EP0385180B1 - Safety brake for a lift or the like - Google Patents

Safety brake for a lift or the like Download PDF

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Publication number
EP0385180B1
EP0385180B1 EP90102841A EP90102841A EP0385180B1 EP 0385180 B1 EP0385180 B1 EP 0385180B1 EP 90102841 A EP90102841 A EP 90102841A EP 90102841 A EP90102841 A EP 90102841A EP 0385180 B1 EP0385180 B1 EP 0385180B1
Authority
EP
European Patent Office
Prior art keywords
drum
pinion
heel
lever
rotation
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.)
Expired - Lifetime
Application number
EP90102841A
Other languages
German (de)
French (fr)
Other versions
EP0385180A2 (en
EP0385180A3 (en
Inventor
Mario Bertoncello
Roberto Bertoncello
Luciano Bertoncello
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.)
Maber costruzioni Srl
Original Assignee
MABER COSTRUZIONI Srl
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 MABER COSTRUZIONI Srl filed Critical MABER COSTRUZIONI Srl
Publication of EP0385180A2 publication Critical patent/EP0385180A2/en
Publication of EP0385180A3 publication Critical patent/EP0385180A3/en
Application granted granted Critical
Publication of EP0385180B1 publication Critical patent/EP0385180B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
    • B66B5/04—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed
    • B66B5/044—Mechanical overspeed governors

Definitions

  • the present invention relates to a safety stop device intended to be applied to a freight elevator or other lifting machine, both for people and for goods, said device being capable of instantly blocking the mobile equipment of the machine. in the event of a break in the pinion or its control mechanism.
  • This device can be applied either to single column lifts or to bridges with two or four columns.
  • the Swiss patent 556.464 which forms the basis for the division into two parts of the claim, provides that a roller 8 is pushed by the exagonal cam 1, by lowering the heel 6, which however is recalled to the rest position, before that the projection which follows comes at the level of the heel.
  • Document EP 0338613 provides a roller 54 subjected to the action of return springs 62 having the same characteristic, similar to document EP 0279.144.
  • a friction coupling mechanism which allows the rotation of the drum only when the torque exceeds a preset and adjustable maximum limit.
  • the device according to the invention is defined in claim 1.
  • the invention provides that a pivoting lever, mounted on the mobile chassis of the freight elevator or the like, cooperates by means of a roller with a rotating drum made integral with the pinion which meshes with the fixed rack.
  • Appropriate cams provided on the drum tend to move the roller and its lever away from its wall against elastic return means, by bringing the rear heel of said lever closer to this wall.
  • the device can only be released by manual intervention, that is to say by lifting the heel to release it from the projections, of course after the fault has been repaired and the safety of the device has been restored.
  • the device comprises a rotating drum 1 on which are mounted two cams 2 and 3 of triangular shape, as well as profiled projections 4 and 5 which rotate with the drum 1.
  • a lever 6 which pivots at a fixed point 7 of the frame of the device is equipped with a roller 8 which rolls on the side wall of the cylindrical core of the aforementioned drum 1, lifting up during the passage of each cam 2 and 3, and this against a return spring 9 , for example of the spiral type as clearly visible in fig. 2.
  • the whole assembly is mounted on a movable plate 10 secured to the freight elevator, by being provided with a pinion 11 which meshes with the rack 12.
  • This pinion 11 is integral with the rotating disc 13 which is engaged, with the interposition of friction linings 14 and 15, between fixed plates 16 and 17, the aforementioned linings 14 and 15 supporting the pressure exerted by return springs 18 which act on the plate 16 being mounted on tie rods 19 integral with the latter.
  • This plate is in turn fixed by welding against the drum 1 so as to rotate with the latter, while the rotating disc 13 is integral with the pinion 11.
  • the whole assembly is mounted on the mobile platform of an elevator, for example of a freight elevator 10 (fig. 3) which in the example shown without limitation includes two vertical columns 21 and 22 of which l at least one is integral with the rack 12 cooperating with the pinion 11 of the device supported by the aforementioned plate 10.
  • a freight elevator 10 for example of a freight elevator 10 (fig. 3) which in the example shown without limitation includes two vertical columns 21 and 22 of which l at least one is integral with the rack 12 cooperating with the pinion 11 of the device supported by the aforementioned plate 10.
  • the device can be applied to freight elevators or similar elevators comprising either a single column or on the contrary more than two columns, with the possibility in the latter case of using two or more of two racks which mesh with an equal number drive gears.
  • the dimensions of the device and in particular the power of the return springs 18 which act on the friction coupling mechanism must be related to the weight and to the dimensions of the mobile assembly of the elevator and special features of it.
  • FIGS. 1 and 2 The operation of the device is clearly shown in FIGS. 1 and 2 on which it can be noted that when the drum 1 rotates in the direction indicated by the arrow 24 of FIG. 1, the roller 8 mounted at the end of the lever 6 is raised by the cams 2 and 3 each time they are at the level of said roller, by lowering the heel 6 ′ of said lever 6 which nevertheless is brought back to the rest position by the spring 9 before the projection 4 comes itself at the heel 6 ′ mentioned above.
  • the heel 6 ′ strikes one of the projections 4 or 5 by instantaneously stopping the rotation of the drum 1 and thus opposing any movement of the mobile platform.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Types And Forms Of Lifts (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)
  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
  • Control And Safety Of Cranes (AREA)
  • Braking Arrangements (AREA)

