EP0014631B2 - Telescopic ladder structure - Google Patents
Telescopic ladder structure Download PDFInfo
- Publication number
- EP0014631B2 EP0014631B2 EP80400128A EP80400128A EP0014631B2 EP 0014631 B2 EP0014631 B2 EP 0014631B2 EP 80400128 A EP80400128 A EP 80400128A EP 80400128 A EP80400128 A EP 80400128A EP 0014631 B2 EP0014631 B2 EP 0014631B2
- Authority
- EP
- European Patent Office
- Prior art keywords
- ladder
- section
- scale
- plane
- sides
- 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.)
- Expired
Links
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 238000005452 bending Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C5/00—Ladders characterised by being mounted on undercarriages or vehicles Securing ladders on vehicles
- E06C5/02—Ladders characterised by being mounted on undercarriages or vehicles Securing ladders on vehicles with rigid longitudinal members
- E06C5/04—Ladders characterised by being mounted on undercarriages or vehicles Securing ladders on vehicles with rigid longitudinal members capable of being elevated or extended ; Fastening means during transport, e.g. mechanical, hydraulic
-
- 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
- E06C1/04—Ladders for resting against objects, e.g. walls poles, trees
- E06C1/08—Ladders for resting against objects, e.g. walls poles, trees multi-part
- E06C1/12—Ladders for resting against objects, e.g. walls poles, trees multi-part extensible, e.g. telescopic
Definitions
- the present invention relates to a telescopic ladder structure intended to be mounted on a motor vehicle, for example a fire fighting and rescue ladder.
- Ladders are already known which consist of a scale park comprising a certain number of telescopic elements called scale planes, which makes it possible to vary the developed length of the scale.
- each superimposed scale plane can be housed in the plane immediately below the folded-back state of the ladder while in the deployed state each superimposed plane remains partly embedded in the end of the plane immediately lower, the section of each plane being in the shape of a U whose two branches constitute the two identical blanks of each plane, which always have a constant height.
- the scales are generally characterized by the envelope of points in space capable of being reached by the end of the scale corresponding to a given state of charge. This envelope, called the usage diagram, results from the limitation imposed by the overturning stability of the vehicle or the carrying chassis, and from that imposed by the resistance to bending of the scale planes.
- the object of the invention is to resolve better than hitherto the weight-resistance compromise to which the structure of the scale must respond, that is to say to increase the payload weight ratio of the scale fleet ( either to increase the maximum admissible load at the end of the scale corresponding to a usage diagram corresponding to a given load) and also to improve the stability of the vehicle by relative lowering of the center of gravity of the weight scale equal.
- the telescopic rescue or rescue ladder according to the invention intended to be mounted on a transport vehicle, comprises several superimposed planes, each superimposed plane can be housed in the plane immediately below the folded state of the ladder, while in the deployed state each superimposed plane remains partly embedded in the end of the immediately lower plane, the section of each plane being in the form of a rigid U whose base is formed by the bars and the uprights of the ladder and the two branches by a lattice structure forming the two identical flanks of each plane, the flanks of the different planes having lower edges extending parallel to each other.
- the ladder of the invention is characterized in that the upper edges of each flank get closer and closer to the lower edges as one moves away from the embedding of the ladder on the vehicle transport, the sides of successive planes being of progressively decreasing height.
- FIGS. 1 and 2 are respectively represented in whole or in part of the emergency ladder systems of the known art, consisting of an assembly 1 called a ladder park, comprising several telescopic elements 2 called ladder planes, allowing to vary the developed length of the ladder.
- the scale park 1 is itself fixed on a frame 3 which makes it possible to draw up the scale by rotation of the assembly around the horizontal axis 4.
- a turret 5 allows the orientation in azimuth relative to the vehicle V, by rotation about a vertical axis 6.
- the section of the planes is generally in the form of a "U” made up of two flanks 7 giving resistance to bending and serving as a railing, connected by steps 8, each of the sides of each plan having, on the scales usually known, constant height.
- the arrangement according to the invention makes it possible to increase the height of the scale park in the part which does not come to line up above the cabin of the carrying vehicle and, in so doing, the resistance of the ladder planes is greatly improved since this part is the one which undergoes the greatest efforts.
