Hoist for elevator

Abstract

The invention provides a hoist for an elevator, which can reduce the labor of maintenance and inspection work. The elevator hoist (20) is provided with: a sheave (21) on which a main rope is erected; a brake mechanism (32) including: a movable unit (42) including a liner (43) for applying a braking force to the sheave (21); and a biasing unit (52) having a main body (54) that houses a plunger (53) provided with a rod section (53A), the rod section (53A) being in contact with an adjustment bolt (46) attached to the movable unit (42), and when the main body (54) is in a power-on state, the contact surface of the rod section (53A) pressing the adjustment bolt (46) against the biasing force of the compression spring (45), displacing the movable unit (42) to a position where the braking force does not act, and pressing the adjustment bolt (46) against the biasing force of the compression spring (45) when the main body (54) is in a power-on state. The adjustment bolt (46) is provided with a cylindrical member (60) with a threaded hole, and the cylindrical member (60) with the threaded hole is screwed with the adjustment bolt (46) in a state of being displaceable in a direction of approaching or separating from the rod part (53A).

Description

TECHNICAL FIELD

[0001] The present application relates to an elevator hoist provided in an elevator in which an elevator car is lifted by a main rope. BACKGROUND

[0002] The elevator hoist is provided with a sheave on which a main rope for lifting the elevator car is mounted, and a brake mechanism that applies a braking force to the sheave. The brake mechanism includes a movable unit that applies the braking force to the sheave using a sliding member, and a force applying unit that applies a force to the movable unit. The movable unit is always forced in a direction in which the braking force is applied to the sheave, and in the case where the braking force is released, the movable unit is forced in a direction opposite to the above-mentioned force by the force applying unit, thereby releasing the braking state of the sheave.

[0003] The force applying unit includes a plunger on which a rod portion is mounted, and a main body composed of a coil or the like, and the rod portion is arranged to protrude from the main body. When the main body is in an energized state, the plunger is moved by a magnetic force by a prescribed distance, and thus the rod portion applies a force to the movable unit, thereby becoming a state in which the braking force of the movable unit is not applied to the sheave. On the other hand, when the main body is in a non-energized state, the rod portion is pressed back by the force of the movable unit, and thus the plunger is pressed back by the prescribed distance, thereby becoming a state in which the braking force is applied to the sheave.

[0004] In Patent Literature 1, an elevator hoist is disclosed that is provided with a brake mechanism that is provided with an inner liner (sliding member) and a lever portion on which the inner liner is mounted, the inner liner is pressed against a rotating body by a force of a first force applying member via the lever portion, and the lever portion is moved in a direction in which the inner liner is separated from the rotating body using an actuator (main body) that includes a movable iron core (plunger).

[0005] PRIOR ART DOCUMENTS

[0006] PATENT LITERATURE

[0007] Patent Literature 1: Japanese Patent No. 6674666 SUMMARY

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] However, in order to confirm that the plunger is properly driven at the time of maintenance inspection or the like, it is necessary to measure the length of the rod portion that protrudes from the main body in the non-energized state. However, since the rod portion is always forced by the movable unit, there is a problem in that it is difficult to measure the length of the rod portion that protrudes from the main body, and the maintenance inspection work requires much effort.

[0010] An object of the present application is to provide an elevator hoist that can reduce the effort of maintenance inspection work.

[0011] Means for solving the problem

[0012] The elevator hoisting machine of the present application has: a sheave on which a main rope for an elevator is installed; a brake mechanism including a movable unit having a sliding member that applies a braking force to the sheave and a force applying member that applies a force in a direction in which the sliding member presses the sheave; and a force applying unit having a main body portion that houses a plunger having a rod portion that abuts against a bolt installed in the movable unit, wherein when the main body portion is in an energized state, the rod portion presses the bolt against the force of the force applying member, and the movable unit is displaced to a position at which the braking force does not act, and wherein a cylindrical member is provided on the bolt and is screwed to the bolt in a state in which it is displaceable in a direction in which it approaches or separates from the rod portion.

