EP1417149A1 - Method and arrangement for forming a safety space in the lower part of an elevator shaft - Google Patents

Method and arrangement for forming a safety space in the lower part of an elevator shaft

Info

Publication number
EP1417149A1
EP1417149A1 EP02755043A EP02755043A EP1417149A1 EP 1417149 A1 EP1417149 A1 EP 1417149A1 EP 02755043 A EP02755043 A EP 02755043A EP 02755043 A EP02755043 A EP 02755043A EP 1417149 A1 EP1417149 A1 EP 1417149A1
Authority
EP
European Patent Office
Prior art keywords
floor
elevator car
safety space
elevator
car
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02755043A
Other languages
German (de)
French (fr)
Other versions
EP1417149B1 (en
Inventor
Petteri Valjus
Marco Steen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kone Corp
Original Assignee
Kone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kone Corp filed Critical Kone Corp
Publication of EP1417149A1 publication Critical patent/EP1417149A1/en
Application granted granted Critical
Publication of EP1417149B1 publication Critical patent/EP1417149B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
    • B66B11/02—Cages, i.e. cars
    • B66B11/0226—Constructional features, e.g. walls assembly, decorative panels, comfort equipment, thermal or sound insulation
    • B66B11/0246—Maintenance features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/0043—Devices enhancing safety during maintenance
    • B66B5/005—Safety of maintenance personnel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B19/00—Mining-hoist operation
    • B66B19/007—Mining-hoist operation method for modernisation of elevators

