Classifications

• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
  • E04G3/00—Scaffolds essentially supported by building constructions, e.g. adjustable in height
  • E04G3/28—Mobile scaffolds; Scaffolds with mobile platforms
  • E04G3/30—Mobile scaffolds; Scaffolds with mobile platforms suspended by flexible supporting elements, e.g. cables
  • E04G3/32—Hoisting devices; Safety devices
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
  • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
  • B66D1/02—Driving gear
  • B66D1/14—Power transmissions between power sources and drums or barrels
  • B66D1/22—Planetary or differential gearings, i.e. with planet gears having movable axes of rotation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
  • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
  • B66D1/26—Rope, cable, or chain winding mechanisms; Capstans having several drums or barrels
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
  • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
  • B66D1/60—Rope, cable, or chain winding mechanisms; Capstans adapted for special purposes
  • B66D1/605—Rope, cable, or chain winding mechanisms; Capstans adapted for special purposes scaffolding winshes

Definitions

• the present invention relates to a device for balancing the traction forces, particularly intended for a winch intended to wind, respectively unwinding two or more traction cables, as well as a winch provided with such a device and a nacelle equipped with at least one winch as above.
• winches comprising in particular a double winding means, drums or pulleys of adhesion, each of said means carrying its own cable
• they are used for elevators or more particularly for nacelles responsible for cleaning and / or maintaining the facades of tall buildings.
• a nacelle is generally supported by four cables, a first pair of cables being disposed on a first narrow side of the nacelle while the second pair of cables is disposed on the second narrow side of the nacelle.
• Each pair of cables is wound / unwound from a winch fitted with two drums, each winch having its own motor controlled independently of the other.
• each winch The winding / unwinding speed adjustment of each winch is therefore done by known mechanical, electrical or electronic means so that each pair of cables is unwound or wound up at the same speed so that the nacelle remains horizontal.
• the means mentioned cannot be used to maintain their balance.
• An imbalance between the two cables of a pair can occur for example in the case of an irregular winding of one of the cables on its drum, leading to a winding subsequent turns on a diameter larger than that around which the other cable is wound. In this case, the cable winding over a larger diameter will tend to take up all of the tensile force, which can lead to an imbalance in the nacelle, or to endanger the personnel mounted in this nacelle by breaking of this overloaded cable.
• a first mechanical means making it possible to maintain an identical tensile stress on the two cables of the same pair, even in the event of one of the cables being wound incorrectly, consists in bringing the two cables together on a pulley. Such a device can be dangerous in the event of one of the cables breaking since the other cable then becomes free and the nacelle is no longer retained by either of the two cables.
• the two cables are fixed to the two ends of a lifting beam, the center of this being pivotally fixed to the suspension beam or to the nacelle.
• This device does not meet the drawback mentioned previously, but on the other hand the difference in admissible length between the two cables is limited by the length of the lifter.
• the attachment of the balancing device, hub of the pulley or center of the lifting beam is made at a single point, on the nacelle or on the suspension beam, which is ultimately harmful to the balance of the nacelle.
• a first object of the invention is therefore to propose a force balancing device for a winch provided for at least one pair of traction cables, making it possible to avoid the drawbacks mentioned above.
• Another object of the invention is to propose a winch provided for at least one pair of traction cables provided with at least one device balancing force capable of ensuring the security of the object suspended from cables at all times.
• Yet another object of the invention is to provide a facade maintenance nacelle provided with at least one winch equipped with a force balancing device.
• FIG. 1 is a view in elevation of a portion of an installation of facade cleaning
• Figure 2 is an end view of a portion of the installation of the previous figure
• Figure 3 is a longitudinal sectional view of a first embodiment of a balancing device according the invention
• FIG. 4 is a front view in partial section of the device of the preceding figure
• FIG. 5 is a view in longitudinal section of a second embodiment of a balancing device according to the invention
• FIG. 6 is a front view in partial section of the device of the previous figure
• FIG. 7 is a schematic representation of the operation of a portion of the device of FIGS. 5 and 6,
• FIGs 1 and 2 there is a building 1 having a vertical facade 10 and a roof 11, shown here as being a flat roof.
• the building 1 is equipped with an installation 2 for cleaning / maintaining the facade 10 comprising a nacelle 20 suspended by a first pair of cables 21 and a second pair of cables 22 with two support beams 23 and 24 mounted on a frame 25; preferably able to move on the roof 11, so that the nacelle 20 can reach the entire facade 10.
• the nacelle 20 shown here in particular comprises two end faces 20A and 20B each carrying a winch 3 making it possible to raise or lower the nacelle 20 respectively along the facade 10.
