EP1538123B1 - Brake device of elevator hoist - Google Patents
Brake device of elevator hoist Download PDFInfo
- Publication number
- EP1538123B1 EP1538123B1 EP02765508A EP02765508A EP1538123B1 EP 1538123 B1 EP1538123 B1 EP 1538123B1 EP 02765508 A EP02765508 A EP 02765508A EP 02765508 A EP02765508 A EP 02765508A EP 1538123 B1 EP1538123 B1 EP 1538123B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- braking
- brake arm
- segment
- pressing
- disposed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
- B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
- B66D5/24—Operating devices
- B66D5/30—Operating devices electrical
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
- B66B11/04—Driving gear ; Details thereof, e.g. seals
- B66B11/08—Driving gear ; Details thereof, e.g. seals with hoisting rope or cable operated by frictional engagement with a winding drum or sheave
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
- B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
- B66D5/06—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with radial effect
- B66D5/08—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with radial effect embodying blocks or shoes
Definitions
- the present invention relates to an elevator hoisting machine braking apparatus disposed on an elevator hoisting machine for braking rotation of a rotating portion.
- a braking surface is disposed on an inner circumference of a cylindrical rotating portion.
- a pivotable brake arm is disposed inside the rotating portion.
- a braking segment separably placed in contact with the braking surface by pivoting of the brake arm is mounted to the brake arm.
- the brake arm is forced by a braking spring in such a direction that the braking segment contacts the braking surface.
- An electromagnet is disposed inside the rotating portion.
- An armature attracted by the electromagnet is linked to the brake arm by means of a linking pin.
- the electromagnet When the electromagnet is not excited, the braking segment is pressed against the braking surface by the braking spring, braking rotation of the rotating portion by friction.
- the armature By exciting the electromagnet, the armature can be attracted to the electromagnet, separating the braking segment from the braking surface counter to the braking spring, and releasing the brake.
- the present invention aims to solve the above problems and an object of the present invention is to provide an elevator hoisting machine braking apparatus enabling a stable attracting operation to be achieved while reducing time spent on mounting and adjusting, and enabling strength of a brake arm to be reduced.
- an elevator hoisting machine braking apparatus including: a cylindrical rotating portion in which a braking surface is disposed on an inner circumference; a supporting portion fixed relative to a fixed portion of an elevator hoisting machine; a brake arm disposed inside the rotating portion and pivotably supported by the supporting portion; a braking segment mounted to the brake arm and separably placed in contact with the braking surface by pivoting of the brake arm; and a pressing and attracting means for braking rotation of the rotating portion by pressing the braking segment against the braking surface by means of the brake arm and for releasing braking of the rotating portion by attracting the brake arm such that the braking segment separates from the braking surface, wherein: a first spherical seat is interposed between the brake arm and the braking segment; a second spherical seat is interposed between the brake arm and the pressing and attracting means; and a central portion of the braking segment is pressed against the braking surface during braking by means
- FIG. 1 is a partially-sectioned front elevation showing an elevator hoisting machine braking apparatus according to Embodiment 1 of the present invention.
- a cylindrical brake drum 1 constituting a rotating portion is rotated by a driving force from a motor of an elevator hoisting machine.
- the brake drum 1 is rotated together with a drive sheave (not shown) around which an elevator main rope is wound.
- a braking surface 1a is disposed on an inner circumference of the brake drum 1.
- a frame 2 functioning as a supporting portion that is fixed relative to a fixed portion of the elevator hoisting machine is disposed inside the brake drum 1.
- An arc-shaped brake arm 3 is supported by the frame 2 so as to be pivotable around a pin 4.
- the brake arm 3 is disposed inside the brake drum 1 so as to face the braking surface 1a.
- the pin 4 is disposed on a base end portion of the brake arm 3.
- a braking segment accommodating recess portion 3a is disposed on a surface of the brake arm 3 facing the braking surface 1a.
- a screw-threaded aperture 3b extending in a radial direction of the brake drum 1 and passing through the brake arm 3 is disposed in a bottom portion of the braking segment accommodating recess portion 3a.
