Brake release device, elevator, and hoist

Abstract

To provide a brake release device capable of easily holding the released state of a brake device, an elevator, and a hoist.SOLUTION: A brake release device 30 comprises: a release lever 31; an engagement part 33; and a holding mechanism 32. The release lever 30 is inserted into an opening 22 provided in a hoist. The engagement part 33 is provided at one end of the release lever 31 and engaged with a push-rod 14 of a brake device 6. The holding mechanism 32 is provided at the other end on a side opposite to the engagement part 33 in the release lever 31 with the opening 22 therebetween. The holding mechanism 32 holds the release lever 31 in a state where the release lever 31 presses the push-rod 14.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a brake release device for releasing a brake device provided in a hoist of an elevator, an elevator, and a hoist.

Background Art

[0002] Conventionally, an elevator includes a car, a counterweight, a rope connecting the car and the counterweight, and a hoist around which the rope is wound. The hoist has a drive unit, a rotating shaft connected to the drive unit, and a sheave rotatably supported by the rotating shaft around which the rope is wound. Further, the hoist is provided with a brake device for braking the sheave.

[0003] Also, as a conventional brake device, for example, there is one described in Patent Document 1. Patent Document 1 describes a brake device that operates a lever swingably supported by the attractive force of an electromagnet, integrally provides a pressure body on which the force of this lever acts, and swings an arm rotatably supported at an end away from this pressure body. And in the technique described in Patent Document 1, the braking force is released by separating a brake piece supported by the arm from a brake drum.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In addition, in the event of an emergency such as a power failure or an earthquake when the car makes an emergency stop, or during a regular inspection, the car may stop at a stop position different from the stop position during normal operation. In this case, it is necessary to manually and forcibly release the brake device that is in a braking state.

[0006] When releasing the lever-type brake device as described in Patent Document 1, it was necessary to push down the push rod with which the brake lever abuts and rotate the main lever in the direction opposite to the braking direction. Further, in order to hold the brake device in the released state, it was necessary to maintain the state in which the push rod was pushed down by the operator's hand. Therefore, in the conventional technology, it was difficult to hold the brake device in the released state.

[0007] In view of the above problems, an object of the present invention is to provide a brake release device, an elevator, and a hoist that can easily hold the brake device in the released state.

Means for Solving the Problems

[0008] In order to solve the above problems and achieve the above object, a brake release device is a brake release device that releases a lever-type brake device provided in a hoist of an elevator. The brake release device includes a release lever, an engaging portion, and a holding mechanism. The release lever is inserted into an opening provided in the hoist. The engaging portion is provided at one end of the release lever and engages with the push rod of the brake device. The holding mechanism is provided at the other end of the release lever on the side opposite to the engaging portion with the opening interposed therebetween. Further, the holding mechanism holds the release lever in a state where the release lever pushes down the push rod.

[0009] An elevator includes a car, a rope connected to the car, a sheave around which the rope is wound, and a hoist having a lever-type brake device that brakes the sheave. An opening into which the release lever of the brake release device for releasing the brake device is inserted is formed in the hoist. The brake device has a push rod that engages with an engaging portion provided at one end of the release lever. Then, on the hoist or the floor surface on which the hoist is installed, a holding mechanism that holds the release lever in a state where the release lever of the brake release device pushes down the push rod is installed.

[0010] The hoisting machine also includes a sheave around which a rope is wound, and a lever-type braking device for braking the sheave. An opening into which a release lever of a brake release device for releasing the braking device is inserted is formed in the hoisting machine. The braking device has a push rod that engages with an engaging portion provided at one end of the release lever. A holding mechanism for holding the release lever is installed in a state where the release lever in the brake release device presses down the push rod.

Advantages of the Invention

[0011] According to the brake release device, the elevator, and the hoisting machine configured as described above, the released state of the braking device can be easily maintained.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0013] Hereinafter, exemplary embodiments of the brake release device, the elevator, and the hoisting machine will be described with reference to FIGS. 1 to 6. In the drawings, common members are denoted by the same reference numerals.

[0014] 1. First Embodiment Example 1-1. Configuration of Hoisting Machine First, with reference to FIG. 1, the configuration of the hoisting machine of an elevator in which the brake release device according to the first embodiment example (hereinafter referred to as "this example") is used will be described. FIG. 1 is a front view showing the hoisting machine.

