EP1741657A1

EP1741657A1 - Elevator apparatus

Info

Publication number: EP1741657A1
Application number: EP04730713A
Authority: EP
Inventors: Daiki Fukui; Takashi Yumura; Kazumasa Ito
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2004-04-30
Filing date: 2004-04-30
Publication date: 2007-01-10
Anticipated expiration: 2024-04-30
Also published as: EP1741657A4; DE602004031265D1; EP1741657B1; JP4292204B2; CN1780780A; CN1780780B; WO2005105648A1; JPWO2005105648A1

Abstract

In an elevator apparatus, a car and a counterweight are suspended within a hoistway according to a 2:1 roping method by means of a main rope. The main rope has a car-side end portion and a counterweight-side end portion connected to an upper portion of the hoistway. A car oscillation detector for detecting oscillation of the car-side end portion is provided in the upper portion of the hoistway. A mischief detecting portion detects mischief-related car oscillation according to a signal from the car oscillation detector.

Description

TECHNICAL FIELD

The present invention relates to an elevator apparatus capable of detecting mischief-related car oscillation and preventing erroneous detection of excess speed.

BACKGROUND ART

In a conventional elevator apparatus disclosed in JP HEI 9-202560 A , for example, an oscillation detecting body for detecting oscillation of a magnitude equal to or larger than a set value is provided in an elevator car. For example, when the car oscillates due to mischief, the oscillation detecting body detects the oscillation, and a warning device issues a warning. Thus, mischief-related car oscillation is transferred to a speed governor, so that the speed governor is prevented from malfunctioning.
However, the level of car oscillation affecting the speed governor via a speed governor rope is different from the level of car oscillation directly detected by the oscillation detecting body. Therefore, even in the event of car oscillation whose level is much lower than a level causing malfunction of the speed governor, a warning is likely to be issued.
Further, since it is unclear which magnitude of car oscillation triggers malfunction of the speed governor, it is necessary for the level for detecting mischief to be set low. As a result, warnings may be frequently issued due to erroneous detection.

DISCLOSURE OF THE INVENTION

The present invention has been made to solve the problem mentioned above, and has an object to obtain an elevator apparatus capable of preventing more reliably erroneous detection of excess speed from occurring due to mischief-related car oscillation and of preventing erroneous detection of mischief.
To this end, according to one aspect of the present invention, there is provided an elevator apparatus comprising: a car that is mounted with car suspending pulleys and raised and lowered within a hoistway; a counterweight that is mounted with a counterweight suspending pulley and raised and lowered within the hoistway; a driving device that has a drive sheave and raises and lowers the car and the counterweight; a main rope that has a car-side end portion and a counterweight-side end portion connected to an upper portion of the hoistway, and is wound around the car suspending pulleys, the counterweight suspending pulley, and the drive sheave; a speed governor that has a speed governor sheave rotated at a speed corresponding to a traveling speed of the car, and is provided in the upper portion of the hoistway; a speed governor rope that is wound around the speed governor sheave and connected to the car; an elevator control portion that detects a traveling speed of the car from a rotation of the speed governor sheave, and controls operation of the car according to a detection result; a car oscillation detector that is provided in the upper portion of the hoistway, and serves to detect oscillation of the car-side end portion; and a mischief detecting portion that detects mischief-related car oscillation according to a signal from the car oscillation detector.
According to another aspect of the present invention, there is provided an elevator apparatus comprising: a driving device that has a drive sheave; a main rope that is wound around the drive sheave; a car that is suspended within a hoistway by means of the main rope and raised and lowered by the driving device; a speed governor that has a speed governor sheave rotated at a speed corresponding to a traveling speed of the car; an elevator control portion that detects a traveling speed of the car from a rotation of the speed governor sheave and controls operation of the car according to a detection result; a speed governor oscillation detector for detecting oscillation of the speed governor; a car oscillation detector for detecting oscillation of the car; and a mischief detecting portion that detects mischief-related car oscillation according to signals from the speed governor oscillation detector and the car oscillation detector.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic diagram showing an elevator apparatus according to Embodiment 1 of the present invention.
Fig. 2 is a front view showing the safety device of Fig. 1.
Fig. 3 is a front view showing the safety device of Fig. 2 that has been actuated.
Fig. 4 is a schematic diagram showing an elevator apparatus according to Embodiment 2 of the present invention.
Fig. 5 is a front view showing the safety device of Fig. 4.
Fig. 6 is a front view showing the safety device of Fig. 5 that has been actuated.
Fig. 7 is a front view showing the drive portion of Fig. 6.
Fig. 8 is a schematic diagram showing an elevator apparatus according to Embodiment 3 of the present invention.
Fig. 9 is a schematic diagram showing an elevator apparatus according to Embodiment 4 of the present invention.
Fig. 10 is a schematic diagram showing an elevator apparatus according to Embodiment 5 of the present invention.
Fig. 11 is a schematic diagram showing an elevator apparatus according to Embodiment 6 of the present invention.
Fig. 12 is a schematic diagram showing another example of the elevator apparatus shown in Fig. 11.
Fig. 13 is a schematic diagram showing an elevator apparatus according to Embodiment 7 of the present invention.
Fig. 14 is a schematic diagram showing an elevator apparatus according to Embodiment 8 of the present invention.
Fig. 15 is a front view showing another example of the drive portion shown in Fig. 7.
Fig. 16 is a plan view showing a safety device according to Embodiment 9 of the present invention.
Fig. 17 is a partially cutaway side view showing a safety device according to Embodiment 10 of the present invention.
Fig. 18 is a schematic diagram showing an elevator apparatus according to Embodiment 11 of the present invention.
Fig. 19 is a graph showing the car speed abnormality determination criteria stored in the memory portion of Fig. 18.
Fig. 20 is a graph showing the car acceleration abnormality determination criteria stored in the memory portion of Fig. 18.
Fig. 21 is a schematic diagram showing an elevator apparatus according to Embodiment 12 of the present invention.
Fig. 22 is a schematic diagram showing an elevator apparatus according to Embodiment 13 of the present invention.
Fig. 23 is a diagram showing the rope fastening device and the rope sensors of Fig. 22.
Fig. 24 is a diagram showing a state where one of the main ropes of Fig. 23 has broken.
Fig. 25 is a schematic diagram showing an elevator apparatus according to Embodiment 14 of the present invention.
Fig. 26 is a schematic diagram showing an elevator apparatus according to Embodiment 15 of the present invention.
Fig. 27 is a perspective view of the car and the door sensor of Fig. 26.
Fig. 28 is a perspective view showing a state in which the car entrance 26 of Fig. 27 is open.
Fig. 29 is a schematic diagram showing an elevator apparatus according to Embodiment 16 of the present invention.
Fig. 30 is a diagram showing an upper portion of the hoistway of Fig. 29.
Fig. 31 is a schematic diagram showing an elevator apparatus according to Embodiment 17 of the present invention.
Fig. 32 is a front view showing in an enlarged manner a neighboring region of an oscillation detector of Fig. 31.
Fig. 33 is a side view showing a neighboring region of the oscillation detector of Fig. 32.
Fig. 34 is a front view showing an essential part of an elevator apparatus according to Embodiment 18 of the present invention.
Fig. 35 is a schematic diagram showing an elevator apparatus according to Embodiment 19 of the present invention.
Fig. 36 is a schematic diagram showing an elevator apparatus according to Embodiment 20 of the present invention.
Fig. 37 is a schematic diagram showing an elevator apparatus according to Embodiment 21 of the present invention.
Fig. 38 is a flowchart showing operation of a mischief detecting portion of Fig. 37.
Fig. 39 is a schematic diagram showing an elevator apparatus according to Embodiment 22 of the present invention.
Fig. 40 is a side view showing an oscillation suppressor of Fig. 39.
Fig. 41 is an explanatory view showing signal correction by means of a filter of Fig. 39.
Fig. 42 is an explanatory view showing an example in which a detection signal from an oscillation detector is corrected in two different manners.

BEST MODE FOR CARRYING OUT THE INVENTION

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

Embodiment 1

Fig. 1 is a schematic diagram showing an elevator apparatus according to Embodiment 1 of the present invention. Referring to Fig. 1, a pair of car guide rails 2 are arranged within a hoistway 1. A car 3 is guided by the car guide rails 2 as it is raised and lowered in the hoistway 1. Arranged at the upper end portion of the hoistway 1 is a hoisting machine (not shown) for raising and lowering the car 3 and a counterweight (not shown). A main rope 4 is wound around a drive sheave of the hoisting machine. The car 3 and the counterweight are suspended in the hoistway 1 by means of the main rope 4. Mounted to the car 3 are a pair of safety devices 5 opposed to the respective guide rails 2 and serving as braking means. The safety devices 5 are arranged on the underside of the car 3. Braking is applied to the car 3 upon actuating the safety devices 5.
Also arranged at the upper end portion of the hoistway 1 is a governor 6 serving as a car speed detecting means for detecting the ascending/descending speed of the car 3. The governor 6 has a governor main body 7 and a governor sheave 8 rotatable with respect to the governor main body 7. A rotatable tension pulley 9 is arranged at a lower end portion of the hoistway 1. Wound between the governor sheave 8 and the tension pulley 9 is a governor rope 10 connected to the car 3. The connecting portion between the governor rope 10 and the car 3 undergoes vertical reciprocating motion as the car 3 travels. As a result, the governor sheave 8 and the tension pulley 9 are rotated at a speed corresponding to the ascending/descending speed of the car 3.
The governor 6 is adapted to actuate a braking device of the hoisting machine when the ascending/descending speed of the car 3 has reached a preset first overspeed. Further, the governor 6 is provided with a switch portion 11 serving as an output portion through which an actuation signal is output to the safety devices 5 when the descending speed of the car 3 reaches a second overspeed (set overspeed) higher than the first overspeed. The switch portion 11 has a contact 16 which is mechanically opened and closed by means of an overspeed lever that is displaced according to the centrifugal force of the rotating governor sheave 8. The contact 16 is electrically connected to a battery 12, which is an uninterruptible power supply capable of feeding power even in the event of a power failure, and to a control panel 13 that controls the drive of an elevator, through a power supply cable 14 and a connection cable 15, respectively.
A control cable (movable cable) is connected between the car 3 and the control panel 13. The control cable includes, in addition to multiple power lines and signal lines, an emergency stop wiring 17 electrically connected between the control panel 13 and each safety device 5. By closing of the contact 16, power from the battery 12 is supplied to each safety device 5 by way of the power supply cable 14, the switch portion 11, the connection cable 15, a power supply circuit within the control panel 13, and the emergency stop wiring 17. It should be noted that transmission means consists of the connection cable 15, the power supply circuit within the control panel 13, and the emergency stop wiring 17.
Fig. 2 is a front view showing the safety device 5 of Fig. 1, and Fig. 3 is a front view showing the safety device 5 of Fig. 2 that has been actuated. Referring to the figures, a support member 18 is fixed in position below the car 3. The safety device 5 is fixed to the support member 18. Further, each safety device 5 includes a pair of actuator portions 20, which are connected to a pair of wedges 19 serving as braking members and capable of moving into and away from contact with the car guide rail 2 to displace the wedges 19 with respect to the car 3, and a pair of guide portions 21 which are fixed to the support member 18 and guide the wedges 19 displaced by the actuator portions 20 into contact with the car guide rail 2. The pair of wedges 19, the pair of actuator portions 20, and the pair of guide portions 21 are each arranged symmetrically on both sides of the car guide rail 2.
Each guide portion 21 has an inclined surface 22 inclined with respect to the car guide rail 2 such that the distance between it and the car guide rail 2 decreases with increasing proximity to its upper portion. The wedge 19 is displaced along the inclined surface 22. Each actuator portion 20 includes a spring 23 serving as an urging portion that urges the wedge 19 upward toward the guide portion 21 side, and an electromagnet 24 which, when supplied with electric current, generates an electromagnetic force for displacing the wedge 19 downward away from the guide member 21 against the urging force of the spring 23.
The spring 23 is connected between the support member 18 and the wedge 19. The electromagnet 24 is fixed to the support member 18. The emergency stop wiring 17 is connected to the electromagnet 24. Fixed to each wedge 19 is a permanent magnet 25 opposed to the electromagnet 24. The supply of electric current to the electromagnet 24 is performed from the battery 12 (see Fig. 1) by the closing of the contact 16 (see Fig. 1). The safety device 5 is actuated as the supply of electric current to the electromagnet 24 is cut off by the opening of the contact 16 (see Fig. 1). That is, the pair of wedges 19 are displaced upward due to the elastic restoring force of the spring 23 to be pressed against the car guide rail 2.
Next, operation is described. The contact 16 remains closed during normal operation. Accordingly, power is supplied from the battery 12 to the electromagnet 24. The wedge 19 is attracted and held onto the electromagnet 24 by the electromagnetic force generated upon this power supply, and thus remains separated from the car guide rail 2 (Fig. 2).
When, for instance, the speed of the car 3 rises to reach the first overspeed due to a break in the main rope 4 or the like, this actuates the braking device of the hoisting machine. When the speed of the car 3 rises further even after the actuation of the braking device of the hoisting machine and reaches the second overspeed, this triggers closure of the contact 16. As a result, the supply of electric current to the electromagnet 24 of each safety device 5 is cut off, and the wedges 19 are displaced by the urging force of the springs 23 upward with respect to the car 3. At this time, the wedges 19 are displaced along the inclined surface 22 while in contact with the inclined surface 22 of the guide portions 21. Due to this displacement, the wedges 19 are pressed into contact with the car guide rail 2. The wedges 19 are displaced further upward as they come into contact with the car guide rail 2, to become wedged in between the car guide rail 2 and the guide portions 21. A large frictional force is thus generated between the car guide rail 2 and the wedges 19, braking the car 3 (Fig. 3).
To release the braking on the car 3, the car 3 is raised while supplying electric current to the electromagnet 24 by the closing of the contact 16. As a result, the wedges 19 are displaced downward, thus separating from the car guide rail 2.
In the above-described elevator apparatus, the switch portion 11 connected to the battery 12 and each safety device 5 are electrically connected to each other, whereby an abnormality in the speed of the car 3 detected by the governor 6 can be transmitted as an electrical actuation signal from the switch portion 11 to each safety device 5, making it possible to brake the car 3 in a short time after detecting an abnormality in the speed of the car 3. As a result, the braking distance of the car 3 can be reduced. Further, synchronized actuation of the respective safety devices 5 can be readily effected, making it possible to stop the car 3 in a stable manner. Also, each safety device 5 is actuated by the electrical actuation signal, thus preventing the safety device 5 from being erroneously actuated due to shaking of the car 3 or the like.
Additionally, each safety device 5 has the actuator portions 20 which displace the wedge 19 upward toward the guide portion 21 side, and the guide portions 21 each including the inclined surface 22 to guide the upwardly displaced wedge 19 into contact with the car guide rail 2, whereby the force with which the wedge 19 is pressed against the car guide rail 2 during descending movement of the car 3 can be increased with reliability.
Further, each actuator portion 20 has a spring 23 that urges the wedge 19 upward, and an electromagnet 24 for displacing the wedge 19 downward against the urging force of the spring 23, thereby enabling displacement of the wedge 19 by means of a simple construction.

