Hoist and elevator

Abstract

To provide a hoist capable of reducing a space necessary for forcibly opening a brake of the hoist.SOLUTION: This hoist comprises: a frame that stores a member to be braked; and a brake fitted to the frame. The brake includes a core to which a coil is fitted, an armature to which a brake shoe is fitted, and a spring for pressing the brake shoe to the member to be braked. In the core and the armature, a recessed groove to which a forcible opening instrument for pulling in the armature to the core side against a force of the spring can be attached is formed.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a hoist and an elevator.

Background Art

[0002] Generally, an elevator hoist is provided with an electromagnetic brake. The electromagnetic brake generates a braking force to stop the rotation of a driven member by pressing a brake shoe against the driven member with the force of a spring assembled to the brake. The electromagnetic brake also includes a core to which a coil is attached and an armature to which the brake shoe is attached, and releases the brake by pulling the armature toward the core side with the magnetic force generated by energizing the coil, thereby separating the brake shoe from the driven member.

[0003] By the way, when any failure or component wear occurs in the brake provided in the hoist, the entire brake or the brake components need to be replaced. Such brake replacement work is performed by forcibly releasing the brake. As a technique for forcibly releasing the brake, for example, the technique described in Patent Document 1 is known. Patent Document 1 discloses a technique for forcibly releasing a brake using a forced release bolt.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] As a configuration for forcibly releasing the brake, a through-hole is provided in the core of the brake, and a bolt for forced release (hereinafter also referred to as "release bolt") is inserted into this through-hole, and the male screw portion of the release bolt is engaged with the screw hole of the armature. In this configuration, by rotating the release bolt engaged with the screw hole of the armature in a predetermined direction, the armature can be drawn toward the core side against the force of the spring.

[0006] However, depending on the configuration of the elevator, it may be difficult to secure a space for inserting the release bolt into the through-hole of the core near the brake of the hoisting machine. For example, in a machine-roomless elevator, a rail is arranged near the brake of the hoisting machine, and there is a risk that the release bolt will interfere with the rail and the release bolt cannot be inserted into the through-hole of the core. In addition, in order to insert the release bolt into the through-hole of the core, it is necessary to secure sufficient space between the brake of the hoisting machine and the rail.

[0007] An object of the present invention is to provide a hoisting machine capable of reducing the space required for forcibly releasing the brake of the hoisting machine and an elevator including the same.

Means for Solving the Problems

[0008] To solve the above problems, for example, the configuration described in the claims is adopted. This application includes a plurality of means for solving the above problems. If one of them is mentioned, it is a hoisting machine including a frame for accommodating a driven member and a brake attached to the frame. The brake includes a core to which a coil is attached, an armature to which a brake shoe is attached, and a spring that presses the brake shoe against the driven member. Concave grooves are formed in the core and the armature so that a forced release device for drawing the armature toward the core side against the force of the spring can be mounted.

Effects of the Invention

[0009] According to the present invention, it is possible to reduce the space required to forcibly release the brake of the hoist. Problems, configurations, and effects other than those described above will be clarified by the description of the following embodiments.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Best Mode for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this specification and the drawings, elements having substantially the same function or configuration are denoted by the same reference numerals, and redundant descriptions are omitted as appropriate. Also, the following description and drawings are examples for explaining the present invention, and may be omitted and simplified for convenience of explanation. Each component may be in a single or plural number unless otherwise particularly limited. Also, the positions, sizes, shapes, ranges, etc. of the components shown in the drawings may not represent the actual positions, sizes, shapes, ranges, etc. in order to facilitate understanding of the invention. For this reason, the present invention is not necessarily limited to the positions, sizes, shapes, ranges, etc. disclosed in the drawings.

[0012] FIG. 1 is a schematic view showing an arrangement example of a hoist of an elevator according to the present embodiment. As shown in FIG. 1, the hoist 10 includes a frame 11, a sheave 12, and two brakes 15. The frame 11 constitutes the main body portion of the hoist 10. A driven member (not shown) is accommodated in the frame 11. A pair of legs 16 are provided at the lower part of the frame 11. The hoist 10 is installed in the hoistway by fixing the legs 16 of the frame 11 to, for example, a machine beam (not shown) with bolts or the like. An elevator with the hoist 10 installed in the hoistway is a so-called machine-roomless elevator that does not have a machine room above the hoistway.

