The invention relates to a six-panel automatic door of a lift comprising on each side of the entrance opening trio of panels hung on tracks by means of travelling wheels and coupled to a drive, whereas the door of lift comprises four parallel tracks, whereas the two rear pairs of panels are each hung on one track and each panel of the front pair of panels is hung on an independent track.

Six-panel automatic elevator doors currently known include on each side of the entrance opening trio of panels placed one after another and movable towards the opposite trio of panels. In principle, by that three rows of panel pairs moving against each other are made up, as there is in every row one panel placed on each side of the entrance opening. Such six-panel automatic elevator door further includes trio of tracks located in the upper part of the construction, whereas there is a pair of counter-moving panels hung on each track by means of their travelling wheels, and both panels of every pair of panels move within a common plane given by their common track and abutting against each other with their frontal areas in the closed position of the door. The panels are coupled to a drive controlled by the controlling unit of the elevator.

The disadvantage of such arrangements including trio of counter-moving pairs of panels is its real nonutility for entrance openings of lifts narrower than 1400 mm, because for narrow entrance openings of lifts it would be necessary to use narrower panels and in particular shorter tracks with possible shorter mutual distances of the travelling wheels of each panel, resulting in insufficient stiffness of the movable mounting of the panels, or in lower resistance of displacement of the panel when running against an obstacle, for example when a person or an object, such as a pram etc., enters the door during its closing movement. The possible displacement of the panel results in damage of the lift and impossibility of its subsequent use. On the other hand, the advantage of six-panel automatic elevator doors rests in the shorter tracks and thus in the quicker opening of the door etc.

From JP 2002 362865 a six-panel automatic door of a lift is known, said door comprising on each side of the entrance opening of lift a trio panels hung on tracks by means of travelling wheels and coupled to a drive. The lift door comprises four parallel tracks, whereas the two rear pairs of panels are each hung on one track and each panel of the front pair of panels is hung on an independent track.

WO 2006/027411 discloses a solution for a three-panel automatic door of a lift, where each panel travels along an independent track, whereby one track is created on the outer side of the first rail having a C-shaped profile, the second track is created on the inner side of the first rail having a C-shaped profile and the third track is created on the inner side of the second rail having a C-shaped profile.

The goal of the technical solution is to allow safe use of six-panel automatic doors of a lift also for lifts having entrance openings width 1400 mm and narrower, starting from 600 mm.

The goal of the invention is achieved by means of a six-panel automatic door of a lift, the principle of which rests on the fact that two tracks are created on one rail formed as space longitudinal profile in principle of C-shape, whereas on the outer side of the C-shaped profile the first track is created and on the inner side of the C-shaped profile the second track is created.

This solution allows use of longer carrying plates with longer mutual distance of the travelling wheels, by means of which sufficient stiffness of the door system is provided, as well as higher resistance to displacement, reliability etc. Thus the six-panel automatic door of lift can be used also for lifts having entrance openings narrower than 1400 mm or, more accurately, with elevators having entrance openings width from 600 mm.

The invention is schematically represented in the drawings, where Fig. 1 shows a front view of the arrangement of the travelling mechanism of the six-panel automatic door of lift with combined rails, Fig. 2 shows a cross-view of the arrangement of the travelling mechanism of the six-panel automatic door of lift with combined rails and Fig. 3 shows a side-view of the arrangement of the travelling mechanism of the six-panel automatic door of lift with combined rails.

The six-panel automatic door of a lift includes on each side of the entrance opening trio of non-represented panels movable on the travelling mechanism towards the centre of the entrance opening of the lift and back. The individual panels are equipped with a set of travelling wheels 10 and are placed on rails 2 in a way adjustable towards the centre of the entrance opening and back. In the represented example of embodiment the panels are fixed on carrying plates 1, which are equipped with a set of travelling wheels 10 placed on rails 2.

In the exemplary embodiment in Fig. 1 to 3 the six-panel automatic door of a lift includes two parallel rails 2, whereas each rail 2 is equipped with a pair of tracks. In the represented exemplary embodiment the rails 2 are formed as space longitudinal profiles in principle of C-shape, whereas on the outer side of the C-shaped profile the first track 20 is created and on the inner side of the C-shaped profile the second track 21 is created.

The two rear pairs of panels, i.e. of carrying plates 1 = 11, are each hung on a single track, and thus the panels of each of those pairs move directly against each other in one plane.

Each panel, i.e. each carrying plate 1 = 12, the front pair of panels, i.e. the front pair of carrying plates 1 = 12, is hung on an individual track. The front pair of panels thus occupies two tracks.

In the exemplary embodiment represented in Fig. 1 to 3 each front pair of panels, of the carrying plates 1 = 12, is hung on an independent track of a common rail 2, whereas one of the carrying plates 1 = 12 having its end cranked for joining the door panel into the plane of the straight end of the other carrying plate 1 = 12, so that the panels of this front pair of carrying plates 1 = 12 hung on them move in one plane directly against each other. The use of independent tracks for the front pair of carrying plates 1 = 12 allows their travelling wheels 10 to be shifted away from each other farther than with an arrangement using only trio of tracks according to the prior art, by which a sufficient stiffness of the door system is guaranteed, as well as their resistance to displacement, reliability etc., which allows six-panel automatic doors of a lift to be used also for lifts having their entrance openings narrower than 1400 mm, respectively with openings varying from 600 mm to 1400 mm.

In another non-represented exemplary embodiment is the embodiment according to Fig. 1 to 3 modified by merely a modification of the end of one of the carrying plates 1 = 12 of the front pair of panels, so both carrying plates 1 = 12 are straight, so that the panels of this front pair of carrying plates hung on them move in two parallel planes next to each other and can thus overlap each other in the central part of the entrance opening of the lift.

In another non-represented exemplary embodiment the ends of both carrying plates 1 = 12 of the front pair of panels are shaped so that both carrying plates 1 = 12 are bent, thus the panels of this front pair of carrying plates 1 = 12 hung on them move either in two parallel planes next to each other and can overlap each other in the central part of the entrance opening of the lift, or move in a single plane directly against each other.

In another non-represented exemplary embodiment two of the four tracks are formed by independent rails 2 and the remaining two pairs of tracks are formed on a single common rail 2 according to the embodiment in Fig. 1 to 3.

1

carrying plate

10

travelling wheel

11

carrying plate of rear panel

12

carrying plate of front panel

2

rail

20

first track

21

second track