Embodiment 2

Fig. 4 is a schematic diagram showing an elevator apparatus according to Embodiment 2 of the present invention. Referring to Fig. 4, the car 3 has a car main body 27 provided with a car entrance 26, and a car door 28 that opens and closes the car entrance 26. Provided in the hoistway 1 is a car speed sensor 31 serving as car speed detecting means for detecting the speed of the car 3. Mounted inside the control panel 13 is an output portion 32 electrically connected to the car speed sensor 31. The battery 12 is connected to the output portion 32 through the power supply cable 14. Electric power used for detecting the speed of the car 3 is supplied from the output portion 32 to the car speed sensor 31. The output portion 32 is input with a speed detection signal from the car speed sensor 31.
Mounted on the underside of the car 3 are a pair of safety devices 33 serving as braking means for braking the car 3. The output portion 32 and each safety device 33 are electrically connected to each other through the emergency stop wiring 17. When the speed of the car 3 is at the second overspeed, an actuation signal, which is the actuating power, is output to each safety device 33. The safety devices 33 are actuated upon input of this actuation signal.
Fig. 5 is a front view showing the safety device 33 of Fig. 4, and Fig. 6 is a front view showing the safety device 33 of Fig. 5 that has been actuated. Referring to the figures, the safety device 33 has a wedge 34 serving as a braking member and capable of moving into and away from contact with the car guide rail 2, an actuator portion 35 connected to a lower portion of the wedge 34, and a guide portion 36 arranged above the wedge 34 and fixed to the car 3. The wedge 34 and the actuator portion 35 are capable of vertical movement with respect to the guide portion 36. As the wedge 34 is displaced upward with respect to the guide portion 36, that is, toward the guide portion 36 side, the wedge 34 is guided by the guide portion 36 into contact with the car guide rail 2.
The actuator portion 35 has a cylindrical contact portion 37 capable of moving into and away from contact with the car guide rail 2, an actuating mechanism 38 for displacing the contact portion 37 into and away from contact with the car guide rail 2, and a support portion 39 supporting the contact portion 37 and the actuating mechanism 38. The contact portion 37 is lighter than the wedge 34 so that it can be readily displaced by the actuating mechanism 38. The actuating mechanism 38 has a movable portion 40 capable of reciprocating displacement between a contact position where the contact portion 37 is held in contact with the car guide rail 2 and a separated position where the contact portion 37 is separated from the car guide rail 2, and a drive portion 41 for displacing the movable portion 40.
The support portion 39 and the movable portion 40 are provided with a support guide hole 42 and a movable guide hole 43, respectively. The inclination angles of the support guide hole 42 and the movable guide hole 43 with respect to the car guide rail 2 are different from each other. The contact portion 37 is slidably fitted in the support guide hole 42 and the movable guide hole 43. The contact portion 37 slides within the movable guide hole 43 according to the reciprocating displacement of the movable portion 40, and is displaced along the longitudinal direction of the support guide hole 42. As a result, the contact portion 37 is moved into and away from contact with the car guide rail 2 at an appropriate angle. When the contact portion 37 comes into contact with the car guide rail 2 as the car 3 descends, braking is applied to the wedge 34 and the actuator portion 35, displacing them toward the guide portion 36 side.
Mounted on the upperside of the support portion 39 is a horizontal guide hole 47 extending in the horizontal direction. The wedge 34 is slidably fitted in the horizontal guide hole 47. That is, the wedge 34 is capable of reciprocating displacement in the horizontal direction with respect to the support portion 39.
The guide portion 36 has an inclined surface 44 and a contact surface 45 which are arranged so as to sandwich the car guide rail 2 therebetween. The inclined surface 44 is inclined with respect to the car guide rail 2 such that the distance between it and the car guide rail 2 decreases with increasing proximity to its upper portion. The contact surface 45 is capable of moving into and away from contact with the car guide rail 2. As the wedge 34 and the actuator portion 35 are displaced upward with respect to the guide portion 36, the wedge 34 is displaced along the inclined surface 44. As a result, the wedge 34 and the contact surface 45 are displaced so as to approach each other, and the car guide rail 2 becomes lodged between the wedge 34 and the contact surface 45.
Fig. 7 is a front view showing the drive portion 41 of Fig. 6. Referring to Fig. 7, the drive portion 41 has a disc spring 46 serving as an urging portion and attached to the movable portion 40, and an electromagnet 48 for displacing the movable portion 40 by an electromagnetic force generated upon supply of electric current thereto.
The movable portion 40 is fixed to the central portion of the disc spring 46. The disc spring 46 is deformed due to the reciprocating displacement of the movable portion 40. As the disc spring 46 is deformed due to the displacement of the movable portion 40, the urging direction of the disc spring 46 is reversed between the contact position (solid line) and the separated position (broken line). The movable portion 40 is retained at the contact or separated position as it is urged by the disc spring 46. That is, the contact or separated state of the contact portion 37 with respect to the car guide rail 2 is retained by the urging of the disc spring 46.
The electromagnet 48 has a first electromagnetic portion 49 fixed to the movable portion 40, and a second electromagnetic portion 50 opposed to the first electromagnetic portion 49. The movable portion 40 is displaceable relative to the second electromagnetic portion 50. The emergency stop wiring 17 is connected to the electromagnet 48. Upon inputting an actuation signal to the electromagnet 48, the first electromagnetic portion 49 and the second electromagnetic portion 50 generate electromagnetic forces so as to repel each other. That is, upon input of the actuation signal to the electromagnet 48, the first electromagnetic portion 49 is displaced away from contact with the second electromagnetic portion 50, together with the movable portion 40.
It should be noted that for recovery after the actuation of the safety device 5, the output portion 32 outputs a recovery signal during the recovery phase. Input of the recovery signal to the electromagnet 48 causes the first electromagnetic portion 49 and the second electromagnetic portion 50 to attract each other. Otherwise, this embodiment is of the same construction as Embodiment 1.
Next, operation is described. During normal operation, the movable portion 40 is located at the separated position, and the contact portion 37 is urged by the disc spring 46 to be separated away from contact with the car guide rail 2. With the contact portion 37 thus being separated from the car guide rail 2, the wedge 34 is separated from the guide portion 36, thus maintaining the distance between the wedge 34 and the guide portion 36.
When the speed detected by the car speed sensor 31 reaches the first overspeed, this actuates the braking device of the hoisting machine. When the speed of the car 3 continues to rise thereafter and the speed as detected by the car speed sensor 31 reaches the second overspeed, an actuation signal is output from the output portion 32 to each safety device 33. Inputting this actuation signal to the electromagnet 48 triggers the first electromagnetic portion 49 and the second electromagnetic portion 50 to repel each other. The electromagnetic repulsion force thus generated causes the movable portion 40 to be displaced into the contact position. As this happens, the contact portion 37 is displaced into contact with the car guide rail 2. By the time the movable portion 40 reaches the contact position, the urging direction of the disc spring 46 reverses to that for retaining the movable portion 40 at the contact position. As a result, the contact portion 37 is pressed into contact with the car guide rail 2, thus braking the wedge 34 and the actuator portion 35.
Since the car 3 and the guide portion 36 descend with no braking applied thereon, the guide portion 36 is displaced downward towards the wedge 34 and actuator 35 side. Due to this displacement, the wedge 34 is guided along the inclined surface 44, causing the car guide rail 2 to become lodged between the wedge 34 and the contact surface 45. As the wedge 34 comes into contact with the car guide rail 2, it is displaced further upward to wedge in between the car guide rail 2 and the inclined surface 44. A large frictional force is thus generated between the car guide rail 2 and the wedge 34, and between the car guide rail 2 and the contact surface 45, thus braking the car 3.
During the recovery phase, the recovery signal is transmitted from the output portion 32 to the electromagnet 48. This causes the first electromagnetic portion 49 and the second electromagnetic portion 50 to attract each other, thus displacing the movable portion 40 to the separated position. As this happens, the contact portion 37 is displaced to be separated away from contact with the car guide rail 2. By the time the movable portion 40 reaches the separated position, the urging direction of the disc spring 46 reverses, allowing the movable portion 40 to be retained at the separated position. As the car 3 ascends in this state, the pressing contact of the wedge 34 and the contact surface 45 with the car guide rail 2 is released.
In addition to providing the same effects as those of Embodiment 1, the above-described elevator apparatus includes the car speed sensor 31 provided in the hoistway 1 to detect the speed of the car 3. There is thereby no need to use a speed governor and a governor rope, making it possible to reduce the overall installation space for the elevator apparatus.
Further, the actuator portion 35 has the contact portion 37 capable of moving into and away from contact with the car guide rail 2, and the actuating mechanism 38 for displacing the contact portion 37 into and away from contact with the car guide rail 2. Accordingly, by making the weight of the contact portion 37 smaller than that of the wedge 34, the drive force to be applied from the actuating mechanism 38 to the contact portion 37 can be reduced, thus making it possible to miniaturize the actuating mechanism 38. Further, the lightweight construction of the contact portion 37 allows increases in the displacement rate of the contact portion 37, thereby reducing the time required until generation of a braking force.
Further, the drive portion 41 includes the disc spring 4 6 adapted to hold the movable portion 4 0 at the contact position or the separated position, and the electromagnet 48 capable of displacing the movable portion 40 when supplied with electric current, whereby the movable portion 40 can be reliably held at the contact or separated position by supplying electric current to the electromagnet 48 only during the displacement of the movable portion 40.

Embodiment 3

Fig. 8 is a schematic diagram showing an elevator apparatus according to Embodiment 3 of the present invention. Referring to Fig. 8, provided at the car entrance 26 is a door closed sensor 58, which serves as a door closed detecting means for detecting the open or closed state of the car door 28. An output portion 59 mounted on the control panel 13 is connected to the door closed sensor 58 through a control cable. Further, the car speed sensor 31 is electrically connected to the output portion 59. A speed detection signal from the car speed sensor 31 and an open/closed detection signal from the door closed sensor 58 are input to the output portion 59. On the basis of the speed detection signal and the open/closed detection signal thus input, the output portion 59 can determine the speed of the car 3 and the open or closed state of the car entrance 26.
The output portion 59 is connected to each safety device 33 through the emergency stop wiring 17. On the basis of the speed detection signal from the car speed sensor 31 and the opening/closing detection signal from the door closed sensor 58, the output portion 59 outputs an actuation signal when the car 3 has descended with the car entrance 26 being open. The actuation signal is transmitted to the safety device 33 through the emergency stop wiring 17. Otherwise, this embodiment is of the same construction as Embodiment 2.
In the elevator apparatus as described above, the car speed sensor 31 that detects the speed of the car 3, and the door closed sensor 58 that detects the open or closed state of the car door 28 are electrically connected to the output portion 59, and the actuation signal is output from the output portion 59 to the safety device 33 when the car 3 has descended with the car entrance 26 being open, thereby preventing the car 3 from descending with the car entrance 26 being open.
It should be noted that safety devices vertically reversed from the safety devices 33 may be mounted to the car 3. This construction alsomakes it possible to prevent the car 3 from ascending with the car entrance 26 being open.

Embodiment 4

Fig. 9 is a schematic diagram showing an elevator apparatus according to Embodiment 4 of the present invention. Referring to Fig. 9, passed through the main rope 4 is a break detection lead wire 61 serving as a rope break detecting means for detecting a break in the rope 4. A weak current flows through the break detection lead wire 61. The presence of a break in the main rope 4 is detected on the basis of the presence or absence of this weak electric current passing therethough. An output portion 62 mounted on the control panel 13 is electrically connected to the break detection lead wire 61. When the break detection lead wire 61 breaks, a rope break signal, which is an electric current cut-off signal of the break detection lead wire 61, is input to the output portion 62. The car speed sensor 31 is also electrically connected to the output portion 62.
The output portion 62 is connected to each safety device 33 through the emergency stop wiring 17. If the main rope 4 breaks, the output portion 62 outputs an actuation signal on the basis of the speed detection signal from the car speed sensor 31 and the rope break signal from the break detection lead wire 61. The actuation signal is transmitted to the safety device 33 through the emergency stop wiring 17. Otherwise, this embodiment is of the same construction as Embodiment 2.
In the elevator apparatus as described above, the car speed sensor 31 which detects the speed of the car 3 and the break detection lead wire 61 which detects a break in the main rope 4 are electrically connected to the output portion 62, and, when the main rope 4 breaks, the actuation signal is output from the output portion 62 to the safety device 33. By thus detecting the speed of the car 3 and detecting a break in the main rope 4, braking can be more reliably applied to a car 3 that is descending at abnormal speed.
While in the above example the method of detecting the presence or absence of an electric current passing through the break detection lead wire 61, which is passed through the main rope 4, is employed as the rope break detecting means, it is also possible to employ a method of, for example, measuring changes in the tension of the main rope 4. In this case, a tension measuring instrument is installed on the rope fastening.

