Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
  • B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
  • B66B11/0065—Roping
  • B66B11/008—Roping with hoisting rope or cable operated by frictional engagement with a winding drum or sheave
  • B66B11/009—Roping with hoisting rope or cable operated by frictional engagement with a winding drum or sheave with separate traction and suspension ropes

Definitions

• the present invention relates to a device for adhering the drive in elevator installations provided with drive means and suspension means independent of each other.
• an elevator installation of this type which comprises an elevator car and a counterweight mounted movably in a sheath along respective guide rails, a motor which drives in rotation a traction sheave, at least one suspension cable to which the cabin and the counterweight are suspended, and a linear element for the movement drive of the cabin-counterweight system, such as chain, belt or cable, said linear element wrapping around the traction sheave, with a rubbing contact.
• the motor must communicate to the linear drive element only a very strong tensile force reduced, only sufficient to cause the excess load of the cabin compared to the counterweight;
• the engine can be less bulky and therefore be entirely housed in the residual space between the cabin and the adjoining wall of the duct;
• the traction sheave can be made less resistant than that used so far and likewise, the cables can be thinner.
• the initial tension of the cable or cables of the linear drive element of the cabin, applied during assembly is defined once and for all. It depends on the anchoring attachment points of the ends of this or these cables and on a certain extension of the cable or cables created by the fixing means used (threaded rod, spring).
• This kinematic arrangement does not take into account the elastic elongation of the cable (s) caused during loading of the cabin, compaction of the building, variation in temperature, etc.)
• the tension initially desired and defined varies, it modifies the tension ratio of the strands of cables on both sides of the pulley, until a critical differential which leads to the sliding of the cables on the traction sheave by loss of grip of the rotary drive of the cable (s) on the drive pulley. Said arrangement therefore does not function reliably over time.
• the invention aims to remedy this drawback by proposing a device for adhering the drive in elevator installations provided with drive means and independent suspension means, characterized in that one end of the linear drive element of the cabin is connected to a fixed point and its other end, on the other side of the traction sheave, is fixed to an articulated mechanical assembly forming a lever and provided with a constant load, applying on it a constant tension T c while a tension T is applied on the other side of the pulley, so that the tension differential T - T c of the linear element on the one hand and other side of the pulley is less than a critical value ⁇ T Q determined by the configuration of the drive from which the linear element slides on the traction sheave.
• the advantage of the device according to the invention is to subject the linear drive element to the mass load of the lever of the assembly articulated, which is defined as a function of said minimum adhesion value and which guarantees the adhesion of the cable in all situations of cabin load and fluctuations and aging of the elevator installation and building concerned.
• the device is designed to satisfy the maximum values of the elongation of the cable up to a maximum limit value. It includes a sensor for measuring the elongation of the linear drive element, the operation of the elevator being authorized in a determined elongation zone of the linear element, this to ensure the safe operation of the elevator.
• the adhesion of the linear element to the traction sheave which may consist of one or more cables or even of one or more flat or non-flat belts, varies according to the shape of the pulley grooves for receiving the cables or belts, the diameter of the pulley and the nature of the materials used for the cables or belts and the pulley and these parameters influence said load tension value of the linear drive element.
• Said cables or belts of the linear drive element are advantageously connected by their aforementioned end to said mechanical assembly by means of an articulated assembly itself on the mechanical assembly so that they do not flex at their said end during of the movement of the mechanical assembly around its articulation to compensate for the fluctuations of the elevator installation.
• This assembly may consist of a plate or plate articulated on the mechanical assembly, which in the case of several cables or belts for the linear element, further comprises a spring connected to the end of each of the cables or belts in view of '' balance the tensions of cables or belts at the same level on the plate of the mechanical assembly.
• the result of this arrangement according to the invention is a device for adhering the linear element for driving the elevator car to the driving pulley, which is perfectly independent of the fluctuations in anchoring of the ends of the linear element, unlike the aforementioned conventional technique, and which provides a permanent characteristic of adhesion of the linear drive element to its drive pulley, whatever the fluctuations of the elevator, of the elongation of the linear element, and building movement in which the installation is mounted.
• FIG. 1 is a schematic view of an installation of a driven elevator and independent suspension provided with the device according to the invention
• Figure 2 is a perspective view and cross section of the traction sheave receiving the linear drive element;
• Figure 3 is an enlarged view of the articulated mechanical assembly;
• FIG. 4 is an enlarged view of the articulated plate of the mechanical assembly, to which is connected the linear drive element.
• the elevator installation shown in FIG. 1 comprises a car 1 and a counterweight 3 which can move in a vertical sheath, respectively along car rails and counterweight rails, not shown.
