Patent Publication Number: US-11396442-B2

Title: Low cost roped jump lift concept

Description:
FOREIGN PRIORITY 
     This application claims priority to Chinese Patent Application No. 202010385859.4, filed May 9, 2020, and all the benefits accruing therefrom under 35 U.S.C. § 119, the contents of which in its entirety are herein incorporated by reference. 
     FIELD OF THE INVENTION 
     The invention pertains to the technical field of elevator, and relates to a jumping elevator system and a jumping method used in a construction process of a building. 
     BACKGROUND OF THE INVENTION 
     In a construction process of a building, materials and/or workers need to be conveyed up and down between floors basically built well. Under such need, a jumping elevator (or referred to as jumping lift) system is typically used in the construction process of the building; with an elevator car of the jumping elevator system traveling up and down in a well-built hoistway (or referred to as a lift shaft) of the building, materials and/or workers can be conveniently conveyed between different landings. Also, as the construction process of the building advances continuously, the height or level of the hoistway also advances gradually, and the traveling height of the elevator car of the jumping elevator system in the hoistway also needs to be increased continuously, generally through a jumping platform. 
     Known conventional elevator systems typically use ropes for lifting, and generally require an elevator machine room to be provided to accommodate drives such as tractor to pull the ropes, thereby lifting the elevator car. Therefore, corresponding space is leaved generally in the hoistway (e.g., at the top of the hoistway) of the building to provide the elevator machine rooms. 
     For a jumping elevator system, an elevator machine room also needs to be provided to contain a tractor and the like. At present, the elevator machine room of the jumping elevator system is generally arranged in a hoist, and even the elevator machine room is arranged on a jumping platform and can jump along with the jumping platform. 
     Moreover, before the jumping platform jumps up, guide rails need to be extended and newly extended guide rails need to be positioned and mounted on the hoistway, thereby preparing for extending traveling height of elevator car. 
     SUMMARY OF THE INVENTION 
     According to an aspect of the disclosure, a jumping method of a jumping elevator system centrifugal compressor is provided and comprises: preliminarily positioning and mounting, by means of a temporary working platform at a first height, a guide rail on the hoistway substantially corresponding to the first height; removing the temporary working platform from the position, corresponding to the first height, of the hoistway; lifting, by use of a lifting assembly, a jumping platform from a second height to a third height, wherein the third height is greater than the second height and less than or equal to the first height; and lifting, by use of the lifting assembly, the elevator car to extend its traveling distance in the hoistway, and operating, during lifting of the elevator car, on the top of the elevator car for reinforcing the mount of the guide rail 
     In accordance with an additional or alternative embodiment, the method further comprises: positioning and mounting, prior to the preliminary positioning and mounting of the guide rail, the temporary working platform on a landing corresponding to the first height by a first upright. 
     In accordance with an additional or alternative embodiment, the method further comprises: reloading, prior to lifting the elevator car, the lifting assembly on the elevator car from the jumping platform. 
     In accordance with an additional or alternative embodiment, the method further comprises: fixing, prior to lifting the jumping platform, the elevator car to the guide rail below the second height; and releasing, prior to lifting the elevator car, the fixation of the elevator car relative to the guide rail. 
     In accordance with an additional or alternative embodiment, the method further comprises: fixing, prior to lifting the jumping platform, a counterweight in the hoistway; and releasing the fixation of the counterweight after lifting the elevator car. 
     According to another aspect of the disclosure, a jumping elevator system used in a construction process of a building is provided and includes: an elevator car capable of traveling up and down along a guide rail in a hoistway of the building; a counterweight disposed in the hoistway; a jumping platform capable of jumping along with an increase of height of the hoistway; an elevator machine room which is independently arranged relative to the jumping platform and is incapable of jumping along with the jumping platform; a temporary working platform which is independently arranged relative to the jumping platform and is provided for preliminarily positioning and mounting the guide rail relative to the hoistway prior to lifting the jumping platform; and a lifting assembly provided for lifting the jumping platform to a higher height when the height of the hoistway is increased, and further lifting the elevator car after lifting the jumping platform so as to extend its traveling distance in the hoistway 
     In accordance with an additional or alternative embodiment, the elevator machine room is fixed on a landing outside of the hoistway; the jumping elevator system further includes a pulley assembly which at least comprises a rope, a top guide sheave and a bottom guide sheave; wherein the top guide sheave is arranged on the jumping platform and is capable of jumping along with the jumping platform, the top guide sheave and the bottom guide sheave are arranged to guide the rope to extend at least from the hoistway toward a traction sheave in the elevator machine room outside of the hoistway. 
