EP2824055A1 - Tampon de cuvette d'ascenseur - Google Patents

Tampon de cuvette d'ascenseur Download PDF

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Publication number
EP2824055A1
EP2824055A1 EP13175910.2A EP13175910A EP2824055A1 EP 2824055 A1 EP2824055 A1 EP 2824055A1 EP 13175910 A EP13175910 A EP 13175910A EP 2824055 A1 EP2824055 A1 EP 2824055A1
Authority
EP
European Patent Office
Prior art keywords
roping
pit
counterweight
elevator car
elevator
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.)
Withdrawn
Application number
EP13175910.2A
Other languages
German (de)
English (en)
Inventor
Raimo Pelto-Huikko
Sakari Korvenranta
Markku HÄIVÄLÄ
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
Priority to EP13175910.2A priority Critical patent/EP2824055A1/fr
Publication of EP2824055A1 publication Critical patent/EP2824055A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B66B5/28—Buffer-stops for cars, cages, or skips
    • B66B5/282—Structure thereof

Definitions

  • the present invention relates to a pit buffer of an elevator.
  • an elevator car and a counterweight move reciprocally in a substantially vertical direction between the lowest and highest landing levels served by the elevator.
  • a pit buffer is a part of this elevator safety system and is located in the elevator pit at the bottom of the elevator shaft.
  • the purpose of the pit buffer is to decelerate the elevator car or the counterweight in case the elevator car for some reason passes either below the lowest landing level or above the highest landing level with its normal traveling speed.
  • the pit buffer is configured so, that it brings the elevator car or the counterweight to a stop within a distance that is safe for elevator passengers and for the structural components of the elevator.
  • elevators can have either spring buffers or hydraulic buffers receiving the descending elevator car or counterweight. In elevators whose traveling speed exceeds 1 m/s, hydraulic buffers are used.
  • the elevator pit depth is determined by the distance required for the safe deceleration of the elevator or the counterweight and the safety clearance between the lowest part of the elevator car and the elevator pit floor.
  • the structural length of current pit buffers exceeds this at elevator traveling speeds above approximately 2,5 m/s, thus forcing elevator pits to be built deeper than necessary and adding to the cost of elevator construction.
  • the elevator car and the counterweight each have their own buffers and their placement is challenging, since they should be located in the same approximate area as the compensator assembly used for balancing the weight of the hoisting cables and compensating for their elongation.
  • an elevator pit buffer in which the elevator buffer assembly includes a pair of pistons mounted outboard of each side of the elevator car and a rope is reeved about the pistons through a sheave joined at the upper end of the piston. The rope is dead-hitched to the floor or the wall of the elevator pit below the buffer sheaves.
  • the pit buffer assembly for the counterweight is substantially identical to that of the elevator car.
  • the motion retarding stroke of the pit buffer assembly is greater than the buffer piston stroke.
  • An object of the present invention is to provide an improved elevator pit buffer.
  • the pit buffer is in particular, but not only, intended for elevators, especially for passenger or cargo elevators of buildings.
  • a roping herein is meant a cable, a belt, a rope or similar, or a combination of them.
  • the roping can comprise one or several individual cables, belts or ropes of different width, diameter and material.
  • a vertical movement path herein is meant the substantially vertical direction in which the elevator car and its counterweight move in alternating opposite directions between different levels served by the elevator.
  • a normal traveling range herein is meant the substantially vertical range of movement of the elevator car and the counterweight between those points that the elevator car and the counterweight are configured to reach, i.e. the lowest and highest landing levels served by the elevator.
  • An elevator pit herein is meant the part of the elevator shaft that is below the normal traveling range of the elevator car and the counterweight.
  • An elevator pit comprises at least a vertical support structure, typically a solid wall, and a floor. Its width can be determined independently of the width of the rest of elevator shaft.
  • a lateral location of the buffering structure is herein meant any position in the elevator pit, in which the buffering structure is not in the path of the elevator car or the counterweight even if one of them descends in to the elevator pit below its normal traveling range.
  • a pit buffer for an elevator pit above which an elevator car and a counterweight are intended to run, comprising a roping running across the vertical movement path of the elevator car and/or counterweight, the roping having two ends and each end being fixed to a stationary support, and a buffering structure comprising a cylinder and a co-working piston supporting the roping, the cylinder being configured to offer resistance to the retraction of the piston and located laterally to the vertical movement path of the elevator car and the counterweight, the piston configured to extend outside the cylinder when no force is exerted on the roping, and configured to retract inside the cylinder at least a distance when a force of at least predetermined magnitude is exerted on the roping, and a guiding structure, mounted on the end of the piston, over which the roping is configured to run, characterized in that a first end of the roping is attached at or above the point along the vertical movement path of the elevator car or the counterweight at which the elevator car or counterweight is configured to
