EP0172975A1 - Spreizvorrichtung für zweiteilige Treibscheiben - Google Patents

Spreizvorrichtung für zweiteilige Treibscheiben Download PDF

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Publication number
EP0172975A1
EP0172975A1 EP84630126A EP84630126A EP0172975A1 EP 0172975 A1 EP0172975 A1 EP 0172975A1 EP 84630126 A EP84630126 A EP 84630126A EP 84630126 A EP84630126 A EP 84630126A EP 0172975 A1 EP0172975 A1 EP 0172975A1
Authority
EP
European Patent Office
Prior art keywords
pulley
spacer
cable
disc
lifting device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP84630126A
Other languages
English (en)
French (fr)
Other versions
EP0172975B1 (de
Inventor
Alain Zampetti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Secalt SA
Original Assignee
Secalt SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Secalt SA filed Critical Secalt SA
Priority to DE1984630126 priority Critical patent/DE172975T1/de
Priority to DE8484630126T priority patent/DE3472783D1/de
Priority to EP19840630126 priority patent/EP0172975B1/de
Priority to ES546361A priority patent/ES8608444A1/es
Publication of EP0172975A1 publication Critical patent/EP0172975A1/de
Application granted granted Critical
Publication of EP0172975B1 publication Critical patent/EP0172975B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • B66D1/74—Capstans
    • B66D1/7415—Friction drives, e.g. pulleys, having a cable winding angle of less than 360 degrees

