Semiautomatic sliding door device with tension spring
AssigneeNippon Door Check Mfg. Co., Ltd.
InventorEnzo Demukai
Life of this patent
Estimating the term…
Abstract
A semiautomatic sliding door device comprising a sliding door, an outer framework slidably supporting the door for movement between the positions of `open` and `closed` and a driving device comprising a tension spring energizing the sliding door toward the `closed` position, a connecting wire, and a guide wheel for guiding the wire. This device is equipped with a braking device comprising permanent magnets on the outer framework and a braking plate made of copper or aluminum sheets on the sliding door. Coiling said wire around the block in proper manner, the length of elongation of the tension spring can be reduced relative to the stroke of the sliding door.
Claims13
A semiautomatic sliding door device with a tension spring comprising:
- a sliding door,
- a frame structure for slidably guiding the door between the open position and closed position of the door,
- a coiled tension spring carried by one of two elements consisting of the sliding door and the frame structure for urging the door toward the closed position, the spring having its one end fixed to said one of the two elements and its other end connected through a wire to the other of the two elements,
- guide means carried at least by said one of the two elements for guiding the wire, and
- braking means comprising a braking plate of copper or aluminum fixed to the sliding door and a braking magnet unit fixed to the upper frame of the frame structure and having a pair of magnetic surfaces opposed to each other with a clearance and provided by one or two permanent magnets, the magnetic surfaces having an identical row of plural magnetic poles alternately inversely magnetized, every pair of opposed magnetic poles on the magnetic surfaces having opposite polarities, and the braking plate being adapted to pass through the clearance adjacent the closed position of the sliding door.
a semiautomatic sliding door device as defined in claim 15 wherein the tension spring is arranged inside a vertical frame of the frame structure with its one end fixed to the vertical frame and its other end caught through the wire by hook means provided on the upper rail of the sliding door, and the guide means is a guide wheel provided on the upper end portion of said vertical frame of the frame structure.
A semiautomatic sliding door device as defined in claim 15 wherein the tension spring is housed in a cylinder mountable on said one of the two elements and has its one end fixed to one end of the cylinder and its other end connected to a block movable in the cylinder, and the wire, with its one end fixed to the other end of the cylinder, is reeved around the block and extends out from the cylinder through a guide wheel provided at the other end of the cylinder to be connected to the other of the two elements.
A semiautomatic sliding door device as defined in claim 23 wherein connecting means is provided for connecting the spring to said one end of the cylinder or to the block in the form of an externally threaded member with which one end portion of the spring engages.
Dependencies are inferred from the claim text.