EP2806097B1 - Trittstufe mit einziehbaren Rädern, und mit einem handbedienten Schwenkvorderrad - Google Patents

Trittstufe mit einziehbaren Rädern, und mit einem handbedienten Schwenkvorderrad Download PDF

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Publication number
EP2806097B1
EP2806097B1 EP14168496.9A EP14168496A EP2806097B1 EP 2806097 B1 EP2806097 B1 EP 2806097B1 EP 14168496 A EP14168496 A EP 14168496A EP 2806097 B1 EP2806097 B1 EP 2806097B1
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EP
European Patent Office
Prior art keywords
plane
uprights
lever
wheel
upright
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Application number
EP14168496.9A
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English (en)
French (fr)
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EP2806097A1 (de
Inventor
Patrick Lachant
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CDH Group SAS
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CDH Group SAS
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    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C1/00—Ladders in general
    • E06C1/02—Ladders in general with rigid longitudinal member or members
    • E06C1/38—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
    • E06C1/397—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders characterised by having wheels, rollers, or runners
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C1/00—Ladders in general
    • E06C1/02—Ladders in general with rigid longitudinal member or members
    • E06C1/38—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
    • E06C1/39—Ladders having platforms; Ladders changeable into platforms
    • E06C1/393—Ladders having platforms foldable with the ladder

