EP1007467B1 - Echafaudage a erection automatique - Google Patents

Echafaudage a erection automatique Download PDF

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Publication number
EP1007467B1
EP1007467B1 EP97917960A EP97917960A EP1007467B1 EP 1007467 B1 EP1007467 B1 EP 1007467B1 EP 97917960 A EP97917960 A EP 97917960A EP 97917960 A EP97917960 A EP 97917960A EP 1007467 B1 EP1007467 B1 EP 1007467B1
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EP
European Patent Office
Prior art keywords
sleeve member
tower
pivoting
rams
rung
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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.)
Expired - Lifetime
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EP97917960A
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German (de)
English (en)
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EP1007467A1 (fr
Inventor
André ST-GERMAIN
Luc Tessier
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Les Produits Fraco Ltee
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Les Produits Fraco Ltee
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Publication of EP1007467A1 publication Critical patent/EP1007467A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
    • B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations

Definitions

  • the present invention relates to self raising platform assemblies, and more particularly to the means for raising such platforms.
  • U.S. patent n°4,809,814 issued in 1989 to JEAN ST-GERMAIN shows a scaffolding with a platform raising system (figure 7) comprising an arm 84 and a ram member 106 that work together to raise (or lower) the platform 42.
  • the platform 42 is vertically movable along an upstanding post 30 and is symmetrically positioned thereon.
  • ram member 106 upwardly extends its piston rod 112 which slidably and pivotably engages, with its upper end, successive transverse bars or steps 38 of post 30.
  • a guide bar 120 is provided to slidably engage each successive step 38 and prevent piston rod 112 from abutting against the lower portion of said steps.
  • piston rod 112 When its stroke is complete, piston rod 112 is retracted by its cylinder 108 and downwardly abuts with a hook member 118 against a step 38; therefore, when its stroke is reversed, ram member 106 raises platform 42. Arm 84 engages with a hook member 90 steps 38 on the opposite side of post 30, while ram member 106 is in its upward stroke, to uphold platform 42. Arm 84 is pivotable and is also equipped with a guide bar 98 to clear each successive step 38 as platform 42 is raised by ram member 106. Piston rod 112 has an upward stroke allowing it to move two steps at a time, to accelerate the raising of the platform. To lower the platform, however, an operator must manually pivot arm 84 (and a second security arm 84') to allow them to clear each successive step 38.
  • FIG. 9 shows that the platform raising system comprises two power actuated hydraulic rams 36 each having a hook member 50 pivotably installed at the upper end of their piston rod. Biasing means 54, 56, 60, 62 link the hook members 50 of the two rams 36 in an opposite simultaneous pivoting movement, so that hooks 50 may pivotably engage or clear the bars or rungs of the tower frame structure (as in the JEAN ST-GERMAIN patent).
  • Levers 72 can pivot to clear each successive step 10 while they are raised with the work platform during the upward stroke of rams 36. During the lowering of the platform, an operator must manually pivot latching levers 72 to their rung unlatching position in which the platform may be lowered without hindrance to the platform lowering operation.
  • Both of the previously mentioned patents thus include a work platform which can be raised (or lowered) along a single tower through the instrumentality of powered rams that pull the work platform by hooking themselves on successive rungs of the tower.
  • These patents are functional, though the raising or lowering of the platform is a relatively slow operation. Also, an operator is needed to manually pivot the arm 84 (in the JEAN ST-GERMAIN patent) or the latching levers 72 and hook releasing handle 66 (in the ANDRE ST-GERMAIN patent) to allow the lowering of the work platform.
  • Another object of the invention is that the system of the character described be fail-safe.
  • the present invention relates to a platform raising system in a scaffolding for raising a work platform along a tower, said platform being sustained by a sleeve member positioned around said tower, almost encircling it completely, said sleeve member being movable along said tower, said tower having a plurality of approximately parallel and equally spaced rungs, said raising system being installed on said sleeve member, said raising system comprising two rams pivotably attached to said sleeve member and having piston rods movable from a retracted position to an extracted position and at the end of which are pivotably installed corresponding hook members, said rams being connected to power means and control means that simultaneously activate each ram in up and down movement but in alternate directions, first pivoting means for pivoting said hook members from a hooking position to an unhooking position under the action of said rams, said raising system further comprising synchronizing means for synchronizing the relative movement of said rams, at least one of said hook members abutting against one of said rung
  • said sleeve member is raised or lowered of a distance approximately equal to the distance between two successive rungs under the action of each ram, the strokes of said rams being at least equal to slightly more than the distance between two successive rungs.
