Method for replacing the brake device of an elevator hoisting machine and the brake device itself

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

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[0005]

[0001] The present invention relates to a method for replacing a brake device of a hoist of an elevator and the brake device.

Background Art

[0002] A so-called machine-roomless elevator without a machine room for arranging a hoist is provided with a hoist on a hoist support member installed, for example, at the uppermost part of a hoistway. A main rope with a car supported at one end and a counterweight supported at 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 of the hoist.

[0003] A hoist for vertically driving an elevator car of an elevator is provided with a large brake device. The brake device of the hoist is regularly replaced for safety. The vicinity where the hoist is installed is extremely narrow, and the replacement work of the brake device is accompanied by spatial constraints. In the replacement work of the brake device, for example, the car is arranged at the uppermost part, and an operator rides on the upper surface part of the car to perform the work.

[0004] In the replacement work of a large brake device in such an extremely narrow space, usually, from the viewpoint of preventing the brake device from falling, it is necessary to lift the brake device using a hoisting device and detach and attach it to the hoist in a lifted state. In this case, the brake device is provided with a hole for inserting an eyebolt, and an eyebolt is set on the brake device at the time of replacing the brake device, and it is lifted by a hook or a rope of the hoisting device through this eyebolt. Techniques related to such replacement work of the brake device are disclosed in Patent Document 1 and Patent Document 2.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] For the reasons mentioned above, there has been a growing demand in recent years for miniaturization of brake systems, which often need to be replaced in extremely confined spaces. Miniaturization would allow for more efficient replacement work within these limited spaces, thus ensuring safety.

[0007] However, on the other hand, a braking device incorporates an electromagnetic core that forms a magnetic field and an armature that is operated by this electromagnetic core. The magnetic force from the electromagnetic core and the mechanical force from the armature must be kept at certain values, which imposes constraints on miniaturization.

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

[0009] The present invention relates to a method for replacing the brake device of an elevator hoisting machine, and the brake device is attached to the elevator hoisting machine and comprises a core portion containing an electromagnetic core and an armature portion that operates depending on the presence or absence of magnetic force in the core portion to apply braking to the hoisting machine. The brake device is attached to the hoisting machine by a plurality of bolts that pass through from the core portion to the armature portion, 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, which has a fixing portion that penetrates any of the multiple bolts and a locking portion that extends from the fixing portion. The locking portion of the bracket is then secured by a hook or rope of the lifting device, and the brake device is detached from or attached to the hoisting machine while the brake device holds at least one of the bolts that fixes the bracket.

[0011] Furthermore, the brake device of the present invention is attached to the hoisting machine of an elevator and comprises a core portion containing an electromagnetic core and an armature portion that operates depending on the presence or absence of magnetic force in the core portion to brake the hoisting machine. The brake device is attached to the hoisting machine by a bolt that passes through the core portion to the armature portion and comprises a bracket having a fixing portion positioned through the bolt and a locking portion for locking the hook or rope of the lifting device. [Effects of the Invention]

[0012] The brake device replacement method and brake device configured in this way avoid the formation of holes for installing eye bolts and the like in the brake device, and the brake device replacement work can be performed with the assistance of a lifting device simply by attaching a bracket to the brake device. The formation of holes for installing eye bolts and the like in the brake device has been a reason that hinders the improvement of magnetic flux density by the electromagnetic core, so avoiding the formation of these holes allows for an improvement in the magnetic flux density of the magnetic force from the electromagnetic core, and in turn, allows for miniaturization of the brake device.

