EP1498380A1 - Emergency brake device for elevator - Google Patents
Emergency brake device for elevator Download PDFInfo
- Publication number
- EP1498380A1 EP1498380A1 EP02720525A EP02720525A EP1498380A1 EP 1498380 A1 EP1498380 A1 EP 1498380A1 EP 02720525 A EP02720525 A EP 02720525A EP 02720525 A EP02720525 A EP 02720525A EP 1498380 A1 EP1498380 A1 EP 1498380A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- braking
- mechanism portion
- sheave
- shaft
- brake shoe
- 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.)
- Withdrawn
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
- B66B5/04—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B15/00—Main component parts of mining-hoist winding devices
- B66B15/02—Rope or cable carriers
- B66B15/04—Friction sheaves; "Koepe" pulleys
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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
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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
Definitions
- the present invention relates to an emergency braking apparatus applied to an elevator in which a car and a counterweight are suspended at a first end and a second end, respectively, of a main rope wound around a sheave, and functions such that ascent of the car is stopped when the car ascends at greater than or equal to a rated velocity, for example.
- elevators are constructed such that a car and a counterweight are suspended at a first end and a second end, respectively, of main ropes wound around a drive sheave of a hoisting machine.
- a brake designed to apply a braking force as input to an electric motor is simultaneously interrupted is mounted to the hoisting machine in order to control inertial rotation of the hoisting machine automatically.
- an emergency stopping apparatus for gripping opposite sides of a guide rail with strong force is disposed on a side of the car, and the emergency stopping apparatus operates to stop the descent of the car if the speed governor detects an overspeed in the descent velocity.
- a supplementary emergency braking apparatus that functions independently from the brake and starts prior to the emergency stopping apparatus is required to further increase the safety level of the elevator.
- This supplementary emergency braking apparatus must generate a controlled reproducible braking effect, particularly when the elevator is moving in an upward direction. More specifically, in elevators of this kind, there is a danger that the car may suddenly ascend at greater than or equal to the rated velocity due to failure of the brake or due to the hoisting machine running out of control, etc. If the car ascends at greater than or equal to the rated velocity, there is a risk that the counterweight may collide with buffers at greater than or equal to design velocity, injuring passengers inside the car.
- a supplementary emergency braking apparatus provided with a mechanism for seizing a guide rail or a main rope directly has been installed on the same side as the counterweight, and if the car ascends at greater than or equal to a rated velocity, the supplementary emergency braking apparatus operates to seize the guide rail or the main rope directly and stop the ascent of the car.
- some disadvantages with this conventional countermeasure are that installation space is required for the supplementary emergency braking apparatus, that it may lead to damage to the guide rail or the main rope and to accidents, and also that the construction is complicated, giving rise to increases in equipment costs.
- an emergency braking apparatus in which a pressing body 3 is disposed facing a drive sheave 1 on an opposite side of a main rope 2 wound over the drive sheave 1 and a wedge-shaped braking member 4 between the drive sheave 1 and the pressing body 3.
- this conventional emergency braking apparatus it is claimed that during braking the braking member 4 is pushed in between the drive sheave 1 and the pressing body 3 and the main rope 2 is grasped between the drive sheave 1 and the braking member 4, thus achieving an appropriate braking effect.
- some disadvantages with this conventional emergency braking apparatus are that installation space is required for the apparatus and that it may lead to damage to the main rope and to accidents. Another disadvantage is that after activation this conventional emergency braking apparatus must be reset to its standby state manually.
- an emergency braking apparatus is proposed that is provided with: a drive sheave 6 fixed to a shaft 5; a star-shaped brake wheel 7 rotatably mounted to the shaft 5 so as to place a brake shoe 8 in contact with an annular end surface 6a of the drive sheave 6; a spring member 9 for pressing the star-shaped brake element 7 against the drive sheave 6; and an activating mechanism 12 constructed such that a braking bolt 11 is inserted and removed from between spokes 7a of the star-shaped brake wheel 7 by electromagnetic force from a solenoid 10.
- Another disadvantage with this conventional emergency braking apparatus is that because braking of the drive sheave 6 commences after the braking bolt 11 has been inserted between the spokes 7a and comes into contact with a spoke 7a, a time lag between activation and the commencement of braking arises due to the construction, and the car will increase velocity during this temporal delay.
- the present invention aims to solve the above problems and an object of the present invention is to provide an inexpensive elevator emergency braking apparatus operating to swiftly decelerate or stop a car when the car ascends at greater than or equal to a rated velocity, and not requiring special installation space.
- an elevator emergency braking apparatus for performing braking of an elevator in which a car is suspended at a first end of a main rope wound around an outer ring of a sheave and a counterweight is suspended at a second end of the main rope includes:
- an elevator emergency braking apparatus for performing braking of an elevator in which a car is suspended at a first end of a main rope wound around an outer ring of a sheave and a counterweight is suspended at a second end of the main rope includes:
- Figure 1 is a schematic diagram showing an elevator mounted with an emergency braking apparatus according to Embodiment 1 of the present invention
- Figure 2 is an enlarged partial side elevation showing a standby state of the emergency braking apparatus according to Embodiment 1 of the present invention
- Figure 3 is an enlarged partial side elevation showing an activated state of the emergency braking apparatus according to Embodiment 1 of the present invention
- Figure 4 is a cross section taken along line IV - IV in Figure 2 viewed from the direction of the arrows.
- a hoisting machine 22 is installed in a machine room 21 in an upper portion of a hoistway 20
- a car 23 is disposed so as to be guided by car guide rails 24 and be able to ascend and descend inside the hoistway 20
- a counterweight 25 is disposed so as to be guided by counterweight guide rails 26 and be able to ascend and descend inside the hoistway 20.
- a main rope 27 is wound around a drive sheave 28 of the hoisting machine 22 and a deflector sheave 29 installed inside the machine room 21.
- the car 23 is suspended at a first end of the main rope 27, and the counterweight 25 at a second end of the main rope 27.
- an emergency braking apparatus 100 is mounted to the drive sheave 28.
- the hoisting machine 22, as shown in Figure 2 is disposed inside the machine room 21 such that a frame 18 thereof is fixed to a floor surface of the machine room 21.