- a braking segment 5 is mounted in a vicinity of a tip portion of the brake arm 3.
- the braking segment 5 is disposed inside the braking segment accommodating recess portion 3a.
- the braking segment 5 is separably placed in contact with the braking surface 1a by pivoting of the brake arm 3.
- a first spherical seat 6 is interposed between the brake arm 3 and the braking segment 5.
- the first spherical seat 6 is disposed so as to be coaxial with the screw-threaded aperture 3b.
- a first spherical recess portion 5a coupling with the first spherical seat 6 is formed in a central portion of a surface of the braking segment 5 on an opposite side from a surface contacting the braking surface 1a.
- a first end portion of a stroke adjusting screw 7 is screwed into the screw-threaded aperture 3b from an opposite side to the first spherical seat 6.
- a second spherical seat 8 is formed integrally on a second end portion of the stroke adjusting screw 7.
- a locknut 9 for fixing an amount of fastening of the stroke adjusting screw 7 inside the screw-threaded aperture 3b is screwed onto an intermediate portion of the stroke adjusting screw 7.
- a disk-shaped armature 10 is linked to the second end portion of the stroke adjusting screw 7.
- a strike plate 11 is interposed between the armature 10 and the second spherical seat 8.
- a second spherical recess portion 11a coupling with the second spherical seat 8 is formed in the strike plate 11.
- a plurality of spherical-seat leaf springs 12 for pressing the second spherical seat 8 against the strike plate 11 are mounted to the armature 10.
- An electromagnet 13 facing the armature 10 is secured to the frame 2.
- a plurality of braking springs 14 for braking rotation of the brake drum 1 by pressing the braking segment 5 against the braking surface 1a are disposed between the electromagnet 13 and the armature 10.
- the braking segment 5 is pressed against the braking surface 1a by the braking springs 14 through the armature 10, the strike plate 11, the second spherical seat 8, the stroke adjusting screw 7, the brake arm 3, and the first spherical seat 6.
- the armature 10 can be attracted by the electromagnet 13 so as to act against the braking springs 14, separating the braking segment 5 from the braking surface 1a.
- the pressing and attracting means 15 in Embodiment 1 includes the armature 10, the electromagnet 13, and the braking springs 14.
- the first spherical seat 6 is disposed, relative to the second spherical seat 8, in a direction that the pressing and attracting means 15 presses the second spherical seat 8.
- the first and second spherical seats 6 and 8 are disposed in a straight line extending along a resultant force vector of the pressing forces from the braking springs 14.
- Figure 2 is a right side elevation showing a mounting construction of the braking segment 5 in Figure 1
- Figure 3 is a cross section taken along line III - III in Figure 2 .
- the braking segment 5 is mounted to the brake arm 3 by being pressed against the first spherical seat 6 by a pair of braking-segment leaf springs 16.
- the braking segment 5 is pressed toward a central direction of the first spherical seat 6 by the braking-segment leaf springs 16.
- the braking-segment leaf springs 16 are mounted to the brake arm 3 by the plurality of bolts 17.
- the armature 10 When the electromagnet 13 is excited, the armature 10 is attracted toward the electromagnet 13 counter to the braking springs 14 and displaces, separating the braking segment 5 from the braking surface 1a. Thus, braking of the brake drum 1 is released, and the brake drum 1 is rotated together with the drive sheave by the driving force from the motor.
- an operating stroke of the braking segment 5 is adjusted by loosening the locknut 9 and adjusting the amount of fastening of the stroke adjusting screw 7 inside the screw-threaded aperture 3b. More specifically, by tightening the stroke adjusting screw 7 to displace it toward the braking segment 5, a gap between the armature 10 and the electromagnet 13 during braking is increased, thereby also increasing the operating stroke of the braking segment 5. Conversely, by loosening the stroke adjusting screw 7 to displace it toward the electromagnet 13, the gap between the armature 10 and the electromagnet 13 during braking is reduced, thereby also reducing the operating stroke of the braking segment 5.
