CA1156595A - Transport system for a stairway elevator - Google Patents
Transport system for a stairway elevatorInfo
- Publication number
- CA1156595A CA1156595A CA000368278A CA368278A CA1156595A CA 1156595 A CA1156595 A CA 1156595A CA 000368278 A CA000368278 A CA 000368278A CA 368278 A CA368278 A CA 368278A CA 1156595 A CA1156595 A CA 1156595A
- Authority
- CA
- Canada
- Prior art keywords
- drive wheel
- transport system
- guide rail
- side wall
- rail
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H19/00—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion
- F16H19/02—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion
- F16H19/04—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion comprising a rack
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B9/00—Kinds or types of lifts in, or associated with, buildings or other structures
- B66B9/06—Kinds or types of lifts in, or associated with, buildings or other structures inclined, e.g. serving blast furnaces
- B66B9/08—Kinds or types of lifts in, or associated with, buildings or other structures inclined, e.g. serving blast furnaces associated with stairways, e.g. for transporting disabled persons
- B66B9/0807—Driving mechanisms
- B66B9/0815—Rack and pinion, friction rollers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/26—Racks
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Automation & Control Theory (AREA)
- Structural Engineering (AREA)
- Types And Forms Of Lifts (AREA)
- Handcart (AREA)
- Escalators And Moving Walkways (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention provides in a transport system for a stairway elevator with a platform, seat, or the like used to accommodate a load as well as a drive system which is moved together with the load having at least one drive wheel that engages pinion-like in a notched rail arranged along the transport path and which matches the drive wheel, the improvement in which the meshing between the drive wheel and the notched rail is to a greatextent formed in such a manner as to be independent of direction.
The present invention provides in a transport system for a stairway elevator with a platform, seat, or the like used to accommodate a load as well as a drive system which is moved together with the load having at least one drive wheel that engages pinion-like in a notched rail arranged along the transport path and which matches the drive wheel, the improvement in which the meshing between the drive wheel and the notched rail is to a greatextent formed in such a manner as to be independent of direction.
Description
l 15BS9~
The present invention relates to a transport system for a stairway elevator havin~ a platform, seat, or the like that is used to accommodate the load as weIl as a drive system that moves with the load having at least one drive wheel that engages like a pinion in a notched rail that is arranged alon~ the path of the transportation system and which matches the drive wheel.
A number of already familiar transport systems are used for transporting or moving loads. In this connection, the so-called stairway elevators are achieving increasing importance;
these are intended to enable a handicapped person to negotiate a difference in level which is bridged by means of a stairway, using a device similar to an elevator. The handicapped person can be moved together with a wheel chair or else he or she can occupy a seat that is installed on the stairway elevator.
DE-OS 26 32 684 descr~bes a transportation system which in practise and under certain circumstances has proved to be entirely satisfactory for use in a stairway elevator. Using this familiar transport system it is possible to cope with three dimensional changes in direction and very sharp corners on the transportatlon path, characteristics which are nearly always required in a stairway elevator. Such changes in direction are brought about by the use of a tube in which a cable that is moved by a drive wheel is accommodated in such a manner as to be free of contact and which at the same time functions as a guide tube for the stairway elevator and which can bear the load. In order that the movement of the cable can be transmitted to the load that is to be moved the guide tube is provided with a continuous longitudinal slit through which a connector protrudes to the outside of the tube, this being secured to the cable and which can engage in a plate that bears the load. However, mention must be made of the fact that the cable is provided with slides at intervals along its length in order to ensure that the cable is ~uided within the ~uide tube in such a manner that no contact exists between these two elements.
In addition to the above mentioned advantage that very tight c~rners can be negotiated, which will be required, for example, in the case of spiral staircases, or stairways which continue through several stories, it is also advantageous that the actual drive is fixed to the drive wheel and does not move with the load. This means that the actual space requirement for the stairway elevat~r itself is kept to a minimum since the drive unit does not need to be installed on the elevator. This also eliminates the problem of arranging for a power supply to the "co-travelling drive" on the stairway elevator.
In practice however, these advantages are balanced out by some disadvantages. In particular, the friction o~ the slide elements on the inner wall of the guide tube causes some difficulties. Since this friction occurs primarily in curves, it will of course increase as the number of curves grows greater so that ever more powerful and thus more costly power units are required. In addition, the tractive effort increases so that for reasons of safety it is necessary to use stronger and more costly cables in the guide tube.
For this reason, stairway elevators have already been constructed in which no cable is used for transferring the motion and in which in place of this, the power unit "co-travels"
with the load. In a known transport system for such a stairway elevator a rail is laid-along the transport path with the notched rail, that is to say along the length of the stairway; the drive wheel, which is in the form a pinion, engages in this notched rail. It is obvious that using such a solution the friction in the drive system is completely independent of the length of the system and the number of curves in it. However, it is unfortunate that this advantage also entails the disadvantage that no sharp 115~595 curves can be ne~otiated u$in~ the notched rail. If, na~ely, the radius of the cu~ve ~s very small there is no more meshing on the notched rail at this point. For thls reason the notched rail must also be laid on the outer side of the stairway, that is to say on the wall side opposite the hand rail since the curves are extremely sharp on the inner thand rail) side. If after having reached one floor the second portion of the stairway is joined to the first portion of the s~airway the hand rail will as a rule turn through a very sharp curve through an angle of approximately 180. However, the notched rail cannot follow such sharp curves.
The resulting necessity of having to lay the notched rail that is so favourable because of the friction the fact that it has to be considered, on the outside of the stairway entails yet another disadvantage. Very frequently doors leading to various rooms are located on the outer side in the individual floors, however, both for practical reasons as well as for the resulting hazard it is not possible to allow the notched rail to pass the door openings at ground level. For this reason, the transportation route must of necessity be broken at these places. For this reason, the familiar transport system using a pinion and a notched rail can for the most part only be used for negotiating a single story and even this can only be done with the provision that the associated stairway is as far as is possible straight and describes no sharp curves. The familiar transport system thus cannot be used for stairways which extend over several floors.
