EP2571801A1 - Improvement of a suspension and safety stop system for a cabin of an elevator without counterweight - Google Patents

Improvement of a suspension and safety stop system for a cabin of an elevator without counterweight

Info

Publication number
EP2571801A1
EP2571801A1 EP11731091A EP11731091A EP2571801A1 EP 2571801 A1 EP2571801 A1 EP 2571801A1 EP 11731091 A EP11731091 A EP 11731091A EP 11731091 A EP11731091 A EP 11731091A EP 2571801 A1 EP2571801 A1 EP 2571801A1
Authority
EP
European Patent Office
Prior art keywords
assembly
cabin
carriage
fixed
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.)
Granted
Application number
EP11731091A
Other languages
German (de)
French (fr)
Other versions
EP2571801B1 (en
Inventor
Omar Galli
Marco Hoerler
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 EP2571801A1 publication Critical patent/EP2571801A1/en
Application granted granted Critical
Publication of EP2571801B1 publication Critical patent/EP2571801B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • B66B11/0065—Roping
    • B66B11/008—Roping with hoisting rope or cable operated by frictional engagement with a winding drum or sheave

Definitions

  • the present invention relates to the field of elevators.
  • the invention relates in particular to an improvement of a suspension and safety stop system for the cabin of an elevator of the self-supporting type without counterweight.
  • an elevator needs to be equipped with a safety brake suitable to stop the cabin in the event of overspeed or in any case of malfunction.
  • Said safety system is commonly known as "parachute" brake.
  • parachute brake In the event of intervention of said parachute brake the cabin is halted in a virtually instantaneous manner and the kinetic energy of the moving mass is released to the guide structure, causing a remarkable stress and/or strong vibrations. Moreover the onboard passengers are affected by the sharp stop.
  • the object of the present invention is to solve this problem.
  • the object in particular is to devise a system for avoiding that the intervention of the safety brake causes sharp stresses and/or vibrations on the cabin.
  • the cabin is suspended by a cable or belt by means of a unit known as carriage.
  • Said carriage essentially comprises a fixed assembly which is firmly attached to the cabin and an assembly which is elastically suspended to the fixed assembly, not being directly linked to the cabin.
  • At least one respective pulley or a respective set of pulleys are associated with said fixed assembly and with said suspended assembly of the carriage.
  • the suspension means is wound around said pulleys or sets of pulleys of the fixed assembly and of the suspended assembly.
  • the suspension means can be represented by one or more cables or belts. In a preferred embodiment said suspension means is represented by a belt.
  • the suspended assembly of the carriage is elastically connected to the fixed assembly by means of at least one spring or equivalent elastic means.
  • the two assemblies are connected by sliding pins contrasted by respective coaxial springs.
  • At least one shock-absorbing system is provided between said fixed assembly and said suspended assembly of the carriage.
  • the sharp stop of the cabin following an intervention of the parachute brake, tends to move the fixed assembly and the mobile assembly of the carriage away or towards each other, depending on the brake being operated while the cabin is descending or ascending, respectively.
  • the shock-absorbing system has a dampening function which makes the stopping of the cabin less sharp and prevents vibrations which are unpleasant for the users or which could be dangerous for the integrity of the suspension and guide system, causing permanent damage to vital parts of the elevator.