Embodiment 5

Fig. 10 is a schematic diagram showing an elevator apparatus according to Embodiment 5 of the present invention. Referring to Fig. 10, provided in the hoistway 1 is a car position sensor 65 serving as car position detecting means for detecting the position of the car 3. The car position sensor 65 and the car speed sensor 31 are electrically connected to an output portion 66 mounted on the control panel 13. The output portion 66 has a memory portion 67 storing a control pattern containing information on the position, speed, acceleration/deceleration, floor stops, etc., of the car 3 during normal operation. Inputs to the output portion 66 are a speed detection signal from the car speed sensor 31 and a car position signal from the car position sensor 65.
The output portion 66 is connected to the safety device 33 through the emergency stop wiring 17. The output portion 66 compares the speed and position (actual measured values) of the car 3 based on the speed detection signal and the car position signal with the speed and position (set values) of the car 3 based on the control pattern stored in the memory portion 67. The output portion 66 outputs an actuation signal to the safety device 33 when the deviation between the actual measured values and the set values exceeds a predetermined threshold. Herein, the predetermined threshold refers to the minimum deviation between the actual measurement values and the set values required for bringing the car 3 to a halt through normal braking without the car 3 colliding against an end portion of the hoistway 1. Otherwise, this embodiment is of the same construction as Embodiment 2.
In the elevator apparatus as described above, the output portion 66 outputs the actuation signal when the deviation between the actual measurement values from each of the car speed sensor 31 and the car position sensor 65 and the set values based on the control pattern exceeds the predetermined threshold, making it possible to prevent collision of the car 3 against the end portion of the hoistway 1.

Embodiment 6

Fig. 11 is a schematic diagram showing an elevator apparatus according to Embodiment 6 of the present invention. Referring to Fig. 11, arranged within the hoistway 1 are an upper car 71 that is a first car and a lower car 72 that is a second car located below the upper car 71. The upper car 71 and the lower car 72 are guided by the car guide rail 2 as they ascend and descend in the hoistway 1. Installed at the upper end portion of the hoistway 1 are a first hoisting machine (not shown) for raising and lowering the upper car 71 and an upper-car counterweight (not shown), and a second hoisting machine (not shown) for raising and lowering the lower car 72 and a lower-car counterweight (not shown). A first main rope (not shown) is wound around the drive sheave of the first hoisting machine, and a second main rope (not shown) is wound around the drive sheave of the second hoisting machine. The upper car 71 and the upper-car counterweight are suspended by the first main rope, and the lower car 72 and the lower-car counterweight are suspended by the second main rope.
In the hoistway 1, there are provided an upper-car speed sensor 73 and a lower-car speed sensor 74 respectively serving as car speed detecting means for detecting the speed of the upper car 71 and the speed of the lower car 72. Also provided in the hoistway 1 are an upper-car position sensor 75 and a lower-car position sensor 76 respectively serving as car position detecting means for detecting the position of the upper car 71 and the position of the lower car 72.
It should be noted that car operation detecting means includes the upper-car speed sensor 73, the lower-car sped sensor 74, the upper-car position sensor 75, and the lower-car position sensor 76.
Mounted on the underside of the upper car 71 are upper-car safety devices 77 serving as braking means of the same construction as that of the safety devices 33 used in Embodiment 2. Mounted on the underside of the lower car 72 are lower-car safety devices 78 serving as braking means of the same construction as that of the upper-car safety devices 77.
An output portion 79 is mounted inside the control panel 13. The upper-car speed sensor 73, the lower-car speed sensor 74, the upper-car position sensor 75, and the lower-car position sensor 76 are electrically connected to the output portion 79. Further, the battery 12 is connected to the output portion 79 through the power supply cable 14. An upper-car speed detection signal from the upper-car speed sensor 73, a lower-car speed detection signal from the lower-car speed sensor 74, an upper-car position detecting signal from the upper-car position sensor 75, and a lower-car position detection signal from the lower-car position sensor 76 are input to the output portion 79. That is, information from the car operation detecting means is input to the output portion 79.
The output portion 79 is connected to the upper-car safety device 77 and the lower-car safety device 78 through the emergency stop wiring 17. Further, on the basis of the information from the car operation detecting means, the output portion 79 predicts whether or not the upper car 71 or the lower car 72 will collide against an end portion of the hoistway 1 and whether or not collision will occur between the upper car 71 and the lower car 72; when it is predicted that such collision will occur, the output portion 79 outputs an actuation signal to each the upper-car safety devices 77 and the lower-car safety devices 78. The upper-car safety devices 77 and the lower-car safety devices 78 are each actuated upon input of this actuation signal.
It should be noted that a monitoring portion includes the car operation detecting means and the output portion 79. The running states of the upper car 71 and the lower car 72 are monitored by the monitoring portion. Otherwise, this embodiment is of the same construction as Embodiment 2.
Next, operation is described. When input with the information from the car operation detecting means, the output portion 79 predicts whether or not the upper car 71 and the lower car 72 will collide against an end portion of the hoistway 1 and whether or not collision between the upper car and the lower car 72 will occur. For example, when the output portion 79 predicts that collision will occur between the upper car 71 and the lower car 72 due to a break in the first main rope suspending the upper car 71, the output portion 79 outputs an actuation signal to each the upper-car safety devices 77 and the lower-car safety devices 78. The upper-car safety devices 77 and the lower-car safety devices 78 are thus actuated, braking the upper car 71 and the lower car 72.
In the elevator apparatus as described above, the monitoring portion has the car operation detecting means for detecting the actual movements of the upper car 71 and the lower car 72 as they ascend and descend in the same hoistway 1, and the output portion 79 which predicts whether or not collision will occur between the upper car 71 and the lower car 72 on the basis of the information from the car operation detecting means and, when it is predicted that the collision will occur, outputs the actuation signal to each of the upper-car safety devices 77 and the lower-car emergency devices 78. Accordingly, even when the respective speeds of the upper car 71 and the lower car 72 have not reached the set overspeed, the upper-car safety devices 77 and the lower-car emergency devices 78 can be actuated when it is predicted that collision will occur between the upper car 71 and the lower car 72, thereby making it possible to avoid a collision between the upper car 71 and the lower car 72.
Further, the car operation detecting means has the upper-car speed sensor 73, thelower-carspeedsensor74, theupper-carposition sensor 75, and the lower-car position sensor 76, the actual movements of the upper car 71 and the lower car 72 can be readily detected by means of a simple construction.
While in the above-described example the output portion 79 is mounted inside the control panel 13, an output portion 79 may be mounted on each of the upper car 71 and the lower car 72. In this case, as shown in Fig. 12, the upper-car speed sensor 73, the lower-car speed sensor 74, the upper-car position sensor 75, and the lower-car position sensor 76 are electrically connected to each of the output portions 79 mounted on the upper car 71 and the lower car 72.
While in the above-described example the output portions 79 outputs the actuation signal to each the upper-car safety devices 77 and the lower-car safety devices 78, the output portion 79 may, in accordance with the information from the car operation detecting means, output the actuation signal to only one of the upper-car safety device 77 and the lower-car safety device 78. In this case, in addition to predicting whether or not collision will occur between the upper car 71 and the lower car 72, the output portions 79 also determine the presence of an abnormality in the respective movements of the upper car 71 and the lower car 72. The actuation signal is output from an output portion 79 to only the safety device mounted on the car which is moving abnormally.

Embodiment 7

Fig. 13 is a schematic diagram showing an elevator apparatus according to Embodiment 7 of the present invention. Referring to Fig. 13, an upper-car output portion 81 serving as an output portion is mounted on the upper car 71, and a lower-car output portion 82 serving as an output portion is mounted on the lower car 72. The upper-car speed sensor 73, the upper-car position sensor 75, and the lower-car position sensor 76 are electrically connected to the upper-car output portion 81. The lower-car speed sensor 74, the lower-car position sensor 76, and the upper-car position sensor 75 are electrically connected to the lower-car output portion 82.
The upper-car output portion 81 is electrically connected to the upper-car safety devices 77 through an upper-car emergency stop wiring 83 serving as transmission means installed on the upper car 71. Further, the upper-car output portion 81 predicts, on the basis of information (hereinafter referred to as "upper-car detection information" in this embodiment) from the upper-car speed sensor 73, the upper-car position sensor 75, and the lower-car position sensor 76, whether or not the upper car 71 will collide against the lower car 72, and outputs an actuation signal to the upper-car safety devices 77 upon predicting that a collision will occur. Further, when input with the upper-car detection information, the upper-car output portion 81 predicts whether or not the upper car 71 will collide against the lower car 72 on the assumption that the lower car 72 is running toward the upper car 71 at its maximum normal operation speed.
The lower-car output portion 82 is electrically connected to the lower-car safety devices 78 through a lower-car emergency stop wiring 84 serving as transmission means installed on the lower car 72. Further, the lower-car output portion 82 predicts, on the basis of information (hereinafter referred to as "lower-car detection information" in this embodiment) from the lower-car speed sensor 74, the lower-car position sensor 76, and the upper-car position sensor 75, whether or not the lower car 72 will collide against the upper car 71, and outputs an actuation signal to the lower-car safety devices 78 upon predicting that a collision will occur. Further, when input with the lower-car detection information, the lower-car output portion 82 predicts whether or not the lower car 72 will collide against the upper car 71 on the assumption that the upper car 71 is running toward the lower car 72 at its maximum normal operation speed.
Normally, the operations of the upper car 71 and the lower car 72 are controlled such that they are sufficiently spaced away from each other so that the upper-car safety devices 77 and the lower-car safety devices 78 do not actuate. Otherwise, this embodiment is of the same construction as Embodiment 6.
Next, operation is described. For instance, when, due to a break in the first main rope suspending the upper car 71, the upper car 71 falls toward the lower car 72, the upper-car output portion 81 and the lower-car output portion 82 both predict the impending collision between the upper car 71 and the lower car 72. As a result, the upper-car output portion 81 and the lower-car output portion 82 each output an actuation signal to the upper-car safety devices 77 and the lower-car safety devices 78, respectively. This actuates the upper-car safety devices 77 and the lower-car safety devices 78, thus braking the upper car 71 and the lower car 72.
In addition to providing the same effects as those of Embodiment 6, the above-described elevator apparatus, in which the upper-car speed sensor 73 is electrically connected to only the upper-car output portion 81 and the lower-car speed sensor 74 is electrically connected to only the lower-car output portion 82, obviates the need to provide electrical wiring between the upper-car speed sensor 73 and the lower-car output portion 82 and between the lower-car speed sensor 74 and the upper-car output portion 81, making it possible to simplify the electrical wiring installation.

Embodiment 8

Fig. 14 is a schematic diagram showing an elevator apparatus according to Embodiment 8 of the present invention. Referring to Fig. 14, mounted to the upper car 71 and the lower car 72 is an inter-car distance sensor 91 serving as inter-car distance detecting means for detecting the distance between the upper car 71 and the lower car 72. The inter-car distance sensor 91 includes a laser irradiation portion mounted on the upper car 71 and a reflection portion mounted on the lower car 72. The distance between the upper car 71 and the lower car 72 is obtained by the inter-car distance sensor 91 based on the reciprocation time of laser light between the laser irradiation portion and the reflection portion.
The upper-car speed sensor 73, the lower-car speed sensor 74, the upper-car position sensor 75, and the inter-car distance sensor 91 are electrically connected to the upper-car output portion 81. The upper-car speed sensor 73, the lower-car speed sensor 74, the lower-car position sensor 76, and the inter-car distance sensor 91 are electrically connected to the lower-car output portion 82.
The upper-car output portion 81 predicts, on the basis of information (hereinafter referred to as "upper-car detection information" in this embodiment) from the upper-car speed sensor 73, the lower-car speed sensor 74, the upper-car position sensor 75, and the inter-car distance sensor 91, whether or not the upper car 71 will collide against the lower car 72, and outputs an actuation signal to the upper-car safety devices 77 upon predicting that a collision will occur.
The lower-car output portion 82 predicts, on the basis of information (hereinafter referred to as "lower-car detection information" in this embodiment) from the upper-car speed sensor 73, the lower-car speed sensor 74, the lower-car position sensor 76, and the inter-car distance sensor 91, whether or not the lower car 72 will collide against the upper car 71, and outputs an actuation signal to the lower-car safety device 78 upon predicting that a collision will occur. Otherwise, this embodiment is of the same construction as Embodiment 7.
In the elevator apparatus as described above, the output portion 79 predicts whether or not a collision will occur between the upper car 71 and the lower car 72 based on the information from the inter-car distance sensor 91, making it possible to predict with improved reliability whether or not a collision will occur between the upper car 71 and the lower car 72.
It should be noted that the door closed sensor 58 of Embodiment 3 may be applied to the elevator apparatus as described in Embodiments 6 through 8 so that the output portion is input with the open/closed detection signal. It is also possible to apply the break detection lead wire 61 of Embodiment 4 here as well so that the output portion is input with the rope break signal.
While the drive portion in Embodiments 2 through 8 described above is driven by utilizing the electromagnetic repulsion force or the electromagnetic attraction force between the first electromagnetic portion 49 and the second electromagnetic portion 50, the drive portion may be driven by utilizing, for example, an eddy current generated in a conductive repulsion plate. In this case, as shown in Fig. 15, a pulsed current is supplied as an actuation signal to the electromagnet 48, and the movable portion 40 is displaced through the interaction between an eddy current generated in a repulsion plate 51 fixed to the movable portion 40 and the magnetic field from the electromagnet 48.
While in Embodiments 2 through 8 described above the car speed detecting means is provided in the hoistway 1, it may also be mounted on the car. In this case, the speed detection signal from the car speed detecting means is transmitted to the output portion through the control cable.