[0013] In the elevator hoisting machine of the present application, an opening portion for visually confirming the position of the rod portion can be provided on the cylindrical member.

[0014] In the elevator hoisting machine of the present application, the cylindrical member can be provided with a measurement reference surface that is parallel to a main body side reference surface provided on the main body portion when the cylindrical member abuts against or approaches the rod portion.

[0015] In the elevator hoisting machine of the present application, the cylindrical member can be configured to be displaced to the position at which the braking force does not act by a brake release lever inserted between the cylindrical member and the main body portion, which applies a force in a direction away from the main body.

[0016] Effects of the Invention

[0017] According to the elevator hoisting machine of the present application, the cylindrical member is screwed to the bolt in a state in which it is displaceable in a direction in which it approaches or separates from the rod portion. Therefore, the length from the main body portion to the cylindrical member can be measured in a state in which the cylindrical member abuts against or approaches the rod portion. Here, the length of the cylindrical member portion included in the length from the main body portion to the cylindrical member is a constant size. Therefore, by subtracting the length of the cylindrical member portion from the length from the main body portion to the cylindrical member, the length of the rod portion that protrudes from the main body portion can be confirmed. As a result, the effort required to measure the length of the rod portion that protrudes from the main body portion can be reduced. Consequently, the effort of the maintenance inspection work can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a diagram showing the overall structure of the hoisting machine included in

[0019] Figure 2 (a) in Figure 1 is a diagram showing the overall structure of the hoisting machine included in Figure 2(b) of FIG. 1 is a view showing the structure of the traction machine from a plan view angle.

[0020] Figure 3 (a) of FIG. 2 is a sectional view showing the structure inside the force applying unit in a demagnetized state, Figure 3 (b) of FIG. 2 is a sectional view showing the structure inside the force applying unit in a magnetized state.

[0021] Figure 4 (a) of FIG. 3 is a view showing the mounting position of the threaded hole cylindrical member with respect to the adjusting bolt in a non-use state, Figure 4 (b) of FIG. 3 is a view showing the position of the threaded hole cylindrical member in a use state, i.e., at the time of maintenance inspection, Figure 4 (c) of FIG. 3 is Figure 4 (b) of FIG. 3 is a partial enlarged view of the threaded hole cylindrical member included in (b) of FIG. 3.

[0022] Figure 5 (a) of FIG. 4 is a view showing the structure of the threaded hole cylindrical member from a side view angle, Figure 5 (b) of FIG. 4 is a view showing the structure of the threaded hole cylindrical member from a plan (flat) view angle.

[0023] Figure 6 (a) of FIG. 5 is a plan view of the brake release lever, Figure 6 (b) of FIG. 5 is a side view of the brake release lever.

[0024] Figure 7 is a plan view showing a state in which the brake release lever is mounted to the traction machine.

[0025] Symbol Explanation

[0026] 10: Elevator;

[0027] 11: Hoistway;

[0028] 14: Main rope;

[0029] 15: Elevator car;

[0030] 20: Traction machine (elevator traction machine);

[0031] 30, 32: Brake mechanism;

[0032] 40: Adjusting bolt;

[0033] 42: Movable unit;

[0034] 43: Inner liner (sliding member);

[0035] 44: Brake lever;

[0036] 45: Compression spring (force applying member);

[0037] 46: adjustment bolt

[0038] 52: force applying unit

[0039] 53: plunger

[0040] 53A: rod portion

[0041] 53B: washer

[0042] 53C: compression spring

[0043] 54: main body (main body portion)

[0044] 55: electromagnetic portion

[0045] 56: cover portion

[0046] 56S: outer side surface (main body side reference surface)

[0047] 60: threaded hole cylindrical member

[0048] 60R: right side end surface (measurement reference surface)