  • Fig. 1 shows schematically an elevator without counterweight, according to a preferred embodiment of the invention
  • Fig. 2 shows the detail "B" of the carriage of the elevator of Fig. 1 , in a lateral view
  • Fig. 3 shows a front view of the carriage of Fig. 2;
  • Figs. 4 and 5 show a variant of the invention with double shock absorber.
  • an elevator of the self-supporting type without counterweight which comprises a cabin 1 guided by a load-bearing structure represented essentially by lateral guides 2 connected by upper and lower crosspieces 2A, 2B.
  • the cabin 1 is suspended by a belt 3, wound around pulleys 4. More particularly the cabin 1 is suspended by a carriage 5 which supports some of the pulleys around which the belt 3 is wound.
  • the pulleys 4 are positioned in fixed and mobile sets. Fixed sets of pulleys are integral with the load-bearing structure and mobile sets are associated with the carriage 5, following the movement of the cabin 1. In the example two sets of fixed pulleys are associated respectively with the upper and lower crosspieces 2A, 2B and two sets of mobile pulleys are associated with the carriage 5.
  • each set are preferably coplanar in a plane parallel to the direction of the movement of the cabin. More preferably each set comprises a plurality of pulleys of different diameter and aligned by decreasing size, from a pulley of greater diameter to a pulley of smaller diameter, as represented in the drawings and in particular in Figs. 3 and 5.
  • the belt 3 is wound around the pulleys 4, between two fixed end points.
  • a motor (not shown) drives a drive pulley, for example one of the pulleys 4 of a fixed set integral with the crosspiece 2A or 2B.
  • the carriage 5 is shown in greater detail in Figs. 2 and 3.
  • the carriage 5 essentially comprises an assembly 5a associated with the cabin 1 and an assembly 5b which is elastically suspended to the assembly 5a, not being directly anchored to the cabin itself.
  • the fixed assembly 5a comprises a plate 6, attached to the rear wall of the cabin 1 .
  • Said plate 6 carries a first set of three coplanar pulleys 4 of decreasing diameter, as schematised in Fig. 3.
  • the suspended assembly comprises a plate 7 which carries another set of three coplanar pulleys 4 of decreasing diameter.
  • the plates 6 and 7 are connected by two pins 8A each contrasted by a coaxial spring 8, which is preloaded with a predetermined compression. In this way the system maintains an adequate tension of the belt 3 and acts as a compensation system.
  • the spring 8 opposes the plates 6 and 7 from moving away each other.
  • a shock-absorbing system connects the two assemblies 5a and 5b each other.
  • a shock- absorbing system 20 connects the fixed plate 6 to the suspended plate 7.
  • the shock-absorbing system 20 reacts with a force proportional to the relative speed which exists between the two plates 6 and 7, with the effect of dampening the vibrations of the springs 8.
  • said shock-absorbing system 20 is made with a cylinder 21 integral with the assembly 5b, and a piston 22 sliding in the cylinder 21 and having an end integral with the assembly 5a.
  • the travel of the piston 22 in the cylinder 21 is contrasted by an appropriate means (oil, gas or other) which provides the dampening effect.
  • Embodiments of the invention with more than one shock-absorbing system are possible.
  • two shock absorbers 20 are provided at the opposite sides of the carriage 5.
  • This configuration with double shock absorber is further advantageous because it provides a more accurate guide of the assembly 5b compared to the fixed assembly 5a and avoids the generation of a bending moment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
  • Cage And Drive Apparatuses For Elevators (AREA)