Embodiment 9

Fig. 16 is a plan view showing a safety device according to Embodiment 9 of the present invention. Here, a safety device 155 has the wedge 34, an actuator portion 156 connected to a lower portion of the wedge 34, and the guide portion 36 arranged above the wedge 34 and fixed to the car 3. The actuator portion 156 is vertically movable with respect to the guide portion 36 together with the wedge 34.
The actuator portion 156 has a pair of contact portions 157 capable of moving into and away from contact with the car guide rail 2, a pair of link members 158a, 158b each connected to one of the contact portions 157, an actuating mechanism 159 for displacing the link member 158a relative to the other link member 158b such that the respective contact portions 157 move into and away from contact with the car guide rail 2, and a support portion 160 supporting the contact portions 157, the link members 158a, 158b, and the actuating mechanism 159. A horizontal shaft 170, which passes through the wedge 34, is fixed to the support portion 160. The wedge 34 is capable of reciprocating displacement in the horizontal direction with respect to the horizontal shaft 170.
The link members 158a, 158b cross each other at a portion between one end to the other end portion thereof. Further, provided to the support portion 160 is a connection member 161 which pivotably connects the link member 158a, 158b together at the portion where the link members 158a, 158b cross each other. Further, the link member 158a is provided so as to be pivotable with respect to the other link member 158b about the connection member 161.
As the respective other end portions of the link member 158a, 158b are displaced so as to approach each other, each contact portion 157 is displaced into contact with the car guide rail 2. Likewise, as the respective other end portions of the link member 158a, 158b are displaced so as to separate away from each other, each contact portion 157 is displaced away from the car guide rail 2.
The actuating mechanism 159 is arranged between the respective other end portions of the link members 158a, 158b. Further, the actuating mechanism 159 is supported by each of the link members 158a, 158b. Further, the actuating mechanism 159 includes a rod-like movable portion 162 connected to the link member 158a, and a drive portion 163 fixed to the other link member 158b and adapted to displace the movable portion 162 in a reciprocating manner. The actuating mechanism 159 is pivotable about the connection member 161 together with the link members 158a, 158b.
The movable portion 162 has a movable iron core 164 accommodated within the drive portion 163, and a connecting rod 165 connecting the movable iron core 164 and the link member 158b to each other. Further, the movable portion 162 is capable of reciprocating displacement between a contact position where the contact portions 157 come into contact with the car guide rail 2 and a separated position where the contact portions 157 are separated away from contact with the car guide rail 2.
The drive portion 163 has a stationary iron core 166 including a pair of regulating portions 166a and 166b regulating the displacement of the movable iron core 164 and a side wall portion 166c that connects the regulating members 166a, 166b to each other and, surrounding the movable iron core 164, a first coil 167 which is accommodated within the stationary iron core 166 and which, when supplied with electric current, causes the movable iron core 164 to be displaced into contact with the regulating portion 166a, a second coil 168 which is accommodated within the stationary iron core 166 and which, when supplied with electric current, causes the movable iron core 164 to be displaced into contact with the other regulating portion 166b, and an annular permanent magnet 169 arranged between the first coil 167 and the second coil 168.
The regulating member 166a is so arranged that the movable iron core 164 abuts on the regulating member 166a when the movable portion 162 is at the separated position. Further, the other regulating member 166b is so arranged that the movable iron core 164 abuts on the regulating member 166b when the movable portion 162 is at the contact position.
The first coil 167 and the second coil 168 are annular electromagnets that surround the movable portion 162. Further, the first coil 167 is arranged between the permanent magnet 169 and the regulating portion 166a, and the second coil 168 is arranged between the permanent magnet 169 and the other regulating portion 166b.
With the movable iron core 164 abutting on the regulating portion 166a, a space serving as a magnetic resistance exists between the movable iron core 164 and the other regulating member 166b, with the result that the amount of magnetic flux generated by the permanent magnet 169 becomes larger on the first coil 167 side than on the second coil 168 side. Thus, the movable iron core 164 is retained in position while still abutting on the regulating member 166a.
Further, with the movable iron core 164 abutting on the other regulating portion 166b, a space serving as a magnetic resistance exists between the movable iron core 164 and the regulating member 166a, with the result that the amount of magnetic flux generated by the permanent magnet 169 becomes larger on the second coil 168 side than on the first coil 167 side. Thus, the movable iron core 164 is retained in position while still abutting on the other regulating member 166b.
Electric power serving as an actuation signal from the output portion 32 can be input to the second coil 168. When input with the actuation signal, the second coil 168 generates a magnetic flux acting against the force that keeps the movable iron core 164 in abutment with the regulating portion 166a. Further, electric power serving as a recovery signal from the output portion 32 can be input to the first coil 167. When input with the recovery signal, the first coil 167 generates a magnetic flux acting against the force that keeps the movable iron core 164 in abutment with the other regulating portion 166b.
Otherwise, this embodiment is of the same construction as Embodiment 2.
Next, operation is described. During normal operation, the movable portion 162 is located at the separated position, with the movable iron core 164 being held in abutment on the regulating portion 166a by the holding force of the permanent magnet 169. With the movable iron core 164 abutting on the regulating portion 166a, the wedge 34 is maintained at a spacing from the guide portion 36 and separated away from the car guide rail 2.
Thereafter, as in Embodiment 2, by outputting an actuation signal to each safety device 155 from the output portion 32, electric current is supplied to the second coil 168. This generates a magnetic flux around the second coil 168, which causes the movable iron core 164 to be displaced toward the other regulating portion 166b, that is, from the separated position to the contact position. As this happens, the contact portions 157 are displaced so as to approach each other, coming into contact with the car guide rail 2. Braking is thus applied to the wedge 34 and the actuator portion 155.
Thereafter, the guide portion 36 continues its descent, thus approaching the wedge 34 and the actuator portion 155. As a result, the wedge 34 is guided along the inclined surface 44, causing the car guide rail 2 to be held between the wedge 34 and the contact surface 45. Thereafter, the car 3 is braked through operations identical to those of Embodiment 2.
During the recovery phase, a recovery signal is transmitted from the output portion 32 to the first coil 167. As a result, a magnetic flux is generated around the first coil 167, causing the movable iron core 164 to be displaced from the contact position to the separated position. Thereafter, the press contact of the wedge 34 and the contact surface 45 with the car guide rail 2 is released in the same manner as in Embodiment 2.
In the elevator apparatus as described above, the actuating mechanism 159 causes the pair of contact portions 157 to be displaced through the intermediation of the link members 158a, 158b, whereby, in addition to the same effects as those of Embodiment 2, it is possible to reduce the number of actuating mechanisms 159 required for displacing the pair of contact portions 157.

Embodiment 10

Fig. 17 is a partially cutaway side view showing a safety device according to Embodiment 10 of the present invention. Referring to Fig. 17, a safety device 175 has the wedge 34, an actuator portion 176 connected to a lower portion of the wedge 34, and the guide portion 36 arranged above the wedge 34 and fixed to the car 3.
The actuator portion 176 has the actuating mechanism 159 constructed in the same manner as that of Embodiment 9, and a link member 177 displaceable through displacement of the movable portion 162 of the actuating mechanism 159.
The actuating mechanism 159 is fixed to a lower portion of the car 3 so as to allow reciprocating displacement of the movable portion 162 in the horizontal direction with respect to the car 3. The link member 177 is pivotably provided to a stationary shaft 180 fixed to a lower portion of the car 3. The stationary shaft 180 is arranged below the actuating mechanism 159.
The link member 177 has a first link portion 178 and a second link portion 179 which extend in different directions from the stationary shaft 180 taken as the start point. The overall configuration of the link member 177 is substantially a prone shape. That is, the second link portion 179 is fixed to the first link portion 178, and the first link portion 178 and the second link portion 179 are integrally pivotable about the stationary shaft 180.
The length of the first link portion 178 is larger than that of the second link portion 179. Further, an elongate hole 182 is provided at the distal end portion of the first link portion 178. A slide pin 183, which is slidably passed through the elongate hole 182, is fixed to a lower portion of the wedge 34. That is, the wedge 34 is slidably connected to the distal end portion of the first link portion 178. The distal end portion of the movable portion 162 is pivotably connected to the distal end portion of the second link portion 179 through the intermediation of a connecting pin 181.
The linkmember 177 is capable of reciprocating movement between a separated position where it keeps the wedge 34 separated away from and below the guide portion 36 and an actuating position where it causes the wedge 34 to wedge in between the car guide rail and the guide portion 36. The movable portion 162 is projected from the drive portion 163 when the link member 177 is at the separated position, and it is retracted into the drive portion 163 when the link member is at the actuating position.
Next, operation is described. During normal operation, the link member 177 is located at the separated position due to the retracting motion of the movable portion 162 into the drive portion 163. At this time, the wedge 34 is maintained at a spacing from the guide portion 36 and separated away from the car guide rail.
Thereafter, in the same manner as in Embodiment 2, an actuation signal is output from the output portion 32 to each safety device 175, causing the movable portion 162 to advance. As a result, the link member 177 is pivoted about the stationary shaft 180 for displacement into the actuating position. This causes the wedge 34 to come into contact with the guide portion 36 and the car guide rail, wedging in between the guide portion 36 and the car guide rail. Braking is thus applied to the car 3.
During the recovery phase, a recovery signal is transmitted from the output portion 32 to each safety device 175, causing the movable portion 162 to be urged in the retracting direction. The car 3 is raised in this state, thus releasing the wedging of the wedge 34 in between the guide portion 36 and the car guide rail.
The above-described elevator apparatus also provides the same effects as those of Embodiment 2.