- a stable attracting operation can be achieved without having to adjust the mounted angle of the armature 10, even when the precision of the attracting surface of the armature 10 relative to the brake arm 3 is low.
- the first spherical seat 6 is disposed, relative to the second spherical seat 8, in a direction that the pressing and attracting means 15 presses the second spherical seat 8, there is no bending moment acting on the brake arm 3, enabling the strength of the brake arm 3 to be reduced, thereby enabling the brake arm 3 to be made thinner.
- the second spherical seat 8 and the strike plate 11 do not separate from the armature 10 during the release operation, enabling the release operation to be stabilized. Furthermore, the brake arm 3 can be drawn closer during the release operation.
- the braking segment 5 is mounted to the brake arm 3 by being pressed against the first spherical seat 6 by braking-segment leaf springs 16, removal and replacement of the braking segment 5 can be performed easily, simply by removing the braking-segment leaf springs 16. Consequently,maintainabilitycan be improved even in a braking apparatus mounted in a limited space inside the brake drum 1.
- the braking segment 5 is pressed toward a central direction of the first spherical seat 6 by the braking-segment leaf springs 16, the braking segment 5 is displaced and placed in contact with the braking surface 1a while constantly maintaining its attitude relative to the braking surface 1a. Consequently, the braking segment 5 can be stably pressed against the brake drum 1.
- Figure 4 is a partially-sectioned front elevation showing an elevator hoisting machine braking apparatus according to Embodiment 2 of the present invention
- Figure 5 is a right side elevation showing a mounting construction of a braking segment in Figure 4 .
- a fixed rod 21 passing through a tip portion of a brake arm 3 being an end portion at an opposite end of a braking segment 5 from a pin 4 (a pivot point) is fixed to an armature 10.
- a spring bearing portion 21a is disposed on a tip portion of the fixed rod 21.
- a first backlash preventing spring (a coil spring) 22 for forcing the brake arm 3 toward the pressing and attracting means 15 is disposed between the spring bearing portion 21a and the tip portion of the brake arm 3.
- a plurality of second backlash preventing springs 23 for forcing the brake arm 3 in such a direction as to be separated from the pressing and attracting means 15 are disposed between the brake arm 3 and the armature 10 in a vicinity of the pin 4 (closer to the pin 4 than the braking segment 5) .
- These backlash preventing springs 23 are disposed so as to be distributed uniformly in an axial direction of the pin 4 relative to an axial center of the pin 4, and are also disposed within a range of an axial length of the pin 4.
- the spherical-seat leaf springs 12 shown in Embodiment 1 can be omitted.
- second backlash preventing springs 23 for forcing the brake arm 3 in such a direction as to be separated from the pressing and attracting means 15 are disposed between the brake arm 3 and the armature 10 in a vicinity of the pin 4, even if disturbances by twisting forces such as that represented by the arrow A in Figure 5 act on the brake arm 3, backlash is prevented from arising in the operation of the brake arm 3, enabling the operation of the brake arm 3 to be stabilized.
- the first backlash preventing spring 22 is disposed between the armature 10 and the brake arm 3, but it may also be disposed between the electromagnet 13 and the brake arm 3.
- the second backlash preventing springs 23 are disposed between the armature 10 and the brake arm 3, but they may also be disposed between the electromagnet 13 and the brake arm 3.
- first and second backlash preventing springs 22 and 23 are provided, but the second backlash preventing springs 23 may also be omitted and only a first backlash preventing spring 22 provided.
- first backlash preventing spring 22 may also be omitted and only second backlash preventing springs 23 provided. In that case, it is necessary for the second spherical seat 8 to be pressed against the pressing and attracting means 15 by spherical-seat leaf springs 12, etc., such as those shown in Embodiment 1, for example.
- braking apparatus only one braking apparatus is shown in Figure 1 and Figure 4 , but two braking apparatuses may also be disposed inside the brake drum with bilateral symmetry. Three or more braking apparatuses can also be disposed inside the brake drum.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Braking Arrangements (AREA)
- Cage And Drive Apparatuses For Elevators (AREA)
Description
- The present invention relates to an elevator hoisting machine braking apparatus disposed on an elevator hoisting machine for braking rotation of a rotating portion.
