Replacing method of elevator hoist braking device and braking device

Abstract

To provide a replacing method of an elevator hoist braking device and a braking device capable of realizing miniaturization without deteriorating performance and capable of safely being detached / attached from / to a hoist with the aid of a lifting device.SOLUTION: A replacing method of a braking device places a fixing part placed through any bolt among multiple bolts and a bracket with a locking part extending from the fixing part on the braking device, locks them at the locking part of the bracket with a hook of a lifting device or with a rope, and removes the braking device from the hoist or installs the same to the hoist while any bolt to fix at least the bracket is held in the braking device.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a method for replacing a brake device of an elevator hoisting machine and to a brake device. [Background technology]

[0002] In so-called machine-room-less elevators, which do not have a machine room in which to place the hoist, the hoist is placed on a hoist support member installed, for example, at the top of the hoistway. A main rope with a car supported on one end and a counterweight supported on the other end is wound around a sheave attached to the rotating shaft of the hoist. The car and the counterweight are driven in different vertical directions by the drive of the hoist. The counterweight is attached to reduce the load on the hoist.

[0003] The hoist that drives the elevator car up and down is equipped with a large brake device. The brake device of the hoist is periodically replaced for safety reasons. The area around the hoist is very narrow, so the brake device replacement work is subject to spatial constraints. To replace the brake device, for example, the car is placed at the top and the worker works by standing on the top of the car.

[0004] In order to prevent the brake device from falling, when replacing a large brake device in such an extremely narrow space, it is usually necessary to use a lifting device to lift the brake device and then remove and attach it to the hoist. In this case, a hole is provided in the brake device for inserting an eyebolt, and when replacing the brake device, the eyebolt is set in the brake device so that the brake device can be lifted up by a hook or rope of the lifting device via the eyebolt. Patent Documents 1 and 2 disclose techniques related to such brake device replacement work. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-210109 A [Patent Document 2] Patent Publication No. 2022-015245 Summary of the Invention [Problem to be solved by the invention]

[0006] For the reasons mentioned above, in recent years, there has been a demand for the miniaturization of brake devices, which must be replaced in extremely narrow spaces. If the brake device could be made smaller, replacement work could be carried out with more room in the restricted space, and safety could be ensured.

[0007] However, on the other hand, brake devices incorporate an electromagnetic core that creates a magnetic field and an armature that is actuated by the electromagnetic core, and the magnetic force from this electromagnetic core and the mechanical force from the armature must be kept at constant values, which places restrictions on miniaturization.

[0008] The present invention provides a method for replacing a brake device of an elevator hoist machine, which can be made smaller without degrading performance, and which can be safely detached from and attached to the hoist machine with the assistance of a lifting device. [Means for solving the problem]

[0009] The method for replacing a brake device for an elevator hoist of the present invention applies a brake device that is attached to the elevator hoist and includes a core part containing an electromagnetic core and an armature part that operates depending on the presence or absence of magnetic force of the core part to brake the hoist. The brake device is attached to the hoist by a plurality of bolts that penetrate from the core part to the armature part, and such a brake device is replaced with the assistance of a lifting device.

[0010] The replacement method involves placing a bracket on the brake device, the bracket having a fixing portion that is positioned to pass through any one of the multiple bolts and a locking portion extending from the fixing portion, and locking the locking portion of the bracket with a hook or rope of the lifting device, and removing the brake device from the hoisting machine or attaching it to the hoisting machine while retaining at least the any one of the bolts that secures the bracket in place in the brake device.

[0011] The brake device of the present invention is applied to a brake device that is attached to an elevator hoist and includes a core part containing an electromagnetic core and an armature part that operates depending on the presence or absence of magnetic force of the core part to brake the hoist. The brake device is attached to the hoist by a bolt that penetrates from the core part to the armature part, and includes a bracket that has a fixing part that is disposed to penetrate the bolt and a locking part that locks a hook or rope of a lifting device. Effect of the Invention

[0012] The brake device replacement method and brake device configured in this manner can avoid the formation of holes in the brake device for installing eyebolts, etc., and can be replaced with the aid of a lifting device simply by attaching the bracket to the brake device. The formation of holes in the brake device for installing eyebolts, etc., has hindered the improvement of magnetic flux density by the electromagnetic core, but being able to avoid the formation of these holes can improve the magnetic flux density of the magnetic force by the electromagnetic core, and accordingly, the brake device can be made more compact.

