Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
  • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
  • B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
  • B66B5/04—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
  • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
  • B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
  • B66B5/16—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well
  • B66B5/18—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well and applying frictional retarding forces
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T24/00—Buckles, buttons, clasps, etc.
  • Y10T24/39—Cord and rope holders
  • Y10T24/3958—Screw clamp
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T24/00—Buckles, buttons, clasps, etc.
  • Y10T24/39—Cord and rope holders
  • Y10T24/3969—Sliding part or wedge
  • Y10T24/3978—Screw actuated

Definitions

• the invention relates to a device for preventing uncontrolled accelerations of a car of an elevator system both in the upward direction and in the downward direction.
• a car In elevator systems, a car is usually connected to a counterweight via a rope and a drive pulley, via which the drive takes place.
• a corresponding safety device is prescribed. Since the counterweight is usually designed in such a way that there is equilibrium at half the permissible payload of the car, uncontrolled acceleration can occur both in the downward direction and in the upward direction, depending on whether the half permissible payload of the car has been exceeded or fallen short of.
• the safety device must therefore respond both in the event of uncontrolled acceleration in the downward direction and in the upward direction.
• a device for preventing uncontrolled accelerations of a car in an elevator installation according to the preamble of claim 1 is known for example from EP 0 440 839 AI.
• the safety device resulting from this document responds both in the event of uncontrolled acceleration in the downward direction and in the upward direction.
• a limiter rope is provided which is independent of the drive rope and which runs endlessly over an upper deflection roller and a lower deflection roller.
• a weight is provided on the lower pulley to keep the governor rope taut at all times.
• At the top steering wheel is a speed limiter.
• the car is connected to the governor rope via an actuating lever, so that the governor rope is always carried along with the car when it is not disturbed and the speed of the upper pulley is therefore proportional to the speed of the car.
• the speed limiter detects the speed of rotation of the upper pulley and is designed so that when a limit speed of rotation of the upper pulley is exceeded, it blocks it, so that the upper pulley is stopped. Since the governor rope continues to be carried along with the car, the governor rope slips over a groove provided in the upper deflection pulley and experiences frictional resistance, so that a triggering force is transmitted to the trigger of the braking device via the governor rope.
• the brake device then responds and presses brake shoes against a guide rail of the elevator system, so that the car is braked and intercepted. Different brake shoes are provided for braking or intercepting the car in the downward or upward direction.
• the force which acts on the rope strand of the governor rope connected to the trigger is largely dependent on whether the car is moving in the downward direction or in the upward direction.
• the rope strand of the governor rope connected to the trigger pulls directly on the weight of the lower deflection roller when the elevator car moves upwards.
• the rope strand of the governor rope connected to the trigger pulls on the stationary upper deflection pulley by the weight of the lower pulley, so that in this case the force acting on the rope strand connected to the trigger increases considerably due to friction.
• the dimensioning of the safety device in particular the weight associated with the lower guide roller and the geometry of the keyway provided on the upper guide roller, over which the governor rope is pulled when the upper guide roller is stationary, must therefore be based on the braking process of the car when moving Orient upwards, since the release force is lower in this case.
• the invention has for its object to provide a device for preventing uncontrolled accelerations of a car of an elevator system, in which the triggering force introduced into the trigger of the braking device is limited.
• the trigger of the braking device to the limiter rope via a slip connection so that the limiter rope slips on the slip connection when a force is transmitted from the limiter rope to the trigger of the braking device which is considerably greater than that required to trigger the braking device Release force is.
• the maximum initiated triggering force limited and thus the trigger of the braking device and the governor rope protected against overload.
• the components of the device can be designed in such a way that, on the one hand, sufficient triggering force is generated to intercept acceleration of the car in the upward direction in order to reliably trigger the trigger of the braking device, but on the other hand the triggering force is limited when the car is intercepted in the downward direction, which prevents overloading of the trigger and the limiter rope.
• the slip connection can be set so that the
• the governor rope on the slip connection only slips in the downward direction when the car is braked. When the car is braked in the upward direction, the governor rope then slides over the fixed upper deflection pulley, as before, without triggering the slip connection according to the invention. Because of that
• Limiter rope as described when braking the car in the downward direction has a much greater force than when braking in the upward direction, it is sufficient that the slip connection slips in the downward direction.
• the slip connection can be set with a certain safety distance above the triggering force required to trigger the braking device.
• the slip connection can be arranged directly below the cable connector, which connects the free ends of the limiter cable to one another.
