Patent Application
20190218070
The invention relates to a moving walkway, in particular to a belt driven moving walkway.
Moving walkways usually comprise a plurality of pallets connected to each other by at least one chain forming an endless conveyance band. The pallets move along an upper conveyance portion and a lower return portion. In turnaround portions established at the ends of the moving walkway, the pallets are transferred from the conveyance portion into the return portion and vice versa. Additional space is needed at the ends of the moving walkway for establishing the turnaround portions.
It would be beneficial to provide an improved moving walkway which needs less space without deteriorating the safety of operating the moving walkway.
A moving walkway according to an exemplary embodiment of the invention comprises at least one endless belt moving in a conveyance direction along a closed loop. The closed loop comprises a conveyance portion and a return portion extending between two turnaround portions, respectively. The moving walkway further comprises a plurality of pallets. Each of the pallets has at least one mounting portion rotatably attached to the at least one belt, and at least one mechanical connection connecting the pallet with the at least one mounting portion of an adjacent pallet.
In a moving walkway according to an exemplary embodiment of the invention, using at least one belt for driving the pallets allows reducing the space needed for establishing the turnaround portions. The pallets are connected to each other independent of the at least one belt by the mechanical connections, thus forming an endless conveyance band without the aid of the at least one belt. Thus, the conveyance band of pallets remains intact even in case of a failure of the at least one belt, e.g. in case the at least one belt should break. In consequence, a moving walkway according to an exemplary embodiment of the invention may be operated safely as no wide gaps, in which extremities (hands or legs) of passengers could be trapped, will open between adjacent pallets on the running moving walkway, even in case the at least one belt should brake.
A number of optional features are set out in the following. These features may be realized in particular embodiments, alone or in combination with any of the other features.
The at least one mechanical connection may be provided by at least one connection portion, in particular by at least one connection portion formed integrally with the pallet. Providing the at least one mechanical connection by a connection portion reduces the number of elements of the moving walkway. In consequence, the costs of manufacture and assembly may be reduced.
For attaching the pallet to the belt, the at least one mounting portion may comprise at least one linkage axle or pin rotatably mounted to the at least one belt. Each mounting portion may comprise a single linkage axle (pin) or two linkage axles (pins) extending coaxially with each other.
The at least one linkage axle or pin may extend rotatably through a hole formed within the connection portion of an adjacent pallet forming a rotatable mechanical connection between two adjacent pallets.
The at least one hole may be an elongated hole allowing the at least one linkage or pin not only to rotate within the hole, but also to slide along the longitudinal extension of the elongated hole. Forming the hole as an elongated hole adds an additional degree of freedom to the connection between two adjacent pallets.
The longitudinal extension of the elongated hole in particular may extend parallel to the at least one belt in order to allow varying the distance between two adjacent pallets in a direction parallel to the extension of the at least one belt. Such a variation of the distance allows reducing the space needed for transferring the pallets between the conveyance portion and the return portion in the turnaround portions. As a result, the diameter of the turnaround portions and in consequence the height of the moving walkway may be reduced.
Webs may be attached to the at least one belt. The linkage axles or pins of the pallets may be attached to the webs for attaching the pallets to the at least one belt.
In one configuration, the linkage axles or pins may be non-rotatably fixed to the pallets and rotatably supported by the webs for rotatably attaching the pallets to the at least one belt.
In an alternative configuration, the linkage axles or pins may be rotatably fixed to the pallets and non-rotatably supported by the webs.
In yet another configuration, the linkage axles or pins may be nonrotatably but only slidable within the elongated hole of the adjacent pallet. In said configuration, the linkage axles are rotatably fixed to the pallets and rotatably supported by the webs.
The webs may be attached to the at least one belt at positions corresponding to a portion of the at least one belt which is neither compressed nor stretched when the belt is bent in the turnaround portions. In such a configuration, the stress exerted onto the belt is reduced prolonging the lifetime of the belt.