- the drive sheave 28 (a sheave) of the hoisting machine 21, as shown in Figure 4 is constituted by: a hub 28a; spokes 28b extending radially from the hub 28a; and an annular outer ring 28c linked to the hub 28a by means of the spokes 28b, the hub 28a being rotatably mounted to the frame 18 around an axle 19.
- Rope grooves 28d are formed on an outer peripheral wall surface of the outer ring 28c.
- the deflector sheave 29 (a sheave) is also constructed in a similar manner to the drive sheave 28.
- a brake and emergency stopping apparatus are provided.
- the emergency braking apparatus 100 is constituted by: a braking mechanism portion 30 for braking the drive sheave 28; and an activating mechanism portion 40 for activating the braking mechanism portion 30.
- the braking mechanism portion 30 is constituted by: a base portion 31; a pair of bolts 32 functioning as a guide member disposed so as to stand parallel to each other on this base portion 31; a movable portion 33 mounted to the pair of bolts 32 so as to be reciprocally movable in an axial direction; a brake shoe 34 mounted to a tip of this movable portion 33; adjusting nuts 35 respectively screwed onto a root portion of each of the bolts 32; and springs 36 respectively disposed in a compressed state between each of the adjusting nuts 35 and the movable portion 33.
- the brake shoe 34 is formed integrally with the movable portion 33 so as to cover head portions 32a of the bolts 32.
- the movable portion 33 is placed in a state of contact with the head portions 32a of the bolts 32 by the force of the springs 36.
- the base portion 31 of this braking mechanism portion 30 is mounted to the frame 18 so as to be pivotable about a shaft 38 parallel to the axle 19, the braking mechanism portion 30 adopting: a standby position in which the brake shoe 34 is separated from an inner circumferential wall surface 28e of the outer ring 28c of the drive sheave 28; and a braking position in which the braking mechanism portion 30 is placed in contact with a stopper 37 disposed so as to stand upright on the frame 18 and the brake shoe 34 is placed in contact with the inner circumferential wall surface 28e of the outer ring 28c of the drive sheave 28.
- the shaft 38 (a first shaft) is disposed inside the drive sheave 28 on a like side as the deflector sheave 29 relative to an up-down line (a vertical line) passing through a central axis of the axle 19 in Figure 2 and in a region between a left-right line (a horizontal line) passing through the central axis of the axle 19 and the perpendicular line so as to enable the standby position and the braking position to be adopted.
- the activating mechanism portion 40 is constituted by: a solenoid coil 41; and a plunger 42 composed of a magnetic material. This activating mechanism portion 40 is mounted to the frame 18 such that the direction of movement of the plunger 42 is vertical, a projecting end of the plunger 42 being linked to the movable portion 33 so as to be pivotable around a shaft 44 parallel to the shaft 38.
- an emergency braking apparatus 100 constructed in this manner, when an electric current is passed through the solenoid coil 41, the plunger 42 is magnetically attracted and retracts (moves upward in Figure 2), stopping when a stopper 42a comes into contact with a main body portion of the solenoid coil 41.
- the retracting force of this plunger 42 is transmitted to the braking member 30 by means of the movable portion 33, and the braking member 30 pivots around the shaft 38 counterclockwise in Figure 2.
- This braking member 30, as shown in Figure 2 is maintained in the standby position by the stopper 42a being placed in contact with the main body portion of the solenoid coil 41.
- the braking mechanism portion 30 moves toward the base portion 31 together with the rotation of the drive sheave 28 (clockwise in Figure 2) such that the movable portion 33 is guided by the bolts 32, pivots further while compressing the springs 36, and stops when placed in contact with the stopper 37, assuming the braking position shown in Figure 3. Then, a pressing force resulting from the compression of the springs 36 acts on the inner circumferential wall surface 28e by means of the brake shoe 34, generating a braking force between the brake shoe 34 and the inner circumferential wall surface 28e, and the car 23 is decelerated or stopped.
- an emergency braking apparatus 100 functions as an ascent safety apparatus capable of operating swiftly to perform deceleration or stopping of the car 23 when the ascent velocity of the car 23 exceeds a rated velocity.
- an ascent safety apparatus capable of operating swiftly to perform deceleration or stopping of the car 23 when the ascent velocity of the car 23 exceeds a rated velocity.
- the amount of pivoting from the standby position of the braking mechanism portion 30 to the braking position is constant, the amount of compression in the springs 36 is also constant, enabling the ascending car 23 to be decelerated or stopped by a constant braking force irrespective of velocity.
- adjusting nuts 35 are provided, if the adjusting nuts 35 are adjusted so that the amount of compression in the springs 36 is increased at the standby position, the pressing force of the brake shoe 34 on the inner circumferential wall surface 28e during braking can be increased. In other words, the braking force can be adjusted arbitrarily.
- the braking function is reliably exhibited by the brake shoe 34 cutting into the inner circumferential wall surface 28e in a wedging effect, thereby improving the safety level.
- this emergency braking apparatus 100 because the braking mechanism portion 30 can be returned from the braking position to the standby position by passing an electric current to the solenoid coil 41, a manual operation for resetting the emergency braking apparatus is also no longer necessary. Thus, because the emergency braking apparatus 100 can be activated repeatedly, the emergency braking apparatus 100 can also be activated when the car 23 is at a floor to stop rotation of the drive sheave 28. Thus, sudden abnormal ascent of the car 23 while passengers are boarding and leaving is reliably prevented, further increasing the safety level.
- the emergency braking apparatus 100 is constituted by a braking mechanism portion 30 including a base portion 31, a pair of bolts 32 disposed so as to stand on the base portion 31, a movable portion 33 movably disposed along shafts of the bolts 32 so as to be guided by the bolts 32, and having a brake shoe 34 mounted integrally to a tip, and springs 36 for forcing the movable portion 33 toward head portions 32a of the bolts 32; and an activating mechanism portion 40 including a solenoid coil 41 and a plunger 42, the construction of the apparatus is simplified, enabling cost reductions.
- the emergency braking apparatus 100 is disposed on a like side of a vertical line passing through the axle 19 as a deflector sheave 29, but the emergency braking apparatus 100 may also be disposed on an opposite side of the vertical line passing through the axle 19 from the deflector sheave 29.