[0013] Therefore, according to the method for replacing the brake device of an elevator hoisting machine of the present invention, it is possible to reduce the size and safely detach the brake device from the hoisting machine with the assistance of the lifting device, thereby preventing the brake device from falling. [Brief description of the drawings]

[0014] [Figure 1] 1 is a schematic diagram of an elevator to which the present invention is applied. [Diagram 2]FIG. 2 is a diagram showing the appearance of the brake device when attached to a hoisting machine. [Diagram 3] FIG. 1 is a diagram showing the first embodiment of the present invention, illustrating a configuration when a bracket is attached to a brake device. [Figure 4] FIG. 4 is a perspective view of the configuration shown in FIG. [Diagram 5] FIG. 4 is a perspective view showing a part of the configuration shown in FIG. 3 in an exploded form. [Figure 6] FIG. 1 is a diagram showing a first embodiment of the present invention, and is a step diagram showing a method for replacing a brake device. [Figure 7] FIG. 11 is a diagram showing a second embodiment of the present invention, illustrating a configuration when a bracket is attached to a brake device. [Figure 8] FIG. 8 is a perspective view of the configuration shown in FIG. [Figure 9] FIG. 11 is a diagram showing a second embodiment of the present invention, and is a step diagram showing a method for replacing a brake device. [Figure 10] FIG. 11 is a diagram showing a third embodiment of the present invention, illustrating a configuration when a bracket is attached to a brake device. [Figure 11] FIG. 11 is a perspective view of the configuration shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description of an embodiment of the present invention will be given with reference to the accompanying drawings. Note that the same elements are designated by the same reference numerals throughout the description of the embodiment. (Embodiment 1)

[0016] [Elevator outline] FIG. 1 is a schematic diagram showing an elevator 1. As shown in FIG. 1, the elevator 1 does not have a machine room in which a hoisting machine 6 is arranged, and has a so-called machine room-less configuration in which the hoisting machine 6 is arranged in a hoistway 2. The elevator 1 includes a car (not shown) that moves up and down in the hoistway 2, a counterweight 4, and a main rope 5. One end of the main rope 5 is connected to the car, and the other end of the main rope 5 is wound around a counterweight hoist 4A provided on the counterweight 4 and connected to a hoisting machine support member 7. The main rope 5 is wound around a sheave 6A of the hoisting machine 6. When the hoisting machine 6 is driven, the main rope 5 moves, and the car and the counterweight 4 move up and down in different vertical directions in the hoistway 2.

[0017] The hoisting machine 6 is installed on a hoisting machine support member 7 provided at the top of the hoistway 2. A sheave 6A is attached to the hoisting machine 6 via a rotating shaft. Two brake devices 10, for example, are attached to the hoisting machine 6 on its outer periphery. The number of brake devices 10 is not limited to two, and may be one. The brake devices 10 are configured to brake the rotation of the sheave 6A of the hoisting machine 6 when necessary.

[0018] 1 also shows a car-side guide 3A that guides the running of the car, a counterweight-side guide 3B that guides the running of the counterweight 4, and a speed governor 8 that detects the speed of the car. The speed governor 8 has a governor lobe 8A wound therearound that moves in accordance with the running of the car.

[0019] In the elevator 1 configured in this manner, a lifting device (not shown) is installed near the hoist 6. The lifting device is a device for supporting the replacement work of the brake device 10 attached to the hoist 6. Therefore, the lifting device is not permanently installed near the hoist 6, but is installed when the brake device 10 is replaced, and is removed after the replacement work is completed. The lifting device is equipped with a hook suspended from its frame, and the hook is capable of moving horizontally and vertically. The lifting device is not limited to one equipped with a hook, and may be only a rope.

[0020] [Brake system configuration] Fig. 2 is a diagram showing the appearance of the brake device 10 when attached to the hoist 6. Fig. 2(a) is a top view, Fig. 2(b) is a side view, and Fig. 2(c) is another side view perpendicular to the side view. The brake device 10 is composed of a core portion 10a and an armature portion 10b. The core portion 10a and the armature portion 10b each have an outer frame made of a rectangular body. The core portion 10a and the armature portion 10b are laminated and integrally configured.

