WO2003055780A1 - Elevator safety device comprising additional overspeed governor - Google Patents

Elevator safety device comprising additional overspeed governor Download PDF

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Publication number
WO2003055780A1
WO2003055780A1 PCT/FI2002/001017 FI0201017W WO03055780A1 WO 2003055780 A1 WO2003055780 A1 WO 2003055780A1 FI 0201017 W FI0201017 W FI 0201017W WO 03055780 A1 WO03055780 A1 WO 03055780A1
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WO
WIPO (PCT)
Prior art keywords
overspeed governor
safety device
additional
elevator
working platform
Prior art date
Application number
PCT/FI2002/001017
Other languages
French (fr)
Inventor
Michael KÖHNE
Original Assignee
Kone Corporation
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 Corporation filed Critical Kone Corporation
Priority to AU2002350778A priority Critical patent/AU2002350778A1/en
Publication of WO2003055780A1 publication Critical patent/WO2003055780A1/en

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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 device for an elevator as defined in the preamble of claim 1, especially for use during the installation of an elevator.
  • movable working platforms serving as moving scaffolds are used, which are suspended by hoisting ropes so as to allow them to be moved in the elevator shaft.
  • a working platform may consist of e.g. a temporary scaffold solution or an elevator car that will be used in the elevator system after installation.
  • the working platform is arranged to be movable along the elevator guide rails, which are installed one after the other end on end as the installation work is progressing while the working platform is raised along the guide rails in the shaft at the same time.
  • One of the problems with such a solution is the safety of the installers.
  • the brake of the hoisting apparatus alone is not considered to provide a sufficient safety level; instead, a separate safety gear solution is needed to prevent the working platform from falling down.
  • Patent specification US 5,052,523 discloses an overspeed governor mounted on the top of an elevator car.
  • the overspeed governor rope is fastened by its upper end to the ceiling of the elevator shaft while the lower end is connected to the floor via a tensioning device.
  • the rope of the overspeed governor is fitted to pass over an overspeed governor wheel on the top of the elevator car.
  • the overspeed governor comprises a separate reel on which the rope pulling the overspeed governor wedge is designed to be coiled up during the gripping action.
  • This solution is designed for final elevator operation, in the first place for elevators having no machine room, in which the overspeed governor could normally be mounted. This structure as such does not meet the installation-time need, so it involves the same problems that were described above.
  • the object of the invention is to eliminate the above- mentioned drawbacks and to achieve an economical installation- time safety device that is easy to install and meets the safety regulations and by means of which an elevator car or equivalent serving as a working platform can be quickly and reliably stopped.
  • the safety device of the invention is char- acterized by what is presented in the preamble of claim 1.
  • Other embodiments of the invention are characterized by what is presented in the other claims.
  • the solution of the invention provides the advantage that the safety device is implemented using an extra additional over- speed governor that makes it possible to stop the elevator car or equivalent used as a working platform from a lower falling speed and within a shorter distance of fall than normally. This improves the safety of installers.
  • the passengers stand in a closed elevator car, which is why a higher gripping speed and a longer falling distance are allowed.
  • installers work in difficult bodily postures and also on the top of the car.
  • an installer on the car top faces much greater peril than people standing inside an elevator car in normal operation traveling at the same speed. For this reason, the solution of the invention is very good expressly because of the safety it provides.
  • a further advantage is the fact that, being placed under the floor of the elevator car, the over- speed governor is not a hindrance for the installers during installation work.
  • An additional advantage is that the safety device of the invention also shortens the installation time, because before the elevator is taken into use as a finished installation, the extra overspeed governor only needs to be removed and the length of the safety gear rope adjusted for final application. No further installation work or adjustments are needed.
  • Yet another advantage is that the overspeed governor intended for normal use now functions as a back-up device, thus providing additional safety in case a malfunction of other fault should occur in the additional overspeed governor.
  • Fig. 1 illustrates simplified side view of a safety device solution according to the invention in an elevator shaft
  • Fig. 2 presents the additional overspeed governor used in the safety device solution of the invention in a more detailed view and seen obliquely from above.
  • an elevator car 1 used as a working platform is shown in a simplified form in an elevator shaft with the front wall opened, seen in side view.
  • the figure is a diagrammatic representation and is not in scale.
  • the elevator machine and the car suspension are also omitted from the drawings for the sake of clarity.
  • the elevator guide rails 2 in the figure are depicted as extending from the bottom of the shaft up to its ceiling, the elevator car 1 can be used as a working platform starting from an earlier installation stage when the guide rails 2 do not yet extend to the ceiling.
  • a normal overspeed governor 3 and its rope 4, which functions as a transmission means, is connected to a safety gear.
  • the overspeed governor rope 4 runs at the same speed with the elevator car. If the speed of the elevator car for some reason rises to level higher than a predetermined safety gear gripping speed, then the overspeed governor 3 will stop the rope 4 and, as a result of this, the rope will pull a safety gear 5 wedge provided in the elevator car structure into engagement with the guide rail 2, thus stopping the elevator car 1. The rope is pulled by means of an activating arm 6 of the safety gear 5, said arm being fastened to the rope 4.
  • the latter pulley 8 is piv- otally connected to the guide rail 2 so that a tensioning weight 9 attached to the outer end of the connecting arm always maintains a correct tension of the rope 4.
  • the above-described elevator ar- rangement is fitted with an additional overspeed governor 7 serving as a safety device, connected e.g. in series with the main overspeed governor 3.
  • This additional overspeed governor can be fixedly mounted either in the elevator shaft or on the elevator car.
  • the additional overspeed governor 7 is mounted on the elevator car functioning as a working platform, in a position immediately below the elevator car and near its bottom.
  • the safety gear rope 4 is fitted to pass via the additional overspeed governor 7, and the additional overspeed governor is adjusted to stop the motion of the safety gear rope 4 if its speed becomes too high.
  • the nominal speed of the additional over- speed governor 7 is e.g. 1.0 m/s, which means that it will stop the motion of the elevator car from a lower speed and within a shorter distance than in normal operation of a finished elevator, the required nominal speed for normal operation being e.g. 1.6 m/s.
  • Fig. 2 shows a more detailed illustration of how the safety gear rope 4 is passed over the diverting pulleys of the additional overspeed governor 7.
  • the rope 4 coming downwards from above is first diverted by a diverting pulley 11 and wraps around it on the bottom side in a separate rope groove and goes towards another diverting pulley 10, which is connected to a centrifugal overspeed governor element, which has been omitted from the drawings for the sake of clarity.
  • the rope 4 goes back to diverting pulley 11 and, running in another rope groove, wraps around this diverting pulley 11 on its top side and goes downwards to diverting pulley 8 below.
  • the additional overspeed governor is a common over- speed governor designed for normal operation.
  • the additional overspeed governor 7 mounted on the elevator car 1 serving as a working platform is connected to the normal safety gear rope 4 in such manner that the additional overspeed governor is connected to that vertical part of the rope loop 4 which runs on the opposite side of the overspeed governor 3 than that vertical part of the rope 4 to which the activating arm 6 of the safety gear 5 is connected.
  • the rope that drives the additional over- speed governor 7 runs in the opposite direction relative to the elevator car 1 serving as a working platform, and consequently the car speed as perceived by the additional over- speed governor 7 is twice the traveling speed of the elevator car.
  • the effective speed of the rope 4 on the overspeed governor 7 is thus twice the traveling speed of the elevator car. From this it follows that e.g. an overspeed governor with a nominal speed of 1.0 m/s will now operate at a speed of 0.5 m/s. Therefore, the distance through which the elevator car has fallen by the instant of gripping is shorter than in a normal gripping situation.
  • the in- vention is not limited to the example described above, but that it may be varied within the scope of the claims presented below.
  • the additional overspeed governor 7 may be e.g. fixedly mounted in the elevator shaft. A suitable place for it is e.g. on a elevator guide rail.
  • the suspension of the overspeed governor rope 4 may differ from that described in the example.

Abstract

The invention relates to a safety device designed especially for use during the installation of an elevator. The safety device comprises an overspeed governor (3) monitoring the speed of a working platform (1) used for installation work and a safety gear (5) connected to the overspeed governor by a rope (4) and designed to stop the working platform. In addition to the overspeed governor (3), the safety device comprises an additional overspeed governor (7) connected to the same rope (4) with the overspeed governor (3).

Description

ELEVATOR SAFETY DEVICE COMPRISING ADDITIONAL OVERSPEED GOVERNOR
The present invention relates to a safety device for an elevator as defined in the preamble of claim 1, especially for use during the installation of an elevator.
Today in most elevator installation projects, movable working platforms serving as moving scaffolds are used, which are suspended by hoisting ropes so as to allow them to be moved in the elevator shaft. Such a working platform may consist of e.g. a temporary scaffold solution or an elevator car that will be used in the elevator system after installation. Often the working platform is arranged to be movable along the elevator guide rails, which are installed one after the other end on end as the installation work is progressing while the working platform is raised along the guide rails in the shaft at the same time. One of the problems with such a solution is the safety of the installers. The brake of the hoisting apparatus alone is not considered to provide a sufficient safety level; instead, a separate safety gear solution is needed to prevent the working platform from falling down. Usually this need has been answered by using the overspeed governor and safety gear designed for the elevator in its final application, which are installed for temporary operation during installation. How- ever, the problem is that in normal operation higher gripping speeds are allowed for these devices than when they are used for working purposes during installation. Therefore, an over- speed governor designed for final application is not appropriate as such; instead, it has to be adjusted or else it has to be substituted by an overspeed governor whose stopping function is activated at a lower falling speed, for use during installation. A further problem in this case is that, after the completion of installation, re-installation and readjustment of the overspeed governor and safety gear are re- quired to adapt them to the designed traveling speed and nominal load of the elevator. At the same time, it is generally also necessary to renew the entire rope system of the over- speed governor. An additional problem is that re-installing the overspeed governor and safety gear arrangement involves a longer installation time.
Patent specification US 5,052,523 discloses an overspeed governor mounted on the top of an elevator car. In this solution, the overspeed governor rope is fastened by its upper end to the ceiling of the elevator shaft while the lower end is connected to the floor via a tensioning device. The rope of the overspeed governor is fitted to pass over an overspeed governor wheel on the top of the elevator car. In addition, the overspeed governor comprises a separate reel on which the rope pulling the overspeed governor wedge is designed to be coiled up during the gripping action. This solution is designed for final elevator operation, in the first place for elevators having no machine room, in which the overspeed governor could normally be mounted. This structure as such does not meet the installation-time need, so it involves the same problems that were described above.
The object of the invention is to eliminate the above- mentioned drawbacks and to achieve an economical installation- time safety device that is easy to install and meets the safety regulations and by means of which an elevator car or equivalent serving as a working platform can be quickly and reliably stopped. The safety device of the invention is char- acterized by what is presented in the preamble of claim 1. Other embodiments of the invention are characterized by what is presented in the other claims.
The solution of the invention provides the advantage that the safety device is implemented using an extra additional over- speed governor that makes it possible to stop the elevator car or equivalent used as a working platform from a lower falling speed and within a shorter distance of fall than normally. This improves the safety of installers. During normal opera- tion of a finished elevator, the passengers stand in a closed elevator car, which is why a higher gripping speed and a longer falling distance are allowed. By contrast, installers work in difficult bodily postures and also on the top of the car. Thus, if the elevator car used as a working platform suddenly falls, an installer on the car top faces much greater peril than people standing inside an elevator car in normal operation traveling at the same speed. For this reason, the solution of the invention is very good expressly because of the safety it provides. A further advantage is the fact that, being placed under the floor of the elevator car, the over- speed governor is not a hindrance for the installers during installation work. An additional advantage is that the safety device of the invention also shortens the installation time, because before the elevator is taken into use as a finished installation, the extra overspeed governor only needs to be removed and the length of the safety gear rope adjusted for final application. No further installation work or adjustments are needed. Yet another advantage is that the overspeed governor intended for normal use now functions as a back-up device, thus providing additional safety in case a malfunction of other fault should occur in the additional overspeed governor.
In the following, the invention will be described in detail by the aid of an example with reference to the attached drawings, wherein
Fig. 1 illustrates simplified side view of a safety device solution according to the invention in an elevator shaft, and Fig. 2 presents the additional overspeed governor used in the safety device solution of the invention in a more detailed view and seen obliquely from above.
In the solution illustrated in Fig. 1, an elevator car 1 used as a working platform is shown in a simplified form in an elevator shaft with the front wall opened, seen in side view. The figure is a diagrammatic representation and is not in scale. The elevator machine and the car suspension are also omitted from the drawings for the sake of clarity. Although the elevator guide rails 2 in the figure are depicted as extending from the bottom of the shaft up to its ceiling, the elevator car 1 can be used as a working platform starting from an earlier installation stage when the guide rails 2 do not yet extend to the ceiling. Mounted in the machine room or in some other suitable place in the elevator shaft is a normal overspeed governor 3, and its rope 4, which functions as a transmission means, is connected to a safety gear. In a normal operating situation of a finished elevator, the overspeed governor rope 4 runs at the same speed with the elevator car. If the speed of the elevator car for some reason rises to level higher than a predetermined safety gear gripping speed, then the overspeed governor 3 will stop the rope 4 and, as a result of this, the rope will pull a safety gear 5 wedge provided in the elevator car structure into engagement with the guide rail 2, thus stopping the elevator car 1. The rope is pulled by means of an activating arm 6 of the safety gear 5, said arm being fastened to the rope 4. The overspeed governor rope, or safety gear rope 4 as it is also called, forms a closed loop at whose upper extremity the rope 4 runs around the pulley of the overspeed governor 3 while at the lower extremity the rope 4 runs around a pulley 8 near the bottom of the elevator shaft. The latter pulley 8 is piv- otally connected to the guide rail 2 so that a tensioning weight 9 attached to the outer end of the connecting arm always maintains a correct tension of the rope 4.
According to the invention, the above-described elevator ar- rangement is fitted with an additional overspeed governor 7 serving as a safety device, connected e.g. in series with the main overspeed governor 3. This additional overspeed governor can be fixedly mounted either in the elevator shaft or on the elevator car. In the embodiment described in the example, the additional overspeed governor 7 is mounted on the elevator car functioning as a working platform, in a position immediately below the elevator car and near its bottom. The safety gear rope 4 is fitted to pass via the additional overspeed governor 7, and the additional overspeed governor is adjusted to stop the motion of the safety gear rope 4 if its speed becomes too high. The nominal speed of the additional over- speed governor 7 is e.g. 1.0 m/s, which means that it will stop the motion of the elevator car from a lower speed and within a shorter distance than in normal operation of a finished elevator, the required nominal speed for normal operation being e.g. 1.6 m/s.
Fig. 2 shows a more detailed illustration of how the safety gear rope 4 is passed over the diverting pulleys of the additional overspeed governor 7. The rope 4 coming downwards from above is first diverted by a diverting pulley 11 and wraps around it on the bottom side in a separate rope groove and goes towards another diverting pulley 10, which is connected to a centrifugal overspeed governor element, which has been omitted from the drawings for the sake of clarity. Having wrapped around diverting pulley 10 from its bottom side up- wards, the rope 4 goes back to diverting pulley 11 and, running in another rope groove, wraps around this diverting pulley 11 on its top side and goes downwards to diverting pulley 8 below. The additional overspeed governor is a common over- speed governor designed for normal operation.
According to the invention, the additional overspeed governor 7 mounted on the elevator car 1 serving as a working platform is connected to the normal safety gear rope 4 in such manner that the additional overspeed governor is connected to that vertical part of the rope loop 4 which runs on the opposite side of the overspeed governor 3 than that vertical part of the rope 4 to which the activating arm 6 of the safety gear 5 is connected. Thus, the rope that drives the additional over- speed governor 7 runs in the opposite direction relative to the elevator car 1 serving as a working platform, and consequently the car speed as perceived by the additional over- speed governor 7 is twice the traveling speed of the elevator car. The effective speed of the rope 4 on the overspeed governor 7 is thus twice the traveling speed of the elevator car. From this it follows that e.g. an overspeed governor with a nominal speed of 1.0 m/s will now operate at a speed of 0.5 m/s. Therefore, the distance through which the elevator car has fallen by the instant of gripping is shorter than in a normal gripping situation.
It is obvious to the person skilled in the art that the in- vention is not limited to the example described above, but that it may be varied within the scope of the claims presented below. Thus, for example, the placement and structure of the additional overspeed governor 7 may vary. The additional overspeed governor 7 may be e.g. fixedly mounted in the elevator shaft. A suitable place for it is e.g. on a elevator guide rail. Likewise, the suspension of the overspeed governor rope 4 may differ from that described in the example.

Claims

1. Safety device especially for use during the installation of an elevator, said safety device comprising an overspeed gover- nor (3) monitoring the speed of a working platform (1) used for installation work and a safety gear (5) connected to the overspeed governor by a transmission means, such as a rope
(4) , said safety gear being secured to the working platform (1) and designed to stop the working platform, characterized in that, in addition to the overspeed governor (3), the safety device comprises an additional overspeed governor (7).
2. Safety device according to claim 1, characterized in that the additional overspeed governor (7) is connected to the same rope (4) with the overspeed governor (3) and the safety gear
(5) .
3. Safety device according to claim 1 or 2 , characterized in that the additional overspeed governor (7) is connected in series with the overspeed governor (3) .
4. Safety device according to any one of the preceding claims, characterized in that the additional overspeed governor (7) is so mounted that it moves together with the working platform (1).
5. Safety device according to any one of the preceding claims, characterized in that the additional overspeed governor (7) is mounted on the vertically movable working platform (1), in a position below the working platform.
6. Safety device according to any one of the preceding claims, characterized in that the additional overspeed governor (7) is fixedly mounted in the elevator shaft .
7. Safety device according to any one of the preceding claims, characterized in that the additional overspeed governor (7) is fitted to react to a speed lower than in normal operation of a finished elevator and to stop the working platform (1) after a substantially shorter distance traveled at an overspeed than in the case of stopping a finished elevator during normal op- eration.
8. Safety device according to any one of the preceding claims, characterized in that the working platform (1) is an elevator car designed for use in normal operation of a finished eleva- tor.
9. Safety device according to any one of the preceding claims, characterized in that the additional overspeed governor (7) is connected to that vertical part of the rope (4) which runs on the opposite side of the overspeed governor (3) than that vertical part of the rope (4) to which the activating arm (6) of the safety gear (5) is connected.
PCT/FI2002/001017 2001-12-27 2002-12-13 Elevator safety device comprising additional overspeed governor WO2003055780A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002350778A AU2002350778A1 (en) 2001-12-27 2002-12-13 Elevator safety device comprising additional overspeed governor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20012578 2001-12-27
FI20012578A FI117239B (en) 2001-12-27 2001-12-27 Security device of an elevator

Publications (1)

Publication Number Publication Date
WO2003055780A1 true WO2003055780A1 (en) 2003-07-10

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PCT/FI2002/001017 WO2003055780A1 (en) 2001-12-27 2002-12-13 Elevator safety device comprising additional overspeed governor

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AU (1) AU2002350778A1 (en)
FI (1) FI117239B (en)
WO (1) WO2003055780A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8113319B2 (en) * 2003-11-24 2012-02-14 Kone Corporation Elevator and system and method for locking an elevator car in place
CN103339053A (en) * 2011-02-07 2013-10-02 奥的斯电梯公司 Elevator governor having two tripping mechanisms on separate sheaves
WO2017050857A1 (en) * 2015-09-25 2017-03-30 Inventio Ag Monitoring device for an elevator system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6138797A (en) * 1997-03-07 2000-10-31 Kone Corporation Procedure and apparatus for installing the overspeed governor of an elevator
US6202795B1 (en) * 1999-05-04 2001-03-20 Thyssen Ascenseurs Sas Automatic brakes for elevator car
EP1086921A1 (en) * 1999-03-17 2001-03-28 Mitsubishi Denki Kabushiki Kaisha Safety device of elevator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6138797A (en) * 1997-03-07 2000-10-31 Kone Corporation Procedure and apparatus for installing the overspeed governor of an elevator
EP1086921A1 (en) * 1999-03-17 2001-03-28 Mitsubishi Denki Kabushiki Kaisha Safety device of elevator
US6202795B1 (en) * 1999-05-04 2001-03-20 Thyssen Ascenseurs Sas Automatic brakes for elevator car

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8113319B2 (en) * 2003-11-24 2012-02-14 Kone Corporation Elevator and system and method for locking an elevator car in place
CN103339053A (en) * 2011-02-07 2013-10-02 奥的斯电梯公司 Elevator governor having two tripping mechanisms on separate sheaves
JP2014504580A (en) * 2011-02-07 2014-02-24 オーチス エレベータ カンパニー Elevator governor with two tripping mechanisms on individual sheaves
US9359173B2 (en) 2011-02-07 2016-06-07 Otis Elevator Company Elevator governor having two tripping mechanisms on separate sheaves
WO2017050857A1 (en) * 2015-09-25 2017-03-30 Inventio Ag Monitoring device for an elevator system
RU2717604C2 (en) * 2015-09-25 2020-03-24 Инвенцио Аг Elevator control device
US10781074B2 (en) 2015-09-25 2020-09-22 Inventio Ag Elevator car movement monitoring device, assembly device and assembly method for an elevator system

Also Published As

Publication number Publication date
AU2002350778A1 (en) 2003-07-15
FI20012578A0 (en) 2001-12-27
FI20012578A (en) 2003-06-28
FI117239B (en) 2006-08-15

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