JP2007030999A - Safety device for elevator device and operation method for elevator device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To certainly and automatically reset a car even after an emergency stop is operated in an elevator device. <P>SOLUTION: The elevator device 100 has a governor 50 for detecting a speed of the car 1; and an emergency stop mechanism 53 clamping a guide rail 10 and stop the car at emergency. If the car exceeds a setting limitation speed, a cam latch mechanism 54 operates the emergency stop mechanism. A drive pulley 15 is mounted to an end of a rotation shaft 14b of a roller 11e of the governor through a one-way clutch 16. Only when the car is ascended, motive power is transmitted from the rotation shaft to the drive pulley. A drive connection switching mechanism 4 for transmitting drive force only for a predetermined time after operation of the emergency stop is connected to a cam 24 of the cam latch mechanism. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a safety device for an elevator apparatus and a method for operating the elevator apparatus.

  An example of a conventional elevator apparatus is described in Patent Document 1. This elevator device includes a speed governor that does not use a rope and an emergency stop device as safety devices. The drive unit of the emergency stop device generates frictional force to brake the elevator. On the other hand, the governor detects whether or not the moving speed of the elevator exceeds the speed limit, and when the speed exceeds the speed limit, the cam latch mechanism of the drive unit is operated.

  By the way, in the elevator apparatus of this patent document 1, it has a return mechanism which returns an elevator apparatus to normal operation, after an emergency stop operation | movement operates and an elevator car stops. This return mechanism utilizes a frictional force acting between the guide rail that guides the raising and lowering of the elevator car and the rail clamping member of the emergency stop mechanism and a car raising operation. More specifically, the emergency stop mechanism has a compression spring that opens during the emergency stop operation. On the other hand, in the returning operation, the compression spring is compressed when the car rises by using the frictional force between the guide rail and the rail clamping member. Thereby, a drive part and a cam latch mechanism are returned to the original state.

JP 9-328268 A

  In the safety device for an elevator apparatus described in Patent Document 1 described above, since the frictional force acting between the guide rail and the rail clamping member of the emergency stop mechanism is used to return the emergency stop mechanism, the return operation is not effective. May become stable. That is, when the car is stopped by operating the emergency stop, the car moves while the guide rail and the rail holding member slide. As a result, the surfaces of the guide rail and the rail clamping member after an emergency stop change due to frictional heat or the like, and the braking time of the car at this time varies depending on the size of the car and the loaded weight. Therefore, the sliding time between the guide rail and the rail holding member is not constant, and the surface of the rail holding member also changes variously. Since the surface state changes variously, the frictional force required at the time of return also changes, which may exceed a predetermined frictional force. If the set frictional force is increased in order to eliminate this problem, the entire apparatus becomes large, and the driving force of the elevator apparatus increases. Further, in the return operation, the friction force decreases as the car rises, so the friction force becomes smaller than the spring force of the emergency stop mechanism, and the return operation may not be achieved.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to automatically return a car surely after an emergency stop is operated in an elevator apparatus.

  A feature of the present invention that achieves the above object is that a speed governor that detects the speed of an elevator device, an emergency stop mechanism that generates a frictional force between a guide rail that guides a car, and the speed governor that has an abnormal speed And a return device for releasing the emergency stop mechanism and returning the cam latch mechanism to a predetermined position after the emergency stop mechanism is activated and the elevator car stops. The safety device of the elevator device is provided, and this return device is capable of transmitting the driving force generated by the speed governor to the cam latch mechanism only when the car is raised after the operation of the emergency stop mechanism.

  In this aspect, the return device preferably includes a one-way clutch that does not transmit the power of the governor to the cam of the cam latch mechanism when lowered, and a clutch that is released as the coupling with the cam increases. May include a one-way clutch that does not transmit the power of the governor to the cam of the cam latch mechanism when descending, and a power unit that is connected to the cam and has a gear train, and the gear train may have an intermittent gear.

  Another feature of the present invention that achieves the above object is that in the elevator apparatus operating method, when the speed governor detects that the car is operating exceeding a preset limit speed, the cam latch mechanism is driven to The stop mechanism is operated, the emergency stop mechanism holds the guide rail to stop the car, and after the car stops, the cam latch mechanism is operated using the return device. When the car is lowered, the cam of the cam latch mechanism However, the return mechanism is not connected to the cam of the cam latch mechanism when it is raised except when the car is raised after the emergency stop operation.

  Still another feature of the present invention that achieves the above object is that a speed governor that is attached to a car of an elevator device that moves up and down the hoistway to detect the speed of the car and a guide rail that extends in the up and down direction of the hoistway are sandwiched. And a safety device for an elevator apparatus comprising: an emergency stop mechanism for emergency stopping the car; and a cam latch mechanism for operating the emergency stop mechanism when the car exceeds a predetermined limit speed. A return mechanism is provided between the speed governor and the cam latch mechanism that uses the power generated between the speed governor and the cam latch mechanism to return from the active state to the inactive state after the cam latch mechanism is changed from the inactive state to the active state. It is a thing.