Embodiment 11

Fig. 18 is a schematic diagram showing an elevator apparatus according to Embodiment 11 of the present invention. In Fig 18, a hoisting machine 101 serving as a driving device and a control panel 102 are provided in an upper portion within the hoistway 1. The control panel 102 is electrically connected to the hoisting machine 101 and controls the operation of the elevator. The hoisting machine 101 has a driving device main body 103 including a motor and a drive sheave 104 rotated by the driving device main body 103. A plurality of main ropes 4 are wrapped around the sheave 104. The hoisting machine 101 further includes a deflector sheave 105 around which each main rope 4 is wrapped, and a hoisting machine braking device (deceleration braking device) 106 for braking the rotation of the drive sheave 104 to decelerate the car 3. The car 3 and a counter weight 107 are suspended in the hoistway 1 by means of the main ropes 4. The car 3 and the counterweight 107 are raised and lowered in the hoistway 1 by driving the hoisting machine 101.
The safety device 33, the hoisting machine braking device 106, and the control panel 102 are electrically connected to a monitor device 108 that constantly monitors the state of the elevator. A car position sensor 109, a car speed sensor 110, and a car acceleration sensor 111 are also electrically connected to the monitor device 108. The car position sensor 109, the car speed sensor 110, and the car acceleration sensor 111 respectively serve as a car position detecting portion for detecting the speed of the car 3, a car speed detecting portion for detecting the speed of the car 3, and a car acceleration detecting portion for detecting the acceleration of the car 3. The car position sensor 109, the car speed sensor 110, and the car acceleration sensor 111 are provided in the hoistway 1.
Detection means 112 for detecting the state of the elevator includes the car position sensor 109, the car speed sensor 110, and the car acceleration sensor 111. Any of the following may be used for the car position sensor 109: an encoder that detects the position of the car 3 by measuring the amount of rotation of a rotary member that rotates as the car 3 moves; a linear encoder that detects the position of the car 3 by measuring the amount of linear displacement of the car 3; an optical displacement measuring device which includes, for example, a projector and a photodetector provided in the hoistway 1 and a reflection plate provided in the car 3, and which detects the position of the car 3 by measuring how long it takes for light projected from the projector to reach the photodetector.
The monitor device 108 includes a memory portion 113 and an output portion (calculation portion) 114. The memory portion 113 stores in advance a variety of (in this embodiment, two) abnormality determination criteria (set data) serving as criteria for judging whether or not there is an abnormality in the elevator. The output portion 114 detects whether or not there is an abnormality in the elevator based on information from the detection means 112 and the memory portion 113. The two kinds of abnormality determination criteria stored in the memory portion 113 in this embodiment are car speed abnormality determination criteria relating to the speed of the car 3 and car acceleration abnormality determination criteria relating to the acceleration of the car 3.
Fig. 19 is a graph showing the car speed abnormality determination criteria stored in the memory portion 113 of Fig. 18. In Fig. 19, an ascending/descending section of the car 3 in the hoistway 1 (a section between one terminal floor and an other terminal floor) includes acceleration/deceleration sections and a constant speed section located between the acceleration/deceleration sections. The car 3 accelerates/decelerates in the acceleration/deceleration sections respectively located in the vicinity of the one terminal floor and the other terminal floor. The car 3 travels at a constant speed in the constant speed section.
The car speed abnormality determination criteria has three detection patterns each associated with the position of the car 3. That is, a normal speed detection pattern (normal level) 115 that is the speed of the car 3 during normal operation, a first abnormal speed detection pattern (first abnormal level) 116 having a larger value than the normal speed detection pattern 115, and a second abnormal speed detection pattern (second abnormal level) 117 having a larger value than the first abnormal speed detection pattern 116 are set, each in association with the position of the car 3.
The normal speed detection pattern 115, the first abnormal speed detection pattern 116, and a second abnormal speed detection pattern 117 are set so as to have a constant value in the constant speed section, and to have a value continuously becoming smaller toward the terminal floor in each of the acceleration and deceleration sections. The difference in value between the first abnormal speed detection pattern 116 and the normal speed detection pattern 115, and the difference in value between the second abnormal speed detection pattern 117 and the first abnormal speed detection pattern 116, are set to be substantially constant at all locations in the ascending/descending section.
Fig. 20 is a graph showing the car acceleration abnormality determination criteria stored in the memory portion 113 of Fig. 18. In Fig. 20, the car acceleration abnormality determination criteria has three detection patterns each associated with the position of the car 3. That is, a normal acceleration detection pattern (normal level) 118 that is the acceleration of the car 3 during normal operation, a first abnormal acceleration detection pattern (first abnormal level) 119 having a larger value than the normal acceleration detection pattern 118, and a second abnormal acceleration detection pattern (second abnormal level) 120 having a larger value than the first abnormal acceleration detection pattern 119 are set, each in association with the position of the car 3.
The normal acceleration detection pattern 118, the first abnormal acceleration detection pattern 119, and the second abnormal acceleration detection pattern 120 are each set so as to have a value of zero in the constant speed section, a positive value in one of the acceleration/deceleration section, and a negative value in the other acceleration/deceleration section. The difference in value between the first abnormal acceleration detection pattern 119 and the normal acceleration detection pattern 118, and the difference in value between the second abnormal acceleration detection pattern 120 and the first abnormal acceleration detection pattern 119, are set to be substantially constant at all locations in the ascending/descending section.
That is, the memory portion 113 stores the normal speed detection pattern 115, the first abnormal speed detection pattern 116, and the second abnormal speed detection pattern 117 as the car speed abnormality determination criteria, and stores the normal acceleration detection pattern 118, the first abnormal acceleration detection pattern 119, and the second abnormal acceleration detection pattern 120 as the car acceleration abnormality determination criteria.
The safety device 33, the control panel 102, the hoisting machine braking device 106, the detection means 112, and the memory portion 113 are electrically connected to the output portion 114. Further, a position detection signal, a speed detection signal, and an acceleration detection signal are input to the output portion 114 continuously over time from the car position sensor 109, the car speed sensor 110, and the car acceleration sensor 111. The output portion 114 calculates the position of the car 3 based on the input position detection signal. The output portion 114 also calculates the speed of the car 3 and the acceleration of the car 3 based on the input speed detection signal and the input acceleration detection signal, respectively, as a variety of (in this example, two) abnormality determination factors.
The output portion 114 outputs an actuation signal (trigger signal) to the hoisting machine braking device 106 when the speed of the car 3 exceeds the first abnormal speed detection pattern 116, or when the acceleration of the car 3 exceeds the first abnormal acceleration detection pattern 119. At the same time, the output portion 114 outputs a stop signal to the control panel 102 to stop the drive of the hoisting machine 101. When the speed of the car 3 exceeds the second abnormal speed detection pattern 117, or when the acceleration of the car 3 exceeds the second abnormal acceleration detection pattern 120, the output portion 114 outputs an actuation signal to the hoisting machine braking device 106 and the safety device 33. That is, the output portion 114 determines to which braking means it should output the actuation signals according to the degree of the abnormality in the speed and the acceleration of the car 3.
Otherwise, this embodiment is of the same construction as Embodiment 2.
Next, operation is described. When the position detection signal, the speed detection signal, and the acceleration detection signal are input to the output portion 114 from the car position sensor 109, the car speed sensor 110, and the car acceleration sensor 111, respectively, the output portion 114 calculates the position, the speed, and the acceleration of the car 3 based on the respective detection signals thus input. After that, the output portion 114 compares the car speed abnormality determination criteria and the car acceleration abnormality determination criteria obtained from the memory portion 113 with the speed and the acceleration of the car 3 calculated based on the respective detection signals input. Through this comparison, the output portion 114 detects whether or not there is an abnormality in either the speed or the acceleration of the car 3.
During normal operation, the speed of the car 3 has approximately the same value as the normal speed detection pattern, and the acceleration of the car 3 has approximately the same value as the normal acceleration detection pattern. Thus, the output portion 114 detects that there is no abnormality in either the speed or the acceleration of the car 3, and normal operation of the elevator continues.
When, for example, the speed of the car 3 abnormally increases and exceeds the first abnormal speed detection pattern 116 due to some cause, the output portion 114 detects that there is an abnormality in the speed of the car 3. Then, the output portion 114 outputs an actuation signal and a stop signal to the hoisting machine braking device 106 and the control panel 102, respectively. As a result, the hoisting machine 101 is stopped, and the hoisting machine braking device 106 is operated to brake the rotation of the drive sheave 104.
When the acceleration of the car 3 abnormally increases and exceeds the first abnormal acceleration set value 119, the output portion 114 outputs an actuation signal and a stop signal to the hoisting machine braking device 106 and the control panel 102, respectively, thereby braking the rotation of the drive sheave 104.
If the speed of the car 3 continues to increase after the actuation of the hoisting machine braking device 106 and exceeds the second abnormal speed set value 117, the output portion 114 outputs an actuation signal to the safety device 33 while still outputting the actuation signal to the hoisting machine braking device 106. Thus, the safety device 33 is actuated and the car 3 is braked through the same operation as that of Embodiment 2.
Further, when the acceleration of the car 3 continues to increase after the actuation of the hoisting machine braking device 106, and exceeds the second abnormal acceleration set value 120, the output portion 114 outputs an actuation signal to the safety device 33 while still outputting the actuation signal to the hoisting machine braking device 106. Thus, the safety device 33 is actuated.
With such an elevator apparatus, the monitor device 108 obtains the speed of the car 3 and the acceleration of the car 3 based on the information from the detection means 112 for detecting the state of the elevator. When the monitor device 108 judges that there is an abnormality in the obtained speed of the car 3 or the obtained acceleration of the car 3, the monitor device 108 outputs an actuation signal to at least one of the hoisting machine braking device 106 and the safety device 33. That is, judgment of the presence or absence of an abnormality is made by the monitor device 108 separately for a variety of abnormality determination factors such as the speed of the car and the acceleration of the car. Accordingly, an abnormality in the elevator can be detected earlier and more reliably. Therefore, it takes a shorter time for the braking force on the car 3 to be generated after occurrence of an abnormality in the elevator.
Further, the monitor device 108 includes the memory portion 113 that stores the car speed abnormality determination criteria used for judging whether or not there is an abnormality in the speed of the car 3, and the car acceleration abnormality determination criteria used for judging whether or not there is an abnormality in the acceleration of the car 3. Therefore, it is easy to change the judgment criteria used for judging whether or not there is an abnormality in the speed and the acceleration of the car 3, respectively, allowing easy adaptation to design changes or the like of the elevator.
Further, the following patterns are set for the car speed abnormality determination criteria: the normal speed detection pattern 115, the first abnormal speed detection pattern 116 having a larger value than the normal speed detection pattern 115, and the second abnormal speed detection pattern 117 having a larger value than the first abnormal speed detection pattern 116. When the speed of the car 3 exceeds the first abnormal speed detection pattern 116, the monitor device 108 outputs an actuation signal to the hoisting machine braking device 106,and when the speed of the car 3 exceeds the second abnormal speed detection pattern 117, the monitor device 108 outputs an actuation signal to the hoisting machine braking device 106 and the safety device 33. Therefore, the car 3 can be braked stepwise according to the degree of this abnormality in the speed of the car 3. As a result, the frequency of large shocks exerted on the car 3 can be reduced, and the car 3 can be more reliably stopped.
Further, the following patterns are set for the car acceleration abnormality determination criteria: the normal acceleration detection pattern 118, the first abnormal acceleration detection pattern 119 having a larger value than the normal acceleration detection pattern 118, and the second abnormal acceleration detection pattern 120 having a larger value than the first abnormal acceleration detection pattern 119. When the acceleration of the car 3 exceeds the first abnormal acceleration detection pattern 119, the monitor device 108 outputs an actuation signal to the hoisting machine braking device 106,and when the acceleration of the car 3 exceeds the second abnormal acceleration detection pattern 120, the monitor device 108 outputs an actuation signal to the hoisting machine braking device 106 and the safety device 33. Therefore, the car 3 can be braked stepwise according to the degree of an abnormality in the acceleration of the car 3. Normally, an abnormality occurs in the acceleration of the car 3 before an abnormality occurs in the speed of the car 3. As a result, the frequency of large shocks exerted on the car 3 can be reduced, and the car 3 can be more reliably stopped.
Further, the normal speed detection pattern 115, the first abnormal speed detection pattern 116, and the second abnormal speed detection pattern 117 are each set in association with the position of the car 3. Therefore, the first abnormal speed detection pattern 116 and the second abnormal speed detection pattern 117 each can be set in association with the normal speed detection pattern 115 at all locations in the ascending/descending section of the car 3. In the acceleration/deceleration sections, in particular, the first abnormal speed detection pattern 116 and the second abnormal speed detection pattern 117 each can be set to a relatively small value because the normal speed detection pattern 115 has a small value. As a result, the impact acting on the car 3 upon braking can be mitigated.
It should be noted that in the above-described example, the car speed sensor 110 is used when the monitor 108 obtains the speed of the car 3. However, instead of using the car speed sensor 110, the speed of the car 3 may be obtained from the position of the car 3 detected by the car position sensor 109. That is, the speed of the car 3 may be obtained by differentiating the position of the car 3 calculated by using the position detection signal from the car position sensor 109.
Further, in the above-described example, the car acceleration sensor 111 is used when the monitor 108 obtains the acceleration of the car 3. However, instead of using the car acceleration sensor 111, the acceleration of the car 3 may be obtained from the position of the car 3 detected by the car position sensor 109. That is, the acceleration of the car 3 may be obtained by differentiating, twice, the position of the car 3 calculated by using the position detection signal from the car position sensor 109.
Further, in the above-described example, the output portion 114 determines to which braking means it should output the actuation signals according to the degree of the abnormality in the speed and acceleration of the car 3 constituting the abnormality determination factors. However, the braking means to which the actuation signals are to be output may be determined in advance for each abnormality determination factor.

Embodiment 12

Fig. 21 is a schematic diagram showing an elevator apparatus according to Embodiment 12 of the present invention. In Fig. 21, a plurality of hall call buttons 125 are provided in the hall of each floor. A plurality of destination floor buttons 126 are provided in the car 3. A monitor device 127 has the output portion 114. An abnormality determination criteria generating device 128 for generating a car speed abnormality determination criteria and a car acceleration abnormality determination criteria is electrically connected to the output portion 114. The abnormality determination criteria generating device 128 is electrically connected to each hall call button 125 and each destination floor button 126. A position detection signal is input to the abnormality determination criteria generating device 128 from the car position sensor 109 via the output portion 114.
The abnormality determination criteria generating device 128 includes a memory portion 129 and a generation portion 130. The memory portion 129 stores a plurality of car speed abnormality determination criteria and a plurality of car acceleration abnormality determination criteria, which serve as abnormal judgment criteria for all the cases where the car 3 ascends and descends between the floors. The generation portion 130 selects a car speed abnormality determination criteria and a car acceleration abnormality determination criteria one by one from the memory portion 129, and outputs the car speed abnormality determination criteria and the car acceleration abnormality determination criteria to the output portion 114.
Each car speed abnormality determination criteria has three detection patterns each associated with the position of the car 3, which are similar to those of Fig. 19 of Embodiment 11. Further, each car acceleration abnormality determination criteria has three detection patterns each associated with the position of the car 3, which are similar to those of Fig. 20 of Embodiment 11.
The generation portion 130 calculates a detection position of the car 3 based on information from the car position sensor 109, and calculates a target floor of the car 3 based on information from at least one of the hall call buttons 125 and the destination floor buttons 126. The generation portion 130 selects one by one a car speed abnormality determination criteria and a car acceleration abnormality determination criteria used for a case where the calculated detection position and the target floor are one and the other of the terminal floors.
Otherwise, this embodiment is of the same construction as Embodiment 11.
Next, operation is described. A position detection signal is constantly input to the generation portion 130 from the car position sensor 109 via the output portion 114. When a passenger or the like selects any one of the hall call buttons 125 or the destination floor buttons 126 and a call signal is input to the generation portion 130 from the selected button, the generation portion 130 calculates a detection position and a target floor of the car 3 based on the input position detection signal and the input call signal, and selects one out of both a car speed abnormality determination criteria and a car acceleration abnormality determination criteria. After that, the generation portion 130 outputs the selected car speed abnormality determination criteria and the selected car acceleration abnormality determination criteria to the output portion 114.
The output portion 114 detects whether or not there is an abnormality in the speed and the acceleration of the car 3 in the same way as in Embodiment 11. Thereafter, this embodiment is of the same operation as Embodiment 9.
With such an elevator apparatus, the car speed abnormality determination criteria and the car acceleration abnormality determination criteria are generated based on the information from at least one of the hall call buttons 125 and the destination floor buttons 126. Therefore, it is possible to generate the car speed abnormality determination criteria and the car acceleration abnormality determination criteria correspondingtothetargetfloor. As a result, the time it takes for the braking force on the car 3 to be generated after occurrence of an abnormality in the elevator can be reduced even when a different target floor is selected.
It should be noted that in the above-described example, the generation portion 130 selects one out of both the car speed abnormality determination criteria and car acceleration abnormality determination criteria from among a plurality of car speed abnormality determination criteria and a plurality of car acceleration abnormality determination criteria stored in the memory portion 129. However, the generation portion may directly generate an abnormal speed detection pattern and an abnormal acceleration detection pattern based on the normal speed pattern and the normal acceleration pattern of the car 3 generated by the control panel 102.