[0013] The hoist 10 generates a driving force for rotating the sheave 12 by driving a drive motor (not shown). A main rope (not shown) is wound around the sheave 12. Then, the hoist 10 raises and lowers a car (not shown) in the hoistway by the movement of the main rope accompanying the rotation of the sheave 12.

[0014] The two brakes 15 are arranged in pairs on the left and right of the frame 11 when viewed from the central axis direction of the sheave 12 (the depth direction of the paper surface in FIG. 1). Specifically, each brake 15 is attached to the side surface portion of the frame 11. Each brake 15 stops the rotation of the sheave 12 by applying a braking force to a braking member arranged within the frame 11. In the present embodiment, it is assumed that the braking member is a drum (brake drum).

[0015] In a machine roomless elevator, a rail 17 may be arranged near the brake 15 of the hoisting machine 10. Note that the configuration of the brake will be described separately for a comparative form and an embodiment. The comparative form and the embodiment differ in the configuration of the brake provided in the hoisting machine 10. For this reason, in the following description, the common portions of the hoisting machine 10 are given the same reference numerals except for the components of the brake.

[0016] <Comparative Form> FIG. 2 is a schematic diagram for explaining a configuration example of a brake provided in a hoisting machine according to a comparative form. As shown in FIG. 2, the brake 54 of the hoisting machine is an electromagnetic brake including a core 56 to which a coil 55 is attached, an armature 58 to which a brake shoe 57 is attached, and a spring (not shown) that presses the brake shoe 57 against the drum 14. The drum 14 is housed in the frame 11 of the hoisting machine 10.

[0017] The coil 55 and the armature 58 are attached to the frame 11 using a plurality of bolts 65. When viewed from the A direction in FIG. 2, both the coil 55 and the armature 58 are formed in a rectangular shape. Bolt insertion holes (not shown) are formed at the four corners of the coil 55 and the four corners of the armature 58, and the male screw portion 65a of the bolt 65 is inserted into these bolt insertion holes. Further, the inner diameter of the bolt insertion hole is set to be larger than the outer diameter of the male screw portion 65a of the bolt 65. For this reason, the coil 55 and the armature 58 are movable in the axial direction of the bolt 65.

[0018] The spring described above biases the coil 55 and the armature 58 away from each other. However, the coil 55 is in contact with the head of the bolt 65. Therefore, the biasing force of the spring is applied in a direction that presses the brake shoe 57 against the drum 14 via the armature 58.

[0019] The brake shoe 57 is attached to the armature 58 using a plurality of shoe mounting bolts 67. The armature 58 is provided with a threaded hole (female thread) that meshes with the male threaded portion of the shoe mounting bolt 67. The brake shoe 57 is attached to the armature 58 by meshing the male threaded portion of the shoe mounting bolt 67 with the threaded hole of the armature 58 and tightening the shoe mounting bolt 67.

[0020] When replacing the brake 54 having the above configuration, it is necessary to manually and forcibly release the brake 54 before loosening the bolt 65. In the brake 54 according to the comparative form, an opening bolt 68 is used as a forced release device. As viewed from the A direction in FIG. 2, a through hole 69 for passing the male threaded portion 68a of the opening bolt 68 is provided in the central portion of the core 56. The inner diameter of the through hole 69 is larger than the outer diameter of the male threaded portion 68a of the opening bolt 68. Further, as viewed from the A direction in FIG. 2, a threaded hole 70 is provided in the central portion of the armature 58.

[0021] When actually forcibly releasing the brake 54, the operator first inserts the male screw portion 68a of the release bolt 68 into the through hole 69 of the core 56 from the A direction in FIG. 2. Next, the operator meshes the male screw portion 68a of the release bolt 68 with the screw hole 70 of the armature 58 by rotating the head of the release bolt 68 by hand. Next, the operator further rotates the release bolt 68 using a tool such as a wrench. Then, a force is generated between the core 56 and the armature 58 to pull the armature 58 toward the core 56 against the force (biasing force) of the spring described above. Therefore, by rotating the release bolt 68 with a tool such as a wrench, the brake shoe 57 can be pulled toward the core 56 together with the armature 58, and the brake 54 can be forcibly released. In the state where the brake 54 is forcibly released in this way, the brake shoe 57 is separated from the drum 14.