  In this aspect, the return mechanism preferably includes a drive mechanism that abuts on the guide rail and generates a rotational drive force, and a connection mechanism that connects the drive mechanism and the cam latch mechanism. Further, it is preferable that the return mechanism includes a transmission element switching unit that transmits the rotational driving force only when the car is raised, and an intermittent drive transmission unit that can transmit the driving force only while the car is rising. The intermittent drive transmission means includes a swash plate that converts rotational motion into translational motion, and this swash plate may reciprocate between a plurality of rotating members including a cam and a clutch provided coaxially.

  In the above feature, the intermittent drive transmission means may include an intermittent gear or a rack having a portion having no meshing teeth, and the return mechanism rotates the cam included in the cam latch mechanism in one direction and the emergency stop mechanism. The cam latch mechanism may be returned. Furthermore, a connection member for connecting the cam latch mechanism to the emergency stop mechanism may be provided, and the return mechanism may return the emergency stop mechanism and the cam latch mechanism using the connection member.

  According to the present invention, since the emergency stop mechanism of the elevator apparatus has a mechanism that enables irreversible operation, the emergency stop mechanism can be reliably returned to the original state even when the emergency stop is operated. .

  Hereinafter, an elevator device according to the present invention and a safety device used therefor will be described with reference to the drawings. FIG. 1 is a perspective view of an embodiment of an elevator apparatus 100 according to the present invention. In the elevator apparatus 100, the passenger car 1 ascends and descends the hoistway using the pair of guide rails 10 as a guide. A speed governor 50 that detects the speed of the car 1 is held in an L-shaped housing 7 attached to the top of the car 1. The housing 7 has a vertical flat plate portion and a horizontal flat plate portion integrated with the vertical flat plate portion at the lower end of the vertical flat plate portion, and the horizontal flat plate portion is fixed to the upper surface of the car 1. On the other hand, an emergency stop mechanism 53 for emergency stopping the car 1 is disposed below the side of the car 1. A cam latch mechanism 54 is connected to the emergency stop mechanism 53. The cam latch mechanism 54 is disposed above the emergency stop mechanism 53 and operates the emergency stop mechanism 53. A return mechanism 55 having one end connected to the cam latch mechanism 54 and the other end connected to the speed governor 50 returns the emergency stop mechanism 53 and the cam latch mechanism 54 to the initial state. The speed governor 50, the emergency stop mechanism 53, the cam latch mechanism 54, and the return mechanism 55 constitute a safety device.

  These details are described below. The speed governor 50 includes a speed detection unit 51 that detects the speed of the car 1 and a speed control part 52 that determines whether or not the speed of the car 1 exceeds a set limit speed. The speed detection unit 51 includes a belt 12 and a plurality of pulleys 11a to 11f on which the belt 12 is mounted. The pulleys 11a to 11f rotate in the same plane. The pulleys 11a to 11d are arranged in a row so as to press the belt 12 against the guide rail 10, and the pulley 11e and the pulley 11f output the speed of the car 1 detected by the belt 12, and thus support shafts 14a and 14b, respectively. Is connected. The intermediate portion of the support shaft 14 a connected to the pulley 11 f is fitted and held in a hole formed in the upper portion of the vertical flat plate portion of the housing 7. In order to detect the speed of the car 1 with high accuracy, a pressing member (not shown) presses the belt 12 against the guide rail 10.

  Two pendulums 9 and 18 are attached to the end of the support shaft 14a opposite to the pulley 11f attachment end so as to be rotationally symmetric. These pendulums 9 and 18 have the same shape and the same weight. The pendulums 9 and 18 are connected by the rod 17 so that the swing angles of the pendulums 9 and 18 are the same. The protrusion formed on the rotating shaft 14a and the outer diameter end of one pendulum 18 are connected by an adjustment spring 21 that adjusts the operating speed. As a result, the pendulums 9 and 18 rotate in conjunction with the rotation of the pulley 11f, and the generated centrifugal force acts to extend the adjustment spring 21. The pendulums 9 and 18 and the adjustment spring 21 constitute a speed control unit 52.

  The emergency stop mechanism 53 is disposed with the guide rail 10 interposed therebetween, and includes a fixing member 2 fixed to the side outer wall of the car 1 and wedge-shaped movable members 3a and 3b slidable on the fixing member 2. The fixing member 2 includes a pair of vertical members and a horizontal member that connects the upper ends of the vertical members. The vertical member has a trapezoidal vertical cross section, and has a wedge shape with a shorter lateral length as it goes downward. And these two vertical members are opposingly arranged at intervals. A pair of wedge-shaped movable members 3a and 3b is disposed between a pair of vertical members, and the lateral length decreases as it goes upward. The wedge-shaped movable members 3a and 3b are arranged with the protruding portion 2 of the guide rail having a convex cross section interposed therebetween.

  The end of the support shaft 23 of the cam latch mechanism 54 is horizontally held below the trajectory formed by the movement of the pendulums 9 and 18 of the governor 50 on the vertical flat plate portion of the casing 7. A cam 24 is rotatably attached to the support shaft 23. The protruding portion 8 is attached to the support shaft 23 from the vertical plate portion rather than the cam 24 so as to face the pendulums 9 and 17. When the car 1 exceeds the set speed limit, the protruding portion 8 comes into contact with the pendulums 9 and 18 to detect an abnormality in the speed of the car 1.