Definitions

  • the invention relates to running boards, including the individual rolling platform type (PIR) as defined by French standards NF P 93-352 and NF P 93-353.
  • PIR rolling platform type
  • a step conventionally comprises a front plane having two front uprights and at least one step connecting the front uprights, and a rear plane having two rear uprights and at least one bar connecting the rear uprights, hinged mounted relative to the front plane.
  • the footboards of the PIR type further include a floor mounted between the front plane and the rear plane to allow an operator to work at height without fatigue, his two feet resting flat on the floor, and wheels facilitating the movement of the footboard .
  • the steps of this type are folding, the rear plane tilting on the front plane to allow easy storage and relatively compact footboard.
  • the step is equipped with wheels. More specifically, on a large number of models, the rear plane is provided with wheels fixed to the rear uprights, and which, when the step is unfolded and rests on the ground in the abnormal working position, are raised above the ground. When the user wishes to move the step, he grasps it by the front upright, tilts it back until the wheels touch the ground, allowing it to be maneuvered and rolled.
  • the US patent US 6,026,931 proposes a structure according to the preamble of claim 1 wherein the rear portion of the step is provided with rear wheels mounted on spring, while the front portion of the step is provided with a pair of front wheels mounted on an axis. pivoting, the tilting of the front wheels to a position of displacement being controlled by the foot by actuating a pedal, associated with the descent of the user of the step: The reverse tilting of the front wheels to a retracted position is caused by the imposition a weight (in practice, the weight of the user) on the running board.
  • a weight in practice, the weight of the user
  • the sole weight of the leg on the first step is not sufficient to cause the tilting of the front wheels to their retracted position. The user is therefore exposed to the risk of falling if he does not impose, at the first step, a sufficient weight to the running board.
  • a first objective is to propose a rolling step that can be moved without difficulty by the user.
  • a second objective is to propose a rolling step which presents a better ergonomics for the user.
  • a third objective is to provide a rolling step providing enhanced safety for the user.
  • the manual operation of the lever causes the deployment of the front wheel, which allows to temporarily place the step in a rolling configuration for easy movement.
  • the front wheel regains its retracted position by gravity, the step then resting on the ground at least by its front uprights, which allows the user to climb on it without risk of evasion.
  • step 1 On the figure 1 is represented a step 1 intended to allow work at height.
  • the step 1 is of the individual rolling platform type.
  • the step 1 comprises a front plane 2 having a pair of uprights 3 front and at least one step 4 transversely connecting the uprights 3 before.
  • the step 1 comprises a single step 4 .
  • several steps could be provided.
  • the amounts 3 are in this case formed of metal profiles (for example aluminum or aluminum alloy), in particular rectangular section. At lower ends 5, the uprights 3 are provided with pads 6 slip.
  • the step 4 is formed of a folded cut sheet.
  • the step 4 has a nose 7 of step formed by a fold which extends projecting from the front plane 2 , extended downwards by a lower edge 8 by which the step 4 is fixed on the uprights 3, in particular by riveting.
  • the step 1 further comprises a rear plane 9 hinged to the front plane 2 and having a pair of rear uprights 10 and at least one bar 11 connecting the rear uprights 10 .
  • the rear uprights 10 are, like before uprights 3, formed of metal profiles (e.g. aluminum or aluminum alloy), in particular with a rectangular section. At lower ends 12, the rear uprights 10 are provided with pads 6 slip.
  • the step 1 is unfolded (configuration illustrated in the figures)
  • the plane 9 back forms an angle with the plane 2 before, and 12 lower ends of the posts back 10 form, with the 5 lower ends of the uprights 3 before a plan P laying (dashed) for the step 1, corresponding to a floor S ideally plan on which rest the step 1.
  • the rear plane 9 comprises three bars 11. These bars 11 are in this case square section, but this section could be circular or oval. Depending on the height of the step 1, the number of bars 11 could be different (especially higher). Fixing the bars 11 rear uprights 10 is here made by bouterollage.