In summary it can be said that the familiar conventional transport systems can be classified in two distinct types. The first type present no problem in the case of sharp curves as a result of the guide tube although friction does cause considerable difficulties. These difficulties can be eliminated using the second type which has a pinion and a notched rail however they do 115~59~
entail the disadvant~ge that the transport path can contain no sharp curves. Thus the problem rematns that the advantayes of the two different transport systems are mutually exclusive and that up to the present it has been impossible to combine them.
The present invention provides a transport system for a stairway elevat~r with which even sharp curves can be negotiated with friction that remains independent of the length of the path.
According to the present invention there is provided ln a transport system for a stairway elevator with a platform, seat, or the like used to accommodate a load as well as a drive system which is moved together with the load having at least one drive wheel that engages pinion-like in a notched rail arranged along the transport path and which matches the drive wheel, the improvement in which the meshing between the drive wheel and the notched rail is to a great extent formed in such a manner as to be independent of direction.
Thus, according t~ the present invention meshing between the drive wheel an-d the notched rod is such as to be largely independent of direction. The transportation system of the present invention results in a secure and positive transmission of force that is for all practical purposes completely independent of direction so that even very sharp curves can be negotiated.
In principal the point of departure is the basic concept of a transport system using a pinion and a notched rail, this being particularly favourable with regard to friction. However, the invention entails the not inconsiderable advantage that by taking such a system as a basis even the-sharp curves that are in practice required can also be negotiated, which is not possible using conventional transport systems having a pinion and a notched rail. As a result of the preferably spherical meshing that is e ~ 4 to a large e*~ independent of direction it has been possible ~t for the first time to lay the notched rail on the inner side V
of the statrw,ay and thus negotiate several stories continuously by using a notched rail and at the same time avoid the above-described disadvanta~es.
In a suitable configuration of the transport system of the present invention the notched rail is formed as the guide rail in the sense of the guide tube that has already been described above. Thus the advantages of both familiar transport systems can be combined with each other thereby and their disadvantages simultaneously avoided. The meshing according to the invention can be effected by spherical teeth on the drive wheel and appropriate circu~ar depressions in the guide rail.
These depressions are extended into slots in the areas of the curves. Another possibil~ty for the meshing is that the spherical teeth can be arranged on the guide rail, the drive wheel then being provided ~ith suitably shaped circular cutout portions.
The use of a further guide, which can in similar manner be formed as a rail in addition to the guide rail in a vertical plane and at a parallel distance from the guide rail is especially advantageous. In this manner a vertical side wall can be provided having on one side the platform which is used to accommodate the load and having on the other side the drive wheel, this being securely held by the two guides and guided along the transport path. In a particularly useful configuration, of the transportation system of the present invention the drive wheel is arranged above the upper guide rail thus bears the side wall and the load whereas the lower end of the side wall can rest'upon the lower guide, The drive wheel can also be arranged beneath the upper gulde rail and thus work from below with the guide rail in order to transmit force. In this case in a useful configuration the side wall is supported by at least 1 15~59~
one conical roller that rolls on the upper side of the upper guide rail. In addition it is advantageous that at least one conical roller is provided at the lower end of the side wall. The side wall resting horizontally on the lower guide through the medium of this roller.
According to the position of the load in each case, thus according to the position of the wheel chair on the platform of the side wall, the center of gravity will be adjusted, in most instances this will be d~splaced from the middle. This results in turning moments that must be taken up by the two parallel guide rails. This presents no problem in the rising or falling portions of the path although these turning moments can be effective in a prejudicial manner in the case of horizontal movement thereby resulting in the danger that the lower non-driven portion of the side plate can remain stationary thereby tilting the elevator in a dangerous manner. In order to provide assistance a useful configuration of the invention that the lower guide, at least on the horizontal sections engages with an auxillary drive wheel in the same way as the upper guide rail, this auxillary guide rail being coupled synchronously with the upper drive wheel and moves synchronously with it. In this manner, a safe and even motion is ensured even in the horizontal sectors.
The present invention will be further illustrated by way of the accompanying drawings, in which:-Fig. 1 is a simplified perspective drawing of astairway elevator accord~ng to one embodiment of the present invention;
~ igs. 2 and 3 are side and end views of a side wall of a stairway elevator configured witr.ou' a platform with a drive wheel arranged above the guide rail;
Figs. 4 and 5 are side and end views according to Figs.
The present invention relates to a transport system for a stairway elevator havin~ a platform, seat, or the like that is used to accommodate the load as weIl as a drive system that moves with the load having at least one drive wheel that engages like a pinion in a notched rail that is arranged alon~ the path of the transportation system and which matches the drive wheel.
A number of already familiar transport systems are used for transporting or moving loads. In this connection, the so-called stairway elevators are achieving increasing importance;
these are intended to enable a handicapped person to negotiate a difference in level which is bridged by means of a stairway, using a device similar to an elevator. The handicapped person can be moved together with a wheel chair or else he or she can occupy a seat that is installed on the stairway elevator.
DE-OS 26 32 684 descr~bes a transportation system which in practise and under certain circumstances has proved to be entirely satisfactory for use in a stairway elevator. Using this familiar transport system it is possible to cope with three dimensional changes in direction and very sharp corners on the transportatlon path, characteristics which are nearly always required in a stairway elevator. Such changes in direction are brought about by the use of a tube in which a cable that is moved by a drive wheel is accommodated in such a manner as to be free of contact and which at the same time functions as a guide tube for the stairway elevator and which can bear the load. In order that the movement of the cable can be transmitted to the load that is to be moved the guide tube is provided with a continuous longitudinal slit through which a connector protrudes to the outside of the tube, this being secured to the cable and which can engage in a plate that bears the load. However, mention must be made of the fact that the cable is provided with slides at intervals along its length in order to ensure that the cable is ~uided within the ~uide tube in such a manner that no contact exists between these two elements.