[0049] 62: cap portion

[0050] 62A, 62B: opening portion

[0051] 62F: bottom surface

[0052] 70, 72: brake release lever

[0053] SP: gap

[0054] P1: braking position

[0055] P2: non-braking position

[0056] X, Y: horizontal direction

[0057] Z: vertical direction DETAILED DESCRIPTION

[0058] Hereinafter, an elevator 10 according to one embodiment of the present application will be described with reference to the drawings. Note that the dimensions between the constituent elements are not necessarily uniform in each drawing. In each drawing, a horizontal direction orthogonal to the axial direction of a sheave 21 is denoted as a horizontal direction X, a horizontal direction orthogonal to the horizontal direction X is denoted as a horizontal direction Y, and a vertical direction is denoted as a vertical direction Z.

[0059] Figure 1 is a schematic view showing the overall structure of the elevator 10. As shown in the drawing, the elevator 10 includes a car 11, a counterweight 12, a hoisting machine 13, a rope 14, a sheave 21, a brake 20, a control panel 31, and a controller 32. Figure 1As shown, the elevator 10 is a rope type elevator of a traction type as a drive system, and a machine room 12 is provided right above a hoistway 11. The elevator 10 has a traction machine (elevator traction machine) 20 and a diverting pulley 13 in the machine room 12, and a main rope 14 is wound around a sheave 21 of the traction machine 20 and the diverting pulley 13, and an elevator car 15 is suspended at one end side of the main rope 14, and a counterweight 16 is suspended at the other end side of the main rope 14.

[0060] Figure 2 (a) of FIG. 1 is a structure view showing the front side of the traction machine 20, and partially includes a partial enlarged view showing the internal structure of the force applying unit 52. Figure 2 (b) of FIG. 1 is a plan view showing the structure of the traction machine 20. In Figure 2 (a) of FIG. 1 and Figure 2 (b) of FIG. 1, the illustration of a part of the structure is omitted for avoiding complicated illustration, and the cross-sectional hatching is omitted for the illustration. As shown in Figure 2 (a) of FIG. 1 and Figure 2 (b) of FIG. 1, the traction machine 20 has, in addition to the sheave 21, a rotating body 22 coaxially installed with the sheave 21, and a pair of brake mechanisms 30, 32 that apply a braking force to the rotating body 22. Here, since the brake mechanisms 30, 32 are the same structure, the right brake mechanism 32 will mainly be described in the following description, and the description of the left brake mechanism 30 will be appropriately omitted. The brake mechanism 32 includes a movable unit 42 and a force applying unit 52 that applies a force to the movable unit 42.

[0061] The movable unit 42 has an inner liner (sliding member) 43, a brake lever 44, a compression spring (force applying member) 45, and an adjusting bolt 46. The inner liner 43 applies a braking force to the rotating body 22. The brake lever 44 rotatably supports the inner liner 43. The compression spring 45 applies a force to the brake lever 44 in a direction approaching the rotating body 22. The adjusting bolt 46 abuts against a rod portion 53A of the force applying unit 52 described later. The lower end portion of the brake lever 44 is shaft supported by a rotating shaft 44B, and the brake lever 44 is installed to be rotated by the force of the compression spring 45 at the upper portion in a direction in which the inner liner 43 is pressed against the rotating body 22. The rotating body 22 is installed at the rotating shaft of the sheave 21 provided at the front side, and the braking force is applied to the rotating body 22, so that the braking force is also applied to the sheave 21.

[0062] The adjusting bolt 46 penetrates the upper end portion 44A of the brake lever 44 in the horizontal direction X, is fixed to the upper end portion 44A in a state of being screwed into the threaded hole provided at the upper end portion 44A, and is fixed to the upper end portion 44A using a nut NT1.