  • said first pivoting means are inclined surfaces on said hook members, said inclined surfaces being slidably engageable with each successive rung to pivot said hook members in said unhooking position.
  • said hook members have biasing means for pivoting them from said unhooking position to said hooking position when said inclined surface is not in contact with one of said rungs.
  • said platform raising system comprises second pivoting means for pivoting said hook members from said hooking position to said unhooking position, said second pivoting means comprising a latch lever member pivotable between a latched position and an unlatched position, said second pivoting means being gradually activated during the extension stroke of said rams from an inactive position when said piston rods are in said retracted position, said second pivoting means pivoting one of said hook members only if: a) said hook member is not bearing on any one of said rungs in a hooking engagement; and b) said latch lever member is in said unlatched position.
  • a latch handle is provided to manually force said latch lever member into said latched position or into said unlatched position.
  • said second pivoting means further comprise at least one spring for each of said rams, said spring being attached to a corresponding one of said latch lever members at its first extremity and to said sleeve member at its second extremity, said spring being at its equilibrium state when said corresponding piston rod is in said retracted position.
  • said hook members have biasing means for pivoting them from said unhooking position to said hooking position when said second pivoting means are not pivoting them into said unhooking position.
  • said synchronizing means are a pair of parallel toothed racks engaging peripherally a complementary gear wheel on opposite sides of the latter, each one of said racks being rigidly linked to a corresponding one of said hook members and said gear wheel being rotatably carried by said sleeve member.
  • said platform raising system further comprises a security braking system, said braking system to be activated only if said sleeve member moves generally downwardly along said tower at a specific speed or faster, said specific speed being considerably faster than the speed at which the sleeve member moves along said tower during its use.
  • said braking system comprises a rocking member pivotable between a rung engaging and a rung clearing position, a retainer arm pivotable between a first and a second limit position, said retainer arm retaining said rocking member in said rung clearing position when it is in said first limit position, biasing means for pivoting said rocking member in said rung engaging position when said retainer arm is in said second limit position and a finger member for pivotable abutment against each of said successive rungs, said finger member pivoting on itself when the speed of said sleeve member is lower than said specific speed and pivoting said retainer arm from said first limit position to said second limit position when the speed of said sleeve member is greater than said specific speed.
  • FIG. 1 shows a scaffolding 38 comprising a tower 40 which rests on - and is attached to - a base 42 securingly anchored to the ground G, e.g. with bolts 44.
  • Tower 40 is of the type described in the above-mentioned JEAN ST-GERMAIN Patent, except for a few improvements which will be described later, and comprises inter alia a plurality of generally horizontal and vertically equally spaced rungs 45.
  • Tower 40 is secured to the wall (not shown) of the structure on which work is done and is spaced therefrom through the instrumentality of a plurality of cross bars (not shown, but refer to the JEAN ST-GERMAIN patent).
  • a sleeve member 46 is movable along tower 40, sleeve member 46 having a rectangular cross-section (figure 23) and being positioned around tower 40, almost encircling it completely.
  • Sleeve member 46 has a vertical opening 47 allowing it to move along tower 40 without hindrance from the cross bars.
  • a work platform (figure 1) 48 is removably attached to sleeve member 46 in a manner which will also be described later.
  • FIG. 2 shows a platform raising (and lowering) system 50 according to the invention.
  • Raising system 50 comprises two powered rams 52, 52 that are hingedly attached, at the lower end of their cylinder, to sleeve member 46 through the instrumentality of ears 54 and bolts 56.
  • Each ram 52 has a hook member 58 (figures 2 and 6 to 9) pivotably attached at the free end of its piston rod 52a by a hook bolt 59.
  • Hook member 58 has an inclined upper surface 60.
  • hydraulic power means 62 shown in figure 1 (which can be, for example, an internal combustion engine coupled to an oil pump), simultaneously activate each ram 52 in up and down movement but in alternate directions.
  • the piston rod 52a of the first ram is extracted from the cylinder and the corresponding hook member 58 is moved upwardly from its initial resting position on a rung 45.
