Elevator brake device

Abstract

To provide a brake system for an elevating machine capable of suppressing the peeling of a lining due to a brake load even if a multiply divided lining is used.SOLUTION: A brake system for an elevating machine comprises: a drum connected to a hoist of an elevating machine; a lining applying a braking force to the drum by contacting with an outer peripheral surface of the drum; and a shoe to which the lining is attached. The lining is divided into multiple parts in a circumferential direction of the drum, the shoe has multiple concave grooves formed at intervals in the circumferential direction of the drum on a facing surface facing the outer peripheral surface of the drum, and the lining is attached to the shoe in a state of being engaged in the concave groove.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a brake device for an elevator. [Background technology]

[0002] Lifts such as elevators and escalators are equipped with brake devices that brake the lifting machine. One type of elevator brake device is a lever-type brake device. A lever-type brake device is a type of drum-type brake device that brakes the drum using the leverage of a lever. A lever-type brake device includes a drum connected to the elevator's lifting machine, a lining that contacts the outer surface of the drum to apply a braking force to the drum, and a shoe to which the lining is attached.

[0003] Traditionally, lever-type brake devices have used soft linings, but some manufacturers have discontinued production of soft linings due to environmental considerations in the manufacturing process.On the other hand, disc-type brake devices and direct-acting brake devices use hard linings that are resistant to surface pressure and highly durable.

[0004] One possible solution is to change the lining used in lever-type brake devices from soft to hard linings. However, if the hard lining has the same shape as the soft lining, the hard lining may not be able to withstand the deformation caused by braking and may crack.

[0005] Patent Document 1 describes a technology for linings used in lever-type brake devices, in which a sintered metal lining (lining material) divided into multiple pieces is attached at intervals to a base having the same area as a conventional lining. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 10-110751 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the technique described in Patent Document 1, the surface of the base metal to which the lining is attached is smooth, and therefore the following problems may occur. For example, if a lining is pressed against a rotating drum during an emergency stop of an elevator, frictional force is generated at the contact interface between the drum and lining, and this frictional force causes the lining to receive a load in the direction of the drum rotation (hereinafter also referred to as "braking load"). The braking load is applied as a shear load to the lining's adhesive surface. For this reason, if the surface of the base is smooth, the lining will be more likely to peel off when subjected to the braking load.

[0008] An object of the present invention is to provide a brake device for an elevator that can suppress peeling of the lining due to braking load even when a lining divided into multiple pieces is used. [Means for solving the problem]

[0009] In order to solve the above problems, for example, the configurations described in the claims are adopted. The present application includes multiple means for solving the above-mentioned problems, and one such means is a brake device for an elevator comprising a drum connected to the hoist of the elevator, a lining that contacts the outer peripheral surface of the drum to apply a braking force to the drum, and a shoe to which the lining is attached, wherein the lining is divided into multiple parts in the circumferential direction of the drum, and the shoe has multiple grooves formed at intervals in the circumferential direction of the drum on an opposing surface that faces the outer peripheral surface of the drum, and the lining is attached to the shoe in a state where it is fitted into the grooves. [Effects of the Invention]