In addition to the above mentioned advantage that very tight c~rners can be negotiated, which will be required, for example, in the case of spiral staircases, or stairways which continue through several stories, it is also advantageous that the actual drive is fixed to the drive wheel and does not move with the load. This means that the actual space requirement for the stairway elevat~r itself is kept to a minimum since the drive unit does not need to be installed on the elevator. This also eliminates the problem of arranging for a power supply to the "co-travelling drive" on the stairway elevator.
In practice however, these advantages are balanced out by some disadvantages. In particular, the friction o~ the slide elements on the inner wall of the guide tube causes some difficulties. Since this friction occurs primarily in curves, it will of course increase as the number of curves grows greater so that ever more powerful and thus more costly power units are required. In addition, the tractive effort increases so that for reasons of safety it is necessary to use stronger and more costly cables in the guide tube.
For this reason, stairway elevators have already been constructed in which no cable is used for transferring the motion and in which in place of this, the power unit "co-travels"
with the load. In a known transport system for such a stairway elevator a rail is laid-along the transport path with the notched rail, that is to say along the length of the stairway; the drive wheel, which is in the form a pinion, engages in this notched rail. It is obvious that using such a solution the friction in the drive system is completely independent of the length of the system and the number of curves in it. However, it is unfortunate that this advantage also entails the disadvantage that no sharp 115~595 curves can be ne~otiated u$in~ the notched rail. If, na~ely, the radius of the cu~ve ~s very small there is no more meshing on the notched rail at this point. For thls reason the notched rail must also be laid on the outer side of the stairway, that is to say on the wall side opposite the hand rail since the curves are extremely sharp on the inner thand rail) side. If after having reached one floor the second portion of the stairway is joined to the first portion of the s~airway the hand rail will as a rule turn through a very sharp curve through an angle of approximately 180. However, the notched rail cannot follow such sharp curves.
The resulting necessity of having to lay the notched rail that is so favourable because of the friction the fact that it has to be considered, on the outside of the stairway entails yet another disadvantage. Very frequently doors leading to various rooms are located on the outer side in the individual floors, however, both for practical reasons as well as for the resulting hazard it is not possible to allow the notched rail to pass the door openings at ground level. For this reason, the transportation route must of necessity be broken at these places. For this reason, the familiar transport system using a pinion and a notched rail can for the most part only be used for negotiating a single story and even this can only be done with the provision that the associated stairway is as far as is possible straight and describes no sharp curves. The familiar transport system thus cannot be used for stairways which extend over several floors.
In summary it can be said that the familiar conventional transport systems can be classified in two distinct types. The first type present no problem in the case of sharp curves as a result of the guide tube although friction does cause considerable difficulties. These difficulties can be eliminated using the second type which has a pinion and a notched rail however they do 115~59~
entail the disadvant~ge that the transport path can contain no sharp curves. Thus the problem rematns that the advantayes of the two different transport systems are mutually exclusive and that up to the present it has been impossible to combine them.
The present invention provides a transport system for a stairway elevat~r with which even sharp curves can be negotiated with friction that remains independent of the length of the path.
According to the present invention there is provided ln a transport system for a stairway elevator with a platform, seat, or the like used to accommodate a load as well as a drive system which is moved together with the load having at least one drive wheel that engages pinion-like in a notched rail arranged along the transport path and which matches the drive wheel, the improvement in which the meshing between the drive wheel and the notched rail is to a great extent formed in such a manner as to be independent of direction.
Thus, according t~ the present invention meshing between the drive wheel an-d the notched rod is such as to be largely independent of direction. The transportation system of the present invention results in a secure and positive transmission of force that is for all practical purposes completely independent of direction so that even very sharp curves can be negotiated.
In principal the point of departure is the basic concept of a transport system using a pinion and a notched rail, this being particularly favourable with regard to friction. However, the invention entails the not inconsiderable advantage that by taking such a system as a basis even the-sharp curves that are in practice required can also be negotiated, which is not possible using conventional transport systems having a pinion and a notched rail. As a result of the preferably spherical meshing that is e ~ 4 to a large e*~ independent of direction it has been possible ~t for the first time to lay the notched rail on the inner side V
of the statrw,ay and thus negotiate several stories continuously by using a notched rail and at the same time avoid the above-described disadvanta~es.
In a suitable configuration of the transport system of the present invention the notched rail is formed as the guide rail in the sense of the guide tube that has already been described above. Thus the advantages of both familiar transport systems can be combined with each other thereby and their disadvantages simultaneously avoided. The meshing according to the invention can be effected by spherical teeth on the drive wheel and appropriate circu~ar depressions in the guide rail.
These depressions are extended into slots in the areas of the curves. Another possibil~ty for the meshing is that the spherical teeth can be arranged on the guide rail, the drive wheel then being provided ~ith suitably shaped circular cutout portions.
The use of a further guide, which can in similar manner be formed as a rail in addition to the guide rail in a vertical plane and at a parallel distance from the guide rail is especially advantageous. In this manner a vertical side wall can be provided having on one side the platform which is used to accommodate the load and having on the other side the drive wheel, this being securely held by the two guides and guided along the transport path. In a particularly useful configuration, of the transportation system of the present invention the drive wheel is arranged above the upper guide rail thus bears the side wall and the load whereas the lower end of the side wall can rest'upon the lower guide, The drive wheel can also be arranged beneath the upper gulde rail and thus work from below with the guide rail in order to transmit force. In this case in a useful configuration the side wall is supported by at least 1 15~59~
one conical roller that rolls on the upper side of the upper guide rail. In addition it is advantageous that at least one conical roller is provided at the lower end of the side wall. The side wall resting horizontally on the lower guide through the medium of this roller.
According to the position of the load in each case, thus according to the position of the wheel chair on the platform of the side wall, the center of gravity will be adjusted, in most instances this will be d~splaced from the middle. This results in turning moments that must be taken up by the two parallel guide rails. This presents no problem in the rising or falling portions of the path although these turning moments can be effective in a prejudicial manner in the case of horizontal movement thereby resulting in the danger that the lower non-driven portion of the side plate can remain stationary thereby tilting the elevator in a dangerous manner. In order to provide assistance a useful configuration of the invention that the lower guide, at least on the horizontal sections engages with an auxillary drive wheel in the same way as the upper guide rail, this auxillary guide rail being coupled synchronously with the upper drive wheel and moves synchronously with it. In this manner, a safe and even motion is ensured even in the horizontal sectors.