[0063] The force applying unit 52 includes a plunger 53 and a main body (main body portion) 54. The plunger 53 is a movable core, and a rod portion 53A that applies a force to the adjustment bolt 46 described above is installed. The main body 54 houses the plunger 53. The main body 54 includes a cover portion 56 that plugs an end portion opening of the electromagnetic portion 55 and the main body 54 that surrounds the periphery of the plunger 53. An outer side surface 56S (refer to Figure 4 (b)) corresponds to the main body side reference surface of the present application. The rod portion 53A is provided to the plunger 53. The rod portion 53A protrudes outward from a through hole 56H provided in the cover portion 56.

[0064] The electromagnetic portion 55 is configured by a coil or the like, and has a function of moving the plunger 53 to the cover portion 56 side by a magnetic force when energized. The cover portion 56 contains a ferromagnetic metal such as iron, and has a function of attracting the plunger 53 by a magnetic force when the electromagnetic portion 55 is in an energized (excited) state. Further, a compression spring 53C is installed between a grommet 53B installed to a tip portion of the rod portion 53A and the cover portion 56. By the force of this compression spring 53C, a state in which an end surface T (refer to Figure 3 (a)) of the rod portion 53A abuts against the adjustment bolt 46 of the movable unit 42 is maintained.

[0065] Further, the operation of the brake mechanism 32 will be described with reference to Figure 3 (a) and Figure 3 (b). (a) is a cross-sectional view showing the structure inside the force applying unit 52 in the braking position PI of the brake mechanism 32, Figure 3 (b) is a cross-sectional view showing the structure inside the force applying unit 52 in the non-braking position P2. In Figure 3 (a) and Figure 3 (b), a part of the cross-sectional hatching is omitted for the sake of avoiding complicated illustration. As shown in Figure 3 (a), in a case where the electromagnetic portion 55 is in a non-energized state, the plunger 53 of the force applying unit 52 moves in a direction away from the cover portion 56 and is held in the braking position PI due to the force of the adjustment bolt 46 of the movable unit 42 being greater than the elastic force of the compression spring 53C that applies a force to the plunger 53 toward the cover portion 56 side. At this time, a magnetic gap (gap) GP is formed between the cover portion 56 and the plunger 53. Figure 3

[0066] On the other hand, as shown in Figure 4 ​(b) of FIG. 6, in a case where the electromagnetic portion 55 is in the energized (excited) state, the plunger 53 is pulled by a magnetic force toward the cover portion 56 against the force of the adjusting bolt 46, and thus moves to the non-braking position P2 on the cover portion 56 side. In addition, since a cushion member, not shown, is provided between the cover portion 56 and the plunger 53, the moving distance of the plunger 53 when the electromagnetic portion 55 changes from the non-energized state to the energized state is slightly shorter than the magnetic gap GP described above. In this way, by displacing the adjusting bolt 46 outward, in other words, in a direction away from the cover portion 56, via the plunger 53, the movable unit 42 rotates in a direction away from the rotating body 22, and thus becomes a state in which the inner liner 43 is away from the rotating body 22 and the braking force is not applied to the rotating body 22.

[0067] Here, in order for the plunger 53 to normally operate, the size of the magnetic gap GP formed when the electromagnetic portion 55 is in the non-energized state needs to be a predetermined size, but the size of the magnetic gap GP, which is the gap between the plunger 53 and the cover portion 56, cannot be directly measured.

[0068] Therefore, at the time of maintenance inspection and the like, the following work is performed: the length of the rod portion 53A protruding from the cover portion 56 is measured when the electromagnetic portion 55 is in the non-energized state, and for example, by comparing the length of the rod portion 53A protruding from the cover portion 56 when in the energized state, the size of the magnetic gap GP is confirmed.

[0069] However, since the rod portion 53A abuts against the adjusting bolt 46 described above, it is difficult to measure the length from the end surface T of the rod portion 53A to the cover portion 56 using a measuring tool such as a vernier caliper, and there is a problem in that much effort is required for the measurement.