  The outer peripheral portion of the cam 24 is in contact with the roller 25a. The roller 25a is provided to relieve the frictional resistance with the cam 24, and is rotatably attached to the upper portion of the support shaft 25c arranged vertically. An end portion of an L-shaped horizontal member 25d is attached to the lower end of the support shaft 25c. A vertical bar 25b is attached to the other end of the horizontal member 25d.

  A spring receiving upper plate 26 that holds the compression spring 5 is attached to an intermediate portion of the vertical bar 25b. A hole through which the vertical bar 25 b passes is formed, and a spring receiving lower plate 27 that holds the lower end of the compression spring 5 is fixed to the side surface of the car 1. Therefore, the compression spring 5 is sandwiched between the spring receiving upper plate 26 and the spring receiving lower plate 27. The support shaft 25c, the horizontal member 25d, and the vertical bar 25c are integrated to form the pulling bar 25. The lifting rod 25 interlocks the cam 24 on the car 1 and the emergency stop mechanism 53 below the side surface of the car 1.

  The vertical bar 25b passes through the transverse member of the fixed member 2 of the emergency stop mechanism 53, and the lower end thereof is connected to the wedge-shaped movable members 3a and 3b. When the lifting rod 25 is pulled upward, the wedge-shaped movable members 3 a and 3 b are restricted from moving in the lateral direction by the fixed member 2. As a result, the wedge-shaped movable members 3a and 3b are pressed against the guide rail 10, and a frictional force is generated.

  The return mechanism 55 uses the rotation of the belt 12 in contact with the guide rail 10 as a driving force in order to return the emergency stop mechanism 53 and the cam latch mechanism 54 to the normal state by using the relative movement between the guide rail 10 and the car 1. Use. A driving pulley 15 for mounting the belt 19 is attached to the other end of the rotation support shaft 14b to which the pulley 11e of the governor 50 is attached at one end. The belt 19 is also mounted on a driven pulley 20 attached to the support shaft 20a. When the pulley 15 rotates, the driven pulley 20 also rotates. However, since the one-way clutch 16 is attached to the end of the support shaft 14b, the belt 19 transmits the driving force from the rotation support shaft 14b to the drive pulley 15 only when the pulley 15 rotates in a predetermined direction. To do.

  The one-way clutch 16 rotates the rotation support shaft 14b and the drive pulley 15 in conjunction with each other when the car 1 is raised. And when the cage | basket | car 1 descend | falls, both connection will be open | released so that it can rotate independently. Between the driven pulley 20 and the cam 24, a clutch receiver 28 attached to the shaft end of the support shaft 20a, the swash plates 6 and 16 attached to the opposite side of the support shaft 23 to which the cam 24 is attached, and the clutch 22 There is provided a drive connection switching mechanism 4 having. The drive connection switching mechanism 4 returns the cam 24 to its original position after the cam 24 rotates and operates the emergency stop mechanism 53.

  The swash plates 6 and 13 switch the rotational motion of the cam 24 to translational motion. The clutch 22 is a coupling machine for coupling with the driven pulley 20. The clutch 22 and the clutch receiver 28 are arranged apart from each other by a predetermined interval in the axial direction. FIG. 2 is a sectional view showing details of the drive connection switching mechanism 4.

  The cam 24 and the swash plate 6 are integrally formed and fixed to the support shaft 23. The axial end surface of the swash plate 6 has a shape cut by a plane inclined from a plane perpendicular to the axis. A swash plate 13 having an end face parallel to this end face of the swash plate 6 is loosely fitted to the support shaft 23. The swash plate 13 is movable in the axial direction of the cam shaft 23. In order to prevent the swash plate 13 from rotating around the support shaft 23, a protruding plate 13 b that holds a detent rod 31 is provided on the outer peripheral surface of the swash plate 13. One end of the rotation stopper 31 is attached to the support plate 32.

  Between the support plate 32 and the projecting plate 13b, a detent rod 31 penetrates and a regulating member 13a for regulating the axial movement of the swash plate 13 is disposed. A tension spring 34 is provided between the support plate 32 and the protruding plate 13b, and pulls the swash plate 13 toward the swash plate 6 side. A sphere 29 is rotatably attached near the outer periphery of the portion where the swash plate 6 extends most in the axial direction. The sphere 29 reduces the contact frictional force with the swash plate 13.

  The clutch 22 is formed in a cylindrical container shape with the swash plate 13 side opened. A bearing 33 is held between the open end face of the clutch 22 and the swash plate 13 so that the clutch 22 can move and rotate left and right along the cam shaft 23. A meshing portion 35 is attached to the end portion of the clutch 22 on the side opposite to the swash plate via a compression spring 30. A plurality of teeth having inclined surfaces 22a are formed in the meshing portion 35 at intervals in the circumferential direction. A plurality of the compression springs 30 are arranged at intervals in the circumferential direction, and relieve the impact at the time of meshing with the clutch receiver 28. The compression spring 30 prevents the rotation of the cam 24 from being hindered.

