Elevator hoisting machine

Abstract

To provide an elevator hoisting machine capable of reducing the labor required for maintenance and inspection work. [Solution] The elevator hoist (20) comprises a sheave (21) on which the main rope is stretched, a movable unit (42) including a lining (43) that applies a braking force to the sheave (21), and a braking mechanism (32) including a main body (54) that houses a plunger (53) provided with a rod (53A) that abuts against an adjustment bolt (46) attached to the movable unit (43), and a biasing unit (52) that displaces the movable unit (42) to a position where no braking force is applied by the abutment surface of the rod (53A) pressing the adjustment bolt (46) against the biasing force of the compression spring (45) when the main body (54) is in an energized state, and the adjustment bolt (46) is provided with a tubular member (60) with a threaded hole that is screwed onto the rod (53A) in a state where it can be displaced in a direction toward or away from the rod (53A).

Description

[Technical Field]

[0001] The present invention relates to an elevator hoist provided in an elevator that raises and lowers a car via a main rope. [Background technology]

[0002] The elevator hoisting machine includes a sheave on which a main rope for raising and lowering a car is stretched, and a braking mechanism for applying a braking force to the sheave. The braking mechanism includes a movable unit that applies a braking force to the sheave using a sliding member, and a biasing unit that biases the movable unit. The movable unit is constantly biased in a direction that applies a braking force to the sheave, and when this braking force is to be released, the biasing unit biases the movable unit in the direction opposite to the biasing force, thereby releasing the braked state of the sheave.

[0003] This biasing unit includes a plunger attached with a rod and a main body composed of a coil or the like, and the rod is arranged to protrude from the main body, and when the main body is energized, the plunger moves a predetermined distance due to magnetic force, causing the rod to bias the movable unit so that the braking force of the movable unit does not act on the sheave.On the other hand, when the main body is deenergized, the rod is pushed back by the biasing force of the movable unit, causing the plunger to be pushed back the predetermined distance, causing the braking force to act on the sheave.

[0004] Patent Document 1 discloses an elevator hoist that includes a lining (sliding member) and a lever to which the lining is attached, and that is configured so that the lining is pressed against a rotating body via the lever by the biasing force of a first biasing member, and that is equipped with a braking mechanism that is configured to move the lever in a direction that moves the lining away from the rotating body using an actuator (main body) that includes a movable iron core (plunger). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6674666 Summary of the Invention [Problem to be solved by the invention]

[0006] During maintenance and inspection, it is necessary to measure the length of the rod protruding from the main body when the power is off to confirm that the plunger is being driven properly. However, because the rod is constantly biased by the movable unit, it is difficult to measure the length of the rod protruding from the main body, which makes maintenance and inspection work time-consuming.

[0007] An object of the present invention is to provide an elevator hoisting machine that can reduce the effort required for maintenance and inspection work. [Means for solving the problem]

[0008] The elevator hoist of the present invention comprises a sheave on which an elevator main rope is stretched, a movable unit including a sliding member that applies a braking force to the sheave and a biasing member that biases the sliding member in a direction pressing the sheave, and a braking mechanism including a main body that stores a plunger provided with a rod that abuts against a bolt attached to the movable unit, and when the main body is in an energized state, the rod presses the bolt against the biasing force of the biasing member, thereby displacing the movable unit to a position where no braking force is applied, and the bolt is provided with a tubular member that is screwed onto the rod in a state where it can be displaced in a direction toward or away from the rod. The cylindrical member has an opening for visually checking the position of the rod. It is something.

[0009] Elevator hoist of the present invention The braking mechanism includes a sheave on which an elevator main rope is stretched, a movable unit including a sliding member that applies a braking force to the sheave and a biasing member that biases the sliding member in a direction pressing the sheave against the sheave, and a main body that stores a plunger provided with a rod that abuts against a bolt attached to the movable unit, and when the main body is in an energized state, the rod presses the bolt against the biasing force of the biasing member, thereby displacing the movable unit to a position where no braking force is applied, and the bolt is provided with a tubular member that is screwed onto the rod in a state where it can be displaced in a direction approaching or moving away from the rod, and the tubular member is provided with a measurement reference surface that is approximately parallel to a main body reference surface provided on the main body when the tubular member abuts against or is close to the rod.