- In conventional elevator hoisting machine braking apparatuses, such as that disclosed in Japanese Patent Laid-Open No.
2000-289954 - An electromagnet is disposed inside the rotating portion. An armature attracted by the electromagnet is linked to the brake arm by means of a linking pin. When the electromagnet is not excited, the braking segment is pressed against the braking surface by the braking spring, braking rotation of the rotating portion by friction. By exciting the electromagnet, the armature can be attracted to the electromagnet, separating the braking segment from the braking surface counter to the braking spring, and releasing the brake.
- However, in conventional braking apparatuses, it is necessary to adjust the mounted angle of the armature in order to attract the entire surface of the armature uniformly, requiring a great deal of adjustment time. Furthermore, since the braking spring is disposed at an opposite end of the brake arm from a pivot point and a bending moment acts on the brake arm due to pressure from the braking spring, it has been necessary to increase the strength of the brake arm.
- The present invention aims to solve the above problems and an object of the present invention is to provide an elevator hoisting machine braking apparatus enabling a stable attracting operation to be achieved while reducing time spent on mounting and adjusting, and enabling strength of a brake arm to be reduced.
- In order to achieve the above object, according to one aspect of the present invention, there is provided an elevator hoisting machine braking apparatus including: a cylindrical rotating portion in which a braking surface is disposed on an inner circumference; a supporting portion fixed relative to a fixed portion of an elevator hoisting machine; a brake arm disposed inside the rotating portion and pivotably supported by the supporting portion; a braking segment mounted to the brake arm and separably placed in contact with the braking surface by pivoting of the brake arm; and a pressing and attracting means for braking rotation of the rotating portion by pressing the braking segment against the braking surface by means of the brake arm and for releasing braking of the rotating portion by attracting the brake arm such that the braking segment separates from the braking surface, wherein: a first spherical seat is interposed between the brake arm and the braking segment; a second spherical seat is interposed between the brake arm and the pressing and attracting means; and a central portion of the braking segment is pressed against the braking surface during braking by means of the first and second spherical seats.
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Figure 1 is a partially-sectioned front elevation showing an elevator hoisting machine braking apparatus according toEmbodiment 1 of the present invention; -
Figure 2 is a right side elevation showing a mounting construction of a braking segment inFigure 1 ; -
Figure 3 is a cross section taken along line III - III inFigure 2 ; -
Figure 4 is a partially-sectioned front elevation showing an elevator hoisting machine braking apparatus according toEmbodiment 2 of the present invention; and -
Figure 5 is a right side elevation showing a mounting construction of a braking segment inFigure 4 . - Preferred embodiments of the present invention will now be explained with reference to the drawings.