  A cam shaft hole having a square cross section is formed at the center of the side surface of the clutch 22 on the side opposite to the swash plate, and the cam shaft hole portion 23b of the support shaft 23 is fitted into this cam shaft hole. The rotational movement of the support shaft 23 and the movement of the meshing part 35 are interlocked. The support shaft 20a of the driven pulley 20 and the shaft center of the support shaft 23 coincide with each other so that the teeth of the meshing portion 35 and the meshing teeth provided with the inclined surface 28a formed on the clutch receiver 20 are accurately opposed to each other. Arrange as follows. A plurality of teeth of the clutch receiver 20 are provided at intervals in the circumferential direction so as to correspond to the teeth of the meshing portion 35. When the clutch 22 is connected to the clutch receiver 28, the inclined surfaces 22a and 28a guide the engagement.

  The detailed shape of the cam 24 included in the cam latch mechanism 54 is shown in a front view in FIG. The cam 24 rotates in the direction of the arrow y24 around the rotation center 24e. At the position 24a where the roller 25a attached to the end of the lifting rod 25 contacts during normal operation, the roller 25a and the cam 24 are stabilized in order to prevent the emergency stop mechanism 53 from malfunctioning due to disturbance such as vibration. It is a concave shape that maintains its posture.

In order to operate the emergency stop mechanism 53 at a high speed, a notch 24b for suddenly changing the radius of the cam 24 is formed at a position advanced in the rotational direction from the steady position 24a and very close to the steady position 24a. The radius of the cam 24 gradually decreases after passing through the notch 24b, and continues to decrease until the position 24c where the cam 24 rotates about 1/3 of a round. After the minimum radius position 24c, the radius of the cam 24 starts to increase and gradually increases to a position 24d rotated by about 150 degrees. From the maximum radius position 24d to the steady position 24a, the radius of the cam 24 gradually decreases again. Accordingly, the radius r at each position in the circumferential direction of the cam 24 has a relationship of r _24d > r _24a > r _24b > r _24c .

  Operation | movement of the safety device of the elevator apparatus 100 which concerns on this invention which has the above structure is demonstrated using FIG. In FIG. 4, the emergency stop mechanism 53, the cam latch mechanism 54, and the return mechanism 55 are shown in a side view and a sectional view. In addition, in FIG. 4, each mechanism 53-55 is typically arrange | positioned in parallel. FIG. 2A shows a state before the emergency stop mechanism 53 is activated. It is assumed that the car 1 is descending. Since the speed of the car 1 does not exceed the set limit speed, the cam 24 is in contact with the roller 25a attached to the lifting rod 25 at the steady position 24a of the cam 24.

  The wedge-shaped movable members 3a and 3b of the emergency stop mechanism 53 are located below the fixed member 2 and do not contact the guide rail 10 (not shown) located between the wedge-shaped movable members 3a and 3b. The compression spring 5 presses the roller 25a against the cam 24 in a contracted state. When the car 1 is lowered, the rotary shaft 14b rotating in the direction of the arrow y25 and the drive pulley 15 are not connected by the action of the one-way clutch 16. That is, the drive pulley 15 and the driven pulley 20 are stationary. The clutch 22 is in a position spaced apart from the clutch receiver 28 in the axial direction and is not engaged. When the normal car 1 is lowered, all but the rotating shaft 14b are stationary.

  FIG. 4B shows a state where the emergency stop mechanism 53 is activated. Since the lowering speed of the car 1 exceeds the set limit speed, the pendulums 9 and 17 are opened outward by the centrifugal force acting on the pendulums 9 and 17 of the governor 50 and hit the protrusions 8 of the cam 24. The cam 24 rotates in the counterclockwise direction y24. Since the cam 24 rotates past the notch 24 b of the cam 24, the radius of the cam 24 sharply decreases, and the lifting rod 25 that has been restrained from being lifted by the cam 24 is rapidly pulled up by the opening force of the compression spring 5. It is done. Since the lifting rod 25 has risen rapidly, the wedge-shaped movable members 3a and 3b of the emergency stop mechanism 53 connected to the lower end of the lifting rod 25 are also lifted.

  When the roller 25a comes into contact with the notch 24b of the cam 24, the interval between each wedge-shaped movable member 3a, 3b and the fixed member 2 is abruptly reduced. After that, the interval gradually decreases, and the guide rail 10 is clamped by the wedge effect. A frictional force acts between the guide rail 10 and the wedge-shaped members 3a and 3b, so that the car 1 is gradually decelerated and stopped. The radius of the cam 24 gradually decreases, and the roller 25a moves to the vicinity of the minimum radius position 24c according to the movement of the car 1. The relative position between the roller 25a and the cam 24 also changes due to the change in the frictional force acting between the guide rail 10 and the wedge-shaped movable members 3a and 3b.