[0070] Therefore, in the present embodiment, by using the threaded hole cylindrical member 60 installed to the adjusting bolt 46, the length of the rod portion 53A protruding from the cover portion 56 is measured, and thus it is confirmed that the size of the magnetic gap GP is an appropriate size. Hereinafter, the measuring method using the threaded hole cylindrical member 60 will be described with reference to Figure 5 (a) to Figure 4 (b) of FIG. 6.

[0071] Figure 4 (a) of FIG. 6 is a view showing the installation position of the threaded hole cylindrical member 60 with respect to the adjusting bolt 46 when not in use. As shown in (a) of FIG. 6, the threaded hole cylindrical member 60 is screwed to the adjusting bolt 46 in a state in which it can be displaced in a direction approaching or separating from the rod portion 53A. Furthermore, the threaded hole cylindrical member 60 is installed at a position of avoidance, which is a position adjacent to the upper end portion 44A of the brake lever 44 away from the rod portion 53A when not in use (when maintenance inspection is not performed). Figure 4 On the other hand,

[0072] Figure 4 ​(b) in the figure shows the position of the threaded cylindrical member 60 during maintenance and inspection. Figure 4 (c) in the middle is Figure 4 A partial enlarged view of the threaded cylindrical member 60 included in (b) of the diagram. Figure 4 (b) and Figure 5 As shown in (c), during maintenance and inspection work, the threaded cylindrical member 60 is moved from the above-mentioned clearance position toward the cover 56 to the position where the bottom surface 62F of the cover 62 abuts or approaches the rod 53A as detailed later.

[0073] Here, Figure 5 (a) in the figure is a side view of the structure of the cylindrical member with threaded holes. Figure 5 (b) in the diagram represents the top view (in other words, the planar view) of the structure of a cylindrical component with a threaded hole. Figure 5 (a) and Figure 3 As shown in (b), the threaded cylindrical member 60 has a bottomed cylindrical cover 62 on the left side and a threaded hole 64 is provided through the center of the shaft from the right end face 60Q to the bottom surface 62F of the cover 62.

[0074] Furthermore, the inner space D of the cover 62 is sized to allow the rod 53A to be inserted; in other words, it is formed into a roughly cylindrical shape that covers the rod 53A. Additionally, openings 62A and 62B are provided on the sides of the cover 62. Thus, the inner space D of the cover 62 can be visually confirmed from the outside.

[0075] However, if the end face T of the rod 53A (refer to) Figure 4 If the adjusting bolt 46 and the inner space D of the cover 62 are separated due to the force of the bottom surface 62F, it is impossible to accurately measure the protruding length of the rod 53A from the cover 56 of the main body 54.

[0076] Therefore, as Figure 3 As shown in (c), the end face T of the rod portion 53A is visually confirmed through the openings 62A and 62B (refer to...). Figure 4 (a) of the end face T is in only slight contact with the bottom surface 62F (in other words, the bottom surface 62F is in contact with the rod portion 53A to the extent that it does not excessively press into it), or the end face T is so close to the bottom surface 62F that there is a very small gap. Here, a very small gap means, for example, a gap of 0.02 mm or less. Moreover, the size of the aforementioned very small gap can also be confirmed by inserting a gap gauge into the openings 62A and 62B. Then, the distance L from the right end face (measuring reference surface) 60R of the threaded cylindrical member 60 to the outer surface 56S of the cover portion 56 is measured (refer to...). Figure 4In (b)), the right end face 60R is the right end face 60 of the cylindrical member 60 that is substantially parallel to the outer surface 56S of the cover 56 and located on the opposite side of the cover 56.

[0077] Therefore, it can be confirmed whether the system is in a normal state, i.e., when the electromagnetic unit 55 changes from a non-energized state to an energized state, the plunger 53 moves to the non-braking position P2, so that the braking force no longer acts on the rotating body 22 via the movable unit 42. Furthermore, if the distance L is not within the preset allowable value, for example, the protruding length of the rod 53A can be adjusted by adjusting the fixed position of the adjusting bolt 46 relative to the brake lever 44 of the movable unit 42.

