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.

Provided is a small plug door device having a slide base is installed slidably in a vehicle width direction relative to a fixed base. A door drive mechanism for moving one door in a vehicle front-rear direction via a connecting portion has a drive portion including an electric motor, a drive wheel member, a follower wheel member, and an endless member, and is installed on the slide base. A guide portion guides a shaft portion provided on the connecting portion so as to move the shaft portion in a vehicle width direction. In a double-speed rail in which a pinion is disposed between two racks, one rack is connected to the slide base, the other rack is connected to the door side, and the pinion is connected to the connecting portion.

A linear stem (3) guides a sliding door (11), which is dragged by a magnetic drive unit between an operating position (W), in which it covers and closes an access mouth (20) to an internal compartment (21) of a sterilizer (1), and an inoperative or opening (N), in which the door (11) moves to a position next to the access mouth (20), thus making it accessible from the outside.

The sliding door (11) is operated by movement members (5), comprising a linear module (50), adapted to house a transmission belt (52) stretched between two return wheels (53), one of which is driven by an electric gearmotor (54); a branch of the transmission belt (52) carries a slider (55) with a permanent magnet (56), facing a magnetic plate (6) fixed to the sliding door (11) which is dragged by the magnetic field generated by the cursor (55) in motion.

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 cover for attachment to a header of a door system. The cover may have a motor compartment, a pulley compartment, and a first window. The motor compartment may be configured to at least partially enclose a motor and the pulley compartment may be configured to at least partially enclose a pulley, where the motor is operably attached to the pulley to drive a drive member. The first window may be configured to receive a portion of the drive member extending through an exterior wall of the cover.

A lifting and lowering apparatus includes a support plate, a carrier for lifting and lowering a window glass and a drive mechanism for moving the carrier. The drive mechanism includes a cable, a drum, a pulley and a bracket for mounting the pulley to the support plate. The support plate is provided with first and second fixing portions. The first fixing portion is arranged at an outer side of the cable and the second fixing portion is arranged at an inner side of the cable. The bracket includes first and second mounting portions provided for the first and second fixing portions respectively. The first mounting portion includes a first extension portion making contact with an outer surface of the first fixing portion and the second mounting portion includes a second arm portion making contact with an inner surface of the second fixing portion.

A lifting and lowering apparatus includes a support plate, a carrier for lifting and lowering a window glass and a drive mechanism for moving the carrier. The drive mechanism includes a cable, a drum, a pulley and a bracket for mounting the pulley to the support plate. The support plate is provided with first and second fixing portions. The first fixing portion is arranged at an outer side of the cable and the second fixing portion is arranged at an inner side of the cable. The bracket includes first and second mounting portions provided for the first and second fixing portions respectively. The first mounting portion includes a first extension portion making contact with an outer surface of the first fixing portion and the second mounting portion includes a second arm portion making contact with an inner surface of the second fixing portion.

A linear stem (3) guides a sliding door (11), which is dragged by a magnetic drive unit between an operating position (W), in which it covers and closes an access mouth (20) to an internal compartment (21) of a sterilizer (1), and an inoperative or opening (N), in which the door (11) moves to a position next to the access mouth (20), thus making it accessible from the outside. The sliding door (11) is operated by movement members (5), comprising a linear module (50), adapted to house a transmission belt (52) stretched between two return wheels (53), one of which is driven by an electric gearmotor (54); a branch of the transmission belt (52) carries a slider (55) with a permanent magnet (56), facing a magnetic plate (6) fixed to the sliding door (11) which is dragged by the magnetic field generated by the cursor (55) in motion.