Abstract

Elevator comprising a fixed structure (2) and a cabin (1), a suspension system comprising at least one means of suspension (3) wound on pulleys (4) and a carriage (5) for driving said cabin (1), wherein said carriage comprises a fixed assembly (5a) integral with the cabin (1) and a suspended assembly (5b), and wherein there is at least one shock-absorbing system (20) between said fixed assembly and said suspended assembly of the carriage.

Description

Improvement of a suspension and safety stop system for a cabin of an elevator without counterweight
DESCRIPTION
The present invention relates to the field of elevators. The invention relates in particular to an improvement of a suspension and safety stop system for the cabin of an elevator of the self-supporting type without counterweight.
It is known that an elevator needs to be equipped with a safety brake suitable to stop the cabin in the event of overspeed or in any case of malfunction. Said safety system is commonly known as "parachute" brake. In the event of intervention of said parachute brake the cabin is halted in a virtually instantaneous manner and the kinetic energy of the moving mass is released to the guide structure, causing a remarkable stress and/or strong vibrations. Moreover the onboard passengers are affected by the sharp stop.
The object of the present invention is to solve this problem. The object in particular is to devise a system for avoiding that the intervention of the safety brake causes sharp stresses and/or vibrations on the cabin.
This object is achieved with an elevator without counterweight according to the attached independent claim 1. Some preferred embodiments are described in the dependent claims.
In a preferred embodiment the cabin is suspended by a cable or belt by means of a unit known as carriage. Said carriage essentially comprises a fixed assembly which is firmly attached to the cabin and an assembly which is elastically suspended to the fixed assembly, not being directly linked to the cabin. At least one respective pulley or a respective set of pulleys are associated with said fixed assembly and with said suspended assembly of the carriage. The suspension means is wound around said pulleys or sets of pulleys of the fixed assembly and of the suspended assembly. The suspension means can be represented by one or more cables or belts. In a preferred embodiment said suspension means is represented by a belt.
The suspended assembly of the carriage is elastically connected to the fixed assembly by means of at least one spring or equivalent elastic means. In an embodiment given as an example of the invention, the two assemblies are connected by sliding pins contrasted by respective coaxial springs.
According to the invention at least one shock-absorbing system is provided between said fixed assembly and said suspended assembly of the carriage. The sharp stop of the cabin, following an intervention of the parachute brake, tends to move the fixed assembly and the mobile assembly of the carriage away or towards each other, depending on the brake being operated while the cabin is descending or ascending, respectively. The shock-absorbing system has a dampening function which makes the stopping of the cabin less sharp and prevents vibrations which are unpleasant for the users or which could be dangerous for the integrity of the suspension and guide system, causing permanent damage to vital parts of the elevator.
Further advantages of the invention are: the compactness of the solution, the constructional simplicity and the reduced installation time. At each intervention of the parachute brake the shock-absorbing system absorbs the inertia and therefore the kinetic energy of the moving mass, protecting the constructional parts of the elevator. Thanks to the invention the stop caused by intervention of the parachute brake is less sharp and more tolerable by passengers, if any, on board the cabin.
These and other advantages of the invention will be made clearer herein below, with the aid of the description of some non-limiting preferred embodiments, in which:
Fig. 1 shows schematically an elevator without counterweight, according to a preferred embodiment of the invention;
Fig. 2 shows the detail "B" of the carriage of the elevator of Fig. 1 , in a lateral view;
Fig. 3 shows a front view of the carriage of Fig. 2;
Figs. 4 and 5 show a variant of the invention with double shock absorber.
Referring to the drawings, an elevator of the self-supporting type without counterweight is shown, which comprises a cabin 1 guided by a load-bearing structure represented essentially by lateral guides 2 connected by upper and lower crosspieces 2A, 2B. The cabin 1 is suspended by a belt 3, wound around pulleys 4. More particularly the cabin 1 is suspended by a carriage 5 which supports some of the pulleys around which the belt 3 is wound.
The pulleys 4 are positioned in fixed and mobile sets. Fixed sets of pulleys are integral with the load-bearing structure and mobile sets are associated with the carriage 5, following the movement of the cabin 1. In the example two sets of fixed pulleys are associated respectively with the upper and lower crosspieces 2A, 2B and two sets of mobile pulleys are associated with the carriage 5.
The pulleys of each set are preferably coplanar in a plane parallel to the direction of the movement of the cabin. More preferably each set comprises a plurality of pulleys of different diameter and aligned by decreasing size, from a pulley of greater diameter to a pulley of smaller diameter, as represented in the drawings and in particular in Figs. 3 and 5.
The belt 3 is wound around the pulleys 4, between two fixed end points. A motor (not shown) drives a drive pulley, for example one of the pulleys 4 of a fixed set integral with the crosspiece 2A or 2B.
The carriage 5, according to one of the embodiments of the invention, is shown in greater detail in Figs. 2 and 3. The carriage 5 essentially comprises an assembly 5a associated with the cabin 1 and an assembly 5b which is elastically suspended to the assembly 5a, not being directly anchored to the cabin itself. Referring more specifically to Fig. 2, the fixed assembly 5a comprises a plate 6, attached to the rear wall of the cabin 1 . Said plate 6 carries a first set of three coplanar pulleys 4 of decreasing diameter, as schematised in Fig. 3. The suspended assembly comprises a plate 7 which carries another set of three coplanar pulleys 4 of decreasing diameter. The plates 6 and 7 are connected by two pins 8A each contrasted by a coaxial spring 8, which is preloaded with a predetermined compression. In this way the system maintains an adequate tension of the belt 3 and acts as a compensation system. In particular the spring 8 opposes the plates 6 and 7 from moving away each other. According to the invention a shock-absorbing system connects the two assemblies 5a and 5b each other. In the example of Figs. 2 and 3 a shock- absorbing system 20 connects the fixed plate 6 to the suspended plate 7. The shock-absorbing system 20 reacts with a force proportional to the relative speed which exists between the two plates 6 and 7, with the effect of dampening the vibrations of the springs 8.
In Figs. 2 and 3 said shock-absorbing system 20 is made with a cylinder 21 integral with the assembly 5b, and a piston 22 sliding in the cylinder 21 and having an end integral with the assembly 5a. The travel of the piston 22 in the cylinder 21 is contrasted by an appropriate means (oil, gas or other) which provides the dampening effect.
Embodiments of the invention with more than one shock-absorbing system are possible. In another embodiment of the invention, shown in Figs. 4 and 5, two shock absorbers 20 are provided at the opposite sides of the carriage 5. This configuration with double shock absorber is further advantageous because it provides a more accurate guide of the assembly 5b compared to the fixed assembly 5a and avoids the generation of a bending moment.