Definitions

  • the present invention relates to a method as defined in the preamble of claim 1 and to an arrangement as defined in the preamble of claim 5 for forming a safety space in the lower part of an elevator shaft.
  • a safety space in the lower part of an elevator shaft is implemented, if possible, by making the pit forming a safety space deep enough so that a "safety cube" of a size of at least 500*600*800 mm as required by elevator regulations can be fitted in it at least with the shortest side upward.
  • the problem with this solution is the increased depth of the pit and, especially in the case of modernization, the difficulty of making the pit and a costly implementation.
  • the elevator shaft is pro- vided with safety buffers which in a normal situation are in a lying position on the shaft bottom, and which the serviceman raises to an upright position as he enters the elevator shaft from the bottom floor to carry out maintenance work or similar operations.
  • the length of the safety buffers is so designed that, in a failure situation, the elevator car or counterweight can not fall too far down causing injury to a person on the shaft bottom.
  • this solution involves the drawback that the safety buffers and their pivot structure occupy some space on the shaft bottom even during normal elevator opera- tion, so this solution is not applicable in implementations required in the case of a very small shaft bottom space.
  • a safety system provided between the elevator car and a shaft wall stops the elevator at a certain height from the shaft bottom when necessary.
  • the system comprises stopper elements fixedly mounted on an outer wall of the elevator car or on the car frame and support pillars of a certain length placed on the shaft bottom.
  • the support pillars are turned aside from under the stopper elements .
  • the support pillars are turned into an upright position, thus preventing the elevator car from descending too far down in the shaft.
  • the drawback is a complicated and expensive structure because the solution requires several stoppers and switches and other components in order to be functional.
  • Special buffer arrangements in general have the drawback of requiring an expensive and complicated structure.
  • a further disadvantage common to special buffers and other support solu- tions is that they limit the distance of elevator travel during maintenance operation so that it is shorter than the traveling distance from the top floor to the bottom floor. Therefore, during inspection and maintenance operation, the eleva- tor can only be driven through a distance somewhat less than the entire normal traveling distance.
  • the object of the invention is to eliminate the above- mentioned drawbacks and to achieve an economical, reliable and easy-to-use method and arrangement for forming a safety space in the lower part of an elevator shaft.
  • the method of the invention is characterized by what is presented in the characterization part of claim 1 and the arrangement of the invention is characterized by what is presented in the characteri- zation part of claim 5.
  • Other embodiments of the invention are characterized by what is presented in the other claims.
  • the method of the invention has the advantage that, with a simple structure, a safety space as required by the norms can be provided in the lower part of even a low-rise elevator shaft.
  • the solution of the invention is excellently suited for elevators to be modernized and especially for so-called rucksack-type elevators, in which both the buffer and the hoisting point of the car are located in the rear part of the car, the space under the car floor being a continuous space without a car frame intermediate bearer and without a buffer in the middle of the pit.
  • a further advantage is that no extra structures are needed on the bottom of the pit, so the depth of the pit required is very small, thus allowing the elevator car to go as far down as possible in normal operation.
  • the pit need not have a depth larger than that required by normal buffers and passages.
  • Fig. 1 presents an elevator car requiring prior-art solutions, in simplified and sectioned side view
  • Fig. 2 presents a safety solution according to the invention in simplified and sectioned side view.
  • an elevator car 2 is seen in an elevator shaft 1, at a position near the bottom floor 4.
  • elevator car refers to all types of car solutions, e.g. those comprising a car frame around the car.
  • elevator car it refers to all types of car solutions, e.g. those comprising a car frame around the car.
  • safety buffers or support pillars as used in prior art are needed, or the pit 5 has to be made deeper as necessary.
  • Fig. 2 presents a solution according to the invention, in which the load-bearing floor 3 of the elevator car 2, or a part of it, is so implemented that it can be turned about a joint 8 into an upright position or a nearly upright position.
  • the joint 8 serving as a hinge is located at the front edge of the elevator car, so that when the floor 3 is raised to the upright position, it simultaneously prevents entry into the elevator car during maintenance operations .
  • the car is provided with a limit switch 7, which is so disposed that the raised floor 3 will activate the switch when the floor is in the intended raised position.
  • the solution is so implemented that maintenance operation is only possible after the limit switch 7 has been activated. This ensures that the floor can not remain in the position for normal operation and entry into the car is obstructed during maintenance operation.
  • the elevator car is provided with a horizontal safety batten 6, which is placed near the junction between the back wall and the floor and is always mounted in place when the floor is in the normal position.
  • the batten is so fastened that it will be released by an upward force of suitable magnitude applied to the floor.
  • the force applied to the floor from below will release the batten and the floor will turn upward about its joint 8.
  • a safety space is formed in the lower part of the elevator shaft by driving the elevator car 2 to a suitable position in the shaft and raising the car floor 3 at least so far up that the required safety space height is reached in the lowest position of the elevator car.
  • the raising of the floor is preferably implemented by turning the floor upward by its back edge about the hinge 8 at the front edge of the car.
  • the elevator system is informed via the limit switch 7 that the floor 3 is in the position required for maintenance operation or a similar action.
  • the floor can be raised manually. To do this, first the safety batten 6 is released, whereupon the floor is turned to its raised position, in which the floor can be locked.
  • the inven- tion is not limited to the example described above, but that it may be varied within the scope of the claims presented below.
  • the structure of the safety arrangement may differ from that described above in that, instead of a hinged floor, the elevator car is provided with a floor that can be raised straight upward by four points.
  • the limit switch 7 is so disposed that it will only be acti- vated when the floor is in the intended raised position.
  • the floor may consist of e.g. two parts, in which case the floor is turned up from the center either towards the front and rear edges of the car or towards the side walls of the car.
  • the floor need not necessarily be completely removed aside from its position over the safety space. In the case of large cars it may suffice that only a sufficient part of the floor is removed, raised or turned aside to form the required safety space.
  • the floor may also have a telescoping structure, allowing the floor to be retracted horizontally to positions as close as possible to opposite walls of the car. Likewise, the hinge can then be placed elsewhere than at the very edge of the floor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Cage And Drive Apparatuses For Elevators (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)

Abstract

The invention concerns a method and system for forming a safety space in the lower part of an elevator shaft. To provide the required safety space, the floor (3) of the elevator car (2) is removed from its position over the safety space. This is preferably accomplished by turning the floor upward about a hinge (8) in the front edge of the floor so as to bring the floor to a position in front of the door of the elevator car.