- the emergency braking apparatus 100 functions as a descent safety apparatus and the emergency braking apparatus 100 operates swiftly to decelerate or stop the car 23 if abnormal velocity of the car 23 in a downward direction is detected.
- sudden dropping of the car while passengers are boarding and leaving can be prevented by operating the emergency braking apparatus 100 to prevent rotation of the drive sheave 23 that gives rise to the dropping of the car 23.
- Figure 5 is an enlarged partial side elevation showing a standby state of an emergency braking apparatus according to Embodiment 2 of the present invention.
- a braking mechanism portion 30 mounted so as to be pivotable around a shaft 38 (a first shaft) is disposed inside a drive sheave 28 and a braking position on a like side of a vertical line passing through a central axis of an axle 19 as a deflector sheave 29 and in a region between a horizontal line and the vertical line passing through the central axis of the axle 19 so as to adopt a standby position
- a braking mechanism portion 30 mounted so as to be pivotable around a shaft 38 (a second shaft) is disposed inside the drive sheave 28 on an opposite side of the vertical line passing through the central axis of the axle 19 from the deflector sheave 29 and in a region between a horizontal line and the vertical line passing through the central axis of the axle 19 so as to adopt a standby position and a braking position.
- the two emergency braking apparatuses 100 are disposed
- Embodiment 2 during normal operation of the car 23, an electric current is passed through the solenoid coils 41 of both of the emergency braking apparatuses 100 to maintain them in the standby position.
- Embodiment 2 because two emergency braking apparatuses 100 are deployed, and the first emergency braking apparatus 100 functions as an ascent safety apparatus, and the second emergency braking apparatus 100 functions as a descent safety apparatus, if abnormal upward or downward velocity of the car 23 is detected, the emergency braking apparatus 100 operates swiftly to decelerate or stop the car 23, improving the safety level.
- the two emergency braking apparatuses 100 are operated when the car 23 is at a floor in order to prevent rotation of the drive sheave 23 that gives rise to rising and dropping of the car 23, sudden rising and dropping of the car can be prevented while passengers are boarding and leaving, raising the safety level.
- the two emergency braking apparatuses 100 are disposed symmetrically relative to a vertical line passing through the axle 19, but it is not absolutely necessary for the two emergency braking apparatuses 100 to be disposed symmetrically relative to the vertical line passing through the axle 19; it is only necessary for the braking mechanism portion 30 of each of the emergency braking apparatuses 100 to be disposed so as to be able to adopt the standby position and the braking position.
- the braking mechanism portion 30 when the passage of electric current to the solenoid coil 41 of an emergency braking apparatus 100 is stopped, the braking mechanism portion 30 is set to the braking position by pivoting around the shaft 38 under its own weight, but the activating mechanism portion 40 may also be equipped with a spring for forcing the plunger 42 toward the braking mechanism portion 30, and when the passage of electric current to the solenoid coil 41 is stopped, the plunger 42 is moved by the force of the spring, the braking mechanism portion 30 thereby being set to the braking position by pivoting around the shaft 38.
- the amount of time from activation to the commencement of braking is shortened, enabling increases in the velocity of the car 23 resulting from the time lag from activation to the commencement of braking to be further suppressed.
- the plunger 42 and the movable portion 33 are linked so as to be pivotable about the shaft 44, but the plunger 42 and the movable portion 33 may also be linked by a universal joint. In that case, the transmission of force between the plunger 42 and the movable portion 33 is smooth, and it is no longer necessary to ensure the installation position of the activating mechanism portion 40 with high precision, facilitating assembly of the emergency braking apparatus 100.
- the emergency braking apparatus 100 is installed in the drive sheave 28, but similar effects can also be achieved if the emergency braking apparatus 100 is installed in the deflector sheave 29.
Abstract
The present invention provides an inexpensive elevator emergency
braking apparatus operating to swiftly decelerate or stop a car when the
car ascends at greater than or equal to a rated velocity, and not requiring
special installation space.
The elevator emergency braking apparatus includes a braking
mechanism portion mounted inside a sheave so as to be pivotable around a
first shaft parallel to an axle of the sheave and so as to be positioned on a
like side as a counterweight relative to a vertical line passing through the
axle, and being provided with a brake shoe at an opposite end from the first
shaft, the braking mechanism portion adopting a standby position in which
the brake shoe is separated from an inner circumferential wall surface of
an outer ring of the sheave and a braking position in which the brake shoe
contacts the inner circumferential wall surface of the outer ring; and
an activating mechanism portion for maintaining the braking mechanism portion in the standby position when not braking and maintaining the braking mechanism portion in the braking position when braking.
an activating mechanism portion for maintaining the braking mechanism portion in the standby position when not braking and maintaining the braking mechanism portion in the braking position when braking.
Description
- The present invention relates to an emergency braking apparatus applied to an elevator in which a car and a counterweight are suspended at a first end and a second end, respectively, of a main rope wound around a sheave, and functions such that ascent of the car is stopped when the car ascends at greater than or equal to a rated velocity, for example.
- Generally, elevators are constructed such that a car and a counterweight are suspended at a first end and a second end, respectively, of main ropes wound around a drive sheave of a hoisting machine. A brake designed to apply a braking force as input to an electric motor is simultaneously interrupted is mounted to the hoisting machine in order to control inertial rotation of the hoisting machine automatically. In addition, irrespective of the type of hoisting machine, or how the ropes are hung, etc, there is a risk that an elevator will exceed the capacity of normal safety apparatus if the ropes snap, or if the descent velocity of the car increases significantly for some other unforeseeable reason. For that reason, if the descent velocity of the car reaches a constant ratio of overspeed, it is necessary to stop the descent thereof completely. Thus, an emergency stopping apparatus for gripping opposite sides of a guide rail with strong force is disposed on a side of the car, and the emergency stopping apparatus operates to stop the descent of the car if the speed governor detects an overspeed in the descent velocity.
- In addition, a supplementary emergency braking apparatus that functions independently from the brake and starts prior to the emergency stopping apparatus is required to further increase the safety level of the elevator. This supplementary emergency braking apparatus must generate a controlled reproducible braking effect, particularly when the elevator is moving in an upward direction. More specifically, in elevators of this kind, there is a danger that the car may suddenly ascend at greater than or equal to the rated velocity due to failure of the brake or due to the hoisting machine running out of control, etc. If the car ascends at greater than or equal to the rated velocity, there is a risk that the counterweight may collide with buffers at greater than or equal to design velocity, injuring passengers inside the car.