[0010] According to the present invention, even when a lining divided into a plurality of pieces is used, peeling of the lining due to braking load can be suppressed. Problems, configurations, and effects other than those described above will become apparent from the following description of the embodiments. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a front view of an elevator brake device according to a first embodiment. FIG. [Figure 2] 3 is a view showing a state in which a lining is attached to a shoe in the elevator brake device according to the first embodiment. FIG. [Figure 3] FIG. 3 is a view of the shoe and lining as seen from the left in FIG. 2. [Figure 4] 3 is a diagram illustrating the lining mounting structure at the P portion in FIG. 2. FIG. [Figure 5] FIG. 10 is a view showing a state in which a lining is attached to a shoe in the elevator brake device according to the second embodiment. [Figure 6] FIG. 4 is an enlarged view of the lining attachment state as viewed from the width direction of the shoe. [Figure 7] FIG. 7 is a cross-sectional view of FIG. 6 taken along line B-B. [Figure 8] 10A and 10B are diagrams illustrating the structure of a shoe and a lining provided in an elevator brake device according to a third embodiment. [Figure 9] FIG. 10 is an enlarged view showing a state in which a lining is attached to a shoe in the elevator brake device according to the third embodiment. [Figure 10] FIG. 10 is an enlarged view of the attached state of the lining in the elevator brake device according to the fourth embodiment, viewed from the width direction of the shoe. [Figure 11] 11 is a cross-sectional view taken along CC in FIG. 10. [Figure 12] 10A and 10B are diagrams illustrating a method for attaching a lining in the fourth embodiment. [Figure 13] FIG. 11 is a view showing a state in which a lining is attached to a shoe in the elevator brake device according to the fifth embodiment. [Figure 14]FIG. 14 is a view of the shoe and lining as seen from the left in FIG. 13. [Figure 15] FIG. 10 is a diagram (part 1) for explaining a modified example. [Figure 16] FIG. 10 is a diagram (part 2) for explaining a modified example. [Figure 17] FIG. 10 is a diagram illustrating another modified example. DETAILED DESCRIPTION OF THE INVENTION

[0012] 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 functions or configurations are designated by the same reference numerals, and redundant description will be omitted.

[0013] First Embodiment FIG. 1 is a front view of an elevator brake device according to a first embodiment. 1, elevator brake device 10 is a lever-type brake device that includes a drum 11 connected to an elevator hoist (not shown), a pair of levers 12 arranged on either side of drum 11, springs 13 that bias pair of levers 12, an electromagnetic force generating unit 14 that generates electromagnetic force, a lining 15 that contacts outer peripheral surface 11a of drum 11 to apply braking force to drum 11, a shoe 16 to which lining 15 is attached, and a base 18 that supports fulcrum 17 of lever 12. Elevator brake device 10 is used in elevators such as elevators and escalators.

[0014] The drum 11 is a metal member that rotates together with the output shaft of the hoist. The lever 12 is supported so as to be rotatable about a fulcrum 17. The end 12a of the lever 12 is biased by a spring 13. The spring 13 biases the pair of levers 12 in a braking direction. The braking direction here refers to the direction in which the lining 15 is pressed against the outer peripheral surface 11a of the drum 11 via the shoe 16. Note that in FIG. 1, the pair of levers 12 are biased from both sides by two springs 13, but it is also possible to bias the pair of levers in the braking direction by a single spring (not shown).

[0015] Although not shown, the electromagnetic force generating unit 14 includes, for example, an electromagnetic coil, a fixed iron core, and a movable iron core, and when current flows through the electromagnetic coil by energizing it generates an electromagnetic force that overcomes the biasing force of the spring 13. The pair of levers 12 are displaced in the direction opposite to the braking direction, i.e., in the direction to release the brake, by the electromagnetic force generated by the electromagnetic force generating unit 14. Furthermore, when the power supply to the electromagnetic force generating unit 14 is cut off and current no longer flows through the electromagnetic coil, the pair of levers 12 are displaced in the braking direction by the biasing force of the spring 13. In other words, the elevator brake device 10 is designed so that the brake is released only when the electromagnetic force generating unit 14 is in a powered state.

[0016] The shoes 16 are arranged in pairs on both sides of the drum 11, similar to the lever 12 described above. The shoes 16 are made of metal, such as cast iron, and are formed in an arc shape so as to fit along the outer circumferential surface 11a of the drum 11. The shoes 16 are attached to the lever 12 with screws 19.