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Figure 1 is a partially-sectioned front elevation showing an elevator hoisting machine braking apparatus according toEmbodiment 1 of the present invention. In the figure, acylindrical brake drum 1 constituting a rotating portion is rotated by a driving force from a motor of an elevator hoisting machine. Thebrake drum 1 is rotated together with a drive sheave (not shown) around which an elevator main rope is wound. Abraking surface 1a is disposed on an inner circumference of thebrake drum 1. - A
frame 2 functioning as a supporting portion that is fixed relative to a fixed portion of the elevator hoisting machine is disposed inside thebrake drum 1. An arc-shaped brake arm 3 is supported by theframe 2 so as to be pivotable around apin 4. Thebrake arm 3 is disposed inside thebrake drum 1 so as to face thebraking surface 1a. Thepin 4 is disposed on a base end portion of thebrake arm 3. - A braking segment accommodating
recess portion 3a is disposed on a surface of thebrake arm 3 facing thebraking surface 1a. A screw-threadedaperture 3b extending in a radial direction of thebrake drum 1 and passing through thebrake arm 3 is disposed in a bottom portion of the braking segment accommodatingrecess portion 3a. - A
braking segment 5 is mounted in a vicinity of a tip portion of thebrake arm 3. Thebraking segment 5 is disposed inside the braking segment accommodatingrecess portion 3a. Thebraking segment 5 is separably placed in contact with thebraking surface 1a by pivoting of thebrake arm 3. A firstspherical seat 6 is interposed between thebrake arm 3 and thebraking segment 5. The firstspherical seat 6 is disposed so as to be coaxial with the screw-threadedaperture 3b. A firstspherical recess portion 5a coupling with the firstspherical seat 6 is formed in a central portion of a surface of thebraking segment 5 on an opposite side from a surface contacting thebraking surface 1a. - A first end portion of a
stroke adjusting screw 7 is screwed into the screw-threadedaperture 3b from an opposite side to the firstspherical seat 6. A secondspherical seat 8 is formed integrally on a second end portion of thestroke adjusting screw 7. Alocknut 9 for fixing an amount of fastening of thestroke adjusting screw 7 inside the screw-threadedaperture 3b is screwed onto an intermediate portion of thestroke adjusting screw 7. - A disk-
shaped armature 10 is linked to the second end portion of thestroke adjusting screw 7. Astrike plate 11 is interposed between thearmature 10 and the secondspherical seat 8. A secondspherical recess portion 11a coupling with the secondspherical seat 8 is formed in thestrike plate 11. A plurality of spherical-seat leaf springs 12 for pressing the secondspherical seat 8 against thestrike plate 11 are mounted to thearmature 10. - An
electromagnet 13 facing thearmature 10 is secured to theframe 2. A plurality ofbraking springs 14 for braking rotation of thebrake drum 1 by pressing thebraking segment 5 against thebraking surface 1a are disposed between theelectromagnet 13 and thearmature 10. - The
braking segment 5 is pressed against thebraking surface 1a by thebraking springs 14 through thearmature 10, thestrike plate 11, the secondspherical seat 8, thestroke adjusting screw 7, thebrake arm 3, and the firstspherical seat 6. By exciting theelectromagnet 13, thearmature 10 can be attracted by theelectromagnet 13 so as to act against thebraking springs 14, separating thebraking segment 5 from thebraking surface 1a. - The pressing and attracting means 15 in
Embodiment 1 includes thearmature 10, theelectromagnet 13, and thebraking springs 14. The firstspherical seat 6 is disposed, relative to the secondspherical seat 8, in a direction that the pressing and attracting means 15 presses the secondspherical seat 8. In other words, the first and secondspherical seats braking springs 14. - Next,
Figure 2 is a right side elevation showing a mounting construction of thebraking segment 5 inFigure 1 , andFigure 3 is a cross section taken along line III - III inFigure 2 . In the figures, thebraking segment 5 is mounted to thebrake arm 3 by being pressed against the firstspherical seat 6 by a pair of braking-segment leaf springs 16. Thebraking segment 5 is pressed toward a central direction of the firstspherical seat 6 by the braking-segment leaf springs 16. The braking-segment leaf springs 16 are mounted to thebrake arm 3 by the plurality ofbolts 17. - Next, operation will be explained. When the