  At this time, the return mechanism operates as follows. When the cam 24 and the support shaft 23 rotate in the y24 direction (left rotation), the left swash plate 6 also rotates left together. When the left swash plate 6 rotates, the right swash plate 13 in contact with the sphere 29 of the left swash plate 6 is pushed by the sphere 29 and slides on the support shaft 23 in the direction of the arrow y29 (left direction). Move to. However, the right swash plate 13 is prevented from rotating by the detent shaft 13a and does not rotate. The clutch 22 that holds the right swash plate 13 via the bearing 33 rotates synchronously with the support shaft 23 while moving straight along with the swash plate 13. The meshing portion 35 attached to the back side of the clutch 22 moved in the direction of the clutch receiver 28 meshes with the clutch receiver 28 with the meshing tooth inclined surfaces 22a and 28a serving as guides.

  In this meshing operation, even if the meshing teeth are not aligned with each other, the compression spring 30 provided between the clutch 22 and the meshing portion 35 acts so that the meshing portion 35 follows the clutch receiver 22. The operation of the stop mechanism 53 is not hindered. The driven pulley 20 attached to the clutch receiver 28 is stopped when meshing. Since the rotation direction is not restricted, it is easy to follow the rotation of the clutch 22 when engaged. As a result, the clutch 22 and the clutch receiver 28 can be reliably engaged with each other. The rotation direction y27 of the driven pulley when the clutch 22 is engaged is opposite to the rotation direction y25 of the support shaft 14b of the drive pulley 15 when the car 1 is lowered. However, since the one-way clutch 16 is provided, the clutch 22 can be prevented from being broken.

  After the emergency stop mechanism 53 operates to stop the car 1, it is necessary to release the emergency stop mechanism 53 so that the car 1 can be raised and lowered. Details of the return operation will be described with reference to FIG. In order to release the emergency stop mechanism 53, the car 1 is raised. When the car 1 rises, the support shaft 14b of the governor 50 rotates (rotates counterclockwise) in the direction of the arrow y28 opposite to the rotation direction y27 when the clutch 22 is engaged. When the car 1 is raised, the one-way clutch 16 transmits the rotation of the support shaft 14b to the drive pulley 15, so that the rotation is also transmitted from the drive pulley 15 to the driven pulley 20 via the belt 19. When the driven pulley 20 rotates, the clutch 22, the clutch 22, and the cam 24 that mesh with the clutch receiver 28 also rotate in the same direction.

  When the cam 24 rotates, the sphere 29 of the left swash plate 6 that has been in contact with the right swash plate 13 moves to the left in the axial direction. The right swash plate 13 pushed by the sphere 29 is pulled to the left by the pulling force of the tension spring 34 provided on the outer peripheral portion of the swash plate 13 instead of the pressing force from the sphere 29. As a result, the right swash plate 13 and the clutch 22 move in the arrow y30 (left direction).

  The rotation direction of the cam 24 in this returning operation is a direction y24 (left rotation) when the emergency stop mechanism 53 is activated. As the cam 24 rotates, the cam 24 contacts the roller 25a of the cam latch mechanism 54 at a position where the radius of the cam 24 gradually increases. The roller 25a gradually moves downward as the cam 24 rotates. Since the roller 25a has moved downward, the compression spring 5 held on the lifting rod 25 is compressed. At the same time, the wedge-shaped movable members 3a and 3b attached to the lower portion of the lifting rod 25 are also gradually moved downward, and the frictional force with the guide rail 10 is released.

  When the car 1 further rises, the clutch receiver 28 and the clutch 22 are not engaged and become free. In this state, the relationship between the rotation amount of the cam 24 and the movement amount of the clutch 22 is determined so that the roller 25a passes through the maximum radial position cam 24d of the cam 24. When the roller 25d passes the maximum radial position 24d of the cam 24, the cam 24 automatically returns to the normal position 24a by the return force of the compression spring 27 of the emergency stop mechanism 53. As a result, the lifting rod 25, the compression spring 5, and the wedge-shaped movable members 3a and 3b return to their initial positions and return to the steady state before the emergency stop operation shown in FIG. Here, since the clutch receiver 28 and the clutch 22 are not engaged and the engagement is completely free, even if the car 1 is further raised, the clutch receiver 28 rotates but the cam 24 does not rotate.

  According to the present embodiment, since the safety device of the elevator apparatus has a one-way clutch and a mechanism having a swash plate and a clutch, the frictional force acting on the guide rail and the belt after the emergency stop operation is used as the driving force. Can be automatically restored.

  Another embodiment of the safety device of the elevator apparatus 100 according to the present invention is shown in FIGS. Since the speed control part 52 is the same as that of the said Example, it has shown with the perspective view except the speed control part 52 in FIG. FIG. 6 is a diagram for explaining the operation of this embodiment. This embodiment is different from the above embodiment in that the power transmission to the return mechanism 55 is changed to a gear train 36 to 38 instead of the belt. Here, the gear 38 attached to the support shaft 23 is an intermittent gear in which some of the plurality of teeth formed on the outer peripheral portion are missing.

  A drive gear 36 is attached to the support shaft 14 b of the governor 50 via the one-way clutch 16. The drive gear 36 is engaged with a driven gear 37 that rotates in a driven manner. An intermittent gear 38 attached to the support shaft 23 of the cam 24 meshes with the driven gear 37. The one-way clutch 16 is set to transmit the driving force when the car 1 is lifted, as in the above embodiment. When the emergency stop mechanism 53 is not operating, the intermittent gear 38 position is set so that the driven gear 37 comes to the normal position where the teeth of the intermittent gear 38 are missing.