[0015] The hoisting machine 1 shown in FIG. 1 is provided in an elevator installed in a hoistway formed in a building structure. As shown in FIG. 1, the hoisting machine 1 has a machine base 2, a drive motor 3, a sheave 4, a gearbox 5, a lever-type brake device 6, and a motor support base 7. The drive motor 3, the sheave 4, the gearbox �, and the motor support base 7 are installed on the machine base 2.

[0016] A rope connected to a car for carrying people or goods and a counterweight is wound around the sheave 4. Further, a gearbox 5 is connected to a main shaft (not shown) of the sheave 4. And the gearbox 5 is connected to the rotating shaft of the drive motor 3. And the drive motor 3 rotationally drives the sheave 4. Also, a brake device 6 for controlling the rotation of the drive motor 3 is provided on the rotating shaft of the drive motor 3. The drive motor 3 is supported by the motor support base 7. The motor support base 7 is disposed between the drive motor 3 and the brake device 6.

[0017] 1-2. Configuration of Brake Device 6 Next, with reference to FIG. 2, the configuration of the brake device 6 will be described. FIG. 2 is a front view showing the brake device 6.

[0018] As shown in FIG. 2, the brake device 6 has a drum 9 connected to the rotating shaft of the drive motor 3, a pair of main levers 11, a lining 12, a pair of brake levers 13, a push rod 14, a biasing member 15, a pressure bolt 16, and an electromagnetic force generating unit 17 that generates electromagnetic force.

[0019] A pair of main levers 11 are arranged on the outer side in the radial direction of the drum 9 with the drum 9 interposed therebetween. One end of the main lever 11 is rotatably supported by a rotation shaft 18. The rotation shaft 18 is provided on the motor support base 7 or a brake base (not shown). A lining 12 is fixed to the main lever 11. The lining 12 is provided at a position facing the outer peripheral surface of the drum 9 in the main lever 11.

[0020] An urging member 15 is provided at the other end of the main lever 11 on the side opposite to the rotation shaft 18. As the urging member 15, for example, a compression coil spring is applied. The urging member 15 urges the other end of the main lever 11 in the direction approaching the drum 9. The main lever 11 is urged by the urging member 15 and rotates about the rotation shaft 18. Then, the lining 12 fixed to the main lever 11 is pressed against the outer peripheral surface of the drum 9. As a result, the drum 9 is sandwiched by the linings 12 fixed to the pair of main levers 11 and is braked.

[0021] Also, a pressure bolt 16 is attached in the vicinity of the urging member 15 at the other end of the main lever 11.

[0022] Also, a pair of brake levers 13 are arranged between the other ends of the pair of main levers 11. The brake lever 13 is formed in an L shape. A support pin 19 is provided at the corner of the brake lever 13. Then, the brake lever 13 is rotatably supported by the support pin 19. Also, the brake lever 13 is in contact with the pressure bolt 16 provided on the main lever 11.

[0023] Furthermore, above the upper and lower directions of one end portion of the pair of brake levers 13 that approach each other, a push rod 14 is disposed. When the push rod 14 presses one end portion of the brake lever 13, the brake lever 13 rotates about the support pin 19. Then, the pair of brake levers 13 urge the pressure bolt 16 in a direction in which the pair of brake levers 13 separate from each other. As a result, the pair of main levers 11 provided with the pressure bolt 16 rotate about the rotation shaft 18 in a direction opposite to the braking direction. Thereby, the braking of the braking device 6 is released. As a result, the drum 9 and the rotating shaft connected to the drum 9 can rotate.

[0024] Also, the push rod 14 is connected to the electromagnetic force generating unit 17. The electromagnetic force generating unit 17 is disposed above the pair of brake levers 13 in the vertical direction. The electromagnetic force generating unit 17 includes a plunger 17a connected to the push rod 14, an electromagnetic coil (not shown), a fixed iron core, and a movable iron core. The movable iron core is connected to the plunger 17a.

[0025] When an electric current flows through the electromagnetic coil by energization, the movable iron core and the plunger 17a move. As a result, the push rod 14 connected to the plunger 17a also moves. Then, the pair of brake levers 13 are pressed by the push rod 14 and displaced in a direction opposite to the braking direction, that is, in a direction to release the brake. Also, when the energization to the electromagnetic force generating unit 17 is cut off and no current flows through the electromagnetic coil, the pair of main levers 11 are displaced in the braking direction by the biasing force of the biasing member 15. That is, the braking device 6 is configured such that the brake is released only when the electromagnetic force generating unit 17 is energized.