electromagnet 13 is not excited, thebraking segment 5 is pressed against thebraking surface 1a by the spring forces from thebraking springs 14, braking rotation of thebrake drum 1 by friction. Here, a single central point of thebraking segment 5 is pressed against thebraking surface 1a. - When the
electromagnet 13 is excited, thearmature 10 is attracted toward theelectromagnet 13 counter to thebraking springs 14 and displaces, separating thebraking segment 5 from thebraking surface 1a. Thus, braking of thebrake drum 1 is released, and thebrake drum 1 is rotated together with the drive sheave by the driving force from the motor. - In addition, an operating stroke of the
braking segment 5 is adjusted by loosening thelocknut 9 and adjusting the amount of fastening of thestroke adjusting screw 7 inside the screw-threadedaperture 3b. More specifically, by tightening thestroke adjusting screw 7 to displace it toward thebraking segment 5, a gap between thearmature 10 and theelectromagnet 13 during braking is increased, thereby also increasing the operating stroke of thebraking segment 5. Conversely, by loosening thestroke adjusting screw 7 to displace it toward theelectromagnet 13, the gap between thearmature 10 and theelectromagnet 13 during braking is reduced, thereby also reducing the operating stroke of thebraking segment 5. - In a braking apparatus of this kind, because not only is a first
spherical seat 6 disposed between thebrake arm 3 and thebraking segment 5 but a secondspherical seat 8 is also disposed between thebrake arm 3 and thearmature 10, a stable attracting operation can be achieved without having to adjust the mounted angle of thearmature 10, even when the precision of the attracting surface of thearmature 10 relative to thebrake arm 3 is low. - Because the first
spherical seat 6 is disposed, relative to the secondspherical seat 8, in a direction that the pressing and attractingmeans 15 presses the secondspherical seat 8, there is no bending moment acting on thebrake arm 3, enabling the strength of thebrake arm 3 to be reduced, thereby enabling thebrake arm 3 to be made thinner. - In addition, because spherical-
seat leaf springs 12 for pressing the secondspherical seat 8 against thestrike plate 11 are mounted to thearmature 10, the secondspherical seat 8 and thestrike plate 11 do not separate from thearmature 10 during the release operation, enabling the release operation to be stabilized. Furthermore, thebrake arm 3 can be drawn closer during the release operation. - Furthermore, because the
braking segment 5 is mounted to thebrake arm 3 by being pressed against the firstspherical seat 6 by braking-segment leaf springs 16, removal and replacement of thebraking segment 5 can be performed easily, simply by removing the braking-segment leaf springs 16. Consequently,maintainabilitycan be improved even in a braking apparatus mounted in a limited space inside thebrake drum 1. - Because the
braking segment 5 is pressed toward a central direction of the firstspherical seat 6 by the braking-segment leaf springs 16, thebraking segment 5 is displaced and placed in contact with thebraking surface 1a while constantly maintaining its attitude relative to thebraking surface 1a. Consequently, thebraking segment 5 can be stably pressed against thebrake drum 1. - Next,
Figure 4 is a partially-sectioned front elevation showing an elevator hoisting machine braking apparatus according toEmbodiment 2 of the present invention, andFigure 5 is a right side elevation showing a mounting construction of a braking segment inFigure 4 . - In the figures, a fixed
rod 21 passing through a tip portion of abrake arm 3 being an end portion at an opposite end of abraking segment 5 from a pin 4 (a pivot point) is fixed to anarmature 10. Aspring bearing portion 21a is disposed on a tip portion of the fixedrod 21. A first backlash preventing spring (a coil spring) 22 for forcing thebrake arm 3 toward the pressing and attractingmeans 15 is disposed between thespring bearing portion 21a and the tip portion of thebrake arm 3. - A plurality of second
backlash preventing springs 23 for forcing thebrake arm 3 in such a direction as to be separated from the pressing and attractingmeans 15 are disposed between thebrake arm 3 and thearmature 10 in a vicinity of the pin 4 (closer to thepin 4 than the braking segment 5) . Thesebacklash preventing springs 23 are disposed so as to be distributed uniformly in an axial direction of thepin 4 relative to an axial center of thepin 4, and are also disposed within a range of an axial length of thepin 4. - In a braking apparatus of this kind, because the