[0010] Elevator hoist of the present invention The braking mechanism includes a sheave on which an elevator main rope is stretched, a movable unit including a sliding member that applies a braking force to the sheave and a biasing member that biases the sliding member in a direction pressing the sheave against the sheave, and a main body that stores a plunger provided with a rod that abuts against a bolt attached to the movable unit, and when the main body is in an energized state, the rod presses the bolt against the biasing force of the biasing member, thereby displacing the movable unit to a position where the braking force does not act, and the braking mechanism includes a cylindrical member that is screwed onto the bolt in a state where it can be displaced in a direction toward or away from the rod, and the cylindrical member is biased in a direction away from the main body by a brake release lever inserted between the cylindrical member and the main body, thereby displacing the bolt to a position where the braking force does not act. [Effects of the Invention]

[0012] In the elevator hoist according to the present invention, the tubular member is threaded onto the bolt in a state in which it can be displaced toward or away from the rod. Therefore, the length from the main body to the tubular member can be measured with the tubular member in contact with or in proximity to the rod. The length of the tubular member portion included in the length from the main body to the tubular member is a constant length. Therefore, the length of the rod protruding from the main body can be confirmed by subtracting the length of the tubular member portion from the length from the main body to the tubular member. This reduces the effort required to measure the length of the rod protruding from the main body. As a result, the effort required for maintenance and inspection work can be reduced. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of an elevator according to this embodiment. [Figure 2] Figure 2(a) is a diagram that includes a partial enlarged view showing the overall configuration of the hoist included in Figure 1 as well as the internal configuration of the biasing unit in the braking mechanism, and Figure 2(b) is a diagram showing the configuration of the hoist in a plan view. [Figure 3] FIG. 3(a) is a cross-sectional view showing the internal configuration of the urging unit in a demagnetized state, and FIG. 3(b) is a cross-sectional view showing the internal configuration of the urging unit in a magnetized state. [Figure 4] Figure 4(a) is a diagram showing the mounting position of the tubular member with threaded holes relative to the adjustment bolt when not in use, Figure 4(b) is a diagram showing the position of the tubular member with threaded holes when in use, i.e., during maintenance and inspection, and Figure 4(c) is a partially enlarged view of the tubular member with threaded holes included in Figure 4(b). [Figure 5] FIG. 5(a) is a diagram showing the configuration of the tubular member with a threaded hole as seen from the side, and FIG. 5(b) is a diagram showing the configuration of the tubular member with a threaded hole as seen from the top (plane). [Figure 6] FIG. 6(a) is a plan view of the brake release lever, and FIG. 6(b) is a side view of the brake release lever. [Figure 7] FIG. 7 is a plan view showing the brake release lever attached to the hoist. DETAILED DESCRIPTION OF THE INVENTION

[0014] An elevator 10 according to one embodiment of the present invention will be described below with reference to the drawings. Note that the scales of the components in each drawing are not necessarily uniform. In each drawing, the horizontal direction perpendicular to the axial direction of the sheave 21 is indicated as horizontal direction X, the horizontal direction perpendicular to horizontal direction X is indicated as horizontal direction Y, and the vertical direction is indicated as vertical direction Z.

[0015] Fig. 1 is a schematic diagram showing the overall configuration of an elevator 10. As shown in Fig. 1, elevator 10 is a rope elevator that uses a traction system as its drive system, and a machine room 12 is provided directly above a hoistway 11. Elevator 10 is equipped with a hoist (elevator hoist) 20 and a deflector sheave 13 in machine room 12, and a main rope 14 is wound around a sheave 21 of the hoist 20 and the deflector sheave 13, with a car 15 hanging from one end of the main rope 14 and a counterweight 16 hanging from the other end.

[0016] FIG. 2(a) shows the front configuration of the hoisting machine 20 and includes a partially enlarged view showing the internal configuration of the biasing unit 52. FIG. 2(b) is a plan view showing the configuration of the hoisting machine 20. To avoid cumbersome illustrations, some components are omitted from FIGS. 2(a) and 2(b), and cross-sectional hatching is omitted. As shown in FIGS. 2(a) and 2(b), the hoisting machine 20 includes a sheave 21, a rotating body 22 attached coaxially with the sheave 21, and a pair of left and right braking mechanisms 30, 32 that apply a braking force to the rotating body 22. Because the braking mechanisms 30, 32 have the same configuration, the following description will mainly focus on the right braking mechanism 32, and will omit a description of the left braking mechanism 30 as appropriate. The braking mechanism 32 includes a movable unit 42 and a biasing unit 52 that biases the movable unit 42.