• the first winch 3 comprises in particular a first motor 30, of preferably an electric motor, a first reduction gear 31, as well as two drums 32 and 33, mounted coaxially on the wall 20A, while the second winch comprises a second motor 34, a second reduction gear 35 and two other drums 36 and 37, mounted coaxially on the wall 20B.
• the two drums 32 and 33 of the first winch each receive a cable 210, respectively 211 of the first pair of cables 21 while the two drums 36 and 37 each receive a cable 220, respectively 221 of the second pair of cables 22.
• the ends free cables 210 and 211 of the first pair 21 are fixed, preferably in a removable manner, to the beam 23 while the free ends of the cables 220 and 221 are similarly fixed to the beam 24.
• a control unit 38 supplies and controls each of the motors 30 and 34.
• the nacelle can also comprise two complementary units, shown diagrammatically at 39, capable of fulfilling one or more of the following functions: passage of the cables 210, 211 and 220, 221 distributed along an axis parallel to the axis of rotation of the drums, as shown in Figure 1 in the space between the drums and the units 39, in a configuration where each pair of cables is arranged in a plane perpendicular to the axis mentioned above, as seen in Figure 2, or then, for another embodiment of the nacelle not shown in the figures, in a plane parallel to said axis, in the portion located between the unit 39 and the beam 24, slicing of each cable on its drum and safety brake, blocking the cable or cables when a cable break is detected.
• These various means are known in the art and are therefore not described in more detail here.
• Uneven winding of one or more of the above cables on one or more of the drums mentioned may lead to an imbalance in the distribution of the load between the cables 210 and 21 1 or 220 and 221 or to an imbalance in the nacelle 20 corresponding to an angular offset around the longitudinal roll axis R or to an angular offset around the transverse pitch axis T, or even to a combination of these two offsets.
• this offset can be compensated for by acting on the relative speeds of the two motors 30 and 34, either by an automatic means for detecting said offset, either manually via the control unit 38. Since the two drums 32 and 33 of the first winch or 36 and 37 of the second winch are controlled by a single motor 30, respectively 34, it is not possible to compensate for an offset around the axis R by the means which come to be mentioned.
• the balancing device consists of a mechanical differential reducer with three axes, such as for example the planetary gear train 4, as shown on the Figures 3 and 4.
• the device 4 comprises an input shaft 40, actuated directly by the motor 30 or 34 or by the reducer 31 or 35, as required.
• a sun wheel 41 is fixedly mounted on the shaft 40.
• One or more planetary wheels 42 mesh on the one hand on the sun wheel 41 and on the other hand on an outer ring 43 with internal teeth.
• the crown 43 carries the drum 32 or 36 specific to a lifting system.
• Each of the planetary wheels 42 is pivotally mounted on an axis 420, said axes being fixed to a flange 44 in free pivoting around the end of the shaft 40.
• the flange 44 carries the drum 33 or 37.
• the device for balancing the traction forces 4 operates in the following manner, in the case where the two cables of a pair exert the same traction force on the two drums, respectively that identical torques are exerted, the two drums are rotated in opposite directions, with the rotation of the shaft 40, thus raising or lowering the nacelle according to the direction of rotation of the shaft 40.
• the drum on which is arranged the most tensioned cable is blocked, causing the movement made by the other drum to continue until the difference in forces is caught up and the forces exerted on the two cables are again substantially identical.
• the dimensional relationships between the different toothed wheels present may be different from what is described or shown, as well as the known construction variations of planetary type three-axis reducers, for example number of planetary gears different from this. which has been shown here or other mode of engagement of the gear wheels.
• FIG. 5 A second embodiment of a balancing device according to the invention is shown in Figures 5 and 6.
• This device which is also a mechanical differential reducer with three axes, essentially corresponds to a trochoidal (cycloidal) reducer known as the name of “Cyclo” (registered trademark), a particular embodiment of which is described in EP-0.291.052.
• This device 5 comprises an input shaft 50, coming like the shaft 40 of the preceding device directly from the drive motor or from an intermediate reducer.
• the shaft 50 includes a bearing eccentric cylindrical 51 fixed on the shaft.
• the eccentric bearing causes eccentric rotation a toothed wheel 52 carrying a cylindrical central bore 520, or suitable means of rotation, mounted on the eccentric bearing 51, an external toothing 521, a particular embodiment of which will be described more precisely below , as well as a plurality of circular bores 522 regularly spaced on a diameter coaxial with the central bore 520 and the toothing 521.
• the device 5 further comprises an outer ring 53 with inner toothing 530, including an embodiment particular will also be described below, partially meshing with the toothing 521 of the wheel 52.
• a flange 54 is pivotally mounted on the shaft 50, carrying a plurality of projecting rods 540, each corresponding to a bore 522 of the wheel 52. It can be seen in the figure that the bores 522 have a larger diameter than that of the rods 540; in fact this bore / rod device is responsible for transmitting the eccentric rotary movement of the wheel 52 in a rotary movement centered on the shaft 50 of the flange 54. For this, the diameter of a bore 522 is the diameter d 'a rod 540 plus the value of the eccentricity of the wheel 52.