- FIG. 1 the comparison of a conventional structure (FIG. 1) and a structure according to the invention (FIG. 3) of the same weight and composed of similar lattices highlights the possibility of increasing the payload at the end 33% scale in favor of the structure of the invention, while retaining identical stresses and deformations in the two structures.
- the systems for guiding the scale planes remain similar to what is already known, and FIG. 5 shows a possible arrangement.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ladders (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
- Emergency Lowering Means (AREA)
Abstract
Description
La présente invention se rapporte à une structure d'échelle télescopique destinée à être montée sur un véhicule automobile, par exemple une échelle de lutte contre l'incendie et de sauvetage. On connaît déjà des échelles constituées par un parc d'échelle comportant un certain nombre d'éléments télescopiques appelés plans d'échelle, ce qui permet de faire varier la longueur développée de l'échelle.The present invention relates to a telescopic ladder structure intended to be mounted on a motor vehicle, for example a fire fighting and rescue ladder. Ladders are already known which consist of a scale park comprising a certain number of telescopic elements called scale planes, which makes it possible to vary the developed length of the scale.
Dans les années 1920, on a déjà songé à monter sur véhicule des échelles télescopiques comportant deux plans d'échelle coulissant l'un par rapport à l'autre. Chaque plan d'échelle était à cette époque constitué par une échelle plane haubanée au moyen de deux mâts disposés perpendiculairement au plan de l'échelle et de tirants rattrapant les contraintes dues aux moments fléchissants (voir en particulier le prospectus n° 412 K édité par Merryweather and Sons Ltd à Londres).In the 1920s, thought was already given to mounting telescopic ladders on vehicles comprising two ladder planes sliding relative to each other. Each scale plan at that time consisted of a flat guyed ladder by means of two masts arranged perpendicular to the plan of the ladder and tie rods catching up with the stresses due to bending moments (see in particular prospectus n ° 412 K edited by Merryweather and Sons Ltd in London).
Par la suite la technique a évolué vers l'utilisation de plans d'échelle en U rigide.Thereafter the technique evolved towards the use of scale plans in rigid U.
C'est ainsi que chaque plan d'échelle superposé peut se loger dans le plan immédiatement inférieur à l'état reployé de l'échelle tandis qu'à l'état déployé chaque plan superposé reste en partie encastré dans l'extrémité du plan immédiatement inférieur, la section de chaque plan étant en forme d'un U dont les deux branches constituent les deux flans identiques de chaque plan, qui ont toujours une hauteur constante.This is how each superimposed scale plane can be housed in the plane immediately below the folded-back state of the ladder while in the deployed state each superimposed plane remains partly embedded in the end of the plane immediately lower, the section of each plane being in the shape of a U whose two branches constitute the two identical blanks of each plane, which always have a constant height.
On trouvera une illustration de telles échelles dans le FR-A-773 745.An illustration of such scales can be found in FR-A-773 745.
Les échelles sont généralement caractérisées par l'enveloppe de points de l'espace susceptibles d'être atteints par l'extrémité de l'échelle correspondant à un état de charge donné. Cette enveloppe, appelée diagramme d'utilisation, résulte de la limitation imposée par la stabilité au renversement du véhicule ou du châssis porteur, et de celle imposée par la résistance à la flexion des plans d'échelle.The scales are generally characterized by the envelope of points in space capable of being reached by the end of the scale corresponding to a given state of charge. This envelope, called the usage diagram, results from the limitation imposed by the overturning stability of the vehicle or the carrying chassis, and from that imposed by the resistance to bending of the scale planes.
L'invention a pour objet de mieux résoudre que jusqu'à présent le compromis poids-résistance auquel la structure de l'échelle doit répondre, c'est-à-dire d'accroître le rapport charge utile poids du parc d'échelle (soit pour augmenter la charge maximale admissible à l'extrémité de l'échelle correspondant à un diagramme d'utilisation correspondant à une charge donnée) et aussi d'améliorer la stabilité du véhicule par abaissement relatif du centre de gravité de l'échelle à poids égal.The object of the invention is to resolve better than hitherto the weight-resistance compromise to which the structure of the scale must respond, that is to say to increase the payload weight ratio of the scale fleet ( either to increase the maximum admissible load at the end of the scale corresponding to a usage diagram corresponding to a given load) and also to improve the stability of the vehicle by relative lowering of the center of gravity of the weight scale equal.