[0021] A groove portion 10c consisting of a narrow gap is formed between the core portion 10a and the armature portion 10b on one side of the brake device 10 and on the opposite side opposite to the one side. The brake device 10 is attached to the hoisting machine 6 by a bolt 10d penetrating from the core portion 10a to the armature portion 10b. The bolt 10d has a head on the side of the core portion 10a, and four bolts 10d are arranged near each of the four corners of the core portion 10a. The number of bolts 10d is not necessarily limited to four, and may be three, or may be five or more. The tip of each bolt 10d (the end opposite to the head) is screwed into the hoisting machine 6, so that the brake device 10 is attached to the hoisting machine 6. Each bolt 10d penetrating the core portion 10a and the armature portion 10b passes through the area in which the groove portion 10c is formed.

[0022] 2(c), holes 10e are formed at the upper corners of one side surface of the brake device 10 on which the groove portion 10c is formed and the surface opposite to this side surface. These holes 10e are formed for mounting a dust cover on the brake device 10.

[0023] The internal mechanism of the brake device 10 is a known technique, so an example will be given and briefly described. The core section 10a incorporates an electromagnetic core provided with an electromagnetic coil. The armature section 10b incorporates an armature arranged to face the magnetically attractive surface of the electromagnetic core, a biasing member that biases the armature in a direction away from the electromagnetic core, and a pair of brake levers that are attached to the surfaces opposite the magnetically attractive surfaces of the electromagnetic core and armature and apply pressure to each of the braking surfaces on both sides of the sheave 6A that operates against the biasing member when current is passed through the electromagnetic core. A rotating shaft is formed at approximately the center of each brake lever, and a brake shoe is attached to the tip of each brake lever.

[0024] In the operation of the brake device 10, when the hoist 6 is in operation, the electromagnetic coil of the electromagnetic core is energized, and the armature is attracted to the magnetic attraction surface of the electromagnetic core against the biasing force of the biasing member. The pair of brake levers rotate around a pivot shaft formed at approximately the middle part. The pair of brake shoes move away from the respective braking surfaces of the sheave 6A. When the hoist 6 is stopped, the energization of the electromagnetic coil is stopped, and the magnetism of the electromagnetic core is eliminated. The electromagnetic core and the armature are biased by the biasing member and move in a direction away from each other. The pair of brake levers rotate around the pivot shaft, and the respective brake shoes press the respective braking surfaces of the sheave 6A, and the sheave 6A is braked. The brake device 10 applicable to the present invention is not limited to the above-mentioned mechanism and operation, and any brake device 10 having a built-in magnetic core can be applied to the implementation of the present invention.

[0025] [Configuration of brake device with bracket attached] The method of replacing the brake device 10 of the hoist 6 of the elevator 1 of the present invention requires the attachment of a bracket 20 to the brake device 10 and the subsequent removal of the bracket 20 during the replacement process. Fig. 3 is a diagram showing the configuration when the bracket 20 is attached to the brake device 10. Fig. 3 corresponds to Fig. 2. Fig. 4 is a perspective view of the brake device 10 shown in Fig. 3.

[0026] The bracket 20 is attached to one bolt 10D of four bolts 10d that attach the brake device 10 to the hoist 6. The bracket 20 is made of a U-shaped flat plate member made of, for example, metal. As shown in Fig. 5, which corresponds to Fig. 4 and shows the bolt 10D and bracket 20 removed, the bracket 20 is formed with both ends bent at right angles in the same direction, and both bent ends form a fixing portion 20a for the brake device 10, and the portion between the two ends forms a locking portion 20b for a hook or rope of a lifting device.

[0027] As shown in FIG. 4, one fixing portion 20a of the bracket 20 is fixed between the head of the bolt 10D and the core portion 10a of the brake device 10, and the other fixing portion 20a of the bracket 20 is fixed between the armature portion 10b of the brake device 10 and the hoist 6. As shown in FIG. 5, holes 20c are formed in the fixing portions 20a at both ends of the bracket 20. That is, the bracket 20 is fixed to the brake device 10 by the bolt 10D penetrating the holes 20c of the fixing portions 20a of the bracket 20. As shown in FIG. 3(b), the locking portion 20b of the bracket 20 forms a gap 20d between the brake device 10, and a hook or rope of a lifting device can be locked to the locking portion 20b through the gap 20d.