  • an elevator comprising an elevator pit, an elevator car, a counterweight for the elevator car and a pit buffer, characterized in that it comprises a pit buffer according to the present disclosure.
  • the buffering structure is intended to be mounted at the bottom of the elevator pit, the elevator pit comprising at least a vertical support structure and a floor, the cylinder is configured to be fixed to the floor and the retracting movement of the piston is configured to be towards the floor.
  • the buffering structure is intended to be mounted at the bottom of the elevator pit, the elevator pit comprising at least the vertical support structure and the floor, and the first end of the roping is configured to be attached to the vertical support structure and the second end of the roping is configured to be attached to the cylinder or to the floor.
  • the guiding structure is a sliding block or a sheave.
  • the piston is supported by a guide shoe or a guide roller running on a supporting rail to increase the stability of the piston.
  • the pit buffer is configured to be used with an elevator car and/or a counterweight that comprises a catching construction to direct the path of the roping across the elevator car and/or counterweight.
  • the pit buffer comprises roping guides, and the roping runs through the roping guides that are configured to hold the roping in a predetermined position for receiving the elevator car or counterweight.
  • the pit buffer comprises a first roping intended for the elevator car, a second roping intended for the counterweight and one buffering structure that is used for both the elevator car and the counterweight.
  • the pit buffer further comprises a support bow fixed to a position above the guiding structure when the piston is in the extended position, and configured to keep the roping of the elevator car or the counterweight in place when force is exerted on the other roping retracting the piston into the cylinder and lowering the guiding structure.
  • the support bow is magnetic and the roping is made of ferromagnetic metal or embedded with ferromagnetic metal.
  • Fig. 1 presents a pit buffer 1 of an elevator in which the pit buffer 1 comprises a roping 2 and a buffering structure 5.
  • the buffering structure 5 comprises a cylinder 6, a piston 7, and a guiding structure 8 for the roping 2.
  • the pit buffer 1 of the elevator car 3 is depicted and the counterweight 4 and its pit buffer 1 are omitted.
  • the lowest floor level is marked with the line A-A' and the space below this level is called the elevator pit 9.
  • the buffering structure 5 has a structural length exceeding the depth of the elevator pit 9, exemplifying an advantage of the current disclosure in which the elevator pit 9 depth is not dependent on the structural length of the buffering structure 5.
  • An elevator car 3 is depicted to be at the lowest floor level, but all other elevator components, such as guide rails for the elevator car 3, hoisting cables and compensator assembly are omitted from the figure.
  • the first end of the roping 2 is attached to the elevator shaft 15 wall 16 at a point 18a that is above the level at which the elevator car 3 is configured to touch the roping 2.
  • the roping 2 attachment has to withstand the force exerted by the elevator car 3 on the roping 2 during deceleration by the pit buffer 1 and thus has to be sturdy enough. Many ways to construct such an attachment are possible, as is evident for a person skilled in the art.
  • the roping 2 runs through roping guides 14 that suspend the roping 2 in the appropriate position to receive the elevator car 3 if it passes below its normal traveling range.
  • the roping guides 14 are attached to the elevator shaft 15 wall 16, the buffering structure 5 or to other stable structures of the elevator pit 9.
  • Each roping guide 14 can comprise for example a rigid loop or a roller that directs the path of the roping 2 with minimal friction.
  • the roping guides 14 are positioned outside the movement path of the elevator car 3 so, that the elevator car 3 has room to pass them if it descends below its normal traveling range.
  • the design of the roping guides 14 depends on the material of the roping 2 and many solutions are evident for a person skilled in the art.
  • the roping 2 runs over a guiding structure 8 mounted at the extended end of the buffering structure 5.
  • the second end of the roping 2 is attached to the cylinder 6 part of the buffering structure 5 at a level 18b below the lowest point to which the guiding structure 8 is configured to retract.
  • the roping 2 could be attached to the elevator pit 9 wall 16, to the elevator pit 9 floor 10 or to any other stable enough structure within the elevator pit 9 at an appropriate height.
  • the strength requirements for the roping 2 attachment for the second end of the roping 2 are similar to those of the roping 2 attachment for the first end of the roping 2.
  • the roping 2 can be made of different materials, for example of metal cable or wire, nylon or polyester webbing, or the combination of such materials. Each material has different properties in respect to durability, flexibility, cost, fire resistance properties and the like. Therefore, the selection of material depends on the specifics of the elevator construction in question.