Definitions

  • the invention relates to a free cable lifting device with a drive pulley composed of two half-pulleys, each of which has a groove for cable on its peripheral edge - and one of which is controlled, directly or indirectly. , by one motor and supports the other - in which the two half-pulleys, in order to increase the drive capacity of the lifting device, are pushed towards each other by a series of pressure devices rotating with them and distributed uniformly along their periphery.
  • annular half-pulley is particularly elastic and is moved away from the other half-pulley, at the places where the cable enters and leaves the groove, using at least one spacer, so that the cable is subjected to a strong localized pressure which would deform it causing unacceptable heating and wear .
  • the spacing device may consist of a roller rotating on an axis, parallel to the axis of the pulley, which is fixed to the casing outside the periphery of the half-pulleys.
  • both these kinds of spacers effectively prevent the cable from being subjected on the part of the half-pulleys to a particularly strong pressure localized at the entry and the exit of the groove for cable, and consequently very heavy wear.
  • both types of spacing device cause friction and a high temperature rise in the contact area between the caster or spacer ring and half-pulleys, this due to on the one hand, from the difference in the trajectories traveled by the points of the contact surfaces of the half-pulleys and of the caster (or ring) and therefore also of their different radial components and of the greater or lesser relative displacement in the radial direction of the surfaces in reciprocal contact, and, on the other hand, the significant force concentrated on them by half of the pressure devices distributed over the periphery of the half-pulleys.
  • the present invention completely eliminates this drawback by providing spacing devices capable of applying at least one of the half-pulleys, in the cable entry and exit zone, at least one force directed exclusively along the axis of rotation of the pulley. It is easy to see that this result can be achieved by several apparently very different forms of construction. All of these, however, include, on the one hand, at least a series of pressure elements, arranged uniformly along and near the periphery of the pulley and rotating with it, one or more of which exert on the an annular half-pulley, on the opposite side of the groove supporting the load, a thrust directed essentially along the axis of the pulley - therefore being free of any component due to sliding friction in the radial direction.
  • All these forms of construction comprise, on the other hand, a member which has at least one inclined surface relative to the half-pulley mounted on the shaft and which therefore lends itself to actuating the pressure elements cyclically in turn.
  • this member can be fixed relative to the chassis or rotate with the pulley.
  • the pressure elements can be represented by balls, by rollers, by sliding studs or the like.
  • the first pulley part 1 is keyed to the shaft 3, the bearings (not shown) are housed in the housing of the lifting device, while the annular pulley part 2 is - carried and rotated by the first part.
  • the cable is housed in a groove part 4 of the first pulley part 1 and is held there by the other groove part 5 located on the annular pulley part and consisting of a simple annular surface perpendicular to the axis 3 of pulley.
  • a compression spring 7 which is wound around a sleeve 8 and bears, at one end, against the part of annular pulley and, at the other end, on a flange of the sleeve, the latter being on the other hand retained by a screw 9 fixed in a threaded hole in the first part of pulley. In this way the annular pulley part is clamped against the first pulley part.
  • the two pulley parts 1, 2 both have an extension beyond the cable groove which is constituted by a circular crown 1 ′, 2 ′ and is, on its inner side, with a raceway 10, 11.
  • a spacer ring 12 which is delimited by two cylindrical surfaces concentric with the axis of the pulley and by two flat surfaces, one of which 13 lies in a plane perpendicular to the axis of the pulley and the second 14 in a slightly inclined plane relative to the first.
  • the thickness of the ring is therefore variable and precisely increases gradually from a minimum located in the center of the cable winding arc to a maximum in the diametrically opposite zone.
  • the spacer ring In order to allow the passage of the cable at the level of its entry and exit from the cable groove of the pulley, the spacer ring has two parallel holes tangent to its inner peripheral surface.
  • each flat surface 13, 14 of the spacing ring is arranged a raceway 16, 17 having the same diameter of the corresponding raceways respectively located, reciprocally opposite, on the circular rings 1 ', 2' .
  • the spacer ring is also connected to the housing of the lifting device by a bar, 18 which can slide in a hole, parallel to the axis of the pulley, bored in a lug 19 fixed to the ring. on the side opposite the cable winding arc.
  • the ring is thus prevented from rotating on its axis (coinciding with the axis of the pulley), but not from automatically carrying out, under the action of the clamping devices, a translation parallel to the axis of the pulley.
  • the ring thanks to the reciprocal inclination of its flat surfaces, has a thickness which, along the cable winding arc, is so reduced that the balls located opposite the part of annular pulley stay away from the raceway there and thus allow the cable to be tightened by the pressure devices, while, on the opposite side, the thickness of the ring is sufficient for the balls to abut against the annular half-pulley while rolling in the raceway and thus reciprocally - against the force of the pressure devices and thanks to the particular elasticity conferred on the annular part by its relatively reduced section - the sides of the groove for cable in a measure such that, their distance gradually decreasing in either peripheral direction, they do not come into contact with the cable until barely beyond its point of entry into the groove and lose the cont act with him only almost where he comes out.
  • the peripheral arrangement of the spacer ring allows it to intervene against the "creep of the cable” preventing the cable from climbing in the groove or even so radially due to its stress in traction, due to its loading unilateral, varies strongly along its course in the groove and necessarily results in a variation in the elongation of successive cable sections housed in the groove.
  • the spacer ring thus also functions as a "cable guide", which at least reduces wear.
  • FIGS. 4 and 5 A second form of construction (FIGS. 4 and 5) presents no difficulty as regards the use of two pulleys in tandem, since the ring 12 disposed radially outside the cable of the first form of construction is replaced by a disk with parallel surfaces 20 placed longitudinally outside the pulley, inside a toothed ring 21 secured to the peripheral part of the half-pulley 1.
  • the spacer disc 20 is supported by the shaft 3 by means of a ball joint 22 allowing it to vary its inclination relative to the half-pulley 1. This inclination can also be fixed to the using an adjusting screw 23 screwed to the casing on the opposite side of the winding bow.
  • the spacer disc 20 cooperates with several spacer rollers 24 which can rotate, in rectangular openings 25 distributed uniformly on a circumference near the cable groove of the half-pulley 1, on stirrups 26 which are fixed in notches arranged in the annular half-pulley and can slide in the openings 25 of the other half-pulley.
  • this embodiment of the invention fulfills its function while avoiding the limitations and drawbacks of the previous one.
  • the lateral arrangement of the spacer disc with respect to the cable eliminates, on the one hand, as regards the spacer disc, a risk of failure following the introduction of foreign bodies on the part of the cable, already thanks to the position of the spacer disc, inside the ring gear 21, and also because a sealing no longer appears, as for the first form of construction, random.
  • the lateral arrangement of the spacer disc eliminates the impossibility of coupling the drive pulley according to the invention with a toothed ring with a second drive pulley (equal or not) - although the pulley according to the invention can obviously also be used alone (as shown, for simplicity, in Figure 5).