[0017] The movable unit 42 has a lining (sliding member) 43 that applies a braking force to the rotating body 22, a brake lever 44 that rotatably supports the lining 43, a compression spring (biasing member) 45 that biases the brake lever 44 in a direction approaching the rotating body 22, and an adjustment bolt 46 that abuts against a rod 53A of a biasing unit 52 (described later). The brake lever 44 is journaled at its lower end via a rotating shaft 44B, and is biased by the compression spring 45 attached to its upper part so as to rotate in a direction pressing the lining 43 against the rotating body 22. The rotating body 22 is attached to the rotating shaft of the sheave 21 arranged on the front side, and when a braking force acts on the rotating body 22, a braking force also acts on the sheave 21.

[0018] The adjustment bolt 46 is arranged to pass through the upper end 44A of the brake lever 44 in the horizontal direction X, and is fixed to the upper end 44A using a nut NT1 while being threaded into a screw hole provided in the upper end 44A.

[0019] The biasing unit 52 includes a plunger 53, which is a movable iron core to which a rod 53A that biases the adjustment bolt 46 described above is attached, and a main body (main body portion) 54 that houses the plunger 53. The main body 54 includes an electromagnetic portion 55 that is arranged to surround the periphery of the plunger 53, and a cover 56 that closes an end opening of the main body 54. An outer surface 56S of the cover 56 (see FIG. 4(b)) corresponds to the main body side reference surface of the present invention. A rod 53A is provided on the plunger 53. The rod 53A is arranged to protrude to the outside from a through hole 56H provided in the cover 56.

[0020] The electromagnetic unit 55 is composed of a coil or the like, and when energized, moves the plunger 53 toward the cover 56 via magnetic force. The cover 56 includes a ferromagnetic metal such as iron, and when the electromagnetic unit 55 is energized (excited), it attracts the plunger 53 via magnetic force. A compression spring 53C is interposed between the cover 56 and a washer 53B attached to the tip of the rod 53A. The biasing force of the compression spring 53C keeps the end face T (see FIG. 3(a)) of the rod 53A in contact with the adjustment bolt 46 of the movable unit 42.

[0021] The operation of the braking mechanism 32 will be described with further reference to FIGS. 3(a) and 3(b). FIG. 3(a) is a cross-sectional view showing the internal configuration of the biasing unit 52 in the braking mechanism 32 when the braking position P1 is reached, and FIG. 3(b) is a cross-sectional view showing the internal configuration of the biasing unit 52 when the braking position P2 is reached. In FIGS. 3(a) and 3(b), cross-sectional hatching has been omitted to avoid complication. As shown in FIG. 3(a), when the electromagnetic part 55 is de-energized, the biasing force of the adjustment bolt 46 of the movable unit 42 is greater than the elastic force of the compression spring 53C that biases the plunger 53 toward the cover 56. Therefore, the plunger 53 of the biasing unit 52 moves away from the cover 56 and is held in the braking position P1. At this time, a magnetic gap (gap) GP is formed between the cover 56 and the plunger 53.

[0022] 3(b), when the electromagnetic part 55 is in an energized (excited) state, the plunger 53 is attracted to the cover 56 by magnetic force against the biasing force of the adjustment bolt 46, and moves to a non-braking position P2 on the cover 56 side. Note that, because a buffer material (not shown) is disposed between the cover 56 and the plunger 53, the movement distance of the plunger 53 when the electromagnetic part 55 changes from a de-energized state to an energized state is slightly shorter than the magnetic gap GP described above. In this way, the adjustment bolt 46 is displaced outward via the plunger 53, in other words, in a direction away from the cover 56, and the movable unit 42 rotates in a direction away from the rotor 22, and the lining 43 moves away from the rotor 22, and no braking force acts on the rotor 22.

[0023] Here, the size of the magnetic gap GP formed when the electromagnetic part 55 is in a non-energized state must be a predetermined size in order for the plunger 53 to operate normally, but the size of the magnetic gap GP, which is the gap between the plunger 53 and the cover 56, cannot be measured directly.

[0024] Therefore, during maintenance and inspection, the length of the rod 53A protruding from the cover 56 when the electromagnetic part 55 is in a non-energized state is measured, and the length is compared with the length of the rod 53A protruding from the cover 56 when the electromagnetic part 55 is in a powered state, thereby confirming the size of the magnetic gap GP described above.