[0028] Although the above-mentioned bracket 20 has been given as an example of a U-shaped bracket, the bracket is not limited to this shape and may be L-shaped or of other shapes as long as it can be attached by passing the bolt 10D therethrough.

[0029] [How to replace the brake system] Figure 6 shows steps for replacing a brake device attached to a hoisting machine with a replacement brake device. Figure 6(a) shows a step for detaching the brake device 10 attached to the hoisting machine 6 from the hoisting machine 6 with the assistance of a lifting device.

[0030] First, in step ST1, the replacement worker attaches the bracket 20 to the bolt 10D of the brake device 10 attached to the hoisting machine 6. That is, the car is moved to the top of the elevator shaft 2 and brought close to the hoisting machine 6. The replacement worker for the brake device 10 stands on the upper surface of the car and faces the hoisting machine 6. At this time, the replacement worker has placed a new brake device 10 for replacement on the upper surface of the car in advance. The replacement worker removes one bolt 10D of the four bolts 10d for attaching the brake device 10 to the hoisting machine 6 from the brake device 10, and inserts the same or a different bolt 10D into the same bolt hole of the brake device 10 again. At this time, the bracket 20 shown in Figs. 3 to 5 is inserted through the bolt 10D of the brake device 10.

[0031] 3 to 5, the bracket 20 is U-shaped, with the bent portions at both ends serving as fixing portions 20a for the bolts 10D, and the portion between the fixing portions 20a serving as locking portions 20b for locking the hooks or ropes of the lifting device. The fixing portions 20a are provided with holes 20c through which the bolts 10D pass. As a result, the bracket 20 is attached to the brake device 10 mounted on the hoisting machine 6, and a gap 20d is formed between the bracket 20 and the brake device 10.

[0032] Next, in step ST2, preparations are made for lifting the brake device 10 by a lifting device that has been installed in advance near the hoist 6. That is, a hook or rope connected to the frame of the lifting device is passed through the gap 20d between the bracket 20 and the brake device 10 and engaged with the engaging portion 20b, thereby preparing to lift the brake device 10 by the lifting device.

[0033] Next, in step ST3, the bolts 10d other than the bolt 10D for mounting the bracket 20 are removed. That is, of the four bolts 10d for mounting the brake device 10 to the hoisting machine 6, the other three bolts 10d other than the bolt 10D for mounting the bracket 20 are removed first. In this case, each bolt 10d may be left in the brake device 10 to the extent that it is released from being screwed into the hoisting machine 6. This is because each bolt 10d may be removed at any time thereafter.

[0034] Next, in step ST4, the bolt 10D for mounting the bracket 20 is released from the hoist 6. That is, removal of the bolt 10D for mounting the bracket 20 is stopped at the extent of releasing the screwing from the hoist 6. At this time, the bracket 20 remains attached to the bolt 10D remaining in the brake device 10, and the bracket 20 is hooked to the hook or rope connected to the lifting device, which prevents the brake device 10 from falling.

[0035] The inconvenience that the bolt 10D that mounts the bracket 20 becomes easily movable in the axial direction due to the release of the bolt 10D from the hoist 6 can be avoided by screwing a nut onto the tip end (the end opposite the head of the bolt) of the bolt 10D. As another method, such an inconvenience can also be avoided by threading the inner surface of the hole 20c of the fixing part 20a opposite the head side of the bolt 10D of the bracket 20 so that the bolt 10D can be screwed onto the hole 20c, thereby giving the bracket 20 the same function as the nut.

[0036] Next, in step ST5, the brake device 10 is lifted and moved by the lifting device. That is, with the assistance of the lifting device, the brake device 10 detached from the hoist 6 is lifted by the hook or rope of the lifting device and placed near the replacement worker on the upper surface of the car. In this case, the brake device 10 lifted by the hook or rope of the lifting device is transported at an angle, but this is not a particular problem since the main purpose is to prevent the brake device 10 from falling. In addition, in order to reliably prevent the brake device 10 from falling, it is preferable for the worker to keep the brake device 10 in contact with his or her hand when moving the brake device 10. By performing these operations, the replacement worker can move the brake device 10 detached from the hoist 6 to his or her side without dropping it.

