FIELD OF THE INVENTION

The present invention relates to a travelator as defined in the preamble of claim 1.

BACKGROUND OF THE INVENTION

In prior art, travelators intended for transporting people are known e.g. from patent specifications JP 2003-20181, US 1,689,201, US 2,769,522 and US 3,592,139. In these, the conveyor consists of a large number of adjacent narrow belt loops, several such belt loops being arranged over the width of the conveyor to transport users of the travelator. The conveyor has a number of belt drums arranged parallel to each other, at a distance from each other and transverse to the transport direction of the conveyor. Each belt drum carries a number of belt pulleys placed side by side. In the following, the belt drum at the end of the conveyor is called the first belt drum. Placed next to it is a second belt drum. 'Third belt drum' here refers to one of the following belt drums adjacent to the second belt drum. Further, the conveyor comprises a number of mutually parallel endless belt loops, whose upper portions between the belt drums form the moving conveying surface of the conveyor. The belt loops in the end area of the conveyor comprise a number of first belt loops, which are passed over the first belt drum and the second belt drum. A number of second belt loops are passed over the second belt drum and the third belt drum so that they are interleaved with the first belt loops. From the second belt drum onwards over the length of the conveyor, the mutual arrangement of the belt loops is so implemented that they are interlaced with respect to each other in a comb-like fashion around each belt drum. Each belt loop is passed over two belt pulleys on two successive belt drums. Of each two closely adjacent belt loops on, the same common belt drum that are passed over adjacent belt pulleys, one belt loop is passed over a belt pulley on the previous belt drum adjacent to the common belt drum while the other belt loop adjacent to the aforesaid belt loop is passed over a belt pulley on one of the following belt drums relative to the aforesaid common belt drums. The belt loops may be arranged to transmit power, or the power transmission may be implemented via external power transfer to the belt drums.

A comb plate is provided in the immediate vicinity of the end of the conveyor. The comb plate has a number of teeth substantially parallel to each other and spaced by a distance, the first belt loops being fitted to pass between these teeth. Moreover, the comb plate has an upper surface serving as a fixed step surface. A known solution is to place the comb plate immediately beside the first belt drum. A problem with this solution is that at the end of the conveyor between the first and the second belt drums there are first belts spaced so that between each two adjacent belts there remains a gap of a width at least equal to the belt width. For example, if the distance between belt drums is 150 mm and the belt width is 10 mm, gaps of 10 mm x 150 mm are formed, which may cause harm when foreign objects get into the gaps. In addition, the upper surface of the comb plate is necessarily at a higher level than the conveying surface of the conveyor, so they have between them a threshold that the passenger may trip on.

OBJECT OF THE INVENTION

The object of the present invention is to overcome the above-mentioned drawbacks. A specific object of the invention is to disclose a travelator which is safer than earlier travelators and in which the comb plate can be so arranged that the above-mentioned gaps cause no harm and whose upper surface can be at the same level as the conveying surface of the conveyor, thus minimizing the risk of tripping and falling.

BRIEF DESCRIPTION OF THE INVENTION

The travelator of the invention is characterized by what is disclosed in the characterization part of claim 1. Other embodiments of the invention are characterized by what is disclosed in the other claims. Inventive embodiments are also presented in the description part and drawings of the present application. The inventive content disclosed in the application can also be defined in other ways than is done in the claims below. The inventive content may also consist of several separate inventions, especially if the invention is considered in the light of explicit or implicit sub-tasks or in respect of advantages or sets of advantages achieved. In this case, some of the attributes contained in the claims below may be superfluous from the point of view of separate inventive concepts . Within the framework of the basic concept of the invention, features of different embodiments of the invention can be applied in conjunction with other embodiments.

According to the invention, the upper surface of the first belt drum is at a lower level than the upper surface of the second belt drum so that the upper portions of the first belt loops are at an inclined angle. The comb plate is so disposed on the first belt drum that the teeth of the comb plate extend to a substantially close distance from the second belt loops running over the second belt drum.

In an embodiment of the travelator, the upper surface of the comb plate is substantially at the same level with the conveying surface of the conveyor.

In an embodiment of the travelator, the first axis of rotation of the of the first belt drum is at the same level or at a lower level relative to the level of the second axis of rotation of the second belt drum and the third axis of rotation of the third belt drum.

In an embodiment of the travelator, the diameter of the first belt drum is smaller than the diameter of the second belt drum.