[0022] In a comparative form, for example, as shown in FIG. 3, when the rail 17 is arranged near the brake 54, the male screw portion 68a of the release bolt 68 cannot be inserted into the through hole 69 of the core 56 due to the interference between the rail 17 and the release bolt 68. Further, in order to insert the male screw portion 68a of the release bolt 68 into the through hole 69 of the core 56, it is necessary to secure a wide space between the rail 17 and the core 56 that is longer than the length of the release bolt 68.

[0023] <First Embodiment> FIG. 4 is a schematic perspective view showing a configuration example of a brake provided in a hoist according to the first embodiment. Further, FIG. 5 is a schematic diagram for explaining a configuration example of a brake provided in a hoist according to the first embodiment. As shown in FIGS. 4 and 5, the brake 15 of the hoist 10 is an electromagnetic brake including a core 23 to which a coil 22 is attached, an armature 25 to which a brake shoe 24 is attached, and a spring 26 (see FIG. 6) that presses the brake shoe 24 against the drum 14. When the coil 22 is energized, the brake 15 generates a magnetic attraction force between the core 23 and the armature 25, and by pulling the armature 25 toward the core 23 with this magnetic attraction force, the brake 15 is released. Also, when the energization of the coil 22 is cut off, the brake 15 presses the brake shoe 24 against the drum 14 by the biasing force of the spring 26 to apply a braking force to the drum 14.

[0024] The core 23 and the armature 25 constitute the main body portion of the brake 15 (hereinafter also referred to as the "brake main body portion"). The core 23 and the armature 25 are attached to the frame 11 using a plurality (four in the illustrated example) of bolts 30. When looking at the brake 15 from the B direction in FIG. 4, both the core 23 and the armature 25 are formed in a rectangular shape. When looking from the B direction in FIG. 4, the outer dimensions (length and width dimensions) of the core 23 and the outer dimensions of the armature 25 are substantially the same. However, the outer dimensions of the core 23 may be different from the outer diameter dimensions of the armature 25. Bolt insertion holes (not shown) are formed at the four corners of the core 23 and the four corners of the armature 25, and the male screw portion 30a of the bolt 30 is inserted into these bolt insertion holes. Also, the inner diameter of the bolt insertion hole is set larger than the outer diameter of the 30a of the bolt 30. For this reason, the core 23 and the armature 25 are movable in the axial direction of the bolt 65.

[0025] As shown in FIG. 6, the spring 26 is housed in the spring housing portion 27 of the core 23. The spring housing portion 27 can be formed in the core 23 by, for example, drilling. The spring housing portion 27 is formed on the surface of the core 23 that faces the armature 25. A plurality of spring housing portions 27 are formed in the core 23, and one spring 26 is housed in each spring housing portion 27. A compression coil spring can be used for the spring 26. One end of the spring 26 contacts the end on the inner side of the spring housing portion 27, and the other end of the spring 26 contacts the armature 25. Thereby, the core 23 is biased in the left direction in FIG. 5 by the force of the spring 26. And the core 23 is abutted against the head of the bolt 30 by the biasing force of the spring 26. On the other hand, the armature 25 is biased in the right direction in FIG. 5 by the force of the spring 26. The brake shoe 24 is pressed against the drum 14 by the biasing force of the spring 26 applied to the armature 25.

[0026] The brake shoe 24 is attached to the armature 25 using a plurality of shoe mounting bolts 31. In the present embodiment, as an example, the brake shoe 24 is configured to be attached to the main surface 38 of the armature 25 using four shoe mounting bolts 31 (see FIG. 7). The main surface 38 of the armature 25 is a surface that is disposed in a state of facing the side surface of the frame 11. As shown in FIG. 5, the brake shoe 24 has a protruding portion 24a and a pair of upper and lower bolt mounting portions 24b. A lining 24c is fixed to the protruding portion 24a. A hole (not shown) for passing the male screw portion of the shoe mounting bolt 31 is formed in the bolt mounting portion 24b. The lining 24c is a portion that contacts the drum 14 when the brake shoe 24 is pressed against the drum 14 by the biasing force of the spring 26.

[0027] The amateur 25 is provided with a threaded hole (female thread) that meshes with the male threaded portion of the shoe mounting bolt 31. The brake shoe 24 is attached to the amateur 25 by engaging the male threaded portion of the shoe mounting bolt 31 with the threaded hole of the amateur 25 and tightening the shoe mounting bolt 31. Further, the frame 11 is formed with a fitting portion 11a (see FIG. 5) into which the brake shoe 24 can be fitted. The fitting portion 11a is constituted by an opening into which the protruding portion 24a of the brake shoe 24 can be inserted. The brake shoe 24 is configured to be held by the frame 11 without falling off from the frame 11 even when the brake shoe 24 is alone, by fitting the protruding portion 24a of the brake shoe 24 into the fitting portion 11a of the frame 11.