[0037] FIG. 6(b) shows a step of mounting a replacement brake device prepared in advance on the hoist 6 with the aid of a lifting device. First, in step ST6, the bracket 20 is attached to the replacement brake device 10. That is, one bolt 10D is inserted into the bolt hole of the replacement brake device 10 that was placed on the upper surface of the car. At the same time, the bracket 20 is attached to the bolt 10D. That is, the bolt 10D is inserted through one fixing portion 20a, the core portion 10a, the armature portion 10b, and the other fixing portion 20a of the bracket 20 in that order. As a result, a gap 20d is formed between the bracket 20 and the brake device 10.

[0038] In order to prevent the bolt 10D thus inserted into the brake device 10 from moving in the axial direction, a nut can be screwed onto the tip end (the end opposite the head of the bolt) of the bolt 10D. Alternatively, such a problem can be avoided by threading the inner surface of the hole 20c of the fixing part 20a on the opposite side to the head side of the bolt 10D of the bracket 20 to screw into the bolt 10D, thereby giving the bracket 20 the same function as the nut.

[0039] Next, in step ST7, the replacement brake device 10 is lifted and moved by the lifting device. That is, the hook or rope of the lifting device is engaged with the bracket 20, and the brake device 10 is lifted with the assistance of the lifting device, and moved to the vicinity of the hoist 6. This makes it possible to prevent the brake device 10 from falling. Note that, when moving the brake device 10 at this time, it is preferable for the worker to keep the brake device 10 held by hand in order to reliably prevent it from falling.

[0040] Next, in step ST8, the brake device 10 is temporarily attached to the hoist 6 and the bracket 20 is removed. That is, the brake device 10 arranged near the hoist 6 is attached to the hoist 6 by inserting the other three bolts 10d while keeping the hook or rope engaged with the bracket 20. In this case, the other three bolts 10d are so-called temporarily attached so that their tips are slightly screwed into the hoist 6, and at the same time, the bolt 10D attaching the bracket 20 is completely removed from the brake device 10 and the bracket 20 is removed. At this point, the hook or rope of the lifting device is removed from the brake device 10.

[0041] Next, the brake device 10 is completely attached to the hoisting machine 6. That is, after removing the bracket 20, the bolt 10D removed from the brake device 10 is inserted again into the same bolt hole of the brake device 10, and then completely screwed together with the other three bolts 10d into the hoisting machine 6 to attach the brake device 10 to the hoisting machine 6. This completes the replacement of the brake device 10.

[0042] The above steps of replacing the brake device 10 show that when the brake device 10 is completely detached from the hoisting machine 6, or when a replacement brake device 10 is completely attached to the hoisting machine 6, the brake device 10 is always in a state of being locked by the hook or rope of the lifting device. This is to ensure that the lifting device can reliably prevent the brake device 10 from falling even if an obstacle such as the brake device 10 is encountered when detaching or attaching the brake device 10 to the hoisting machine 6.

[0043] (Embodiment 2) [Configuration of brake device with bracket attached] FIG. 7 is a diagram showing the configuration of the brake device 10 to which the brackets 30 are attached. FIG. 7 is a diagram corresponding to FIG. 3. FIG. 8 shows a perspective view of the brake device 10 shown in FIG. 7. Four brackets 30 are attached near four bolts 10d that attach the brake device 10 to the hoisting machine 6. The configurations of the brackets 30 are the same, and the attachment of each bracket 30 to the brake device 10 is also the same. However, the number of brackets 30 is not limited to this, and may be four or less, such as one, for example. For this reason, one bracket 30 will be described below.

[0044] The bracket 30 is composed of an L-shaped flat plate member made of, for example, metal. The bracket 30 has a locking hole 30c formed at the tip of one of the bent parts, and a hook or rope of a lifting device is locked to the locking hole 30c. That is, the periphery of the locking hole 30c of the bracket 30 serves as an engagement part 30b that engages with the lifting device, and the other part serves as a fixing part 30a to the brake device 10. A fixing hole 30d is formed almost directly below the locking hole 30c.