Abstract

The safety locking mechanism for a lift or similar machine comprises a rotary drum (1) which is attached to the pinion of the rack and pinion drive mechanism and mounted on a plate. A roller (8) on the end of a lever (6) pivoted to the plate is held against the surface of the drum, which is equipped with cams (2,3) projecting from its surface. If the drum speed exceeds a set level the roller and lever are pushed away from the drum's surface, and a claw (6') connected to the lever engages with a projection (4,5) on the drum, locking the drum and pinion, so that the lift comes to a stop.

Description

La présente invention a pour objet un dispositif d'arrêt de sécurité destiné à être appliqué à un monte-charge ou autre engin élévateur, aussi bien pour personnes que pour marchandises, ledit dispositif étant propre à bloquer instantanément l'équipage mobile de l'engin en cas de rupture du pignon ou du mécanisme de commande de celui-ci.The present invention relates to a safety stop device intended to be applied to a freight elevator or other lifting machine, both for people and for goods, said device being capable of instantly blocking the mobile equipment of the machine. in the event of a break in the pinion or its control mechanism.

Ce dispositif peut être indiféremment appliqué à des ponts élévateurs à colonne unique ou à des ponts munis de deux ou quatre colonnes.This device can be applied either to single column lifts or to bridges with two or four columns.

On sait qu'à l'heure actuelle et tout particulièrement dans les monte-charges de service pour l'élévation de marchandises et parfois même de personnes, il est essentiel de prévoir un dispositif de sécurité qui assure l'arrêt du mécanisme élévateur et en conséquence de la plate-forme mobile de l'appareil, en cas de rupture de l'un des organes du mécanisme de commande de celui-ci, plus particulièrement du pignon qui assure généralement les mouvements de soulèvement et d'abaissement de la plate-forme en coopérant avec une crémaillère solidaire des parties fixes de l'engin.We know that at present and especially in service freight elevators for the lifting of goods and sometimes even of people, it is essential to provide a safety device which ensures the stopping of the lifting mechanism and consequence of the mobile platform of the apparatus, in the event of a rupture of one of the organs of the control mechanism thereof, more particularly of the pinion which generally ensures the movements of raising and lowering of the platform shape by cooperating with a rack integral with the fixed parts of the machine.