- Thus, conventionally, a supplementary emergency braking apparatus provided with a mechanism for seizing a guide rail or a main rope directly has been installed on the same side as the counterweight, and if the car ascends at greater than or equal to a rated velocity, the supplementary emergency braking apparatus operates to seize the guide rail or the main rope directly and stop the ascent of the car. However, some disadvantages with this conventional countermeasure are that installation space is required for the supplementary emergency braking apparatus, that it may lead to damage to the guide rail or the main rope and to accidents, and also that the construction is complicated, giving rise to increases in equipment costs.
- In Japanese Patent Laid-Open No. HEI 6-199483 (Gazette), as shown in Figure 6, an emergency braking apparatus is proposed in which a
pressing body 3 is disposed facing adrive sheave 1 on an opposite side of amain rope 2 wound over thedrive sheave 1 and a wedge-shaped braking member 4 between thedrive sheave 1 and thepressing body 3. In this conventional emergency braking apparatus, it is claimed that during braking thebraking member 4 is pushed in between thedrive sheave 1 and thepressing body 3 and themain rope 2 is grasped between thedrive sheave 1 and thebraking member 4, thus achieving an appropriate braking effect. However, some disadvantages with this conventional emergency braking apparatus are that installation space is required for the apparatus and that it may lead to damage to the main rope and to accidents. Another disadvantage is that after activation this conventional emergency braking apparatus must be reset to its standby state manually. - In addition, in Japanese Patent Laid-Open No. HEI 5-193860 (Gazette), as shown in Figures 7 to 9, an emergency braking apparatus is proposed that is provided with: a
drive sheave 6 fixed to a shaft 5; a star-shaped brake wheel 7 rotatably mounted to the shaft 5 so as to place abrake shoe 8 in contact with anannular end surface 6a of thedrive sheave 6; aspring member 9 for pressing the star-shaped brake element 7 against thedrive sheave 6; and an activatingmechanism 12 constructed such that abraking bolt 11 is inserted and removed from betweenspokes 7a of the star-shaped brake wheel 7 by electromagnetic force from asolenoid 10. In this conventional emergency braking apparatus, during normal operation, the star-shaped brake wheel 7, which is pressed against thedrive sheave 6 by thespring member 9, rotates together with thedrive sheave 6, and during braking, thebraking bolt 11 is inserted between thespokes 7a of the star-shaped brake wheel 7, preventing the star-shaped brake wheel 7 from rotating. Thus, it is claimed that rotation of thedrive sheave 6 is stopped by friction between thebrake shoe 8 of the star-shaped brake wheel 7 and theend surface 6a of thedrive sheave 6 to achieve an appropriate braking effect. However, one disadvantage with this conventional emergency braking apparatus is that installation space is required for the apparatus. Another disadvantage with this conventional emergency braking apparatus is that because braking of thedrive sheave 6 commences after thebraking bolt 11 has been inserted between thespokes 7a and comes into contact with aspoke 7a, a time lag between activation and the commencement of braking arises due to the construction, and the car will increase velocity during this temporal delay. - The present invention aims to solve the above problems and an object of the present invention is to provide an inexpensive elevator emergency braking apparatus operating to swiftly decelerate or stop a car when the car ascends at greater than or equal to a rated velocity, and not requiring special installation space.
- According to one aspect of the present invention, an elevator emergency braking apparatus for performing braking of an elevator in which a car is suspended at a first end of a main rope wound around an outer ring of a sheave and a counterweight is suspended at a second end of the main rope includes:
- a first braking mechanism portion mounted inside the above sheave so as to be pivotable around a first shaft parallel to an axle of the sheave and so as to be positioned on a like side as the above counterweight relative to a vertical line passing through the axle, and being provided with a first brake shoe at an opposite end from the first shaft, the first braking mechanism portion adopting a first standby position in which the first brake shoe is separated from an inner circumferential wall surface of the outer ring of the above sheave and a first braking position in which the first brake shoe contacts the inner circumferential wall surface of the outer ring; and
- a first activating mechanism portion for maintaining the above first braking mechanism portion in the above first standby position when not braking and maintaining the above first braking mechanism portion in the above first braking position when braking.
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- According to another aspect of the present invention, an elevator emergency braking apparatus for performing braking of an elevator in which a car is suspended at a first end of a main rope wound around an outer ring of a sheave and a counterweight is suspended at a second end of the main rope includes:
- a braking mechanism portion mounted inside the above sheave so as to be pivotable around a second shaft parallel to an axle of the sheave and so as to be positioned on a like side as the above car relative to a vertical line passing through the axle, and being provided with a brake shoe at an opposite end from the second shaft, the braking mechanism portion adopting a standby position in which the brake shoe is separated from an inner circumferential wall surface of the outer ring of the above sheave and a braking position in which the brake shoe contacts the inner circumferential wall surface of the outer ring; and
- an activating mechanism portion for maintaining the above braking mechanism portion in the above standby position when not braking and maintaining the above braking mechanism portion in the above braking position when braking.
-
-
- Figure 1 is a schematic diagram showing an elevator mounted with
an emergency braking apparatus according to
Embodiment 1 of the present invention; - Figure 2 is an enlarged partial side elevation showing a standby
state of the emergency braking apparatus according to
Embodiment 1 of the present invention; - Figure 3 is an enlarged partial side elevation showing an activated
state of the emergency braking apparatus according to
Embodiment 1 of the present invention; - Figure 4 is a cross section taken along line IV - IV in Figure 2 viewed from the direction of the arrows;
- Figure 5 is an enlarged partial side elevation showing a standby
state of an emergency braking apparatus according to
Embodiment 2 of the present invention; - Figure 6 is an enlarged partial side elevation explaining a construction of a conventional emergency braking apparatus;
- Figure 7 is a cross section explaining a construction of a second conventional emergency braking apparatus;
- Figure 8 is a side elevation explaining the construction of the second emergency braking apparatus; and
- Figure 9 is an enlarged partial cross section explaining the construction of the second conventional emergency braking apparatus.