[0013] Therefore, according to the present invention's method for replacing the brake device of an elevator hoisting machine, miniaturization is possible, and the brake device can be safely detached from the hoisting machine with the assistance of a lifting device, preventing it from falling. [Brief explanation of the drawing]

[0014] [Figure 1] This is a schematic diagram of an elevator to which the present invention is applied. [Figure 2]This is a diagram showing the appearance of the braking device when mounted on the winding machine. [Figure 3] This is a diagram showing Embodiment 1 of the present invention, and is a diagram showing the configuration when the bracket is attached to the braking device. [Figure 4] This is a perspective view of the configuration shown in FIG. 3. [Figure 5] This is a perspective view showing a partial decomposition of the configuration shown in FIG. 3. [Figure 6] This is a diagram showing Embodiment 1 of the present invention, and is a step diagram showing the method of replacing the braking device. [Figure 7] This is a diagram showing Embodiment 2 of the present invention, and is a diagram showing the configuration when the bracket is attached to the braking device. [Figure 8] This is a perspective view of the configuration shown in FIG. 7. [Figure 9] This is a diagram showing Embodiment 2 of the present invention, and is a step diagram showing the method of replacing the braking device. [Figure 10] This is a diagram showing Embodiment 3 of the present invention, and is a diagram showing the configuration when the bracket is attached to the braking device. [Figure 11] This is a perspective view of the configuration shown in FIG. 10. [Embodiments for Carrying Out the Invention]

[0015] Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. The same elements are given the same numbers throughout the description of the embodiments. (Embodiment 1)

[0016] [Schematic Configuration of Elevator] Fig. 1 is a schematic diagram showing an elevator 1. As shown in Fig. 1, the elevator 1 has no machine room for arranging a hoist 6 and has a so-called machine-roomless configuration in which the hoist 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 suspension 4A provided on the counterweight 4 and connected to a hoist support member 7. The main rope 5 is wound around a sheave 6A of the hoist 6. When the hoist 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 hoist 6 is installed on a hoist support member 7 provided at the uppermost part of the hoistway 2. Further, a sheave 6A is attached to the hoist 6 via a rotating shaft. And, for example, two brake devices 10 are attached to the outer peripheral portion of the hoist 6. The number of the brake devices 10 is not limited to two and may be one. The brake device 10 is configured to brake the rotation of the sheave 6A of the hoist 6 when necessary.

[0018] Also, Fig. 1 shows a car-side guide 3A for guiding the travel of the car, a counterweight-side guide 3B for guiding the travel of the counterweight 4, and a speed governor 8 for detecting the speed of the car. The speed governor 8 winds a governor rope 8A that moves according to the travel of the car.

[0019] In the elevator 1 configured as described above, a weight lifting device (not shown) is installed near the hoist 6. The weight lifting device is a device for assisting in the replacement work of the brake device 10 attached to the hoist 6. Therefore, the weight lifting device is not permanently installed near the hoist 6, but is installed when performing the replacement work of the brake device 10 and is removed after the replacement work is completed. The weight lifting device includes a hook suspended from its frame, and the hook can move horizontally and vertically. Note that the weight lifting device is not limited to one provided with a hook and may be only a rope.

[0020] [Brake System Configuration] Figure 2 shows the external appearance of the brake device 10 when mounted on the hoisting machine 6. Figure 2(a) is a top view, Figure 2(b) is a side view, and Figure 2(c) is another side view perpendicular to the aforementioned side view. The brake device 10 consists of a core part 10a and an armature part 10b. The core part 10a and the armature part 10b each have an outer frame made of a rectangular shape. The core part 10a and the armature part 10b are stacked and formed as a single unit.

[0021] A groove 10c, consisting of a narrow gap between the core portion 10a and the armature portion 10b, is formed on one side of the brake device 10 and the opposing surface facing this side. The brake device 10 is attached to the hoisting machine 6 by bolts 10d that pass through from the core portion 10a to the armature portion 10b. The bolts 10d have their heads on the side facing the core portion 10a, and four of them are arranged near each of the four corners of the core portion 10a. The number of bolts 10d is not necessarily limited to four; there may be three or five or more. The tip of each bolt 10d (the end opposite the head) is screwed into the hoisting machine 6, thereby attaching the brake device 10 to the hoisting machine 6. Each bolt 10d that passes through the core portion 10a and the armature portion 10b passes through the region in which the groove 10c is formed.

[0022] As shown in Figure 2(c), holes 10e are formed at the upper corners of both the side surface where the groove 10c is formed and the surface opposite to this side surface of the brake device 10. These holes 10e are formed for attaching a dust cover to the brake device 10.