[0045] In the bracket 30 thus configured, the bent portion on the fixed portion 30a side (the bent portion on the side where the locking holes 30c and holes 30d are not formed) is housed in the groove 10c of the brake device 10, and the bent portion on the side where the locking holes 30c and holes 30d are formed is arranged to face and contact the side of the core portion 10a. At this time, the tip of the bent portion arranged to face the side of the core portion 10a is formed to protrude from the upper surface of the core portion 10a together with the locking holes 30c. This is because it is possible to easily lock the hook or rope of a lifting device into the locking holes 30c.

[0046] Furthermore, the bracket 30 is disposed on the brake device 10 so that a hole 10e (see FIG. 2) formed in the brake device 10 and a fixing hole 30d formed in the bracket 30 are coaxially aligned. The bracket 30 is attached to the brake device 10 by threading a bolt 31 through the fixing hole 30d of the bracket 30 and into the hole 10e of the brake device 10. In this case, it is effective to use a locking washer to prevent the bolt 31 from falling out as a measure to prevent the bolt from coming loose.

[0047] The bracket 30 is attached to the brake device 10 by one bolt 31, but since the other bent portion is housed within the groove portion 10c of the brake device 10, the bracket 30 is attached without swinging around the bolt 31.

[0048] [How to replace the brake system] Fig. 9 is a diagram showing steps of replacing the brake device 10 attached to the hoisting machine 6 with a replacement brake device 10. Fig. 9(a) shows a step of detaching the brake device 10 attached to the hoisting machine 6 from the hoisting machine 6 with the assistance of a lifting device.

[0049] First, in step ST1, the replacement worker attaches the bracket 30 to the brake device 10 attached to the hoisting machine 6. That is, the car is moved to the top of the elevator shaft 2 and brought close to the hoisting machine 6. The replacement worker for the brake device 10 stands on the upper surface of the car and faces the hoisting machine 6. At this time, the replacement worker has placed a new replacement brake device 10 on the upper surface of the car in advance. As shown in Figs. 7 and 8, the replacement worker attaches the L-shaped bracket 30 to the brake device 10 that is still attached to the hoisting machine 6. The work required for this is simply to place the bracket 30 in a fixed position on the brake device 10 and screw in the bolt 31.

[0050] Next, in step ST2, preparations are made for lifting the brake device 10 by a lifting device that has been installed in advance near the hoist 6. That is, a hook or rope connected to the frame of the lifting device is engaged with the engaging hole 30c of the bracket 30, and preparations are made for lifting the brake device 10 by the lifting device.

[0051] Next, in step ST3, the brake device 10 is detached from the hoisting machine 6. This detachment is performed by removing all four bolts 10d that attach the brake device 10 to the hoisting machine 6. In this case, the brake device 10 will not fall because it is already engaged with the lifting device.

[0052] Next, in step ST4, the brake device 10 is lifted and moved by the lifting device. That is, with the assistance of the lifting device, the brake device 10 detached from the hoisting machine 6 is lifted by a hook or rope of the lifting device and placed near the replacement worker on the upper surface of the car. In moving the brake device 10 at this time, it is preferable for the worker to keep the brake device 10 in contact with his / her hand in order to reliably prevent it from falling. Through these operations, the replacement worker can move the brake device 10 detached from the hoisting machine 6 to his / her side without dropping it.

[0053] 9(b) shows the steps of mounting a replacement brake device 10, which has been prepared in advance, to the hoist 6 with the aid of a lifting device. First, in step ST6, the bracket 30 is attached to the replacement brake device 10. The attachment in this case is similar to step ST1, and it is sufficient to simply place the bracket 30 on the replacement brake device 10 and screw in the bolt 31.

[0054] Next, in step ST7, a hook or rope of a lifting device is hooked to the bracket 30 of the braking device 10, and the braking device 10 is lifted with the assistance of the lifting device and moved to the vicinity of the hoist 6. Note that, in order to reliably prevent the braking device 10 from falling, it is preferable for the worker to keep the braking device 10 held by hand when moving the braking device 10.