The present invention will be further illustrated by way of the accompanying drawings, in which:-Fig. 1 is a simplified perspective drawing of astairway elevator accord~ng to one embodiment of the present invention;
~ igs. 2 and 3 are side and end views of a side wall of a stairway elevator configured witr.ou' a platform with a drive wheel arranged above the guide rail;
Figs. 4 and 5 are side and end views according to Figs.
2 and 3, with a drive wheel arranged beneath the upper guide rail;
Fi~s. 6 and 7 are side and end views according to Figs.
2 and 3, with the guide rail formed with spherical portions;
Fig. 8 is a plan view of a guide rail according to Fig. 7 thatin an arc shape;
Fia. 9 is a cross section of a portion of the drive wheel accordin~ to Fig. 7;
Figs. 10 and 11 are side and end views according to Figs. 2 and 3 with an upper guide rail configured as a tube and with a drive wheel arranged beneath the upper guide rail;
Fig. 12 is a detail of the guide rail according to Fig. 11; and Fig. 13 is a plan view of a guide rail according to Fig. 12 in an arc shape.
The stairway elevator 1 shown in Fig. 1 includes a side wall 2 as well as a drive system which is not illustrated in order to move the side wall 2 along the 2 guide rails 6 and 8, these being arranged on the inner side of the stairway. ~t its 2 B~ lower end the~Di~r~ 2 is provided with a platform 4 upon which a wheelchair (not shown) for a handicapped person may stand.
In order that the s'airway elevat~r 1 takes up as little room as possible when not in use, the platform 4 can be folded up into a position in which it is parallel to the side wall 2. For the remainder safety plates can be arranged at the forward and rear transverse sides of the platform 4, (these not being shown), it being possible to adjust thesè obliquely upwards in order to prevent a wheelchair located on the platform 4 rolling off the platform 4 accidently. These safety plates can be adjusted and brought into a horizontal position so that when a certain floor is reached the wheel chair can be moved off the platform 4.
The stairway elevat~r that is shown is provided with a so-called ~'co~tra~ellin~ drive"~ i.e, the drive srvstem is arranged directly on the stairway ele~ator 1. A cable drum can be provided in n alroady ~amili-- manner in order to supply energy to the power s~stem; however, this has proved to be some~hat less ~han suitable in practice. For this reason, in a useful manner a battery (not shown) is provided on the stairway elevat~r 1, this being used to provide energy to the drive system.
Finally, mention should be made of the fact that the controls, upwards or downwards, and stop, are arranged on the'upper end 10~ of the side wall 2 on the side facing the platform where they are readily accessible to a handicapped person located in a wheel-chair on the platform 4.
Further details of the stairway elevator described above are given below in which connection for reasons of clarity the platform 4 wh'ich is located at the lower end of the side wall 2 is not shown in remaining illustrations. In the embodiment of the invention accordlng to Fig. 2 and 3 the side wall 2 is ; guided by the upper guide rail 6 and the lower guide rail 8 in which connection the upper guide rail 6 bears the vertical load of the side wall 2 through the drive wheel 10 and thus carries ' this. It can be seen that driven drive wheel 10 and the upper guide rail 6 work together in the manner of a pinionand a guide rail. Unlike the formerly familiar arrangements meshing however, is to a large extent independent of direction this being achieved in this embodiment by the fact the round formed upper guide rail 6 like the lower guide rail 8 is providea on its upper side with spherical teeth 12 these engaging in the matching cutout portions 14 of the drive wheel 10 thus permitting a transfer of force that ls to a large extent independent of direction. The two guide rails 6 and 8, which, as is seen from Fig. 1, run along the total transport path parallel to each other can for this reason in an advantageous manner describe very sharp 115~59~
curves, this being impossible to achieve with conventional notched rails.
The drive wheel 10 that is provided with the circular cutout portions 14 is carried by an upper back plate 16, this being secured to the side wall 2 in such a manner as to rotate about an axle 18. In order to achieve safe guidance of the side wall 2 along the two guide rails 6 and 8 two conical rollers 20 are arranged on a lower back plate 22 through which the side wall 2 rests on a horizontal direction on the lower guide rail 8. By means of the rotatable mounting of the back plate 22 this placed in relation to the upper back plate 16 in a cutout portion of the side wall 2 means that the two conical rollers 20 can follow every chan~e in direction of the transport sector determined by the two guide ratls 6 and 8. This means that in each case a positive drive that can cope with curves is in each case ensured by means of the illustrated "tooth-meshing".
Unlike the above describe~versions~Figs. 4 and 5 show the drive wheel 10 beneath the upper guide rail 6 and thus the spherical teeth 12 are located on the under side of the guide rail 6. ~n this case, naturally, the drive wheel 10 cannot bear the side wall 2 and for this reason the two upper conical rollers 26 are provided, these lying on top of the guide rail 6 where they can roll. In order to be able to bear the load cau~ed by the side wall 2 safely, the two conical rollers 26 are arranged at an acute angle to the longitudinal axis of the side wall 2. As can be seen, the two conical rollers 26 are carried by a carrier 28 which is also secured to the upper back plate 16 in such a manner as to be able to rotate around the previously mentioned axle 18 on the side wall 2 so that the two conical rollers can roll on the upper guide rail 6 even when the angle of incline of the two guide rails changes. The lower end of the side wall 2 rests in the previously described manner over I lSB595 the two conica1 rollers 20 on the lower guide rail 8.