  • the rear plane is mounted articulated with respect to the plane of the two front ends 13 of the upper rear uprights 10, which are shorter than the uprights 3 before.
  • the pivot axis of the rear plane is formed by screws 14 secured to fixed plates 15 (in this case by bolting) on external lateral faces of the uprights 3 before, as shown in the figures.
  • the step 1 further comprises a floor 16 which extends astride between the front plane 2 and the rear plane 9 in unfolded configuration of the step 1.
  • This floor 16 is hingedly mounted relative to the front plane 2 via of a cylindrical lintel 17 fitted on a bar 18 connecting the uprights 3 before.
  • the floor 16 is also articulated relative to the rear plane 9 by means of connecting rods 19, the floor 16 resting in the deployed configuration, a rod 11 connecting the struts 10 back.
  • the floor 16 may be provided with a baseboard 20 covering three sides of the floor 16, with the exception of a front edge to facilitate the access of the user to the floor 16 by plane 2 before.
  • This baseboard 20 forms a stop for the feet of the user and thus prevents it from tripping, limiting the risk of falling.
  • the step 1 is also equipped with a shelf 21 tool holder (or package carrier), which extends transversely between the uprights 3 before, at an upper end of these.
  • the shelf 21 is fixed to the front uprights 3 by means of fittings 22 overlapping a top bar 11 connecting the rear uprights 10 .
  • the step 1 is also equipped with a railing 23, mounted on the front plane 2 in line with the floor 16 in unfolded configuration of the step 1, and intended to retain the user in case of imbalance, so as to minimize the risk of falling.
  • This railing 23 is collapsible. It comprises a pair of side rails, namely a barrier 24 left and 25 right barrier, each pivotally mounted on a front upright 3 between an extended position (shown in the figures) in which each fence 24, 25 extends substantially perpendicularly in front plane 2 , and a folded position in which each barrier 24, 25 extends against the front plane 2 .
  • Each barrier 24, 25 has a U-shaped profile and is preferably formed of a metal tube (for example aluminum or aluminum alloy) folded.
  • Each barrier 24, 25 has an upper section or ramp 26, intended to extend at the height of the trunk of the user (between the belt and the bust), an intermediate section or main 27 current (visible, for the barrier 25 right , by dashed transparency on the figures 1 and 4 ), vertical in the deployed position of the barrier 24, 25 and in unfolded configuration of the step 1, and a lower section 28 .
  • Each barrier 24, 25 is hinged relative to the upright 3 before by its ramp 26 and its lower section 28 , both mounted on coaxial pivots 29 (formed in this case by screws) secured to clevises 30 in which are housed in the deployed position, the respective ends of the ramp 26 and the lower section 28 , as illustrated in FIG.
  • the railing 23 further comprises a movable gate 32 for retaining the unbalanced user forward of the step, while delimiting the work area so that a single user can move with ease on the floor 16 .
  • the gate 32 will be described in more detail below.
  • the step 1 is provided with retractable wheels.
  • the step 1 is equipped with a pair of retractable rear wheels 33 movably mounted relative to the rear plane 9 between a retracted position in which the rear wheels 33 extend above the laying plane P , and a position deployed in which the rear wheels 33 extend at least partially below the laying plane P.
  • Each rear wheel 33 is permanently biased towards its deployed position by a spring 34 (in this case a compression spring).
  • each rear wheel 33 is mounted on a rear upright 9 by means of a U-shaped mounting plate 35 , comprising a core 36 through which the plate 35 is fixed (in species by screwing) to the amount 10, and two arms 37 projecting transverse.
  • the wheel 33 is mounted at the lower end of a support shaft 38 , slidably fitted to the ends of the arms 37 with the interposition of the spring 34, as illustrated in the inset on the figure 1 , and on the figure 7 .
  • a cover can be fitted on the plate 35 to cover the spring and thus prevent dust and debris from the construction site come to hinder the proper functioning of the spring 34.
  • On the figure 1 only one cache is visible (on the right), the left cache having been omitted (as on the figure 7 ) to reveal the spring 34 and the plate 35.
  • the rear wheels 33 are retracted and the step 1 rests on the ground S, at the rear plane 9 , by its pads 6.