  • the lifting device is no longer linked, for proper operation, to a determined thickness of cable: the half-pulley 2 can, in fact, approaching more or less the half -pulley 1 , leave more or less protruding the rollers of their opening, because by the adjusting screw we can now start and gradually end the tightening of the cable at the ends of the winding arc even if the thickness of the cable varies between certain limits.
  • spacer rollers represent a delicate element throughout the device because, in addition to being exposed to some fouling on the part of the cable, they are subjected, together with their stirrups, to a very high pressure. high, not very compatible with their very small dimensions.
  • the spacer device comprises, in fact, a disc 30 which can oscillate on a spherical bearing 31 carried by the shaft 3 and which is rotated by the half: pulley 1 using studs 32 sliding in holes bored in the axial direction in an extension 1 'of its peripheral edge.
  • These studs at one end, are articulated to the spacer disc by means of a ball joint 33 and, at the other end, are arranged with respect to spherical notches 34 in an extension 2 ′ of the half-pulley 2.
  • a thrust roller 35 is fixed by its stirrup to the casing - in such a way that its axis is parallel to the pulley and perpendicular to the axis of the latter - opposite the opposite place to the cable winding arc and in a position such that it rotates the spacer disc ment of a predetermined angle, it is understood that at least one stud, cyclically in turn, is brought to transmit to the respective spherical notch a force (of reaction) capable of drawing aside the half-pulley 2 to allow that the cable is tightened over almost the entire rolling arc.
  • the studs 32 and their articulation and sliding surface are almost out of reach for any foreign body, and then the spacing pressures applied by the free ends of the spacing studs are distributed over the surface. recesses 34 arranged on the surface of the half-pulley 2 and are therefore far lower than those concentrated along a generatrix of the small rollers 24.
  • the studs which, in this form of construction, can slide freely in their axial seats of the half-pulley l mounted on the shaft, are produced in two hollow coaxial parts whose free end is provided with a flange 41 and which contain in their internal cavity a compression spring 42.
  • the spacer disc 43 with its notches opposite the spacer studs is located in a cavity inside the toothed coupling ring with a second pulley according to the invention and is articulated to the casing of the lifting device using a ball cage rolling in raceways on a cylindrical part 46 projecting from the casing, in the direction of the axis of the pulley, and a needle stopper 47 mounted on a surface in an inclined circular crown integral with the casing.
  • this fourth form of construction of the pulley eliminates the disadvantages of the previous ones, but at the cost of a non-indifferent complexity which makes their manufacture quite expensive.
  • very tight tolerances and very high resistance characteristics, as well as a correspondingly long working time are required by all the adjustments and surface treatments relating to the sliding path in the half-pulley mounted on the axis and the notches in the spacer disc, which must be exactly on the axis of the sliding paths, and therefore depend on the adjustment and surface treatment of the bearing to a ball cage supporting the spacer disc, as well as for the adjustment and surface treatment of the inclined seat arranged in the casing for the cage with thrust needles, which must be such as to ensure the correct inclination of the annular half-pulley.
  • V - A fifth embodiment ( Figure 10) guarantees the desired result at a cost price which is a fraction of that which must be provided for all the adjustments and surface treatments mentioned.
  • a ball cage 45 and the needle stopper 47 as well as the spacer disc 43 itself by a simple needle stopper 50 commercially which is to be mounted in a bearing seat 51, suitably inclined, arranged in the casing of the device.
  • FIGS. 11 and 12 a sixth form of construction (FIGS. 11 and 12) can be chosen in order to discharge the casing from any function of resistance to a thrust in the axial direction falling under the use of pressure devices.
  • the pressure devices 6 thrust transmitted by the spacer disc is completely taken up and neutralized by a spacer flange 62 rigidly mounted on the shaft 3 of the pulley.
  • the invention in fact provides in this case that the spacer disc 60, also provided with notches opposite the spacer studs, is supported by means of a ball bearing 61, on a flange of spacing 62 which has two surfaces in a circular crown, one of which 63 is slightly inclined relative to the second 64.
  • This spacer flange 62 is, on the one hand, fixed relative to the casing by a rod 65 and, on the other hand, articulated to the shaft 3 of the pulley by means of a roller stopper 66 and a hub 67 on roller bearing 68, the forces transmitted by this stopper and this hub being, in turn, taken up by a support piece 69 consisting of a stopper flange with hub which is rigidly attached to the pulley shaft.
  • a seventh solution achieves all the kinematic and exercise results while avoiding all of the necessary adjustments and surface treatments in relation to the sixth solution: it is sufficient, also in this case, to replace the ball bearing 61, the roller bearing 68 and the roller bearing 66 as well as the spacer disc 60 and the spacer flange 62 with hub 67 themselves by a simple stopper with two crowns of needles and median plate with inclined "floating" faces 70 of the trade, the outer ring 71 of which can be clamped in a flange 72 with hub 73 rigidly mounted on the pulley shaft using a key and a push ring 74 while the middle plate 75 is fixed to the casing, for example, by a rod 76.
  • the middle plate can, by the use of this stop rod sliding in the radial direction either in its seat fitted in the middle plate or in its seat in the c arter, be kept “floating" and thus receive its self-centering from the two crowns of needles, themselves normally subject to self-centering.
  • the spacing device can comprise - instead of the bri of 72 provided with a hub mounted on the pulley shaft by means of a key in a well-defined position, essentially dependent, unequivocally, on a single thickness of cable - a set of stops 81 ( Figures 14 and 15 ) constituted by one threaded end 82 of the pulley shaft, by a stop flange 83 and by an adjusting nut 85.
  • the stop flange has a threaded hub 84 fixed on the shaft end 82 and its position in the axial direction can obviously be determined by more or less screwing the adjusting nut 85 on the threaded end 82 and tightening the stop flange against the adjusting nut strongly enough so that frictional forces between the surfaces reciprocally with respect to the hub 84 and the nut 85 as well as between the threads thereof and the thread of the shaft end 82 create and, even in the presence of repeated vibrations, effectively oppose loosening of the stop flange. It would moreover be easy for any 'skilled person' - in the event that it is feared that a loosening will occur for unforeseeable or inevitable causes - to provide the stop assembly with n ' no matter what known shutdown system.
  • stop rod 86 of the "floating" middle plate 87 of the spacer 80 must itself be able to move itself in the axial direction, in one direction and in the other, to the using, for example, a sliding slide (not shown).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pulleys (AREA)
  • Rolling Contact Bearings (AREA)
  • Friction Gearing (AREA)
  • Catching Or Destruction (AREA)
EP19840630126 1984-08-29 1984-08-29 Spreizvorrichtung für zweiteilige Treibscheiben Expired EP0172975B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE1984630126 DE172975T1 (de) 1984-08-29 1984-08-29 Spreizvorrichtung fuer zweiteilige treibscheiben.
DE8484630126T DE3472783D1 (en) 1984-08-29 1984-08-29 Spreader device for two-piece driving pulley
EP19840630126 EP0172975B1 (de) 1984-08-29 1984-08-29 Spreizvorrichtung für zweiteilige Treibscheiben
ES546361A ES8608444A1 (es) 1984-08-29 1985-08-23 Perfeccionamientos en los dispositivos de separacion de las poleas de arrastre de dos partes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19840630126 EP0172975B1 (de) 1984-08-29 1984-08-29 Spreizvorrichtung für zweiteilige Treibscheiben

