FI120939B - Speed limiter for a lift and elevator - Google Patents

Description

FIELD OF THE INVENTION

The invention relates to a speed limiter as defined in the preamble of claim 1 and to an elevator as defined in the preamble of claim 12.

BACKGROUND OF THE INVENTION

Conventionally, the elevator is equipped with a safety device which is triggered by triggering the speed limiter. 10 A common solution is that when the speed of the elevator reaches the preselected limit on the speed limiter, the speed limiter triggers the clamping device via the same rope through which the speed limiter follows the speed of the elevator. The structure and function of one of these 15 speed limiters is described in US4653612. In conjunction with the speed limiter, there is a switch that cuts off the power supply to the elevator motor at a speed slightly lower than the trigger speed. In addition to the elevator sticking in 20 overspeed situations, there are situations where the gripper device should be triggered even if the elevator speed does not exceed the permitted speed. These situations include, for example, testing the grasping device during the inspection of the elevator or stopping the elevator by means of the grasping device 25 if the elevator moves from the floor level with the doors partially or fully opened.

US2007 / 0181378A1 and FI94948B disclose solutions in which the speed limiter can be stopped by 30 separate actuators and thus release the label regardless of the speed of the speed limiter wheel. Other solutions are also known.

Prior art solutions include e.g. 35 problem that they are not able to function well as an anticreep device. Especially the loading situation of the elevator car would cause problems, as the docking of the elevator car during loading could trigger the catcher. It is also known to have a problem that the 5 actuator structure added to the speed limiter has been bulky and complex.

Prior art is further disclosed in EP1088782B1, which attempts to solve some of the above problems. One problem 10 of the solution shown is e.g. the fact that the coupling between the speed limiter wheel and the engaging part is not easy to make based on shape locking, nor is it easy to adapt the solution to the coupling structure for longevity and reliability.

15

PURPOSE OF THE INVENTION

The object of the invention is to eliminate e.g. the aforementioned drawbacks of known solutions. The object of the invention is to provide e.g. one or more of the following benefits: 20 - A speed limiter is achieved that is well suited for anticreep.

A compact speed limiter is achieved, the size of which, particularly in the radial direction, can be kept compact.

25 - A speed limiter is achieved that is reliable, simple and easy to maintain.

- A speed limiter is reached that can be triggered remotely.

A speed limiter is reached, which can act as a 30 unintended movement detector / stopwatch.

A speed limiter is achieved which works well regardless of the direction of rotation of the speed limiter wheel.

A speed limiter / elevator is achieved with 35 adjustable features.

A speed limiter is achieved which is well suited for modernization as it is suitable for different types of 3 lifts, such as counterweights and counterweights.

An elevator is obtained which does not necessarily require a separate anti-creep device and / or an unintended 5 movement detector.

- A lift is achieved which functions well regardless of the direction of travel of the elevator car.

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SUMMARY OF THE INVENTION

The speed limiter according to the invention is characterized by what is stated in the characterizing part of claim 1. The elevator 15 according to the invention is characterized by what is presented in the characterizing part of claim 12. Other embodiments of the invention are characterized by what is set forth in the other claims. Inventive embodiments are also disclosed in the specification and drawings of this application. The inventive content contained in the application may also be defined otherwise than as set forth in the claims below. The inventive content can also consist of several separate inventions, especially if the invention is considered in the light of the express or implied subtasks or the benefits or groups of benefits achieved. In this case, some of the attributes contained in the claims below may be redundant for the discrete inventive ideas. Aspects of various embodiments of the invention may be applied in conjunction with other embodiments within the scope of the inventive concept.