[0028] FIG. 7 is a view of the brake 15 before mounting the forced release device 32, as seen from the drum 14 side. FIG. 8 is a view of the brake 15 after mounting the forced release device 32, as seen from the drum 14 side. In this specification, when the brake 15 is viewed from the direction of B in FIG. 4, among the four surfaces that form the outer shape (outline) of the core 23, the upper surface of the core 23 is denoted by reference numeral 23a and the lower surface of the core 23 is denoted by reference numeral 23b for explanation. Also, in this specification, when the brake 15 is viewed from the direction of B in FIG. 4, among the four surfaces that form the outer shape (outline) of the amateur 25, the upper surface of the amateur 25 is denoted by reference numeral 25a and the lower surface of the amateur 25 is denoted by reference numeral 25b for explanation. The direction of B in FIG. 4 is a direction parallel to the thickness direction of the brake 15 and the axial direction of the bolt 30.

[0029] As can be seen from FIGS. 4, 5, and 7, U-shaped concave grooves 28 are respectively formed on the upper surface 23a and the lower surface 23b of the core 23, and correspondingly, inverted U-shaped concave grooves 29 are respectively formed on the upper surface 25a and the lower surface 25b of the amateur 25.

[0030] In FIG. 4, the X direction indicates the width direction of the core 23 and the width direction of the armature 25, and the Y direction indicates the thickness direction of the core 23 and the thickness direction of the armature 25. The concave groove 28 is formed at the middle position in the width direction of the upper surface 23a of the core 23 and the middle position in the width direction of the lower surface 23b of the core 23. Further, the concave groove 29 is formed at the middle position in the width direction of the upper surface 25a of the armature 25 and the middle position in the width direction of the lower surface 25b of the armature 25.

[0031] The concave groove 28 formed on the upper surface 23a of the core 23 and the concave groove 29 formed on the upper surface 25a of the armature 25 are formed on the same straight line parallel to the thickness direction (the left-right direction in FIG. 5) of the brake 15. Similarly, the concave groove 28 formed on the lower surface 23b of the core 23 and the concave groove 29 formed on the lower surface 25b of the armature 25 are formed on the same straight line parallel to the thickness direction of the brake 15. Further, the concave groove 28 is formed in a state of penetrating the core 23 in the thickness direction Y, and the concave groove 29 is formed in a state of penetrating the armature 25 in the thickness direction Y.

[0032] As shown in FIG. 7, the width dimension W and the depth dimension D of the concave groove 29 on the upper surface 25a and the lower surface 25b of the armature 25 are set according to the dimensions of a forced release device described later. This also applies to the width dimension and the depth dimension of the concave groove 28 on the upper surface 23a and the lower surface 23b of the core 23.

[0033] When manually and forcibly releasing the brake 15 in order to replace the brake 15, an operator attaches a forced release device 32 to the core 23 and the armature 25 that constitute the brake body portion, as shown in FIG. 5. In that case, the operator attaches two forced release devices 32 to the brake 15 by using the concave groove 28 formed on the upper surface 23a and the lower surface 23b of the core 23 and the concave groove 29 formed on the upper surface 25a and the lower surface 25b of the armature 25. The forced release device 32 is a device used to forcibly release the brake 15. Therefore, after the replacement work of the brake 15 is completed, the forced release device 32 is removed from the brake 15.

[0034] The forced release device 32 is composed of a release bolt 33 and a nut 34. The nut 34 meshes with the male screw portion 33a of the release bolt 33 at the end opposite to the head of the release bolt 33. The width dimension and depth dimension of the above-described concave grooves 28 and 29 are set to be larger than the outer diameter of the male screw portion 33a of the release bolt 33. For this reason, the male screw portion 33a of the release bolt 33 can be fitted into the concave groove 28 of the core 23 and the concave groove 29 of the armature 25 from the upper side and the lower side of the brake 15.

