elevator

Abstract

This elevator comprises a car having a car room, a guide rail for guiding the movement of the car, a lower frame disposed below the car room, and an emergency stop device that stops the movement of the car. The emergency stop device comprises a braking mechanism that has brake elements that sandwich the guide rail, a drive mechanism for actuating the braking mechanism, and an actuation mechanism for actuating the drive mechanism. The drive mechanism and the actuation mechanism are contained in the lower frame.

Description

Technical Field

[0001] The present invention relates to an elevator equipped with an emergency stop device for stopping the car in an emergency.

Background Art

[0002] Generally, a rope-type elevator has long objects such as a main rope and a compensating rope that connect the car and the counterweight, and a speed regulating rope used to detect the speed of the car or the counterweight. In addition, as a safety device, an elevator is required to be provided with an emergency stop device that automatically stops the operation of the car when the speed of the car moving up and down along the guide rail exceeds a specified value.

[0003] As a conventional emergency stop device of this type, for example, there is a technique described in Patent Document 1. This Patent Document 1 describes a technique in which a braking mechanism that sandwiches a guide rail in the emergency stop device and an operating device that operates the braking mechanism are housed in a vertical frame that constitutes a car.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the technique described in Patent Document 1, since the braking mechanism of the emergency stop device and the operating device are installed in the vertical frame of the car, the vertical frame has become large. As a result, the technique described in Patent Document 1 has a problem that the dimensions of the car compartment of the car become smaller due to the enlargement of the vertical frame.

[0006] The objective of this invention is to provide an elevator that can suppress the enlargement of the vertical frame, taking into consideration the problems mentioned above. [Means for solving the problem]

[0007] To solve the above problems and achieve the objective, the elevator comprises a car having a cabin, guide rails for guiding the movement of the car, a lower frame positioned below the cabin, and an emergency stop device for stopping the movement of the car. The emergency stop device comprises a braking mechanism having a braker that grips the guide rails, a drive mechanism for operating the braking mechanism, and an operating mechanism for operating the drive mechanism. The drive mechanism and the operating mechanism are housed in the lower frame. [Effects of the Invention]

[0008] According to the elevator configuration described above, it is possible to suppress the enlargement of the vertical frame. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic diagram showing the elevator car according to the first embodiment. [Figure 2] This is a cross-sectional view along line AA shown in Figure 1. [Figure 3] This figure shows the operating mechanism and drive mechanism of an emergency stop device according to an example embodiment. [Figure 4] This is a cross-sectional view showing the lower frame and operating mechanism of an elevator according to a second embodiment. [Figure 5] This is a cross-sectional view showing the lower frame and operating mechanism of an elevator according to a third embodiment. [Figure 6] This is a front view showing the lower frame of an elevator according to a fourth embodiment. [Modes for carrying out the invention]

[0010] The elevator according to the embodiment will be described below with reference to Figures 1 to 6. Note that common components in each figure are denoted by the same reference numerals.

[0011] 1. Example of the first embodiment 1-1. Example of a vehicle configuration First, the configuration of the elevator car according to the first embodiment (hereinafter referred to as "this example") will be described with reference to Figures 1 and 2. Figure 1 is a schematic diagram showing an example of the elevator car configuration in this example. Figure 2 is a cross-sectional view taken along line AA shown in Figure 1.

[0012] As shown in Figure 1, the elevator car 1 of this example moves up and down within a hoistway formed in a building structure. The elevator car 1 is slidably supported by guide rails 201A and 201B erected within the hoistway. The elevator car 1 comprises a car compartment 120 for carrying people and luggage, an upper frame (crosshead) 121, lower frames 131 and 134, vertical frames 140, and an emergency stop device.