     In accordance with an additional or alternative embodiment, the top guide sheave and the bottom guide sheave are further arranged to guide the rope to extend at least from a top of the elevator car in the hoistway toward the traction sheave in the elevator machine room outside of the hoistway such that a tractor can transmit a traction force to the top of the elevator car through the pulley assembly. 
     In accordance with an additional or alternative embodiment, the pulley assembly further comprises a roof pulley provided at the top of the elevator car; the top guide sheave and the bottom guide sheave are further arranged to guide the rope to extend at least from the roof pulley toward the traction sheave in the elevator machine room outside of the hoistway such that the tractor can transmit a traction force to the top of the elevator car through the pulley assembly. 
     In accordance with an additional or alternative embodiment, a first end of the rope is secured to the jumping platform, the rope extends downwards from the first end, wraps through the roof pulley, extends upwards and wraps through a first top guide sheave of the top guide sheave, extends downwards and wraps through a first bottom guide sheave of the bottom guide sheave and continues to extend to the traction sheave of the elevator machine room; after wrapping through the traction sheave, the rope then extends laterally and wraps through a second bottom guide sheave in the bottom guide sheave, extends upwards and wraps through a second top guide sheave of the top guide sheave, and continues to extend downwards to the counterweight. 
     In accordance with an additional or alternative embodiment, the number of the first top guide sheaves is two and they are arranged laterally on the jumping platform, the number of the first bottom guide sheaves/the second bottom guide sheaves is two and they are arranged substantially laterally. 
     In accordance with an additional or alternative embodiment, a first end of the rope is secured at the top of the elevator car, the rope extends upwards from the first end, wraps through a first top guide sheave of the top guide sheave, extends downwards and wraps through a first bottom guide sheave of the bottom guide sheave, and continues to extend to the traction sheave in the elevator machine room; after wrapping through the traction sheave, the rope then extends laterally and wraps through a second bottom guide sheave of the bottom guide sheave, extends upwards and wraps through a second top guide sheave of the top guide sheave, and continues to extend downwards to the counterweight. 
     In accordance with an additional or alternative embodiment, the jumping platform comprises a second upright and a cable-stayed member, wherein the second upright is removably positioned and mounted relative to a landing, an end of the jumping platform proximate to a lower end of the second upright is removably mounted on the landing, two ends of the cable-stayed member are pivotally connected to the upper end of the second upright and the jumping platform respectively. 
     In accordance with an additional or alternative embodiment, a fixing member is provided corresponding to the elevator car for fixing the elevator car to the guide rail during lifting of the jumping platform. 
     In accordance with an additional or alternative embodiment, the lifting assembly comprises: a suspension beam; a hoist detachably installed on the jumping platform or the elevator car; a diverting pulley mounted on the suspension beam; and a hoisting member extending from the hoist, wrapping through the diverting pulley, and extending onto the jumping platform or the elevator car. 
     In accordance with an additional or alternative embodiment, the hoist is a cable climber. 
     In accordance with an additional or alternative embodiment, the temporary working platform is positioned and mounted on a respective landing. 
     In accordance with an additional or alternative embodiment, rope compensation is provided from a first end of the rope during lifting of the elevator car. 
     In accordance with an additional or alternative embodiment, the traction ratio of the jumping elevator system is 2:1 or 1:1. 
     The above features, operations and advantages of the present invention will become more obvious from the following descriptions and drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other objects and advantages of the present invention will become clearer and more complete from the following detailed descriptions given in conjunction with the drawings, wherein the same or similar elements are denoted by the same reference sign. 
         FIG. 1  is a structural schematic of a jumping elevator system according to an embodiment of the present invention. 
         FIG. 2  is a structural schematic of a jumping elevator system according to another embodiment of the present invention. 
         FIG. 3  is a flowchart of a jumping method of a jumping elevator system according to an embodiment of the present invention. 
         FIG. 4  to  FIG. 9  illustrate a jumping process of the jumping elevator system of the embodiment shown in  FIG. 1  based on the jumping method of the embodiment shown in  FIG. 3 . 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS OF THE INVENTION 
     The present invention is described more fully hereinafter by reference to the accompanying drawings, in which illustrative embodiments of the invention are illustrated. The invention can, however, be realized in different embodiments and should not be construed as limited to the various embodiments set forth herein. The above-described embodiments are presented in order to provide a thorough and complete disclosure herein and thus achieve a more complete and accurate understanding of the protection scope of the present invention. 