  • the buffering structure 5 is located laterally to the elevator car 3 and the counterweight 4. This means that the buffering structure 5 is not in the path of the elevator car 3 or the counterweight 4 even if one of them descends in to the elevator pit 9 below its normal traveling range.
  • the buffering structure 5 can thus be located anywhere in the elevator pit 9, as long as it is not below the elevator car 3 or the counterweight 4.
  • the buffering structure 5 comprises a cylinder 6, a piston 7, and the guiding structure 8.
  • the construction of the cylinder 6 and the piston 7 is as known in the art for hydraulic pit buffers and their design is evident for a person skilled in the art.
  • the guiding structure 8 mounted at the top of the buffering structure 5 is configured to convey the force exerted on the roping 2 to the piston 7.
  • the design of the guiding structure 8 depends on the material used for the roping 2. If the roping 2 is made of plastic-based belt, such as nylon, a sliding block 8 with a small radius of curvature might be sufficient, but in case of metal wires, a sheave or a roller 8 would be necessary.
  • the pit buffer 1 allows a supporting rail (not shown in the figure) to be built alongside the buffering structure 5, since the elevator car 3 does not descend on top of the buffering structure 5. Consequently, a non-retractable structure within the pit buffer 1 is possible.
  • the piston 7 would be slideably connected to the supporting rail through at least one guide shoe or a guide roller from its extended end stabilizing the piston 7 considerably.
  • the supporting rail could be attached either to the cylinder 6, elevator pit 9 floor 10 or to the elevator pit 9 wall 16 and have any design known in the art for such supporting rails.
  • the counterweight 4 has its own pit buffer 1
  • its structure is substantially identical to that of the pit buffer 1 of the elevator car 3.
  • the buffering structure 5 is constructed so, that the elevator car 3 will stop within a predetermined distance due to the resistance of the hydraulic fluid in the cylinder 6.
  • the counterweight 4 has its own pit buffer 1, it functions substantially identically to the pit buffer 1 of the elevator car 3.
  • the catching construction 13 can be either attached to or form an integral part of the elevator car 3 or the counterweight 4.
  • the catching construction 13 can be located at the lower edges of the elevator car 3 or the counterweight 4 to reduce abrasion directed at the roping 2, by the edges of the elevator car 3 or counterweight 4.
  • the catching construction 13 can be in the form of rollers or sliding blocks, depending on the material used for the roping 2. For example, rollers are not necessary if the roping 2 is made of easily slidable material, such as a belt with a nylon surface.
  • the catching construction 13 can be located on the underside of the elevator car 3 to guide the path of the roping 2 so, that the roping 2 does not touch the edges of the elevator car 3 or the counterweight 4.
  • Fig. 2A presents a pit buffer 1 in which a shared buffering structure 5 is used for the elevator car 3 and the counterweight 4.
  • the numbering of the structures visible in Fig. 2A follows that of Fig. 1 and only the relevant differences between the embodiments are described.
  • roping 2a, 2b there are two sets of roping 2a, 2b, each of them constructed as in the embodiment of Fig. 1 .
  • the roping 2a is configured to receive the elevator car 3 and the roping 2b the counterweight 4. They are both attached from their first end to the elevator shaft 15 wall 16 above the point 18a at which the elevator car 3 or counterweight 4 is configured to touch the roping 2a, 2b, but on different sides of the elevator shaft 15.
  • Their second end is attached to opposing sides of the cylinder 6 of the buffering structure 5 at a point 18b lower along the vertical movement path of the elevator car 3 or the counterweight 4 than the lowest point to which the guiding structure 8 is configured to retract.
  • the two sets of roping 2a, 2b run through roping guides 14 and over a shared guiding structure 8 mounted at the extended end of the buffering structure 5.
  • the guiding structure 8 is constructed as in the embodiment of Fig. 1 , except that each set of roping 2a, 2b has its own groove in the guiding structure 8.
  • the buffering structure 5 according to this embodiment can be supported with a supporting rail and at least one accompanying guide shoe or a guide roller.
  • the pit buffer 1 according to the embodiment of Fig. 2A further comprises a support bow 17 configured to hold one of the sets of roping 2a, 2b at its original height when the other set of roping 2a, 2b has pressed the guiding structure 8 downwards.
  • the roping 2a, 2b is made of or is embedded with ferromagnetic metal, and the support bow 17 is magnetic.
  • the arrows of opposing directions under the elevator car 3 and the counterweight 4 indicate their opposite alternating movement directions during the normal operation of the elevator.
  • Fig. 2B presents the pit buffer 1 of Fig. 2A in which the elevator car 3 has descended below its normal traveling range and is being decelerated by the pit buffer 1, and the roping 2a of the elevator car 3 presses the piston 7 of the buffering structure 5 downwards.
  • the support bow 17 holds the roping 2b of the counterweight 4 at its original height thus preventing it from loosening.
  • the roping 2a of the elevator car 3 is in contact with the catching construction 13, which in this embodiment are sliding blocks, but could alternatively be rollers or other friction- or abrasion-reducing devices.
  • the arrows below the elevator car 3 and the counterweight 4 indicate their movement direction in Fig. 2B .