[0013] The upper frame 121 is positioned at the top of the elevator car 120 in the vertical direction. The lower frames 131 and 134 are positioned at the bottom of the elevator car 120 in the vertical direction. A vibration-damping member 160 is interposed between the first lower frame 131 and the elevator car 120. The vertical frame 140 connects the upper frame 121 and the lower frames 131 and 134 and is positioned along the vertical direction of the elevator car 120.

[0014] The emergency stop device includes two braking mechanisms 10A and 10B, an operating mechanism 11, a drive mechanism 12, a first lifting member 13A, and a second lifting member 13B. As shown in Figures 1 and 2, the operating mechanism 11 and the drive mechanism 12 are located on the lower frames 131 and 134. The detailed configuration of the lower frames 131 and 134 and the installation state of the operating mechanism 11 and the drive mechanism 12 will be described later. The braking mechanisms 10A and 10B are located at the lower ends in the vertical direction of the vertical frame 140.

[0015] The braking mechanisms 10A and 10B have a pair of brake pads not shown. The pair of brake pads are arranged opposite to each other with the guide rails 201A and 201B interposed therebetween. The pair of brake pads are connected to the lifting members 13A and 13B. When the pair of brake pads are lifted upward in the vertical direction by the lifting members 13A and 13B, they sandwich the guide rails 201A and 201B. Thereby, the vertical movement of the car 1 is braked by the braking mechanisms 10A and 10B.

[0016] Next, the configurations of the operating mechanism 11 and the drive mechanism 12 will be described with reference to FIGS. 1 and 3. FIG. 3 is a diagram showing the operating mechanism 11 and the drive mechanism 12.

[0017] As shown in FIGS. 1 and 3, the drive mechanism 12 includes a drive shaft 15, a first lifting lever 16A, a second lifting lever 16B, drive shafts 18, 18, and a drive spring 20. The drive shafts 18 are installed at both ends in the width direction orthogonal to the vertical direction in the upper frame 121. The lifting levers 16A and 16B are rotatably supported on the drive shafts 18.

[0018] The first lifting lever 16A and the second lifting lever 16B are formed in a substantially T shape. The drive shaft 18 is provided at the intersection of the T shapes of the first lifting lever 16A and the second lifting lever 16B.

[0019] The first lifting member 13A is connected to the first lifting lever 16A via a connection portion 26A, and the second lifting member 13B is connected to the second lifting lever 16B via a connection portion 26B. Also, as shown in FIG. 3, the first lifting lever 16A is connected to the drive shaft 15 via a connection portion 25. Similarly, the second lifting lever 16B is connected to the drive shaft 15 via a connection portion not shown. Further, the end of the first lifting lever 16A on the side opposite to the connection portion 25 is connected to a connection member 41 of the operating mechanism 11 described later via a lever bracket 37.

[0020] The drive shaft 15 is positioned within the second lower frame 134, along its width. One axial end of the drive shaft 15 is connected to the first lifting lever 16A, and the other axial end of the drive shaft 15 is connected to the second lifting lever 16B. A drive spring 20 is provided in the axial middle section of the drive shaft 15.

[0021] The drive spring 20 is composed of, for example, a compression coil spring. One end of the drive spring 20 is fixed to the second lower frame 134 via a fixing part, and the other end of the drive spring 20 is fixed to the drive shaft 15 via a pressing member. The drive spring 20 then biases the drive shaft 15 toward the other end in the axial direction via the pressing member.

[0022] When the operating mechanism 11 is activated, the drive shaft 15 is biased by the drive spring 20 and moves toward the other end in the axial direction. As a result, the first lifting lever 16A rotates around the drive shaft 18 so that the end to which the first lifting member 13A is connected faces upward in the vertical direction. Similarly, the second lifting lever 16B rotates around the drive shaft 18 so that the end to which the second lifting member 13B is connected faces upward in the vertical direction. As a result, the first lifting member 13A and the second lifting member 13B are pulled upward in the vertical direction in conjunction, and the braking mechanisms 10A and 10B are activated.