In a further exemplary version according to Figs. 6 and 7 meshing which is independent of direction is achieved by the fact that the upper guide rail 6 is provided with enlarged portions 32 which form the teeth and engage in correspondingly shaped cut-out portions 32 of the drive wheel 30. In the drawing the drive wheel 30 is arranged above the guide rail 6 and in this case it is expedient that a sliding guide is provided in the form of a ~hrust plate 36 the support of the lower area of the side wall 2 on the lower guide rail 8 is achieved in the previous-ly described manner through the two conical rollers 20. Of course in this exemplary version 2 it is possible for the drive wheel 30 to be arranged beneath the upper guide rail 6 when it must be ensured that the side wall 2 can be borne a suitably formed thrust plate arranged above the guide rail 6. Mention should also be made to the fact that the spherical enlarged portion 32 can be formed by spherical bodies fixed to the guide rail 6.
Figs. 8 and 9 clarifies the relationships that occur when the guide rails 6 and 8 describe a curve. The points of contact 40 between the spherical enlarged portions 32 and the drive wheel 30 are shaded. The center fully shaded ball transfers the turning moment o~ the drive wheel 30. If a constant radius curve is used for a change in direction and the throat angle A
is properly selected the shaded points of contact will result on the spheres that precede and follow and center sphere, these points of contact holding the drive wheel 30 laterally stable with the cut-out portions 34 and ensure a constant and even change in direction. It must be recognized that using this arrangement it is possible to describe relatively sharp curves so that the two guide rails 6 and 8 can be laid on the inner side of the sta~rway where expertence has shown that very sharp curves will llS~S9~ .
be required. The deeper inner curve the spheres adjacent to the center sphere engaae along the side shoulders the more they will assume the same direction. The converse applies that the further leave the sloped shoulders the more deviant the direction can be.
In any case using the described meshing it is possible to select the cut-out portions 34 of the drive wheel 30 and ~he spherical enlarged portions 32 in such a manner that on one hand the transfer of talk is guaranteed and on the other that there is sufficient lateral stability of the drive wheel 30 in the curves.
It must also be pointed out that Fig. 8 the area of sliding friction is numbered 50 and the area of rolling friction is number 38.
In the version shown in Fig. 10 and 11 the drive wheel 42 is provided with spherical teeth 44 and these engage in the depressions 46 of the guide rail 6 the later is here formed as a hollow tube so that the previously mentioned depressions 46 are formed by holes in the wall of the tube. Because the drive wheel 42 is located on the lower side of the guide rai`l 6 two conical rollers 26 are also provided here and these bear the side wall 2.
Naturally it is also possible here to arrange the drive wheel 42 above the upper guide rail 6 as is shown in Fig. 12.
~ ig. 13 shows the relationships in the curves with the version according to Fig. 12. As in Fig. 8, the points of contact 48 between the drive wheel 42 and the guide rail 6 are shaded.
The talk of the drive wheel 42 is transmitted by the middle completely shaded spherical teeth 44, whereas the points of contact of the immediately preceding and following teeth 44 provide the lateral stability of the drive wheel 42.
The basic principle of a spherical meshing that is to a great extent independent of direction underlies all the exemplary versions which have been described. This meshing is effected by means of round of spherical teeth that fit into 1~5~59~
suitable cut--out portions. Despite the possibility created thereby o permittin~ sharp cur~es in the transport path this also provides the i~portant advantage that friction that is ~enerated is completely independent of the length of the transport path and of the number of curves in it. Thus, a positive transfer of force makes it possible to negotiate several stories with a stairway elevator which is also characterized by quietness of operation.
The parallel guide rails 6 and 8 do not of course always follow an inclined path; ln many instances there are also horizontal stretches to be negotiated. It has been shown that the safe guiding of the stairway lift in a horizontal sector is frequently a cause for difficulties since the center of gravity of the arrangement is very often shifted from the middle accord-ing to the position of the wheel chair on the platform 4. This plays no role when the two guide rails are inclined; on the contrary, this frequently results in very good stability of the stairway lift 1. However, in the case of a horizontal stretch a danger may result that the lower undriven portion of the side plate 2 is inclined to remain stationary which will of course have a prejudicial effect. In order to eliminate this difficulty, according to further advantageous development of the invention, the lower guide rail 8 is also provided with spherical teeth or with cut-out portions in the same manner as the other guide rail, at least in the areas of horizontal stretch~s and is also provid-ed with an auxillary drive wheel so that there is also a drive on the lower ~uide rail 8. In order to achieve the synchronous and equal motion between the upper and the lower drive wheels that is necessary, they are both coupled at a ratio of 1 to 1 (this not bein~ shown in the illustrations). In this manner the stairway elevator 1 can also be kept stable on horizontal stretches.
~ h,e exemplary yersion shown in the drawings require in each case only ~n additional drive wheel 10~ 30 or 42 respectivel~, Naturally, it is also possible to use several drive wheels, For the remainder mention must also be made of the fact tha,t a new type of transport system can be used advantageously for a stairway lift but is not necessarily restricted to this. Thus, for example, it is also possible that transport systems can also be used in a monorail overhead railway or in a cog railway.
Finally, mention should be made of the fact that for reasons of clarity in the drawings, only the drive wheel and not the complete drive system is shown in the drawings.
!
, 30 I
Fi~s. 6 and 7 are side and end views according to Figs.
2 and 3, with the guide rail formed with spherical portions;
Fig. 8 is a plan view of a guide rail according to Fig. 7 thatin an arc shape;
Fia. 9 is a cross section of a portion of the drive wheel accordin~ to Fig. 7;
Figs. 10 and 11 are side and end views according to Figs. 2 and 3 with an upper guide rail configured as a tube and with a drive wheel arranged beneath the upper guide rail;
Fig. 12 is a detail of the guide rail according to Fig. 11; and Fig. 13 is a plan view of a guide rail according to Fig. 12 in an arc shape.
The stairway elevator 1 shown in Fig. 1 includes a side wall 2 as well as a drive system which is not illustrated in order to move the side wall 2 along the 2 guide rails 6 and 8, these being arranged on the inner side of the stairway. ~t its 2 B~ lower end the~Di~r~ 2 is provided with a platform 4 upon which a wheelchair (not shown) for a handicapped person may stand.