     Terms such as “comprising” and “including” mean that subject matter of present invention does not exclude cases where there are other components not directly or explicitly recited, in addition to having components that are directly and explicitly recited in specification and claims. 
     In the following depiction, when it is alleged that a component is “fixed/secured” to another component, it may be directly fixed/secured to another component or may be indirectly fixed/secured to another component through an intermediate component. On the contrary, when it is alleged that a component is “directly fixed/secured” to another component, an intermediate component does not exist. 
     In the following depiction, the direction corresponding to “up-down direction” corresponds to the direction of the hoist, the direction corresponding to “left-right direction” or “lateral direction” is a direction approximately directing from a landing toward interior of the hoistway. It is to be understood that these directional terms are relative concepts, which are used to describe and clarify a relative position. 
       FIG. 1  shows a structural schematic of a jumping elevator system in accordance with an embodiment of the present invention;  FIG. 4  to  FIG. 9  illustrate a jumping process of the jumping elevator system of the embodiment shown in  FIG. 1  based on the jumping method of the embodiment shown in  FIG. 3 . The jumping elevator system illustrated in  FIG. 1  and its jumping principle are described below in connection with  FIGS. 1, 4-9 . 
     As shown in  FIG. 1 , a jumping elevator system  10  can be used during construction process of a building, for example, materials and/or workers can be conveyed by an elevator car  110 . The hoistway  910  corresponds to a hoistway of a building in a construction process; as the construction process advances, the height of an well-built hoistway  910  as shown in  FIG. 1  will continue to increase, which requires the jump elevator system  10  to perform a jumping operation (or referred to as a climbing operation) in order to enable the jump elevator system  10  to serve a higher landing.  FIG. 1  has shown a part of the well-built landings  920 , e.g., landing  920   1 , . . . , landing  920   N , landing  920   N+1 , landing  920   N+2 , etc.; it will be understood that the subscript of sign  920  corresponds to floor number at which the landing is located, and the particular number of floors of a building is not limiting. 
     With reference to  FIGS. 1 and 5 , the jumping elevator system  10  can include the elevator car  110 , a counterweight  120  disposed in the hoistway  910 , an elevator machine room  130 , a jumping platform  150 , a lifting assembly, and a temporary working platform  160  (as shown in  FIG. 5 ), optionally further includes a pulley assembly, etc. Therein, by means of the lifting assembly, the jumping platform  150  can jump as the height or level of the well-built hoistway  910  of the building increases. 
     Wherein the elevator machine room  130  is independently arranged relative to the jumping platform  150  and does not jump along with the jumping platform  150 . The elevator machine room  130  can be provided with a tractor (not shown in the figures) and a traction sheave  131 , and can also be provided with electrical equipment such as a control cabinet. In consideration that the elevator machine room  130  has a critical environmental requirement but it is difficult to provide a safe and dry environment (e.g., the bottom of the hoistway  910  prone to water accumulation, etc.) for the hoistway  910  of a building not constructed well, the elevator machine room  130  is moved outside of the hoistway  910  in embodiments of the present invention, for example, the elevator machine room  130  is fixed to the landing  920  outside of the hoistway  910 ; thus the elevator machine room  130  also does not need to be lifted by the lifting assembly or the like and also does not jump along with the jumping platform  150 . The floor number of the landing  920  to which the elevator machine room  130  is fixed is not limiting, and the elevator machine room  130  may, but is not limited to, be fixedly disposed on the landing  920   1 , e.g., may also be fixed on other landing  920  as desired. 
     The elevator machine room  130  may be fixedly mounted as a temporary elevator machine room on, for example, the landing  920   1 ; in an embodiment, the temporary elevator machine room can be removed, and then be transferred and installed to a predetermined location in the hoistway  910  (e.g., the top of the hoistway  910 ) for installation after completing the construction of the building, so as to transform the jumping elevator system  10  of the embodiment of the invention into a conventional elevator system normally used in an well-built building, which can realize the recycling of components (such as a tractor and the like) of the elevator machine room  130 , and the cost is greatly reduced for a constructor of the building; moreover, it is also very convenient for operations of transferring and installing the elevator machine room  130  on the landing  920 . The elevator machine room  130  can be selectively disposed adjacent to the hoistway  910 , which will reduce the difficulty of arranging the pulley assembly of the following embodiments and also facilitate reducing traction power requirement on the tractor. 