According to the invention, the speed limiter comprises a body, a speed limiter wheel supported by a frame 35, and means for slowing the speed limiter wheel rotation speed, which means comprises a coupling part movable with respect to the speed limiter wheel disposed between at least the speed limiter wheel In the engaged position, the clutch member 5 is arranged to move by the movement of the speed limiter wheel, and the speed limiter further comprises means for slowing the movement of the clutch member moved by the speed limiter to retard the speed limiter wheel. The coupling member 10 comprises a stop member for transmitting to the coupling member a force retarding force of the coupling member and a part engaging the speed limiter wheel in the engaged position, and having a frictional joint between the stop member and the part engaging the speed limiter wheel. An advantage of the invention is, inter alia, that the speed limiter 15 is well suited as an anti-creep device which can be switched on when the elevator stops. It also has the advantage that the deceleration does not have to be applied directly to the speed limiter wheel. Thus, for example, engaging in motion does not produce a strong impact 20 directly on the speed limiter wheel. An additional benefit is the longer life of the parts. In addition, the retaining member must also be removable, the advantage being e.g. that the worn response part can be replaced.

In one embodiment of the invention, the coupling member is arranged to be movable in axial direction of the speed limiter wheel between a position coupled to the speed limiter wheel and a position separate from the speed limiter wheel. This has several benefits. The speed limiter can be arranged, inter alia, if desired, so that the decelerating force 30 can be easily applied symmetrically to the speed limiter wheel without being subjected to radial forces. It is also possible, if desired, to obtain, by simple arrangements, a large and evenly distributed contact area between the coupling part and the speed limiter wheel. The susceptibility to breakage of the parts 35 remains so low. This is particularly advantageous when coupled to a speed limiter wheel in motion. The speed limiter can also be kept small in the z-direction.

5

In one embodiment of the invention, when in a engaged position, the coupling member is arranged to move by a rotational motion of the speed limiter wheel 5 for a predetermined distance before the means for slowing the movement of the speed limiter wheel actuated member begin to slow the movement of the coupling part. The advantage is e.g. that there is room for maneuver for lift lifters not yet triggered.

10

In one embodiment of the invention, the speed limiter comprises second means for slowing down the speed of the speed limiter wheel, the second means being preferably arranged to be activated by centrifugal principle 15 depending on the speed of the speed limiter wheel.

In one embodiment of the invention, the speed limiter comprises means, preferably a solenoid, for moving the coupling part between the position coupled to the speed limiter wheel and 20 positions apart from the speed limiter wheel.

In one embodiment of the invention, the speed limiter comprises means for detecting movement of the coupling member with the speed limiter wheel and / or determining the travel distance 25.

In one embodiment of the invention, the coupling member comprises a portion which is disc-shaped and adapted to move with the coupling member engaged in engagement with the speed limiter wheel. The advantage is e.g. wide switchgear industry.

In one embodiment of the invention, the coupling member is axially supported with respect to its center of gravity for positioning the coupling member in a position separate from the speed limiter wheel.

In one embodiment of the invention the engagement of the coupling part and the speed limiter wheel is arranged on a 6 shape locking principle, preferably a recess-protrusion type.

In one embodiment of the invention, the coupling member is arranged to move in a engaged position by coaxially rotating with a speed limiter wheel.

In one embodiment of the invention, the speed limiter wheel comprises means for transmitting the movement of the elevator car to the speed limiter wheel 10, such as a rope groove.

According to the invention, the elevator comprises at least an elevator car arranged to reciprocate substantially vertically, preferably along rails, and a sticker device disposed in connection with the elevator car 15, and at least one speed limiter having at least a speed limiter wheel preferably by means of a speed limiter rope rotating the flywheel and the no-20 speed limiter wheel. The speed limiter is one of those described above. Advantages include: that the lift does not necessarily require a separate anti-creep device and / or unintended movement detector.

25

In one embodiment of the invention, the coupling part is arranged to be in a position separate from the speed limiter wheel during normal travel of the elevator.

In one embodiment of the invention, the coupling member is arranged with the elevator level to be engaged.

LIST OF FIGURES

The invention will now be described in more detail by means of 35 exemplary embodiments with reference to the accompanying drawings, in which:

Figure 1 is a three-dimensional view of the speed limiter of the invention.

Figure 2 is an exploded view of the speed limiter 5 of Figure 1 in three-dimensional view.

Figure 3 is a partial view of the speed limiter of Figure 1 in three-dimensional view.

Figure 4 shows an elevator according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

Figure 1 illustrates a speed limiter 8 according to the invention. Figures 2 and 3 show, for clarity, parts of the speed limiter 8 according to Fig. 15 1, apart.

