Abstract:
A maintenance method for an elevator includes provision of a service platform in a lower region of the elevator, in particular a shaft pit, for later maintenance work, wherein the service platform was previously mounted for installation purposes on at least one set of car guide rails and served in the installation process as a working platform for mounting elevator components in the elevator shaft, in particular on a shaft wall.

Description:
FIELD 
     The invention relates to a maintenance method for an elevator, particularly for the maintenance of elevators in high buildings. 
     BACKGROUND 
     By a building of a high constructional height there is to be understood a building from approximately 30 floors and higher. Installation of an elevator is relatively costly in the case of such high buildings. Special methods and devices are often provided for the installation so that the installation can be carried out efficiently in terms of time. 
     US 2010/0133048 A1 shows, for example, an installation method for an elevator in a high building, in which use is made of a movable installation platform. At the start of the installation method the installation platform is positioned in the region of the shaft pit. Elevator components are constantly brought to the elevator installation from where these are mounted in the shaft area. In that case, the installation method provides that the installation platform is moved upwardly into different mounting positions by means of a hoist until the installation platform reaches an uppermost or last mounting position. Finally, the installation platform itself serves at least as a sub-structure of the elevator car. 
     This installation method is thus distinguished not only by an efficient procedure, but also by optimum utilization of the structures already present during the installation, in that the installation platform or at least parts thereof are incorporated into the later elevator car. 
     SUMMARY 
     An object of the present invention can therefore be seen in the extension of the use of an elevator component, which was previously used in an installation method, for later applications in the elevator, particularly also for maintenance applications. 
     The object is fulfilled by a maintenance method with the following step:
         providing a service platform in a lower travel region of the elevator, particularly a shaft pit, for later maintenance operations, wherein the service platform was for installation purposes mounted beforehand on at least one pair of car guide rails and in that case served as work platform for the mounting of elevator components on a structure, particularly a shaft wall, bounding the travel region.       

     The advantage of this maintenance method resides in the fact that a previously used installation platform can also serve as a service platform for maintenance purposes. In particular, the service platform can be used twice. This leads not only to optimized utilization of the service platform itself, but also to an optimized sequence in terms of time of the preceding installation method as well as the maintenance method itself, since the installation platform can be provided for a new use without costly conversion work. 
     It is especially advantageous if the service platform is already guided at car guide rails. The service platform can in that regard be provided in a defined position in a lower travel region of the elevator and sets clear physical boundary conditions for normal operation of the elevator. In addition, the service platform is rapidly available for maintenance work below the elevator car and is safely operable thanks to the reliable guidance at the car guide rails. 
     Further steps of the maintenance method concern suspension of the service platform at the elevator car and movement of the service platform by means of a drive of the elevator car into a maintenance position. In that case it is particularly advantageous that it is possible to have resort to an already available drive for movement of the service platform. 
     A further step of the maintenance method relates to suspension of the service platform at the elevator car by means of at least one connecting element, wherein the connecting element comprises at least one of the following elements: a chain, a cable, a rope, a belt or a tension rod. The service platform can be coupled to the elevator car particularly simply and reliably by means of such a connecting element. In that case, provided not only at the underside of the elevator car, but also at the service platform are connecting points for the connecting element, at which, for example, the connecting element can be hooked, clamped or detented in place or screw-connected. 
     A further step of the maintenance method concerns removal of a roof construction from the service platform prior to providing the service platform in the lower travel region and/or removal of a guide extension from the service platform prior to providing the service platform in the lower travel region. The roof construction offers, during installation, protection from objects falling down and is no longer needed for maintenance work, particularly since the elevator car already offers sufficient protection. The guide extension conducts the guidance forces into a lower region, which is better anchored during installation of the car guide rails, of the already mounted car guide rails. The guide extension is also no longer needed for the maintenance operations. In that case it is advantageous that little space has to be provided for provision of the service platform in the lower travel region. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
       The maintenance method is further explained on the basis of further embodiments and drawings, in which: 
         FIG. 1  shows an elevator shaft with a service platform for installation purposes; 
         FIG. 2  shows the elevator in the elevator shaft of  FIG. 1  with the service platform provided in the shaft pit; 
         FIG. 3  shows the elevator of  FIG. 1  in maintenance operation with the service platform suspended at the elevator car; and 
         FIG. 4  shows an embodiment of the service platform. 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  shows a shaft  1  of a building with a plurality of floors  2 . 1 ,  2 . 2 ,  2 . n , during installation of an elevator. 