The at least one belt may be arranged below the pallets in the conveying portion. Similarly, the at least one belt may be arranged above the pallets in the return portion. Arranging the least one belt above/below the pallets allows reducing the space needed in the lateral direction, i.e. in a direction oriented orthogonally to the conveyance direction.
The moving walkway may comprise pallet rollers attached to the pallets. The moving walkway may further comprise guide rails configured for guiding and supporting the pallet rollers in order to support the load of the pallets and of passengers standing on the pallets.
The pallet rollers may travel through the turnaround portions without being supported by any guide rails. This avoids installing curved guide rails in the turnaround portions. Curved guide rails are more complicated to produce, install and adjust for a noise and vibration less operation and low wearing than straight guide rails. Thus, the fabrication and installation of the moving walkway is simplified when no curved guide rails are needed.
In an alternative configuration, the pallet rollers may be guided through the turnaround portions by arcuate guide rails, in particular by guide rails extending along a circular arc in order to reduce the forces, in particular centrifugal forces, acting onto the belt.
Each of the pallets may be supported by at least two pallet rollers for distributing the load acting onto the pallet rollers. In such a configuration the at least one belt may be arranged between the at least two pallet rollers. This allows for easy access to the rollers and results in a high stability with respect to tilting, in particular when passengers stand on the lateral side portions of the pallets. It further enhances the directional stability of the movement of the pallets in the lateral direction.
The moving walkway may comprise at least two belts extending parallel to each other, wherein each pallet is attached to each of the belts. Employing a plurality of belts reduces the forces acting on each of the belts. It further provides redundancy so that the moving walkway may be operated at least in an emergency operation mode, e.g. with reduced speed, in case one of the belts should break.
In such a configuration the pallet rollers may be arranged between the at least two belts. The at least two pallet rollers in particular may be arranged coaxially with each other. In a configuration in which the pallet rollers are arranged coaxially between the belts, a common axle may be used for supporting at the least two pallet rollers. Further, in such a configuration, a high stiffness/rigidity may be achieved without increasing the weight of the pallets.
In the following exemplary embodiments of the invention are described with reference to the enclosed figures.
The moving walkway 1 comprises an endless conveyance band 10 including a plurality of conveying elements (pallets) 20 moving in a closed loop along an upper conveyance portion 16 and a lower return portion 18. First and second turnaround portions 5, 7, are provided at both ends of the moving walkway 1. In the turnaround portions 5, 7, the conveyance band 10 passes from the conveyance portion 16 into the return portion 18, and vice versa.
Optionally balustrades 4 supporting moving handrails 6 extend parallel to the conveyance portion 16.
The details of the conveyance band 10 as it is employed in a moving walkway 1 according to an exemplary embodiment of the invention are discussed in the following with reference to
In order to enhance the clarity of the figures, not all of the plurality of identical features are denoted with reference signs in
The conveyance band 10 depicted in
The sprockets 14a, 14b are configured for transferring the belt 12 between the conveyance portion 16 and the return portion 18. The belt 12 may have a width of 100 mm to 200 mm, in particular a width of 125 mm to 175 mm, more particularly a width of 150 mm in the lateral direction.
The teeth of the belt 12 engage with the sprockets 14a, 14b. At least one of the sprockets 14a, 14b is driven by a drive mechanism (not shown) for driving the belt 12. In an alternative embodiment, a diverter wheel (not shown) may be used instead of one of the sprockets 14a, 14b.
The conveyance band 10 further comprises a plurality of pallets 20 attached to the belt 12. Each of the pallets 20 comprises a tread plate 19 for supporting passengers using the moving walkway 1.
As visible in
Each pallet 20 is attached to both belts 12. The attachment of the pallets 20 to the belts 12 is identical for both belts 12. Thus, in the following the attachment of the pallets 20 is described with respect to only one of the belts 12.
Each pallet 20 comprises at least one mounting portion 20a, 20b and at least one connection portion 21. The mounting portions 20a, 20b are shown on the left side of the pallet 20 depicted in
As illustrated in
Each pallet 20 further comprises a connection portion 21 arranged laterally outside of the belt 12.