In order that the s'airway elevat~r 1 takes up as little room as possible when not in use, the platform 4 can be folded up into a position in which it is parallel to the side wall 2. For the remainder safety plates can be arranged at the forward and rear transverse sides of the platform 4, (these not being shown), it being possible to adjust thesè obliquely upwards in order to prevent a wheelchair located on the platform 4 rolling off the platform 4 accidently. These safety plates can be adjusted and brought into a horizontal position so that when a certain floor is reached the wheel chair can be moved off the platform 4.
The stairway elevat~r that is shown is provided with a so-called ~'co~tra~ellin~ drive"~ i.e, the drive srvstem is arranged directly on the stairway ele~ator 1. A cable drum can be provided in n alroady ~amili-- manner in order to supply energy to the power s~stem; however, this has proved to be some~hat less ~han suitable in practice. For this reason, in a useful manner a battery (not shown) is provided on the stairway elevat~r 1, this being used to provide energy to the drive system.
Finally, mention should be made of the fact that the controls, upwards or downwards, and stop, are arranged on the'upper end 10~ of the side wall 2 on the side facing the platform where they are readily accessible to a handicapped person located in a wheel-chair on the platform 4.
Further details of the stairway elevator described above are given below in which connection for reasons of clarity the platform 4 wh'ich is located at the lower end of the side wall 2 is not shown in remaining illustrations. In the embodiment of the invention accordlng to Fig. 2 and 3 the side wall 2 is ; guided by the upper guide rail 6 and the lower guide rail 8 in which connection the upper guide rail 6 bears the vertical load of the side wall 2 through the drive wheel 10 and thus carries ' this. It can be seen that driven drive wheel 10 and the upper guide rail 6 work together in the manner of a pinionand a guide rail. Unlike the formerly familiar arrangements meshing however, is to a large extent independent of direction this being achieved in this embodiment by the fact the round formed upper guide rail 6 like the lower guide rail 8 is providea on its upper side with spherical teeth 12 these engaging in the matching cutout portions 14 of the drive wheel 10 thus permitting a transfer of force that ls to a large extent independent of direction. The two guide rails 6 and 8, which, as is seen from Fig. 1, run along the total transport path parallel to each other can for this reason in an advantageous manner describe very sharp 115~59~
curves, this being impossible to achieve with conventional notched rails.
The drive wheel 10 that is provided with the circular cutout portions 14 is carried by an upper back plate 16, this being secured to the side wall 2 in such a manner as to rotate about an axle 18. In order to achieve safe guidance of the side wall 2 along the two guide rails 6 and 8 two conical rollers 20 are arranged on a lower back plate 22 through which the side wall 2 rests on a horizontal direction on the lower guide rail 8. By means of the rotatable mounting of the back plate 22 this placed in relation to the upper back plate 16 in a cutout portion of the side wall 2 means that the two conical rollers 20 can follow every chan~e in direction of the transport sector determined by the two guide ratls 6 and 8. This means that in each case a positive drive that can cope with curves is in each case ensured by means of the illustrated "tooth-meshing".
Unlike the above describe~versions~Figs. 4 and 5 show the drive wheel 10 beneath the upper guide rail 6 and thus the spherical teeth 12 are located on the under side of the guide rail 6. ~n this case, naturally, the drive wheel 10 cannot bear the side wall 2 and for this reason the two upper conical rollers 26 are provided, these lying on top of the guide rail 6 where they can roll. In order to be able to bear the load cau~ed by the side wall 2 safely, the two conical rollers 26 are arranged at an acute angle to the longitudinal axis of the side wall 2. As can be seen, the two conical rollers 26 are carried by a carrier 28 which is also secured to the upper back plate 16 in such a manner as to be able to rotate around the previously mentioned axle 18 on the side wall 2 so that the two conical rollers can roll on the upper guide rail 6 even when the angle of incline of the two guide rails changes. The lower end of the side wall 2 rests in the previously described manner over I lSB595 the two conica1 rollers 20 on the lower guide rail 8.
In a further exemplary version according to Figs. 6 and 7 meshing which is independent of direction is achieved by the fact that the upper guide rail 6 is provided with enlarged portions 32 which form the teeth and engage in correspondingly shaped cut-out portions 32 of the drive wheel 30. In the drawing the drive wheel 30 is arranged above the guide rail 6 and in this case it is expedient that a sliding guide is provided in the form of a ~hrust plate 36 the support of the lower area of the side wall 2 on the lower guide rail 8 is achieved in the previous-ly described manner through the two conical rollers 20. Of course in this exemplary version 2 it is possible for the drive wheel 30 to be arranged beneath the upper guide rail 6 when it must be ensured that the side wall 2 can be borne a suitably formed thrust plate arranged above the guide rail 6. Mention should also be made to the fact that the spherical enlarged portion 32 can be formed by spherical bodies fixed to the guide rail 6.
Figs. 8 and 9 clarifies the relationships that occur when the guide rails 6 and 8 describe a curve. The points of contact 40 between the spherical enlarged portions 32 and the drive wheel 30 are shaded. The center fully shaded ball transfers the turning moment o~ the drive wheel 30. If a constant radius curve is used for a change in direction and the throat angle A
is properly selected the shaded points of contact will result on the spheres that precede and follow and center sphere, these points of contact holding the drive wheel 30 laterally stable with the cut-out portions 34 and ensure a constant and even change in direction. It must be recognized that using this arrangement it is possible to describe relatively sharp curves so that the two guide rails 6 and 8 can be laid on the inner side of the sta~rway where expertence has shown that very sharp curves will llS~S9~ .
be required. The deeper inner curve the spheres adjacent to the center sphere engaae along the side shoulders the more they will assume the same direction. The converse applies that the further leave the sloped shoulders the more deviant the direction can be.
In any case using the described meshing it is possible to select the cut-out portions 34 of the drive wheel 30 and ~he spherical enlarged portions 32 in such a manner that on one hand the transfer of talk is guaranteed and on the other that there is sufficient lateral stability of the drive wheel 30 in the curves.
It must also be pointed out that Fig. 8 the area of sliding friction is numbered 50 and the area of rolling friction is number 38.