Embodiment 13

Fig. 22 is a schematic diagram showing an elevator apparatus according to Embodiment 13 of the present invention. Inthisexample, each of the main ropes 4 is connected to an upper portion of the car 3 via a rope fastening device 131 (Fig. 23). The monitor device 108 is mounted on an upper portion of the car 3. The car position sensor 109, the car speed sensor 110, and a plurality of rope sensors 132 are electrically connected to the output portion 114. Rope sensors 132 are provided in the rope fastening device 131, and each serve as a rope break detecting portion for detecting whether or not a break has occurred in each of the ropes 4. The detection means 112 includes the car position sensor 109, the car speed sensor 110, and the rope sensors 132.
The rope sensors 132 each output a rope brake detection signal to the output portion 114 when the main ropes 4 break. The memory portion 113 stores the car speed abnormality determination criteria similar to that of Embodiment 11 shown in Fig. 19, and a rope abnormality determination criteria used as a reference for judging whether or not there is an abnormality in the main ropes 4.
A first abnormal level indicating a state where at least one of the main ropes 4 have broken, and a second abnormal level indicating a state where all of the main ropes 4 has broken are set for the rope abnormality determination criteria.
The output portion 114 calculates the position of the car 3 based on the input position detection signal. The output portion 114 also calculates the speed of the car 3 and the state of the main ropes 4 based on the input speed detection signal and the input rope brake signal, respectively, as a variety of (in this example, two) abnormality determination factors.
The output portion 114 outputs an actuation signal (trigger signal) to the hoisting machine braking device 106 when the speed of the car 3 exceeds the first abnormal speed detection pattern 116 (Fig. 19), or when at least one of the main ropes 4 breaks. When the speed of the car 3 exceeds the second abnormal speed detection pattern 117 (Fig. 19), or when all of the main ropes 4 break, the output portion 114 outputs an actuation signal to the hoisting machine braking device 106 and the safety device 33. That is, the output portion 114 determines to which braking means it should output the actuation signals according to the degree of an abnormality in the speed of the car 3 and the state of the main ropes 4.
Fig. 23 is a diagram showing the rope fastening device 131 and the rope sensors 132 of Fig. 22. Fig. 24 is a diagram showing a state where one of the main ropes 4 of Fig. 23 has broken. In Figs. 23 and 24, the rope fastening device 131 includes a plurality of rope connection portions 134 for connecting the main ropes 4 to the car 3. The rope connection portions 134 each include an spring 133 provided between the main rope 4 and the car 3. The position of the car 3 is displaceable with respect to the main ropes 4 by the expansion and contraction of the springs 133.
The rope sensors 132 are each provided to the rope connection portion 134. The rope sensors 132 each serve as a displacement measuring device for measuring the amount of expansion of the spring 133. Each rope sensor 132 constantly outputs a measurement signal corresponding to the amount of expansion of the spring 133 to the output portion 114. A measurement signal obtained when the expansion of the spring 133 returning to its original state has reached a predetermined amount is input to the output portion 114 as a break detection signal. It should be noted that each of the rope connection portions 134 may be provided with a scale device that directly measures the tension of the main ropes 4.
Otherwise, this embodiment is of the same construction as Embodiment 11.
Next, operation is described. When the position detection signal, the speed detection signal, and the break detection signal are input to the output portion 114 from the car position sensor 109, the car speed sensor 110, and each rope sensor 131, respectively, the output portion 114 calculates the position of the car 3, the speed of the car 3, and the number of main ropes 4 that have broken based on the respective detection signals thus input. After that, the output portion 114 compares the car speed abnormality determination criteria and the rope abnormality determination criteria obtained from the memory portion 113 with the speed of the car 3 and the number of broken main ropes 4 calculated based on the respective detection signals input. Through this comparison, the output portion 114 detects whether or not there is an abnormality in both the speed of the car 3 and the state of the main ropes 4.
During normal operation, the speed of the car 3 has approximately the same value as the normal speed detection pattern, and the number of broken main ropes 4 is zero. Thus, the output portion 114 detects that there is no abnormality in either the speed of the car 3 or the state of the main ropes 4, and normal operation of the elevator continues.
When, for example, the speed of the car 3 abnormally increases and exceeds the first abnormal speed detection pattern 116 (Fig. 19) for some reason, the output portion 114 detects that there is an abnormality in the speed of the car 3. Then, the output portion 114 outputs an actuation signal and a stop signal to the hoisting machine braking device 106 and the control panel 102, respectively. As a result, the hoisting machine 101 is stopped, and the hoisting machine raking device 106 is operated to brake the rotation of the drive sheave 104.
Further, when at least one of the main ropes 4 has broken, the output portion 114 outputs an actuation signal and a stop signal to the hoisting machine braking device 106 and the control panel 102, respectively, thereby braking the rotation of the drive sheave 104.
If the speed of the car 3 continues to increase after the actuation of the hoisting machine braking device 106 and exceeds the second abnormal speed set value 117 (Fig. 19), the output portion 114 outputs an actuation signal to the safety device 33 while still outputting the actuation signal to the hoisting machine braking device 106. Thus, the safety device 33 is actuated and the car 3 is braked through the same operation as that of Embodiment 2.
Further, if all the main ropes 4 break after the actuation of the hoisting machine braking device 106, the output portion 114 outputs an actuation signal to the safety device 33 while still outputting the actuation signal to the hoisting machine braking device 106. Thus, the safety device 33 is actuated.
With such an elevator apparatus, the monitor device 108 obtains the speed of the car 3 and the state of the main ropes 4 based on the information from the detection means 112 for detecting the state of the elevator. When the monitor device 108 judges that there is an abnormality in the obtained speed of the car 3 or the obtained state of the main ropes 4, the monitor device 108 outputs an actuation signal to at least one of the hoisting machine braking device 106 and the safety device 33. This means that the number of targets for abnormality detection increases, allowing abnormality detection of not only the speed of the car 3 but also the state of the main ropes 4. Accordingly, an abnormality in the elevator can be detected earlier and more reliably. Therefore, it takes a shorter time for the braking force on the car 3 to be generated after occurrence of an abnormality in the elevator.
It should be noted that in the above-described example, the rope sensor 132 is disposed in the rope fastening device 131 provided to the car 3. However, the rope sensor 132 may be disposed in a rope fastening device provided to the counterweight 107.
Further, in the above-described example, the present invention is applied to an elevator apparatus of the type in which the car 3 and the counterweight 107 are suspended in the hoistway 1 by connecting one end portion and the other end portion of the main rope 4 to the car 3 and the counterweight 107, respectively. However, the present invention may also be applied to an elevator apparatus of the type in which the car 3 and the counterweight 107 are suspended in the hoistway 1 by wrapping the main rope 4 around a car suspension sheave and a counterweight suspension sheave, with one end portion and the other end portion of the main rope 4 connected to structures arranged in the hoistway 1. In this case, the rope sensor is disposed in the rope fastening device provided to the structures arranged in the hoistway 1.

Embodiment 14

Fig. 25 is a schematic diagram showing an elevator apparatus according to Embodiment 14 of the present invention. In this example, a rope sensor 135 serving as a rope brake detecting portion is constituted by lead wires embedded in each of the main ropes 4. Each of the lead wires extends in the longitudinal direction of the rope 4. Both end portion of each lead wire are electrically connected to the output portion 114. A weak current flows in the lead wires. Cut-off of current flowing in each of the lead wires is input as a rope brake detection signal to the output portion 114.
Otherwise, this embodiment is of the same construction as Embodiment 13.
With such an elevator apparatus, a break in any main rope 4 is detected based on cutting off of current supply to any lead wire embedded in the main ropes 4. Accordingly, whether or not the rope has broken is more reliably detected without being affected by a change of tension of the main ropes 4 due to acceleration and deceleration of the car 3.

Embodiment 15

Fig. 26 is a schematic diagram showing an elevator apparatus according to Embodiment 15 of the present invention. In Fig. 26, the car position sensor 109, the car speed sensor 110, and a door sensor 140 are electrically connected to the output portion 114. The door sensor 140 serves as an entrance open/closed detecting portion for detecting open/closed of the car entrance 26. The detection means 112 includes the car position sensor 109, the car speed sensor 110, and the door sensor 140.
The door sensor 140 outputs a door-closed detection signal to the output portion 114 when the car entrance 26 is closed. The memory portion 113 stores the car speed abnormality determination criteria similar to that of Embodiment 11 shown in Fig. 19, and an entrance abnormality determination criteria used as a reference for judging whether or not there is an abnormality in the open/close state of the car entrance 26. If the car ascends/descends while the car entrance 26 is not closed, the entrance abnormality determination criteria regards this as an abnormal state.
The output portion 114 calculates the position of the car 3 based on the input position detection signal. The output portion 114 also calculates the speed of the car 3 and the state of the car entrance 26 based on the input speed detection signal and the input door-closing detection signal, respectively, as a variety of (in this example, two) abnormality determination factors.
The output portion 114 outputs an actuation signal to the hoisting machine braking device 104 if the car ascends/descends while the car entrance 26 is not closed, or if the speed of the car 3 exceeds the first abnormal speed detection pattern 116 (Fig. 19). If the speed of the car 3 exceeds the second abnormal speed detection pattern 117 (Fig. 19), the output portion 114 outputs an actuation signal to the hoisting machine braking device 106 and the safety device 33.
Fig. 27 is a perspective view of the car 3 and the door sensor 140 of Fig. 26. Fig. 28 is a perspective view showing a state in which the car entrance 26 of Fig. 27 is open. In Figs. 27 and 28, the door sensor 140 is provided at an upper portion of the car entrance 26 and in the center of the car entrance 26 with respect to the width direction of the car 3. The door sensor 140 detects displacement of each of the car doors 28 into the door-closed position, and outputs the door-closed detection signal to the output portion 114.
It should be noted that a contact type sensor, a proximity sensor, or the like may be used for the door sensor 140. The contact type sensor detects closing of the doors through its contact with a fixed portion secured to each of the car doors 28. The proximity sensor detects closing of the doors without contacting the car doors 28. Further, a pair of hall doors 142 for opening/closing a hall entrance 141 are provided at the hall entrance 141. The hall doors 142 are engaged to the car doors 28 by means of an engagement device (not shown) when the car 3 rests at a hall floor, and are displaced together with the car doors 28.
Otherwise, this embodiment is of the same construction as Embodiment 11.
Next, operation is described. When the position detection signal, the speed detection signal, and the door-closed detection signal are input to the output portion 114 from the car position sensor 109, the car speed sensor 110, and the door sensor 140, respectively, the output portion 114 calculates the position of the car 3, the speed of the car 3, and the state of the car entrance 26 based on the respective detection signals thus input. After that, the output portion 114 compares the car speed abnormality determination criteria and the drive device state abnormality determination criteria obtained from the memory portion 113 with the speed of the car 3 and the state of the car of the car doors 28 calculated based on the respective detection signals input. Through this comparison, the output portion 114 detects whether or not there is an abnormality in each of the speed of the car 3 and the state of the car entrance 26.
During normal operation, the speed of the car 3 has approximately the same value as the normal speed detection pattern, and the car entrance 26 is closed while the car 3 ascends/descends. Thus, the output portion 114 detects that there is no abnormality in each of the speed of the car 3 and the state of the car entrance 26, and normal operation of the elevator continues.
When, for instance, the speed of the car 3 abnormally increases and exceeds the first abnormal speed detection pattern 116 (Fig. 19) for some reason, the output portion 114 detects that there is an abnormality in the speed of the car 3. Then, the output portion 114 outputs an actuation signal and a stop signal to the hoisting machine braking device 106 and the control panel 102, respectively. As a result, the hoisting machine 101 is stopped, and the hoisting machine braking device 106 is actuated to brake the rotation of the drive sheave 104.
Further, the output portion 114 also detects an abnormality in the car entrance 26 when the car 3 ascends/descends while the car entrance 26 is not closed. Then, the output portion 114 outputs an actuation signal and a stop signal to the hoisting machine braking device 106 and the control panel 102, respectively, thereby braking the rotation of the drive sheave 104.
When the speed of the car 3 continues to increase after the actuation of the hoisting machine braking device 106, and exceeds the second abnormal speed set value 117 (Fig. 19), the output portion 114 outputs an actuation signal to the safety device 33 while still outputting the actuation signal to the hoisting machine braking device 106. Thus, the safety device 33 is actuated and the car 3 is braked through the same operation as that of Embodiment 2.
With such an elevator apparatus, the monitor device 108 obtains the speed of the car 3 and the state of the car entrance 26 based on the information from the detection means 112 for detecting the state of the elevator. When the monitor device 108 judges that there is an abnormality in the obtained speed of the car 3 or the obtained state of the car entrance 26, the monitor device 108 outputs an actuation signal to at least one of the hoisting machine braking device 106 and the safety device 33. This means that the number of targets for abnormality detection increases, allowing abnormality detection of not only the speed of the car 3 but also the state of the car entrance 26. Accordingly, abnormalities of the elevator can be detected earlier and more reliably. Therefore, it takes less time for the braking force on the car 3 to be generated after occurrence of an abnormality in the elevator.
It should be noted that while in the above-described example, the door sensor 140 only detects the state of the car entrance 26, the door sensor 140 may detect both the state of the car entrance 26 and the state of the elevator hall entrance 141. In this case, the door sensor 140 detects displacement of the elevator hall doors 142 into the door-closed position, as well as displacement of the car doors 28 into the door-closed position. With this construction, abnormality in the elevator can be detected even when only the car doors 28 are displaced due to a problem with the engagement device or the like that engages the car doors 28 and the elevator hall doors 142 with each other.