[0025] However, since the rod 53A is butted against the adjustment bolt 46 described above, it is difficult to measure the length from the end face T of the rod 53A to the cover 56 using a measuring tool such as a caliper, and measurement is time-consuming.

[0026] Therefore, in this embodiment, it is confirmed that the size of the magnetic gap GP is appropriate by measuring the length of the rod 53A protruding from the cover 56 using a cylindrical member 60 with a threaded hole attached to the adjustment bolt 46. The measurement method using the cylindrical member 60 with a threaded hole will be described below with reference to Figures 4(a) to 5(b).

[0027] Fig. 4(a) is a diagram showing the attachment position of the threaded tubular member 60 to the adjustment bolt 46 when not in use. As shown in Fig. 4(a), the threaded tubular member 60 is threadedly engaged with the adjustment bolt 46 in a state in which it can be displaced toward or away from the rod 53A. When not in use and maintenance or inspection is not being performed, this threaded tubular member 60 is attached to a retracted position adjacent to the upper end 44A of the brake lever 44, away from the rod 53A.

[0028] On the other hand, Figure 4(b) is a diagram showing the position of the threaded tubular member 60 during maintenance and inspection. Figure 4(c) is a partially enlarged view of the threaded tubular member 60 included in Figure 4(b). As shown in Figures 4(b) and 4(c), when performing maintenance and inspection work, the threaded tubular member 60 is displaced toward the cover 56 from the retracted position described above to a position where the bottom surface 62F of the cap portion 62 abuts or is close to the rod 53A, as will be described in detail later.

[0029] 5(a) is a diagram showing the configuration of the tubular member with a threaded hole as seen from the side, and FIG. 5(b) is a diagram showing the configuration of the tubular member with a threaded hole as seen from the top (in other words, as seen from a plane). As shown in FIG. 5(a) and FIG. 5(b), the tubular member with a threaded hole 60 has a cap portion 62 having a bottomed cylindrical shape on the left side, and a threaded hole 64 penetrating the axial center from a right end surface 60Q to a bottom surface 62F of the cap portion 62.

[0030] The inner space D of the cap part 62 is formed in a generally cylindrical shape large enough to insert the rod 53A, in other words, large enough to cover the rod 53A. The cap part 62 also has openings 62A and 62B on its side, which allow the inner space D of the cap part 62 to be seen from the outside.

[0031] However, if the end face T (see Figure 3(a)) of the rod 53A and the adjustment bolt 46 are separated by the biasing force of the bottom surface 62F in the internal space D of the cap portion 62, the protruding length of the rod 53A protruding from the cover 56 of the main body 54 cannot be accurately measured.

[0032] Therefore, as shown in FIG. 4(c), visually confirm whether the end face T (see FIG. 3(a)) of the rod 53A and the bottom face 62F are in slight contact (in other words, the bottom face 62F is in contact to the extent that the rod 53A is not pushed too far) through the openings 62A and 62B, or whether there is a very small gap between the end face T and the bottom face 62F. Here, a very small gap is, for example, a gap of 0.02 mm or less. The size of the very small gap may be confirmed by inserting a gap gauge through the openings 62A and 62B. Then, the distance L (see FIG. 4(b)) from the right end face 60R (measurement reference surface) of the tubular member 60 with the threaded hole, i.e., the right end face 60R of the tubular member 60 that is approximately parallel to the outer surface 56S of the cover 56 and located opposite the cover 56, to the outer surface 56S of the cover 56 is measured.

[0033] This makes it possible to confirm whether the plunger 53 moves to the non-braking position P2 when the electromagnetic part 55 changes from a non-energized state to an energized state, thereby preventing a braking force from acting on the rotating body 22 via the movable unit 42. If the distance L is not within a preset tolerance, the protruding length of the rod 53A is adjusted, for example, by adjusting the fixed position of the adjustment bolt 46 relative to the brake lever 44 of the movable unit 42.

[0034] According to the hoist 20 of this embodiment, the threaded tubular member 60 is displaced toward the cover 56 until the bottom surface 62F of the cap portion 62 abuts or is close to the rod 53A, and the distance L from the cover 56 to the threaded tubular member 60 is measured. Here, the length (thickness) TL (see FIG. 4(c)) of the threaded tubular member 60, which is included in the distance L, is a constant length, in other words, a fixed value. Therefore, the length of the rod 53A protruding from the cover 56 can be confirmed by subtracting the length corresponding to the fixed value. Here, the length TL corresponds to the distance between the right end surface 60R and the bottom surface 62F of the threaded tubular member 60. This reduces the effort required to measure the length of the rod 53A protruding from the cover 56. As a result, the effort required for maintenance and inspection can be reduced.