In the version shown in Fig. 10 and 11 the drive wheel 42 is provided with spherical teeth 44 and these engage in the depressions 46 of the guide rail 6 the later is here formed as a hollow tube so that the previously mentioned depressions 46 are formed by holes in the wall of the tube. Because the drive wheel 42 is located on the lower side of the guide rai`l 6 two conical rollers 26 are also provided here and these bear the side wall 2.
Naturally it is also possible here to arrange the drive wheel 42 above the upper guide rail 6 as is shown in Fig. 12.
~ ig. 13 shows the relationships in the curves with the version according to Fig. 12. As in Fig. 8, the points of contact 48 between the drive wheel 42 and the guide rail 6 are shaded.
The talk of the drive wheel 42 is transmitted by the middle completely shaded spherical teeth 44, whereas the points of contact of the immediately preceding and following teeth 44 provide the lateral stability of the drive wheel 42.
The basic principle of a spherical meshing that is to a great extent independent of direction underlies all the exemplary versions which have been described. This meshing is effected by means of round of spherical teeth that fit into 1~5~59~
suitable cut--out portions. Despite the possibility created thereby o permittin~ sharp cur~es in the transport path this also provides the i~portant advantage that friction that is ~enerated is completely independent of the length of the transport path and of the number of curves in it. Thus, a positive transfer of force makes it possible to negotiate several stories with a stairway elevator which is also characterized by quietness of operation.
The parallel guide rails 6 and 8 do not of course always follow an inclined path; ln many instances there are also horizontal stretches to be negotiated. It has been shown that the safe guiding of the stairway lift in a horizontal sector is frequently a cause for difficulties since the center of gravity of the arrangement is very often shifted from the middle accord-ing to the position of the wheel chair on the platform 4. This plays no role when the two guide rails are inclined; on the contrary, this frequently results in very good stability of the stairway lift 1. However, in the case of a horizontal stretch a danger may result that the lower undriven portion of the side plate 2 is inclined to remain stationary which will of course have a prejudicial effect. In order to eliminate this difficulty, according to further advantageous development of the invention, the lower guide rail 8 is also provided with spherical teeth or with cut-out portions in the same manner as the other guide rail, at least in the areas of horizontal stretch~s and is also provid-ed with an auxillary drive wheel so that there is also a drive on the lower ~uide rail 8. In order to achieve the synchronous and equal motion between the upper and the lower drive wheels that is necessary, they are both coupled at a ratio of 1 to 1 (this not bein~ shown in the illustrations). In this manner the stairway elevator 1 can also be kept stable on horizontal stretches.
~ h,e exemplary yersion shown in the drawings require in each case only ~n additional drive wheel 10~ 30 or 42 respectivel~, Naturally, it is also possible to use several drive wheels, For the remainder mention must also be made of the fact tha,t a new type of transport system can be used advantageously for a stairway lift but is not necessarily restricted to this. Thus, for example, it is also possible that transport systems can also be used in a monorail overhead railway or in a cog railway.
Finally, mention should be made of the fact that for reasons of clarity in the drawings, only the drive wheel and not the complete drive system is shown in the drawings.
!
, 30 I
Claims (19)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a transport system for a stairway elevator with a platform, seat, or the like used to accommodate a load as well as a drive system which is moved together with the load having at least one drive wheel that engages pinion-like in a notched rail arranged along the transport path and which matches the drive wheel, the improvement in which the meshing between the drive wheel and the notched rail is spherical meshing which is formed independent of direction of the elevator.
2. A transportation system according to claim 1, in which, one of said drive wheel and notched rail has spherical teeth with which meshing elements on the other of said drive wheel and notched rail mesh.
3. A transport system according to claim 1, in which the notched rail is formed by a guide rail that has circular depressions arranged on it in a longitudinal direction at intervals from each other and the drive wheel is provided with spherical teeth around its perimeter, said teeth engaging in said depressions.
4. A transport system according to claim 1, in which the notched rail is formed by a guide rail having approximately spherical teeth arranged along it in a longitudinal direction at intervals from each other and the drive wheel having circular cut-outs around its perimeter, said spherical teeth engaging in said cut-outs.
5. A transport system according to claim 4, in which the guide rail is provided with teeth in the form of spherical enlarged portions and the drive wheel has corresponding cut-out portions around its circumference, said enlarged portions engaging in these cut-out portions.
6. A transport system according to claim 3, in which the depressions in the areas in which the guide rail describes a curve are extended to slots in a radial direction to the curve.
7. A transport system according to claim 3, in which a lower guide is arranged parallel to and spaced from the guide rail in the vertical plane beneath the guide rail.
8. A transport system according to claim 7, in which a vertical side wall is provided having on its one side the platform that accommodates the load and on the other side at least one drive wheel and which is held and guided by the guide rail and the lower guide.
9. A transport system according to claim 8, in which the depressions or the teeth respectively are arranged on the lower side of the guide rail.
10. A transport system according to claim 8, in which at least one drive wheel is arranged beneath the guide rail.
11. A transport system according to claim 10, in which the side wall is provided with at least one conical roller which lies on the upper side of the guide rail whereby the side wall is supported.
12. A transport system according to claim 11, in which an axis of the conical roller is inclined at an acute angle to the vertical longitudinal access of the side wall.
13. A transport system according to claim 11, in which the conical roller is secured to a back plate which is mounted on the side wall so as to be able to rotate about an axis perpen-dicular to the vertical longitudinal axis of the side wall.
14. A transport system according to claim 8, in which at least one drive wheel having spherical cut-out portions is arranged above the guide rail and bears the side wall.
15. A transport system according to claim 14, in which a sliding guide is present as a thrust plate on the lower side of the guide rail that is opposite the drive wheel.
16, A transport system according to claim 8, in which a lower end of the side wall rests in a horizontal direction through at least one lower conical roller on the lower guide.
17. A transport system according to claim 16, in which a lower conical roller is secured to a lower back plate which is mounted so as to rotate about an axis perpendicular to the vertical longitudinal axis of the side wall.