• the cabin 1 and the counterweight 3 are each suspended from a cable 5 ', only one of which is shown so as not to clutter the figures.
• the counterweight 3 is generally chosen to balance the weight of the cabin 1 increased by the weight of half the maximum load that can be loaded in the cabin.
• the elevator installation also includes a drive motor 7 which, in the illustrated embodiment, has been shown at the top of the shaft.
• a traction sheave 9 On the motor shaft is wedged a traction sheave 9 which is rotated when the motor is running. On the traction sheave 9 is wound with a contact rubbing a linear drive element 5, such as two juxtaposed cables 5a, each received in a V-groove of the pulley ( Figure 2).
• the suspension of the counterweight 3 has been shown on the left side of FIG. 1 and the drive of the cabin 1 on the right side.
• the cabin carries in a median vertical plane two upper pulleys 11 and four lower pulleys 13.
• the upper pulleys 11 are each arranged close to each side of the cabin and receive the suspension cable 5 ′ of the counterweight, which is fixed to the upper end of the sheath at 14, passes under the pulleys 11, is wound on a high deflection pulley 15 and is muffled on a counterweight pulley 17 to start again up to a high fixing point 19 of the sheath.
• the lower pulleys 13 are arranged adjacent two by two, vertically and at a short distance from each other, on each side of the cabin. They receive the linear drive element 5 (with two steel cables 5a), which is fixed at the top of the sheath at 21, descends vertically from the left to start horizontally returning to the two upper lower pulleys 13, ascends vertically on the high traction sheave 9, rolls up on a semicircle and descends vertically to a low return pulley 23 at the bottom of the sheath, then goes back up to the horizontal return by the low lower pulleys 13 and goes back down to 'to an articulated mechanical assembly 25 to which it is connected by its end.
• the linear drive element 5 with two steel cables 5a
• the example shown shows a muffle drive case enabling the cabin tensile force to be halved.
• the drive movement of the cabin is directly controlled, both upwards by the return of the linear drive element on the upper lower pulleys, and downhill by that of the lower lower pulleys.
• the tension of the linear drive element on the right side of the pulley T c is imparted by the articulated mechanical assembly 25 described below and on the left side T by the variable load of the cabin.
• T - T 0 must be less, preferably significantly less than a critical value ⁇ T 0 (TT c ⁇ T G ) from of which, for a given grip configuration of the cables 5a on the pulley 9, a function of the materials of the cables and of the pulley, of the winding of the cables on the pulley, of the slope of the grooves, etc., the cable risks slide on the pulley to a maximum value T ma ⁇ of T at the maximum cabin load.
• the voltage T c is therefore determined by the above inequation, ⁇ T 0 and ⁇ m ___ being known
• the mechanical assembly 25 is constituted by a lever 27, which is articulated at 29 by its end to a support base 31 fixed at sheath bottom and is provided at its other end with a mass 33 of weight determined.
• the two cables 5a of the linear drive element are connected to an articulated plate 35, disposed close to the axis of articulation 29 of the lever, so as to tension them in the lever arm ratio of the lever 27 and in proportion of the weight of the end mass 33.
• Each of the cables 5a is mounted passing through in the plate 35 and comprises a helical spring 37 at its end, applied under the underside of the plate 35.
• the cables are applied on either side of the axis of the plate, equal distance from each other, one of the cables being shown in vertical dashed line in Figure 3.
• the springs 37 are identical and their tension adjustment is made so that the plate 35 is horizontal and remains so during the lever travel due to fluctuations over time in the geometric dimensions of the elevator installation, the support building and cable extension.
• An end-of-travel switch 39 is disposed under the lever 27 integral with the base 31. This switch 39 is intended to interrupt the operation of the elevator at an excessive movement of the lever 27, descending downward and signifying too great a fluctuation. detrimental to the operation of the installation.
• the voltage T c on the cables 5a is distributed equivalent for each of them and it remains constant over time, unless the operation is cut off by the safety limit switch 39.
• This tension T 0 is regulated by an adequate mass 33, possibly displaceable over the length of the lever, at a tension level for which, at a maximum load of the cabin determining Tmax, Tmax - T c ⁇ T 0 according to the above-mentioned inequality so that the cables do not slip on the traction sheave.
• the mass of the lever can be supplemented by a jack connected to the lever and applied to the latter at a constant pressure.
• the device may include a mass suspended at the end of the linear element.

Landscapes

• Engineering & Computer Science (AREA)
• Civil Engineering (AREA)
• Mechanical Engineering (AREA)
• Structural Engineering (AREA)
• Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
• Cage And Drive Apparatuses For Elevators (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=29226271

Family Applications (1)

Country Status (7)

Cited By (1)

Families Citing this family (5)

Family Cites Families (3)

• 2002
  • 2002-12-03 FR FR0215195A patent/FR2847891A1/fr not_active Withdrawn
• 2003
  • 2003-01-24 WO PCT/FR2003/000236 patent/WO2003086937A1/fr not_active Ceased
  • 2003-01-24 RU RU2005120743/11A patent/RU2005120743A/ru not_active Application Discontinuation
  • 2003-01-24 DE DE60310448T patent/DE60310448D1/de not_active Expired - Fee Related
  • 2003-01-24 AT AT03717350T patent/ATE348071T1/de not_active IP Right Cessation
  • 2003-01-24 AU AU2003222337A patent/AU2003222337A1/en not_active Abandoned
  • 2003-01-24 EP EP03717350A patent/EP1567443B1/de not_active Expired - Lifetime

Non-Patent Citations (1)

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