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
  • B66B5/044—Mechanical overspeed governors

Definitions

• the invention relates to the field of safety in the operation of elevators. More precisely, it relates to a device for triggering the mechanism for releasing the parachute of an elevator car in the event of a break in the cables suspending the car, or in the event of a travel speed greater than the nominal speed, following a problem. motorization.
• a pulley equipped with a pawl which, under the action of the centrifugal force created by the rotation of the pulley, deploys and can act on a pulley braking device when the pulley rotation speed is greater than a nominal rotation speed.
• tension pulley In the lower part of the elevator shaft, there is a pulley called "tension pulley”.
• a cable is mounted on the two pulleys. One end of the cable is fixed under the cabin, the other end is fixed above the cabin on the release device. The cable is kept under tension by the "tension pulley". The cable is driven by the down and up movement of the cabin, which causes the pulley equipped with the pawl to rotate.
• the triggering device described above only works in the case of a fall of the cabin due to the rupture of the suspension cables or in the event of overspeeding of descent. This device does not work when the climb speed of the lift cabin is greater than the nominal speed.
• the object of the invention is to propose a triggering device which is operating in the direction of descent of the cabin and in the direction of ascent.
• Another object of the invention is to provide a triggering device in which the pulley drive cable has a markedly reduced length, which allows installation costs to be reduced.
• the invention achieves its object by the fact that the cable comprises a single strand kept stretched between the upper part and the lower part of the sheath, which passes over two pulleys carried on a cross member articulated on the fixed structure of the cabin, one of the pulleys being movably mounted on said cross member and being loaded by elastic means which tend to separate it from the other pulley, the movement of this pulley mobile, following an overspeed of rotation, retracting a bolt intended to immobilize the crosspiece in normal operation, which causes the tilting of the crosshead and the triggering of the parachute release device.
• the device according to the invention is characterized in that it comprises a cross member hinged about a horizontal axis on a fixed structure of said cabin and held in a predetermined position by a bolt provided at a free end of said cross member, said bolt cooperating with said structure and being capable of being retracted by retracting means to allow tilting of said cross member in order to trigger said release mechanism, said retracting means comprising two pulleys mounted on said cross member, the pulley closest to the bolt being carried by a first carriage mounted to slide on the cross member and carrying the bolt, said carriage being loaded by first elastic means which tend to separate it from the other pulley, and a cable, one end of which is fixed in the upper part of the elevator shaft and the other end of which is fixed in the lower part of said shaft with inte insertion of second elastic means keeping said cable under tension, said cable passing over said pulleys to form an N and being intended to drive said pulleys in rotation during the movement of the cabin, the first and second elastic means being calculated in such a way that an
• the cable used is fixed in the sheath, and the pulleys, driven in rotation by the cable during the movement of the elevator car, are carried by the car. There are no longer any pulleys at the top and bottom of the elevator shaft.
• This arrangement is also an additional safety factor, since the pulleys are inaccessible in operation, which is not the case in current devices, where the upper pulley is generally placed in the machinery which is accessible by personnel.
• the pulley remote from the bolt is also carried by a second carriage capable of sliding on the cross-member, the first and the second carriages being connected respectively to the lower strand and to the strand upper of a belt winding on two idler pulleys mounted on the crosspiece.
• At least one of the pulleys is equipped with a braking device actuated by centrifugal force.
• FIG. 1 is a schematic front view of an elevator capable of being equipped with the device for triggering the parachute release device according to the invention
• Figure 2 is a side view of the same elevator which shows the arrangement of the wheel drive cable of the device according to the invention
• Figure 3 is a side view of the device according to the invention
• FIG. 4 is a section along the line IV-IV of FIG. 3.