-
- Preferred embodiments of the present invention will now be explained with reference to the drawings.
- Figure 1 is a schematic diagram showing an elevator mounted with an emergency braking apparatus according to
Embodiment 1 of the present invention, Figure 2 is an enlarged partial side elevation showing a standby state of the emergency braking apparatus according toEmbodiment 1 of the present invention, Figure 3 is an enlarged partial side elevation showing an activated state of the emergency braking apparatus according toEmbodiment 1 of the present invention, and Figure 4 is a cross section taken along line IV - IV in Figure 2 viewed from the direction of the arrows. - In Figure 1, a hoisting
machine 22 is installed in amachine room 21 in an upper portion of ahoistway 20, acar 23 is disposed so as to be guided bycar guide rails 24 and be able to ascend and descend inside thehoistway 20, and acounterweight 25 is disposed so as to be guided bycounterweight guide rails 26 and be able to ascend and descend inside thehoistway 20. Amain rope 27 is wound around adrive sheave 28 of the hoistingmachine 22 and adeflector sheave 29 installed inside themachine room 21. Thecar 23 is suspended at a first end of themain rope 27, and thecounterweight 25 at a second end of themain rope 27. In addition, anemergency braking apparatus 100 is mounted to thedrive sheave 28. - Moreover, the hoisting
machine 22, as shown in Figure 2, is disposed inside themachine room 21 such that aframe 18 thereof is fixed to a floor surface of themachine room 21. The drive sheave 28 (a sheave) of the hoistingmachine 21, as shown in Figure 4, is constituted by: ahub 28a;spokes 28b extending radially from thehub 28a; and an annularouter ring 28c linked to thehub 28a by means of thespokes 28b, thehub 28a being rotatably mounted to theframe 18 around anaxle 19.Rope grooves 28d are formed on an outer peripheral wall surface of theouter ring 28c. The deflector sheave 29 (a sheave) is also constructed in a similar manner to thedrive sheave 28. In addition, although not shown, a brake and emergency stopping apparatus are provided. - Next, construction and operation of the
emergency braking apparatus 100 will be explained with reference to Figures 2 to 4. - The
emergency braking apparatus 100 is constituted by: abraking mechanism portion 30 for braking thedrive sheave 28; and anactivating mechanism portion 40 for activating thebraking mechanism portion 30. - The
braking mechanism portion 30 is constituted by: abase portion 31; a pair ofbolts 32 functioning as a guide member disposed so as to stand parallel to each other on thisbase portion 31; amovable portion 33 mounted to the pair ofbolts 32 so as to be reciprocally movable in an axial direction; abrake shoe 34 mounted to a tip of thismovable portion 33; adjustingnuts 35 respectively screwed onto a root portion of each of thebolts 32; andsprings 36 respectively disposed in a compressed state between each of the adjustingnuts 35 and themovable portion 33. Thebrake shoe 34 is formed integrally with themovable portion 33 so as to coverhead portions 32a of thebolts 32. Themovable portion 33 is placed in a state of contact with thehead portions 32a of thebolts 32 by the force of thesprings 36. - The
base portion 31 of thisbraking mechanism portion 30 is mounted to theframe 18 so as to be pivotable about ashaft 38 parallel to theaxle 19, thebraking mechanism portion 30 adopting: a standby position in which thebrake shoe 34 is separated from an innercircumferential wall surface 28e of theouter ring 28c of thedrive sheave 28; and a braking position in which thebraking mechanism portion 30 is placed in contact with astopper 37 disposed so as to stand upright on theframe 18 and thebrake shoe 34 is placed in contact with the innercircumferential wall surface 28e of theouter ring 28c of thedrive sheave 28. Here, the shaft 38 (a first shaft) is disposed inside thedrive sheave 28 on a like side as thedeflector sheave 29 relative to an up-down line (a vertical line) passing through a central axis of theaxle 19 in Figure 2 and in a region between a left-right line (a horizontal line) passing through the central axis of theaxle 19 and the perpendicular line so as to enable the standby position and the braking position to be adopted. - The
activating mechanism portion 40 is constituted by: asolenoid coil 41; and aplunger 42 composed of a magnetic material. This activatingmechanism portion 40 is mounted to theframe 18 such that the direction of movement of theplunger 42 is vertical, a projecting end of theplunger 42 being linked to themovable portion 33 so as to be pivotable around ashaft 44 parallel to theshaft 38. - In an
emergency braking apparatus 100 constructed in this manner, when an electric current is passed through thesolenoid coil 41, theplunger 42 is magnetically attracted and retracts (moves upward in Figure 2), stopping when astopper 42a comes into contact with a main body portion of thesolenoid coil 41. The retracting force of thisplunger 42 is transmitted to the brakingmember 30 by means of themovable portion 33, and the brakingmember 30 pivots around theshaft 38 counterclockwise in Figure 2. This brakingmember 30, as shown in Figure 2, is maintained in the standby position by thestopper 42a being placed in contact with the main body portion of thesolenoid coil 41. - Next, when a state in which the ascent velocity of the
car 23 exceeds a rated velocity is detected by a speed governor, etc., the passage of electric current to thesolenoid coil 41 is stopped. Thus, the magnetic attraction that was acting on theplunger 42 is removed, and thebraking mechanism portion 30 pivots around theshaft 38 clockwise in Figure 2 under its own weight. Thebraking mechanism portion 30 pivots until thebrake shoe 34 comes into contact with' the innercircumferential wall surface 28e of theouter ring 28c of thedrive sheave 28. Thereafter, thebraking mechanism portion 30 moves toward thebase portion 31 together with the rotation of the drive sheave 28 (clockwise in Figure 2) such that themovable portion 33 is guided by thebolts 32, pivots further while compressing thesprings 36, and stops when placed in contact with thestopper 37, assuming the braking position shown in Figure 3. Then, a pressing force resulting from the compression of thesprings 36 acts on the innercircumferential wall surface 28e by means of thebrake shoe 34, generating a braking force between thebrake shoe 34 and the innercircumferential wall surface 28e, and thecar 23 is decelerated or stopped. - If the elevator is restored to a normal state, an electric current is passed through the
solenoid coil 41. Thus, theplunger 42 is magnetically attracted and thebraking mechanism portion 30 pivots around theshaft 38 counterclockwise in Figure 3, returning thebraking mechanism portion 30 to the standby position. - Thus, an
emergency braking apparatus 100 according toEmbodiment 1 functions as an ascent safety apparatus capable of operating swiftly to perform deceleration or stopping of thecar 23 when the ascent velocity of thecar 23 exceeds a rated velocity. Thus, the occurrence of accidents in which passengers may be injured due to thecounterweight 25 colliding with the buffers at greater than or equal to the design velocity as a result of the ascent being greater than or equal to the rated velocity of thecar 23 can be prevented in advance. - In this