Les normes nationales et internationales actuellement en vigueur prescrivent de tels dispositifs de sécurité, surtout en vue de la sauvegarde des personnes.The national and international standards currently in force prescribe such safety devices, especially for the protection of people.

Le brévêt suisse 556.464, qui forme le base pour la division en deux parties de la revendication, prevoi qu'un galet 8 soit poussé par la camme exagonale 1, en abaissant le talon 6, qui toutefois est rappelé à la position de repos, avant que la saillie qui suit vient au niveau du talon.
Le document EP 0338613 prevoi un galet 54 soumis à l'action des ressort de rappel 62 ayant la même caracteristique, similement au document EP 0279.144.
Dans le dispositif de la presente invention on prévoit un mécanisme d'accouplement à friction qui autorize la rotation du tambour seulement lorsque la couple depasse une limite maximale pré-établie et réglable.The Swiss patent 556.464, which forms the basis for the division into two parts of the claim, provides that a roller 8 is pushed by the exagonal cam 1, by lowering the heel 6, which however is recalled to the rest position, before that the projection which follows comes at the level of the heel.
Document EP 0338613 provides a roller 54 subjected to the action of return springs 62 having the same characteristic, similar to document EP 0279.144.
In the device of the present invention there is provided a friction coupling mechanism which allows the rotation of the drum only when the torque exceeds a preset and adjustable maximum limit.

Le dispositif suivant l'invention est défini à la revendication 1.The device according to the invention is defined in claim 1.

En fait l'invention prévoit qu'un levier pivotant, monté sur le châssis mobile du monte-charge ou similaire, coopère par le moyen d'un galet avec un tambour tournant rendu solidaire du pignon qui engrène avec la crémaillère fixe. Des cames appropriées prévues sur le tambour tendent à éloigner de la paroi de celui-ci le galet et son levier à l'encontre de moyens élastiques de rappel, en rapprochant au contraire de cette paroi le talon arrière dudit levier.In fact, the invention provides that a pivoting lever, mounted on the mobile chassis of the freight elevator or the like, cooperates by means of a roller with a rotating drum made integral with the pinion which meshes with the fixed rack. Appropriate cams provided on the drum tend to move the roller and its lever away from its wall against elastic return means, by bringing the rear heel of said lever closer to this wall.

Lorsque le fonctionnement du monte-charge est normal, le talon précité se soulève en s'éloignant du tambour d'une valeur suffisante pour ne pas venir buter contre des saillies d'arrêt prévues sur celui-ci, ceci sous l'effet élastique du ressort de rappel.When the operation of the freight elevator is normal, the aforementioned heel is raised by moving away from the drum by a sufficient value so as not to come up against stop projections provided thereon, this under the elastic effect of the return spring.

Lorsque par contre, pour un motif quelconque dû à un incident qui empêche le bon fonctionnement du monte-charge, la plus grande vitesse de rotation du tambour interdit le retour normal en position de repos du levier qui porte le galet mobile, le talon est immédiatement contraint de venir contre l'une des saillies solidaires de ce tambour en bloquant la rotation de celui-ci et en arrêtant de la sorte le montecharge à la position dans laquelle il se trouve.When, on the other hand, for any reason due to an incident which prevents the proper functioning of the hoist, the greater speed of rotation of the drum prevents the normal return of the lever carrying the movable roller, the heel is immediately forced to come against one of the projections integral with this drum by blocking the rotation of the latter and thereby stopping the montecharge in the position in which it is located.

Le dispositif ne peut être débloqué que moyennant une intervention manuelle, c'est-à-dire en soulevant le talon pour le dégager des saillies, bien entendu après que la panne a été réparée et que la sécurité du dispositif a été rétablie.The device can only be released by manual intervention, that is to say by lifting the heel to release it from the projections, of course after the fault has been repaired and the safety of the device has been restored.