[0035] Specifically, when attaching the forced release device 32 to the concave groove 28 formed on the upper surface 23a of the core 23 and the concave groove 29 formed on the upper surface 25a of the armature 25, as shown by the arrow E in FIG. 9, the male screw portion 33a of the release bolt 33 is fitted into the concave grooves 28 and 29 from the upper side of the brake 15. Further, when attaching the forced release device 32 to the concave groove 28 formed on the lower surface 23b of the core 23 and the concave groove 29 formed on the lower surface 25b of the armature 25, as shown by the arrow F in FIG. 9, the male screw portion 33a of the release bolt 33 is fitted into the concave grooves 28 and 29 from the lower side of the brake 15.

[0036] Here, both the direction indicated by the arrow E in FIG. 9 and the direction indicated by the arrow F in FIG. 9 correspond to directions orthogonal to the moving direction of the armature 25. The moving direction of the armature 25 is the direction in which the armature 25 approaches or separates from the side surface of the frame 11 (the left - right direction in FIG. 9). Also, the direction in which the armature 25 moves is also the direction in which the armature 25 moves along the male screw portion 30a of the bolt 30. The direction orthogonal to the moving direction of the armature 25 is the direction approaching the brake 15 from the outside (side) of the brake 15 when looking at the brake 15 from the B direction in FIG. 4. Further, when attaching the forced release device 32 to the core 23 and the armature 25 from a direction orthogonal to the moving direction of the armature 25, the attaching direction of the forced release device 32 changes depending on which part of the core 23 and the armature 25 the concave grooves 28 and 29 are formed in. For this reason, the direction indicated by the arrow E in FIG. 9 and the direction indicated by the arrow F in FIG. 9 are only examples of directions orthogonal to the moving direction of the armature 25.

[0037] When actually manually and forcibly releasing the brake 15, the operator prepares two forced release tools 32 (release bolts 33, nuts 34). For one forced release tool 32, after the operator appropriately adjusts the distance from the head of the release bolt 33 to the nut 34, the male threaded portion 33a of the release bolt 33 is fitted into the concave groove 28 of the core 23 and the concave groove 29 of the armature 25 from the direction indicated by the arrow E in FIG. 9. At this time, the nut 34 is inserted between the armature 25 and the frame 11. For this reason, at the upper part of the brake 15, the core 23 and the armature 25 are sandwiched between the head of the release bolt 33 and the nut 34. Next, the operator manually tightens the nut 34. Thereby, the forced release tool 32 is attached to the upper part of the brake 15.

[0038] For the other forced release tool 32, after the operator appropriately adjusts the distance from the head of the release bolt 33 to the nut 34, the male threaded portion 33a of the release bolt 33 is fitted into the concave groove 28 of the core 23 and the concave groove 29 of the armature 25 from the direction indicated by the arrow F in FIG. 9. At this time, the nut 34 is inserted between the armature 25 and the frame 11. For this reason, at the lower part of the brake 15, the core 23 and the armature 25 are sandwiched between the head of the release bolt 33 and the nut 34. Next, the operator manually tightens the nut 34. At this time, the force with which the operator manually tightens the nut 34 may be a force such that the forced release tool 32 attached to the lower part of the brake 15 does not fall off.

[0039] Thereby, as shown in FIG. 10, one forced release tool 32 (release bolt 33, nut 34) is attached to each of the upper and lower parts of the brake 15. Note that the order of attaching the forced release tool 32 may be either the upper part or the lower part of the brake 15 first.

[0040] After that, for example, the operator stops the rotation of the head of the release bolt 33 with a tool such as a wrench (not shown), and in this state, rotates the nut 34 in a predetermined direction with a tool such as a wrench. The predetermined direction is the direction in which the distance from the head of the release bolt 33 to the nut 34 becomes smaller when the nut 34 is rotated with a tool such as a wrench. Therefore, when the nut 34 is rotated in the predetermined direction, a force is generated between the core 23 and the armature 25 to pull the armature 25 toward the core 23 against the force (biasing force) of the spring 26. As a result, the armature 25 is pulled toward the core 23. In the present embodiment, two forced release devices 32 are attached to the brake 15. Therefore, the operator appropriately adjusts the rotation amounts of the upper and lower nuts 34 so that the pulling-in amounts of the armature 25 are substantially the same with the two forced release devices 32. By the above operations, the lining 24c of the brake shoe 24 attached to the armature 25 is separated from the drum 14, that is, the brake 15 is in a state of being forcibly released.

[0041] In the present embodiment, an example is given in which the nut 34 is rotated in a predetermined direction with the head of the release bolt 33 stopped from rotating, but the present invention is not limited to this, and the head of the release bolt 33 may be rotated in a predetermined direction with the nut 34 stopped from rotating.