     Therein, the elevator car  110  can travel up and down along the guide rail  930  in the well-built hoistway  910  of the building under a traction, for example, of the traction sheave  131 . It should be noted that the guide rail  930  is a basic component for supporting the elevator car  110  to travel in the hoistway  910 ; thus, if it is desired that the elevator car  110  could travel to certain height, such as landing  920   N+1 , the guide rail  930  in the hoistway  910  should be positioned and mounted to at least landing  920   N+1  or above the landing  920   N+1 .  FIGS. 4-9  also illustrate a positioning and mounting process of the guide rail  930  in the hoistway  910 , where  930   a  denotes an well-mounted guide rail, and  930   b  denotes a guide rail to be mounted. In an embodiment, the mounting of the guide rail  930  may be reinforced sectionally (e.g., secured to a wall of the hoistway  910 ) on the hoistway  910  using a plurality of guide rail brackets  931 , where  931   a  denotes the guide rail bracket applied on the well-mounted guide rail  930   a , and  931   b  denotes the guide rail bracket applied on the guide rail  930   b  to be mounted correspondingly. 
     With continued reference to  FIG. 1 , the pulley assembly can transmit traction from the traction sheave  131  to the elevator car  110  or counterweight  120 , which may include a rope  141 , one or more top guide sheaves  143 , and one or more bottom guide sheaves  144 . 
     The rope  141  may be various types of traction member (e.g., banded rope) adaptable for elevator systems, whose cross-sectional shape may be generally circular, square, etc., and the materials used of which are not limiting. The rope  141  has two ends, i.e., a first end  1411  and a second end  1412 , which are both secured to the jumping platform  150  (e.g., secured to a spandrel girder of the jumping platform  150 ) in the embodiment shown in  FIG. 1  so that it can jump along with the jumping platform  150 . 
     With continued reference to  FIG. 1 , one or more top guide sheaves  143  are disposed on the jumping platform  150  and capable of jumping along with the jumping platform  150 , and the bottom guide sheaves  144  are disposed corresponding to the elevator machine room  130 , which can be partially disposed in the hoistway  910 , or can be partially disposed outside of the hoistway  910  (e.g., even the bottom guide sheave  144   b  is disposed in the elevator machine room  130 ). The top guide sheaves  143  and the bottom guide sheaves  144  are arranged to guide the rope  141  to extend at least from the hoistway  910  to the traction sheave  131  in the elevator machine room  130  outside of the hoistway  910 , such that the elevator machine room  130  can be fixed to a certain landing  920  outside of the hoistway  910 , without limitation of fixing in the hoistway  910 , improving the flexibility of the arrangement of the elevator machine room  130 , and conveniently introducing traction from the traction sheave  131  outside of hoistway  910  to equipment in hoistway  910  (e.g. elevator car  110  or counterweight  120 ). 
     In an embodiment, the arrangement of the top guide sheaves  143  and the bottom guide sheaves  144  as well as the winding of the rope  141  can be selected to achieve a traction ratio (or referred to as a suspension ratio) of 2:1, for example, a roof pulley  142  can also be provided at the top of the elevator car  110  and a diverting sheave  145  can be provided at the top of the counterweight  120 ; the top guide sheaves  143  and the bottom guide sheaves  144  are further arranged to guide the rope  141  to extend at least from the roof pulley  142  toward the traction sheave  131  in the elevator machine room  130  outside of the hoistway  910  such that the tractor can transmit a traction force to the top of the elevator car  110  through the pulley assembly. In this way, it can achieve a traction ratio of 2:1 for lifting the elevator car  110  from the top of the elevator car  110 . 
     Referring to  FIG. 1 , a specific arrangement of the pulley assembly is presented by way of example in detail. A rope  141  extends downward from the first end  1411 , wraps through the roof pulley  142 , extends upwards and wraps through the first top guide sheave  143   a  of the top guide sheave  143 , extends downwards and wraps through the first bottom guide sheave  144   a  of the bottom guide sheave  144 , and continues to extend to the traction sheave  131  of the elevator machine room  130 ; after wrapping through the traction sheave  131 , the rope the rope  141  extends laterally and wraps through the second bottom guide sheave  144   b  of the bottom guide sheave  144 , extends upwards and wraps through the second top guide sheave  143   b  of the top guide sheave  143 , and continues to extend downwards to the diverting sheave  145  at the top of the counterweight  120 , and finally extends upwards and is secured at the second end  1412 . 
     In an embodiment, there may be two first top guide sheaves  143   a  and they are arranged laterally on the jumping platform  150 , thereby guiding the rope  141  in a left-right direction to guide in a direction toward the elevator machine room  130 ; the first bottom guide sheave  144   a  may be one and it can be disposed in the hoistway  910  and proximate to the elevator machine room  130 ; the second bottom guide sheaves  144   b  may be two and arranged approximately laterally, one of which may be disposed in the elevator machine room  130  and the other which is disposed in the hoistway  910 , thereby guiding the rope  141  in a left-right direction to guide in a direction toward the hoistway  910 . 
