Patent Application
20070144865
The present invention relates to a comb plate for a passenger conveyor including an endless conveyor band and a moving flange, having a base plate and a number of teeth arranged on it essentially parallel to one another across the width of the conveyor band, which mesh in use with a cleating or grooves provided on the upper surface of the conveyor band. The present invention further relates to a passenger conveyor having such a comb plate.
A passenger conveyor of this type is known from WO 02,44071 A1, for example.
Comb plates prevent objects, such as clothing, shoes, or bags of passengers from being entrapped at the place where the conveyor belt “disappears” in operation. For this purpose, teeth or prongs are provided, which mesh with corresponding grooves in the step belt. The teeth are bevelled in such a way that move an object carried along with the step band away and thus prevent it from being caught or crushed.
The step band is the area of the passenger conveyor that conveys or moves the passengers. On it, along the exposed surface of the path of movement, the travelling guests are carried along, walking or standing. In an escalator, the conveyor band is called step band. This step band consists of several steps connected to one another by the drive chains which are located at each sides of the step band. In moving side walks, the conveyor band consists of several pallets which are connected to one another by the drive chains as well. Alternatively, with moving walks, the conveyor band may also be formed by an endless band of, for example, reinforced rubber material, or other suitable flexible material.
Comb plates consist for example of diecast tin or cast aluminium and have about 80 teeth in each case, about 2 mm wide and 40 mm long.
Moving flanges, which are also referred to as moving skirt or moving panel, increase security of the conveyor against entrapment due to the relative motion of the conveyor belt and the fixed skirt of conventional conveyors, which skirt is commonly provided laterally adjacent to the conveyor band. While this risk for entrapment has been dealt with by the introduction of the moving flanges, the risk for entrapment still existed at the entry of the steps and moving flange at the exit landing of the conveyor.
It is therefore the object of the present invention to even further improve the safety of passenger conveyors having a moving flange.
According to the present invention, this object is accomplished by a comb plate having a deflector guard which is arranged at the lateral edge of the comb plate and extends a certain height above the upper surface of the comb plate.
The lateral side of the deflector guard is positioned closely to the moving flange so as to deflect any objects or body parts which might come in this critical area next to the moving flange entry. The risk for entrapment of such objects is thus greatly reduced. Typically, the conveyor includes a fixed inner decking which extends over and covers the moving flange. Thus, there is only a portion of the moving flange exposed to the environment while a remaining portion thereof is covered by the inner decking. Preferably, the deflector guard is at least so high that it extends along the exposed portion of the moving flange. More preferred, however, the deflector guard extends also above over a portion of the inner decking. This ensures that the deflector guard exposes a larger surface area to any object facilitating deflection thereof.
Preferably, the deflector includes a nose which protrudes in use below the lower edge of the inner decking towards the moving flange. Such nose is suitable for further reducing the gap between the moving flange and the deflector guard. It is to be noted that there typically is also a gap between the inner decking and the deflector guard. As the deflector guard is attached to the comb plate, it has to be movable therewith. For security reasons, the comb plate is not immovably fixed to the conveyor truss but movable to some extend against a certain force. If for example the comb plate locks with a step, the step will move the comb plate relative to the truss until a security switch will shut off the conveyor and cut off power to the conveyor drive. In order to allow for such a movement, it is necessary that the comb plate and deflector guards can move a certain distance relative to the truss, the inner decking, etc.
Preferably, the deflector guard is integrally formed with the comb plate. This construction is particularly preferred as it allows for a simple and secure attachment thereof to the comb plate and further allows for a cost efficient implementation thereof. Alternatively, the deflector guard may be attached to the comb plate by means of fasteners such as screws or bolts and nuts. This allows for an adjustment thereof in the conveyor and further allows for attaching deflector guards to existing comb plates.
Preferably, the deflector guard tapers laterally outwards in the direction of the comb teeth and towards the free ends thereof. This taper deflects or guides any object away from the moving flange. By providing this nose, it is possible to have essentially the same gap width between the deflector guard and the so moving flange and the deflector guard and the inner decking, respectively. As the inner decking is no moving part, the gap distance between the inner decking and the deflector guard may also be smaller than that between moving flange and deflector guard.
Preferably, a cover is positioned above the deflector guard. While the deflector guard is preferably of the same material as the comb plate, such cover can be of a different material, for example a plastic material, which is cheeper to manufacture. Moreover, as the comb plate is typically fabricated by way of an die cast process, excessively high flanges at the lateral edges thereof complicate such manufacturing process. Moreover, excessively high flanges at the edges thereof are prone for braking, etc. The cover can be attached to the truss, i.e. the inner decking and/or the handrail entry box, which is typically connecting to the inner decking with a slight gap being preferably provided between the deflector guard and the cover, This gap allows for a certain movement of the comb plate and deflector guard in case of an emergency situation as referred to above.
It has to be noted that deflector guards can be provided at each lateral edges of the comb plate. Moreover, such deflector guards can be provided at the entry and exit landings as well as with the upper and lower landings with escalators.
The invention and embodiments of the invention are described in greater detail below with reference to the figures, wherein
In
The inner decking 10 is fixed to a support structure (not shown) for example the escalator truss. It generally consists of a sheet metal material or any other material of sufficient strength. Connected to the inner decking 10 is a handrail entry box 14 which provides the lateral limitation of the entry area 16. A comb plate 18 including a plurality of comb plate segments 20, 22 is provided in the usual way at the entry area of the step band. The comb plate segments 20, 22 each comprises a plurality of teeth 24 co-operating with the grooves 6 on the step belt.
A deflector guard 26 is provided at each lateral edge of the comb plate 18 for deflecting any objects away from the moving flange 8 in the entry area thereof.
A cover 28 covering the deflector guard 26 is attached to the handrail entry box 14 and covers the upper portion of the deflector guard 26. While the deflector guard 26 is preferably made of the same material as the comb plate segments 20, 22 for different reasons, like stability, etc., the cover 28 can be made of a more cost effective material like plastics, etc.
In
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP03/01252 | 2/7/2003 | WO | 11/3/2006 |