In an embodiment of the travelator, the diameter of the first belt drum is substantially equal to the diameter of the second belt drum.

In an embodiment of the travelator, the end of the conveyor is the entry end or leading end as seen in the transport direction. In this case, the first belt drum is also the first one of the belt drums in the transport direction.

In an embodiment of the travelator, the end of the conveyor is the exit end or tailing end as seen in the transport direction. In this case, the first belt drum is the last one of the belt drum of the conveyor in the transport direction.

LIST OF FIGURES

In the following, the invention will be described in detail with reference to embodiment examples and the attached drawing, wherein Fig. l presents a diagrammatic top view of an embodiment of the end of the conveyor of a travelator according to the invention, and

Fig. 2 presents a cross-section H-II from Fig. 1.

DETAILED DESCRIPTION OF THE INVENTION

Fig. 1 shows the end 6 of the conveyor 1 of the travelator 1. Depending on the transport direction, the conveyor end 6 may be the entry end or leading end, or 311st as well the exit end or trailing end.

The conveyor 1 comprises a number of belt drums 2, 3, 4 rotatably mounted with bearings on the conveyor frame. The belt drums are arranged to be mutually parallel, at a distance from each other and transverse to the transport direction of the conveyor 1. Each belt drum carries a large number of belt pulleys 5. The belt drums visible m Fig. 1 comprise a first belt drum 2 at the end 6 of the conveyor, a second belt drum 3, which is the one next to the first belt drum 2, and a third belt drum 4, which is one of the following belt drums adjacent to the second belt drum.

Although the example illustrations show the second belt loop 8 as passing over two immediately successive belt drums 3 and 4, it is of course possible to provide longer belt loops 8 the passage of which is so arranged that between the belt drums turning the belts around through 180° there are one or more supporting drums over whose belt pulleys the belts run substantially straight without their direction being changed, so these drums are only intended to support the belts from below. Furthermore, the conveyor 1 has a large number of mutually parallel endless belt loops 7, 8, the upper portions of which between belt drums 2 and 3, and 3 and 4, form a conveying surface 9. The belt loops comprise a number of first belt loops 7, which are passed over the first belt drum 2 and the second belt drum 3. In addition, the belt loops comprise a number of second belt loops 8, which are passed over the second belt drum 3 and the third belt drum 4 so that they are interleaved with the first belt loops 7.

The conveyor further comprises a comb plate 10 arranged in the immediate vicinity of the end 6 of the conveyor and having a number of teeth 11 substantially parallel to each other and spaced by a distance, the first belt loops 7 being fitted to pass between these teeth. The comb plate 10 is designed to prevent dirt, passengers' limbs and other objects from getting into the gaps between the moving belts and the fixed structures. The comb plate 10 has an upper surface 12 that the passenger can step on.

Fig. 2 shows that the upper surface of the first belt drum 2 is at a lower level than the upper surface of the second belt drum 3 , so the upper portions of the first belt loops 7 are at an inclined angle α relative to the horizontal plane. This allows the comb plate 10 to be extended over the first belt drum 2 so that the teeth 11 of the comb plate 10 extend substantially close to the second belt loops 8 running over the second belt drum 3. This makes it possible for the upper surface 12 of the comb plate 10 to be disposed substantially at the same level with the conveying surface 9 of the conveyor 1. The diameter Dl of the first belt drum 2 is smaller than the diameter D2 of the second belt drum 3. The first axis of rotation 13 of the first belt drum 2 is at a somewhat lower level relative to plane T, which is the plane at which the second axis of rotation 14 of the second belt drum 3 and the third axis of rotation 15 of the third belt drum 4 are located.

In another embodiment the diameter Dl of the first belt drum 2 may also be substantially equal to the diameter D2 of the second belt drum 3. In this case, the first belt drum 2 may be placed at a level still lower at a distance below plane T so that the upper portion of the first belt loop 7 will be placed at an inclined angle α.

The invention is not limited to the embodiment examples described above; instead, many variations are possible within the scope of the inventive concept defined in the claims. LIST OF REFERENCE NUMBERS:

conveyor (1) first belt drum (2) second belt drum (3) third belt drum (4) belt pulley (5) end (6) of conveyor first belt loop (7) second belt loop (8) conveying surface (9) comb plate (10) tooth (11) upper surface (12) angle (α)