  FIG. 6 schematically shows the emergency stop mechanism 53, the cam latch mechanism 54, the return mechanism 55, and the speed detector 51 of the governor. FIG. 6A shows a normal state before the emergency stop mechanism 53 operates. When the car 1 (not shown) descends, the rotating shaft 14b to which the drive gear 14b is attached rotates in the direction of arrow y2 (right direction). Since the speed of the car 1 does not exceed the set speed limit, the cam 24 is kept in contact with the roller 25a near the apex near the notch 24b. The wedge-shaped movable members 3 a and 3 b of the emergency stop mechanism 53 are not in contact with the guide rail 12.

  Since the power of the rotating shaft 14b is not transmitted to the drive gear 36 by the one-way clutch 16, the drive gear 36 is stopped. Therefore, the driven gear 37 and the intermittent gear 38 are also stopped. The intermittent gear 38 is opposed to the driven gear 37 at a portion without teeth that does not mesh with the driven gear 37.

  When the descending speed of the car 1 exceeds the set speed limit, the governor 50 strikes the cam 24 and rotates the cam 24 in the direction of the arrow y3 (left rotation). The lifting rod 25 held by the cam 24 is pulled up, and the wedge-shaped movable members 3a and 3b of the emergency stop mechanism 53 stop the car 1 with the guide rail 10 interposed therebetween.

  When the cam 24 rotates counterclockwise, the intermittent gear 38 of the gear train also rotates in the direction of the arrow y6 (rotates counterclockwise), and the intermittent gear 38 rotates where the teeth are formed from the missing portion where the teeth are missing, and is driven. Engage with the gear 37. As a result, the driven gear 37 rotates (rotates clockwise) in the direction of the arrow y5, and the drive gear 36 that meshes with the driven gear 37 rotates (rotates counterclockwise) in the direction of the arrow y4. Here, the rotation direction of the drive gear 36 is opposite to the rotation direction of the support shaft 14b. However, since the drive gear 36 is attached to the support shaft 14b via the one-way clutch 16, no problem occurs.

  FIG. 6C shows the state of the safety device when the emergency stop mechanism 53 is activated and the car 1 of the elevator apparatus 100 is stopped. The cam 24 is stopped after being rotated by a predetermined amount. As a result of the lifting rod 25 pulling up the wedge-shaped movable members 3 a and 3 b upward, the wedge-shaped movable members 3 a and 3 b are accommodated inside the fixed member 2. The car 1 is stopped by holding the guide rail 10 from both sides. The intermittent gear 38 meshes with the driven gear 19.

  Since the emergency stop mechanism 53 is activated and the car 1 is once stopped, the car 1 needs to be moved. The state during the return operation of the car 1 is shown in FIG. When the car 1 rises, the support shaft 14b and the drive gear 36 rotate (rotate counterclockwise) in the directions of arrows y7 and y8. With the driving force transmitted from the driving gear 36, the intermittent gear 38 also rotates (rotates counterclockwise) in the direction of the arrow y10. When the intermittent gear 38 rotates, the cam 24 attached to the support shaft 23 of the intermittent gear 39 also rotates (rotates counterclockwise) in the arrow y11 direction. Thus, when the cam 24 rotates counterclockwise, the radius of the cam 24 gradually increases. The lifting rod 25 is gradually pushed down as the cam 24 rotates, and the compression spring 5 held by the lifting rod 25 is compressed. At this time, the wedge-shaped movable members 3 a and 3 b are also gradually pushed down and separated from the guide rail 10.

  When the car 1 further rises, the driven gear 37 is opposed to the tooth missing portion of the intermittent gear 38, the driven gear 37 is idled, and the intermittent gear 38 stops rotating. In this state, the tooth missing portion of the intermittent gear 20 is set so that the roller 25a passes through the maximum radial position 24d of the cam 24. The cam 24 automatically returns to the steady position 24a located in the vicinity of the notch 24b. Therefore, power transmission from the driven gear 37 to the intermittent gear 38 is completely stopped. Thereby, all the safety devices of an elevator apparatus return to a steady state. Since the vehicle has returned to the steady state, even if the car 1 further rises, the cam 24 does not rotate any further. According to the present embodiment, since the intermittent gear that can transmit the rotational motion within a predetermined range of the one-way clutch and the rotation angle is used, the safety device can be automatically returned with a simple configuration.

  Still another embodiment of the safety device of the elevator apparatus 100 according to the present invention will be described with reference to FIGS. 7 is a perspective view of the safety device corresponding to FIG. 6, and FIG. 8 is an operation explanatory view of the safety device corresponding to FIG. In this embodiment, the power of the drive gear 39 attached to the other end of the support shaft 14b that holds the pulley 11e of the governor 50 at one end is directly transmitted to the rack 40 attached to the lifting rod 25. However, this is different from the above embodiments.

  A rack 40 extending in the ascending / descending direction is attached to the spring receiving upper plate 26 attached to the lifting rod 25. The drive gear 39 is disposed at a position away from the rack 40 by a predetermined distance. A one-way clutch 16 is attached to the drive gear 39. A tension spring 41 is attached near the top of the notch 24b of the cam 24 to hold the cam 24 back to the steady state position after the emergency stop mechanism 53 is activated. The other end of the tension spring 41 is fixed to the car 1 side.