Description

METHOD AND ARRANGEMENT FOR FORMING A SAFETY SPACE IN THE LOWER PART OF AN ELEVATOR SHAFT
The present invention relates to a method as defined in the preamble of claim 1 and to an arrangement as defined in the preamble of claim 5 for forming a safety space in the lower part of an elevator shaft.
A problem often encountered in modernization projects in old buildings is that safety regulations have changed over the years and no sufficient safety space as required by today's regulations is provided in the lower part of the existing elevator shaft. In general, a modification to provide more space in the lower part of the shaft is either too expensive or even technically impossible to carry out. For the reasons stated above, safety solutions requiring as little space as possible are generally used.
In prior art, a safety space in the lower part of an elevator shaft is implemented, if possible, by making the pit forming a safety space deep enough so that a "safety cube" of a size of at least 500*600*800 mm as required by elevator regulations can be fitted in it at least with the shortest side upward. The problem with this solution is the increased depth of the pit and, especially in the case of modernization, the difficulty of making the pit and a costly implementation.
In prior art, in cases where it has not been possible to deepen the pit, various safety buffers or supports, mounted either on the floor of the pit or on a shaft wall immediately next to the floor, that can be raised or turned into an upright position to allow maintenance operations, have been used. Another expedient used is to attach to the guide rails an element, e.g. a form-closed dowel or equivalent, designed to stop the motion of the elevator car. International patent application no. WO 99/47447 (FI 980594) discloses a safety device designed for the above-mentioned purpose to ensure a safety space in the elevator shaft during maintenance work. In this solution, the elevator shaft is pro- vided with safety buffers which in a normal situation are in a lying position on the shaft bottom, and which the serviceman raises to an upright position as he enters the elevator shaft from the bottom floor to carry out maintenance work or similar operations. The length of the safety buffers is so designed that, in a failure situation, the elevator car or counterweight can not fall too far down causing injury to a person on the shaft bottom. However, this solution involves the drawback that the safety buffers and their pivot structure occupy some space on the shaft bottom even during normal elevator opera- tion, so this solution is not applicable in implementations required in the case of a very small shaft bottom space.
Another prior-art solution is disclosed in international patent application no. WO 97/23399. In this solution, a safety system provided between the elevator car and a shaft wall stops the elevator at a certain height from the shaft bottom when necessary. The system comprises stopper elements fixedly mounted on an outer wall of the elevator car or on the car frame and support pillars of a certain length placed on the shaft bottom. For normal elevator operation, the support pillars are turned aside from under the stopper elements . Before maintenance work, inspection or similar operations, the support pillars are turned into an upright position, thus preventing the elevator car from descending too far down in the shaft. The drawback is a complicated and expensive structure because the solution requires several stoppers and switches and other components in order to be functional.
Special buffer arrangements in general have the drawback of requiring an expensive and complicated structure. A further disadvantage common to special buffers and other support solu- tions is that they limit the distance of elevator travel during maintenance operation so that it is shorter than the traveling distance from the top floor to the bottom floor. Therefore, during inspection and maintenance operation, the eleva- tor can only be driven through a distance somewhat less than the entire normal traveling distance.
The object of the invention is to eliminate the above- mentioned drawbacks and to achieve an economical, reliable and easy-to-use method and arrangement for forming a safety space in the lower part of an elevator shaft. The method of the invention is characterized by what is presented in the characterization part of claim 1 and the arrangement of the invention is characterized by what is presented in the characteri- zation part of claim 5. Other embodiments of the invention are characterized by what is presented in the other claims.
The method of the invention has the advantage that, with a simple structure, a safety space as required by the norms can be provided in the lower part of even a low-rise elevator shaft. The solution of the invention is excellently suited for elevators to be modernized and especially for so-called rucksack-type elevators, in which both the buffer and the hoisting point of the car are located in the rear part of the car, the space under the car floor being a continuous space without a car frame intermediate bearer and without a buffer in the middle of the pit. A further advantage is that no extra structures are needed on the bottom of the pit, so the depth of the pit required is very small, thus allowing the elevator car to go as far down as possible in normal operation. The pit need not have a depth larger than that required by normal buffers and passages. An additional advantage is that, by using the solution of the invention, the distance traversed during maintenance and inspection operation becomes the same as in normal operation, the reliability being thus improved. In the following, the invention will be described in detail by the aid of an example with reference to the attached drawings, wherein
Fig. 1 presents an elevator car requiring prior-art solutions, in simplified and sectioned side view, and Fig. 2 presents a safety solution according to the invention in simplified and sectioned side view.
In the solution illustrated in Fig. 1, an elevator car 2 is seen in an elevator shaft 1, at a position near the bottom floor 4. Although in the following description only the term "elevator car" is used, it refers to all types of car solutions, e.g. those comprising a car frame around the car. To provide the space required for a "safety cube" 9 consistent with elevator standards, it is it is required that the elevator car 2 be stopped completely above the "safety cube" . In the approach illustrated in Fig. 1, special safety buffers or support pillars as used in prior art are needed, or the pit 5 has to be made deeper as necessary.
Fig. 2 presents a solution according to the invention, in which the load-bearing floor 3 of the elevator car 2, or a part of it, is so implemented that it can be turned about a joint 8 into an upright position or a nearly upright position. The joint 8 serving as a hinge is located at the front edge of the elevator car, so that when the floor 3 is raised to the upright position, it simultaneously prevents entry into the elevator car during maintenance operations .
The car is provided with a limit switch 7, which is so disposed that the raised floor 3 will activate the switch when the floor is in the intended raised position. The solution is so implemented that maintenance operation is only possible after the limit switch 7 has been activated. This ensures that the floor can not remain in the position for normal operation and entry into the car is obstructed during maintenance operation.
As an additional precaution, the elevator car is provided with a horizontal safety batten 6, which is placed near the junction between the back wall and the floor and is always mounted in place when the floor is in the normal position. The batten is so fastened that it will be released by an upward force of suitable magnitude applied to the floor. Thus, in case the elevator car should fall down over a person on the shaft bottom, the force applied to the floor from below will release the batten and the floor will turn upward about its joint 8.
By the method of the invention, a safety space is formed in the lower part of the elevator shaft by driving the elevator car 2 to a suitable position in the shaft and raising the car floor 3 at least so far up that the required safety space height is reached in the lowest position of the elevator car. The raising of the floor is preferably implemented by turning the floor upward by its back edge about the hinge 8 at the front edge of the car. When the floor is in the desired position intended for it, the elevator system is informed via the limit switch 7 that the floor 3 is in the position required for maintenance operation or a similar action. The floor can be raised manually. To do this, first the safety batten 6 is released, whereupon the floor is turned to its raised position, in which the floor can be locked.
It is obvious to the person skilled in the art that the inven- tion is not limited to the example described above, but that it may be varied within the scope of the claims presented below. Thus, for example, the structure of the safety arrangement may differ from that described above in that, instead of a hinged floor, the elevator car is provided with a floor that can be raised straight upward by four points. In this case, the limit switch 7 is so disposed that it will only be acti- vated when the floor is in the intended raised position. Likewise, the floor may consist of e.g. two parts, in which case the floor is turned up from the center either towards the front and rear edges of the car or towards the side walls of the car.
It is also to be noted that the floor need not necessarily be completely removed aside from its position over the safety space. In the case of large cars it may suffice that only a sufficient part of the floor is removed, raised or turned aside to form the required safety space. The floor may also have a telescoping structure, allowing the floor to be retracted horizontally to positions as close as possible to opposite walls of the car. Likewise, the hinge can then be placed elsewhere than at the very edge of the floor.

