FR2465062A1

FR2465062A1 - Light wooden ladder with perforated risers - uses riser bracing as rung fixing between parallel laminated runners

Info

Publication number: FR2465062A1
Application number: FR7923279A
Authority: FR
Original assignee: Individual
Current assignee: Individual
Priority date: 1979-09-14
Filing date: 1979-09-14
Publication date: 1981-03-20
Also published as: BE885545A; FR2465062B1; DE3033830A1

Abstract

Each riser is made of two or more parallel runners (1,2) connected at equidistance heights by bracing (4) to give the strength of a solid riser but at much less weight and cost. The runners are made of glued laminate wood and a central longitudinal hole is made in the laminate before gluing to take a steel reinforcing rod. The cross bracing has holes (5) to take the ladder rungs (7), the fixing can be either glued or dowel pins (8) can pass through holes in the bracing and through the rungs.

Description

Actuellement pour fabriquer des échelles en bois le conscruc- teur doit acheter 5 M3 de bois au CANADA ou autre pays pour réussir la fabrication de IM3 d'échelles. Les échelles construites en bois avec des montants pleins sont très lourdes et se trouvent concurrencées par des échelles en aluminium, duralumin, etc. qut sont très légères mais plus couteuses. Ces échelles ont de plus l'inconvénient d'être dangereuses étant conductrices d'électricité.Currently to make wooden ladders, the manufacturer must buy 5 M3 of wood in CANADA or another country to successfully manufacture IM3 ladders. Ladders constructed of wood with solid uprights are very heavy and compete with ladders made of aluminum, duralumin, etc. which are very light but more expensive. These ladders also have the disadvantage of being dangerous since they conduct electricity.

La présente invention concerne un nouveau procédé de fabrication d'une échelle.The present invention relates to a new method of manufacturing a ladder.

Cette fabrication a l'avantage de réaliser une échelle de 1/3 plus haute, avec la même quantité de bois employée, que l'échel- le traditionnelle. Cette échelle possède les mimes avantages que celle construite dans la tradition mais en plus a l'avantage d'utiliser presque toute la quantité de bois achetée (donc presque pas de chutes).This manufacturing has the advantage of achieving a scale of 1/3 higher, with the same quantity of wood used, than the traditional ladder. This ladder has the same advantages as that built in the tradition but in addition has the advantage of using almost all the quantity of wood purchased (therefore almost no scraps).

Description - Les montants de l'échelle se composent de deux ou plusieurs longerons de bois (i et 2 étant la construction la plus simple) réunis par collage ou autre avec des entretoises (4) de bois ou autre. Les longerons peuvent titre construits en lamellé collé pour permettre d'utiliser des bois les plus courts. Ces entretoises (4) sont percées (5) pour recevoir les échelons qui seront fixés par collage et par une broche (8) qui traversera les 3 éléments, soit les deux longerons lamellés collés et l'en- tretoise.Description - The uprights of the ladder consist of two or more wooden beams (i and 2 being the simplest construction) joined by gluing or other with spacers (4) of wood or other. The stringers can title built in glued laminated to allow the use of the shortest wood. These spacers (4) are drilled (5) to receive the rungs which will be fixed by gluing and by a spindle (8) which will pass through the 3 elements, ie the two glued laminated beams and the spacer.

Les broches peuvent entre retirées pour permettre le remplacement des échelons. Les entretoises (4)peuvent être de forme rectangulaire, losangée, carrée, trapézoidale ou aura. Les échelons (7) peuvent être en bois ou métal suivant l'utilisation de l''chelle. The pins can between removed to allow replacement of the rungs. The spacers (4) can be rectangular, lozenge-shaped, square, trapezoidal or aura. The rungs (7) can be made of wood or metal depending on the use of the ladder.

Pour avoir une rigidité plus grande il est nécessaire d'ajouter dans les longerons i et 2 pendant le collage des éléments de lamellés collés, à l'intérieur de ceux-ci, une tige en acier inox prise entre les lamelles après avoir préparé une gorge du diamètre de la tige. To have greater rigidity it is necessary to add into the longitudinal members i and 2 during the gluing of the glued laminated elements, inside these, a stainless steel rod taken between the lamellae after having prepared a groove the diameter of the rod.

Chaque montant peut entre composé de plusieurs éléments collés les uns par dessus les autres ce qui permet d'obtenir des résistances plus grandes puisque l'ont augmente leur hauteur.Each upright can be made up of several elements glued one on top of the other, which makes it possible to obtain greater resistances since they have increased their height.

L'accouplement de deux ou plusieurs éléments d'échelles pouvant coulisser les uns sur les autres permet d'obtenir de très grandes longueurs. Ces éléments d'échelles sont maintenus par des ferrures en haut et en bas fixées sur les montants tout en permets nit aux éléments d'entre mobiles en glissant les uns sur les autres.The coupling of two or more ladder elements which can slide on each other makes it possible to obtain very long lengths. These ladder elements are held by fittings at the top and bottom fixed on the uprights while allowing nit to the mobile entry elements by sliding on each other.

Ces éléments sont retenus par un systeme de blocage passant dans les trous des montants ce qui permet une sécurité meilleure que le blocage sur les échelons. These elements are retained by a blocking system passing through the holes of the uprights which allows better security than blocking on the rungs.

Claims

1 / Wooden assembly device intended to manufacture a ladder characterized by the fact that two or more longitudinal members assembled by gluing with spacers form one of the uprights of a Ladder.

2 / Device according to claim 1 characterized in that the spacers, bringing together the side members, are distant from each other. This assembly, thus made, Scotomizes the supply of wood and makes it possible to obtain a very light scale.

The amounts thus produced are perforated and lightened.

3 / Device according to claim 2 characterized in that the spacers interposed between the side members can between different shapes, square, rectangular, trapezoidal or other.

4 / Device according to claim 1 characterized in that the two uprights thus produced are joined by a rung of wood, metal or other placed in the holes of the two spacers placed at the ends of the rung.

5 / Device according to claim I characterized in that the beams can other solid wood or glued laminates allowing the use of all pieces of quality wood purchased without worrying about their lengths 6 / Device according to claim I characterized by the fact that during the manufacture of the glued laminated beams, a groove will be made in the center allowing a stainless steel wire to be placed, which will increase the load resistance of the upright.

7 / Device according to claim 3 characterized in that the fixing of the rungs thus placed in the hole of the spacer is made by pressure and is held by a pin joining the side members eh passing through the spacer and the rung.

8 / Device according to all the claims characterized by the fats that the uprights can have several longitudinal members assembled with spacers, this assembly increasing the height and making it possible to obtain very large resistances.

9 / Device according to the preceding claims characterized in that the coupling of pluckers scales allows to obtain scale: very light and very resistant slides.

I0 / Device according to the preceding claims, characterized in that it is possible to use the holes in the uprights between the spacers for blocking another arch.

This blocking in the holes of the upright stops and keeps the ladders coupled after their deployment.