  • the rear wheels 33 are deployed and the step 1 rests, at the rear plane 9 , on the ground S by its rear wheels 33 , the laying plane P being raised relative to the ground S .
  • rear wheels 33 are shown in a position in which they extend substantially parallel to the rear plane 9, they are however mounted freely pivotable both around their central axis of rolling and around their shaft 38 support.
  • the step 1 further comprises a train 39 rolling forward, equipped with a wheel 40 before retractable (as shown on the figure 1 ), or two or more wheels, as shown in the variant of the figure 3 .
  • the forward rolling gear 39 is movably mounted relative to the front plane 2 between a retracted position in which the front wheel 40 extends above the laying plane P (FIG. figure 4 ), and an extended position in which the front wheel 40 protrudes from the laying plane P ( figure 6 ).
  • the undercarriage 39 comprises a cross member 41 preferably having a profile substantially U pivotally mounted between the uprights 3 back in the vicinity of their lower ends 5.
  • the cross-member 41 comprises a central section 42 , which extends transversely, and at the opposite ends of the central section 42 , two angled returns 43 through which the cross-member 41 is rotatably mounted on the uprights 3 before, for example by bolting (but this pivoting attachment could be made by screwing or riveting).
  • the step 1 comprises a single front wheel 40 (in the example of the figure 1 )
  • this wheel 40 is preferably mounted in the center of the central section 42 .
  • the wheel 40 could be slightly offset laterally, provided that it does not result in an unbalance of the step 1.
  • the step 1 comprises a pair of wheels 40 before (in the example of the figure 3 ) these wheels 40 are preferably mounted on the central section 42 in the vicinity of the returns 43, so as to maximize the stability of the step 1, but the wheels 43 could be deported to the center of the central section 42 .
  • the or each front wheel 40 is mounted on the cross member 41 by means of a shaft 44 bolted to a bracket 45 secured to the cross member 41.
  • the or each wheel 40 before is freely pivoting around of its driving axis that around its shaft 44 support.
  • the step 1 further comprises a mechanism 46 for actuating the wheel 40 before to control deployment (in advance of the displacement of the step 1) or conversely allow it to retract.
  • This actuating mechanism 46 comprises at least one lever 47 maneuvering articulated on a post 3 before, and a rod 48 coupling the lever 47 to the train 39 rolling forward.
  • the lever 47 is in the form of a U-shaped section (metal or plastic) mounted on the upright 3.
  • the lever 47 is secured, for example, by means of a bolt 49 which forms the pivoting axis of the lever 47.
  • the lever 47 has a front wall 50 , on which is pressed the user to tilt the lever 47 about its axis, and two side walls, namely an outer wall 51 and a wall 52 internal side, which frame the amount 3 and by which the lever 47 is fixed on the amount 3 .
  • one of the side walls (in this case the inner wall 52 ) has an end portion 53 which protrudes from the upright 3 opposite the front wall 50 towards the inside of the step 1.
  • this portion 53 end is made a piercing 54 in which is introduced a folded upper end 55 of the bead wire 48 (which is in this case in the form of a metal rod with small diameter circular section) to achieve the pivot connection between the rod 48 and the lever 47 for maneuvering.
  • one of the returns 43 at right angles to the cross member 41 is pierced with a hole 56 into which is introduced a folded lower end 57 of the bead wire 48 to provide the pivot connection between the bead wire 48 and the cross member 41.
  • the rod 48 runs along the upright 3 before, the bore 54 in the lever 47 and the hole 56 in the crossbar 41 being situated in the vicinity of a rear face of the upright 3.
  • the step 1 is equipped with a guide 58 fixed on the upright 3 substantially midway between the lever 47 and the train 39 rolling forward, and wherein the rod 48 is slidably mounted. This guidance allows to use for the realization of the rod 48 a small diameter rod, which will have the advantage of lightness and visual discretion.
  • the rod 48 along the amount 3 before, it does not present any gene or any risk for the user.
  • the aesthetics of step 1 are also preserved.
  • the front wheel 40 In unfolded configuration of the step 1, whether it supports a load or not, the front wheel 40 extends above the laying plane P. In practice, the wheel 40 before rests by gravity on the ground S, confused in this situation with the laying plane P.