[0023] The internal mechanism of the brake device 10 is based on known technology, so we will briefly explain it using an example. The core section 10a houses an electromagnetic core equipped with an electromagnetic coil. The armature section 10b houses an armature positioned opposite the magnetic attraction surface of the electromagnetic core, a biasing member that biases the armature away from the electromagnetic core, and a pair of brake levers that are attached to the surfaces of the electromagnetic core and armature opposite to their respective magnetic attraction surfaces and apply pressure to the braking surfaces on both sides of the sheave 6A, which operates against the biasing member when the electromagnetic core is energized. A pivot axis is formed approximately in the center of each brake lever, and a brake shoe is attached to the tip of each brake lever.

[0024] In this braking device 10, when the hoisting machine 6 is in operation, the electromagnetic coil of the electromagnetic core is energized, and the armature is attracted to the magnetic adsorption surface of the electromagnetic core against the biasing force of the biasing member. The pair of brake levers each rotate around a pivot axis formed approximately in the middle. The pair of brake shoes then move away from the respective braking surfaces of the sheave 6A. When the hoisting machine 6 stops, the energization to the electromagnetic coil is stopped, and the magnetism of the electromagnetic core is extinguished. The electromagnetic core and armature are then biased by the biasing member and move away from each other. The pair of brake levers rotate around the pivot axis, and each brake shoe presses against the respective braking surfaces of the sheave 6A, thereby braking the sheave 6A. It should be noted that the braking device 10 to which the present invention applies is not limited to the mechanism and operation described above; any braking device 10 incorporating a magnetic core can be applied to the implementation of the present invention.

[0025] [Configuration of the brake device with the bracket attached] The method for replacing the brake device 10 of the hoisting machine 6 of the elevator 1 according to the present invention requires the installation and subsequent removal of a bracket 20 from the brake device 10 during the replacement process. Figure 3 shows the configuration when the bracket 20 is installed on the brake device 10. Figure 3 corresponds to Figure 2. Figure 4 is a perspective view of the brake device 10 shown in Figure 3.

[0026] The bracket 20 is attached to one of the four bolts 10d that attach the brake device 10 to the hoisting machine 6, specifically bolt 10D. The bracket 20 is made of a U-shaped flat plate member, for example, made of metal. As shown in Figure 5, which corresponds to Figure 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. The bent ends constitute the fixing portion 20a to the brake device 10, and the portion between these ends constitutes the locking portion 20b for the hook or rope of the lifting device.

[0027] As shown in Figure 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 hoisting machine 6. As shown in Figure 5, holes 20c are formed in each fixing portion 20a at both ends of the bracket 20. That is, the bracket 20 is fixed to the brake device 10 by the bolt 10D passing through the holes 20c in each fixing portion 20a of the bracket 20. As shown in Figure 3(b), the locking portion 20b of the bracket 20 forms a gap 20d between it and the brake device 10, and the hook or rope of the lifting device can be locked to the locking portion 20b through this gap 20d.

[0028] The bracket 20 described above is shown as having a U-shape as an example, but it is not limited to this shape. It may be L-shaped or any other shape as long as it can be attached by passing the bolt 10D through it.

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

[0030] First, in step ST1, the replacement worker attaches the bracket 20 to the bolt 10D of the brake device 10 which is mounted on the hoisting machine 6. That is, the elevator 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 top surface of the elevator car, facing the hoisting machine 6. At this time, the replacement worker has already positioned the new replacement brake device 10 on the top surface of the elevator car. The replacement worker removes one of the four bolts 10d that attach the brake device 10 to the hoisting machine 6, bolt 10D, from the brake device 10, and then inserts the same or a different bolt 10D into the same bolt hole of the brake device 10. At this time, the bracket 20 shown in Figures 3 to 5 is passed through the bolt 10D on the brake device 10.