Claims

1. Method for forming a safety space in the lower part of an elevator shaft, characterized in that, to form the required safety space, the floor (3) of the elevator car (2) is removed from the position where it is during normal operation.
2. Method according to claim 1 for forming a safety space in the lower part of an elevator shaft, characterized in that, to form the required safety space, the floor (3) of the elevator car (2) is turned upward about a joint (8) at the front edge of the elevator car.
3. Method according to claim 1 for forming a safety space in the lower part of an elevator shaft, characterized in that, to form the required safety space, the floor (3) of the elevator car (2) is raised straight upward by all its corners.
4. Method according to claim 1 for forming a safety space in the lower part of an elevator shaft, characterized in that, to form the required safety space, the floor (3) of the elevator car (2) is retracted telescopically aside from the position where it is during normal operation.
5. Arrangement for forming a safety space in the lower part of an elevator shaft, said arrangement comprising an elevator car (2) provided with a floor (3) and moving in the elevator shaft, characterized in that the floor (3) of the elevator car is so implemented that it can be removed away from the posi- tion where it is during normal operation in order to form the required safety space in connection with maintenance operation or equivalent .
6. Arrangement according to claim 5, characterized in that the floor (3) is so hinged on the front edge of the elevator car
(2) that the floor can be raised by its rear edge into a sub- stantially upright position in front of the door of the elevator car.
7. Arrangement according to claim 5 , characterized in that the floor (3) is so mounted on the lower edge of the elevator car that the floor can be raised upward by all its corners in a substantially horizontal position.
8. Arrangement according to claim 5, 6 or 7, characterized in that the floor (3) of the elevator car is composed of telescoping parts that can be retracted into each other towards the walls of the elevator car so as to form the required safety space in the central part of the floor of the elevator car.
9. Arrangement according to claim 5, 6 or 7 , characterized in that the floor (3) of the elevator car has been mounted in place by means of a safety batten (6) which is so attached to the lower part of the car that in a normal situation the rais- ing of the floor is prevented, but when a force directed upward from below the car reaches an intensity higher than normal, the batten (6) will be detached, releasing the floor to rise upward.
10. Arrangement according to any one of the preceding claims, characterized in that a limit switch (7) is provided in connection with the elevator car, said limit switch being so implemented that it will give an indication of the floor having been removed into a position for maintenance operation or equivalent.
EP02755043A 2001-08-13 2002-08-09 Method and arrangement for forming a safety space in the lower part of an elevator shaft Expired - Lifetime EP1417149B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20011635 2001-08-13
FI20011635A FI115625B (en) 2001-08-13 2001-08-13 Procedure and arrangement for creating a safety space in the lower shaft of the elevator shaft
PCT/FI2002/000658 WO2003016192A1 (en) 2001-08-13 2002-08-09 Method and arrangement for forming a safety space in the lower part of an elevator shaft