  FIG. 8A shows a steady state, FIG. 8B shows a state during operation of the emergency stop mechanism 53, and FIG. 8C shows the emergency stop mechanism 53 operating to stop the car 1 of the elevator apparatus 100. FIG. 4D shows a return state in which the elevator apparatus 100 is restarted and the car 1 is gradually raised. Since the one-way clutch 16 is attached to the support shaft 14b, the emergency stop mechanism 53 operates when the speed of the car 1 exceeds. At that time, the cam 24 is first hit by the pendulums 9 and 17 of the governor 50 and rotates (rotates counterclockwise) in the direction of the arrow y14. The power of the drive gear 39 is transmitted to the rack 40 along with the rotation y14 of the cam 24. At this time, the support shaft 14b and the drive gear 39 rotate y13 and y15 (right rotation) in the same direction. The rotational directions of the drive gear 39 and the support shaft 14b are the same, but the rotational speeds of the drive gear 39 and the support shaft 14b are generally not the same as the descending speed of the car 1 and the opening response speed of the compression spring 5. However, since the drive gear 39 is connected to the support shaft 14b via the one-way clutch 29, the drive gear 39 and the support shaft 14a can absorb this difference. The rack 40 is driven, and the emergency stop mechanism 53 operates. The tension spring 41 is extended by the rotation of the cam 24.

  When the emergency stop mechanism 53 holds the guide rail 10 and stops the car 1, the emergency stop mechanism 53 is released in order to return the elevator to normal operation. Similar to the above embodiments, the car 1 is gradually raised. When the car 1 rises, the support shaft 14b and the drive gear 39 rotate (rotate counterclockwise) in the arrow directions y16 and y18. The lifting rod 25 to which the rack 40 is attached moves downward. The cam 24 gradually returns to the steady position by the spring force of the tension spring 41 as the pulling rod 25 descends. The wedge-shaped movable members 3a and 3b are pushed down, and the friction with the guide rail 10 is eliminated.

  When the car 1 further rises, the drive gear 28 leaves the rack 30 and idles. At this time, the cam 24 is returned to the steady position 24 a by the spring force of the spring 41. Similarly, each part of the safety device also returns to the steady state and returns to the state shown in FIG. Here, in order to prevent the cam 24 from returning too much, the cam 24 forms a wall by enlarging the recess at the steady position 24a as shown in the figure. Since the rotation range of the cam 24 does not reach 360 degrees, it is not necessary to gradually change the radius of the cam 24 that was necessary for the cam 24 of each of the above embodiments.

  According to the present embodiment, the one-way clutch and the rack that meshes with the gear within a predetermined range are used, and the emergency stop mechanism is directly restored, so that the cam shape can be easily designed.

  Still another embodiment of the safety device for an elevator apparatus according to the present invention is shown in a perspective view in FIG. In each of the above embodiments, the governor uses centrifugal force, but in this embodiment, electromagnetic force is used. In the speed control unit 57 using electromagnetic force, a copper disk 49 that rotates in synchronization with the pulley 11f is attached to the other end of the support shaft 14a to which the pulley 11f of the speed governor 50 is attached on one end side. A plurality of magnets 44 are arranged to face the side surface of the disk 49 at a predetermined interval. The magnet 44 is held inside the frame-shaped magnet attachment member 43. A shaft 48 is attached to the side surface of the frame-type magnet attachment member 43 on the side opposite to the pulley 11 f, and a cam 46 and an intermittent gear 38 are attached to the shaft 48. The magnet attachment member 43 is rotatably supported and rotates in synchronization with the cam 46. One end of the spring 45 is attached to the magnet attachment member 43 and restrains the rotation of the magnet attachment member 43. The spring 45 returns the magnet attachment member 43 to the reference position when the disk 49 is not rotating.

  In the speed governor using the electromagnetic force configured as described above, when the car 1 descends, the disk 49 attached to the support shaft 14a of the pulley 11f also rotates. When the disk 49 rotates, an eddy current is generated in the disk 49 by the magnetic force of the magnet 44 disposed opposite to the disk 49. On the other hand, an eddy current generated in the disk 49 generates a magnetic drag force that prevents the rotation of the disk 49 in the magnet 44. The magnetic drag is proportional to the rotational speed of the disk 49. An attractive force in the rotational direction of the disk 49 acts on the magnet 44, and the magnet mounting member 43 rotates about the shaft 48 in the same direction as the disk 49. Since the spring 45 is attached to the magnet attachment member 43, the magnet attachment member 43 stops at an angle where the magnetic drag and the resistance force of the spring 45 are suspended.