  • Hook member 58 originally in its generally vertical hooking position, slidably engages with its inclined surface 60 each successive sliding member 64 fixed to rungs 45 (figure 7), being forced into its unhooking position.
  • hook member 58 After sliding along sliding member 64, hook member 58 is biased to its hooking position through the instrumentality of a pair of hook springs 66, once it vertically clears the corresponding rung 45 (figure 8). Its extension stroke finished, the first ram 52 proceeds to its retraction stroke, which will engage its hook member 58 on the rung 45 (figure 9). Since work platform 48 is hingedly fixed to rams 52, the retraction stroke of one or the other rams 52, 52 results in the raising of platform 48.
  • Figure 2 shows a control handle 68, linked to hydraulic power means 62, which can be positioned in three different modes of operation: a) platform raising mode; b) platform lowering mode; and c) inactive mode.
  • the modes are explicit, and control handle 68 therefore allows an operator to control the platform raising system 50 in any of those three modes.
  • FIG. 2 suggests with arrows 70a, 70b that hydraulic power means 62 are linked to rams 52.
  • Hydraulic flow input arrow 70a shows where the fluid is inserted in the ram 52 that is on the verge of starting its extraction stroke, while hydraulic flow output arrow 70b shows the fluid output of the ram 52 that is about to begin its retraction stroke.
  • Figures 3 to 5 show three different consecutive positions of the sleeve member 46, work platform 48 and platform raising system 50 along a same section of tower 40. It can be seen that the rams 52, as previously stated, have an extension stroke equal to slightly more than the distance between two rungs 45. The upward movement of work platform 48 during this operation is substantially continuous since each step is done almost immediately after the previous step is finished. Also, since the platform may be raised in a continuous manner, the platform raising system 50 is relatively faster than the conventional "stop and go" systems.
  • FIGs 10 to 13 show that, to lower work platform 48, there is provided a latch handle 72 pivoted around a pivot screw 74 at the first end of a slider arm 76, which is secured to the block fastened to piston rod 52a and carrying pivot bolt 59 of hook member 58 (see Figure 8 and 12).
  • Slider arm 76 is slidably guided at its second end in a rail 78 (figure 2) which is fixedly anchored to sleeve member 46. Slider arm 76 can therefore freely slide vertically along rail 78 to follow corresponding hook member 58 during each stroke of ram 52.
  • a U-shaped link 80 pivots a latch lever member 82 generally downwardly around a pivot pin 84 from its latched position to its unlatched position.
  • figure 14 shows that the first and second legs 80a and 80b of U-shaped link 80 are rotatably attached to latch handle 72 and to latch lever member 82, respectively.
  • First leg 80a is attached non-coaxialy relative to pivot screw 74 on latch handle 72 so as to provoke the generally downward movement of its second leg 80b around pivot pin 84, therefore forcing latch lever member 82 into its unlatched position
  • latch lever member 82 will depend on the state of a pair of springs 86, 86.
  • Figures 2 and 6 show that springs 86 are attached at their upper end to a spring plate 88 (fig. 6) and at their lower end to a respective piston 90 which is slidably and vertically movable inside a bored piston guide 92 fixedly but adjustably attached to a vertical beam 94 of sleeve member 46 structure ( Figure 2).
  • link 80 will keep latch lever member 82 in its latched position (figures 10 and 12).
  • Figures 10 to 13 show a wire 96 adjustably attached, e.g. by means of a set screw 98, at its first extremity to hook member 58 and passing through bores in slider arm 76 and in latch lever member 82.
  • a retainer cap 100 is fixed at the second extremity of wire 96, under latch lever member 82. Since hook springs 66 tend to keep hook member 58 in its hooking position, wire 96 will pull on retainer cap 100 and contribute to keep latch lever member 82 in its latched position.
  • hook member 58 pivots into its unhooking position (figure 7)
  • link 80 keeps latch lever member 82 in its latched position
  • wire 96 will be free to move downwardly under the (less than considerable) weight of retainer cap 100.
  • latch lever member 82 will be free to move from its latched position to its unlatched position.
  • piston rod 52a of corresponding ram 52 is retracted (as the right hand ram 52 of figure 2), there is no tension in spring 86 and hook member 58 will be kept in its hooking position by hook springs 66, therefore forcing with wire 96 latch lever member 82 into its latched position.
  • hook member 58 moves upwardly and piston 90 will slide correspondingly upwards in piston guide 92, until its lower end equipped with a radial flange 90a abuts against piston guide 92, near the one third of the course of piston rod 52a.