[0055] Next, in step ST8, the braking device 10 is attached to the hoisting machine 6, and then the bracket 30 attached to the braking device 10 is removed to complete the process. The braking device 10 is attached to the hoisting machine 6 by screwing in the bolt 10e, and the bracket 30 is removed by removing the bolt 31.

[0056] The method for replacing the brake device 10 configured in this manner utilizes the existing hole 10e formed in advance in the brake device 10 to attach the bracket 30, and uses this bracket 30 to engage the hook or rope of the lifting device. Therefore, the brake device 10 can be replaced without setting new eye bolts or the like in the brake device 10. Therefore, since there is no deterioration in the magnetic force of the brake device 10, the brake device 10 can be made smaller.

[0057] (Embodiment 3) [Configuration of brake device with bracket attached] FIG. 10 is a diagram showing the configuration of the brake device 10 to which the bracket 40 is attached. FIG. 10 is a diagram corresponding to FIG. 7. FIG. 11 shows a perspective view of the brake device 10 shown in FIG. 10. In FIG. 10, two brackets 40 are attached to opposing side surfaces of the brake device 10. However, the number of brackets 40 is not limited to two, and one bracket may be used. Therefore, only one bracket 40 will be described below.

[0058] The bracket 40 is configured by arranging two identical L-shaped flat plate members side by side facing in the same direction, with a straight flat plate member integrally formed to span their tips. The L-shaped flat plate members serve as the fixing portion 40a to the brake device 10, and the straight flat plate member serves as the locking portion 40b to the lifting device. Each of the L-shaped flat plate members has a fixing hole 40c formed in a portion adjacent to the straight flat plate member.

[0059] The bracket 40 having such a configuration is arranged on the brake device 10 so that the bent portion of the L-shaped flat plate member (the bent portion opposite to the locking portion 40b) is in contact with the side surface of the core portion 10a while being housed in the groove portion 10c of the brake device 10. In this case, the fixing holes 40c of each L-shaped flat plate member are coaxially aligned with the existing holes 10e (see FIG. 2) of the brake device 10, and the linear flat plate members are arranged to protrude slightly from the upper surface of the core portion 10a, so that a gap 40d is generated between the upper surface of the core portion 10a and the straight plate members. This gap 40d is intended to make it easier for the hook or rope of the lifting device to be locked to the locking portion 40b of the bracket 40.

[0060] Then, the bracket 40 is attached to the brake device 10 by threading the bolt 41 into the hole 10e of the core portion 10a through the fixing hole 40c of each fixing portion 40a of the bracket 40. In this case, as a measure to prevent the bolt 41 from falling out, a retaining washer can be used to prevent the bolt 41 from falling out.

[0061] [How to replace the brake system] The steps for replacing the brake device 10 mounted on the hoisting machine 6 with a replacement brake device 10 are similar to the steps shown in Fig. 9. This is because, as in the second embodiment, the bracket 40 can be attached to and detached from the brake device 10 in a state in which the brake device 10 is mounted on the hoisting machine 6. Replacement of the brake device 10 using the above-mentioned bracket 40 ensures reliable suspension of the brake device 10 by the lifting device because the bracket 40 is fixed to the brake device 10 at two points.

[0062] As is clear from the above description, the method for replacing a brake device for an elevator hoist machine and the brake device of the present invention can be made smaller without degrading performance, and can be safely detached from and attached to the hoist machine with the assistance of the lifting device.

[0063] Although the present invention has been described above using the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope described in the above embodiments. It is clear to those skilled in the art that various modifications or improvements can be made to the above embodiments. In addition, it is clear from the description of the claims that forms with such modifications or improvements can also be included in the technical scope of the present invention. [Explanation of symbols]

[0064] 1: elevator, 2: hoistway, 3A: car side guide, 3B: counterweight side guide, 4: counterweight, 4A: counterweight hoist, 5: main rope, 6: hoist, 6A: sheave, 7: hoist support member, 8: governor, 8A: governor rope, 10: brake device, 10a: core, 10b: armature, 10c: groove, 10d: bolt, 10e: hole, 20: bracket, 20a: fixing part, 20b: locking part, 20c: hole, 20d: gap, 30: bracket, 30a: fixing part, 30b: locking part, 30c: locking hole, 30d: fixing hole, 31: bolt, 40: bracket, 40a: fixing part, 40b: locking part, 40c: fixing hole, 40d: gap, 41: bolt