[0031] As shown in Figures 3 to 5, the bracket 20 is U-shaped, with the bent portions at both ends serving as fixing portions 20a for the bolt 10D, and the portion between the fixing portions 20a serving as a locking portion 20b for securing the hook or rope of the lifting device. The fixing portion 20a is provided with a hole 20c through which the bolt 10D passes. 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 to lift the brake device 10 using a lifting device that has been pre-installed near the hoisting machine 6. Specifically, 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 locked to the locking part 20b, preparing to lift the brake device 10 using the lifting device.

[0033] Next, in step ST3, remove all bolts 10d except for the bolt 10D that attaches the bracket 20. That is, remove the three bolts 10d other than the bolt 10D that attaches the bracket 20 from the four bolts 10d that attach the brake device 10 to the hoisting machine 6. In this case, each bolt 10d may be left inside the brake device 10 to the extent that it is released from being screwed into the hoisting machine 6. This is because the removal of each bolt 10d can be done at any time afterward.

[0034] Next, in step ST4, the bolt 10D that attaches the bracket 20 is unscrewed from the hoisting machine 6. That is, the removal of the bolt 10D that attaches the bracket 20 is limited to unscrewing it from the hoisting machine 6. At this time, the bracket 20 remains attached to the bolt 10D remaining inside the brake device 10, and the bracket 20 is secured to the hook or rope connected to the lifting device, thereby preventing the brake device 10 from falling.

[0035] Furthermore, the inconvenience of the bolt 10D, which attaches the bracket 20, becoming more easily moved in its axial direction when the bolt 10D is released from the hoisting machine 6 can be avoided by screwing a nut onto the tip of the bolt 10D (the end opposite the bolt head). Alternatively, this inconvenience can also be avoided by threading a hole 20c on the inner surface of the fixing part 20a of the bracket 20 opposite the bolt 10D head side, 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, which has been detached from the hoisting machine 6, is lifted by the hook or rope of the lifting device and placed near the replacement worker on the upper surface of the elevator car. In this case, the brake device 10, which has been lifted by the hook or rope of the lifting device, is transported at an angle, but this is not a problem as the main purpose is to prevent the brake device 10 from falling. When moving the brake device 10 at this time, it is preferable for the worker to hold the brake device 10 in place with their hand in order to reliably prevent it from falling. Through these operations, the replacement worker can move the brake device 10, which has been detached from the hoisting machine 6, to their hand without dropping it.

[0037] Figure 6(b) shows the steps for attaching a pre-prepared replacement brake device to the hoisting machine 6 with the assistance 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, which is located on the upper surface of the elevator car. At the same time, the bracket 20 is attached to the bolt 10D. That is, the bolt 10D is inserted by sequentially passing through one fixing part 20a, core part 10a, armature part 10b, and the other fixing part 20a of the bracket 20. As a result, a gap 20d is formed between the bracket 20 and the brake device 10.

[0038] Furthermore, to prevent the bolt 10D inserted into the brake device 10 from moving in its axial direction, a nut can be screwed onto the tip of the bolt 10D (the end opposite the bolt head). Alternatively, this inconvenience can be avoided by screwing a thread into the inner surface of the hole 20c of the fixing part 20a on the opposite side of the bolt 10D of the bracket 20, 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 using the lifting device. That is, the hook or rope of the lifting device is attached to the bracket 20, and with the assistance of the lifting device, the brake device 10 is lifted and moved to the vicinity of the hoisting machine 6. This prevents the brake device 10 from falling. When moving the brake device 10 at this time, it is preferable for the worker to hold the brake device 10 in place by hand in order to reliably prevent it from falling.

[0040] Next, in step ST8, the brake device 10 is temporarily fastened to the hoisting machine 6 and the bracket 20 is removed. That is, the brake device 10, which is located near the hoisting machine 6, is attached to the hoisting machine 6 by inserting the other three bolts 10d while the hook or rope is still attached to the bracket 20. In this case, the other three bolts 10d are temporarily fastened so that their ends are slightly screwed into the hoisting machine 6, and at the same time, the bolt 10D to which the bracket 20 is attached 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 fully attached to the hoisting machine 6. That is, after removing the bracket 20, the bolt 10D that was removed from the brake device 10 is reinserted into the same bolt hole of the brake device 10, and together with the other three bolts 10d, it is fully screwed into the hoisting machine 6, thereby attaching the brake device 10 to the hoisting machine 6. This completes the replacement of the brake device 10.