[0023] As shown in Figure 3, the operating mechanism 11 comprises a connecting member 41, an electromagnetic core 43, a movable iron core 44, a base plate 45, a drive motor 46, a feed screw shaft 47, a feed nut 48, and a drive motor. The operating mechanism 11 then operates the drive mechanism 12.

[0024] The base plate 45 is formed from a flat plate-shaped member. The base plate 45 is fixed to the mounting bracket 133 of the second lower frame 134 (see Figures 1 and 2), which will be described later. The first shaft support portion 54 and the second shaft support portion 55 are fixed to the upper surface portion of the base plate 45 in the vertical direction.

[0025] The first shaft support portion 54 is located at one end of the base plate 45, and the second shaft support portion 55 is located at the other end of the base plate 45. The first shaft support portion 54 and the second shaft support portion 55 are positioned opposite each other. The lead screw shaft 47 is rotatably supported by the first shaft support portion 54 and the second shaft support portion 55. A drive motor 46 is located in the second shaft support portion 55. The drive motor 46 may also be provided on the side of the first shaft support portion 54. The rotating shaft of the drive motor 46 is attached to the lead screw shaft 47 via a coupling.

[0026] A trapezoidal thread is formed on the outer surface of the lead screw shaft 47. A lead nut 48 is screwed onto the lead screw shaft 47. An electromagnetic core 43 is fixed to the lead nut 48. A coil is provided on the electromagnetic core 43. Power is supplied to the coil from a power source (not shown), and when the coil is energized, the electromagnetic core 43 and the coil form an electromagnet. The electromagnetic core 43 then faces a movable iron core 44 attached to a connecting member 41, which will be described later.

[0027] When the drive motor rotates, the lead screw shaft rotates. As the lead screw shaft 47 rotates, the rotational force of the lead screw shaft 47 is converted into an axial force by the threaded portion and threaded hole. The lead nut 48 then moves along the axial direction of the lead screw shaft 47. The electromagnetic core 43 to which the lead nut 48 is fixed also moves along the axial direction of the lead screw shaft 47.

[0028] When the drive motor rotates in the forward direction, the feed nut 48 moves toward the first shaft support 54. When the drive motor rotates in the reverse direction, the feed nut 48 moves toward the second shaft support 55. Here, the second shaft support 55 is positioned in the standby position for the feed nut 48 and the electromagnetic core 43. When the operating mechanism 11 returns from the standby state and the braking state to the recovery state, the electromagnetic core 43 comes into contact with the second shaft support 55 via the feed nut 48.

[0029] A connecting hole 41a is formed in the connecting member 41. A connecting pin 36 provided on the lever bracket 37 is inserted through the connecting hole 41a. As a result, the connecting member 41 is rotatably connected to the first lifting lever 16A via the lever bracket 37.

[0030] Furthermore, a movable core 44 is fixed to the connecting member 41. The movable core 44 is supported by the connecting member 41 and faces the electromagnetic core 43 which is fixed to the feed nut 48. In the standby state shown in Figure 3, the movable core 44 is attracted to the electromagnetic core 43.

[0031] Furthermore, a moving mechanism is configured using a drive motor 46, a feed screw shaft 47, and a feed nut 48 to move the electromagnetic core 43 toward and toward the movable iron core 44.

[0032] In standby mode, the electromagnetic core 43 is positioned on the other axial end of the lead screw shaft 47. The coil of the electromagnetic core 43 is energized, thus exciting the electromagnetic core 43. This constitutes an electromagnet formed by the electromagnetic core 43 and the coil.

[0033] The movable iron core 44 is attracted to the electromagnetic core 43. As a result, the movable iron core 44 holds one end of the first lifting lever 16A via the fixed connecting member 41. Consequently, the drive shaft 15 connected to the other end of the first lifting lever 16A is biased axially toward one end against the biasing force of the drive spring 20.