  • spring 86 will be gradually stretched and it will apply a downward force on latch lever member 82, thus applying a pressure to pivot hook member 58 into its unhooking position through the instrumentality of wire 96.
  • latch handle 72 when latch handle 72 is kept in its upwardly- oriented position, springs 86 have no effect whatsoever. But when latch handle 72 is pivoted downwardly, hook member 58 will be pivoted into its unhooking position unless it already engages a rung 45 which would prevent this. Indeed, figure 9 shows that the retaining surface 101 (by abutting on rung 45) of hook member 58 prevents the latter from pivoting to its unhooking position.
  • the operator desires work platform 48 to move downwardly, he pivots both latch handles 72, 72 downwardly and he positions control handle 68 to its platform lowering mode.
  • FIG 2 shows that vertical beams 94 hold a gear housing 102.
  • Figure 15 shows that gear housing 102 houses two slidable toothed racks 104, 104, which are fixedly attached (e.g. welded) by means of a rack plate 106 to a corresponding hook bolt 59, and a complementary gear wheel 108.
  • Rack plates 106 have a generally triangular shape and have flanges 106a extending along racks 104 to allow bolting of one to the other.
  • Housing 102 has openings on its sides to allow rack plates 106 to extend outwardly therefrom (figure 16).
  • the racks 104 and gear wheel 108 assembly synchronizes the relative movement of hook members 58, 58 to prevent them from being unattuned with one another, which would of course mean that the platform raising system 50 would be inoperable. Both hook members 58 therefore always stay in registration with one another.
  • FIGs 17 to 20 show a security braking system 110 installed between the two vertical beams 94 of sleeve member 46 (figure 2).
  • Braking system 110 comprises a rocking member 112 which can pivot around a holding pin 114 between a rung clearing position (figure 17) and a rung engaging position (figure 19).
  • Rocking member 112 has a sectorial edge 115 and a blocking arm 116 having a T-shaped cross-section at its free extremity 116a (figure 20) and extending opposite sectorial edge 115 on rocking member 112, T-shaped extremity 116a being a counterweight for the rest of rocking member 112.
  • a concentric arcuate slot 118 is provided near sectorial edge 115 through which a blocking pin 120 is slidable.
  • the rung engaging and rung clearing positions are defined by the corresponding limit positions of rocking member 112 sliding around blocking pin 120 between the two positions in which the extremities of arcuate slot 118 abuts against blocking pin 120.
  • Braking system 110 further comprises a retainer arm 122 positioned over rocking arm 112 and pivotable around an arm pin 124.
  • Retainer arm 122 has a wheel 126 near arm pin 124 which engages a complementary widthwise groove 128 in rocking member 112 when it is in the rung clearing position.
  • a finger 130 is pivotably installed on retainer arm 122 generally opposite wheel 126 relative to arm pin 124, a finger spring 132 also linking it to retainer arm 122.
  • a tension spring 134 is hooked to a hook 135 protruding from sectorial edge 115 of rocking member 112 at its first extremity and to a spring pin 136 fixed to vertical beams 94, 94 at its second extremity. Tension spring 134 is stretched when rocking member 112 is in its rung clearing position, and lengthwisely paritally bears on sectorial edge 115 of rocking member 112.
  • finger spring 132 In use, finger spring 132 is in its equilibrium state when finger 130 is between two rungs 45 (figure 17 in full lines), the free extremity of finger 130 then extending beyond the vertical plane of rungs 45 shown in figures 17 to 19 by axis 138: finger 130 is then in its rung engaging position.
  • finger 130 When sleeve member 46 is lowered at a normal (relatively slow) rate, finger 130 will hit smoothly each successive rung 45 and pivot upwardly until rung 45 is cleared (figure 17 in dotted lines). Finger spring 132 will pivot finger 130 back into its rung engaging position afterwards.
  • finger spring 132 When sleeve member 46 is raised, finger 130 will hit smoothly each successive rung 45 and pivot downwardly until rung 45 is cleared (figure 17 in dotted lines). Again, finger spring 132 will pivot finger 130 back in its rung engaging position afterwards.
  • blocking arm 116 When the next rung 45 is encountered, blocking arm 116, now in the rung engaging position and therefore extending beyond plane 138, will abut against this rung 45 (figure 19) and stop the fall of sleeve member 46.