In an alternative embodiment, which is not shown in the figures, the pallets 20 may comprise an additional connection portion 21 corresponding to the inner mounting portion 20b provided laterally inside of the belt 12.
Each of the mounting portions 20a, 20b and the connection portions 21 comprises two lugs extending parallel to each other forming a gap in between.
A plurality of webs 23 are provided on the non-toothed outer surface of the belt 12. The webs 23 may be attached to the belt 12 by an adhesive and/or by appropriate fixing elements such as bolts or screws extending into or through the belt 12. Alternatively, the webs 23 may be formed integrally with the belt 12.
Outer and inner linkage axles (or pins) 22a, 22b extending through the mounting portions 20a, 20b of the pallets 20 are rotatably supported by the webs 23 (see
Elongated holes 26 are formed in the connection portions 21. The longitudinal extension of the elongated holes 26 is oriented parallel to the extension of the belt 12. The outer linkage axles 22a of each pallet 20 extend through the elongated holes 26 formed within the connection portion 21 of an adjacent pallet 20. Thus, the inner linkage axles 22b attach each pallet 20 to the belt 12, and the outer linkage axles 22a connect each pallet 20 with the belt 12 and with an adjacent pallet 20.
The outer linkage axles 22a are rotatable and slidable within the elongated holes 26 providing two degrees of freedom between two adjacent pallets 20.
According to exemplary embodiments of the invention, the pallets 20 are connected with each other independently of the belt 12 forming an endless chain of pallets 20. Thus, although all pallets 20 are individually attached to the belt 12, the belt 12 is not necessary for maintaining a secure connection between the pallets 20. In consequence, the chain of pallets 20 remains intact even in case the belt 12 should brake. This feature enhances the safety of the moving walkway 1.
Each pallet 20 further is equipped with at least one pallet roller 28 rotatably supported by an outer linkage axle 22b. In the embodiment depicted in
The pallet rollers 28 may have a diameter d (see
The guide rails 30, 32 do not extend into the turnaround portions 5, 7, at least not to such an extent as to guide the pallet rollers 28 around the turnaround portions 5, 7.
Thus, in the turnaround portions 5, 7 the conveyance band 10 is guided only by the engagement of the belt 12 with the respective sprocket 14.
The moving walkway 1 illustrated in the figures in particular does not comprise any curved guide rails for guiding the pallet rollers 28 around the curved turnaround portions 5, 7. Curved guide rails are more difficult to handle than straight guide rails. Thus, not employing curved guide rails facilitates the installation of the moving walkway 1, as no curved guide rails need be manufactured, transported, installed, and aligned. Guiding the rollers 30 along curved guide rails further would generate additional noise during operation.
The additional degree of freedom provided by the elongated holes 26 allows for a small diameter D (cf.
In the embodiment depicted in
In the embodiment shown in
The depicted configuration allows reducing the total width of the conveyance band 10 compared to a configuration in which the belts 12, the linkage axles 22, 22a, 22b and/or the pallet rollers 28 are arranged laterally to the pallets 20.
In the embodiments shown in the figures, the pallet rollers 28 are arranged outside the two belts 20 in the lateral direction.
In an alternative embodiment, which is not shown in the figures, the pallet rollers 28 may arranged between the two belts 12 in the lateral direction.
Although the exemplary embodiments illustrated in the figures comprise two belts 12 extending parallel to each other, the skilled person will understand that the principles of the invention may be applied equally to moving walkways 1 comprising only one belt 12 or more than two belts 12.
Similarly, more than two pallet rollers 28 may be attached to each of the pallets 20 in order to reduce the load acting on each of the pallet rollers 28. Additional pallet rollers 28 in particular may be supported by the inner linkage axles 22b or an inner end portion of the linkage axles 22.
While the invention has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adopt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention is not limited to the particular embodiments disclosed, but that the invention include all embodiments falling within the scope of the claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 18151576.8 | Jan 2018 | EP | regional |
| 18171528.5 | May 2018 | EP | regional |