The speed limiter comprises a body 1 which carries a speed limiter wheel 2 rotatable with respect to the body 1. The speed limiter further comprises means (3,4) for slowing down the speed of rotation of the speed limiter wheel 2 by which the speed of the speed limiter wheel 2 can be slowed down and preferably even stopped.

The purpose of decelerating the speed limiter wheel in lifts is to normally change the ratio of the speed of the elevator car to the circumferential speed of the speed limiter, which may cause the catcher in the elevator car to release, for example. Generally, the speed limiter is mounted on the end of the elevator 30 shaft and the movement of the elevator car is transmitted to the speed limiter by a rope attached to the elevator car which rotates the speed limiter wheel and an impeller mounted on the opposite end of the elevator shaft. The rope is connected to a gripper in the elevator car and adapted to pull the 35 speed limiter wheels while retaining the wedge attached to the elevator car against the guides of the elevator car.

What is essential for the operation of the speed limiter of the present invention is how the speed and / or the clearance of the speed limiter wheel 2 is affected. The speed limiter of the invention 5 is suitable for use in, for example, an arrangement as defined above. The means (3, 4) are adapted to retard and at most even

stop speed limiter wheel 2. They comprise a speed limiter pulley 2 with respect to movable held 10 of the coupling part 3, which is arranged to move at least the speed limiter pulley 2 coupled position A and the speed limiter pulley spaced from the position O (Figure 2 indicated direction stations O-A

between). In engaging position A, the coupling member 3 engages the speed limiter wheel 2 and is arranged to move by its rotational motion. In position O, the coupling part 3 is disengaged with the speed limiter wheel relative to the body portion 1 in a stationary position on the shaft 22, which axis 22 is preferably common to the speed limiter wheel 20. The support member 17, movably attached to the body part 1, serves as a positioner for the coupling part 3 in the x direction. The means (3, 4) for slowing the speed limiter wheel comprises means (4, 5) for slowing the movement of the coupling part 3 moved by the speed limiter wheel 2. Thus, the rotation of the speed limiter wheel 2 can be retarded, and preferably even stopped, by the coupling part 3 engaged in position A engaged with it. Said means (4,5) comprise a stop 4 supported on the body part and a stop 5 belonging to the coupling part 3 which is adapted in the engaged position A to move towards the stop 4 and to collide therewith if the speed limiter wheel rotates sufficiently. The distance between the stops 4 and 5 makes it possible to control the length of the spin 35 prior to deceleration of the speed limiter wheel. Thus, the means (4, 5) for slowing the movement of the speed limiter 2-actuated coupling part 3 are adapted to slow the movement of the coupling part 3 only after the coupling part rotates by a certain predetermined distance 9 speed limiter wheel 2. Between engaging and deceleration of clutch member 3, the clutch member is preferably allowed to rotate without being limited by the speed limiter wheel. The speed limiter according to the invention can be used as an anti-creeping device due to the above-described substantially free movement. For example, when the elevator car is loaded with the speed limiter engaged, the elevator car has a predetermined amount of dip, which the car can sink before the speed limiter releases the gripper and prevents further damage. Similarly, creep upwards is preventable, which is important especially in counterweight lifts. The distance of the responses can be adjusted by moving the response 4. It is clear that the distance can also be set to nearly zero, but it is preferred that the distance produce a rotation of 25-90 degrees, most preferably 25-60 degrees. Most preferably, the dash margin is arranged to allow the elevator car to dip 70 mm. This dash margin is preferably available in the direction of motion of each of the 20 lift car bodies, i.e. in both directions of rotation of the speed limiter wheel. In addition, the response 4 may serve as a jumper. In the figure, the stop 4 is a separate piece, but if desired it can also be constructed as a fixed part of the body 1, for example in Figs.