[0042] The above steps for replacing the brake device 10 demonstrate that when the brake device 10 is completely detached from the hoisting machine 6, or when the replacement brake device 10 is completely attached to the hoisting machine 6, it must always be secured 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 if there is any obstruction during the detachment or attachment of the brake device 10 to the hoisting machine 6.

[0043] (Embodiment 2) [Configuration of the brake device with the bracket attached] Figure 7 shows the configuration of the brake device 10 with the brackets 30 attached. Figure 7 corresponds to Figure 3. Figure 8 shows a perspective view of the brake device 10 shown in Figure 7. Four brackets 30 are attached near the four bolts 10d that attach the brake device 10 to the hoisting machine 6. The configuration of each bracket 30 is 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, for example, one. For this reason, a single bracket 30 will be described below.

[0044] The bracket 30 is composed of an L-shaped flat plate member, for example, made of metal. A locking hole 30c is formed at the tip of one of the bent portions of the bracket 30, and the hook or rope of the lifting device is locked into this locking hole 30c. That is, the area around the locking hole 30c of the bracket 30 is an engaging portion 30b that engages with the lifting device, and the other portion is a fixing portion 30a that attaches to the brake device 10. A fixing hole 30d is formed almost directly below the locking hole 30c.

[0045] In this configuration, the bracket 30 has the bent portion on the fixing portion 30a side (the bent portion on the side where the locking holes 30c and 30d are not formed) housed within the groove portion 10c of the brake device 10, and the bent portion on the side where the locking holes 30c and 30d are formed is positioned in contact with the side surface of the core portion 10a. At this time, the tip of the bent portion positioned facing the side surface of the core portion 10a is formed to protrude from the upper surface of the core portion 10a together with the locking hole 30c. This is to make it easier to lock the hook or rope of the lifting device into the locking hole 30c.

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

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

[0048] [How to replace the brake system] Figure 9 shows the steps for replacing the brake device 10 attached to the hoisting machine 6 with a replacement brake device 10. Figure 9(a) shows the steps for detaching the brake device 10 attached to the hoisting machine 6 with the assistance of the lifting device.

[0049] First, in step ST1, the replacement worker attaches the bracket 30 to the brake device 10 mounted on the hoisting machine 6. That is, the elevator car is moved to the top of the hoistway 2 and brought close to the hoisting machine 6. The replacement worker for the brake device 10 stands on the top surface of the elevator car, facing the hoisting machine 6. At this time, the replacement worker has already positioned the new replacement brake device 10 on the top surface of the elevator car. As shown in Figures 7 and 8, the replacement worker attaches the L-shaped bracket 30 to the brake device 10, which is still mounted on the hoisting machine 6. This work only requires placing the bracket 30 in the designated position on the brake device 10 and screwing in the bolt 31.

[0050] Next, in step ST2, preparations are made to lift the brake device 10 using a lifting device that has been pre-installed near the hoisting machine 6. Specifically, a hook or rope connected to the frame of the lifting device is locked into the locking hole 30c of the bracket 30, and preparations are made to lift the brake device 10 using the lifting device.

[0051] Next, in step ST3, the brake device 10 is detached from the hoisting machine 6. This detachment is achieved 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 secured to 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, which has been detached from the hoisting machine 6, is lifted by the hook or rope of the lifting device and positioned near the replacement worker on the upper surface of the elevator car. When moving the brake device 10 at this time, it is preferable for the worker to hold the brake device 10 in their hand while doing so in order to reliably prevent it from falling. Through these operations, the replacement worker can move the brake device 10, which has been detached from the hoisting machine 6, to their hand without dropping it.

[0053] Figure 9(b) shows the steps for attaching a pre-prepared replacement brake device 10 to the hoisting machine 6 with the assistance of the lifting device. First, in step ST6, the bracket 30 is attached to the replacement brake device 10. The attachment in this case is the same as in step ST1, and only the bracket 30 is placed against the replacement brake device 10 and the bolt 31 is screwed in.