[0026] Next, the configuration of the motor support base 7 will be described with reference to FIG. 3. FIG. 3 is a front view showing the motor support base 7. As shown in FIG. 3, the motor support base 7 has a main body portion 21 in a substantially flat plate shape. An opening 22 and a through hole 23 are formed in the main body portion 21. A drum 9 is inserted through the through hole 23 (see FIG. 2). Further, an opening 22 is formed above the through hole 23 in the vertical direction. As shown in FIG. 2, the opening 22 is formed at a position facing the push rod 14 of the brake device 6. A release lever 31 of a brake release device 30 described later is inserted into the opening 22.

[0027] 1-3. Configuration of Brake Release Device Next, the configuration of the brake release device 30 used in the brake device 6 having the above-described configuration will be described with reference to FIGS. 4 and 5. FIG. 4 is a front view showing the release lever 31 of the brake release device 30, and FIG. 5 is a front view showing the use state of the brake release device 30.

[0028] As shown in FIGS. 4 and 5, the brake release device 30 has a release lever 31 and a holding mechanism 32. As shown in FIG. 4, the release lever 31 is formed of a long member. An engaging portion 33 is formed at one end in the longitudinal direction of the release lever 31. When the brake release device 30 is used, the engaging portion 33 engages with the push rod 14 of the brake device 6. A bolt insertion hole 31a is formed in the release lever 31. The bolt insertion hole 31a is formed at the other end in the longitudinal direction of the release lever 31.

[0029] As shown in FIG. 5, the holding mechanism 32 has a jack bolt 34, a nut 35, and a support portion 36. The jack bolt 34 is inserted into the bolt insertion hole 31a of the release lever 31. A support portion 36 is disposed at the lower end in the vertical direction of the jack bolt 34. The support portion 36 is disposed, for example, on the drive motor 3 when the brake release device 30 is used. Therefore, the jack bolt 34 is disposed on the drive motor 3 via the support portion 36. And the jack bolt 34 stands upright upward in the vertical direction from the drive motor 3.

[0030] Also, a nut 35 is screwed onto the jack bolt 34. When the jack bolt 34 is inserted into the bolt insertion hole 31a of the release lever 31, the nut 35 is disposed below the release lever 31 in the vertical direction. Then, the release lever 31 abuts against the nut 35. And in this example, the nut 35 also serves as a holding portion that holds the other end of the release lever 31.

[0031] 1-4. Brake Release Operation Next, the release operation of the brake device 6 using the brake release device 30 having the above-described configuration will be described. As shown in FIG. 5, the holding mechanism 32 is installed in the drive motor 3. Also, the release lever 31 is inserted into the opening 22 of the motor support base 7, and the engaging portion 33 of the release lever 31 is engaged with the push rod 14. Therefore, one end portion in the longitudinal direction of the release lever 31 protrudes from the opening 22 of the motor support base 7 toward the brake device 6 side, and the other end portion in the longitudinal direction of the release lever 31 protrudes from the opening 22 of the motor support base 7 toward the drive motor 3 side. At this time, the jack bolt 34 is inserted through the bolt insertion hole 31a provided in the release lever 31. And the nut 35 abuts against the lower end portion in the vertical direction at the other end portion of the release lever 31.

[0032] Next, the nut 35 is operated to push up the other end portion of the release lever 31 on the side opposite to the engaging portion 33 in the vertical direction upward. At this time, the intermediate portion in the longitudinal direction of the release lever 31 abuts against the edge of the opening 22 of the motor support base 7. Then, the other end portion of the release lever 31 becomes the force point R1, the contact portion between the release lever 31 and the opening 22 becomes the fulcrum Q1, and the engaging portion 33 of the release lever 31 becomes the action point P1.

[0033] Therefore, when the other end of the release lever 31 is pushed upward, the engaging portion 33 of the release lever 31 is pushed downward in the vertical downward direction according to the principle of a lever. As a result, the push rod 14 that engages with the engaging portion 33 of the release lever 31 is pushed downward, and the main lever 11 of the brake device 6 is displaced in a direction opposite to the braking direction, that is, in the direction of releasing the brake, against the biasing force of the biasing member 15. As a result, the braking of the brake device 6 can be released by the brake release device 30.