[0017] The lining 15 is made of a hard lining. Hard linings have a higher allowable surface pressure than soft linings. Hard linings and soft linings differ in the materials they are made of and the processing methods they are made of. Specifically, hard linings are made by blending inorganic fibers, organic fibers, specially formulated thermosetting synthetic resins, and fillers, and then pressurizing and heating this mixture to form a hard molded lining into a specified size. In contrast, soft linings are soft (semi-hard) belt-shaped linings made by impregnating a fabric made from a woven mixture of special glass containing metal fibers with a special synthetic resin binder, and then drying, heating, and pressing the fabric to a specified size.

[0018] The lining 15 is divided into multiple pieces in the circumferential direction of the drum 11 (the R direction in FIG. 1 ). By using the lining 15 divided into multiple pieces in this manner, cracking of the lining 15 can be suppressed even when the lining 15 is made of a hard lining. In this embodiment, as an example, the lining 15 is divided into three pieces in the circumferential direction of the drum 11, and these three linings 15 are attached to one shoe 16.

[0019] Fig. 2 is a diagram showing a state in which a lining is attached to a shoe in the elevator brake device according to the first embodiment. Fig. 3 is a diagram showing the shoe and lining as viewed from the left in Fig. 2, and Fig. 4 is a diagram explaining the lining attachment structure at part P in Fig. 2. In addition, in Figure 1, the pair of shoes 16 are arranged symmetrically on both sides of the drum 11, but since their basic structure is the same, only one shoe 16 and the lining 15 attached to it will be explained here.

[0020] As shown in Figures 2 to 4, the shoe 16 has a plurality of grooves 22 on its facing surface 20 that faces the outer peripheral surface 11a of the drum 11. The facing surface 20 of the shoe 16 is formed in a concave shape along the outer peripheral surface 11a of the drum 11. The grooves 22 are formed by recessing a portion of the facing surface 20 of the shoe 16. In this embodiment, three grooves 22 are formed on the facing surface 20 of the lever 12, corresponding to the number of divisions of the lining 15 (three in this embodiment).

[0021] The three grooves 22 are formed at intervals in the circumferential direction of the drum 11 (direction R in FIG. 1). A lining 15 is fitted into each groove 22. The grooves 22 are formed in the shape of a long strip in the width direction X (FIG. 3) of the shoe 16. The width direction X of the shoe 16 is a direction parallel to the central axis of the drum 11. The grooves 22 are formed across the entire width of the shoe 16, and the lining 15 is fitted into the grooves 22 across the entire width of the shoe 16. In other words, the length of the grooves 22 and the length of the lining 15 in the X direction in FIG. 3 are approximately the same as the width of the shoe 16.

[0022] As shown in FIG. 4, the depth Ld of the groove 22 is set smaller than the thickness Lt of the lining 15. The width direction Lw1 of the groove 22 is set slightly larger than the width Lw2 of the lining 15. The difference between the width direction Lw1 of the groove 22 and the width Lw2 of the lining 15 is, for example, approximately 0.1 mm to 1.0 mm at room temperature. This provides a gap corresponding to the above-mentioned dimensional difference (Lw1-Lw2) at the fitting portion between the lining 15 and the groove 22. When attaching the lining 15 to the shoe 16, the lining 15 can be fitted into the groove 22 from the left-right direction (direction indicated by the arrow) in FIG. 4. The groove 22 is formed across the entire width of the shoe 16. Therefore, when attaching the lining 15 to the shoe 16, the lining 15 can also be fitted into the groove 22 by inserting the lining 15 into the groove 22 from the width direction X of the shoe 16.

[0023] In the elevator brake device 10 according to the first embodiment, when the electromagnetic force generating unit 14 is switched from a conducting state to a non-conducting state, the pair of levers 12 are displaced in the braking direction by the biasing force of the spring 13. As a result, each lining 15 is pressed against the outer peripheral surface 11a of the drum 11. When the lining 15 is pressed against the rotating drum 11, a frictional force is generated at the contact interface between the drum 11 and the lining 15, and this frictional force applies a load in the drum rotation direction, i.e., a braking load, to the lining 15.