Publications (2)

Publication Number Publication Date
EP0172975A1 true EP0172975A1 (de) 1986-03-05
EP0172975B1 EP0172975B1 (de) 1988-07-20

Family

ID=8192969

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840630126 Expired EP0172975B1 (de) 1984-08-29 1984-08-29 Spreizvorrichtung für zweiteilige Treibscheiben

Country Status (3)

Country Link
EP (1) EP0172975B1 (de)
DE (2) DE3472783D1 (de)
ES (1) ES8608444A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0745554A1 (de) * 1995-05-31 1996-12-04 Domenico Manca Tau- und/oder Seilzugvorrichtung
EP2275379A1 (de) 2009-07-17 2011-01-19 Hugo Leemans Sicherheitsaufzug

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112228527B (zh) * 2020-10-15 2022-05-17 重庆大学 一种可变齿厚的齿轮组件

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE429820C (de) * 1925-05-29 1926-06-03 Guilleaume Bollen Zweiteilige Seilscheibe
CH119296A (fr) * 1926-06-29 1927-08-01 Robert Fuchs & Fils Dispositif de commande d'un organe flexible.
BE833841A (nl) * 1975-09-26 1976-01-16 Hijsinrichting
DE2641446A1 (de) * 1975-09-26 1977-03-31 Western Gear Europ Hebezeug
DE2547194A1 (de) * 1975-10-22 1977-05-05 Erich Fritz Antriebsvorrichtung fuer einen foerderstrang
DE2522033C2 (de) * 1975-05-17 1983-01-05 Greifzug Gesellschaft für Hebezeugbau mbH, 5070 Bergisch-Gladbach Treibscheibentriebwerk

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE429820C (de) * 1925-05-29 1926-06-03 Guilleaume Bollen Zweiteilige Seilscheibe
CH119296A (fr) * 1926-06-29 1927-08-01 Robert Fuchs & Fils Dispositif de commande d'un organe flexible.
DE2522033C2 (de) * 1975-05-17 1983-01-05 Greifzug Gesellschaft für Hebezeugbau mbH, 5070 Bergisch-Gladbach Treibscheibentriebwerk
BE833841A (nl) * 1975-09-26 1976-01-16 Hijsinrichting
DE2641446A1 (de) * 1975-09-26 1977-03-31 Western Gear Europ Hebezeug
DE2547194A1 (de) * 1975-10-22 1977-05-05 Erich Fritz Antriebsvorrichtung fuer einen foerderstrang

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0745554A1 (de) * 1995-05-31 1996-12-04 Domenico Manca Tau- und/oder Seilzugvorrichtung
US6019354A (en) * 1995-05-31 2000-02-01 Vado; Giovanno Antonio Device for weighing lines and/or ropes, having a thrust ring for deflecting a driven wheel
EP2275379A1 (de) 2009-07-17 2011-01-19 Hugo Leemans Sicherheitsaufzug
WO2011006817A1 (en) 2009-07-17 2011-01-20 Hugo Leemans Security hoist

Also Published As

Publication number Publication date
ES8608444A1 (es) 1986-07-16
DE3472783D1 (en) 1988-08-25
ES546361A0 (es) 1986-07-16
DE172975T1 (de) 1986-09-04
EP0172975B1 (de) 1988-07-20

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