A cet effet, l'échelle télescopique de secours ou de sauvetage selon l'invention, destinée à être montée sur un véhicule de transport, comporte plusieurs plans superposés dont chaque plan superposé peut se loger dans le plan immédiatement inférieur à l'état reployé de l'échelle, tandis qu'à l'état déployé chaque plan superposé reste en partie encastré dans l'extrémité du plan immédiatement inférieur, la section de chaque plan étant en forme d'un U rigide dont la base est constituée par les barreaux et les montants de l'échelle et les deux branches par une structure en treillis formant les deux flancs identiques de chaque plan, les flancs des différents plans ayant des bords inférieurs s'étendant parallèlement entre eux. L'échelle de l'invention est caractérisée en ce que les bords supérieurs de chaque flanc se rapprochent de plus en plus des bords inférieurs au fur et à mesure que l'on s'éloigne de l'encastrement de l'échelle sur le véhicule de transport, les flancs des plans successifs étant de hauteur progressivement décroissante.To this end, the telescopic rescue or rescue ladder according to the invention, intended to be mounted on a transport vehicle, comprises several superimposed planes, each superimposed plane can be housed in the plane immediately below the folded state of the ladder, while in the deployed state each superimposed plane remains partly embedded in the end of the immediately lower plane, the section of each plane being in the form of a rigid U whose base is formed by the bars and the uprights of the ladder and the two branches by a lattice structure forming the two identical flanks of each plane, the flanks of the different planes having lower edges extending parallel to each other. The ladder of the invention is characterized in that the upper edges of each flank get closer and closer to the lower edges as one moves away from the embedding of the ladder on the vehicle transport, the sides of successive planes being of progressively decreasing height.
L'invention sera mieux comprise à la lecture de la description suivante d'une forme de réalisation, en référence aux dessins annexés, dans lesquels :
- la figure 1 représente une échelle de secours ou de sauvetage de type connu, montée sur un véhicule de transport ;
- la figure 2 est une vue perspective en détail des plans de l'échelle de la figure 1 ;
- la figure 3 est une vue latérale d'une échelle de secours ou de sauvetage selon l'invention, montée sur un véhicule de transport ;
- la figure 4 est une vue latérale de l'échelle selon l'invention, à l'état reployé;
- la figure 5 est une vue latérale de l'échelle selon l'invention, à l'état déployé ; et
- la figure 6 est une coupe transversale selon la ligne VI-VI de la figure 5.
- FIG. 1 represents a rescue or rescue ladder of known type, mounted on a transport vehicle;
- Figure 2 is a perspective view in detail of the plans of the ladder of Figure 1;
- Figure 3 is a side view of a rescue or rescue ladder according to the invention, mounted on a transport vehicle;
- Figure 4 is a side view of the ladder according to the invention, in the folded state;
- Figure 5 is a side view of the ladder according to the invention, in the deployed state; and
- FIG. 6 is a cross section along the line VI-VI of FIG. 5.