     It should be noted that the pulley assembly may achieve the traction ratio of 2:1 in other arrangements. By way of example, the diverting sheave  145  may also be not provided on the counterweight  120  of  FIG. 1 , as shown in  FIG. 2 , with the second end  1412  of the rope  141  secured to the counterweight  120 , such that an arrangement of the elevator car with a roof pulley and the counterweight without a sheave is achieved. 
     Still referring to  FIG. 1 , the jumping platform  150  may be removably fixed at a landing (e.g., landing  920   N ); when the jumping operation is not needed, the jumping platform  150  is fixed at the landing  920   N , thereby providing suspension support for the elevator car  110 , the counterweight  120  and the like; when the jumping operation is needed, its fixation relative to the landing  920   N  is dismounted, thereby preparing for jumping to other landing. 
     In an embodiment, the jumping platform  150  includes a second upright  159  and a cable-stayed member  158 , and the second upright  159  and the cable-stayed member  158  are deposed for conveniently and removably fixing the jumping platform  150  at certain landing; wherein the second upright  159  is removably positioned and mounted relative to the landing  920   N  (e.g., stuck at a landing door gate of the landing  920   N  in up and down direction), the end of jumping platform  150 , close to the lower end of second upright  159 , is removably mounted on the landing  920   N  (e.g., projected to the floor of the landing  920   N  by a retractable member, thereby simply lapping the landing  920   N ); and two ends of the cable-stayed member  158  are pivotably connected to the upper end of the second upright  159  and the jumping platform  150  respectively; therefore, the cable-stayed member  158 , the second upright  159  and the right end part of the jumping platform  150  can construct a relatively stable structure with right triangle, and the jumping platform  150  is fixedly mounted in the hoistway  910  corresponding to the landing  920   N . When the jumping platform  150  needs to be removed, the second upright  159  can be dismounted from the landing  920   N , and the second upright  159  and the cable-stayed member  158  can be rotated and placed on the jumping platform  150 , ready for removing the jumping platform  150 . After the jumping platform  150  jumps to the next landing (e.g., landing  920   N+2 ), the second upright  159  is pulled out and positioned and mounted at the landing  920   N+2 , so that its operation is very convenient. 
     It is to be noted that, since no elevator machine room is provided on the jumping platform  150 , the jumping platform  150  can be implemented in a relatively simple structure and is lightweight, for example, the jumping platform  150  can be implemented in a simple spandrel girder frame or the like and occupies a small hoistway space in the up-down direction; moreover, the jumping platform  150  also thus can be implemented at low cost even though the jumping platform  150  did not be transformed to a component of the conventional elevator system after the building construction is completed, the cost is low for the constructor of the building. In addition, the jumping platform  150  can be reused in a different jumping elevator system for manufacturers of jumping elevator. 
     Still referring to  FIG. 1 , the lifting assembly in an embodiment includes a hoisting member  171 , a hoist  172 , a suspension beam  173 , and a diverting pulley  174  mounted on the suspension beam  173 . The lifting assembly may be configured to lift the jumping platform  150  to a higher height when the height of the hoistway  910  is increased, and further lifting the elevator car  110  after lifting the jumping platform  150  so as to extend its traveling distance in the hoistway  910 . It is to be noted that rope compensation may be provided from, for example, the first end  1411  when lifting the elevator car  110 , specifically a rope compensating component (not shown in figures) cab be provided at a location corresponding to the first end  1411 . 
     Due to the fact that the jumping platform  150  is lightweight (because the elevator machine room is not provided on the jumping platform  150 ) and the jumping platform  150  and the elevator car  110  are lifted separately, the lifting power requirement for the lifting assembly is greatly reduced, which favors to simplify the structural design of the lifting assembly and saving the construction cost of a building. 
     It will be appreciated that, prior to lifting the elevator car  110 , the lifting assembly may be reloaded on the elevator car  110  from the jumping platform  150 ; specifically, the hoist  172  is removably mounted on the jumping platform  150  or the elevator car  110 , and the hoisting member  171  (e.g., a rope) may extend from the hoist  172 , wrap though the diverting pulley  174 , and extend onto the jumping platform  150  or the elevator car  110 ; in such, it is easy to reload the hoist  172  and the hoisting member  171  between the jumping platform  150  and the elevator car  110 . Specifically, one end of the suspension beam  173  can be hinged and fixed to the landing  920   N , the other end of the suspension beam  173  is in lap joint with the hoistway  910 , thereby the dismounting of the lifting assembly relative to the landing  920  is easy, and the workload of the jumping operation is reduced. 