[0054] Next, in step ST7, the hook or rope of the lifting device is attached to the bracket 30 of the brake device 10, and the brake device 10 is lifted with the assistance of the lifting device and moved to the vicinity of the hoisting machine 6. When moving the brake device 10 at this time, it is preferable for the worker to hold the brake device 10 in place with their hand in order to reliably prevent it from falling.

[0055] Next, in step ST8, the brake device 10 is attached to the hoisting machine 6, and then the bracket 30 attached to the brake device 10 is removed to complete the process. The brake 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 way involves attaching a bracket 30 using an existing hole 10e that is pre-formed in the brake device 10, and using this bracket 30 to secure the hook or rope of the lifting device. Therefore, the brake device 10 can be replaced without setting up new eye bolts or the like in the brake device 10. Consequently, there is no deterioration of the magnetic force of the brake device 10, and the brake device 10 can be made smaller.

[0057] (Embodiment 3) [Configuration of the brake device with the bracket attached] Figure 10 shows the configuration of the brake device 10 with the brackets 40 attached. Figure 10 corresponds to Figure 7. Figure 11 shows a perspective view of the brake device 10 shown in Figure 10. In Figure 10, two brackets 40 are attached to opposing sides of the brake device 10. However, it is not limited to two; one may be used. Therefore, only the case of a single bracket 40 will be described below.

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

[0059] The bracket 40, having this configuration, is positioned on the brake device 10 such that the bent portion of the L-shaped plate member (the bent portion opposite to the locking portion 40b) is housed in the groove 10c of the brake device 10 and is in opposing contact with the side surface of the core portion 10a. In this case, the fixing holes 40c of each L-shaped plate member are coaxially aligned with the existing holes 10e (see Figure 2) of the brake device 10, and the straight plate member is positioned to protrude slightly from the upper surface of the core portion 10a, creating a gap 40d between it and the upper surface of the core portion 10a. This gap 40d is intended to facilitate the locking of the lifting device's hook or rope to the locking portion 40b of the bracket 40.

[0060] Then, the bracket 40 is attached to the brake device 10 by screwing the bolt 41 through the fixing holes 40c of each fixing part 40a of the bracket 40 into the holes 10e of the core part 10a. In this case, retaining washers can be used to prevent the bolt 41 from falling out.

[0061] [How to replace the brake system] The step of replacing the brake device 10 attached to the hoisting machine 6 with a replacement brake device 10 is the same as the step shown in Figure 9. This is because, as in Embodiment 2, the bracket 40 can be attached to and detached from the brake device 10 while the brake device 10 is attached to the hoisting machine 6. Replacing the brake device 10 using the bracket 40 described above makes it possible to ensure reliability in suspending the brake device 10 by the lifting device, as the bracket 40 is fixed to the brake device 10 at two points.

[0062] As is clear from the above explanation, the method for replacing the brake device of an elevator hoisting machine and the brake device of the present invention according to the present invention make it possible to miniaturize the device without degrading its performance, and to safely detach and attach it to the hoisting machine with the assistance of a lifting device.

[0063] Although the present invention has been described above using 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 will be obvious to those skilled in the art that various modifications or improvements can be made to the above embodiments. Furthermore, it is clear from the claims that such modified or improved forms may 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 suspension wheel, 5: Main rope, 6: Hoisting machine, 6A: Sheave, 7: Hoisting machine support member, 8: Governor, 8A: Governor rope, 10: Brake device, 10a: Core section, 10b: Armor section, 10c: Groove section, 10d: Bolt, 10e: Hole, 20: Bracket, 20a: Fixing section, 20b: Locking section, 20c: Hole, 20d: Gap, 30: Bracket, 30a: Fixing section, 30b: Locking section, 30c: Locking hole, 30d: Fixing hole, 31: Bolt, 40: Bracket, 40a: Fixing section, 40b: Locking section, 40c: Fixing hole, 40d: Gap, 41: Bolt

