The present invention relates to a guide rail fixing device for an elevator.
In an elevator hoistway, a pair of guide rails for guiding each of an elevator car and a counter weight to ascend and descend are installed over the entire ascending/descending range of the elevator car and the counter weight. Each guide rail is fixed to a beam or a wall-side bracket installed on a hoistway inner-wall with guide rail fixing devices each of which consists of a rail clip, a rail bracket, a bolt, a nut, and a spring washer (for example, Patent Document 1 and Patent Document 2).
Also, the guide rail installed in a high-rise building may be bent or bucked to deform, when there occurs heat shrinkage of steel frames of the building, concrete contraction due to its creep phenomena, or, interlayer displacement or uneven settlement caused by weight increase due to installation of air conditioners or the like. To deal with this problem, a guide rail fixing device is known (for example, Patent Document 3), with which the guide rail is fixed so that a space is provided between the lowest end of the guide rail and the bottom of the hoistway, to prevent the guide rail from deforming.
In a case where a conventional guide rail fixing device includes design errors in a guide rail or a rail clip, enough frictional force is sometimes not produced between the guide rail and the guide rail fixing device. In this case, when the building provided with an elevator is widely swung by an earthquake or a strong wind, the guide rail may fall.
If more guide rail fixing devices are installed to increase the number of spots for fixing the guide rails, the frictional force between the guide rail and the guide rail fixing devices can be increased. Considering, however, the fact that the guide rail fixing devices are fixed to beams or wall-side brackets installed on a hoistway inner-wall, the increased number of spots for fixing the guide rails raises the number of the beams or wall-side brackets to be installed on the hoistway inner-wall, resulting in a building installation cost.
The present invention is made to solve the problems described above and to provide a guide rail fixing device which can increase the frictional force against the guide rail without increasing the number of the beams or wall-side brackets to be installed on the hoistway inner-wall.
A guide rail fixing device according to the present invention includes: a rail bracket in contact with a bottom face of a base of a guide rail placed in a lowest portion out of guide rails arranged in line in an elevator hoistway; a first rail clip to clamp the base of the guide rail in cooperation with the rail bracket; and a friction plate which is in contact with the bottom face of the base of the guide rail placed in the lowest portion and in contact with an upper end of the rail bracket, the friction plate to clamp, in cooperation with a second rail clip, the base of the guide rail placed in the lowest portion.
According to the present invention, the frictional force between the guide rail and the guide rail fixing device can be increased without increasing the number of the beams or wall-aide brackets to be installed on the hoistway inner-wall.
Fishplates 8 are provided between the guide rails 4 to suppress vibration caused when the elevator car 2 or the counter weight 3 ascends or descends to pass through the level difference between the guide rails 4.
Also in the wall mounting method, similarly to the beam mounting method, the fishplates 8 are provided between the guide rails 4 to suppress vibration caused when the elevator car 2 or the counter weight 3 ascends or descends to pass through the level difference between the guide rails 4.
A guide rail fixing device 100 according to this embodiment will be explained by using
The guide rail 4 consists of a base 4a and a sliding part 4b extending vertically from the center of the base 4a, and forms a T-shaped cross section. The guide rail 4 is arranged so that the base 4a is near the inner wall 1a of the hoistway 1 and the sliding part 4b is near the elevator car 2 or counter weight 3. The guide rail 4 is fixed in the hoistway 1 by using the guide rail fixing device 100 having the configuration below.
As shown in
As shown in
When perpendicularly downward force acts to the guide rail 4 fixed by the guide rail fixing device 100 according to this embodiment, the guide rail 4 is held by frictional force between the guide rail 4 and the friction plate 14 which is placed at a positon higher than the rail bracket 5 and is in contact with the upper end of the vertical part 5b. Therefore, the guide rail 4 can be prevented from falling.
It is preferable that the friction plate 14 is formed of a plate member with a friction coefficient higher than that of the rail bracket. If the material of the friction plate 14 is the same as that of the rail bracket 5, it is preferable that roughness is produced on a face of the friction plate in contact with the base 4a of the guide rail 4 to increase the vertical friction coefficient. This can increase the frictional force between the guide rail 4 and the guide rail fixing device 100.
It should be noted that instead of being provided only to the guide rail fixing device 100 fixing the lowermost guide rail 4, the friction plate 14 may be provided to every guide rail fixing device 100, or may be provided to any number of the guide rail fixing devices 100. By adjusting the number of the friction plates 14 to be provided, the frictional force between the guide rails 4 and the guide rail fixing devices 100 can be adjusted.