  • Figure 21 shows the hydraulic circuit 140 of platform raising system 50.
  • a motor 142 internal combustion or otherwise linked to a pump 144 which feeds circuit 140 with the proper fluid (e.g. oil) from a supply reservoir 146.
  • the fluid will be fed simultaneously to each ram 52, but the hydraulic flow input will be fed alternately to the upper and lower circuit connections 52b and 52c, respectively, of rams 52, which will result, as is known in the art, in the alternate movement of the piston rods 52a of rams 52.
  • a flow controler 148 will determine, through the instrumentality of control handle 68 (figure 22), the direction of the flow, which in turn will determine wether the sleeve member is raised or lowered.
  • FIG. 23 A basic form of sleeve member 46 is shown in figure 23.
  • This sleeve member has a central sleeve 150 and one generally cubic side structure 152 on each side of central sleeve 150.
  • Each side structure 152 has a plurality of joists and cross bars, as is detailed in the previously cited patents.
  • Under each side structure 152 are fixedly attached rectangular tubes 153 for slidably inserting complementary rectangular support rods (not shown).
  • a platform can be removably installed for supporting workmen.
  • a second and a third platform (not shown) can also be installed on sleeve member 46, on the top bars 154 of side structures 152, for supporting equipment used by the workmen at a height that would be easily reachable without having to bend down.
  • strucural module members 156 (figures 24 to 26) that are similar to the cubic side structures 152, 152.
  • Figures 23 to 26 show that these module members can be removably installed on the outer end of side structures 152, 152 by means of hooking members 158 slidably engageable into complementary hook casings 160.
  • Any number of these module members 156 can be added to the basic sleeve member 46 (up to the structural capacity limit of the material being used, of course) since every module member 156 is equipped with hooking members 158 on one side and with hook casings 160 on the other.
  • sleeve member 46 and all module members 156 attached thereto must be of approximately equally distributed weight and approximately symmetrically installed relative to tower 40, so as to be generally balanced and not induce important stresses in tower 40 due to lateral tilting of the latter.
  • Figure 27 shows the tower 40 and sleeve member 46 engagement. It can be seen in figures 27 to 29 that idle rollers 162 are installed on the inner side of sleeve member 46 to rotatably abut against the outer side of tower 40 on its corner tower posts 163 to prevent sleeve member 46 from moving in any direction except along tower 40.
  • FIGS 29 to 31 show that tower 40 is modular. Indeed, attachment means 164 are provided to fixedly attach two tower modules 166 to one another. With this modular tower 40, the height of the tower can be easily adjusted by the workmen. Attachment means 164 can be, for example, of the type shown in figures 30 and 31, comprising a slider plate 168 slidably engaging a pair of parallel receiving plates 170, 170 and fixed thereto by means of a bolt 172.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Movable Scaffolding (AREA)
  • Jib Cranes (AREA)
  • Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Ladders (AREA)
  • Glass Compositions (AREA)
  • Paints Or Removers (AREA)
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  • Conveying And Assembling Of Building Elements In Situ (AREA)

Claims (15)

  1. Système d'élévation de plate-forme dans un échafaudage, ledit système incluant une plate-forme de travail (48) pouvant être élevée le long d'une tour (40), ladite plate-forme étant soutenue par un élément à manchon (46) positionné autour de ladite tour, en l'entourant presque complètement, ledit élément à manchon étant mobile le long de ladite tour, ladite tour ayant une pluralité de traverses approximativement parallèles et également espacées (45), ledit système d'élévation (50) comprenant ledit élément à manchon et deux vérins (52) fixés, de façon pivotante, audit élément à manchon (46) et ayant des tiges de piston déplaçables d'une position rétractée vers une position étendue et à l'extrémité desquelles sont installés, de façon pivotante, des éléments de crochet correspondants (58), lesdits vérins (52) étant reliés à des moyens de puissance (142, 144) et à des moyens de commande (148), des premiers moyens de pivotement (60) pour faire pivoter lesdits éléments de crochet (58) d'une position d'accrochage vers une position de décrochage sous une course d'extension desdits vérins (52), ledit système d'élévation (50) étant caractérisé en ce que lesdits moyens de puissance et lesdits moyens de commande activent simultanément chaque vérin dans un mouvement de va-et-vient mais dans des sens alternés et en ce qu'il comprend de plus des moyens de synchronisation (104, 108) pour synchroniser le mouvement relatif desdits vérins, au moins l'un desdits éléments de crochet (58) en engagement d'accrochage avec l'une desdites traverses (45) dans ladite position d'accrochage à un moment donné pour soutenir ledit élément à manchon (46), des seconds moyens de pivotement (96, 82, 86) pour faire pivoter lesdits éléments de crochet (58) de ladite position d'accrochage vers ladite position de décrochage, lesdits seconds moyens de pivotement comprenant un élément de levier à verrou (82) pouvant pivoter entre une position verrouillée et une position déverrouillée, lesdits seconds moyens de pivotement étant activés graduellement pendant la course d'extension desdits vérins à partir d'une position inactive quand lesdites tiges de piston sont dans ladite position rétractée, lesdits seconds moyens de pivotement faisant pivoter l'un desdits éléments de crochet vers ladite position de décrochage seulement si : a) ledit élément de crochet n'est pas en engagement d'accrochage avec l'une quelconque desdites traverses ; et b) ledit élément de levier à verrou est dans ladite position déverrouillée.