emergency braking apparatus 100, because thebraking mechanism portion 30 and the activatingmechanism portion 40 are disposed inside thedrive sheave 28, installation space for the apparatus can be conserved. Because the braking force is generated by pushing thebrake shoe 34 against the innercircumferential wall surface 28e of theouter ring 28c of thedrive sheave 28, there is no damage to the guide rails 24 and 25 or themain rope 27, making it extremely economical. - In this
emergency braking apparatus 100, because the amount of pivoting from the standby position of thebraking mechanism portion 30 to the braking position is constant, the amount of compression in thesprings 36 is also constant, enabling the ascendingcar 23 to be decelerated or stopped by a constant braking force irrespective of velocity. Because adjusting nuts 35 are provided, if the adjustingnuts 35 are adjusted so that the amount of compression in thesprings 36 is increased at the standby position, the pressing force of thebrake shoe 34 on the innercircumferential wall surface 28e during braking can be increased. In other words, the braking force can be adjusted arbitrarily. In addition, because the direction of rotation during activation of thebraking mechanism portion 30 matches the direction of rotation of thedrive sheave 28, the braking function is reliably exhibited by thebrake shoe 34 cutting into the innercircumferential wall surface 28e in a wedging effect, thereby improving the safety level. - In this
emergency braking apparatus 100, because thebraking mechanism portion 30 adopts the braking position swiftly under its own weight by stopping the passage of electric current to thesolenoid coil 41, time lag from activation to the commencement of braking can be shortened, enabling increases in the velocity of thecar 23 resulting from the time lag from activation to the commencement of braking also to be suppressed. - In this
emergency braking apparatus 100, because thebraking mechanism portion 30 can be returned from the braking position to the standby position by passing an electric current to thesolenoid coil 41, a manual operation for resetting the emergency braking apparatus is also no longer necessary. Thus, because theemergency braking apparatus 100 can be activated repeatedly, theemergency braking apparatus 100 can also be activated when thecar 23 is at a floor to stop rotation of thedrive sheave 28. Thus, sudden abnormal ascent of thecar 23 while passengers are boarding and leaving is reliably prevented, further increasing the safety level. - Because the
emergency braking apparatus 100 is constituted by abraking mechanism portion 30 including abase portion 31, a pair ofbolts 32 disposed so as to stand on thebase portion 31, amovable portion 33 movably disposed along shafts of thebolts 32 so as to be guided by thebolts 32, and having abrake shoe 34 mounted integrally to a tip, and springs 36 for forcing themovable portion 33 towardhead portions 32a of thebolts 32; and an activatingmechanism portion 40 including asolenoid coil 41 and aplunger 42, the construction of the apparatus is simplified, enabling cost reductions. - In
Embodiment 1 above, theemergency braking apparatus 100 is disposed on a like side of a vertical line passing through theaxle 19 as adeflector sheave 29, but theemergency braking apparatus 100 may also be disposed on an opposite side of the vertical line passing through theaxle 19 from thedeflector sheave 29. In that case, theemergency braking apparatus 100 functions as a descent safety apparatus and theemergency braking apparatus 100 operates swiftly to decelerate or stop thecar 23 if abnormal velocity of thecar 23 in a downward direction is detected. In addition, when thecar 23 is at a floor, sudden dropping of the car while passengers are boarding and leaving can be prevented by operating theemergency braking apparatus 100 to prevent rotation of thedrive sheave 23 that gives rise to the dropping of thecar 23. - Figure 5 is an enlarged partial side elevation showing a standby state of an emergency braking apparatus according to
Embodiment 2 of the present invention. - In
Embodiment 2, as shown in Figure 5, in a firstemergency braking apparatus 100, abraking mechanism portion 30 mounted so as to be pivotable around a shaft 38 (a first shaft) is disposed inside adrive sheave 28 and a braking position on a like side of a vertical line passing through a central axis of anaxle 19 as adeflector sheave 29 and in a region between a horizontal line and the vertical line passing through the central axis of theaxle 19 so as to adopt a standby position, and in a secondemergency braking apparatus 100, abraking mechanism portion 30 mounted so as to be pivotable around a shaft 38 (a second shaft) is disposed inside thedrive sheave 28 on an opposite side of the vertical line passing through the central axis of theaxle 19 from thedeflector sheave 29 and in a region between a horizontal line and the vertical line passing through the central axis of theaxle 19 so as to adopt a standby position and a braking position. The twoemergency braking apparatuses 100 are disposed symmetrically relative to the vertical line passing through theaxle 19. - According to
Embodiment 2, during normal operation of thecar 23, an electric current is passed through the solenoid coils 41 of both of theemergency braking apparatuses 100 to maintain them in the standby position. - When a state in which the ascent velocity of the car exceeds a rated velocity is detected by a speed governor, etc., the passage of electric current to the
solenoid coil 41 of the firstemergency braking apparatus 100 is stopped, thebraking mechanism portion 30 assumes the braking position, generating a braking force between thebrake shoe 34 and the innercircumferential wall surface 28e, and thecar 23 is decelerated or stopped. If the elevator is restored to a normal state, an electric current is passed through thesolenoid coil 41, returning thebraking mechanism portion 30 to the standby position. - Similarly, when a state in which the descent velocity of the car exceeds a rated velocity is detected by a speed governor, etc., the passage of electric current to the
solenoid coil 41 of the secondemergency braking apparatus 100 is stopped, thebraking mechanism portion 30 assumes the braking position, generating a braking force between thebrake shoe 34 and the innercircumferential wall surface 28e, and thecar 23 is decelerated or stopped. If the elevator is restored to a normal state, an electric current is passed through thesolenoid coil 41, returning thebraking mechanism portion 30 to the standby position. - When the
car 23 arrives at a floor, the passage of electric current to the solenoid coils 41 of both of theemergency braking apparatuses 100 is stopped, and thebraking mechanism portions 30 of both of theemergency braking apparatuses 100 assume the braking position. Then, when passengers have finished boarding and leaving and a destination button is pressed, an electric current is passed through the solenoid coils 41 of both of theemergency braking apparatuses 100, and thebraking mechanism portions 30 of both of theemergency braking apparatuses 100 assume the standby position. Thereafter, raising or lowering of thecar 23 is performed. - Consequently, in