• FIG. 7 shows a preferred embodiment of a portion of the device which has just been described, showing the engagement of the wheel 52 on the crown 53.
• the crown 53 carries a plurality of semi-cylindrical housings 531, bearing each a rou water 532 in free rotation in said housing 531. In the example shown, the crown 53 comprises twenty housings 531 and as many rollers 532.
• the eccentric wheel 52 carries on its periphery a plurality of semi-cylindrical housings 523, the number of said cylindrical housings being here less than one unit compared to the number of rollers 532. It is therefore understood that, if the crown 53 is blocked, has a turn of the eccentric wheel 52 for nineteen turns of the shaft 50, respectively a turn of the flange 54 or of the drum 33 or 37 which it carries, for a turn of the shaft 50. By cons by blocking the flange 54 or the drum 33 or 37, respectively the wheel 52, there are twenty turns of the crown 53, respectively of the drum 32 or 36 which it carries for one turn of the shaft 50.
• An advantage of a trochoidal differential balancing device according to this second described embodiment, relative to the planetary one according to the first described embodiment, is that the ratio of the speeds of the drums relative to the speed of the shaft d drive is significantly larger, making it possible, with a trochoidal balancing device according to this second embodiment, to refrain from placing a speed reducer 31 or 35 between the motor and the shaft d input 50 of the balancing device.
• a trochoidal differential balancing device can be envisaged; for example, there may be a difference between the number of rollers 532 and the number of housings 523 on the wheel 52 greater than one unit, for example two or three units.
• the external toothing 521 of the wheel 52 and the internal toothing 530 of the crown 53 can be different from what has been described here, it is possible to have conventional toothing 521 and 530, one or more teeth being simultaneously engaged.
• the trochoidal differential balancing device can also be constructed like that described in document EP-0,291,052, comprising several wheels 52 in parallel, eccentrically offset, so as to distribute the forces more smoothly and evenly.
• Other types of reducers can also be provided to function as a balancing device.
• a Harmonie Drive registered trademark reducer or more generally a differential mechanical reducer as found on a car could very well fulfill the desired function of balancing the traction forces.
• any differential mechanical reducer mounted between the two drums could be used as a balancing means.
• a three-axis reducer will be used for reasons of compactness of the device.
• a balancing device can be supplemented with a decoupling means, for example a ratchet means, making it possible, for example, to easily unwind the cables of their drums when the basket is on the ground, in order to hang them on the suspension beams.
• a balancing device can also be used on a winch provided with two pulleys of adhesion rather than two drums; preferably the adhesion pulleys will then be provided with known means making it possible to adhere the cable to a portion of the periphery of the pulley.
• the nacelle described above and represented in the figures is designed with the four cables each fixed to a corner of the nacelle, other configurations for fixing the cables can also be envisaged, for example the four cables aligned in a plane containing the longitudinal axis of the nacelle.
• a single winch actuated by a single motor, the motor axis supporting two sets of drums, each drum set comprising a balancing device according to one or other of the embodiments described.
• a single winch respectively a single drive shaft, may comprise several pairs of drums and / or grip wheels, each pair having its own balancing device.
• the balancing device according to one or other of the embodiments described, as well as the winch carrying such a balancing device have been described and shown to be used with a maintenance nacelle of a building facade; however, both the balancing device and the winch can be used in many other applications.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Wind Motors (AREA)
• Retarders (AREA)
• Jib Cranes (AREA)
• Carriers, Traveling Bodies, And Overhead Traveling Cranes (AREA)
• Movable Scaffolding (AREA)
• Catching Or Destruction (AREA)
• Testing Of Balance (AREA)
• Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
• Transmission Devices (AREA)
• Types And Forms Of Lifts (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=4226790

Family Applications (1)

Country Status (10)

Families Citing this family (19)

Family Cites Families (19)

• 2000
  • 2000-10-27 AT AT00969150T patent/ATE260220T1/de not_active IP Right Cessation
  • 2000-10-27 EP EP00969150A patent/EP1232113B1/de not_active Expired - Lifetime
  • 2000-10-27 AU AU78972/00A patent/AU7897200A/en not_active Abandoned
  • 2000-10-27 US US10/130,774 patent/US6688582B1/en not_active Expired - Fee Related
  • 2000-10-27 JP JP2001539781A patent/JP5014545B2/ja not_active Expired - Fee Related
  • 2000-10-27 CN CN00816054.6A patent/CN1244487C/zh not_active Expired - Fee Related
  • 2000-10-27 ES ES00969150T patent/ES2213613T3/es not_active Expired - Lifetime
  • 2000-10-27 WO PCT/CH2000/000576 patent/WO2001038217A1/fr active IP Right Grant
  • 2000-10-27 DE DE60008576T patent/DE60008576T2/de not_active Expired - Lifetime
• 2003
  • 2003-04-09 HK HK03102555A patent/HK1050352A1/xx not_active IP Right Cessation

Non-Patent Citations (1)

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