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  • Maintenance And Inspection Apparatuses For Elevators (AREA)
EP13175910.2A 2013-07-10 2013-07-10 Tampon de cuvette d'ascenseur Withdrawn EP2824055A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13175910.2A EP2824055A1 (fr) 2013-07-10 2013-07-10 Tampon de cuvette d'ascenseur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13175910.2A EP2824055A1 (fr) 2013-07-10 2013-07-10 Tampon de cuvette d'ascenseur

Publications (1)

Publication Number Publication Date
EP2824055A1 true EP2824055A1 (fr) 2015-01-14

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ID=48782976

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EP13175910.2A Withdrawn EP2824055A1 (fr) 2013-07-10 2013-07-10 Tampon de cuvette d'ascenseur

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EP (1) EP2824055A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114955795A (zh) * 2021-02-23 2022-08-30 上海三菱电梯有限公司 电梯升降组件及电梯系统
CN114955786A (zh) * 2021-02-23 2022-08-30 上海三菱电梯有限公司 电梯缓冲装置与电梯系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US751504A (en) * 1904-02-09 Means for arresting elevator-cars
US5195616A (en) 1992-07-15 1993-03-23 Otis Elevator Company One to two stroke roped elevator pit buffers
CN2195535Y (zh) * 1994-04-28 1995-04-26 索双富 立井过放安全保护装置
JP2007197138A (ja) * 2006-01-25 2007-08-09 Hitachi Ltd エレベータの緩衝装置
CN202208584U (zh) * 2011-01-27 2012-05-02 北京升华电梯集团有限公司 一种电梯缓冲装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US751504A (en) * 1904-02-09 Means for arresting elevator-cars
US5195616A (en) 1992-07-15 1993-03-23 Otis Elevator Company One to two stroke roped elevator pit buffers
CN2195535Y (zh) * 1994-04-28 1995-04-26 索双富 立井过放安全保护装置
JP2007197138A (ja) * 2006-01-25 2007-08-09 Hitachi Ltd エレベータの緩衝装置
CN202208584U (zh) * 2011-01-27 2012-05-02 北京升华电梯集团有限公司 一种电梯缓冲装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114955795A (zh) * 2021-02-23 2022-08-30 上海三菱电梯有限公司 电梯升降组件及电梯系统
CN114955786A (zh) * 2021-02-23 2022-08-30 上海三菱电梯有限公司 电梯缓冲装置与电梯系统
CN114955786B (zh) * 2021-02-23 2023-12-05 上海三菱电梯有限公司 电梯缓冲装置与电梯系统

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