• the slip connection preferably consists of a base plate and a tension plate biased against the base plate with a predetermined tensioning force, the limiter cable being clamped between the base plate and the tensioning plate.
• At least one clamping screw is used to generate the clamping force, which extends through a hole in the clamping plate and can be screwed into a thread of the base plate. The screw-in depth and thus the clamping force is limited by a clamping stop.
• the clamping force can be generated from a clamping spring clamped between the base plate and a projection of the clamping screw, which preferably consists of a plurality of stacked plate springs.
• the clamping stop can be formed by a sleeve enclosing the clamping screw.
• the limiter rope is preferably guided on a surface of the base plate and / or the tensioning plate in a groove which has a preferably triangular cross-sectional contour.
• the groove opens preferably in an opening area which opens both in the direction of the surface and transversely to the surface of the base plate or the clamping plate.
• the trigger of the braking device is connected to either the clamping plate or the base plate.
• Figure 1 shows an embodiment of the device according to the invention in an overall view.
• Fig. 4 is a plan view of the slip connection
• FIG. 5 shows a section along the line AA in FIG. 4
• FIG. 6 shows a section along the line BB in FIG. 4;
• Fig. 8 is a side view of the base plate of the slip connection.
• Fig. 9 is a section along the line A-A in Fig. 8.
• FIG. 1 shows the device according to the invention for preventing uncontrolled accelerations of a car of an elevator system initially in an overall view.
• the support frame 2 of the car 1 is guided on an upper guide 3 and on a lower guide 4 on a guide rail 5, only indicated by the dashed line, along a vertical movement path.
• the car 1 is suspended on a conveyor cable, not shown, which is deflected at the upper end of the elevator shaft via a drive pulley and is connected to a counterweight.
• the elevator car is driven by the drive pulley.
• the counterweight is generally dimensioned such that the counterweight is in equilibrium with the car 1 when the car 1 is loaded with approximately half its maximum payload. In the event of a malfunction, in particular if the drive device fails, the car 1 can be accelerated in an uncontrolled manner on account of the weight difference between the car 1 and the counterweight.
• a braking device 6 which controls the uncontrolled acceleration both in upward and inward motion prevented in the downward direction and can be triggered by a trigger 7.
• a braking device of a similar type is known for example from DE 296 19 729 Ul and EP 0 825 145 AI and is only roughly described below.
• the trigger 7 consists of a rocker arm 9 articulated on a suspension 8 and a linkage 10 connected to the rocker arm 9, which acts on a turntable 12 mounted on a bearing 11.
• rocker arm 9 is tilted downward in FIG. 1 and linkage 10 is shifted downward.
• a second brake element 17 is brought into engagement with the guide rail 5, so that the guide rail 5 is clamped between the brake shoe 14 and the second brake element 17.
• the triggering of the trigger 7 of the braking device 6 takes place via a limiter rope 18, to which the car 1 is connected via the trigger 7 of the braking device 6.
• the limiter rope 18 is designed as a rope which runs endlessly around an upper deflecting roller 19 and a lower deflecting roller 20.
• a linkage 22 which is articulated on a bearing 23, onto the lower deflection roller 20 acting weight 21, the governor rope 18 between the upper pulley 19 and the lower pulley 20 is taut.
• the free ends 24 and 25 of the limiter rope 18 are connected to one another via a rope connector 26.
• a speed limiter 27 On the upper deflection roller 19 there is a speed limiter 27, which stops the upper deflection roller 19 when a predetermined rotational speed is exceeded, i. H. blocked.
• Such speed limiters 27 are known in different designs.
• the governor rope 18 When the elevator system is operating correctly, the governor rope 18 is carried uniformly with the elevator car 1 and the upper deflection roller 19 is in its unblocked state. Since the speed of the governor rope 18 corresponds to the speed of the car 1, the speed of rotation of the upper deflection roller 19 is proportional to the speed of the car 1. If the rotational speed of the upper deflection roller 19 exceeds a predetermined limit value, the speed limiter 27 blocks the upper deflection roller 19, so that the governor rope 18 is in sliding contact with the stopped upper deflection roller 19. As a result, a force component is exerted on the limiting rope 18, which it applies to the
• Triggers 7 of the braking device 6 transmits, which ultimately leads to the tripping of the braking device 6.
• Fig. 10 shows the force relationships on the governor rope 18 or on the upper deflection roller 19 and the lower deflection roller 20 for the case of Abbre sens the car 1 in the downward direction.
• Half of the weight force G / 2 of the weight 21 acts on the linkage 22 via the corresponding lever arm both on the left strand 18a of the limiter rope 18 and on the right strand 18b of the limiter rope 18. This is counteracted by a vectorially opposing counterforce G / 2 both in the left strand 18a and in the right strand 18b of the limiter rope 18. Furthermore, both the left strand 18a and the right strand 18b of the limiter rope 18 are acted upon by a rope weight force G s to be assigned to this strand. In this case, the governor rope 18 is pulled to the left over the upper deflection roller 19.
• the right-hand force on the fixed upper deflection roller 19 is given by the resulting force Si, which is composed of the cable weight force G s and the force G / 2.
• a correspondingly larger force S 2 acts on the left run 18a of the governor rope, which force is increased correspondingly by the friction on the groove of the upper deflection roller 19.
• a vectorial downward force Fj which results from the difference between the force S 2 and the rope weight force G s acting in the opposite direction and the force G / 2, can be used as the triggering force for triggering the braking device 6.