     A girder  12  is mounted at the level of the uppermost floor  2 . n  in the upper region  3  of a shaft  1  to protrude at an inclination into the shaft  1 . In that case, a first end, here the left-hand end, of the girder  12  is pivotably mounted on the floor of the uppermost floor  2 . n  and a second end remote therefrom, here the right-hand end, is leant against a side wall of the shaft  1 . 
     The girder  12  has a suspension point for a hoist. This suspension point can be designed as, for example, an eye. The hoist comprises at least one support means or device  13 , such as, for example, a cable, and a drive  14  which is automotively movable along the support means  13 . The support means  13  can be simply mounted at the suspension point of the girder  12  by a hook. 
     In addition, an installation platform  51  is mounted on car guide rails  31  to be movable. The installation platform  51  serves, during installation of the elevator, as a work platform, which is movable along the already mounted car guide rails  31  and from which an engineer mounts elevator components at the region of the shaft  1 . For that purpose the installation platform  51  is connected on its underside with the drive  14 . This connection can be produced, for example, simply and reliably by way of screw connections. In the illustrated embodiment the installation platform  51  comprises three sub-modules, namely a basic platform  52  with a balustrade  53 , which bounds the standing area of the basic platform  52 , a guide extension  55  and roof construction  54 . The guide extension  55  is mountable on the basic platform  52  and conducts guidance forces into a lower, more stable region of the cage car guide rails  31 . This makes it possible to move the service platform  51  to a highest possible work position. Finally, the roof construction  54  offers protection to engineers from objects which are falling down. 
       FIG. 2  shows the finally installed elevator. The elevator comprises at least one elevator car  10  and counterweight  9  for compensation for weight forces. For that purpose the elevator car  10  and the counterweight  9  are each suspended at one end of traction means or device  5  in the suspension ratio 1:1. The traction means  5  runs in the upper region  3  of the shaft  1  at least over a traction pulley  6 , which is operatively connected with the drive  7 , and over a deflecting roller  8 . The elevator car  10  can be moved to the floors  2 . 1 ,  2 . 2 ,  2 . n  by means of the drive  7 . 
     In addition, the installation platform re-functions as the service platform  51  as illustrated in  FIG. 2 . The service platform  51  comprises at least the basic platform  52  and the balustrade  53 . In that regard, the roof construction  54  as well as the guide extension  55  were removed before provision of the service platform  51 . Finally, the service platform  51  is provided in a lower region  4  of the elevator, particularly a shaft pit  4 , for later maintenance work. 
       FIG. 3  shows the service platform  51  as suspended at the elevator car  10  by way of connecting elements  58 . 1 ,  58 . 2 . Chains, cables, ropes, belts or tension rods are suitable as connecting elements  58 . 1 ,  58 . 2 . In order to be able to suspend the service platform  51  at the elevator car  10  in simple and reliable manner, connecting points  11 . 1 ,  11 . 2  and  50 . 1 ,  50 . 2  are arranged both at the underside of the elevator car  10  and at the service platform  51 . A respective connecting element  58 . 1 ,  58 . 2  can be hooked, clamped or detented in place or screw-connected at these connecting points  11 . 1 ,  11 . 2 ,  50 . 1 ,  50 . 2 . For preference, four connecting elements  58 . 1 ,  58 . 2  are provided in the edge region of the service platform  51  so that the service platform  51  offers a secure footing for maintenance engineers. 
     The service platform  51  can now be moved by means of the drive  7  of the elevator car  10  to different maintenance positions in order to service elevator components which are accessible below the elevator car  10  at different levels in the shaft  1 . Thus, for example, guide rails  31 , the counterweight  9 , shaft doors, electrical installations, sensors, etc., can be serviced from the service platform  51 . 
       FIG. 4  shows an embodiment of the service platform  51 . The service platform  51  comprises the basic platform  52  and the balustrade  53 . The roof construction  54  and the guide extension  55 , which have the guide elements  57 , are removed from the installation platform before providing the service platform  51 . Guidance of the service platform  51  at the car guide rails  31  is ensured by the guide elements  56 . The guide elements  56 ,  57  shown here are designed as sliding guide shoes. 
     In accordance with the provisions of the patent statutes, the present invention has been described in what is considered to represent its preferred embodiment. However, it should be noted that the invention can be practiced otherwise than as specifically illustrated and described without departing from its spirit or scope.