[0035] Next, a method for releasing the brake in the event of a power outage or the like in the hoisting machine 20 using the cylindrical member 60 with a threaded hole will be described. In the above-described hoisting machine 20, in the event of a power outage or the like, the electromagnetic part 55 is de-energized, so that a braking force acts on the rotating body 22 via the braking mechanisms 30, 32. In such a case, it is necessary for a maintenance person to manually temporarily release the braking state of the braking mechanisms 30, 32, thereby raising or lowering the car 15 to a predetermined landing.

[0036] Therefore, in this embodiment, the braked state of the brake mechanisms 30, 32 is released using the cylindrical member 60 with a threaded hole and brake release levers 70, 72, which will be described later.

[0037] Fig. 6(a) is a plan view of the brake release lever 72 described above, and Fig. 6(b) is a side view of the brake release lever 72. As shown in Figs. 6(a) and 6(b), the brake release lever 72 is a metal jig made up of a long, rod-shaped lever main body 74 and an insertion portion 76 attached to the tip of the lever main body 74. One end of the insertion portion 76 is welded to the lever main body 74, and the other end is bent and extends to form a claw portion 78. The claw portion 78 is a flat plate formed in a bifurcated shape so that it can clamp the rod 53A.

[0038] As shown in Fig. 7, a bulge 78A is provided on the back side of the insertion portion 76. This bulge 78A has a substantially semicircular shape in a side view and is provided linearly in the width direction. The bulge 78A functions as a fulcrum when the threaded tubular member 60 is moved toward the cover 56 and inserted into the gap SP (see Fig. 7) formed between the cover 56 and the threaded tubular member 60 so that the bulge 78A comes into contact with the cover 56, thereby urging the lever body 74 toward the center of the sheave 21.

[0039] Furthermore, it is preferable that the length of the gap SP be set to be slightly longer than the thickness of the claw portion 78 including the bulging portion 78A so that the claw portion 78 can be inserted. For this reason, it is preferable to rotate the threaded tubular member 60 relative to the adjustment bolt 46 to move it from the retracted position toward the cover 56, thereby adjusting the size of the gap SP in advance.

[0040] Furthermore, the distance α between the tip 78P of the claw 78, which functions as the point of application when biasing the threaded tubular member 60, and the bulge 78A is preferably set to a length such that the tip 78P is positioned further back than the axial center line CL of the adjustment bolt 46 when the claw 78 is inserted between the threaded tubular member 60 and the cover 56. More specifically, it is desirable to set the distance between the tip 78P and the axial center line CL to a length within 15% of the distance between the bulge 78A and the axial center line CL. This allows the biasing force of the brake release lever 70 to be smoothly transmitted to the adjustment bolt 46 via the threaded tubular member 60.

[0041] 7 is a plan view showing a state in which the brake release lever 72 is attached to the hoisting machine 20. As shown in Fig. 7, when the electromagnetic unit is in a non-energized state due to a power outage or the like, the threaded hole tubular member 60 is displaced from the retracted position in a direction approaching the cover 56. At this time, it is preferable to displace the threaded hole tubular member 60 toward the cover 56 to a position where the size of the gap SP between the threaded hole tubular member 60 and the cover 56 is slightly larger than the thickness of the claw portion 78 of the brake release lever 72.

[0042] Next, the brake release lever 72 is inserted into the gap SP and the lever main body 74 is urged in a direction approaching the center of the sheave 21, thereby urging the tubular member with threaded hole 60 toward the movable unit 42, i.e., in a direction away from the main body 54. This causes the brake lever 44 (see FIG. 2(a)) to rotate in a direction away from the rotating body 22 via the tubular member with threaded hole 60, and it becomes possible to put the rotating body 22 in a state where the braking force is not applied via the lining 43.

[0043] Using the same procedure as for the above-described braking mechanism 32, the braking state of the braking mechanism 30 on the opposite side is released simultaneously with the braking mechanism 32, for example, for a few seconds, using a braking release lever 70 having the same configuration as the braking release lever 72. This temporarily releases the braking state of the rotating body 22, allowing the car 15 to descend to the desired landing. In this way, by using the braking release levers 70, 72, the braking state of the braking mechanisms 30, 32 can be released by a single maintenance worker.