• FIG. 11 illustrates the conditions when the car 1 is braked in the upward direction.
• the governor rope 18 is pulled to the right over the fixed, upper deflection roller 19.
• the right-hand force Si is greater than the left-hand force S 2 on the upper deflection pulley 19.
• F 2 there is a vectorially upward force F 2 on the left strand 18a of the limiter cable 18, which can be used as a triggering force for the braking device 6.
• the weight force G acting on the lower deflecting roller 20 and the geometry of the groove of the upper deflecting roller 19 determining the relationship between the forces Si and S 2 must be dimensioned such that when the car 1 is braked in the upward direction, the triggering force F 2 still available is sufficient to safely trigger the braking device 6.
• a significantly greater triggering force Fx results, as illustrated in FIG. 10.
• the downward-acting force is obtained Tripping force Fi as a function of the tripping force F 2 effective above.
• a reliable triggering of the braking device 6 requires, for example, a triggering force of 400N and the weight 21 is dimensioned such that this 400N can be reached in the upward direction, a force of approx. 1550N is obtained for the triggering force in the downward direction F x, i.e. a force which is almost 4x as large as the upward release force F 2 .
• the present invention proposes to connect the trigger 7 of the braking device 6 to the limiter rope 18 to limit the force transmitted to the trigger 7 via a slip connection 30.
• the limiter rope 18 slips on the slide connection 30 12
• the slip connection 30 can be set such that it slips at 800N, for example. This represents a sufficient safety distance from the required trigger force of 400N and limits the trigger force otherwise occurring in the downward direction from 1550N to the aforementioned 800N.
• FIGS. 2 to 9. 2 shows the individual parts and their mounting position.
• Fig. 3 shows the fully assembled
• Slip connection 30 which is preferably mounted below the cable connector 26 on the limiting cable 18.
• the mounting position directly below the cable connector 26 has the advantage that an unlimited slide length is available when the slide connection 30 slips downward on the limiter cable 18.
• the slip connection 30 consists of a base plate 31, two tensioning screws 33, two tensioning springs 34, two sleeve-shaped tensioning stops 35 and assembly screws 36 Swivel lever 9 of the trigger 7 second discs 38 are interposed.
• a groove 40 on the base plate 31 for guiding the limiter rope 18.
• the groove 40 can of course alternatively also be formed on the tensioning plate 32 or both on the tensioning plate 32 and on the base plate 31.
• FIGS. 2 and 3 show one Top view of the slide connection 30, FIG. 5 shows a section along the line AA in FIG. 4 and FIG. 6 shows a section along the line BB in FIG. 4. Elements already described are provided with the same reference numerals in order to facilitate the assignment.
• the limiter cable 18 is clamped between the base plate 31 and the tensioning plate 32.
• a threaded shaft 50 of each clamping screw 33 is screwed into a thread 51 of the base plate 31.
• an associated tensioning spring 34 which in the exemplary embodiment shown consists of a plurality of stacked disc springs 53, is clamped between a screw head 52 of the associated tensioning screw 33 or between the washer 37 and the tensioning plate 32.
• the clamping force exerted by the tension spring 34 depends on the pretension and thus on the screwing depth of the threaded shaft 50 into the base plate 31.
• the screwing depth of the clamping screw 33 is limited by the clamping stop 35.
• the clamping stop 35 is designed as a sleeve, which surrounds the threaded shaft 50 of the respective clamping screw 33.
• a bore 54 is provided on the clamping plate 32, through which both the threaded shaft 50 of the clamping screw 33 and the sleeve-shaped clamping stop 35 engage.
• the sleeve-shaped clamping stop 35 is clamped between the screw head 52 or between the washer 37 and the surface 55 of the base plate 31.
• two clamping screws 33 are provided. Of course, only a single clamping screw 33 or three or more clamping screws 33 can be used within the scope of the invention.
• the clamping plate 32 has threaded bores 56 into which the mounting screws 36 can be screwed, so that the rocker arm 9 of the trigger 7 is connected to the clamping plate 32.
• the pivot lever 9 of the trigger 7 it is of course also possible to connect the pivot lever 9 of the trigger 7 to the base plate 31.
• the force with which the limiter cable 18 is clamped between the clamping plate 32 and the base plate 31 is defined in a defined manner by the defined prestressing of the tension springs 37.
• the pretensioning of the tensioning springs 37 can be metered precisely and reproducibly. This enables an exact and reproducible definition of the force between the limiter rope 18 and the trigger 7, when exceeded, the limiter rope 18 slips on the slip connection 30.
• FIG. 7 shows a top view of the base plate 31
• FIG. 8 shows a side view of the base plate 31 shown in FIG. 7
• FIG. 9 shows a section along the line AA in FIG. 8. Elements already described are to facilitate the assignment with matching reference numerals.
• FIG. 4 shows the groove 40 extending in the longitudinal direction on the surface 55 of the base plate 31, which opens out at the ends 60 and 61 of the base plate 31 in an opening area 62 and 63, respectively, which will be described in more detail.
• the preferred opening angle of 15 ° can be seen from the section along line AA in FIG. 8 which can be seen in FIG. 9 detect.
• the angle of attack of the two flanks of the triangular groove 40 is preferably approximately 90 °.
• the groove 40 can of course alternatively or additionally also be provided on the clamping plate 32.
• the rollers 19 and 20 can be used, for example, as synchronized rollers instead of as deflection rollers. and angled rollers can be formed.
• the slip connection 30 connected to the car 1 via the trigger 7 and the braking device 6 on the stationary limiter rope 18 both in the upward direction and in the downward direction after exceeding the for triggering the