Movement of the coupling part 3 between position O and A can be effected, for example, by means of a solenoid 9 arranged through a support part 17 to move the coupling part 3 in the x direction. In the figures, this is implemented in the body part 1 on the shaft 18 by means of a movably supported support part 17. The shaft 18 is supported by the part 24 attached to the body part 1. When the support member 17 is wedged by the solenoid 9 around the axis 18 35, it provides the coupling member 3 with force / movement in the direction x. For safety reasons, it is advantageous to adapt the coupling part 3 so that in order to keep it in position 0, the solenoid 9 must be pulled by your electric force against some electricity independent force. The coupling part 3 is arranged to aim toward position A in the embodiment shown in Figs. 1-3 by utilizing gravity by positioning the folding shaft 18 at a distance from the center of gravity of the support member 17 in the direction of the speed limiter wheel. In addition or alternatively, magnetism or a spring placed between the body 1 and the coupling part 3, against which the solenoid in position 0 pulls, may be used to generate the coupling force.

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The speed limiter further preferably, but not necessarily, comprises means (11, 13, 15) for engaging the coupling member 3 with the speed limiter wheel 2 and / or to determine the length of the travel distance. This is accomplished in Fig. 1-3 by moving the stop 13 movably supporting the stop 13 to the stop 5's movement path. The stop 13 is connected to the stop 15 having a sensor 11 in its trajectory. Thus, when the coupling part 3 moves sufficiently, the stop 5 hits the stop 13 which moves with the stop 5 and moves the stop 15 which triggers the sensor 11. The stop 5 is adapted to hit the stop 13 4. This way the movement information is transmitted to the elevator control before the rotation of the speed limiter wheel 2 is influenced by the response 4 and the sticker may still need 25 steps to avoid. The device can thus be used as an unintended movement detector. These actions may include actuating the drive wheel or, for example, actuating a separate brake device such as a guide brake.

The coupling between the speed limiter wheel 2 and the coupling part 3 is implemented in Figures 1-3 in a form-locked manner. In form locking, the coupling part 3 and the speed limiter wheel 2 preferably comprise one or more groove-pair pairs (19,20), thereby providing a reliable connection 35. The grooves are preferably larger in the circumferential direction of the speed limiter than the projections, which increases the positioning certainty. The projections 19 are positioned in position A in the grooves 20 and correspond to the edges of the grooves 20 as the speed limiter wheel 2 moves, thereby also moving the clutch part 3. Alternatively, the engagement could be made, for example, magnetically or by friction. In Figure 1, the speed limiter is in the uncoupled position 0 so that the projections 19 are spaced from the grooves 20.

The coupling part 3 is preferably such that its center of gravity is at a distance from its center of rotation in its radial direction. Thus, the coupling member 10 is always gravitationally engaged in the same position when it is in position O. Most preferably, the coupling member is a body, for example a rotationally symmetrical body, from which a stop 5 with its supporting structures protrudes. In this way, the mass of the response moves the center point away from the center. Most preferably, the coupling member 3 is balanced so that the stop member 5 is centered in the direction of center of gravity. It is advantageous to install the speed limiter according to the invention in the position shown in Figs. 1-3 with the stop part 5 of the coupling part 3 facing downwards. The counter part 5 comprises two stop surfaces 20, whereby the device operates in both directions of rotation in the same way. For this reason, each stop surface of the stop member 5 is also preferably at the same distance from the stop 4 as it would hit upon rotation. The counter surfaces 5 and the stops 4 of the counter part 5 are thus arranged symmetrically in the direction x.

The speed limiter preferably comprises, but not necessarily, other means 7 for slowing down the speed of rotation of the speed limiter wheel 2. The second means 7 are preferably arranged mounted on the speed limiter wheel 2 and activated in some known manner, for example on a centrifugal principle, depending on the speed of rotation of the speed limiter wheel 2. In connection with the means 7 there is shown in the figures a sensor 23 for monitoring the state of the centrifugal means 7, the status information of which can be used to reduce the speed of the elevator when an overspeed condition is detected.

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The speed limiter wheel further comprises means for transmitting the movement of the elevator car to the speed limiter wheel, such as a rope groove 25. Through these means, the triggers can be transmitted to the grippers 5. The rope groove may be integrated in the structure of the speed limiter wheel 2 itself or in a part attached thereto.

The speed limiter further preferably, but not necessarily, comprises means for controlling the actuator 9 used to engage the coupling member, such as the solenoid shown. The means may be, for example, an electric control current of a solenoid. Preferably, the speed limiter further comprises means for receiving a wireless signal by means of which the control information can be fed to the speed limiter remotely. The wireless transmission can take place in some known way, such as electromagnetic radiation or acoustic signals. It is clear that information can also be transmitted along a cable if desired.