[0034] When elevator car 1 is descending, if the control unit determines that the descending speed of elevator car 1 exceeds a predetermined speed, the control unit outputs an operation command signal to the emergency stop device. This cuts off the power supply to the electromagnetic core 43. Note that the power supply to the electromagnetic core 43 is cut off not only when elevator car 1 exceeds its speed limit, but also when the elevator experiences a power outage.

[0035] When the power supply to the electromagnetic core 43 is cut off, the magnetism of the electromagnetic core 43 is eliminated. As a result, the drive shaft 15 moves axially toward the other end due to the biasing force of the drive spring 20, and one end of the first lifting lever 16A also moves axially toward the other end along with the drive shaft 15. Consequently, the first lifting lever 16A and the second lifting lever 16B rotate around the drive shaft 18. In this way, the drive mechanism 12 is operated by the operating mechanism 11.

[0036] Furthermore, the rotation of the first lifting lever 16A separates the movable iron core 44 from the electromagnetic core 43. In this way, by separating the movable iron core 44 from the electromagnetic core 43, the connecting member 41 can be moved without being affected by the frictional force and holding force of the feed screw shaft 47 and feed nut 48, which are the moving mechanism.

[0037] Furthermore, the configuration of the operating mechanism 11 and the drive mechanism 12 is not limited to the example described above, and various other configurations can be applied.

[0038] 1-2. Configuration of the lower frame and arrangement of the operating mechanism Next, the configuration of the lower frames 131 and 134 and the arrangement of the operating mechanism 11 will be described with reference to Figures 1 and 2.

[0039] As shown in Figures 1 and 2, the lower frame comprises a first lower frame 131, a second lower frame 134, and a mounting bracket 133. The first lower frame 131 is positioned along the front-to-back direction, which is perpendicular to both the vertical and width directions. The second lower frame 134 is positioned at the lower end of the first lower frame 131 in the vertical direction. The second lower frame 134 is positioned along the width direction, which is perpendicular to the first lower frame 131.

[0040] The first lower frame 131 and the second lower frame 134 are formed in a roughly U-shape. The second lower frame 134 is positioned with its side surfaces facing each other and spaced apart in the front-rear direction. The drive shaft 18 of the drive mechanism 12 is attached to the side surface of the second lower frame 134. The drive shaft 18 is positioned between the two second lower frames 134, 134. An upper flange portion 134a is formed at the upper end in the vertical direction of the side surface of the second lower frame 134, 134, and a lower flange portion 134b is formed at the lower end in the vertical direction of the side surface. The first lower frame 131 is placed on the upper flange portion 134a.

[0041] A mounting bracket 133 is fixed to the lower flange portion 134b via fixing bolts 90. The mounting bracket 133 is positioned to connect the two second lower frames 134, 134.

[0042] The above-described operating mechanism 11 is mounted on the upper surface of the mounting bracket 133 in the vertical direction. That is, the operating mechanism 11 and the drive mechanism 12 are housed in the space enclosed by the lower frames 131, 134 and the mounting bracket 133. Therefore, the upper part of the operating mechanism 11 and the drive mechanism 12 in the vertical direction is covered by the first lower frame 131 and the car chamber 120. This prevents dust and rail oil from adhering to the operating mechanism 11 and the drive mechanism 12. As a result, the operation of the operating mechanism 11 and the drive mechanism 12 can be prevented from being hindered by dust and rail oil, and the reliability of the emergency stop device can be improved.

[0043] Furthermore, by housing the operating mechanism 11 and drive mechanism 12 of the emergency stop device within the lower frames 131 and 134, it is possible to suppress the enlargement of the vertical frame 140 of the elevator car 1. As a result, since the enlargement of the vertical frame 140 can be suppressed, the reduction in the horizontal dimensions of the elevator car 120 due to the vertical frame 140 can be suppressed.