[0034] Thus, according to the brake release device 30 of this example, by operating the nut 35, the release lever 31 can be easily pushed downward, and the push rod 14 of the brake device 6 can be pushed downward. As a result, the brake device 6 can be easily released by the brake release device 30, the physical burden on the operator can be reduced, and the workability can be improved.

[0035] Further, the other end of the release lever 31 is in contact with the nut 35, and the release lever 31 is held by the holding mechanism 32 in a state where the other end is pushed upward. As a result, the brake release device 30 can hold the brake device 6 in a released state without the operator holding the release lever 31. In this way, since the brake release device 30 can mechanically hold the released state of the brake device 6, the physical burden on the operator can be reduced. Furthermore, the workability and safety during the inspection work of the hoist 1 and the elevator can be improved.

[0036] 2. Second Embodiment Example Next, a brake release device according to a second embodiment example will be described with reference to FIGS. 6A and 6B. FIGS. 6A and 6B are views showing the usage state of the brake release device according to the second embodiment example.

[0037] The difference between the brake release device 30B according to this second embodiment and the brake release device according to the first embodiment lies in the configuration of the holding mechanism. Therefore, here, the same reference numerals are given to the parts common to the brake release device 30 according to the first embodiment, and the overlapping description is omitted.

[0038] As shown in FIGS. 6A and 6B, the brake release device 30B has a release lever 31B and a holding mechanism 42. The release lever 31B according to the second embodiment is not provided with a bolt insertion hole 31a.

[0039] The holding mechanism 42 has a jack bolt 44, a nut 45, a support portion 46, and a holding portion 47. The support portion 46 is formed in a substantially U-shaped cross-sectional shape when cut in the vertical direction. And the support portion 46 is arranged in the drive motor 3, for example. An insertion hole (not shown) is formed at the upper end portion in the vertical direction of the support portion 46. The jack bolt 44 is inserted through the insertion hole of the support portion 46. And the jack bolt 44 is supported by the support portion 46 so as to be movable in the vertical direction.

[0040] Note that the shape of the support portion 46 is not limited to a U-shape. For example, it may be arranged in the drive motor 3 and have an insertion hole through which the jack bolt 44 is inserted.

[0041] A holding portion 47 is provided at the lower end portion in the vertical direction of the jack bolt 44. The holding portion 47 is formed in a cylindrical shape. The other end portion of the release lever 31B is inserted into the cylindrical hole of the holding portion 47. A nut 45 is screwed onto the jack bolt 44. The nut 45 is arranged on the upper surface portion in the vertical direction at the upper end portion of the support portion 46. Also, the nut 45 is arranged at a location where the insertion hole is formed in the upper surface portion of the support portion 46.

[0042] When the nut 45 is rotated (operated), the jack bolt 44 is displaced in the vertical direction, and the holding portion 47 provided at the lower end of the jack bolt 44 is also displaced in the vertical direction. As a result, the other end of the release lever 31B inserted into the holding portion 47 is also displaced in the vertical direction. Consequently, the other end of the release lever 31B can be easily pulled up by the holding mechanism 42.

[0043] Also, when the other end of the release lever 31B is pulled up, due to the principle of the lever, the engaging portion 33 of the release lever 31 that engages with the push rod 14 is pushed downward in the vertical direction. Then, the push rod 14 is pushed down, and the main lever 11 of the brake device 6 is displaced in the direction opposite to the braking direction, that is, in the direction of releasing the brake. The holding mechanism 42 can hold the state where the release lever 31B is pulled up, that is, the state where the brake device 6 is released.

[0044] Since other configurations are the same as those of the brake release device 30 according to the above-described first embodiment example, the description thereof is omitted. Also in the brake release device 30B according to this second embodiment example, the same operations and effects as those of the brake release device 30 according to the above-described first embodiment example can be obtained.

[0045] Note that the present invention is not limited to the embodiments described above and shown in the drawings, and various modifications can be made without departing from the gist of the invention described in the claims.

[0046] In the above-described embodiment examples, an example in which the opening 22 into which the release levers 31 and 31B of the brake release devices 30 and 30B are inserted is provided in the motor support base 7 has been described, but the present invention is not limited thereto. For example, as the opening into which the release levers 31 and 31B are inserted, various holes such as a punched hole provided in the hoist 1 can be applied. And the opening into which the release levers 31 and 31B are inserted may be a hole facing the push rod 14 of the brake device 6.