Claims

1. Elevator without counterweight comprising a fixed structure (2) and a cabin (1), a suspension system comprising at least one suspension means (3) wound on pulleys (4) and a carriage (5) for driving said cabin (1), characterised in that: said carriage comprises a fixed assembly (5a) which is rigidly connected to the cabin and a suspended assembly (5b) which is elastically connected to said fixed assembly, wherein at least one respective pulley (4) is associated with said fixed assembly and at least one other respective pulley is associated with said mobile assembly of the carriage, and in that at least one shock-absorbing system (20) is interconnected between said fixed assembly and said suspended assembly of the carriage.
2. Elevator according to claim 1 , characterised in that said shock-absorbing system comprises at least one piston-cylinder shock absorber wherein the cylinder (21) is associated with one (5b) of said fixed assembly and suspended assembly, and the piston (22) is associated with the other (5a) of said fixed assembly and suspended assembly.
3. Elevator according to claim 1 or 2, wherein the fixed assembly comprises a plate (6) attached to a wall of the cabin and said plate supports a set of said pulleys; the mobile assembly comprises a second plate (7) which supports a second set of said pulleys, the two plates being connected elastically by at least one spring (8) and being moreover connected by said shock- absorbing system (20).
4. Elevator according to claim 1 , 2 or 3, wherein the carriage comprises two shock-absorbing systems at opposite sides of said carriage. Elevator according to any one of the previous claims, the suspension means being a belt.
EP11731091.2A 2010-05-17 2011-05-16 Improvement of a suspension and safety stop system for a cabin of an elevator without counterweight Not-in-force EP2571801B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH7782010A CH703168A2 (en) 2010-05-17 2010-05-17 Refinement of suspension and safety shutdown system for the cab of an elevator without counterweight.
PCT/IB2011/052140 WO2011145042A1 (en) 2010-05-17 2011-05-16 Improvement of a suspension and safety stop system for a cabin of an elevator without counterweight

Publications (2)

Publication Number Publication Date
EP2571801A1 true EP2571801A1 (en) 2013-03-27
EP2571801B1 EP2571801B1 (en) 2014-05-14

Family

ID=44628287

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11731091.2A Not-in-force EP2571801B1 (en) 2010-05-17 2011-05-16 Improvement of a suspension and safety stop system for a cabin of an elevator without counterweight

Country Status (3)

Country Link
EP (1) EP2571801B1 (en)
CH (1) CH703168A2 (en)
WO (1) WO2011145042A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19632850C2 (en) * 1996-08-14 1998-09-10 Regina Koester Traction sheave elevator without counterweight
FI120091B (en) * 2006-11-10 2009-06-30 Kone Corp Counterbalanced drive wheel lift
FI123730B (en) * 2006-11-10 2013-10-15 Kone Corp Arrangement in the elevator speed limiter
SE0700098L (en) * 2007-01-17 2008-07-18 Motala Hissar Ab Elevator drive device
CN102164840A (en) * 2008-09-30 2011-08-24 通力股份公司 Elevator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011145042A1 *

Also Published As

Publication number Publication date
WO2011145042A1 (en) 2011-11-24
EP2571801B1 (en) 2014-05-14
CH703168A2 (en) 2011-11-30

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