     In view that the power requirement on the hoist  172  are greatly reduced, the hoist  172  can be selectively implemented by a cable climber, which is low in cost and small in volume. 
     It should be noted that a fixing member (e.g., suspension, safety clamp, etc.) may be provided on the corresponding elevator car  110 . The elevator car  110  can be fixed to the guide rail  930  by the fixing member during lifting of the jumping platform  150 , thus free lifting of the jumping platform  150  is unaffected from the elevator car  110 . 
     Referring to  FIG. 5 , the jumping elevator system  10  also includes a temporary working platform  160  used in the jumping process. The temporary working platform  160  can be independently arranged relative to the jumping platform  150 , and the temporary working platform  160  is provided for preliminarily positioning and mounting the guide rail  930   b  to be reinforced, jointed at a second height (e.g., the landing  920   N ), relative to the hoistway  910  prior to lifting the jumping platform  150  from the second height (e.g., landing  920   N ); specifically, the temporary working platform  160  is positioned and installed on the landing  920   N+2  and placed in the hoistway  910 , thereby providing a worker  90  with a working platform in the hoistway  910 ; the worker  90  can conveniently mount the guide rail bracket  931   b  on the wall of the hoistway  910 , so that the guide rail  930   b  to be mounted is primarily positioned and mounted relative to the hoistway  910 . 
     In an embodiment, the temporary working platform  160  is positioned and mounted on a landing  920  (e.g., landing  920   N+2 ) corresponding to a first height by a first uprights  169 . After completing the work of preliminary positioning and installing for the guide rail  930   b , the temporary working platform  160  can be removed from the landing  920   N+2  and continue to be applied during the next jumping operation. The temporary working platform  160  can be realized by a simple steel structure frame, is low in manufacturing cost and can be shared by a plurality of jumping elevator systems  10  in a plurality of hoistways  910 , so that the construction cost of a building can be reduced. Also, in conjunction with the following example illustration of the jumping method, it will be appreciated that the temporary working platform  160  will be highly advantageous to avoid the use of scaffolding in the hoistway  910  to position and mount a newly extending rail  930   b.    
       FIG. 2  shows a structural schematic of a jumping elevator system in accordance with another embodiment of the present invention. Compared to the embodiment of jumping elevator system  10  shown in  FIG. 1 , the jumping elevator system  20  has the main difference lying in that the arrangement of the pulley assembly thereof is different so as to achieve different traction ratio, and the traction ratio of the jumping elevator system  20  is 1:1. 
     Referring to  FIG. 2 , the top of the elevator car  110  is not provided with a roof pulley, nor is the top of the counterweight  120  provided with a diverting sheave, and the first end  1411  of the rope  141  is secured to the top of the elevator car  110 , the rope  141  extends upwards from the first end  1411  and wraps through the one or more first top guide sheaves  143   a , extends downwards and wraps through the first bottom guide sheave  144   a , and continues to extend to the traction sheave  131  of the elevator machine room  130 ; after wrapping through the traction sheave  131 , the rope  141  then extends laterally and wraps through one or more second bottom guide sheaves  144   b , extends upwards and wraps through a second top guide sheave  143   b  of the top guide sheave  143 , and continues downwards to the counterweight  120 . In this way a traction ratio of 1:1 of the jumping elevator system  20  can be specifically achieved. 
     In other embodiment, the top diverting sheave  145  as shown in  FIG. 1  can also be provided on the counterweight  120  in  FIG. 2 , through which the rope  141  wraps and extends upwards to the second end  1412 , such that an arrangement of the elevator car without a roof pulley and the counterweight with a sheave is achieved. 
     Based on the above teachings of the arrangements of pulley assemblies of  FIGS. 1 and 2 , it will be appreciated that pulley assembly arrangements corresponding to other traction ratios may also be applied in the present invention. 