  2. Système d'élévation de plate-forme comme défini dans la revendication 1, dans lequel lesdits premiers moyens de pivotement sont des surfaces inclinées (60) sur lesdits éléments de crochet (58), lesdites surfaces inclinées étant engageables de façon coulissante avec chaque traverse successive (45) pour faire pivoter lesdits éléments de crochet vers ladite position de décrochage, et incluant de plus des moyens de sollicitation (66) sollicitant lesdits éléments de crochet pour pivoter de ladite position de décrochage vers ladite position d'accrochage.
  3. Système d'élévation de plate-forme comme défini dans la revendication 1, incluant de plus une poignée de verrou (72) reliée audit élément de levier à verrou (82) pour forcer manuellement ce dernier dans ladite position verrouillée ou dans ladite position déverrouillée.
  4. Système d'élévation de plate-forme comme défini dans la revendication 1, dans lequel lesdits seconds moyens de pivotement comprennent de plus au moins un ressort de traction (86) pour chacun desdits vérins (52), ledit ressort (86) étant fixé à un correspondant desdits éléments de levier à verrou (82) au niveau de sa première extrémité, et audit élément à manchon (46) au niveau de sa seconde extrémité, ledit ressort (86) étant dans son état détendu quand ladite tige de piston correspondante est dans ladite position rétractée.
  5. Système d'élévation de plate-forme comme défini dans la revendication 2, incluant de plus une poignée de verrou (72) reliée audit élément de levier à verrou (82) pour forcer manuellement ce dernier dans ladite position verrouillée ou dans ladite position déverrouillée.
  6. Système d'élévation de plate-forme comme défini dans la revendication 5, dans lequel lesdits seconds moyens de pivotement comprennent de plus au moins un ressort de traction (86) pour chacun desdits vérins (52), ledit ressort (86) étant fixé à l'un correspondant desdits éléments de levier à verrou (82) au niveau de sa première extrémité, et audit élément à manchon (46) au niveau de sa seconde extrémité, ledit ressort (86) étant dans son état détendu quand ladite tige de piston correspondante est dans ladite position rétractée.
  7. Système d'élévation de plate-forme comme défini dans la revendication 1, dans lequel lesdits moyens de synchronisation sont une paire de crémaillères dentées parallèles (104) engageant périphériquement une roue dentée complémentaire (108) sur des côtés opposés de cette dernière, chacune desdites crémaillères étant liée rigidement à l'un correspondant desdits éléments de crochet, ladite roue dentée étant supportée de façon rotative par ledit élément à manchon (46).
  8. Système d'élévation de plate-forme comme défini dans la revendication 7, incluant de plus une poignée de verrou (72) reliée audit élément de levier à verrou (82) pour forcer manuellement ce dernier dans ladite position verrouillée ou dans ladite position déverrouillée.
  9. Système d'élévation de plate-forme comme défini dans la revendication 8, dans lequel lesdits seconds moyens de pivotement comprennent de plus au moins un ressort de traction (86) pour chacun desdits vérins (52), ledit ressort (86) étant fixé à l'un correspondant desdits éléments de levier à verrou (82) au niveau de sa première extrémité, et audit élément à manchon (46) au niveau de sa seconde extrémité, ledit ressort (86) étant dans son état détendu quand ladite tige de piston correspondante est dans ladite position rétractée.