[0078] According to the traction machine 20 of this embodiment, the threaded cylindrical member 60 is moved towards the cover 56 to a position where the bottom surface 62F of the cover 62 abuts or approaches the rod 53A, and the distance L from the cover 56 to the threaded cylindrical member 60 is measured. Here, the length (thickness) TL of the threaded cylindrical member 60 included in the distance L (refer to...) Figure 6 In this context, (c) represents a constant length, or a fixed value. Therefore, by subtracting the length equivalent to this fixed value, the length of the rod portion 53A protruding from the cover portion 56 can be determined. Here, the length TL corresponds to the distance between the right end face 60R and the bottom face 62F of the threaded cylindrical member 60. This reduces the effort required to determine the length of the rod portion 53A protruding from the cover portion 56. Consequently, the time spent on maintenance and inspection can be reduced.

[0079] Next, the method for releasing the brakes of the traction machine 20, which uses a threaded cylindrical component 60, in situations such as power outages will be explained. In the traction machine 20 described above, since the electromagnetic unit 55 is not energized in situations such as power outages, the braking force is applied to the rotating body 22 via the braking mechanisms 30 and 32. In this case, it is necessary for maintenance personnel to manually and temporarily release the braking state of the braking mechanisms 30 and 32 to allow the elevator car 15 to rise or fall to the designated boarding position.

[0080] Therefore, in this embodiment, the braking state of the braking mechanisms 30 and 32 is released by using the threaded cylindrical member 60 and the brake release levers 70 and 72 described later.

[0081] Figure 6 (a) is a top view of the aforementioned brake release lever 72. Figure 6 (b) is a side view of the brake release lever 72. Figure 6 (a) and Figure 7The brake release lever 72 shown in (b) is a metal jig composed of a lever main body 74 in the shape of a long rod and an insertion portion 76 installed at the end portion of the lever main body 74. The insertion portion 76 is fixed by welding at the end portion side of the lever main body 74, and the other end side is bent and extended to form a claw portion 78. The claw portion 78 is a flat plate shaped in a bifurcated manner so as to sandwich the rod portion 53A.

[0082] As shown in Figure 7 , a bulge portion 78A is provided at the back side of the insertion portion 76. The bulge portion 78A is in the shape of a substantially semicircle in a side view, and is provided linearly in the width direction. In a state in which the threaded hole cylindrical member 60 is moved toward the cover portion 56, the bulge portion 78A is inserted into the gap SP (see Figure 7 ) formed between the cover portion 56 and the threaded hole cylindrical member 60 in a manner in which the bulge portion 78A is in contact with the cover portion 56, and a force is applied to the lever main body 74 in the direction toward the center of the sheave 21, the bulge portion 78A functions as a fulcrum.

[0083] Further, in order to be able to insert the claw portion 78, the length of the above-mentioned gap SP is preferably set to be slightly longer than the thickness of the claw portion 78 including the bulge portion 78A. Therefore, it is preferable to move the threaded hole cylindrical member 60 from the above-mentioned avoiding position toward the cover portion 56 by rotating the threaded hole cylindrical member 60 with respect to the adjusting bolt 46, thereby preliminarily adjusting the size of the gap SP.

[0084] Further, the distance a between the end portion 78P of the claw portion 78, which functions as a point of action, and the bulge portion 78A when a force is applied to the threaded hole cylindrical member 60 is preferably set to a length in which the end portion 78P is located on the inside of the axial center line CL of the adjusting bolt 46 when the claw portion 78 is inserted between the threaded hole cylindrical member 60 and the cover portion 56. More specifically, the distance between the end portion 78P and the axial center line CL is preferably set to a length within 15% of the distance between the bulge portion 78A and the axial center line CL. By this, the force of the brake release lever 70 can be smoothly transmitted to the adjusting bolt 46 by the threaded hole cylindrical member 60.