[0044] Furthermore, in this embodiment, the magnitude of the braking force acting on the rotating body 22 via the braking mechanisms 30, 32 is preferably set to a magnitude that allows the rotating body 22 to be stopped by the braking force of only one of the braking mechanisms 30, 32. In this case, during maintenance and inspection, the brake release lever 70 can be used to temporarily release the braking state of the braking mechanism 30 to inspect its operating state, and then the brake release lever 72 can be used to temporarily release the braking state of the braking mechanism 32 to perform the inspection. This allows the operating states of the braking mechanisms 30, 32 to be inspected individually while the rotating body 22 remains stopped. This improves the efficiency of maintenance and inspection work.

[0045] In this embodiment, an example is given in which the hoisting machine 20 is provided with two braking mechanisms 30, 32, but the present invention is not limited to this. For example, the hoisting machine 20 may be provided with only one braking mechanism. In this case, too, the same effects as those of the above embodiment can be obtained.

[0046] The present invention can be implemented in various forms, including improvements, modifications, and variations based on the knowledge of those skilled in the art, without departing from the spirit of the invention. Furthermore, the invention can be implemented in a form in which any of the features of the invention are replaced with other technology, as long as the same action or effect is achieved. [Explanation of symbols]

[0047] 10 Elevator 11 Elevator shaft 14 Main Rope 15 Car 20 Hoisting machine (hoisting machine for elevators) 30,32 Braking mechanism 40 Adjustment bolt 42 Mobile Unit 43 Lining (sliding member) 44 Brake lever 45 Compression spring (biasing member) 46 Adjustment bolt 52 energizing unit 53 Plunger 53A Rod 53B Washer 53C Compression spring 54 Main body (main body part) 55 Electromagnetic part 56 Cover 56S Outer surface (main body side reference surface) 60 Cylindrical member with threaded holes 60R Right end surface (measurement reference surface) 62 Cap part 62A,62B opening 62F bottom 70,72 Brake release lever SP Gap P1 Braking position P2 non-braking position X,Y horizontal direction Z vertical direction

Claims

1. a sheave on which the elevator main rope is stretched; a braking mechanism including: a movable unit including a sliding member that applies a braking force to the sheave and an urging member that urges the sliding member in a direction pressing the sheave; and an urging unit having a main body that stores a plunger provided with a rod that abuts against a bolt attached to the movable unit, and when the main body is in an energized state, the rod presses the bolt against the urging force of the urging member, thereby displacing the movable unit to a position where the braking force does not act; Equipped with The bolt is provided with a cylindrical member that is threadably engaged with the rod in a state in which the cylindrical member can be displaced toward or away from the rod, The cylindrical member is provided with an opening for visually checking the position of the rod. Elevator hoisting machine.

2. A sheave on which an elevator main rope is stretched; a braking mechanism including: a movable unit including a sliding member that applies a braking force to the sheave and an urging member that urges the sliding member in a direction pressing the sheave; and an urging unit having a main body that stores a plunger provided with a rod that abuts against a bolt attached to the movable unit, and when the main body is in an energized state, the rod presses the bolt against the urging force of the urging member, thereby displacing the movable unit to a position where the braking force does not act; Equipped with The bolt is provided with a cylindrical member that is threadably engaged with the rod in a state in which the cylindrical member can be displaced toward or away from the rod, the cylindrical member has a measurement reference surface that is substantially parallel to a main body reference surface provided on the main body portion when the cylindrical member is in contact with or close to the rod; Elevator hoisting machine.

3. A sheave on which an elevator main rope is stretched; a braking mechanism including: a movable unit including a sliding member that applies a braking force to the sheave and an urging member that urges the sliding member in a direction pressing the sheave; and an urging unit having a main body that stores a plunger provided with a rod that abuts against a bolt attached to the movable unit, and when the main body is in an energized state, the rod presses the bolt against the urging force of the urging member, thereby displacing the movable unit to a position where the braking force does not act; Equipped with The bolt is provided with a cylindrical member that is threadably engaged with the rod in a state in which the cylindrical member can be displaced toward or away from the rod, The cylindrical member is configured to be biased in a direction away from the main body by a brake release lever inserted between the cylindrical member and the main body, thereby displacing the bolt to a position where the braking force does not act. Elevator hoisting machine.

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