brake arm 3 is forced toward the pressing and attractingmeans 15 by the firstbacklash preventing spring 22, even if there is a gap between thepin 4 and thebrake arm 3 or between thepin 4 and theframe 2, due to manufacturing errors, etc., thepin 4 is always pressed in a constant direction. Consequently, backlash is prevented from arising in the operation of thebrake arm 3, enabling the operation of thebrake arm 3 to be stabilized. - Because the second
spherical seat 8 and thestrike plate 11 are also pressed against thearmature 10 by the firstbacklash preventing spring 22, the spherical-seat leaf springs 12 shown inEmbodiment 1 can be omitted. - In addition, because second
backlash preventing springs 23 for forcing thebrake arm 3 in such a direction as to be separated from the pressing and attractingmeans 15 are disposed between thebrake arm 3 and thearmature 10 in a vicinity of thepin 4, even if disturbances by twisting forces such as that represented by the arrow A inFigure 5 act on thebrake arm 3, backlash is prevented from arising in the operation of thebrake arm 3, enabling the operation of thebrake arm 3 to be stabilized. - Moreover, in the above example, the first
backlash preventing spring 22 is disposed between thearmature 10 and thebrake arm 3, but it may also be disposed between theelectromagnet 13 and thebrake arm 3. - In the above example, the second
backlash preventing springs 23 are disposed between thearmature 10 and thebrake arm 3, but they may also be disposed between theelectromagnet 13 and thebrake arm 3. - In addition, in the above example, first and second
backlash preventing springs backlash preventing springs 23 may also be omitted and only a firstbacklash preventing spring 22 provided. - Furthermore, the first
backlash preventing spring 22 may also be omitted and only secondbacklash preventing springs 23 provided. In that case, it is necessary for the secondspherical seat 8 to be pressed against the pressing and attractingmeans 15 by spherical-seat leaf springs 12, etc., such as those shown inEmbodiment 1, for example. - Furthermore, only one braking apparatus is shown in
Figure 1 andFigure 4 , but two braking apparatuses may also be disposed inside the brake drum with bilateral symmetry. Three or more braking apparatuses can also be disposed inside the brake drum.
Claims (5)
- An elevator hoisting machine braking apparatus comprising:a cylindrical rotating portion (1) in which a braking surface (1a) is disposed on an inner circumference;a supporting portion (2) fixed relative to a fixed portion of an elevator hoisting machine;a brake arm (3) disposed inside said rotating portion (1) and pivotably supported by said supporting portion (2);a braking segment (5) mounted to said brake arm (3) and separably placed in contact with said braking surface (1a) by pivoting of said brake arm (3); anda pressing and attracting means (15) for braking rotation of said rotating portion (1) by pressing said braking segment (5) against said braking surface (1a) by means of said brake arm (3) and for releasing braking of said rotating portion (1) by attracting said brake arm (3) such that said braking segment (5) separates from said braking surface (1a),
characterized in thata first spherical seat (6) is interposed between said brake arm (3) and said braking segment (5),a second spherical seat (8) is interposed between said brake arm (3) and said pressing and attracting means (15), andsaid first spherical seat (6) is disposed relative to said second spherical seat (8) in a direction that said pressing and attracting means (15) presses said second spherical seat (8). - The elevator hoisting machine braking apparatus according to Claim 1, characterized in that said second spherical seat (8) is pressed against said pressing and attracting means (15) by a spherical-seat leaf spring (12).
- The elevator hoisting machine braking apparatus according to Claim 1, characterized in that said braking segment (5) is mounted to said brake arm (3) by being pressed against said first spherical seat (6) by a braking segment leaf spring (16).
- The elevator hoisting machine braking apparatus according to Claim 1, characterized in that a backlash preventing spring (22, 23) for forcing said brake arm (3) toward said pressing and attracting means (15) is disposed between said brake arm (3) and said pressing and attracting means (15) at an opposite end of said braking segment (5) from a pivot point.