Sur les figures 1 et 2 sont respectivement représentés en tout ou en partie des systèmes d'échelle de secours de l'art connu, constitués d'un ensemble 1 appelé parc d'échelle, comprenant plusieurs éléments télescopiques 2 appelés plans d'échelle, permettant de faire varier la longueur développée de l'échelle. Le parc d'échelle 1 est lui-même fixé sur un bâti 3 qui permet de dresser l'échelle par rotation de l'ensemble autour de l'axe horizontal 4. Dans le cas où l'ensemble échelle est lié de façon permanente au véhicule porteur, une tourelle 5 permet l'orientation en azimut par rapport au véhicule V, par rotation autour d'un axe vertical 6.FIGS. 1 and 2 are respectively represented in whole or in part of the emergency ladder systems of the known art, consisting of an
La section des plans est généralement en forme de « U constitué de deux flancs 7 donnant la résistance à la flexion et servant de garde-fou, relié par des échelons 8, chacun des flancs de chaque plan ayant, sur les échelles habituellement connues, une hauteur constante.The section of the planes is generally in the form of a "U" made up of two
Dans la forme de réalisation selon l'invention, telle que représentée aux figures 3 à 6, sont agencés un certain nombre de plans d'échelles A, B, C, D... présentant des flancs de forme trapézoïdale dont les bords supérieurs 9a, 9b, 9c, 9d... ne sont pas parallèles aux bords inférieurs 10a, 10b, 10c, 10d mais disposés de telle sorte que la hauteur h1, h2, hs, h4 de chaque plan croisse vers l'extrémité du plan correspondant, qui reste encastrée dans la zone d'extrémité du plan immédiatement inférieur.In the embodiment according to the invention, as shown in Figures 3 to 6, are arranged a number of scale planes A, B, C, D ... having flanks of trapezoidal shape whose
Il est clair qu'avec un tel agencement le moment d'inertie de flexion des plans se trouve ainsi considérablement augmenté dans la zone où le moment fléchissant est maximal.It is clear that with such an arrangement the moment the plane bending inertia is thus considerably increased in the zone where the bending moment is maximum.
En outre, l'agencement selon l'invention permet d'augmenter la hauteur du parc d'échelle dans la partie ne venant pas se ranger au-dessus de la cabine du véhicule portant et, ce faisant, la résistance des plans d'échelles se trouve grandement améliorée puisque cette partie est celle qui subit les plus gros efforts. A titre d'exemple, la comparaison d'une structure classique (figure 1) et d'une structure selon l'invention (figure 3) de même poids et composée de treillis semblables fait ressortir la possibilité d'augmenter la charge utile en bout d'échelle de 33 % en faveur de la structure de l'invention, tout en conservant des contraintes et des déformations identiques dans les deux structures. Par ailleurs, les systèmes de guidage des plans d'échelles restent semblables à ce qui est déjà connu, et la figure 5 montre une disposition possible.In addition, the arrangement according to the invention makes it possible to increase the height of the scale park in the part which does not come to line up above the cabin of the carrying vehicle and, in so doing, the resistance of the ladder planes is greatly improved since this part is the one which undergoes the greatest efforts. By way of example, the comparison of a conventional structure (FIG. 1) and a structure according to the invention (FIG. 3) of the same weight and composed of similar lattices highlights the possibility of increasing the payload at the end 33% scale in favor of the structure of the invention, while retaining identical stresses and deformations in the two structures. Furthermore, the systems for guiding the scale planes remain similar to what is already known, and FIG. 5 shows a possible arrangement.
Claims (1)