Claims

1. A braking device is applied to an elevator hoisting machine, comprising a core section containing an electromagnetic core, and an armature section that operates depending on the presence or absence of magnetic force in the core section to brake the hoisting machine. A method for replacing the brake device attached to the hoisting machine by a plurality of bolts that penetrate from the core portion to the armature portion, with the assistance of a lifting device, The step of placing a bracket having a fixing portion that penetrates any of the multiple bolts and a locking portion that extends from the fixing portion into the brake device, The steps include: locking the bracket to the locking portion by the rope or hook of the lifting device; A method for replacing a brake device of an elevator hoisting machine, comprising the steps of removing the brake device from the hoisting machine or attaching it to the hoisting machine while the brake device retains at least one of the bolts used to secure the bracket.

2. A braking device mounted on an elevator hoisting machine, comprising a core section containing an electromagnetic core, and an armature section that operates depending on the presence or absence of magnetic force in the core section to brake the hoisting machine, The brake device is attached to the hoisting machine by bolts that pass through the core portion to the armature portion. A brake device for an elevator hoisting machine, characterized by comprising a bracket having a fixing portion that penetrates the bolt and a locking portion for locking a hook or rope of a lifting device.

3. The brake device for an elevator hoisting machine according to claim 2, characterized in that the bracket is U-shaped, has a fixing portion that passes through the bolt between the head of the bolt and the core portion at one bent end, and a fixing portion that passes through the bolt between the hoisting machine and the armature portion at the other bent end, and has locking portions provided between each of these fixing portions along the sides of the core portion and the armature portion.

4. The brake device for an elevator hoisting machine according to claim 3, characterized in that the fixing portion of the bracket between the hoisting machine and the armature section is screwed onto the bolt.

5. It is mounted on an elevator hoisting machine and comprises a core section containing an electromagnetic core, and an armature section that operates depending on the presence or absence of magnetic force in the core section to brake the hoisting machine. A method for replacing a brake device with another brake device with the assistance of a lifting device, wherein a hole is formed in the core portion of the brake device, A step of attaching a bracket having a fixing portion that is fixed using the aforementioned hole and a locking portion that extends from the fixing portion to the brake device, The steps include: locking the bracket to the locking portion by the rope or hook of the lifting device; The steps include removing the brake device from the hoisting machine or attaching the brake device to the hoisting machine, The steps include removing the bracket from the brake device, A method for replacing the brake device of an elevator hoisting machine, characterized by including [a specific component].

6. It is mounted on an elevator hoisting machine and comprises a core section containing an electromagnetic core, and an armature section that operates depending on the presence or absence of magnetic force in the core section to brake the hoisting machine. A brake device having a hole formed in the core portion, The brake device for an elevator hoisting machine is characterized by comprising a bracket having a fixing portion that is fixed through the hole formed in the core portion and a locking portion to which a hook or rope of a lifting device is locked.

7. The brake device has a groove between the core and the armature. The bracket consists of an L-shaped plate-like member, with one bent portion housed in the groove, and the other bent portion facing the side surface of the core portion and extending beyond the upper surface of the core portion, with a locking hole provided at its tip to form the locking portion, and furthermore, a fixing hole is formed and positioned coaxially with the hole in the core portion. The brake device for an elevator hoisting machine according to claim 6, characterized in that the bracket is attached to the brake device by a bolt inserted through the fixing hole into the hole in the core.

8. The brake device has a groove between the core and the armature. The bracket consists of a pair of L-shaped plate members arranged side by side and oriented in the same direction, and a straight plate member connecting the ends of one of the bent portions of these L-shaped plate members, with fixing holes formed in each of the L-shaped plate members. The bracket is such that the other bent portion of each L-shaped plate member is housed in the groove, the other bent portion of each L-shaped plate member is in contact with the side surface of the core, the straight plate member has a gap between it and the upper surface of the core, and the fixing holes formed in each L-shaped plate member are aligned coaxially with the holes in the core. The brake device for an elevator hoisting machine according to claim 6, characterized in that the bracket is attached to the brake device by a bolt inserted through the fixing hole into the hole in the core.

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