Embodiment 16

Fig. 29 is a schematic diagram showing an elevator apparatus according to Embodiment 16 of the present invention. Fig. 30 is a diagram showing an upper portion of the hoistway 1 of Fig. 29. In Figs. 29 and 30, a power supply cable 150 is electrically connected to the hoisting machine 101. Drive power is supplied to the hoisting machine 101 via the power supply cable 150 through control of the control panel 102.
A current sensor 151 serving as a drive device detection portion is provided to the power supply cable 150. The current sensor 151 detects the state of the hoisting machine 101 by measuring the current flowing in the power supply cable 150. The current sensor 151 outputs to the output portion 114 a current detection signal (drive device state detection signal) corresponding to the value of a current in the power supply cable 150. The current sensor 151 is provided in the upper portion of the hoistway 1. A current transformer (CT) that measures an induction current generated in accordance with the amount of current flowing in the power supply cable 150 is used as the current sensor 151, for example.
The car position sensor 109, the car speed sensor 110, and the current sensor 151 are electrically connected to the output portion 114. The detection means 112 includes the car position sensor 109, the car speed sensor 110, and the current sensor 151.
The memory portion 113 stores the car speed abnormality determination criteria similar to that of Embodiment 11 shown in Fig. 19, and a drive device abnormality determination criteria used as a reference for determining whether or not there is an abnormality in the state of the hoisting machine 101.
The drive device abnormality determination criteria has three detection patterns. That is, a normal level that is the current value flowing in the power supply cable 150 during normal operation, a first abnormal level having a larger value than the normal level, and a second abnormal level having a larger value than the first abnormal level, are set for the drive device abnormality determination criteria.
The output portion 114 calculates the position of the car 3 based on the input position detection signal. The output portion 114 also calculates the speed of the car 3 and the state of the hoisting device 101 based on the input speed detection signal and the input current detection signal, respectively, as a variety of (in this example, two) abnormality determination factors.
The output portion 114 outputs an actuation signal (trigger signal) to the hoisting machine braking device 106 when the speed of the car 3 exceeds the first abnormal speed detection pattern 116 (Fig. 19), or when the amount of the current flowing in the power supply cable 150 exceeds the value of the first abnormal level of the drive device abnormality determination criteria. When the speed of the car 3 exceeds the second abnormal speed detection pattern 117 (Fig. 19), or when the amount of the current flowing in the power supply cable 150 exceeds the value of the second abnormal level of the drive device abnormality determination criteria, the output portion 114 outputs an actuation signal to the hoistingmachine braking device 106 and the safety device 33. That is, the output portion 114 determines to which braking means it should output the actuation signals according to the degree of abnormality in each of the speed of the car 3 and the state of the hoisting machine 101.
Otherwise, this embodiment is of the same construction as embodiment 11.
Next, operation is described. When the position detection signal, the speed detection signal, and the current detection signal are input to the output portion 114 from the car position sensor 109, the car speed sensor 110, and the current sensor 151, respectively, the output portion 114 calculates the position of the car 3, the speed of the car 3, and the amount of current flowing in the power supply cable 151 based on the respective detection signals thus input. After that, the output portion 114 compares the car speed abnormality determination criteria and the drive device state abnormality determination criteria obtained from the memory portion 113 with the speed of the car 3 and the amount of the current flowing into the current supply cable 150 calculated based on the respective detection signals input. Through this comparison, the output portion 114 detects whether or not there is an abnormality in each of the speed of the car 3 and the state of the hoisting machine 101.
During normal operation, the speed of the car 3 has approximately the same value as the normal speed detection pattern 115 (Fig. 19), and the amount of current flowing in the power supply cable 150 is at the normal level. Thus, the output portion 114 detects that there is no abnormality in each of the speed of the car 3 and the state of the hoistingmachine 101, and normal operation of the elevator continues.
If, for instance, the speed of the car 3 abnormally increases and exceeds the first abnormal speed detection pattern 116 (Fig. 19) for some reason, the output portion 114 detects that there is an abnormality in the speed of the car 3. Then, the output portion 114 outputs an actuation signal and a stop signal to the hoisting machine braking device 106 and the control panel 102, respectively. As a result, the hoisting machine 101 is stopped, and the hoisting machine braking device 106 is actuated to brake the rotation of the drive sheave 104.
If the amount of current flowing in the power supply cable 150 exceeds the first abnormal level in the drive device state abnormality determination criteria, the output portion 114 outputs an actuation signal and a stop signal to the hoisting machine braking device 106 and the control panel 102, respectively, thereby braking the rotation of the drive sheave 104.
When the speed of the car 3 continues to increase after the actuation of the hoisting machine braking device 106, and exceeds the second abnormal speed set value 117 (Fig. 19), the output portion 114 outputs an actuation signal to the safety device 33 while still outputting the actuation signal to the hoisting machine braking device 106. Thus, the safety device 33 is actuated and the car 3 is braked through the same operation as that of Embodiment 2.
When the amount of current flowing in the power supply cable 150 exceeds the second abnormal level of the drive device state abnormality determination criteria after the actuation of the hoisting machine braking device 106, the output portion 114 outputs an actuation signal to the safety device 33 while still outputting the actuation signal to the hoisting machine braking device 106. Thus, the safety device 33 is actuated.
With such an elevator apparatus, the monitor device 108 obtains the speed of the car 3 and the state of the hoisting machine 101 based on the information from the detection means 112 for detecting the state of the elevator. When the monitor device 108 judges that there is an abnormality in the obtained speed of the car 3 or the state of the hoisting machine 101, the monitor device 108 outputs an actuation signal to at least one of the hoisting machine braking device 106 and the safety device 33. This means that the number of targets for abnormality detection increases, and it takes a shorter time for the braking force on the car 3 to be generated after occurrence of an abnormality in the elevator.
It should be noted that in the above-described example, the state of the hoisting machine 101 is detected using the current sensor 151 for measuring the amount of the current flowing in the power supply cable 150. However the state of the hoisting machine 101 may be detected using a temperature sensor for measuring the temperature of the hoisting machine 101.
Further, in Embodiments 11 through 16 described above, the output portion 114 outputs an actuation signal to the hoisting machine braking device 106 before outputting an actuation signal to the safety device 33. However, the output portion 114 may instead output an actuation signal to one of the following brakes: a car brake for braking the car 3 by gripping the car guide rail 2, which is mounted on the car 3 independently of the safety device 33; a counterweight brake mounted on the counterweight 107 for braking the counterweight 107 by gripping a counterweight guide rail for guiding the counterweight 107; and a rope brakemounted in the hoistway 1 for braking the main ropes 4 by locking up the main ropes 4.
Further, in Embodiments 1 through 16 described above, the electric cable is used as the transmitting means for supplying power from the output portion to the safety device. However, a wireless communication device having a transmitter provided at the output portion and a receiver provided at the safety device may be used instead. Alternatively, an optical fiber cable that transmits an optical signal may be used.
Further, in Embodiments 1 through 16, the safety device applies braking with respect to overspeed (motion) of the car in the downward direction. However, the safety device may apply braking with respect to overspeed (motion) of the car in the upward direction by using the safety device fixed upside down to the car.

Embodiment 17

Next, reference will be made to Fig. 31, which is a schematic diagram showing an elevator apparatus according to Embodiment 17 of the present invention. Referring to the figure, a pair of car suspending pulleys 202a and 202b are provided below a car 201. A counterweight suspending pulley 204 is provided in the upper portion of a counterweight 203. The car 201 is raised and lowered within a hoistway while being guided by a car guide rail (not shown). The counterweight 203 is raised and lowered within the hoistway while being guided by a counterweight guide rail (not shown).
A driving device (hoisting machine) 205 that raises and lowers the car 201 and the counterweight 203 is installed in the lower portion of the hoistway. The driving device 205 has a drive sheave 206 and a driving device main body 207 rotating the drive sheave 206. The driving device main body 207 includes a motor and a braking device.
The car 201 and the counterweight 203 are suspended within the hoistway according to a 2: 1 roping method by means of a plurality of main ropes 208 (only one of which is shown in the figure).
Rope end support portions 219a and 219b are fixed in an upper portion of the hoistway. The main rope 208 has a car-side end portion (car-side hitch end) 208a connected to the rope end support portion 219a, and a counterweight-side end portion (counterweight-side hitch end) 208b connected to the rope end support portion 219b.
A car-side return pulley 209 and a counterweight-side return pulley 210 are provided in the upper portion of the hoistway.
Further, the main rope 208 is wound, sequentially from the car-side end portion 208a to the counterweight-side end portion 208b, around the car suspending pulleys 202a and 202b, the car-side return pulley 209, the drive sheave 206, the counterweight-side return pulley 210, and the counterweight suspending pulley 204 in order.
A speed governor 211 is installed in the upper portion of the hoistway. The speed governor 211 has a speed governor sheave 212 which is rotated at a speed corresponding to a traveling speed of the car 201. A speed governor rope 213 is wound around the speed governor sheave 212. Both end portions of the speed governor rope 213 are connected to the car 201. A lower end portion of the speed governor rope 213 is provided with a speed governor rope tension pulley 214 that applies a tensile force to the speed governor rope 213.
The speed governor 211 is provided with a speed sensor 215 that generates a signal for detecting a traveling speed of the car 201. For example, an encoder is used as the speed sensor 215.
An elevator control portion 216 controls operation of the driving device 205. The elevator control portion 216 calculates a position and a speed of the car 201 based on a signal from the speed sensor 215, creates a traveling pattern of the car 201, and controls the driving device 205.
Further, the elevator control portion 216 compares the car speed with excess speed pattern as shown in Fig. 19, and immediately stops the car 201 when the car speed reaches a set excess speed. More specifically, when the car speed reaches a first set excess speed (first abnormality level), the elevator control portion 216 shuts off power distribution to the driving device 205 and brakes the drive sheave 206 by means of the braking device of the driving device 205. Further, when the car speed reaches a second set excess speed (second abnormality level), the elevator control portion 216 directly brakes the car 201 by means of a safety device (not shown) mounted in the car 201.
The safety devices described in Embodiments 1 to 16 (directly operated emergency stoppers) 5, 33, 77, and 78 can be given as an example of a safety device.
Alternatively, a conventionally employed mechanical safety device may be used as a safety device. In this case, an actuator portion that grips the speed governor rope 213 upon receiving an actuation signal from the elevator control portion 216 may be provided in the speed governor 211 or in the vicinity thereof.
A car oscillation detector 217 that generates a signal for detecting oscillation of the car-side end portion 208a is provided in the upper portion of the hoistway. The car oscillation detector 217 receives oscillation and thereby generates a voltage signal corresponding to the oscillation. The signal from the car oscillation detector 217 is inputted to a mischief detecting portion (mischief determination processing portion) 218.
The mischief detecting portion 218 detects mischief-related car oscillation according to the signal from the car oscillation detector 217, and transmits a mischief detection signal to the elevator control portion 216. Further, the mischief detecting portion 218 includes a storage portion (ROM) in which a reference value and a determination program for determining whether or not car oscillation is ascribable to mischief are stored, a processing portion (CPU) for performing an arithmetic processing of the determination program, a RAM, an input/output portion, and the like.
Upon receiving a mischief detection signal, the elevator control portion 216 moves the car 201 to the nearest floor then stops the car.
Fig. 32 is a front view showing, in an enlarged manner, a neighboring region of the car oscillation detector 217 of Fig. 31. Fig. 33 is a side view showing a neighboring region of the car oscillation detector 217 of Fig. 32. Referring to the figures, a shackle rod 221 is connected to each car-side end portion 208a. Each shackle rod 221 penetrates the rope end support portion 219a.
An upper spring bearing 222 is attached to an upper end portion of each shackle rod 221. A spring (elastic body) 223 is interposed between each upper spring bearing 222 and the rope end support portion 219a.
Further, an attachment member 224 is attached to the upper end portion of each shackle rod 221. The car oscillation detector 217 is mounted to an upper end portion of one of the attachment members 224.
Next, operation will be described. When the car 201 oscillates due to mischief or the like by a passenger, the oscillation of the car is transferred to the car oscillation detector 217 via the main rope 213. The car oscillation detector 217 generates a voltage signal corresponding to vertical oscillation. The voltage signal generated by the car oscillation detector 217 is transmitted to the mischief detecting portion 218.
In the mischief detecting portion 218, the inputted voltage signal is compared with a preset reference value, and it is determined whether or not the magnitude of the car oscillation is at a level affecting detection of excess speed by means of the elevator control portion 216.
When the magnitude of car oscillation is at a negligible level, the car 201 is allowed to travel further. Further, when the magnitude of car oscillation reaches a preset level, a mischief detection signal is inputted from the mischief detecting portion 218 to the elevator control portion 216, and the car 201 is moved to the nearest floor and stopped. At this moment, a warning or an announcement can also be issued in the car 201.
Further, it is also appropriate that a warning or an announcement is issued in the car 201 when a mischief detection signal is inputted, and that the car 201 is stopped on the nearest floor only when car oscillation nevertheless continues. That is, the control of a case where a mischief detection signal has been outputted may be changed in various manners.
In the elevator apparatus thus constructed, oscillation generated in the car 201 is measured by the car oscillation detector 217 via the main rope 208 having a length corresponding to the position of the car 201. Also, oscillation of the car 201 is transferred to the speed governor 211 via the speed governor rope 213 having a length corresponding to the position of the car 201. Accordingly, oscillation detected by the car oscillation detector 217 is approximately equivalent to oscillation affecting the speed sensor 215 provided in the speed governor 211.
Thus, by detecting oscillation of the car-side end portion 208a of the main rope 208 by means of the car oscillation detector 217 and by determining the magnitude of the car oscillation by means of the detecting portion 218 based on a detection signal of the car oscillation detector 217, erroneous detection of excess speed can be more reliably prevented from occurring due to mischief-related car oscillation. Further, erroneous detection of mischief-related car oscillation can be detected.
Although the elevator apparatus that detects excess speed according to a signal from the speed sensor 215 and brakes the car 201 is described in Embodiment 17, the present invention is also applicable to an elevator apparatus employing a combination of a conventional mechanical speed governor and a conventional mechanical safety device. This elevator apparatus can also accurately detect mischief-related car oscillation.