As described above, in the guide rail fixing device 100 according to this embodiment, the friction plate 14 is provided at a positon higher than that of the rail bracket 5 fixing the lowermost guide rail 4 so that the friction plate 14 is in contact with the upper end of the vertical part 5b, to increase the frictional force against the guide rail 4. This can prevent the guide rail 4 from falling without increasing the number of the rail brackets 5 installed.
Furthermore, in the fixing device 100 according to this embodiment, the friction coefficient of the face of the friction plate 14 in contact with the bottom face of the base 4a of the guide rail 4 is larger than that of the face of the rail bracket 5 in contact with the same bottom face, which thereby can prevent the guide rail 4 from falling without increasing the number of the rail brackets 5.
Moreover, because the guide rail fixing device 100 according to this embodiment can increase the frictional force against the guide rail 4 without increasing the number of installed rail brackets 5, it becomes unnecessary to increase the number of the beams 7 or the wall-side brackets 9 to be fixed on the inner wall 1a of the hoistway 1, so that the guide rail 4 can be prevented from falling without increasing the installation cost.
Moreover, the guide rail fixing device 100 according to this embodiment uses the same parts as the rail clip 10, the bolt 11, the nut 12, and the spring washer 13 which are used for fixing the guide rail 4 in the hoistway 1, to increase the frictional force against the guide rail 4. This can prevent the manufacturing cost and installation cost from increasing due to the number of the parts' types which might be increased.
Moreover, the guide rail fixing device 100 according to this embodiment includes the rail bracket 5 which is in contact with the bottom face of the base 4a of the guide rail 4 placed in the lowest portion out of multiple guide rails 4 arranged in line in the elevator hoistway 1, and the rail clips 10 which clamp the base 4a of the guide rail 4 in cooperation with the rail brackets 5. Moreover, the guide rail fixing device 100 includes the friction plate 14 which is in contact with the bottom face of the base 4a of the guide rail 4 placed in the lowest portion and in contact with the upper end of the rail bracket 5 to clamp, in cooperation with the rail clips 10, the base 4a of the guide rail 4 placed in the lowest portion. With such a configuration, the guide rail fixing device 100 according to this embodiment can have an increased frictional force against the guide rail 4 without increasing the number of the beams 7 or the wall-side brackets 9 fixed to the inner wall 1a of the hoistway 1.
In addition, in the guide rail fixing device 100 according to this embodiment, the friction coefficient of the face of the friction plate 14 in contact with the bottom face of the base 4a of the guide rail 4 is larger than the friction coefficient of the face of the rail bracket 5 in contact with the bottom face of the base 4a of the guide rail 4. Therefore, the guide rail fixing device 100 can have a further increased frictional force against the guide rail 4.
Furthermore, in the guide rail fixing devices 100 according to this embodiment, the rail clip 10 to clamp, in cooperation with the friction plate 14, the base 4a of the guide rail 4 placed in the lowest portion is the same type as the rail clip 10 to clamp, in cooperation with the rail bracket 5, the base 4a of the guide rail 4. This can prevent the number of part types of the guide rail fixing device 100 from increasing, thereby preventing manufacturing cost and installation cost from increasing.
Furthermore, in the guide rail fixing devices 100 according to this embodiment, the rail brackets 5 are in contact with the respective bottom faces of the bases 4a of the multiple guide rails 4. Moreover, the rail clips 10 clamp the respective bases 4a of the multiple guide rails 4 in cooperation with the rail brackets 5. Moreover, a friction plate 14 is additionally provided to a guide rail 4 other than the guide rail 4 placed in the lowest portion, wherein the friction plate 14 is in contact with the bottom face of the base 4a of the guide rail 4 and is in contact with the upper end of the rail bracket 5 in contact with the bottom face of the base 4a of the guide rail 4, to clamp the base 4a of the guide rail 4 in cooperation with the rail clips 10. In this configuration of the guide rail fixing devices 100, the total amount of frictional force against the guide rails 4 can be adjusted by changing the number of the friction plates 14 to be installed.
It should be noted that the friction plate 14 according to this embodiment can be installed to the existing guide rails 4. Therefore, in a case where the frictional force between the guide rail 4 and the guide rail fixing device 100 is reduced due to lapse of time for example, the frictional force can be increased by providing the required number of the friction plates 14, whereby it becomes unnecessary to replace parts of the guide rail fixing device 100.
Filing Document | Filing Date | Country | Kind |
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PCT/JP2015/075781 | 9/11/2015 | WO | 00 |
Publishing Document | Publishing Date | Country | Kind |
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WO2017/042945 | 3/16/2017 | WO | A |
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Number | Date | Country | |
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20180251341 A1 | Sep 2018 | US |