• Figures 1 and 2 show a cabin 1 of an elevator, arranged in an elevator shaft 3.
• This cabin 1 can slide along guide rails 4a and 4b. It is suspended from a hanger cable 5 which is wound on a drive pulley 6 arranged in the machinery in the upper part of the sheath 3.
• a counterweight 6a is placed at the other end of the hanger cable 3.
• the invention can be applied to any elevator car whatever the motor means causing the movement of ascent or descent of the car 1.
• the engine can be of the hydraulic type, on board the car and actuating a muffle whose end of the cable is fixed in the upper part of the sheath 3.
• the reference 7 represents the parachute which in the event of overspeed of the cabin 1, in particular when going downhill, cooperates with the guide rails 4a and 4b, to brake the cabin 1 and block it. This parachute 7 is released by a release mechanism triggered by the device 10.
• the device 10 according to the invention comprises in particular two pulleys
• the cable 13 has an upper end 14 fixed in the upper part of the sheath 3 and a lower end 15 fixed in the lower part of the sheath with interposition of a spring 16 exerting a tension T on the cable 13.
• the cable 13 causes the pulleys 11 and 12 to rotate.
• the tension T prevents the cable 13 from sliding on the pulleys 11 and 12, in the event of acceleration of the cabin 3, which thus causes an acceleration of the rotation of the pulleys 11 and 12 and a slight variation in the tensions of the three portions of the cable 13: the upper portion, the middle portion connecting the two pulleys 11 and 12 and the lower portion subjected to the tension exerted by the spring 16.
• the respective axes 11a and 12a of the pulleys 11 and 12 are carried on carriages 16 and 17 slidably mounted on two parallel rails 18 and 19 connected at their ends by spacers 20 and 21 so as to constitute a crosspiece 22.
• the crosspiece 22 is mounted on the fixed structure 23 of the cabin 3 so as to be able to pivot around a pivot axis 25 parallel to the axes l ia and 11b of the pulleys 11 and 12.
• the carriages 16 and 17 are respectively loaded by springs 26a, 26b which bear on the crosspiece 22 and which tend to separate the two carriages 16 and 17, in order to keep the cable 13 under tension.
• a bar 27, terminated by a bolt 28 and extending parallel to the rails 18 and 19, is fixed to the carriage 17.
• the bolt 28 emerges on the end face of the spacer 21, an opening being formed in this spacer for the passage of the bar 27.
• the bolt 28 is intended to cooperate with a housing 29 formed in an element 30 of the structure stationary car 3, to immobilize the crosspiece 22 relative to the car 3 in case of normal operation of the elevator. It can be seen that, if the carriage 17 moves towards the pulley 11, the bolt 28 will retract and the cross-member 22 may tilt around its pivot axis 25 as a result of the tension T exerted by the spring 16 on the cable 13.
• the carriage 17 is fixed by an arm 31 to the upper strand 32a of an endless cable which is wound on return pulleys 33 and 34 mounted respectively at the ends of the crosspiece 22, on the rail 19 for example.
• the carriage 16 is fixed by another arm 31 to the lower strand 32b of the same endless cable.
• each carriage 16 or 17 can consist of two elements 17a and 17b provided with wheels 40 which roll on the sides of the rails 18 and 19.
• the two elements 17a and 17b can be joined together by an arch not shown in the drawing which passes over the pulley corresponding 11 or 12.
• One of these elements, 17b for example, may have a cylindrical surface 35 surrounding a brake 36 integral with the pulley 12.
• This brake 36 in the form of a disc, has radial holes 37 in which are slidably mounted weights 38 retained by springs 39.
• the reference 41 represents an actuator, integral with the crosspiece 22, which strikes the device for releasing the parachute during the tilting of the crosspiece 22, which causes the braking of the cabin 3. It is easily understood that the tilting of the crosspiece 22 may involve in its movement any other intermediate device, triggering the parachute release device.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Maintenance And Inspection Apparatuses For Elevators (AREA)
• Lift-Guide Devices, And Elevator Ropes And Cables (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=8849825

Family Applications (1)

Country Status (4)

Families Citing this family (4)

Family Cites Families (3)

• 2000
  • 2000-05-03 FR FR0005619A patent/FR2808517B1/fr not_active Expired - Fee Related
• 2001
  • 2001-05-03 EP EP01931779A patent/EP1282579A1/de not_active Withdrawn
  • 2001-05-03 AU AU2001258480A patent/AU2001258480A1/en not_active Abandoned
  • 2001-05-03 WO PCT/FR2001/001347 patent/WO2001083353A1/fr not_active Ceased

Non-Patent Citations (1)

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