[0044] Furthermore, by arranging the operating mechanism 11 and the drive mechanism 12 on the lower frames 131 and 134, the length of the lifting members 13A and 13B can be shortened compared to arranging them on the upper part of the elevator car 120. As a result, the weight of the lifting members 13A and 13B can be reduced, and the braking force applied to the braking mechanisms 10A and 10B can also be reduced.

[0045] 2. Second Embodiment Example Next, an elevator according to a second embodiment will be described with reference to Figure 4. Figure 4 is a cross-sectional view showing the lower frame and operating mechanism according to a second embodiment.

[0046] The elevator according to this second embodiment differs from the elevator according to the first embodiment in that a cover bracket is provided on the upper part of the second lower frame 134. Therefore, parts common to the elevator according to the first embodiment are denoted by the same reference numerals, and redundant explanations are omitted.

[0047] As shown in Figure 4, a cover bracket 136 is fixed to the upper flange portion 134a of the second lower frame 134. The cover bracket 136 is positioned to connect the two second lower frames 134, 134 and covers the vertically upper portion of the operating mechanism 11 and drive mechanism 12 located between the two second lower frames 134, 134. The cover bracket 136 may cover only a portion of the vertically upper portion between the second lower frames 134, 134, or it may cover the entire portion.

[0048] Since the other configurations are the same as those of the elevator according to the first embodiment, their description will be omitted. The elevator according to the second embodiment, having such a configuration, can also obtain the same effects and advantages as the elevator according to the first embodiment described above.

[0049] 3. Third Embodiment Example Next, an elevator according to a third embodiment will be described with reference to Figure 5. Figure 5 is a cross-sectional view showing the lower frame and operating mechanism according to a third embodiment.

[0050] The elevator according to this third embodiment differs from the elevator according to the first embodiment in its mounting bracket configuration. Therefore, the mounting bracket will be described here, and parts common to the elevator according to the first embodiment will be denoted by the same reference numerals, and redundant explanations will be omitted.

[0051] As shown in Figure 5, the hole in the side surface of the second lower frame 134 in this third embodiment, through which the drive shaft 18 is attached, is an elongated hole extending in the vertical direction. The mounting bracket 333 is fitted between the side surfaces of the two second lower frames 134, 134, thereby closing a portion of the opening between the two second lower frames 134, 134. Fixing pieces 333a are provided at both ends of the mounting bracket 333 in the front-rear direction. The fixing pieces 333a are bent upward in the vertical direction from the mounting surface on which the operating mechanism 11 is placed. The fixing pieces 333a face the side surface of the second lower frame 134 and are fixed to the side surface via fixing bolts 90. The fixing holes in the fixing pieces 333a or the second lower frame 134 through which the fixing bolts 90 are inserted are elongated holes extending in the vertical direction. That is, the mounting bracket 333 is positioned to be movable in the vertical direction relative to the second lower frame 134.

[0052] By using the above-described method for fixing the mounting bracket 333, the height of the mounting position of the mounting bracket 333 can be adjusted. As a result, the vertical installation position of the drive shaft 18 of the operating mechanism 11 and drive mechanism 12 mounted on the mounting bracket 333 can be adjusted.

[0053] Since the other configurations are the same as those of the elevator according to the first embodiment, their description will be omitted. The elevator according to the third embodiment, having such a configuration, can also obtain the same effects and advantages as the elevator according to the first embodiment described above.

[0054] 4. A fourth embodiment example Next, an elevator according to the fourth embodiment will be described with reference to Figure 6. Figure 6 is a front view showing the lower frame according to the fourth embodiment.

[0055] The elevator according to this fourth embodiment differs from the elevator according to the first embodiment in the configuration of the second lower frame. Therefore, the second lower frame will be described here, and parts common to the elevator according to the first embodiment will be denoted by the same reference numerals, and redundant explanations will be omitted.