18. A transport system according to claim 7, 8 or 9, in which the lower guide at least in horizontal portions is pro-vided in a manner similar to the guide rail with spherical teeth or spherical enlarged portions or with depressions respectively, and engages in a suitably formed auxillary drive wheel, that is coupled to the upper drive wheel and moves synchronously with it.
19. A transport system according to claim 6, 7 or 8, in which the guide rail with the depressions is a hollowed tube, the depressions being formed by holes in the walls of the tube.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3001298.7 | 1980-01-12 | ||
| DE19803001298 DE3001298A1 (en) | 1980-01-12 | 1980-01-12 | CONVEYOR SYSTEM FOR A STAIRLIFT |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1156595A true CA1156595A (en) | 1983-11-08 |
Family
ID=6092108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000368278A Expired CA1156595A (en) | 1980-01-12 | 1981-01-12 | Transport system for a stairway elevator |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0033294A3 (en) |
| CA (1) | CA1156595A (en) |
| DE (1) | DE3001298A1 (en) |
| DK (1) | DK10681A (en) |
| NO (1) | NO810087L (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5641040A (en) * | 1994-04-02 | 1997-06-24 | Thyssen Treppenlifte Gmbh | Drive for a freight elevator, in particular for a stair climber for the handicapped |
| CN105984784A (en) * | 2015-02-17 | 2016-10-05 | 韩燕� | Electric manned delivery equipment of escalator |
| CN111252645A (en) * | 2020-02-25 | 2020-06-09 | 马奔光 | Domestic manual stair elevating platform |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2174362A (en) * | 1983-02-17 | 1986-11-05 | Antony Stopher | Stairlift track |
| DE3334476A1 (en) * | 1983-09-21 | 1985-04-11 | César Arth Rigert | CONVEYING SYSTEM FOR OVERCOME DIFFERENCES |
| US4588048A (en) * | 1984-03-19 | 1986-05-13 | Economove Corporation | Four post lift and track adjusting means therefor |
| GB2157653A (en) * | 1984-04-17 | 1985-10-30 | Antony Stopher | A stair lift |
| IT1234715B (en) * | 1989-04-19 | 1992-05-26 | Vimec Srl | LIFT AND DESCALE SYSTEM STAIRS FOR DISABLED PEOPLE |
| DE4122855A1 (en) * | 1991-02-14 | 1992-08-20 | Hillenkoetter & Ronsieck | ELEVATOR, ESPECIALLY SLOPE ELEVATOR |
| AU650103B2 (en) * | 1991-03-20 | 1994-06-09 | Lyster, Ann Veronica | A stairlift |
| US5230405A (en) * | 1991-11-13 | 1993-07-27 | Michael Roman Bruno | Stairway chairlift device |
| NL1002545C2 (en) * | 1996-03-06 | 1997-03-11 | Traplift B V | Rail for stair-lift arrangement |
| FR2764024B1 (en) * | 1997-05-30 | 1999-08-13 | Antoine Curau | RACK OPENING DEVICE WITH POSSIBLE MISALIGNMENT |
| NL1013485C2 (en) | 1999-11-04 | 2001-05-07 | Freelift Bv | Stair guide. |
| DE10032745C2 (en) * | 2000-07-05 | 2002-09-05 | Gerd Grass | Stair lift for the disabled |
| US6310932B1 (en) * | 2000-10-23 | 2001-10-30 | Westinghouse Electric Company Llc | Fretting resistant spring design |
| EP1236671A1 (en) * | 2001-03-01 | 2002-09-04 | BC Lift A/S | Driving mechanism for a stairlift |
| EP1413541A1 (en) * | 2002-10-22 | 2004-04-28 | BC Lift A/S | Guide rail for a stairlift |
| CN103569136A (en) * | 2012-07-19 | 2014-02-12 | 南京林业大学 | Rail-mounted transport vehicle for stairs |
| CN104803260A (en) * | 2015-04-29 | 2015-07-29 | 陈长柱 | Transmission system of intelligent corridor ride-instead-of-walk elevator |
| CN109139870B (en) * | 2018-08-29 | 2020-06-12 | 诸暨市霞伟花木场 | Adjustable rack |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE165964C (en) * | ||||
| CH508507A (en) * | 1969-05-28 | 1971-06-15 | Von Roll Ag | Rack for a rail for overhead monorail |
| DE2123132C2 (en) * | 1971-05-11 | 1982-07-15 | Wilhelm Layher GmbH, 7129 Güglingen | Conveying device on scaffolding, in particular metal scaffolding |
| DE2556534A1 (en) * | 1975-12-16 | 1977-07-07 | Willy Habegger | Motor driven staircase lift - has transport truck on rack rail also acting as banister with side thrust rail underneath |
| DE2728260C2 (en) * | 1977-06-23 | 1985-04-11 | Erwin 3340 Wolfenbüttel Blüggel | Flexible splined shaft |
-
1980
- 1980-01-12 DE DE19803001298 patent/DE3001298A1/en not_active Ceased
-
1981
- 1981-01-09 EP EP81710002A patent/EP0033294A3/en not_active Withdrawn
- 1981-01-12 DK DK10681A patent/DK10681A/en not_active Application Discontinuation
- 1981-01-12 CA CA000368278A patent/CA1156595A/en not_active Expired
- 1981-01-12 NO NO810087A patent/NO810087L/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5641040A (en) * | 1994-04-02 | 1997-06-24 | Thyssen Treppenlifte Gmbh | Drive for a freight elevator, in particular for a stair climber for the handicapped |
| CN105984784A (en) * | 2015-02-17 | 2016-10-05 | 韩燕� | Electric manned delivery equipment of escalator |
| CN111252645A (en) * | 2020-02-25 | 2020-06-09 | 马奔光 | Domestic manual stair elevating platform |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0033294A3 (en) | 1981-11-11 |
| DK10681A (en) | 1981-07-13 |
| DE3001298A1 (en) | 1981-07-23 |
| NO810087L (en) | 1981-07-13 |
| EP0033294A2 (en) | 1981-08-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |