The present invention relates to an elevator and to an elevator stop block arrangement.
There are many different prior-art elevator safety devices that can be used to create a temporary safety space in an end portion of an elevator shaft. The commonest arrangement for accomplishing this is to use mechanical stop blocks arranged to stop the elevator car and prevent it from reaching the extremity of the elevator shaft. A proposed solution for implementing this is to use e.g. a mechanical stop block attached to the elevator shaft and arranged to be moved into the path of a mechanical stop block attached to the elevator car. There are also arrangements for providing a safe space for a serviceman above an elevator car where a stopper attached to the elevator car can be activated by the serviceman by temporarily moving the stopper into a position such that the stopper is set in alignment with a stopper provided in the elevator shaft. In the above-described solutions, the elevator car can only move until the mutually aligned stoppers meet, whereafter the elevator car is unable to move further. In this way, elevator car movement can be restricted for the time during which a serviceman is working e.g. on the top of the elevator car. Otherwise the serviceman would be exposed to the risk of being caught between the elevator car and the end of the elevator shaft. Prior-art technology is described in patent specifications EP1473264, EP1604934, EP1674416A1 and FR2795060A1, among others.
The problems encountered in prior-art solutions include the facts that each stopper has to be activated separately, the stoppers are difficult to activate from a landing door without stepping onto the top of the elevator car, the solutions are complicated and take up plenty of space, a separate limit switch must be provided for each movable stopper and the safety devices are slow and unsafe to activate.
The object of the invention is to overcome i.a. the abovementioned drawbacks of prior-art solutions and to produce an elevator with improved safety equipment and an improved stop block arrangement for an elevator. The aim of the invention is to achieve one or more of the following advantages, among others:
Inventive embodiments are presented in the description part and drawings of the present application. The inventive content disclosed in the application can also be defined in other ways than is done in the claims below. The inventive content may also consist of several separate inventions, especially if the invention is considered in the light of explicit or implicit sub-tasks or with respect to advantages or sets of advantages achieved. In this case, some of the attributes contained in the claims below may be superfluous from the point of view of separate inventive concepts. The features of different embodiments of the invention may be applied in connection with other embodiments within the scope of the basic inventive concept.
The elevator of the invention comprises an elevator car, car guide rails on one side of the elevator car, an elevator shaft or equivalent, at least one stop block attached to the car guide rails or to the elevator shaft or equivalent, at least two movable stop blocks attached to the elevator car, the latter stop blocks being arranged to be moved transversely relative to the elevator shaft into a position aligned with at least one stop block attached to the car guide rails or elevator shaft or equivalent and away from said aligned position. The aforesaid at least two movable stop blocks attached to the elevator car are connected to each other by a horizontal synchronizing element, preferably a shaft, connected to the stop blocks, said element being oriented substantially in a direction parallel with the elevator car wall on the side facing the car guide rails, to synchronize the motion of the movable stop blocks. With this arrangement, efficient space utilization and a safe structure capable of fast operation are achieved. In addition, as the guide rails and safety device are disposed on one side of the transverse cross-section of the elevator shaft as far as possible, there remains, at least on one side of the area on the top of the elevator car, free space where safe working is possible. Thus, the safety device as well as many of the machine components causing danger are concentrated on one side of the car, so they can be observed simultaneously.
In an embodiment of the invention, the elevator comprises two car guide rails disposed on one side of the elevator car, each guide rail having a stop block attached to it, and the two movable stop blocks attached to the elevator car are arranged to be moved transversely relative to the elevator shaft into a position aligned with the aforesaid stop blocks attached to the car guide rails and away from said aligned position, which two movable stop blocks attached to the elevator car are connected to each other by a horizontal shaft oriented substantially in a direction parallel with the elevator car wall on the side facing the car guide rails to synchronize the motion of the movable stop blocks. The advantages include a simple, safe and compact structure. The stop blocks can inter alia be advantageously positioned interjacently with other elevator components.
In an embodiment of the invention, the stop blocks are arranged to be moved in a transverse direction of the elevator shaft towards the car guide rails to an activated position and in a direction away from the car guide rails to a deactivated position.
In an embodiment of the invention, the aforesaid at least two movable stop blocks attached to the elevator car are turnable about parallelly oriented fulcrums and fixedly connected to each other by a shaft, preferably a metal rod or metal tube, attached to the stop blocks and oriented in the same direction with the fulcrums of the stop blocks.