  • the angular travel of the operating lever 47 is not necessarily important. In fact, in the illustrated example, this angular stroke is small, of the order of (or less than) about 15 °. It is sufficient that the extended position of the wheel 40 (or wheels) before causes a slight elevation of the uprights 3 before to allow the running of the step 1.
  • a second lever is provided on the other post 3 before, to ensure control of the tilting gear 39 rolling front two hands.
  • a crossbar can connect the levers to synchronize their tilting, in the manner of a panic bar fire door.
  • the gate 32 is movable between an open position (dashed on the figure 2 ) and a closed position (in solid line on the figure 2 ).
  • the gate 32 comprises a high rail 59 and a low rail 60 , each secured by a first end 61 to one of the barriers (in this case the barrier 24 left).
  • the high rail 59 is attached to the barrier 24 at the junction between the current hand 27 and the ramp 26, while the lowermost 60 is attached to the barrier 24 at the junction between the current hand 27 and the section 28. lower.
  • the rails 59, 60 are both semi-rigid, that is to say that they are not rigid in the manner of a metal profile, without being flexible in the manner of a thin rubber tube, or still a chain whose links would be free from each other (while being hooked to each other).
  • each rail 59, 60 is formed by association of a chain 62 with metal links (or rigid plastic) and a sheath 63 of plastic (or elastomer) in which is threaded the chain 62.
  • the length of the chain 62 is slightly greater than that of the sheath 63, so that only a few links of the chain 62 protrude from either side of the sheath 63 (typically one link on each side, as shown in the drawings).
  • each arm is in the form of a chain (preferably metal, especially steel) coated with a plastic material, typically a plastisol, typically based on PVC.
  • a plastic material typically a plastisol, typically based on PVC.
  • the coating of the chain is for example carried out by dipping in a plastisol bath, followed by drying in air or in an oven. This process gives the coated chain a semi-rigid character similar to the sheathing.
  • each rail 59, 60 to the barrier 24 is provided by its chain 62. This attachment can be made by riveting or by welding the end link on the barrier 24.
  • Each rail 59, 60 has a second end 64 opposite to the first 61, the second ends 64 of the rails 59, 60 being connected by a strip 65.
  • the strip 65 is fixed to the chains 62, and more precisely on end links of these, for example by riveting (or by screwing, or by welding).
  • the strip 65 is preferably rigid. It is for example made of a metallic material (or rigid plastic, for example PVC). As we see on the Figures 1 and 2 , The slide 65 has a U-shaped profile and has, in a closed position of the gate 32, fits onto the hand 27 of the current 25 opposite barrier (in this case the barrier 25 right) to the barrier 24 on which are directly fixed smooth 59, 60. the slider 65 is provided with removable hooking means 25 to the barrier against the barrier 24 to which are fixed the heald 59, 60.
  • removable fixing means are for example in the form of one (in the embodiment shown on the figure 1 ) or more (in the embodiment illustrated on the figure 2 ) cutout (s) buttonhole 66, the or each buttonhole 66 being adapted (s) to cooperate with a button 67 provided projecting on the hand 27 current.
  • the smooth 59, 60 hang freely, the strip 65 being detached from the barrier 25.
  • the user can freely access the floor 16, for example by using the 27 common hands during its rise.
  • the user grasps the strip 65 that fits on the current hand 27 of the barrier 25, by inserting the button 67 in the buttonhole 66 in a translation movement from top to bottom (to avoid any inadvertent withdrawal of the strip 65 ).
  • the rails 59, 60 thus extend transversely between the barriers 24, 25, themselves in the deployed position, the strip 65 being fitted on the hand 27 with the button 67 housed in the buttonhole 66 .
  • This embodiment of the gate 32 is advantageous in several ways.
  • the semi-rigid character of the rails 59, 60 makes it possible, in contrast to embodiments in which the rails are rigid, which require precise adjustments, to simplify manufacture.
  • the semi-rigid nature of the rails 59, 60 ensures, unlike soft heddles such as chains alone, a better maintenance of the user in danger of falling forward.
  • the hooking and unhooking of the strip 65 (and therefore of the door 32 ) by means of the strip 65 connecting the stringers 59, 56 can be made with one hand, for the benefit of the ergonomics and the simplicity of use.