       FIG. 3  shows a flowchart of a method of jumping a jumping elevator system according to an embodiment of the present invention;  FIG. 4  to  FIG. 9  illustrate a jumping process of the jumping elevator system of the embodiment shown in  FIG. 1  based on the jumping method of the embodiment shown in  FIG. 3 , wherein,  FIG. 4  illustrates the jumping elevator system preparing for jumping from the landing  920   N ,  FIG. 5  illustrates installing the temporary working platform from the landing  920   N+2  for preliminarily positioning and mounting guide rails in the hoistway,  FIG. 6  illustrates the use of the lifting assembly to lift the jumping platform from the landing  920   N  to approximately the landing  920   N+2 ,  FIG. 7  illustrates lifting the elevator car progressively starting from the landing  920   N−1  by use of the lifting assembly and positioning and mounting the guide rails segment by segment on the top of the elevator car,  FIG. 8  illustrates that the elevator car is lifted to the landing  920   N+1  by use of the lifting assembly and all guide rails are positioned and mounted well segment by segment on the top of the elevator car, and  FIG. 9  illustrates that the jumping elevator system completes a jumping operation and is ready to regain entering normal elevator operation. The operating principle of the jumping elevator system of the embodiment shown in  FIG. 1  and an embodiment of jumping method of the invention are illustrated by example below in connection with  FIGS. 3-9 . 
     Firstly, in step S 310 , referring to  FIG. 4 , preparatory works are completed prior to the jumping, which specially includes securing the elevator car  110  to an mounted guide rail  930   a  below the second height (e.g., a height corresponding to the landing  920   N ) by securing members such as safety clamps, suspensions, etc., securing the counterweight  120  in the hoistway  910  (e.g., securing the counterweight  120  in the bottom of the hoistway  910  by securing portion  121 ); 
     In step S 320 , the temporary working platform  160  is positioned and mounted on a landing (e.g., landing  920   N+2 ) corresponding to the first height via the first upright  169 , such that the worker  90  can conveniently enter from the landing  920   N+2  onto the temporary working platform  160  and operate in the hoistway  910 . 
     In step S 330 , referring to  FIG. 5 , the guide rail  930   b  to be mounted, jointed at the second height, is preliminary positioned and mounted in the hoistway  910  corresponding to approximately the first height (e.g., in the hoistway corresponding to the landing  920   N+2 ) by means of the temporary working platform  160 , for instance, the guide rail  930   b  hoisted into the hoistway  910  is fastened relative to the hoistway  910  at the first height with the guide rail bracket  931   b . It will be understood that, in consideration of safety requirements, the guide rail  930   b  with such preliminary positioning and mounting conditions is not suitable for guiding the elevator car  110  to travel thereon. 
     In step S 340 , the temporary working platform  160  is removed from the landing  920   N+2 , that is, removing the temporary working platform  160  from a position of the hoistway  910  corresponding to the first height, thereby unaffecting subsequent lifting operations. 
     In step S 350 , referring to  FIG. 6 , the jumping platform  150  is lifted from the landing  920   N  to the landing  920   N+2  by use of the lifting assembly; as desired, in other embodiment, it is also possible to lift the jumping platform  150  from the landing  920   N  to the landing  920   N+1 ; that is say, in this step, the lifting assembly may be used to lift the jumping platform  150  from the second height to a third height, wherein the third height is greater than the second height and less than or equal to the first height. In this step, since the jumping platform  150  is lightweight and no worker  90  is standing on it, it can be done relatively quickly. 
     In step S 360 , referring to  FIG. 7 , the lifting assembly is reloaded on the elevator car  110  from the jumping platform  150 , specifically, the hoist  172  and the hoisting member  171  may be removed from the jumping platform  150  firstly and then mounted respectively on the top of the elevator car  110 , thereby preparing for performing a lifting operation on the elevator car  110 . 
     In step S 370 , referring to  FIGS. 7 and 8 , the elevator car  110  is lifted by use of the lifting assembly to extend its traveling distance in the hoistway  910 , and operations is performed on the top of the elevator car  110  during lifting of the elevator car  110  for sectionally reinforcing the mounting of the guide rails  930   b  to be mounted. It will be appreciated that, prior to lifting the elevator car  110 , the fixation of the elevator car  110  relative to the guide rail  930   a  can be released. It will be appreciated that, in the process of lifting the elevator car  110  by the lifting assembly, the lifting assembly and the elevator car  110  together provide the worker  90  with a working platform for reinforcing the mounting of the guide rail  930   b ; the reinforcement of mounting may specifically refer to mounting the guide rail  930   b  to the wall of the hoistway  910  with a plurality of guide rail brackets  931 . 