[0024] Here, as described above, the lining 15 is attached to the shoe 16 while being fitted into the recessed groove 22. Therefore, when a braking load is applied to the lining 15 by being pressed against the drum 11, this braking load can be received by the fitting portion (hooking portion) between the lining 15 and the recessed groove 22. Therefore, peeling of the lining 15 due to the braking load can be suppressed.

[0025] Furthermore, the lining 15 is configured to be insertable into the groove 22 from the width direction X of the shoe 16. Therefore, when the wear of the lining 15 exceeds a predetermined amount and the lining 15 needs to be replaced, the lining can be replaced without disassembling the elevator brake device 10. Specifically, for example, the brake is released by pushing the end 12a of the lever 12 in the spring compression direction with a tool or the like against the biasing force of the spring 13, and in this state the lining 15 before replacement is pulled out of the groove 22, and then a new lining 15 is inserted into the groove 22, thereby replacing the lining 15. This reduces the time and maintenance costs required for maintenance work on the elevator brake device 10, including lining replacement.

[0026] Second Embodiment Fig. 5 is a view showing a state in which a lining is attached to a shoe in an elevator brake device according to a second embodiment, Fig. 6 is an enlarged view of the attached state of the lining as seen from the width direction of the shoe (direction A in Fig. 5), and Fig. 7 is a cross-sectional view taken along line B-B in Fig. 6. The elevator brake device according to the second embodiment differs from the first embodiment in the lining mounting structure.

[0027] As shown in Figures 5 to 7, the lining 15 is fitted into a groove 22 formed in a shoe 16, as in the first embodiment described above. Two holders 24 are attached to each shoe 16 for each lining 15. The holders 24 are members that suppress displacement of the lining 15 in the length direction of the groove 22 (the X direction in Figure 5). The holders 24 are attached to both ends of the groove 22 in the length direction so as to sandwich the lining 15 from both sides in the X direction in Figure 5.

[0028] The holder 24 is attached to the shoe 16 by a hexagonal bolt 25. More specifically, a threaded hole is formed in the bottom surface of the groove 22 of the shoe 16 corresponding to the attachment position of the holder 24, and a through-hole is formed in the holder 24 through which the male threads of the hexagonal bolt 25 pass. The holder 24 is fixed to the shoe 16 by passing the hexagonal bolt 25 through the through-hole of the holder 24, engaging it with the threaded hole of the groove 22, and then tightening the hexagonal bolt 25 in this state. In this embodiment, the holder 24 is fixed using the hexagonal bolt 25 as an example, but the fixing means is not limited to the hexagonal bolt 25 and can be variously modified.

[0029] The length of the lining 15 in the X direction in FIG. 5 is set shorter than the length of the groove 22, thereby ensuring space for attaching a holder at both longitudinal ends of the groove 22. As shown in FIG. 7, the lining 15 has a stepped structure having a protrusion 151. The lining 15 also has thin-walled portions 152 at both longitudinal ends of the lining 15. The protrusion 151 of the lining 15 is disposed so as to protrude toward the drum 11 beyond the opposing surface 20 of the shoe 16. Therefore, when the electromagnetic force generating unit 14 is in a non-energized state, the protrusion 151 of the lining 15 is pressed against the outer peripheral surface 11a of the drum 11.

[0030] The holder 24 is made of, for example, a bent metal plate such as a plated steel plate. The holder 24 integrally includes a fixed portion 241, a rising portion 242, and a pressing portion 243. The fixed portion 241 is fixed to the bottom surface of the groove 22 with a hexagonal bolt 25. The rising portion 242 rises vertically from the bottom surface of the groove 22 so as to form a right angle with the fixed portion 241. The rising portion 242 also connects the fixed portion 241 and the pressing portion 243. The rising portion 242 is arranged in contact with or close to an end surface 153 ( FIG. 7 ) of the lining 15 in the longitudinal direction to prevent the lining 15 from shifting in the longitudinal direction of the groove 22. The pressing portion 243 is arranged parallel to the bottom surface of the groove 22 so as to form a right angle with the rising portion 242. The pressing portion 243 is disposed so as to overlap the thin portion 152 of the lining 15 , and in this state presses the lining 15 against the bottom surface of the recessed groove 22 .