[0047] Furthermore, although an example in which the support portions 36 and 46 of the holding mechanisms 32 and 42 are installed in the drive motor 3 has been described, the present invention is not limited thereto. As the locations where the support portions 36 and 46 are installed, for example, various other locations such as the machine base 2, a machine beam that supports the machine base 2, the floor surface of a machine room or a pit where the hoisting machine 1 is installed, etc. are applicable.

[0048] Although the hoisting machine 1 shown in FIG. 1 has been described as the hoisting machine to which the brake release device 30 according to the above-described embodiment example is applied, the present invention is not limited thereto. For example, it is applicable to brake devices provided in various other hoisting machines such as a hoisting machine in which a drive motor 3 is disposed at one end in the axial direction of the main shaft of the sheave 4.

[0049] In addition, in this specification, although words such as "parallel" and "orthogonal" are used, these do not mean only strict "parallel" and "orthogonal", but include "parallel" and "orthogonal", and further, a state of "substantially parallel" or "substantially orthogonal" within a range in which their functions can be exerted may be sufficient.

Explanation of Reference Numerals

[0050] 1... Hoisting machine, 2... Machine base, 3... Drive motor, 4... Sheave, 5... Gear box, 6... Brake device, 7... Motor support base, 9... Drum, 11... Main lever, 12... Lining, 13... Brake lever, 14... Push rod, 15... Biasing member, 16... Pressing bolt, 17... Electromagnetic force generating portion, 17a... Plunger, 18... Rotating shaft, 19... Support pin, 21... Main body portion, 22... Opening, 23... Through hole, 30, 30B... Brake release device, 31, 31B... Release lever, 31a... Bolt insertion hole, 32, 42... Holding mechanism, 33... Engaging portion, 34, 44... Jack bolt, 35... Nut (holding portion), 45... Nut, 36, 46... Support portion, 47... Holding portion, P1... Point of action, Q1... Fulcrum, R1... Point of force

Claims

1. In a brake release device for releasing a lever-type brake device provided in a hoist of an elevator, a release lever inserted into an opening provided in the hoist, an engaging portion provided at one end of the release lever and engaging with a push rod of the brake device, a holding mechanism provided at the other end of the release lever on the side opposite to the engaging portion with the opening interposed therebetween, and the holding mechanism holds the release lever in a state where the release lever pushes down the push rod Brake release device.

2. The holding mechanism is a support portion installed on the hoist or the floor surface on which the hoist is installed, a jack bolt supported by the support portion, a nut screwed onto the jack bolt, and a holding portion connected to the jack bolt and holding the other end of the release lever. The brake release device according to claim 1.

3. The release lever has a bolt insertion hole through which the jack bolt is inserted, The nut abuts against the release lever and also serves as the holding portion. The brake release device according to claim 2.

4. The support portion has an insertion hole through which the jack bolt is inserted, The nut is disposed at a location where the insertion hole is formed in the support portion, The holding portion is provided at an end of the jack bolt and has a cylindrical hole into which the release lever is inserted. The brake release device according to claim 2.

5. A car, a rope connected to the car, a hoist having a sheave around which the rope is wound and a lever-type brake device for braking the sheave, and an opening into which a release lever of a brake release device for releasing the brake device is inserted is formed in the hoist, The brake device has a push rod that engages with an engaging portion provided at one end of the release lever, A holding mechanism for holding the release lever in a state where the release lever pushes down the push rod in the brake release device is installed on the hoist or the floor surface on which the hoist is installed. Elevator.

6. The opening is formed at a position facing the push rod. The elevator according to claim 5.

7. The hoist is a drive motor for rotationally driving the sheave, and a motor support base disposed between the drive motor and the brake device and supporting the drive motor. The opening is formed in the motor support base The elevator according to claim 6

8. A sheave around which a rope is wound, A lever-type braking device for braking the sheave, and An opening is formed into which a release lever of a brake release device for releasing the braking device is inserted, The braking device has a push rod that engages with an engaging portion provided at one end of the release lever, A holding mechanism for holding the release lever is installed in a state where the release lever in the brake release device presses down the push rod A hoisting machine

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