[0042] When removing the brake 15 from the frame 11 thereafter, the operator loosens the four bolts 30 to such an extent that the male screw portions 30a of the respective bolts 30 do not interfere with the frame 11. At this time, the armature 25 is pulled toward the core 23 by the forced release device 32. Further, the core 23 is pressed against the head of the release bolt 33 by the biasing force of the spring 26, and the armature 25 is pressed against the nut 34 by the biasing force of the spring 26. Therefore, even when the plurality of bolts 30 are loosened as described above, there is no possibility that the core 23 pops out in the left direction in FIG. 5 due to the biasing force of the spring 26. Therefore, the operator can safely perform the removal work of the brake 15.

[0043] Furthermore, before loosening the four bolts 30 as described above, the worker loosens the shoe mounting bolts 31 to release the engagement between the male threads of the shoe mounting bolts 31 and the threaded holes of the armature 25. This allows the brake main body, including the core 23 and armature 25, to be removed from the frame 11 together with the forced release tool 32, while the brake shoe 24 remains held on the frame 11.

[0044] Specifically, the worker pulls the brake main body, including the core 23 and armature 25, toward the front in Figure 5 while the forced release tool 32 is still attached to it. Then, the movement of the brake shoe 24 is restricted by the fitting portion 11a of the frame 11. Therefore, the worker can remove the brake main body from the frame 11 while keeping the protruding portion 24a of the brake shoe 24 fitted in the fitting portion 11a of the frame 11.

[0045] Furthermore, after removing the brake main body portion from the frame 11, the worker can remove the brake shoe 24 from the frame 11 by pulling the brake shoe 24 out of the fitting portion 11a of the frame 11. Therefore, when replacing the brake 15, the worker can replace not only the entire brake 15, but also the brake main body portion or the brake shoe 24. In other words, the worker can replace all or some of the parts of the brake 15.

[0046] As described above, in the brake 15 provided in the hoist 10 according to the first embodiment, concave grooves 28 are respectively formed on the upper surface 23a and the lower surface 23b of the core 23, and concave grooves 29 are also respectively formed on the upper surface 25a and the lower surface 25b of the armature 25. And the brake 15 is configured such that a forced release device 32 can be attached to the core 23 and the armature 25 from the directions indicated by the arrow E and the arrow F in FIG. 9. Thereby, for example, as shown in FIG. 5, even when the rail 17 is arranged near the brake 15 of the hoist 10, the forced release device 32 can be attached to the brake 15 without interfering with the rail 17. Specifically, if a space is secured between the rail 17 and the core 23 such that the head of the release bolt 33 can be inserted, the forced release device 32 can be attached to the brake 15. For this reason, compared with the brake 54 according to the comparative form, the space required for forcibly releasing the brake 15 can be reduced.

[0047] <Second Embodiment> FIG. 11 is a schematic perspective view showing a configuration example of a brake provided in a hoist according to the second embodiment. FIG. 12 is a schematic diagram for explaining a configuration example of a brake provided in a hoist according to the second embodiment. FIG. 13 is a view of the brake 15 with the forced release device 32 attached as viewed from the drum 14 side.

[0048] As shown in FIGS. 11 to 13, the brake 15A provided in the hoist according to the second embodiment is mainly different in the configuration of the armature 25 as compared with the brake 15 provided in the hoist according to the above-described first embodiment. Specifically, a guide groove 37 for attaching a shoe is formed in the armature 25. The guide groove 37 is a groove in which the brake shoe 24 can move in the left-right direction in FIG. 13. The left-right direction in FIG. 13 corresponds to the width direction of the armature 25. The guide groove 37 is formed in a state where a part of the main surface 38 of the armature 25 is recessed.

[0049] The height dimension H of the guide groove 37 (see FIG. 13) is set to be slightly smaller than the height dimension of the brake shoe 24 in order to allow the brake shoe 24 to move in the width direction of the armature 25. Further, a positioning reference portion 37a (see FIG. 13) is provided in the guide groove 37. The positioning reference portion 37a is a portion for determining the relative position between the brake shoe 24 and the armature 25 in the width direction of the armature 25. The positioning reference portion 37a is formed on one end side of the guide groove 37 in the width direction of the armature 25. Further, in the width direction of the armature 25, an end portion 37b (see FIGS. 11 and 13) of the guide groove 37 located on the side opposite to the positioning reference portion 37a is open. Thereby, the guide groove 37 is a groove capable of receiving the brake shoe 24 from the width direction of the armature 25. Further, by abutting the brake shoe 24 received in the guide groove 37 against the positioning reference portion 37a, the brake shoe 24 and the armature 25 are positioned.