[0031] In the elevator brake device according to the second embodiment, in addition to the same effects as in the first embodiment described above, the following effects can be obtained. The elevator brake device according to the second embodiment is equipped with a holder 24 that suppresses displacement of the lining 15 in the length direction of the groove 22. Therefore, the holder 24 suppresses displacement of the lining 15 caused by repeated activation and release of the brake, thereby maintaining stable braking performance. In addition, since there is no need to fix the lining 15 to the shoe 16 with screws or the like, there is no need to drill holes in the lining 15.

[0032] The holder 24 also has a pressing portion 243 that presses the lining 15 against the bottom surface of the recessed groove 22. This makes it possible to suppress rattling of the lining 15 caused by the difference (Lw1-Lw2) between the width direction Lw1 of the recessed groove 22 and the width dimension Lw2 of the lining 15, as described in the first embodiment with reference to Fig. 4 .

[0033] <Third embodiment> FIG. 8 is a diagram illustrating the structure of the shoe and lining provided in the elevator brake device according to the third embodiment, and FIG. 9 is an enlarged view showing the state in which the lining is attached to the shoe in the elevator brake device according to the third embodiment. As shown in Figures 8 and 9, the shoe 16A has a plurality of grooves 22A. The lining 15A is fitted into the grooves 22A of the shoe 16A. The grooves 22A of the shoe 16A are formed in a dovetail shape. The lining 15A is formed in a trapezoid shape that corresponds to the dovetail shape of the grooves 22A. An appropriate gap G (Figure 9) is provided at the fitting portion between the grooves 22A and the lining 15A. The presence of this gap G allows the lining 15A to be inserted into the grooves 22A in the width direction of the shoe 16A (the direction perpendicular to the plane of the paper in Figure 9).

[0034] As shown in FIG. 9 , the gap G is a gap secured on both sides of the lining 15A when the lining 15A is pressed against the bottom surface of the groove 22A. The gap G is approximately 0.1 mm to 1.0 mm at room temperature. Providing such a gap G can prevent stress from being generated at the mating portion between the lining 15A and the groove 22A due to thermal expansion of the lining 15A, for example, when the lining 15A thermally expands due to contact with the rotating drum 11, thereby preventing cracking of the lining 15A and the shoe 16A. Meanwhile, because the lining 15A is replaced when it is not thermally expanded, the presence of the gap G allows the lining 15A to be replaced without disassembling the elevator brake device. This effect can also be achieved in the first and second embodiments by providing a gap (approximately 0.1 mm to 1.0 mm at room temperature) at the mating portion between the lining 15 and the groove 22. The gap is equal to the difference between the width direction Lw1 of the groove 22 and the width dimension Lw2 of the lining 15.

[0035] In the third embodiment, the position of the lining 15A in the normal direction (left-right direction in FIG. 9) of the opposing surface 20A of the shoe 16A is restricted by the engagement between the dovetail-shaped recessed groove 22A and the trapezoidal lining 15A. Therefore, peeling of the lining 15A due to the braking load can be more effectively suppressed compared to the first embodiment.

[0036] In the third embodiment, as shown in FIG. 9, the entire lining 15A is formed in a trapezoidal shape, but this is not limited to this, and only a portion of the lining 15A that fits into the dovetail-shaped recessed groove 22A may be formed in a trapezoidal shape.