  10. Système d'élévation de plate-forme comme défini dans la revendication 1, comprenant de plus un système de freinage de sécurité (110), ledit système de freinage étant activé seulement si ledit élément à manchon (46) se déplace généralement vers le bas le long de ladite tour à une vitesse spécifique ou supérieure, ladite vitesse spécifique étant considérablement plus grande que la vitesse à laquelle l'élément à manchon se déplace le long de ladite tour pendant son utilisation.
  11. Système d'élévation de plate-forme comme défini dans la revendication 10, dans lequel ledit système de freinage (110) comprend un élément basculant (112) pouvant pivoter entre une position engageant une traverse et une position libérant une traverse, un bras de retenue (122) pouvant pivoter entre une première et une seconde positions limites, ledit bras de retenue (122) retenant ledit élément basculant (112) dans ladite position libérant la traverse quand il est dans ladite première position limite, des moyens de sollicitation (134) pour faire pivoter ledit élément basculant (112) dans ladite position engageant la traverse quand ledit bras de retenue est dans ladite seconde position limite, et un élément à doigt (130) pour la butée pivotante contre chacune desdites traverses successives, ledit élément à doigt (130) pivotant sur lui-même quand la vitesse dudit élément à manchon est inférieure à ladite vitesse spécifique, et faisant pivoter ledit bras de retenue (122) de ladite première position limite vers ladite seconde position limite quand la vitesse dudit élément à manchon (46) est supérieure à ladite vitesse spécifique.
  12. Système d'élévation de plate-forme comme défini dans la revendication 9, comprenant de plus un système de freinage de sécurité (110), ledit système de freinage étant seulement activé si ledit élément à manchon (46) se déplace généralement vers le bas le long de ladite tour à une vitesse spécifique ou supérieure, ladite vitesse spécifique étant considérablement plus rapide que la vitesse à laquelle l'élément à manchon se déplace le long de ladite tour pendant son utilisation.
  13. Système d'élévation de plate-forme comme défini dans la revendication 12, dans lequel ledit système de freinage (110) comprend un élément basculant (112) pouvant pivoter entre une position engageant une traverse et une position libérant la traverse, un bras de retenue (122) pouvant pivoter entre une première et une seconde positions limites, ledit bras de retenue (122) retenant ledit élément basculant (112) dans ladite position libérant la traverse quand il est dans ladite première position limite, des moyens de sollicitation (134) pour faire pivoter ledit élément basculant (112) dans ladite position engageant une traverse quand ledit bras de retenue est dans ladite seconde position limite, et un élément à doigt (130) pour la butée pivotante contre chacune desdites traverses successives, ledit élément à doigt (130) pivotant sur lui-même quand la vitesse dudit élément à manchon est inférieure à ladite vitesse spécifique, et faisant pivoter ledit bras de retenue (122) de ladite première position limite vers ladite seconde position limite quand la vitesse dudit élément à manchon (46) est supérieure à ladite vitesse spécifique.
  14. Echafaudage comprenant :
    a) une tour verticale (40) ayant une pluralité de traverses (45) sensiblement horizontales et verticalement également espacées ;
    b) une plate-forme de travail (48) déplaçable verticalement le long de ladite tour ;
    c) un élément à manchon (46) entourant partiellement et verticalement mobile le long de ladite tour (40), ladite plate-forme de travail étant fixée audit élément à manchon ;
    d) un premier vérin et un second vérin (52) fixés de façon pivotante audit élément à manchon, chaque vérin comprenant une tige de piston extensible (52a) ayant une extrémité libre externe et un élément de crochet pouvant pivoter (58) fixé à ladite extrémité libre externe, au moins l'un desdits éléments de crochet reposant sur l'une desdites traverses à un moment donné pour soutenir ladite plate-forme de travail ;
    e) des premiers moyens de pivotement (60) pour faire pivoter lesdits éléments de crochet d'une position d'accrochage vers une position de décrochage sous l'action desdits vérins ;
    f) des moyens de puissance (144) pour activer lesdits vérins, ledit échafaudage étant caractérisé en ce que lesdits moyens de puissance activent alternativement lesdits vérins et en ce qu'il comprend de plus :
    g) des moyens de synchronisation (104, 108) pour synchroniser le mouvement des tiges de piston dans l'action simultanée et opposée de celles-ci,
    dans lequel ladite plate-forme de travail peut être élevée ou abaissée le long de ladite tour dans un mouvement continu par l'action desdits vérins qui sont activés alternativement, pour un engagement alterné desdits éléments de crochet sur lesdites traverses.