Publications (2)

Publication Number Publication Date
EP1417149A1 true EP1417149A1 (en) 2004-05-12
EP1417149B1 EP1417149B1 (en) 2005-12-14

Family

ID=8561729

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02755043A Expired - Lifetime EP1417149B1 (en) 2001-08-13 2002-08-09 Method and arrangement for forming a safety space in the lower part of an elevator shaft

Country Status (6)

Country Link
EP (1) EP1417149B1 (en)
CN (1) CN1291905C (en)
DE (1) DE60208043T2 (en)
ES (1) ES2252496T3 (en)
FI (1) FI115625B (en)
WO (1) WO2003016192A1 (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2035313B1 (en) * 2006-06-30 2010-11-03 Otis Elevator Company Safety device for securing minimum spaces at the top or bottom of an elevator shaft being inspected, and elevator having such safety devices
CH698910B1 (en) * 2006-12-20 2009-12-15 Henseler H Ag Elevator car for reduced elevator shaft heads.
DE102007049737A1 (en) 2007-10-16 2009-04-23 Exclusive Lift Gmbh Elevator installation for persons and / or loads with at least one elevator car
DE102010055353A1 (en) 2010-12-20 2012-06-21 ALKO Fördertechnik GmbH Device for protecting person in hopper end, particularly for elevators of elevator system, has combination folding support in area of hopper floor, where combination folding support has main support and column
BR112013024033A2 (en) * 2011-03-21 2017-06-27 Inventio Ag elevator having minimum elevator shaft depth and a permanent protective space
CN102424314A (en) * 2011-10-28 2012-04-25 上海东锐风电技术有限公司 Lower limiting device of fan tower barrel elevator
ES2721022T3 (en) * 2013-05-28 2019-07-26 Inventio Ag Elevator box with reduced box pit and reduced box header
CN104961012A (en) * 2015-07-06 2015-10-07 康力电梯股份有限公司 Protective device for pit maintenance
US20180251340A1 (en) * 2015-09-25 2018-09-06 Aurélien Fauconnet Accessible elevator buffer
EP3424858B1 (en) * 2017-07-03 2020-04-01 Otis Elevator Company Elevator maintenance space projection systems
WO2022136118A1 (en) * 2020-12-23 2022-06-30 Inventio Ag Elevator car for an elevator system and installation method for installing an elevator system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE171423C (en) *
DE171424C (en) *
JPH09202557A (en) * 1996-01-25 1997-08-05 Otis Elevator Co Home elevator
EP0870722B1 (en) * 1997-04-10 2002-10-23 Inventio Ag Maintenance apparatus for elevator car
WO2001089977A1 (en) * 2000-05-25 2001-11-29 Inventio Ag Elevator installation with a device for carrying out work in an elevator shaft

Non-Patent Citations (1)

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Title
See references of WO03016192A1 *

Also Published As

Publication number Publication date
FI20011635L (en) 2003-02-14
ES2252496T3 (en) 2006-05-16
FI20011635A0 (en) 2001-08-13
DE60208043T2 (en) 2006-06-29
WO2003016192A1 (en) 2003-02-27
EP1417149B1 (en) 2005-12-14
CN1291905C (en) 2006-12-27
CN1541180A (en) 2004-10-27
DE60208043D1 (en) 2006-01-19
FI115625B (en) 2005-06-15

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