L'invention va maintenant être décrite de manière plus détaillée avec l'aide des planches de dessins annexées dans lesquelles :

  • La fig. 1 est une vue schématique en élévation du tambour tournant sur lequel agit le levier pivotant.
  • La fig. 2 est une vue de côté de ce tambour.
  • La fig. 3 représente de manière schématique, à simple titre d'exemple non limitatif, un monte-charge dont la plateforme mobile est équipée du dispositif de sécurité suivant l'invention.
The invention will now be described in more detail with the aid of the accompanying drawing plates in which:
  • Fig. 1 is a schematic elevation view of the rotating drum on which the pivoting lever acts.
  • Fig. 2 is a side view of this drum.
  • Fig. 3 schematically shows, simply by way of nonlimiting example, a freight elevator whose mobile platform is equipped with the safety device according to the invention.

Comme on peut le voir en fig. 1 et 2, le dispositif comprend un tambour tournant 1 sur lequel sont montées deux cames 2 et 3 de forme triangulaire, ainsi que des saillies profilées 4 et 5 qui tournent avec le tambour 1. Un levier 6 qui pivote en un point fixe 7 du bâti du dispositif est équipé d'un galet 8 qui roule sur la paroi latérale du noyau cylindrique du tambour 1 précité, en se soulevant lors du passage de chaque came 2 et 3, et ce à l'encontre d'un ressort de rappel 9, par exemple du type en spirale comme bien visible en fig. 2.As can be seen in fig. 1 and 2, the device comprises a rotating drum 1 on which are mounted two cams 2 and 3 of triangular shape, as well as profiled projections 4 and 5 which rotate with the drum 1. A lever 6 which pivots at a fixed point 7 of the frame of the device is equipped with a roller 8 which rolls on the side wall of the cylindrical core of the aforementioned drum 1, lifting up during the passage of each cam 2 and 3, and this against a return spring 9 , for example of the spiral type as clearly visible in fig. 2.

Tout l'ensemble est monté sur une plaque mobile 10 solidaire du monte-charge, en étant muni d'un pignon 11 qui engrène avec la crémaillère 12.The whole assembly is mounted on a movable plate 10 secured to the freight elevator, by being provided with a pinion 11 which meshes with the rack 12.

Ce pignon 11 est solidaire du disque tournant 13 qui est engagé, avec interposition de garnitures de friction 14 et 15, entre des plateaux fixes 16 et 17, les garnitures précitées 14 et 15 supportant la pression exercée par des ressorts de rappel 18 qui agissent sur le plateau 16 en étant montés sur des tirants 19 solidaires de ce dernier.This pinion 11 is integral with the rotating disc 13 which is engaged, with the interposition of friction linings 14 and 15, between fixed plates 16 and 17, the aforementioned linings 14 and 15 supporting the pressure exerted by return springs 18 which act on the plate 16 being mounted on tie rods 19 integral with the latter.

Ce plateau est à son tour fixé par soudure contre le tambour 1 de façon à tourner avec celui-ci, tandis que le disque tournant 13 est solidaire du pignon 11.This plate is in turn fixed by welding against the drum 1 so as to rotate with the latter, while the rotating disc 13 is integral with the pinion 11.

L'ensemble sus-décrit se présente en conséquence à la manière d'un système assurant la liaison entre le pignon 11 et le tambour tournant 1, en permettant à ce dernier de tourner dans un sens ou dans l'autre par rapport audit pignon 11 lorsque le couple moteur appliqué par ce pignon au tambour dépasse une limite de sécurité pré-établie et réglable.The above-described assembly is therefore presented in the manner of a system ensuring the connection between the pinion 11 and the rotating drum 1, by allowing the latter to rotate in one direction or the other with respect to said pinion 11 when the motor torque applied by this pinion to the drum exceeds a pre-established and adjustable safety limit.