  15. Echafaudage comme défini dans la revendication 14, dans lequel lesdits moyens de synchronisation sont une paire de crémaillères dentées parallèles (104) engageant périphériquement une roue dentée complémentaire (108) sur des côtés opposés de cette dernière, chacune desdites crémaillères étant rigidement liée à l'un correspondant desdits éléments de crochet, ladite roue dentée étant supportée de façon rotative par ledit élément à manchon (46).
EP97917960A 1997-05-05 1997-05-05 Echafaudage a erection automatique Expired - Lifetime EP1007467B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/CA1997/000307 WO1998050301A1 (fr) 1997-05-05 1997-05-05 Echafaudage a erection automatique
CN97182154A CN1091747C (zh) 1997-05-05 1997-05-05 脚手架上的平台举升系统及其构成的脚手架

Publications (2)

Publication Number Publication Date
EP1007467A1 EP1007467A1 (fr) 2000-06-14
EP1007467B1 true EP1007467B1 (fr) 2002-07-03

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EP97917960A Expired - Lifetime EP1007467B1 (fr) 1997-05-05 1997-05-05 Echafaudage a erection automatique

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EP (1) EP1007467B1 (fr)
CN (1) CN1091747C (fr)
AT (1) ATE220047T1 (fr)
AU (1) AU2628997A (fr)
BR (1) BR9714660A (fr)
CA (1) CA2288162C (fr)
DE (1) DE69713813D1 (fr)
ES (1) ES2177971T3 (fr)
PT (1) PT1007467E (fr)
WO (1) WO1998050301A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012006694A1 (fr) * 2010-07-16 2012-01-19 Marc Keersmaekers Système élévateur à utiliser dans un échafaudage
PL2593391T3 (pl) * 2010-07-16 2017-10-31 Marc Keersmaekers Moduł podnośnikowy do podnoszenia i opuszczania rusztowania
BE1019424A5 (nl) * 2010-07-16 2012-07-03 Keersmaekers Marc Liftsysteem voor een steiger.
BE1019305A5 (nl) * 2010-07-16 2012-05-08 Keersmaekers Marc Een lifteenheid voor een steiger, werkwijzen om met de lifteenheid te stijgen en af te dalen in een steiger, werkwijzen om een steiger op te bouwen, en werkwijzen om een steigen af the breken.
AT510921B1 (de) * 2010-12-29 2013-10-15 Mertl Daniel Vorrichtung zur Beförderung von Lasten oder Personen
CN102602857B (zh) * 2012-03-22 2015-04-22 江苏启良停车设备有限公司 攀爬机
CN108423554A (zh) * 2018-03-31 2018-08-21 江西中天机械有限公司 一种具有安全防护功能的塔式起重机操作平台

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3804369A (en) * 1972-04-14 1974-04-16 J Sutton Jacking mechanisms
US4007914A (en) * 1975-06-17 1977-02-15 Sutton John R Jacking mechanism
US4809814A (en) * 1988-04-01 1989-03-07 St Germain Jean Scaffolding
US5259479A (en) * 1991-10-15 1993-11-09 Gestion Des Brevets Fraco Ltee Self-raising cantilever-type work platform assembly
US5368125A (en) * 1993-04-16 1994-11-29 St-Germain; Andre Platform raising system in scaffolding
US5579865A (en) * 1994-02-23 1996-12-03 Butler; J. Frank Scaffold

Also Published As

Publication number Publication date
WO1998050301A1 (fr) 1998-11-12
CN1091747C (zh) 2002-10-02
ATE220047T1 (de) 2002-07-15
CN1254322A (zh) 2000-05-24
PT1007467E (pt) 2002-11-29
AU2628997A (en) 1998-11-27
DE69713813D1 (de) 2002-08-08
ES2177971T3 (es) 2002-12-16
CA2288162C (fr) 2002-07-23
BR9714660A (pt) 2000-07-11
HK1027795A1 (en) 2001-01-23
CA2288162A1 (fr) 1998-11-12
EP1007467A1 (fr) 2000-06-14

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