Embodiment 2, because twoemergency braking apparatuses 100 are deployed, and the firstemergency braking apparatus 100 functions as an ascent safety apparatus, and the secondemergency braking apparatus 100 functions as a descent safety apparatus, if abnormal upward or downward velocity of thecar 23 is detected, theemergency braking apparatus 100 operates swiftly to decelerate or stop thecar 23, improving the safety level. - Because the two
emergency braking apparatuses 100 are operated when thecar 23 is at a floor in order to prevent rotation of thedrive sheave 23 that gives rise to rising and dropping of thecar 23, sudden rising and dropping of the car can be prevented while passengers are boarding and leaving, raising the safety level. - In an unbalanced state at an intermediate floor with no load, dismantling and maintenance of the brake of the hoisting
machine 22 are possible if the twoemergency braking apparatuses 100 are operated to prevent rotation of thedrive sheave 23 that gives rise to rising and dropping of thecar 23. - Now, in
Embodiment 2, the twoemergency braking apparatuses 100 are disposed symmetrically relative to a vertical line passing through theaxle 19, but it is not absolutely necessary for the twoemergency braking apparatuses 100 to be disposed symmetrically relative to the vertical line passing through theaxle 19; it is only necessary for thebraking mechanism portion 30 of each of theemergency braking apparatuses 100 to be disposed so as to be able to adopt the standby position and the braking position. - Moreover, in each of the above Embodiments, when the passage of electric current to the
solenoid coil 41 of anemergency braking apparatus 100 is stopped, thebraking mechanism portion 30 is set to the braking position by pivoting around theshaft 38 under its own weight, but the activatingmechanism portion 40 may also be equipped with a spring for forcing theplunger 42 toward thebraking mechanism portion 30, and when the passage of electric current to thesolenoid coil 41 is stopped, theplunger 42 is moved by the force of the spring, thebraking mechanism portion 30 thereby being set to the braking position by pivoting around theshaft 38. In that case, the amount of time from activation to the commencement of braking is shortened, enabling increases in the velocity of thecar 23 resulting from the time lag from activation to the commencement of braking to be further suppressed. - In each of the above Embodiments, the
plunger 42 and themovable portion 33 are linked so as to be pivotable about theshaft 44, but theplunger 42 and themovable portion 33 may also be linked by a universal joint. In that case, the transmission of force between theplunger 42 and themovable portion 33 is smooth, and it is no longer necessary to ensure the installation position of the activatingmechanism portion 40 with high precision, facilitating assembly of theemergency braking apparatus 100. - In each of the above Embodiments, the
emergency braking apparatus 100 is installed in thedrive sheave 28, but similar effects can also be achieved if theemergency braking apparatus 100 is installed in thedeflector sheave 29.
Claims (8)
- An elevator emergency braking apparatus for performing braking of an elevator in which a car is suspended at a first end of a main rope wound around an outer ring of a sheave and a counterweight is suspended at a second end of said main rope, said elevator emergency braking apparatus comprising:a first braking mechanism portion mounted inside said sheave so as to be pivotable around a first shaft parallel to an axle of said sheave and so as to be positioned on a like side as said counterweight relative to a vertical line passing through said axle, and being provided with a first brake shoe at an opposite end from said first shaft, said first braking mechanism portion adopting a first standby position in which said first brake shoe is separated from an inner circumferential wall surface of said outer ring of said sheave and a first braking position in which said first brake shoe contacts said inner circumferential wall surface of said outer ring; anda first activating mechanism portion for maintaining said first braking mechanism portion in said first standby position when not braking and maintaining said first braking mechanism portion in said first braking position when braking.
- The elevator emergency braking apparatus according to Claim 1, wherein:said first braking mechanism portion comprises:a first base portion pivotally supported by said first shaft;a first guide member disposed so as to extend from said first base portion on an opposite side from said first shaft;a first movable portion movably disposed so as to be guided by said first guide member, said first movable portion having said first brake shoe mounted to an opposite end from said first shaft; anda first spring for forcing said first movable portion away from said first shaft.
- The elevator emergency braking apparatus according to Claim 1, further comprising:a second braking mechanism portion mounted inside said sheave so as to be pivotable around a second shaft parallel to said axle of said sheave and so as to be positioned on a like side as said car relative to a vertical line passing through said axle, and being provided with a second brake shoe at an opposite end from said second shaft, said second braking mechanism portion adopting a second standby position in which said second brake shoe is separated from said inner circumferential wall surface of said outer ring of said sheave and a second braking position in which said second brake shoe contacts said inner circumferential wall surface of said outer ring; anda second activating mechanism portion for maintaining said second braking mechanism portion in said second standby position when not braking and maintaining said second braking mechanism portion in said second braking position when braking.
- The elevator emergency braking apparatus according to Claim 3, wherein:said second braking mechanism portion comprises:a second base portion pivotally supported by said second shaft;a second guide member disposed so as to extend from said second base portion on an opposite side from said second shaft;a second movable portion movably disposed so as to be guided by said second guide member, said second movable portion having said second brake shoe mounted to an opposite end from said second shaft; anda second spring for forcing said second movable portion away from said second shaft.
- An elevator emergency braking apparatus for performing braking of an elevator in which a car is suspended at a first end of a main rope wound around an outer ring of a sheave and a counterweight is suspended at a second end of said main rope, said elevator emergency braking apparatus comprising:a braking mechanism portion mounted inside said sheave so as to be pivotable around a second shaft parallel to an axle of said sheave and so as to be positioned on a like side as said car relative to a vertical line passing through said axle, and being provided with a brake shoe at an opposite end from said second shaft, said braking mechanism portion adopting a standby position in which said brake shoe is separated from an inner circumferential wall surface of said outer ring of said sheave and a braking position in which said brake shoe contacts said inner circumferential wall surface of said outer ring; andan activating mechanism portion for maintaining said braking mechanism portion in said standby position when not braking and maintaining said braking mechanism portion in said braking position when braking.