Tout l'ensemble est monté sur la plate-forme mobile d'un élévateur, par exemple d'un monte-charge 10 (fig. 3) qui dans l'exemple représenté à titre non limitatif comporte deux colonnes verticales 21 et 22 dont l'une au moins est solidaire de la crémaillère 12 coopérant avec le pignon 11 du dispositif supporté par la plaque précitée 10.The whole assembly is mounted on the mobile platform of an elevator, for example of a freight elevator 10 (fig. 3) which in the example shown without limitation includes two vertical columns 21 and 22 of which l at least one is integral with the rack 12 cooperating with the pinion 11 of the device supported by the aforementioned plate 10.

Bien évidemment le dispositif peut être appliqué à des monte-charge ou similaires élévateurs comprenant indifféremment une seule colonne ou au contraire plus de deux colonnes, avec la possibilité dans ce dernier cas d'utiliser deux ou plus de deux crémaillères qui engrènent avec un nombre égal de pignons de commande.Obviously the device can be applied to freight elevators or similar elevators comprising either a single column or on the contrary more than two columns, with the possibility in the latter case of using two or more of two racks which mesh with an equal number drive gears.

Dans tous les cas on comprend que les dimensions du dispositif et en particulier la puissance des ressorts de rappel 18 qui agissent sur le mécanisme d'accouplement à friction doit être en rapport avec le poids et avec les dimensions de l'ensemble mobile de l'élévateur et des caractéristiques particulières de celui-ci.In all cases it is understood that the dimensions of the device and in particular the power of the return springs 18 which act on the friction coupling mechanism must be related to the weight and to the dimensions of the mobile assembly of the elevator and special features of it.

Le fonctionnement du dispositif ressort clairement des fig. 1 et 2 sur lesquelles on peut relever que lorsque le tambour 1 tourne dans le sens indiqué par la flèche 24 de fig. 1, le galet 8 monté à l'extrémité du levier 6 est soulevé par les cames 2 et 3 chaque fois que ces dernières se trouvent au niveau dudit galet, en abaissant le talon 6′ dudit levier 6 qui néanmoins est rappelé à la position de repos par le ressort 9 avant que la saillie 4 vienne elle-même au niveau du talon 6′ précité.The operation of the device is clearly shown in FIGS. 1 and 2 on which it can be noted that when the drum 1 rotates in the direction indicated by the arrow 24 of FIG. 1, the roller 8 mounted at the end of the lever 6 is raised by the cams 2 and 3 each time they are at the level of said roller, by lowering the heel 6 ′ of said lever 6 which nevertheless is brought back to the rest position by the spring 9 before the projection 4 comes itself at the heel 6 ′ mentioned above.

Toutefois, lorsque la vitesse de rotation du tambour dépasse une limite de sécurité pré-établie, par exemple par suite de la rupture du pignon 11 ou sous l'effet de toute autre cause accidentielle, le talon 6′ vient heurter l'une des saillies 4 ou 5 en arrêtant de manière instantanée la rotation du tambour 1 et en s'opposant de la sorte à tout déplacement de la plate-forme mobile.However, when the speed of rotation of the drum exceeds a pre-established safety limit, for example as a result of the rupture of the pinion 11 or under the effect of any other accidental cause, the heel 6 ′ strikes one of the projections 4 or 5 by instantaneously stopping the rotation of the drum 1 and thus opposing any movement of the mobile platform.

Seul un mouvement en sens inverse du pignon 11 permet de débloquer le dispositif en permettant à nouveau un déplacement quelconque de la plate-forme.Only a movement in the opposite direction of the pinion 11 enables the device to be unlocked by again allowing any movement of the platform.