Landscapes

  • Handcart (AREA)

Claims (7)

  1. Trittleiter (1), umfassend:
    - eine vordere Ebene (2), die ein Paar vordere Holme (3) und mindestens eine die vorderen Holme (3) verbindende Trittstufe (4) umfasst,
    - eine hintere Ebene (9), die gelenkig an der vorderen Ebene (2) montiert ist und ein Paar hintere Holme (10) und mindestens einen Stab (11) umfasst, der die hinteren Holme (10) verbindet, wobei die hinteren Holme (10) mit Enden (12) abschließen, die zusammen mit Enden (5) der vorderen Holme (3) eine Stellebene (P) für die Trittleiter (1) in einer ausgeklappten Position davon definieren, in der die hintere Ebene (9) einen Winkel mit der vorderen Ebene (2) bildet,
    - ein Paar einklappbare hintere Räder (33), die bezüglich der hinteren Ebene (9) zwischen einer eingezogenen Position, in der sich die hinteren Räder (33) oberhalb der Stellebene (P) erstrecken, und einer Einsatzposition, in der die hinteren Räder (33) über die Stellebene (P) nach unten hinausgehen, beweglich montiert sind, wobei jedes hintere Rad (33) durch eine Feder (34) zu seiner Einsatzposition hin beaufschlagt ist,
    - ein vorderes Fahrwerk (39), das eine Querstrebe (41) umfasst, die kippend zwischen den vorderen Holmen (3) montiert ist und an der mindestens ein einklappbares vorderes Rad (40) befestigt ist, wobei das vordere Fahrwerk (39) bezüglich der vorderen Ebene (2) zwischen einer eingezogenen Position, in der sich das mindestens eine vordere Rad (40) über der Stellebene (P) erstreckt, und einer Einsatzposition, in der das mindestens eine vordere Rad (40) über die Stellebene (P) nach unten hinausgeht, beweglich montiert ist,
    - einen Mechanismus (46) zur Betätigung des mindestens einen vorderen Rads (40),
    dadurch gekennzeichnet, dass der Betätigungsmechanismus (46) mindestens einen Handhabungshebel (47), der gelenkig an einem vorderen Holm (3) montiert ist, und eine Stange (48) umfasst, die am vorderen Holm (3) entlangläuft und den Hebel (47) an das vordere Fahrwerk (39) koppelt.
  2. Trittleiter (1) nach Anspruch 1, dadurch gekennzeichnet, dass der Hebel (47) in der Form eines Teils mit U-förmigem Querschnitt vorliegt, das den Holm (3) überspreizt.
  3. Trittleiter (1) nach Anspruch 2, dadurch gekennzeichnet, dass der Hebel (47) eine vordere Stützwand (50) und zwei seitliche Wände (51, 52) aufweist, die den Holm (3) einrahmen und durch die der Hebel (47) drehfest am Holm (3) ist.
  4. Trittleiter (1) nach Anspruch 3, dadurch gekennzeichnet, dass eine seitliche Wand (52) des Hebels (47) einen Endabschnitt aufweist, an dem ein oberes Ende (55) der Stange (48) drehverbunden ist.
  5. Trittleiter (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Querstrebe (41) mit einem rechtwinkligen Rücklauf (43) versehen ist, an dem ein unteres Ende (57) der Stange (48) drehverbunden ist.
  6. Trittleiter (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie eine am vorderen Holm (3) befestigte Führung (58) umfasst, in der die Stange (48) gleitend montiert ist.
  7. Trittleiter (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass jedes hintere Rad (33) mittels einer U-förmigen Befestigungsplatte (35) an einem hinteren Holm (10) befestigt ist, die einen Steg (36) und zwei quer vorstehende Arme (37) umfasst, wobei das Rad (33) am unteren Ende einer Stützachse (38) montiert ist, die unter Zwischenfügung der Feder (34) zum Gleiten an den Enden der Arme (37) eingepasst ist.
EP14168496.9A 2013-05-21 2014-05-15 Trittstufe mit einziehbaren Rädern, und mit einem handbedienten Schwenkvorderrad Active EP2806097B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1354521A FR3005986B1 (fr) 2013-05-21 2013-05-21 Marchepied muni de roues escamotables, dont une roue avant montee basculante avec commande manuelle

Publications (2)

Publication Number Publication Date
EP2806097A1 EP2806097A1 (de) 2014-11-26
EP2806097B1 true EP2806097B1 (de) 2016-07-06

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EP14168496.9A Active EP2806097B1 (de) 2013-05-21 2014-05-15 Trittstufe mit einziehbaren Rädern, und mit einem handbedienten Schwenkvorderrad

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FR (1) FR3005986B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201405841D0 (en) 2014-04-01 2014-05-14 Romax Technology Ltd Bearing Grease
FR3111940B1 (fr) 2020-06-29 2022-06-24 Cdh Group Battant de portillon pour plateforme de travail en hauteur et plateforme de travail comprenant un tel battant de portillon
FR3112570B1 (fr) 2020-07-15 2022-09-09 Cdh Group Dispositif de travail en hauteur a garde-corps articule et portillon automatique
FR3113695B1 (fr) 2020-08-27 2022-10-07 Cdh Group Dispositif de travail en hauteur a garde-corps articule et moyen de maintien en position repliee

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7411743U (de) * 1974-09-19 Hasenbach L Rollenbeschlag für Leitern bzw. Leiterböcke
DE522207C (de) * 1931-04-07 Franz Fenninger Feststellvorrichtung fuer fahrbare Stehleitern
DE3804306A1 (de) * 1988-02-09 1989-08-17 Herve Rousselot Stehleiter
CA2128300A1 (en) * 1993-08-12 1995-02-13 Roy B. Bendickson Ladder system including a caster bracket and method of forming
US6026931A (en) * 1998-10-26 2000-02-22 Emerson Electric Co. Support frame assembly
US6688426B1 (en) * 2002-03-02 2004-02-10 Harry Mikros Wheel extension and lift device for ladders

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EP2806097A1 (de) 2014-11-26
FR3005986A1 (fr) 2014-11-28
FR3005986B1 (fr) 2015-06-05

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