[0056] As shown in Figure 6, an opening window 138 is formed on the side of the second lower frame 134B. The opening window 138 is positioned to face the operating mechanism 11 housed in the second lower frame 134B. This opening window 138 is covered by a cover member (not shown) that can be opened and closed. By providing the opening window 138 on the second lower frame 134B, the assembly status of the operating mechanism 11 can be easily checked visually, and inspection and testing work can be easily performed.

[0057] Since the other configurations are the same as those of the elevator according to the first embodiment, their description will be omitted. The elevator according to the fourth embodiment, which has such a second lower frame 134B, can also obtain the same effects and advantages as the elevator according to the first embodiment described above.

[0058] It should be noted that the invention is not limited to the embodiments described above and shown in the drawings, and various modifications can be made without departing from the gist of the invention as described in the claims.

[0059] In the above-described embodiment, both ends in the width direction of the lower frame are open, but the invention is not limited to this, and covers may be provided to close both ends of the lower frame. Furthermore, since dust and rail oil fall from above in the vertical direction, it is possible to prevent dust and rail oil from adhering to the operating mechanism 11 and the drive mechanism 12 even without providing covers to close both ends of the lower frame.

[0060] Furthermore, a housing may be provided to enclose the operating mechanism 11 mounted on the mounting bracket. This can more effectively prevent dust and rail oil from adhering to the operating mechanism 11.

[0061] Furthermore, this technology can be applied to multi-car elevators, where multiple elevator cars move up and down within a single hoistway. Also, the lower frame configuration is not limited to a U-shape; a hat-shaped steel frame may also be used.

[0062] In this specification, although terms such as "parallel" and "orthogonal" are used, these do not mean only strictly "parallel" and "orthogonal," but may also refer to states that are "approximately parallel" or "approximately orthogonal," which include "parallel" and "orthogonal" and are within a range in which they can perform their functions. [Explanation of symbols]

[0063] 1…Elevator car, 10A, 10B…Braking mechanism, 11…Operating mechanism, 12…Drive mechanism, 13A, 13B…Lifting member, 16A, 16B…Lifting lever, 18…Drive shaft, 41…Connecting member, 43…Electromagnetic core, 44…Movable iron core, 46…Drive motor, 90…Fixing bolt, 120…Elevator car compartment, 121…Upper frame, 131, 134, 134B…Lower frame, 133, 333…Mounting bracket, 136…Cover bracket, 138…Opening window, 140…Vertical frame, 201A, 201B…Guide rail

Claims

1. A train car having a cage, A guide rail for guiding the movement of the aforementioned elevator car, A lower frame positioned at the bottom of the aforementioned elevator car, It is equipped with an emergency stop device that stops the movement of the elevator car, The aforementioned emergency stop device is A braking mechanism having a braker that grips the guide rail, A drive mechanism for operating the aforementioned braking mechanism, The drive mechanism is operated by an operating mechanism, The aforementioned lower frame comprises a first lower frame and a second lower frame. The first lower frame extends along the front-to-back direction, which is perpendicular to the vertical direction and also perpendicular to the width direction, and the two first lower frames are spaced apart in the width direction. The second lower frame is positioned along the width direction at the lower end of the first lower frame in the vertical direction, The drive mechanism and the operating mechanism are housed in the second lower frame. A mounting bracket on which the operating mechanism is mounted is fixed to the second lower frame, and the mounting bracket is arranged to be movable vertically relative to the second lower frame. Elevator.

2. The second lower frame is provided in two units spaced apart in the front-to-back direction. The drive mechanism and the operating mechanism are housed between the two second lower frames. The elevator according to claim 1.

3. The first lower frame is formed in a roughly U-shape, A vibration-damping member is interposed between the first lower frame and the elevator car chamber. The elevator according to claim 1.

4. A cover bracket is fixed to the second lower frame, covering the vertically upper portion of the drive mechanism and the operating mechanism. The elevator according to claim 1.

5. The second lower frame has an opening window that overlooks the operating mechanism. The elevator according to claim 1.

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