In an embodiment of the invention, the aforesaid at least two movable stop blocks attached to the elevator car are turnable about a horizontal fulcrum. This provides the advantage of fast, safe and simple activation, inter alia.
In an embodiment of the invention, the synchronizing shaft is coaxial with the fulcrums of the aforesaid at least two stop blocks attached to the elevator car. This provides the advantage that the safety device can be accommodated in a narrow space on the car.
In an embodiment of the invention, the aforesaid at least two stop blocks attached to the elevator car are placed on the top of the elevator car. This provides the advantage that the stop blocks can be activated easily and regardless of where in the shaft the elevator car is located.
In an embodiment of the invention, the aforesaid at least one stop block attached to the car guide rails or elevator shaft or equivalent is attached to the car guide rails. An advantage of this is that the stop block can be positioned at exactly the desired point in the elevator shaft.
In an embodiment of the invention, the aforesaid at least two stop blocks attached to the elevator car are arranged to be turned into their activated position by a swiveling motion over the fulcrum. This structure provides safety especially as regards the safety space above the elevator car, because in the event of a collision the stop blocks in the elevator shaft press the car stoppers towards the activated position.
In an embodiment of the invention, the elevator car comprises a buffer placed in the path of the aforesaid at least two stop blocks attached to the elevator car to limit their turning movement. One of the advantages of this is that, when hitting the fixed stopper, the movable stopper will not turn away from the active position.
In an embodiment of the invention, the aforesaid at least two turnable stop blocks attached to the elevator car are so mounted on the elevator car that the synchronizing shaft is between the elevator car and the elevator shaft and/or under the elevator car. With this arrangement, a space saving on the top of the elevator car and efficient space utilization in the transverse direction of the elevator shaft are achieved, inter alia.
In an embodiment of the invention, the aforesaid at least one stop block attached to the car guide rails or to the elevator shaft or equivalent comprises at least one adjustable stop block. This allows the stop blocks attached to the elevator car to be easily caused to meet the stop blocks in the elevator shaft simultaneously. In addition, this reduces the significance of small measurement errors in the mounting of the stop blocks, so the positions of the stop block mountings can be machined already in factory.
In an embodiment of the invention, the aforesaid at least one stop block attached to the car guide rails or to the elevator shaft or equivalent comprises a first stopper element and a second stopper element, these two stopper elements being movable relative to each other to allow adjustment of the mutual positions of the stopper elements. This structure is safe and permits fast adjustment of the stop block.
In an embodiment of the invention, the stop block comprises means for fastening the first and second elements so as to make them immovable relative to each other.
In an embodiment of the invention, the first element and the second stopper element comprise form-locking surfaces, such as e.g. cogged surfaces. The structure in question is safe and permits fast adjustment of the stop block.
In an embodiment of the invention, the stop block and/or buffer comprise/comprises an impact damper element made of elastic material, such as e.g. rubber. This reduces the effect of measurement errors and softens the impact.
In an embodiment of the invention, the elevator comprises two stop blocks attached to the car guide rails or elevator shaft or equivalent, of which two stop blocks only one is adjustable, which enables the number of complex structures to be kept small.
In an embodiment of the invention, the motor and the hoisting ropes are disposed on the same side of the elevator shaft as the car guide rails, preferably between the car guide rails. In this way, efficient space utilization and a one-sided structure are achieved, so a serviceman can safely work in the elevator car area opposite to the machine and safety device, where there is enough space.
In an embodiment of the invention, the elevator concerned is an elevator without counterweight. In this case, the stop blocks can be designed to smaller dimensions than in counterweighted elevators.
In an embodiment of the invention, the turnable shaft is mounted to be supported by the car frame, i.e. car sling, by at least one, preferably two horizontal beams of the car frame 16 preferably on the top of the car, said horizontal beam/beams being preferably oriented at right angles to said shaft. The advantages include a reliable support of the stop block in an impact situation. A further advantage is that the forces produced by the impact are distributed uniformly to the more solid structures and the risk of damage to the elevator car is reduced.
In an embodiment of the invention, at least part of the elevator hoisting ropes are guided to pass via an area which, in a first horizontal direction, is delimited between an outer wall of the elevator car and an inner surface of the elevator shaft and, in a second horizontal direction, between the two guide rails of the elevator car. The advantages include a compact and safe structure. The stopper structure and the synchronizing element are effectively distributed among the elevator components between the guide rails.
The stop block arrangement of the invention in an elevator, said elevator comprising an elevator car, car guide rails disposed on one side of the elevator car and an elevator shaft or equivalent, comprises two stop blocks placed separately at a distance from each other and secured on the side of the elevator car facing towards the car guide rails to the car guide rails or elevator shaft or equivalent, two movable stop blocks attached to the elevator car, the latter stop blocks being arranged to be moved transversely relative to the elevator shaft into a position aligned with the stop blocks attached to the car guide rails or elevator shaft or equivalent and away from said aligned position, which two movable stop blocks attached to the elevator car are connected to each other by synchronizing means to synchronize the motion of the aforesaid movable stop blocks. The advantages of this include the fact that the stop block arrangement is safe to use and efficient in respect of space utilization, because the stop blocks are disposed on the same side as the guide rails. In addition, when the stop blocks collide, the forces produced by the impact are distributed in an advantageous uniform manner on the elevator car.
In an embodiment of the invention, the synchronizing means comprise an elongated synchronizing element, preferably a horizontal shaft substantially oriented in a direction parallel to the elevator car wall on the side facing towards the car guide rails of the elevator car, said shaft being arranged to be turnable about a fulcrum. This provides the advantage that the arrangement is safe, because many of the machine components causing danger are concentrated on one side of the car, allowing them to be observed simultaneously.
In an embodiment of the invention, at least some of the ropes in the set of hoisting ropes of the elevator are guided to pass via an area which, in a first horizontal direction, is delimited between an outer wall of the elevator car and an inner surface of the elevator shaft and, in a second horizontal direction, between the two guide rails of the elevator car. The advantages include a compact and safe structure. The stopper structure and the synchronizing element are effectively distributed among the elevator components between the guide rails.
In the following, the invention will be described in detail by referring to embodiment examples and the attached drawings, wherein
The swinging motion of the stop blocks 7 can be advantageously limited by means of buffer parts 11 (not shown in
In the embodiment illustrated in
In the embodiment according to
The stop block 9 further comprises means (t1, t2, P, h1, h2) for fixing the first part A and the second part B immovably relative to each other. The first part A and the second part comprise each a form that permits form locking, said forms being counter pairs for each other. In the embodiment in
The elevator preferably comprises two stop blocks 9 adjustable in the manner described above. On the other hand, if structural simplicity is to be maximized, then it is preferable to adapt the elevator to comprise two stop blocks 9 secured to the car guide rails 3 or elevator shaft or equivalent 5, of which two stop blocks 9 only one is adjustable and thus e.g. comprises a first stopper element A and a second stopper element B, which first and second stopper elements are movable relative to each other so as to allow adjustment of their mutual positions. In this case, the two stop blocks 7 secured to the elevator car 1 can be adapted to meet the stop blocks 9 in the elevator shaft by adjusting only one adjustable stop block 9.
It is obvious to a person skilled in the art that the invention is not limited to the embodiments described above, in which the invention has been described by way of example, but that many variations and different embodiments of the invention are possible within the scope of the inventive concept defined in the claims presented below. Thus, the stop blocks may also be arranged to be movable transversely relative to the elevator shaft in other ways than those illustrated in the figures, e.g. in such a way that the horizontal shaft 10 disposed in the above-described manner in relation to the elevator car actuates stoppers turnable about a vertical axis or e.g. slider-type stoppers movable back-and-forth in a transverse direction of the elevator shaft. The motion of the stoppers and horizontal shaft may be transmitted e.g. by levers. An advantage provided by these solutions would be that identical safety devices could be used both above and below in the elevator shaft. It is also obvious that the arrangement illustrated inter alia in
Number | Date | Country | Kind |
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20071014 | Dec 2007 | FI | national |
This application is a Continuation of PCT International Application No. PCT/FI2008/000134 filed on Nov. 27, 2008, which claims the benefit of Patent Application No. 20071014 filed in Finland, on Dec. 21, 2007. The entire contents of all of the above applications is hereby incorporated by reference into the present application.
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Entry |
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FR2795060 English Translation.pdf. |
JP2005343579 English Translation.pdf. |
Number | Date | Country | |
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20100252369 A1 | Oct 2010 | US |
Number | Date | Country | |
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Parent | PCT/FI2008/000134 | Nov 2008 | US |
Child | 12818729 | US |