Claims

1. A brake device is applied that is attached to an elevator hoist and includes a core portion that contains an electromagnetic core, and an armature portion that operates depending on the presence or absence of magnetic force of the core portion to apply a brake to the hoist, A method for replacing the brake device attached to the hoisting machine by a plurality of bolts penetrating from the core portion to the armature portion with the assistance of a lifting device, A step of disposing a bracket on the brake device, the bracket having a fixing portion disposed so as to pass through any one of the plurality of bolts and a locking portion extending from the fixing portion; a step of engaging the engaging portion of the bracket with a rope or a hook of the lifting device; and a step of removing the brake device from the hoisting machine or attaching the brake device to the hoisting machine while retaining at least the optional bolt that fixes the bracket in the brake device.

2. A brake device that is attached to an elevator hoist and includes a core portion that contains an electromagnetic core, and an armature portion that operates depending on the presence or absence of a magnetic force of the core portion to apply a brake to the hoist, The brake device is attached to the hoist by a bolt that penetrates from the core portion to the armature portion, A brake device for an elevator hoist, comprising a bracket having a fixing portion that is disposed through the bolt and a locking portion that locks a hook or rope of a lifting device.

3. 3. The brake device for an elevator hoist as claimed in claim 2, wherein the bracket is U-shaped, has a fixing portion at one bent end which is penetrated by a bolt between the bolt head and the core portion, and has a fixing portion at the other bent end which is penetrated by a bolt between the hoist and the armature portion, and has a locking portion provided along a side surface of the core portion and the armature portion between these fixing portions.

4. 4. The brake device for an elevator hoist as claimed in claim 3, wherein a fixing portion of a bracket between the hoist and the armature is screwed onto the bolt.

5. The device is equipped with a core part that is attached to an elevator hoist and contains an electromagnetic core, and an armature part that operates depending on the presence or absence of magnetic force of the core part and applies a brake to the hoist, A method for replacing a brake device having a hole formed in the core portion with another brake device with the assistance of a lifting device, comprising: Attaching a bracket to the brake device, the bracket having a fixing portion that is fixed using the hole and a locking portion that extends from the fixing portion; a step of engaging the engaging portion of the bracket with a rope or a hook of the lifting device; removing the brake device from the hoisting machine or attaching the brake device to the hoisting machine; removing the bracket from the brake device; A method for replacing a brake device of an elevator hoisting machine, comprising:

6. The device is equipped with a core part that is attached to an elevator hoist and contains an electromagnetic core, and an armature part that operates depending on the presence or absence of magnetic force of the core part and applies a brake to the hoist, A brake device having a hole formed in the core portion, The brake device of an elevator hoist, characterized in that the brake device comprises a bracket having a fixing part that is fixed through the hole formed in the core part, and a locking part to which a hook or rope of a lifting device is locked.

7. The brake device has a groove between the core portion and the armature portion, the bracket is made of an L-shaped plate-like member, one bent portion is housed in the groove portion, and the other bent portion is in contact with the side surface of the core portion and extends beyond the upper surface of the core portion, the engaging portion having an engaging hole at its tip is formed, and a fixing hole is formed and arranged coaxially coincident with the hole of the core portion, The brake device for an elevator hoist according to claim 6, wherein the bracket is attached to the brake device by a bolt that is inserted into the hole of the core portion through the fixing hole.

8. The brake device has a groove between the core portion and the armature portion, The bracket is composed of a pair of L-shaped plate members arranged side by side and oriented in the same direction, and a linear plate member connecting tips of one bent portion of the L-shaped plate members, and a fixing hole is formed in each of the L-shaped plate members, the bracket is arranged such that the other bent portion of each L-shaped plate member is housed in the groove portion, the other bent portion of each L-shaped plate member faces and contacts a side surface of the core portion, a gap is formed between the linear plate member and an upper surface of the core portion, and the fixing hole formed in each L-shaped plate member is coaxially aligned with the hole in the core portion, The brake device for an elevator hoist according to claim 6, wherein the bracket is attached to the brake device by a bolt that is inserted into the hole of the core portion through the fixing hole.

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