a restraining hook. The bracket includes a first bracket plate and a second bracket plate. The first bracket plate is physically connected to the second bracket plate and is disposed at a specified interior angle to the second bracket plate. Each planar support is formed by bending a corresponding bracket plate inward along a support outer bend as a substantially right angle to the bracket plate, with the planar support disposed toward an interior of the bracket. The restraining hook is in physical communication with the second bracket plate. The restraining hook includes a first hook plate disposed substantially perpendicular to the second bracket plate and a second hook plate in physical communication with the first hook plate and disposed substantially parallel to the second bracket plate.

A set of panels including a first panel and a second panel configured to assume a locked state in which a first main plane of the first panel is arranged at an angle of between 30? and 150? relative to a second main plane of the second panel. A separate tongue arranged in an insertion groove of a groove is configured to cooperate with a tongue groove provided in an edge section of the second panel for locking the first and second panels to each other in a first direction perpendicular to the first main plane, and the edge section is configured to cooperate with the groove for locking the first and second panels to each other in a second direction parallel to the first main plane. A bottom portion of the groove includes an elevated portion arranged at least in an outer section of the groove along the second direction, wherein an area of the elevated portion is at least 3% of an area of a rectangular bounded region extending along boundaries of the bottom portion.

A set of panels including a first panel and a second panel configured to assume a locked state. A separate tongue arranged in an insertion groove of a groove is configured to cooperate with a tongue groove provided in an edge section of the second panel for locking the first and second panels to each other in a first direction perpendicular to the first main plane, and the edge section is configured to cooperate with the groove for locking the first and second panels to each other in a second direction parallel to the first main plane. A bottom portion of the groove includes an elevated portion arranged at least in an outer section of the groove along the second direction, wherein an area of the elevated portion is at least 3% of an area of a rectangular bounded region extending along boundaries of the bottom portion.

A set of panels including a first panel and a second panel configured to assume a locked state. A separate tongue arranged in an insertion groove of a groove is configured to cooperate with a tongue groove provided in an edge section of the second panel for locking the first and second panels to each other in a first direction perpendicular to the first main plane, and the edge section is configured to cooperate with the groove for locking the first and second panels to each other in a second direction parallel to the first main plane. A bottom portion of the groove includes an elevated portion arranged at least in an outer section of the groove along the second direction, wherein an area of the elevated portion is at least 3% of an area of a rectangular bounded region extending along boundaries of the bottom portion.

A set of panels including a first panel and a second panel configured to assume a locked state. A separate tongue arranged in an insertion groove of a groove is configured to cooperate with a tongue groove provided in an edge section of the second panel for locking the first and second panels to each other in a first direction perpendicular to the first main plane, and the edge section is configured to cooperate with the groove for locking the first and second panels to each other in a second direction parallel to the first main plane. A bottom portion of the groove includes an elevated portion arranged at least in an outer section of the groove along the second direction, wherein an area of the elevated portion is at least 3% of an area of a rectangular bounded region extending along boundaries of the bottom portion.