Doors bostvig

Doors bostvig are a kind of sliding doors. They are used in mines of elevators, both passenger, and small load-lifting. These double-wing trellised doors consist of vertical levels which, thanks to special rollers or a suspended rail, slide on guides which, in turn, are attached to a threshold.
Doors bostvig in the put state occupy the minimum quantity of space which in direct ratio depends on width of levels. Sometimes doors bostvig are applied in elevators of big loading capacity.