     In step S 370 , the worker  90  can stand on top of the elevator car  110  for performing mounting operation of such as the guide rail bracket  931 , and the hoisting member  171  of the lifting assembly and the rope  141  of the pulley assembly can provide a good safety guarantee for the lifting process of the elevator car  110 ; the mounting of guide rail  930   b  is reinforced sectionally during progressive lifting of the elevator car  110 , thereby providing guide rail segments with enough safety for the elevator car  110  in the subsequent lifting process. By way of example, through this step S 370 , not only is the guide rails  930   b  below the landing  920   N+2  positioned and mounted well, the elevator car  110  is also lifted relative to the counterweight  120 , for example, lifted to the landing  920   N+1 . 
     It should be noted that the “lifting process of the elevator car  110 ” in this step S 370  can include multiple sub-processes of sectionally lifting the elevator car  110 , and the lifting of the elevator car  110  and the operation of reinforcing the mounting of the guide rail  930  can be performed at the same time. In an embodiment, after each of the guide rail  930   b  is reinforced well by the worker  90  on the elevator car  110 , the lifting assembly may be controlled to lift the elevator car  110  with a distance along the well-reinforced guide rail  930   b.    
     In step S 380 , referring to  FIG. 9 , it is the recovery step after the jumping is completed, which mainly includes the worker  90  coming out of the hoistway  910 , removing the lifting assembly from the landing, releasing the fixation of the counterweight  120 , and the like; elevator car  110  may thus travel between the landing  920   1  and the landing  920   N+1  under the drive of the tractor. 
     Thereto, the jumping process of the jumping elevator system  10  is substantially completed. It will be understood that the above jumping process can be repeated, and the embodiment of the jumping elevator system  20  shown in  FIG. 2  can also complete a similar jumping process. 
     The jumping method of the above embodiment especially have one or more of the following advantages: 
     (1) Scaffolding in the hoistway  910  for positioning and mounting the guide rails  930   b  is not required during the entire jumping process, so that the jumping operation becomes simple, efficient and low-cost; 
     (2) the worker  90  can perform operation of reinforcing the mounting of the guide rail  930   b  on the top of the elevator car  110 , so that the mounting of the guide rail can be reinforced sectionally while the elevator car  110  is progressively lifted relative to the counterweight  120 , and the safety of the worker  90  is good; 
     (3) the same lifting assembly can be used for separately completing lifting operations for the jumping platform  150  and the elevator car  110 , and the lifting assembly can be realized at low cost; 
     (4) for the well-built hoistway  910 , the height at which the jumping platform  150  and the elevator car  110  are able to jump is high, for instance, the jumping platform  150  can jump even to the highest landing of the hoistway  910  and the elevator car  110  can jump even to the second-highest landing of the hoistway  910 . 
     It will be appreciated, in connection with the above jumping methods, that embodiment of the jumping elevator system of the present invention have one or more of the following advantages: 
     (a) the jumping platform  150  and the elevator car  110  can be separately jumped, so that the worker  90  can safely perform operations of positioning and mounting the guide rail  930   b  at the top of the elevator car  110 , thus the mounting of guide rail can be reinforced sectionally while the elevator car  110  is progressively lifted relative to the counterweight  120 , and there is no need to use scaffolding in the hoistway  910  for positioning and mounting rails  930   b  in cooperate with the use of the temporary working platform  160 ; 
     (b) the elevator machine room  130  can be flexibly arranged on the outside of the hoistway  910 , and its temporary mounting and dismounting are convenient, and it can avoid severe environments (such as severe environments in extreme weather) in hoistway  910  not constructed well, thereby guaranteeing the reliability and safety of the elevator machine room  130 ; 
     (c) the lifting assembly, the jumping platform  150  and the like can be realized at low cost, so that the cost of the jumping elevator system  10  can be greatly reduced; 
     (d) for the well-built hoistway  910 , the height at which the jumping platform  150  and the elevator car  110  are able to jump is high, for instance, the jumping platform  150  can jump even to the highest landing of the hoistway  910  and the elevator car  110  can jump even to the second-highest landing of the hoistway  910 ; moreover, since no elevator machine room is provided in the pit of the hoistway  910 , the elevator car  110  can travel to the lowest landing of the hoistway, thus during construction process of a building, the range of travel-able landings for the elevator car  110  is large, and the conveying of workers and/or materials can be achieved between more landings. 
     The above examples mainly illustrate the embodiments of the jumping elevator system and the jumping method of the present invention. Although only some of the embodiments of the present invention have been described, those ordinarily skilled in the art shall understand that that the present invention can be implemented in many other forms without departing from its principle and scope. Therefore, the examples and implementations described are regarded as illustrative rather than restrictive, and the present invention may cover various modifications and substitutions as long as they do not depart from the spirit and scope of the present invention as defined by the appended claims.