[0037] <Fourth embodiment> FIG. 10 is an enlarged view of the elevator brake device according to the fourth embodiment, showing the state in which the lining is attached, as viewed from the width direction of the shoe, and FIG. 11 is a cross-sectional view taken along CC in FIG. The elevator brake device according to the fourth embodiment is similar to the third embodiment in that the groove 22A of the shoe 16A is dovetail-shaped and the lining 15A is trapezoidal to correspond to this dovetail shape. However, the fourth embodiment differs from the third embodiment in that a holder 24 is attached to the shoe 16A and the lining 15A has a stepped structure to accommodate the attachment of this holder 24.

[0038] The holder 24 has the same structure as in the second embodiment (FIGS. 6 and 7). The lining 15A has a protruding portion 151A, a thin portion 152A, and an end surface 153A. The fixing portion 241 of the holder 24 is fixed to the bottom surface of the recessed groove 22A by a hexagonal bolt 25. The rising portion 242 of the holder 24 is disposed in contact with or in close proximity to the end surface 153A of the lining 15A. The pressing portion 243 of the holder 24 is disposed on top of the thin portion 152A of the lining 15A, and in this state presses the lining 15A against the bottom surface of the recessed groove 22A.

[0039] In the fourth embodiment, when attaching the lining 15A to the shoe 16A, as shown in Fig. 12, the lining 15A is fitted into the groove 22A by inserting the lining 15A into the groove 22A from a direction parallel to the width direction X of the shoe 16. At this time, the insertion amount of the lining 15A is adjusted so that the screw hole 26 formed in the bottom surface of the groove 22A is not hidden by the lining 15A. Next, as shown in Figs. 10 and 11, the holder 24 is attached to the shoe 16A with a hexagon bolt 25.

[0040] The elevator brake device according to the fourth embodiment can achieve the same effects as those of the second and third embodiments. Furthermore, when the holder 24 is attached as described above, the surface 243a of the pressing portion 243 of the holder 24 comes into contact with the outer peripheral surface 11a of the drum 11 when the wear amount of the lining 15A reaches a predetermined amount t (FIG. 11). In this case, if the surface 243a of the pressing portion 243, which corresponds to the contact surface, is colored with paint or other coating material, when the surface 243a of the pressing portion 243 comes into contact with the outer peripheral surface 11a of the drum 11, the color transfers from the surface 243a of the pressing portion 243 to the outer peripheral surface 11a of the drum 11 at the contact point, thereby changing the color of the outer peripheral surface 11a of the drum 11.

[0041] As a result, during periodic inspection of the elevator brake device, it is possible to determine whether the amount of wear of the lining 15A has reached a predetermined amount t by checking whether the color of the outer peripheral surface 11a of the drum 11 has changed. This effect can also be obtained when the surface of the pressing portion 243 of the holder 24 in the second embodiment described above is colored. Note that only the surface 243a of the pressing portion 243 of the holder 24 may be colored, or the entire surface of the holder 24, including the surface 243a of the pressing portion 243, may be colored. When the entire surface of the holder 24 is colored by painting or the like, the bent metal plate constituting the holder 24 does not need to be plated.

[0042] Fifth Embodiment Fig. 13 is a view showing a state in which a lining is attached to a shoe in an elevator brake device according to a fifth embodiment, and Fig. 14 is a view of the shoe and lining viewed from the left in Fig. 13. The elevator brake device according to the fifth embodiment is similar to the third embodiment in that the recessed groove 22A of the shoe 16A is dovetail-shaped and the lining 15A is trapezoidal to correspond to this dovetail shape. However, the fourth embodiment differs from the third embodiment in that a holder 24B is attached to the shoe 16A.

[0043] As shown in FIG. 14, the holder 24B is formed in a flat plate shape and is attached to the end face of the shoe 16A in the width direction X with screws 27. As shown in FIG. 13, the holder 24B is formed in an arc shape so as to overlap each of the three divided linings 15A. This allows the common holder 24B to suppress misalignment of each lining 15A in the length direction of the groove 22A (the X direction in FIG. 14). This reduces the number of parts and the number of assembly steps compared to when misalignment of each lining 15A is suppressed by individual holders 24 (see, for example, FIGS. 5 to 7, 10, and 11). The holder 24B is attached to the end face of the shoe 16A so as to sandwich the lining 15A in the width direction X of the shoe 16A. This facilitates the installation of the holder 24B.