[0085] Figure 7 is a plan view showing a state in which the brake release lever 72 is installed in the hoisting machine 20. As shown in Figure 2 , in a case in which the electromagnetic portion is in a non-energized state due to a power failure or the like, the threaded hole cylindrical member 60 is displaced from the avoiding position toward the direction in which the cover portion 56 is approached. At this time, the threaded hole cylindrical member 60 is preferably displaced toward the cover portion 56 until the size of the gap SP between the threaded hole cylindrical member 60 and the cover portion 56 is slightly larger than the thickness of the claw portion 78 of the brake release lever 72.

[0086] Next, the brake release lever 72 is inserted into the gap SP, and the lever main body 74 is pressed in a direction toward the center of the rope pulley 21, thereby pressing the threaded hole cylindrical member 60 in a direction toward the movable unit 42, that is, away from the main body 54. Thus, the brake lever 44 (refer to ​ in (a)) is rotated in a direction away from the rotating body 22 by the threaded hole cylindrical member 60, thereby enabling the brake force to be applied to the rotating body 22 without passing through the inner liner 43.

[0087] In the opposite-side brake mechanism 30, the same structure as the brake release lever 72 is used, and the brake state is released simultaneously with the brake mechanism 32, for example, only for several seconds, in the same order as the above-described brake mechanism 32. Thus, the brake state of the rotating body 22 is temporarily released, and the elevator car 15 is lowered to a desired landing. In this way, the brake state of the brake mechanisms 30, 32 can be released by one maintenance person by using the brake release levers 70, 72.

[0088] Further, in the present embodiment, the magnitude of the brake force applied to the rotating body 22 by the brake mechanisms 30, 32 is preferably set to a magnitude at which the rotating body 22 can be stopped by the brake force of either of the brake mechanisms 30, 32. In this case, after the brake state of the brake mechanism 30 is temporarily released by using the brake release lever 70 and the working state is checked, the brake mechanism 30 is returned to the brake state, and then the brake state of the brake mechanism 32 is temporarily released by using the brake release lever 72, and the checking operation is performed. Thus, the working states of the brake mechanisms 30, 32 can be checked while the rotating body 22 is stopped. Thus, the operability of the maintenance checking operation can be improved.

[0089] In the present embodiment, an example in which the hoisting machine 20 is provided with two brake mechanisms 30, 32 is described, but is not limited thereto. For example, the hoisting machine 20 can be provided with only one brake mechanism. In this case, the same effects as the above-described embodiment can be obtained.

[0090] The present application can be implemented in various modifications, alterations, or changes within the scope of the gist thereof according to the knowledge of those skilled in the art. In addition, it can be implemented in a manner in which any technical feature is replaced with another technology within a range in which the same effects or effects are obtained.

Claims

1. A hoisting machine for an elevator, characterized in that Possessing: a rope wheel on which a main rope for an elevator is installed; a brake mechanism including: a movable unit having a sliding member that applies a braking force to the rope wheel, and a force applying member that applies a force in a direction in which the sliding member presses the rope wheel; a force applying unit having a main body portion in which a plunger provided with a rod portion that abuts against a bolt of the movable unit is housed, the rod portion pressing the bolt against an acting force of the force applying member to displace the movable unit to a position at which the braking force does not act when the main body portion is in an energized state; a cylindrical member provided on the bolt, the cylindrical member being screwed with the bolt in a state in which it is displaceable in a direction in which it approaches or separates from the rod portion.

2. The elevator hoist motor of claim 1, wherein an opening portion for visually confirming a position of the rod portion is provided on the cylindrical member.

3. The elevator hoist motor of claim 1, wherein the cylindrical member is provided with a measurement reference surface that is parallel with respect to a main body side reference surface provided on the main body portion when the cylindrical member abuts against or approaches the rod portion.

4. The elevator hoist motor of claim 1, wherein the cylindrical member is configured to be displaced to the position at which the braking force does not act by a lever for brake release that is interposed between the cylindrical member and the main body portion, applying a force in a direction in which it separates from the main body.

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