- An emergency or rescue extension ladder intended to be mounted on a carrier vehicle (V), comprising several superimposed sections (A, B, C, D), each of which can be housed in the next section down in the retracted state of the ladder, whilst in the extended state each superimposed section remains partly housed in the end of the next section down, the cross-section of each section being in the form of a rigid U, the base of which is formed by the rungs and the uprights of the ladder and the two limbs by a lattice structure forming the two identical sides to each section, the sides of the different sections (A, B, C, D) having bottom edges (10a, 10b, 10c, 10d) running parallel to each other, characterised in that the top edges (9a, 9b, 9c, 9d) of each side get closer to the bottom edges the further away they are from the point of attachment of the ladder on the carrier vehicle (V), with the sides of successive sections having gradually decreasing heights (h,, h2, h3, h4).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT80400128T ATE4926T1 (en) | 1979-01-30 | 1980-01-25 | STRUCTURE OF AN EXTENDING LADDER. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7902298A FR2448028A1 (en) | 1979-01-30 | 1979-01-30 | TELESCOPIC LADDER STRUCTURE |
FR7902298 | 1979-01-30 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0014631A1 EP0014631A1 (en) | 1980-08-20 |
EP0014631B1 EP0014631B1 (en) | 1983-10-05 |
EP0014631B2 true EP0014631B2 (en) | 1987-05-27 |
Family
ID=9221347
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP80400128A Expired EP0014631B2 (en) | 1979-01-30 | 1980-01-25 | Telescopic ladder structure |
Country Status (8)
Country | Link |
---|---|
US (1) | US4317504A (en) |
EP (1) | EP0014631B2 (en) |
JP (1) | JPS56488A (en) |
AT (1) | ATE4926T1 (en) |
BR (1) | BR8000530A (en) |
DE (1) | DE3065097D1 (en) |
ES (1) | ES256662Y (en) |
FR (1) | FR2448028A1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6755258B1 (en) * | 2003-01-27 | 2004-06-29 | Smeal Fire Apparatus Co. | Aerial ladder fire fighting apparatus with positionable waterway |
US8413764B1 (en) * | 2009-09-29 | 2013-04-09 | David A. Cohen | Ladder safety device, systems and methods of arresting falls from ladders |
US8074767B1 (en) | 2010-08-08 | 2011-12-13 | Orville Douglas Denison | Aerial ladder system with powered rungs |
FR3024489B1 (en) * | 2014-07-29 | 2018-08-10 | Gimaex International | TELESCOPIC SCALE COMPRISING SCALE TRONCONS OF DIFFERENT DENSITY |
US9492695B2 (en) | 2014-11-24 | 2016-11-15 | Oshkosh Corporation | Pedestal and torque box assembly for a fire apparatus |
US9579530B2 (en) | 2014-11-24 | 2017-02-28 | Oshkosh Corporation | Ladder assembly for a fire apparatus |
US9677334B2 (en) | 2014-11-24 | 2017-06-13 | Oshkosh Corporation | Aerial ladder for a fire apparatus |
US9504863B2 (en) | 2014-11-24 | 2016-11-29 | Oshkosh Corporation | Quint configuration fire apparatus |
US9580962B2 (en) | 2014-11-24 | 2017-02-28 | Oshkosh Corporation | Outrigger assembly for a fire apparatus |
US10286239B2 (en) | 2017-02-08 | 2019-05-14 | Oshkosh Corporation | Fire apparatus piercing tip ranging and alignment system |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US380733A (en) * | 1888-04-10 | Ladder for city fire-department service | ||
FR630031A (en) * | 1927-02-24 | 1927-11-22 | Pylon | |
US2923381A (en) * | 1954-01-20 | 1960-02-02 | Cabot Shops Inc | Telescopic derrick and locking means therefor |
JPS483520U (en) * | 1971-05-21 | 1973-01-17 | ||
JPS50106500A (en) * | 1974-01-31 | 1975-08-21 | ||
US4094381A (en) * | 1977-05-02 | 1978-06-13 | Wilkerson Darrell F | Aerial extension ladder |
-
1979
- 1979-01-30 FR FR7902298A patent/FR2448028A1/en active Granted
-
1980
- 1980-01-25 DE DE8080400128T patent/DE3065097D1/en not_active Expired
- 1980-01-25 AT AT80400128T patent/ATE4926T1/en not_active IP Right Cessation
- 1980-01-25 EP EP80400128A patent/EP0014631B2/en not_active Expired
- 1980-01-28 BR BR8000530A patent/BR8000530A/en unknown
- 1980-01-29 ES ES1980256662U patent/ES256662Y/en not_active Expired
- 1980-01-29 US US06/116,407 patent/US4317504A/en not_active Expired - Lifetime
- 1980-01-29 JP JP839980A patent/JPS56488A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
US4317504A (en) | 1982-03-02 |
EP0014631A1 (en) | 1980-08-20 |
ES256662U (en) | 1981-07-01 |
JPS56488A (en) | 1981-01-06 |
ATE4926T1 (en) | 1983-10-15 |
FR2448028B1 (en) | 1982-06-25 |
EP0014631B1 (en) | 1983-10-05 |
BR8000530A (en) | 1980-10-14 |
FR2448028A1 (en) | 1980-08-29 |
DE3065097D1 (en) | 1983-11-10 |
ES256662Y (en) | 1981-12-16 |
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