[0044] In the fifth embodiment, the position of each lining 15A in the longitudinal direction of the groove 22A is held down by a common holder 24B, but as a modified example, as shown in Figures 15 and 16, a configuration may be adopted in which a holder 24C having a pressing portion 243C is attached to the end face of the shoe 16A with a screw 27. In this configuration, the pressing portion 243C of the holder 24C is disposed so as to overlap the thin-walled portion 152A of each lining 15A, and in this state, each lining 15A is pressed against the bottom surface of the groove 22A.

[0045] As another modification, as shown in FIG. 17, a configuration may be adopted in which a holder 24D having a pressing portion 243D is attached to the opposing surface 20A of the shoe 16A with a screw 28. As in the fourth embodiment, the lining 15A has a protrusion 151A and a thin-walled portion 152A (FIGS. 10 and 11). The pressing portion 243D of the holder 24D is disposed on top of the thin-walled portion 152A of each lining 15A, and in this state, presses each lining 15A against the bottom surface of the groove 22A. Even in this configuration, the common holder 24D suppresses positional deviation of each lining 15A in the length direction of the groove 22A (X direction in FIG. 17). This reduces the number of parts and the number of man-hours required for assembling the parts.

[0046] The present invention is not limited to the above-described embodiments and includes various modifications. For example, the above-described embodiments have been described in detail to facilitate understanding of the present invention, but the present invention is not necessarily limited to those including all of the configurations described in the above-described embodiments. Furthermore, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment. It is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to delete part of the configuration of each embodiment, add other configurations, or replace it with other configurations. [Explanation of symbols]

[0047] 10... Elevator brake device, 11... Drum, 11a... Outer circumferential surface, 15, 15A... Lining, 16, 16A... Shoe, 20, 20A... Opposing surface, 22, 22A... Groove, 24, 24B, 24C, 24D... Holder, 243, 243C, 243D... Pressing portion, 243a... Surface (contact surface), G... Gap

Claims

1. A brake device for an elevator comprising: a drum connected to a hoist of an elevator; a lining that contacts an outer peripheral surface of the drum to apply a braking force to the drum; and a shoe to which the lining is attached, The lining is divided into a plurality of sections in the circumferential direction of the drum, The shoe has a surface facing the outer circumferential surface of the drum, and a plurality of grooves are formed at intervals in the circumferential direction of the drum, The lining is attached to the shoe in a state where it is fitted into the recessed groove. Brake device for elevators.

2. The recessed groove is formed in a dovetail groove shape, At least a portion of the lining is formed in a trapezoid shape corresponding to the dovetail groove shape. The elevator brake device according to claim 1.

3. The lining is configured to be insertable into the groove from the width direction of the shoe. The elevator brake device according to claim 1.

4. A gap is provided at the fitting portion between the lining and the recessed groove. The elevator brake device according to claim 1.

5. a holder for preventing the lining from shifting in position in the longitudinal direction of the groove; The elevator brake device according to claim 1.

6. The holder has a pressing portion that presses the lining against the bottom surface of the recessed groove. The elevator brake device according to claim 5.

7. The holder has a contact surface that comes into contact with the outer peripheral surface of the drum when the wear amount of the lining reaches a predetermined amount, and at least the contact surface is colored. The elevator brake device according to claim 5.

8. The positional deviation of each of the divided linings is suppressed by the common holder. The elevator brake device according to claim 5.

9. The holder is attached to the end surface of the shoe so as to sandwich the lining in the width direction of the shoe. The elevator brake device according to claim 5.

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