[0050] Further, a space S is formed between the bolt mounting portion 24b of the brake shoe 24 and the frame 11 for loosening the shoe mounting bolt 31 by a predetermined amount. The space S only needs to be a space sufficient to release the meshing state between the male screw portion of the shoe mounting bolt 31 and the screw hole of the armature 25 meshing therewith by loosening the shoe mounting bolt 31 by a predetermined amount. Further, the space S may be a space sufficient to remove the loosened shoe mounting bolt 31, for example, by reducing the thickness of the bolt mounting portion 24b of the brake shoe 24.

[0051] Thereby, for example, when each of the shoe mounting bolts 31 is loosened to release the meshing state between the male screw portion of the shoe mounting bolt 31 and the screw hole of the armature 25, the protruding portion 24a of the brake shoe 24 is fitted into the fitting portion 11a of the frame 11, and the brake body portion (core 23, armature 25) can be removed from the frame 11 together with the forced release device 32.

[0052] Specifically, with the forced release device 32 attached to the brake main body portion, the operator pulls the brake main body portion in the forward direction of FIG. 12. Then, the movement of the brake shoe 24 is restricted by the fitting portion 11a of the frame 11. Therefore, the operator can remove the brake main body portion from the frame 11 while keeping the protruding portion 24a of the brake shoe 24 fitted to the fitting portion 11a of the frame 11. In other words, the brake main body portion can be removed from the frame 11 with the brake shoe 24 inserted into the frame 11.

[0053] Also, after the operator removes the brake main body portion from the frame 11, the brake shoe 24 can be removed from the frame 11 by pulling the brake shoe 24 out of the fitting portion 11a of the frame 11. Therefore, when the operator replaces the brake 15, in addition to replacing the entire brake 15, the operator can also handle the case of replacing the brake main body portion or the case of replacing the brake shoe 24. That is, the operator can replace all or part of the parts of the brake 15.

[0054] Also, after the operator replaces all or part of the parts of the brake 15, it is necessary to reinstall the replaced parts of the brake 15. In that case, after fitting the protruding portion 24a of the brake shoe 24 to the fitting portion 11a of the frame 11, the operator can mutually attach the brake main body portion and the brake shoe 24 along the guide groove 37 by fitting the brake shoe 24 into the guide groove 37 of the armature 25. Also, the operator can position the brake shoe 24 and the armature 25 by abutting the brake shoe 24 against the positioning reference portion 37a of the guide groove 37. When attaching the brake main body portion to the frame 11, the forced release device 32 is attached to the brake main body portion in advance, and the forced release device 32 is removed from the brake main body portion after the attachment of the brake main body portion is completed. [[ID=IO]]

[0055] <Modification example, etc.> The present invention is not limited to the above-described embodiments and includes various modifications. For example, in the above-described embodiments, the present invention has been described in detail for easy understanding of the content of the present invention, but the present invention is not necessarily limited to having all the configurations described in the above-described embodiments. Also, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment. Further, it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Also, for a part of the configuration of each embodiment, it is possible to delete it, add another configuration, or replace it with another configuration.

[0056] For example, in each of the above embodiments, as shown in FIG. 14, an example in which concave grooves 28 and 29 are formed at the widthwise intermediate positions P1 and P2 on the upper and lower surfaces of the core 23 and the armature 25 has been shown, but the present invention is not limited thereto. For example, as shown in FIG. 14, concave grooves 28 and 29 may be formed at the heightwise intermediate positions P3 and P4 on both side surfaces of the core 23 and the armature 25, or concave grooves 28 and 29 may be formed at the diagonal positions (P5, P6, or P7, P8) of the core 23 and the armature 25. By forming the concave grooves 28 and 29 at such positions, when two forced release devices 32 are attached to the brake 15 to forcibly release the brake 15, the inclination of the armature 25 can be suppressed and the armature 25 can be drawn toward the core 23 side. However, the positions where the concave grooves 28 and 29 are formed are not limited to specific positions as long as the brake 15 can be forcibly released.