  If the angular displacement from the reference position of the magnet mounting member 43 is measured, the speed of the car 1 can be measured. The reference position is a position where the car 1 is in a stopped state where the disk 49 is not rotationally displaced. Since the cam 46 is attached to the rotation shaft 48 of the magnet attachment member 43, it rotates by an angle corresponding to the rotational speed of the disk 49. When the car 1 exceeds the set speed limit, the cam 46 is released and the emergency stop mechanism 53 is activated. The return mechanism 47 is the same as that of the embodiment shown in FIG. In each of the above embodiments, the speed detector 51 of the governor 50 is configured by a plurality of pulleys 11a to 11f and a belt 12 that spans the pulleys 11a to 11f, and the belt 12 contacts the guide rail 10. However, the pulleys 11 a to 11 f may be directly pressed against the guide rail 12.

1 is a perspective view of an embodiment of an elevator apparatus according to the present invention. It is a longitudinal cross-sectional view of a part of a safety device mounted on the elevator apparatus shown in FIG. It is a front view of the cam which the safety device shown in FIG. 2 has. It is a figure explaining operation | movement of the safety device shown in FIG. It is a perspective view of the safety device carried in the elevator apparatus shown in FIG. It is a figure explaining operation | movement of the other Example of the safety device mounted in the elevator apparatus which concerns on this invention. It is a perspective view of the further another Example of the safety device mounted in the elevator apparatus which concerns on this invention. It is a figure explaining operation | movement of the safety device shown in FIG. It is a perspective view of the further another Example of the safety device mounted in the elevator apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Car, 3a, 3b ... Wedge-shaped movable member, 4 ... Drive connection switching mechanism, 6 ... Swash plate, 9 ... Pendulum, 10 ... Guide rail, 11a-11f ... Pulley, 13 ... Swash plate, 15 ... Drive pulley, 16 ... one-way clutch, 18 ... pendulum, 20 ... driven pulley, 22 ... clutch, 24 ... cam, 25 ... lifting rod, 28 ... clutch receiver, 35 ... meshing part, 40 ... rack, 43 ... magnet mounting member, 44 ... magnet, 49 ... A disk.

Claims (11)

  An emergency stop mechanism that generates frictional force between the governor that detects the speed of the elevator device and the guide rail that guides the car, and this emergency stop mechanism operates when the governor detects an abnormal speed And a return device for releasing the emergency stop mechanism and returning the cam latch mechanism to a predetermined position after the elevator mechanism has been actuated and the elevator car has stopped. A safety device for an elevator apparatus, wherein the driving force generated by the speed governor can be transmitted to the cam latch mechanism only when the car is raised after the mechanism is operated.   The said return device is provided with the one-way clutch which does not transmit the motive power of a governor to the cam of a cam latch mechanism at the time of a fall, and the clutch which cancels | releases as a coupling | bonding with the said cam raises. Elevator equipment safety device.   The return device includes a one-way clutch that does not transmit the power of the governor to the cam of the cam latch mechanism when descending, and a power unit that is connected to the cam and has a gear train, and the gear train has an intermittent gear. The safety device for an elevator apparatus according to claim 1.   When the speed governor detects that the car is operating above a preset limit speed, it drives the cam latch mechanism to activate the emergency stop mechanism, and the emergency stop mechanism holds the guide rail to stop the car. After the car stops, the cam latch mechanism is operated using the return device. When the car is lowered, the return mechanism is connected to the cam of the cam latch mechanism, but it is idled without transmitting power, and after the emergency stop operation An elevator apparatus operating method, wherein a return mechanism is not connected to a cam of a cam latch mechanism when the car is raised except when the car is raised.   A speed governor attached to the elevator car that moves up and down the hoistway to detect the speed of the car, an emergency stop mechanism that holds the guide rail extending in the vertical direction of the hoistway, In a safety device for an elevator apparatus provided with a cam latch mechanism that activates the emergency stop mechanism when a predetermined limit speed is exceeded, power generated between the speed governor and a guide rail is used as a drive source, and the cam latch mechanism A safety device for an elevator apparatus, wherein a return mechanism is provided between the speed governor and the cam latch mechanism to return the cam latch mechanism from the active state to the non-operated state after the engine is changed from the inactive state to the active state.   6. The elevator apparatus according to claim 5, wherein the return mechanism includes a drive mechanism that abuts on the guide rail and generates a rotational drive force, and a connection mechanism that connects the drive mechanism and the cam latch mechanism. Safety equipment.   7. The return mechanism includes a transmission element switching unit that transmits a rotational driving force only when the car is raised, and an intermittent drive transmission unit that allows the driving force to be transmitted only when the cage is rising. The safety device of the elevator apparatus as described in.   The intermittent drive transmission means includes a swash plate that converts rotational motion into translational motion, and the swash plate reciprocates between a plurality of rotating members including a cam and a clutch provided coaxially. The safety device of the elevator apparatus of Claim 7.   The safety device for an elevator apparatus according to claim 7, wherein the intermittent drive transmission means includes an intermittent gear or a rack having a portion having no meshing teeth.   The safety device for an elevator apparatus according to claim 5, wherein the return mechanism rotates the cam of the cam latch mechanism in one direction to return the emergency stop mechanism and the cam latch mechanism.   The elevator apparatus according to claim 5, further comprising a connection member that connects the cam latch mechanism to an emergency stop mechanism, and the return mechanism uses the connection member to return the emergency stop mechanism and the cam latch mechanism. Safety equipment.

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