Claims (1)

  1. Safety stop device for a goods lift or similar, comprising a rotary drum (1) mounted on the moving platform of the goods lift and rigidly joined to a pinion (11) which meshes with a rack (12) fixed on the stationary part of the goods lift or the like, to which platform is fixed a plate (10) on which the rotary drum (1) is mounted; a roller (8) provided on the end of a lever (6) mounted on a shaft integral with the plate (10) is held pressed against the wall of the drum (1), which features profiled cams (2 and 3) adapted to move the said roller (8) away from the drum against flexible means (9), causing the heel (6') of the said lever and the drum (1) to be brought together; the lever (6) has nonetheless returned to its rest position before the shoulder (4) rigidly joined to the drum (1) passes beneath the heel (6') when the drum (1) is rotating normally, whereas the said shoulder will come up against this heel (6') and lock the rotation of the device when the speed of rotation of the drum (1) exceeds a preset, adjustable limit or the flexible means are no longer able to raise the heel before the shoulder arrives, with the consequence that the rotation of the pinion (11) is arrested in whichever position it finds itself,
    characterised in that a disc (13) rigidly joined to the pinion is connected by the agency of two friction linings (14 and 15) to two plates (16 and 17) carried by the rotary drum (1), the connection between the disc (13) and the plates (16 and 17) being effected by the action of adjustable springs (18) mounted on tension rods (19) rigidly joined to the drum (1), thereby producing rotation of the drum which is constrained to move with the pinion when the torque acting thereon via the pinion does not exceed a maximum preset limit which can be adjusted via the springs.
EP90102841A 1989-03-02 1990-02-14 Safety brake for a lift or the like Expired - Lifetime EP0385180B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8985537A IT1233815B (en) 1989-03-02 1989-03-02 SAFETY STOP DEVICE FOR LOADERS OR SIMILAR.
IT8553789 1989-03-02

Publications (3)

Publication Number Publication Date
EP0385180A2 EP0385180A2 (en) 1990-09-05
EP0385180A3 EP0385180A3 (en) 1992-05-20
EP0385180B1 true EP0385180B1 (en) 1996-09-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP90102841A Expired - Lifetime EP0385180B1 (en) 1989-03-02 1990-02-14 Safety brake for a lift or the like

Country Status (4)

Country Link
EP (1) EP0385180B1 (en)
AT (1) ATE142598T1 (en)
DE (1) DE69028422T2 (en)
IT (1) IT1233815B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016184681A1 (en) 2015-05-15 2016-11-24 Maber Hoist Srl Safety stop mechanism

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5202539A (en) * 1991-08-28 1993-04-13 Inventio Ag Emergency brake apparatus for an elevator
IT1403056B1 (en) * 2010-12-09 2013-09-27 Maber Costruzioni S R L SHOCK ABSORBER TO BE APPLIED ON SAFETY STOP SYSTEMS OF LIFTS, LIFTS, PLATFORMS AND OTHER SIMILAR LIFTING EQUIPMENT.
CN117985566B (en) * 2024-04-03 2024-06-28 通用电梯股份有限公司 General type mechanical stopping device for elevator

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1118399A (en) * 1967-04-25 1968-07-03 Alimak Verken Aktiebolag Improvements in catch apparatus for the cages of scaffold elevators and the like
US3934682A (en) * 1972-11-23 1976-01-27 Hedstrom Ture E Safety device for lifts, hoists and like apparatus
CH556464A (en) * 1973-02-24 1974-11-29 Franzi Franco SAFETY DEVICE ALLOWING TO PREVENT THE FALL OF A LOAD INTENDED TO BE RAISED AND LOWERED WITH UNIFORM SPEED.
SE468089B (en) * 1988-04-22 1992-11-02 Alimak Ab DEVICE FOR SEARCH LIFT

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016184681A1 (en) 2015-05-15 2016-11-24 Maber Hoist Srl Safety stop mechanism

Also Published As

Publication number Publication date
IT1233815B (en) 1992-04-17
DE69028422D1 (en) 1996-10-17
ATE142598T1 (en) 1996-09-15
EP0385180A2 (en) 1990-09-05
EP0385180A3 (en) 1992-05-20
DE69028422T2 (en) 1997-04-03
IT8985537A0 (en) 1989-03-02

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