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Maintenance And Inspection Apparatuses For Elevators (AREA)
• Cage And Drive Apparatuses For Elevators (AREA)
• Elevator Control (AREA)
• Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
• Forklifts And Lifting Vehicles (AREA)
• Braking Arrangements (AREA)
• Types And Forms Of Lifts (AREA)

Priority Applications (11)

Applications Claiming Priority (2)

Publications (1)

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ID=7897418

Family Applications (1)

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Citations (2)

Family Cites Families (17)

• 1999
  • 1999-02-12 DE DE19906073A patent/DE19906073C2/de not_active Expired - Fee Related
• 2000
  • 2000-02-09 CN CNB008032742A patent/CN1184129C/zh not_active Expired - Fee Related
  • 2000-02-09 ID IDW00200101970A patent/ID30321A/id unknown
  • 2000-02-09 EP EP00901469A patent/EP1150913B1/de not_active Expired - Lifetime
  • 2000-02-09 AT AT00901469T patent/ATE381510T1/de not_active IP Right Cessation
  • 2000-02-09 AU AU22753/00A patent/AU770329B2/en not_active Ceased
  • 2000-02-09 TR TR2001/02329T patent/TR200102329T2/xx unknown
  • 2000-02-09 DE DE50014860T patent/DE50014860D1/de not_active Expired - Lifetime
  • 2000-02-09 BR BRPI0008172-8A patent/BR0008172B1/pt not_active IP Right Cessation
  • 2000-02-09 WO PCT/CH2000/000070 patent/WO2000047509A1/de not_active Ceased
  • 2000-02-09 US US09/913,365 patent/US6619435B1/en not_active Expired - Lifetime
  • 2000-02-09 PL PL349849A patent/PL200624B1/pl unknown
  • 2000-02-09 JP JP2000598436A patent/JP4612953B2/ja not_active Expired - Fee Related
  • 2000-02-09 CA CA002362325A patent/CA2362325C/en not_active Expired - Fee Related
  • 2000-02-09 CZ CZ20012861A patent/CZ294428B6/cs not_active IP Right Cessation
  • 2000-02-09 ES ES00901469T patent/ES2298126T3/es not_active Expired - Lifetime
  • 2000-02-09 HU HU0105158A patent/HU228141B1/hu not_active IP Right Cessation
• 2001
  • 2001-07-12 ZA ZA200105741A patent/ZA200105741B/en unknown
  • 2001-08-08 NO NO20013871A patent/NO323917B1/no not_active IP Right Cessation

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