- The elevator emergency braking apparatus according to Claim 5, wherein:said braking mechanism portion comprises:a base portion pivotally supported by said second shaft;a guide member disposed so as to extend from said base portion on an opposite side from said second shaft;a movable portion movably disposed so as to be guided by said guide member, said movable portion having said brake shoe mounted to an opposite end from said second shaft; anda spring for forcing said movable portion away from said second shaft.
- The elevator emergency braking apparatus according to any of Claims 1 to 6, wherein:said sheave is a drive sheave of a hoisting machine.
- The elevator emergency braking apparatus according to any of Claims 1 to 6, wherein:said sheave is a deflector sheave.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2002/003935 WO2003089354A1 (en) | 2002-04-19 | 2002-04-19 | Emergency brake device for elevator |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1498380A1 true EP1498380A1 (en) | 2005-01-19 |
EP1498380A4 EP1498380A4 (en) | 2011-01-05 |
Family
ID=29227607
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02720525A Withdrawn EP1498380A4 (en) | 2002-04-19 | 2002-04-19 | Emergency brake device for elevator |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1498380A4 (en) |
JP (1) | JP4115396B2 (en) |
KR (1) | KR100614145B1 (en) |
CN (1) | CN1305748C (en) |
WO (1) | WO2003089354A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1724228A1 (en) * | 2004-02-16 | 2006-11-22 | Mitsubishi Denki K.K. | Brake device for elevator hoist |
EP1783089A4 (en) * | 2004-08-27 | 2012-09-19 | Mitsubishi Electric Corp | Hoist of elevator |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100447068C (en) * | 2004-02-23 | 2008-12-31 | 三菱电机株式会社 | Emergency brake device of elevator |
CN1845870B (en) * | 2004-06-14 | 2010-04-28 | 三菱电机株式会社 | Emergency braking device for elevator |
CN100408460C (en) * | 2004-07-22 | 2008-08-06 | 上海三菱电梯有限公司 | Apparatus for protecting lifting overspeed of elevator |
JP4904012B2 (en) * | 2005-04-08 | 2012-03-28 | 東芝エレベータ株式会社 | Rope brake device for elevator |
KR101698833B1 (en) | 2015-06-20 | 2017-01-24 | 윤호원 | Platform means having an emergency stop of the elevator |
CN105217402A (en) * | 2015-11-09 | 2016-01-06 | 苏州博量传动设备有限公司 | Prevent brake equipment and the method for elevator accidental movement |
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US4739969A (en) * | 1985-11-04 | 1988-04-26 | Johns Perry Industries Pty. Ltd. | Lift sheave |
US5018603A (en) * | 1988-08-26 | 1991-05-28 | Mitsubishi Denki Kabushiki Kaisha | Elevator hoist apparatus |
EP1043261A2 (en) * | 1999-04-05 | 2000-10-11 | Mitsubishi Denki Kabushiki Kaisha | Elevator traction machine |
EP1078876A2 (en) * | 1999-08-26 | 2001-02-28 | Mitsubishi Denki Kabushiki Kaisha | Elevator system having an improved hoisting machine |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS59183469U (en) * | 1983-05-25 | 1984-12-06 | 三菱電機株式会社 | Elevator main rope slip reduction device |
JPH082818A (en) * | 1994-06-13 | 1996-01-09 | Murata Mach Ltd | Fly waste recovery device |
JP3551983B2 (en) * | 1994-06-20 | 2004-08-11 | 清水建設株式会社 | Two-link governor device |
FI109788B (en) * | 1998-06-08 | 2002-10-15 | Kone Corp | Traction wheel lift brake |
JP2001355659A (en) * | 2000-04-27 | 2001-12-26 | Inventio Ag | Disc brake for elevator driving device |
KR100483661B1 (en) * | 2001-09-28 | 2005-04-19 | 미쓰비시덴키 가부시키가이샤 | Brake controller of elevator |
-
2002
- 2002-04-19 KR KR1020047000246A patent/KR100614145B1/en not_active IP Right Cessation
- 2002-04-19 EP EP02720525A patent/EP1498380A4/en not_active Withdrawn
- 2002-04-19 WO PCT/JP2002/003935 patent/WO2003089354A1/en active Application Filing
- 2002-04-19 CN CNB028145135A patent/CN1305748C/en not_active Expired - Fee Related
- 2002-04-19 JP JP2003586079A patent/JP4115396B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US4739969A (en) * | 1985-11-04 | 1988-04-26 | Johns Perry Industries Pty. Ltd. | Lift sheave |
US5018603A (en) * | 1988-08-26 | 1991-05-28 | Mitsubishi Denki Kabushiki Kaisha | Elevator hoist apparatus |
EP1043261A2 (en) * | 1999-04-05 | 2000-10-11 | Mitsubishi Denki Kabushiki Kaisha | Elevator traction machine |
EP1078876A2 (en) * | 1999-08-26 | 2001-02-28 | Mitsubishi Denki Kabushiki Kaisha | Elevator system having an improved hoisting machine |
Non-Patent Citations (1)
Title |
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See also references of WO03089354A1 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1724228A1 (en) * | 2004-02-16 | 2006-11-22 | Mitsubishi Denki K.K. | Brake device for elevator hoist |
EP1724228A4 (en) * | 2004-02-16 | 2012-02-22 | Mitsubishi Electric Corp | Brake device for elevator hoist |
EP1783089A4 (en) * | 2004-08-27 | 2012-09-19 | Mitsubishi Electric Corp | Hoist of elevator |
Also Published As
Publication number | Publication date |
---|---|
JP4115396B2 (en) | 2008-07-09 |
EP1498380A4 (en) | 2011-01-05 |
KR100614145B1 (en) | 2006-08-21 |
KR20040016974A (en) | 2004-02-25 |
WO2003089354A1 (en) | 2003-10-30 |
CN1533355A (en) | 2004-09-29 |
CN1305748C (en) | 2007-03-21 |
JPWO2003089354A1 (en) | 2005-08-25 |
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