[0057] Also, when concave grooves 28 and 29 are formed at the intermediate positions P1 and P2 in the width direction on the upper and lower surfaces of the core 23 and the armature 25 as in each of the above embodiments, the forced release device 32 is to be attached to the core 23 and the armature 25 from the upper side and the lower side as indicated by the arrows in FIG. 14. In this case, when attaching the forced release device 32 to the core 23 and the armature 25, the vertical direction in FIG. 14 corresponds to the direction orthogonal to the moving direction of the armature 25. Also, when concave grooves 28 and 29 are formed at the intermediate positions P3 and P4 in the height direction on both side surfaces of the core 23 and the armature 25, the forced release device 32 is to be attached to the core 23 and the armature 25 from the left side and the right side as indicated by the arrows in FIG. 14. In this case, when attaching the forced release device 32 to the core 23 and the armature 25, the left - right direction in FIG. 14 corresponds to the direction orthogonal to the moving direction of the armature 25. This is the same for the case where concave grooves 28 and 29 are formed at the diagonal positions (P5, P6, or P7, P8) of the core 23 and the armature 25. Thus, when attaching the forced release device 32 to the core 23 and the armature 25 from the direction orthogonal to the moving direction of the armature 25, the direction of attaching the forced release device 32 changes depending on which part of the core 23 and the armature 25 the concave grooves 28 and 29 are formed in. Note that the direction orthogonal to the moving direction of the armature 25 is not limited to the vertical direction or the horizontal direction, and may be an oblique direction depending on the direction in which the concave grooves 28 and 29 are formed. In any case, it remains the same that the forced release device 32 is attached to the core 23 and the armature 25 from the direction orthogonal to the moving direction of the armature 25.

[0058] Also, in each of the above embodiments, an example in which two forced release devices 32 are attached to one brake 15 is shown, but the number of forced release devices 32 attached to one brake 15 may be three or more.

[0059] Also, in FIGS. 1 and 5, an example in which a rail 17 is arranged near the brake 15 is shown, but the structure arranged near the brake 15 is not limited to the rail 17.

[0060] In the above embodiment, the elevator without a machine room has been described as an example. However, the present invention may also be applied to an elevator in which a hoisting machine is installed in a machine room.

Explanation of Signs

[0061] 10... Hoisting machine, 11... Frame, 15... Brake, 14... Drum (member to be braked), 15... Brake, 22... Coil, 23... Core, 24... Brake shoe, 24b... Bolt attachment part, 25... Amateur, 26... Spring, 28, 29... Groove, 31... Bolt for attaching shoe, 32... Forced release device, 33... Release bolt, 34... Nut, 37... Guide groove, 37a... Positioning reference part, S... Space

Claims

1. A hoisting machine comprising a frame for accommodating a member to be braked and a brake attached to the frame, wherein the brake includes a core to which a coil is attached, an armature to which a brake shoe is attached, and a spring for pressing the brake shoe against the member to be braked, and concave grooves are formed in the core and the armature so that a forced release device for pulling the armature toward the core against the force of the spring can be attached thereto. Hoisting machine.

2. The core and the armature are each formed in a rectangular shape when viewed from the moving direction of the armature, and the concave grooves are formed at intermediate positions in the width direction of the upper and lower surfaces of the core and the armature, at intermediate positions in the height direction of both side surfaces of the core and the armature, or at diagonal positions of the core and the armature. The hoisting machine according to Claim 1.

3. A guide groove capable of receiving the brake shoe from the width direction of the armature is formed in the armature. The hoisting machine according to Claim 1.

4. The guide groove is provided with a positioning reference portion for determining the relative position between the brake shoe and the armature in the width direction of the armature. The hoisting machine according to Claim 3.

5. The brake shoe is attached to the armature by a shoe mounting bolt, and a space for loosening the shoe mounting bolt by a predetermined amount is formed between the bolt mounting portion of the brake shoe and the frame. The hoisting machine according to Claim 1.

6. The concave grooves are formed so that the forced release device can be attached to the core and the armature from a direction orthogonal to the moving direction of the armature. The hoisting machine according to Claim 1.

7. An elevator comprising a hoisting machine for generating a driving force for raising and lowering a car, wherein the hoisting machine includes a frame for accommodating a member to be braked and a brake attached to the frame, the brake includes a core to which a coil is attached, an armature to which a brake shoe is attached, and a spring for pressing the brake shoe against the member to be braked, and concave grooves are formed in the core and the armature so that a forced release device for pulling the armature toward the core against the force of the spring can be attached thereto. Elevator.

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