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The coupling part 3 can be formed as a single piece, but more preferably consists of a plurality of parts, most preferably as shown in Figures 1-3 (parts 5, 10, 21, 16). The part 10 which rotates in the engaged position A with the speed limiter wheel 2 is preferably connected to the stop part 5 so that there is at some point a frictional joint between them to improve the life of the parts. For example, the frictional joint may be between the part 21 fixed to the part 10 and the part 16 surrounding it. It is essential that the friction surfaces will not slip until a certain predetermined torque is exceeded, which torque is preferably higher than the torque required to release the grippers. Thus, the rotating member 10 may continue to rotate even after the movement of the stop member 5 is slowed to stop after colliding with the 35 stop 4. The deceleration of the speed limiter wheel releases the gripper, because the deceleration causes the rope or the like to decrease. Without the frictional joint, the stop 4 would slow the movement of the speed limiter wheel 2 through the coupling part 3 by stopping it in place as soon as the stop members 4 and 5 encounter.

The elevator according to the invention comprises a speed limiter of the kind described in this application, installed in an elevator system. Figure 4 illustrates an elevator according to the invention comprising an elevator car 26 and car rails 28. The elevator further comprises means for moving the elevator car such as, for example, ropes connected to the elevator car 10 and a traction sheave. The speed limiter wheel 2 of the speed limiter 8 is adapted to rotate as it is moved by the elevator car and is connected to the gripper apparatus 12 associated with the elevator car. Further, the rope 10 is preferably arranged to rotate the diverting wheel 27 in the elevator shaft or elsewhere in the building, thus the speed-20 denier wheel 2 rotates in accordance with the movement of the elevator car via the rope 10. Alternatively, the elevator according to the invention could operate so that the speed limiter 8 is mounted on the frame 1 to the elevator car and is connected to the elevator guide or one of the ropes in the elevator shaft 25 and obtains a rotational speed proportional thereto. For example, a lift rope or a rope stationary in a shaft can be used for this purpose. In this case, the stop 4 may be connected to a sticker in the basket which is triggered by the stop 5 colliding with the stop 4.

During normal travel, as the elevator car moves, the coupling part 3 is disengaged by the solenoid 9 from the speed limiter wheel 2, which can then rotate 35 freely. When using the speed limiter according to the invention as an anti-creeping device, the coupling part 3 is moved to position A by switching off the solenoid 9 when the basket stops, for example at a level. If, in this situation, the elevator car 14 moves in either direction, for example due to loading or roping, the movement of the coupling part 3, as described above, will result in a deceleration of the speed limiter wheel 5 and release of the velcro through the speed limiter rope.

The speed limiter described above can also be used to trigger the gliding of a moving elevator car by connecting the coupling part 3 to the moving speed limiter wheel 2 as a result of which the movement of the speed limiter wheel is slowed down and the adhesive is triggered. This allows the label to be released regardless of the speed of the speed limiter wheel. This may be desired, for example, in an emergency or when testing 15 speed limiters and / or adhesives.

Not all features, for example features 7, 11, 13, 15 and 23, are necessary for the operation of the invention. The invention can also be utilized as embodiments 20 in which the second stop means 7 are absent or different. The means 4 could also be different. The deceleration of the coupling part 3 could be accomplished, for example, by a magnet supported on the body, by a spring supported by the body, or by a slack cords secured between the body and the coupling member, allowing only a predetermined travel. Also, the presence of solenoid 9 is not necessary since at its simplest the device could be operated manually.

In the application, engagement of the clutch member 3 with the speed limiter wheel means that the clutch member directly or indirectly engages the speed limiter wheel 2 with other parts so that the motion of the speed limiter wheel is transmitted to the clutch member 3. Preferably the engagement is form 35 lockable. In a separate position A, the coupling part 3 is spaced apart from the speed limiter wheel so that the rotation motion of the speed limiter wheel is not transmitted to the coupling part 3. The term retardation is understood to include stopping.