- The elevator hoisting machine braking apparatus according to Claim 1, characterized in that
said brake arm (3) is supported on said supporting portion (2) by means of a pin (4),
a plurality of backlash preventing springs (22, 23) for forcing said brake arm (3) in such a direction as to be separated from said pressing and attracting means (15) are disposed between said brake arm (3) and said pressing and attracting means (15) in a vicinity of said pin (4), and
said backlash preventing springs (22, 23) are disposed so as to be distributed uniformly in an axial direction of said pin (4) relative to an axial center of said pin (4) and also disposed within a range of an axial length of said pin (4).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2002/009356 WO2004024611A1 (en) | 2002-09-12 | 2002-09-12 | Brake device of elevator hoist |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1538123A1 EP1538123A1 (en) | 2005-06-08 |
EP1538123A4 EP1538123A4 (en) | 2008-12-17 |
EP1538123B1 true EP1538123B1 (en) | 2010-03-10 |
Family
ID=31986094
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02765508A Expired - Fee Related EP1538123B1 (en) | 2002-09-12 | 2002-09-12 | Brake device of elevator hoist |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1538123B1 (en) |
JP (1) | JP4279780B2 (en) |
KR (1) | KR100623168B1 (en) |
CN (1) | CN1289381C (en) |
DE (1) | DE60235654D1 (en) |
WO (1) | WO2004024611A1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
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CN1916435B (en) * | 2005-08-17 | 2010-12-08 | 三阳工业株式会社 | Brake gear |
JP5471445B2 (en) * | 2007-10-02 | 2014-04-16 | 三菱電機株式会社 | Elevator hoisting machine and brake device |
EP2308788B1 (en) * | 2008-06-02 | 2016-01-13 | Mitsubishi Electric Corporation | Brake device for elevator hoist |
CN101823661B (en) * | 2010-03-17 | 2011-11-30 | 郭自刚 | Elevator tractor with internal contracting brake provided with mechanical cushioning device |
CN105090295B (en) * | 2014-05-19 | 2018-07-06 | 三菱电机株式会社 | Electro-magnetic braking device and the lift appliance using the electro-magnetic braking device |
CN104196925A (en) * | 2014-09-24 | 2014-12-10 | 安徽贵达汽车部件有限公司 | Braking horseshoe for vehicle |
KR101564880B1 (en) | 2015-05-14 | 2015-10-30 | 이창근 | Landing level holding apparatus for elevator |
JP6697792B2 (en) * | 2017-04-17 | 2020-05-27 | 三菱電機株式会社 | Elevator hoist brake and elevator hoist |
JP7031039B1 (en) * | 2021-04-20 | 2022-03-07 | 三菱電機株式会社 | Brake device and elevator hoist |
JP7191261B1 (en) * | 2022-04-15 | 2022-12-16 | 三菱電機株式会社 | Brake device for elevator hoisting machine |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52133473A (en) * | 1976-04-30 | 1977-11-08 | Mitsubishi Electric Corp | Brake drum device |
JP3537348B2 (en) * | 1999-04-05 | 2004-06-14 | 三菱電機株式会社 | Traction elevator hoist |
JP2002106611A (en) * | 2000-09-28 | 2002-04-10 | Sanyo Kogyo Kk | Braking device |
JP3635035B2 (en) * | 2001-02-15 | 2005-03-30 | 三陽工業株式会社 | Brake device |
JP4711574B2 (en) * | 2001-05-02 | 2011-06-29 | 三菱電機株式会社 | Braking method and braking device |
-
2002
- 2002-09-12 CN CNB028194403A patent/CN1289381C/en not_active Expired - Fee Related
- 2002-09-12 KR KR1020047007044A patent/KR100623168B1/en active IP Right Grant
- 2002-09-12 EP EP02765508A patent/EP1538123B1/en not_active Expired - Fee Related
- 2002-09-12 JP JP2004535842A patent/JP4279780B2/en not_active Expired - Fee Related
- 2002-09-12 WO PCT/JP2002/009356 patent/WO2004024611A1/en active Application Filing
- 2002-09-12 DE DE60235654T patent/DE60235654D1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
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JP4279780B2 (en) | 2009-06-17 |
DE60235654D1 (en) | 2010-04-22 |
CN1561309A (en) | 2005-01-05 |
EP1538123A1 (en) | 2005-06-08 |
JPWO2004024611A1 (en) | 2006-01-05 |
WO2004024611A1 (en) | 2004-03-25 |
CN1289381C (en) | 2006-12-13 |
EP1538123A4 (en) | 2008-12-17 |
KR20040083055A (en) | 2004-09-30 |
KR100623168B1 (en) | 2006-09-19 |
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