The present invention provides an annular roller device for a sliding window/door, which is proposed as a roller device having a new structure wherein the roller device installed under a door sash can move a sliding window/door having heavy weight, and can maximize the open glass portion of the window/door by minimizing the height of the space required to install the roller device, thereby providing a more open view. The roller device has a structure in which, even when a rail installed on a window frame is not horizontal or the bottom portion of a window is not completely flat, all multiple rolling members, which constitute a ring-shaped rolling unit wound around a load-bearing plate (1220) comprising segment bodies (1221, 1222) rotatably connected to each other by a pivot pin (1225) extending therethrough, form contact points with the rail or the bottom portion, and thus each of the rolling members is prevented from being loaded with excessive weight.

A sliding system enabling furniture doors to slide on a rail mechanism configured on the base of the furniture in order to open horizontally and operating with a special side plastic with a concealed damper.

Improved sliding window or sliding door with a leaf with a leaf frame that is composed of leaf profiles which each comprise two half-shells which are thermally connected to each other by an intermediate thermal insulator, whereby in the leaf frame a rebate is provided for a panel which is supported by one or more glazing bead supports in the rebate and whereby the leaf frame is supported by one or more roller cassettes with rollers, wherein at least one glazing bead support comprises a feed-through section for transmitting the weight of the panel or a part thereof to at least one concerned roller cassette and that this feed-through section extends through a bottom leaf profile of the leaf frame up to a roller cassette.

The present invention provides an annular roller device for a sliding window/door, which is proposed as a roller device having a new structure wherein the roller device installed under a door sash can move a sliding window/door having heavy weight, and can maximize the open glass portion of the window/door by minimizing the height of the space required to install the roller device, thereby providing a more open view. The roller device has a structure in which, even when a rail installed on a window frame is not horizontal or the bottom portion of a window is not completely flat, all multiple rolling members, which constitute a ring-shaped rolling unit wound around a load-bearing plate (1220) comprising segment bodies (1221, 1222) rotatably connected to each other by a pivot pin (1225) extending therethrough, form contact points with the rail or the bottom portion, and thus each of the rolling members is prevented from being loaded with excessive weight.

Improved sliding window or sliding door with a leaf with a leaf frame that is composed of leaf profiles which each comprise two half-shells which are thermally connected to each other by an intermediate thermal insulator, whereby in the leaf frame a rebate is provided for a panel which is supported by one or more glazing bead supports in the rebate and whereby the leaf frame is supported by one or more roller cassettes with rollers, wherein at least one glazing bead support comprises a feed-through section for transmitting the weight of the panel or a part thereof to at least one concerned roller cassette and that this feed-through section extends through a bottom leaf profile of the leaf frame up to a roller cassette.