It will be apparent to one skilled in the art that the invention is not limited to the embodiments described above, in which the invention is described by way of example, but many modifications and various embodiments of the invention are possible within the inventive concept defined in the claims below. Thus, it is clear 10 that the body 1 may consist of one or more parts. It is also clear that parts 2, 7 and 25 may be separate or integrated. It is essential that they move in a single structure.

Claims (13)

16 A speed limiter comprising a speed limiter wheel (2) rotatably supported by a frame (1), and means (3, 4) for slowing down the speed of rotation of the speed limiter wheel (2), comprising means (3) arranged to move relative to the speed limiter wheel (2). ), the coupling part (3) being arranged to move between at least the position (A) engaged with the speed limiter wheel (2) and the position (0) separate from the speed limiter wheel, in which the coupling part (3) is arranged to move by rotational movement of the speed limiter wheel , and which speed limiter further comprises means (4, 5) for slowing the movement of the clutch part (3) moved by the speed limiter wheel (2) for slowing the speed limiter wheel (2), characterized in that the clutch part (3) comprises a to move to the coupling part (3) and in position (A) the speed limiter wheel n (2) between the engaging portion (10), and the engaging portion 20 of the abutment part (5) and a speed limiter pulley (2) (10) is a friction connection. Speed limiter according to Claim 1, characterized in that the coupling part (3) is arranged to be movable between the position (A) connected to the speed limiter wheel (2) in the axial direction (x) and the position (0) separate from the speed limiter wheel. Speed limiter according to one of the preceding claims 1 to 2, characterized in that, when in the engaged position (A), the coupling part (3) is arranged to move by a rotational movement of the speed limiter wheel (2) a predetermined distance 35 before the means (4,5). to retard the movement of the displaced coupling part (3), they begin to retard the movement of the coupling part (3). 17 Speed limiter according to one of the preceding claims 1 to 3, characterized in that the speed limiter comprises second means (7) for slowing down the speed of rotation of the speed limiter wheel (2), which second means (7) are preferably arranged to be activated centrifugally depending on the speed of rotation. Speed limiter according to one of the preceding claims 1 to 4, characterized in that the speed limiter comprises means, preferably a solenoid (9), for moving the coupling part (3) to the position (A) connected to the speed limiter wheel (2) and 15 (O) ). Speed limiter according to one of the preceding claims 1 to 5, characterized in that the speed limiter 20 comprises means (11, 13, 15), a coupling part (3) for detecting movement with the speed limiter wheel and / or determining the length of the travel distance. Speed limiter according to one of the preceding claims 1 to 6, characterized in that the coupling part (3) comprises a part (10) which is disc-shaped and adapted to move in the engaged position (A) with the speed limiter wheel (2). 30 Speed limiter according to one of the preceding claims 1 to 7, characterized in that the coupling part (3) is supported on the shaft (22) eccentrically with respect to its center of gravity, for positioning the coupling part (3) in its position (0). Speed limiter according to one of the preceding claims 1 to 8, characterized in that the engagement of the coupling part 18 (3) and the speed limiter wheel (2) is arranged on a form-locking principle, preferably in the recess-protrusion type. Speed limiter according to one of the preceding claims 1 to 9, characterized in that the coupling part is arranged to move in the engaged position (A) by coaxial rotation with the speed limiter wheel (2). Speed limiter according to one of the preceding claims 1 to 10, characterized in that the speed limiter wheel (2) comprises means for transmitting the movement of the elevator car to the speed limiter wheel, such as a rope groove (25). 15 Elevator comprising at least an elevator car (26) arranged to travel reciprocally substantially vertically, preferably along rails (28), and a gripper device 20 (12) disposed in connection with the elevator car (26) and at least one speed limiter (8) comprising: at least a speed limiter wheel (2) adapted to rotate actuated by the elevator car and connected to a gripper device (12) associated with the elevator car, preferably via a rotational speed limiter rope (10) rotating the diverting wheel (27) and speed limiter wheel (2), characterized in that is according to any one of claims 1 to 11. Elevator according to claim 12, characterized in that the coupling part is arranged to be in a position (0) separate from the speed limiter wheel during normal travel of the elevator. 19