Embodiment 18

Next, reference will be made to Fig. 34, which is a front view showing an essential part of an elevator apparatus according to Embodiment 18 of the present invention. In this example, a weighing device 225 for detecting a laden weight of the car 201 is provided with a car oscillation detector for detecting mischief-related car oscillation.
The weighing device 225 has a detection pulley 226 that is rotatably supported in the upper portion of the hoistway, a detection wire 227 that is wound around the detection pulley 226, and an angle sensor 228 that generates a signal for detecting a rotation angle of the detection pulley 226. The angle sensor 228 serves also as a car oscillation detector that generates a signal for detecting car oscillation.
A first end portion of the detection wire 227 is connected to the upper end portion of one of the attachment members 224. A second end portion of the detection wire 227 is connected to the rope end support portion 219a via a spring 229. The spring 229 applies a tensile force to the detection wire 227. The angle sensor 228 is mounted on the detection pulley 226. Other constructional details of Embodiment 18 are similar to those of Embodiment 17.
Next, operation will be described. The spring 223 is caused to expand and contract according to the laden weight in the car 201. The attachment member 224 is vertically displaced as the spring 223 expands or contracts. The first end portion of the detection wire 227 is connected to the attachment member 224. Therefore, when the attachment member 224 is displaced, the detection pulley 226 is rotated by an angle corresponding to a displacement amount of the attachment member 224. In other words, the rotation angle of the detection pulley 226 corresponds to the laden weight in the car 201. Accordingly, the laden weight in the car 201 can be measured by processing an output signal from the angle sensor 228.
Since a change in the weight of the car 201 is intrinsically a static change, a processing circuit with a long sampling period is used to process an output signal from the angle sensor 228. Meanwhile, the frequency of mischief-related car oscillation is about 1 to 5 Hz, and a processing circuit with a short sampling period is required in order to detect such oscillation. In Embodiment 18, therefore, a processing circuit for detecting car oscillation is provided separately from a processing circuit for measuring a laden weight.
Based on a detection result in the processing circuit for detecting car oscillation as described above, the mischief detecting portion 218 determines whether or not car oscillation is ascribable to mischief.
Accordingly, erroneous detection of excess speed can be more reliably prevented from occurring due to mischief-related car oscillation and erroneous detection of mischief-related car oscillation can also be prevented.
Further, since the existing angle sensor 228 can be utilized as an oscillation detector for detecting car oscillation, it is possible to suppress increasing costs.

Embodiment 19

Next, reference will be made to Fig. 35, which is a schematic diagram showing an elevator apparatus according to Embodiment 19 of the present invention. Referring to the figure, the elevator control portion has an operation control portion 231 which controls operation of the driving device 205 and the like, and a security monitoring portion 232 which stops the car 201 by means of the driving device 205 and the safety device in the event of an abnormality in the elevator.
A mischief detection signal from the mischief detecting portion 218 is inputted to the safety monitoring portion 232, which is independent of the operation control portion 231. When a mischief detection signal is inputted to the safety monitoring portion 232, a safety switch 232a of the safety monitoring portion 232 is turned off, and power distribution to the driving device 205 is shut off. Thus, the motor of the driving device 205 is stopped from being driven, and the drive sheave 206 is braked by the braking device, so that the car 201 is stopped as an emergency measure. Other constructional details of Embodiment 19 is similar to those of Embodiment 17.
According to this construction, even in the case of excess speed being caused by the drive control portion, erroneous detection of excess speed can be more reliably prevented from occurring due to mischief-related car oscillation and erroneous detection of mischief-related car oscillation can also be prevented. In Embodiment 19, the mischief detecting portion 218 may also be constructed as part of the safety monitoring portion 232.

Embodiment 20

Reference will be made next to Fig. 36, which is a schematic diagram showing an elevator apparatus according to Embodiment 20 of the present invention. Referring to the figure, a mischief detection signal from the mischief detecting portion 218 is selectively inputted to either the operation control portion 231 or the safety monitoring portion 232 according to the detected level of car oscillation.
For example, when the level of car oscillation is lower than a preset level, a mischief detection signal is inputted to the operation control portion 231, and the car 201 is moved to the nearest floor then stopped. In contrast, when the level of car oscillation is equal to or higher than the preset level, a mischief detection signal is inputted to the safety monitoring portion 232, and the car 201 is stopped as an emergency measure.
In this manner, it is also possible to perform a different kind of control after the detection of car oscillation, according to the level of the car oscillation.

Embodiment 21

Next, reference will be made to Fig. 37, which is a schematic diagram showing an elevator apparatus according to Embodiment 21 of the present invention. Referring to the figure, the driving device 205 and a deflector pulley 233 are disposed in the upper portion of the hoistway. The main rope 208 is wound around the drive sheave 206 and the deflector pulley 233.
The car-side end portion 208a of the main rope 208 is connected to a top portion of the car 201. The counterweight-side end portion 208b of the main rope 208 is connected to a top portion of the counterweight 203. In other words, the car 201 and the counterweight 203 are suspended according to a 1:1 roping method by means of the main rope 208.
The car 201 is mounted with a car oscillation detector 234 which, generates a signal for detecting oscillation of the car 201. The speed governor 211 is mounted with a speed governor oscillation detector 235 which, generates a signal for detecting oscillation of the speed governor 211. Signals from the car oscillation detector 234 and the speed governor oscillation detector 235 are inputted to the mischief detecting portion 218. Other constructional details of Embodiment 21 are similar to those of Embodiment 17.
Fig. 38 is a flowchart showing operation of the mischief detecting portion 218 of Fig. 37. While the elevator is operating normally, the mischief detecting portion 218 supervises, based on a signal from the speed governor oscillation detector 235, whether or not the speed governor 211 has oscillated (step S1). When an oscillation of the speed governor 211 is not detected, normal operation is further continued.
When oscillation of the speed governor 211 is detected, it is confirmed whether or not the magnitude of the oscillation is equal to or larger than a first reference value (step S2). The first reference value is set lower than an oscillation level on which excess speed is erroneously detected.
When the magnitude of oscillation of the speed governor 211 is equal to or larger than the first reference value, a mischief detection signal is outputted to the elevator control portion 216 (step S3).
When the magnitude of oscillation of the speed governor 211 is smaller than the first reference value, it is confirmed in turn whether or not the magnitude of oscillation of the speed governor 211 is equal to or larger than a second reference value (step S4). As a matter of course, the second reference value is set smaller than the first reference value. When the magnitude of oscillation is smaller than the second reference value, normal operation is further continued.
When the magnitude of oscillation of the speed governor 211 is equal to or larger than the second reference value and smaller than the first reference value, it is confirmed, based on a signal from the car oscillation detector 234, whether or not the car 201 has oscillated (step S5). When oscillation of the car 201 is not detected, normal operation is further continued.
When oscillation of the car 201 is detected, it is determined that the oscillation is likely to be ascribable to mischief by a passenger, and a mischief detection signal is outputted (step S3).
Any of the methods according to Embodiments 17, 19, and 20 can be carried out as a method of controlling the elevator after a mischief detection signal has been outputted. More specifically, as an example, it is possible to apply a control method in which the car 201 is stopped on the nearest floor, when a mischief detection signal is outputted. Furthermore, it is possible to apply a control method wherein the car 201 is stopped as an emergency measure when the magnitude of oscillation of the speed governor 211 is equal to or larger than the first reference value and wherein the car 201 is stopped on the nearest floor when the magnitude of oscillation of the speed governor 211 is smaller than the first reference value and larger than the second reference value and oscillation of the car 201 has been detected.
In the elevator apparatus thus constructed, the speed governor oscillation detector 235 detects oscillation of the speed governor 211, and the car oscillation detector 234 detects an oscillation of the car 201. Therefore, it is possible to detect an oscillation of the speed governor 211 earlier, and to determine more accurately whether or not the oscillation of the speed governor 211 is caused by the swinging of the car 201. Accordingly, erroneous detection of excess speed can be more reliably prevented from occurring due to mischief-related car oscillation, and erroneous detection of mischief-related car oscillation can be prevented.
The car oscillation detector may be disposed anywhere as long as the detection of car oscillation is possible. For example, in the case of the elevator apparatus according to the 2:1 roping method as described in Embodiments 17 to 20, oscillation of the car may be indirectly detected by detecting oscillation of the car-side end portion of the main rope.
Further, in the case where the car is mounted with a car oscillation detector, it is possible to provide the car oscillation detector on the car frame or in a car chamber. However, by providing the car oscillation detector directly in the car chamber, car oscillation resulting from mischief by a passenger in the car chamber can be detected more reliably. Further, in the case where the car oscillation detector is provided in the car chamber, the detection sensitivity of car oscillation can further be enhanced by installing the car oscillation detector in the car chamber above its lower portion connected to the car frame.

Embodiment 22

Reference will be made next to Fig. 39, which is a schematic diagram showing an elevator apparatus according to Embodiment 22 of the present invention. In this example, the speed governor rope 213 is connected to the car 201 via an oscillation suppressor 236. Fig. 40 is a side view showing in an enlarged manner the oscillation suppressor 236 of Fig. 39.
Further, a signal from the car oscillation detector 217 is inputted to the mischief detecting portion 218 via a D/A converter 237 and a filter 238. The filter 238 corrects a detection error in the car oscillation detector 217 resulting from a difference between a transfer characteristic of oscillation from the car 201 to the speed governor 211 and a transfer characteristic of oscillation from the car 201 to the car oscillation detector 217.
That is, through the filter 238, oscillation detected by the car oscillation detector 217 is approximated to oscillation of the speed governor 211. In the filter 238, a detection signal is corrected using parameters such as a weight M1 of the car chamber, a weight M2 of the car frame supporting the car chamber, a rigidity K1 of a rubber cushion provided between the car chamber and the car frame, a rigidity Kr of the main rope 208, a spring rigidity Kc of the oscillation suppressor 236, a rigidity Kg of the speed governor rope 213, and the like.
Fig. 41 is an explanatory view showing an example of signal correction by means of the filter 238 of Fig. 39. For example, a detection signal as indicated by (b) can be obtained by correcting a detection signal as indicated by (a) in consideration of transfer characteristic.
Accordingly, erroneous detection of excess speed can be more reliably prevented from occurring due to mischief-related car oscillation and erroneous detection of mischief-related car oscillation can also be prevented.
A correction made by the filter 238 is also applicable to an elevator apparatus that does not employ the oscillation suppressor 236.
Further, in a mischief determination algorithm of Embodiment 21 as well, the determination accuracy can be enhanced by correcting a signal from the speed governor detector 235 or the car oscillation detector 234 by means of the filter 238.
Furthermore, it is also possible to correct a single detection signal by means of a plurality of filters. Fig. 42 is an explanatory view showing an example in which a detection signal from a single oscillation detector is corrected in two different manners. As shown in the figure, a post-correction signal can be used to determine an oscillation of the speed governor, by making a correction based on a transfer characteristic A from a detection position to the speed governor. Further, a post-correction signal can be used to determine an oscillation of the car, by making a correction based on a transfer characteristic B from a detection position to the car. Thus, the use of a single oscillation detector makes it possible to detect the oscillation of the car and the oscillation of the speed governor, and to carry out the control method as described in Embodiment 21.
Still further, in order to apply a filter to transfer characteristic to various kinds of elevators, it is also appropriate to perform an operational action for identifying a transfer characteristic immediately after an elevator is installed.
Further, the parameters used for the filter are not limited to those of the above-mentioned examples, but may include an raising or lowering stroke, a capacity, and the like.

Claims

An elevator apparatus comprising:
a car that is mounted with car suspending pulleys and raised and lowered within a hoistway;

a counterweight that is mounted with a counterweight suspending pulley and raised and lowered within the hoistway;

a driving device that has a drive sheave and raises and lowers the car and the counterweight;

a main rope that has a car-side end portion and a counterweight-side end portion connected to an upper portion of the hoistway, and is wound around the car suspending pulleys, the counterweight suspending pulley, and the drive sheave;

a speed governor that has a speed governor sheave rotated at a speed corresponding to a traveling speed of the car, and is provided in the upper portion of the hoistway;

a speed governor rope that is wound around the speed governor sheave and connected to the car;

an elevator control portion that detects a traveling speed of the car from a rotation of the speed governor sheave, and controls operation of the car according to a detection result;

a car oscillation detector that is provided in the upper portion of the hoistway, and serves to detect oscillation of the car-side end portion; and

a mischief detecting portion that detects mischief-related car oscillation according to a signal from the car oscillation detector.
An elevator apparatus according to Claim 1, wherein the car is moved to a nearest floor and stopped by means of the elevator control portion when the mischief detecting portion detects mischief-related car oscillation.
An elevator apparatus according to Claim 1, wherein the elevator control portion has an operation control portion that controls operation of the driving device, and a safety monitoring portion that is independent of the operation control portion, and
wherein when the mischief detecting portion detects mischief-related car oscillation, an emergency stoppage is executed on the car by the safety monitoring portion.
An elevator apparatus according to Claim 1, wherein the elevator control portion has an operation control portion that controls operation of the driving device, and a safety monitoring portion that is independent of the operation control portion, and
wherein when the mischief detecting portion detects mischief-related car oscillation, a mischief detection signal is selectively inputted to either the operation control portion or the safety monitoring portion according to a level of the detected car oscillation.
An elevator apparatus according to Claim 4, wherein when the level of the car oscillation is equal to or higher than a preset level, the mischief detection signal is inputted to the safety monitoring portion and the car is stopped as an emergency measure.
An elevator apparatus according to Claim 1, wherein a weighing device for detecting a laden weight of the car is connected to the car-side end portion;
wherein the weighing device has a detection pulley that is rotated according to a laden weight of the car, and an angle sensor that detects a rotation angle of the detection pulley; and
wherein the angle sensor serves also as the car oscillation detector.
An elevator apparatus comprising:
a driving device that has a drive sheave;

a main rope that is wound around the drive sheave;

a car that is suspended within a hoistway by means of the main rope and raised and lowered by the driving device;

a speed governor that has a speed governor sheave rotated at a speed corresponding to a traveling speed of the car;

an elevator control portion that detects a traveling speed of the car from a rotation of the speed governor sheave and controls operation of the car according to a detection result;

a speed governor oscillation detector for detecting oscillation of the speed governor;

a car oscillation detector for detecting oscillation of the car; and

a mischief detecting portion that detects mischief-related car oscillation according to signals from the speed governor oscillation detector and the car oscillation detector.
An elevator apparatus according to Claim 7, wherein the car is stopped as an emergency measure when a magnitude of oscillation of the speed governor is equal to or larger than a preset first reference value, and
wherein the car is stopped on a nearest floor when a magnitude of oscillation of the speed governor is smaller than the first reference value and equal to or larger than a second reference value and oscillation of the car has been detected.