WO1998051886A1 - Stay - Google Patents

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Publication number
WO1998051886A1
WO1998051886A1 PCT/IB1998/000727 IB9800727W WO9851886A1 WO 1998051886 A1 WO1998051886 A1 WO 1998051886A1 IB 9800727 W IB9800727 W IB 9800727W WO 9851886 A1 WO9851886 A1 WO 9851886A1
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WO
WIPO (PCT)
Prior art keywords
screw
forestay
outer tube
head
nut
Prior art date
Application number
PCT/IB1998/000727
Other languages
French (fr)
Inventor
Nicolas Bersier
Original Assignee
Etablissement Nanicoba
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Etablissement Nanicoba filed Critical Etablissement Nanicoba
Priority to AU72265/98A priority Critical patent/AU7226598A/en
Publication of WO1998051886A1 publication Critical patent/WO1998051886A1/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G25/00—Shores or struts; Chocks
    • E04G25/04—Shores or struts; Chocks telescopic
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G25/00—Shores or struts; Chocks
    • E04G25/04—Shores or struts; Chocks telescopic
    • E04G25/06—Shores or struts; Chocks telescopic with parts held together by positive means
    • E04G25/065—Shores or struts; Chocks telescopic with parts held together by positive means by a threaded nut
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G25/00—Shores or struts; Chocks
    • E04G25/04—Shores or struts; Chocks telescopic
    • E04G2025/042—Shores or struts; Chocks telescopic with devices to avoid accidental disengagement of the telescopic elements, e.g. during transport

Definitions

  • the subject of the present invention is a forestay of the type comprising a central screw movable axially in an external tube forming a support and passing through a head mounted to rotate on one end of this tube being at the top in the vertical working position of the forestay, a nut disposed in this head, angularly integral with the latter and formed by two angular portions of nut mounted in the head so as to be displaceable radially with respect to the screw, between a position of cooperation with the thread of the screw and a released position of this thread, means being provided to bring said nut parts into the disengaged position of the screw at will, in order to allow the screw to return by gravity to the lower position, these means being pivotally mounted on said nut parts .
  • This type of forestay has, as will be indicated below, a minor defect which the present invention aims to remedy. It relates to a forestay which conforms to claim 1.
  • Figures 1 to 5 and 5a relate to the example of a known type forestay which the invention aims to improve. It corresponds to what is described and claimed in the European patent published under No. 0349485 and in the United States patent No 4.966.345.
  • Fig. 1 is an elevational view.
  • Fig. 2 is a partial view of a detail in section along ll-ll of FIG. 1.
  • Fig. 3 is a sectional view along lll-lll of FIG. 1.
  • Fig. 4 is a partial view, in section on IV-IV of FIG. 3, showing certain parts in the working position of the forestay.
  • Fig. 5 is a partial view in FIG. 4 but showing the same parts in the position of non-cooperation of the nut with the screw.
  • Fig. 5a is a partial view, in section on IV-IV of FIG. 3, showing the cam system making it possible to separate the threading of the tube from the threading of the pawls.
  • Fig. 6 is a partial schematic view, in axial section, of the embodiment of the forestay according to the invention.
  • Fig. 7 is a sectional view along VII-VII of FIG. 6.
  • Fig. 8 is a partial view, at the end, of a variant.
  • Fig. 9 is a sectional view along IX-IX of FIG. 8.
  • Fig. 10 is a view similar to FIG. 9 but relating to a second variant.
  • the forestay shown in the drawing comprises a tube 1 forming a support and provided at one of its ends with a foot 2 intended to rest on the ground.
  • a screw 3, tubular, is disposed axially in the tube 1.
  • This screw is provided at its upper end with a support plate 4 similar to 2.
  • the lower end of this screw has no thread over a certain length, this is to prevent the forestay from being used beyond its maximum admissible extension.
  • the screw 3 passes through a head 5 intended to rotate on the upper end of the tube 1.
  • each of these nut parts is elongated and has only a small number (two in the example shown) of thread portions 7a, 7b, in the vicinity of its lower end.
  • the tube 1 has, at its upper part, an annular flare 8 which has two functions.
  • its conical interior (fig. 4) receives the load from the forestay and presses the conical lower end of the nut parts 6a, 6b, against the screw 3, thus ensuring the engagement of the portions of threads 7a, 7b of the nut parts 6a, 6b in the thread of the screw 3, when the members are in the position according to FIG. 4.
  • two symmetrical hooks 9a, 9b (fig. 2 and 3) located at the lower ends of the depressions 10a, 10b symmetrical of the head 5 come into contact with the outside of the flare 8, to retain the head 5 on tube 1, when transporting the forestay while keeping it tilted, head down.
  • the depressions 10a, 10b have the function of ensuring the centering of the head 5 on the screw 3 (fig. 3).
  • the nut parts 6a, 6b are each secured, respectively, to a pair of lugs 11a, 11b passing through holes in the head 5, arms 12a, 12b, are pivotally mounted each on the outer part of one of the pairs of legs 11a, 11b, respectively (fig. 1 and 3).
  • the head 5 has the shape of an oval bell flaring downwards, the ovalization being parallel to the axis of the center of the parts of the nuts so that the upper end of the parts of nuts 6a, 6b, is located between the upper part of this head and the screw 3, with a very small play, while downwards, the play is a little more important, allowing it only a limited oscillation, as the shows the difference between fig. 4 and fig. 5.
  • a part 15a, 15b forms a cam which comes, by oscillating the arms 12a, 12b, more than 90 ° upwards, in contact with the stops 17a, 17b , provided on the outer part of the nut parts 6a, 6b, in their part located between the tabs 11a, 11b (fig. 5a).
  • a groove 13 is formed in the outer and lower part of the nut parts 6a, 6b, and a split circular wire spring 16 of the circlip type is placed in this groove, to constantly urge these nut parts to remain constantly in engagement with the thread of the screw 3. Since the screw 3 is constantly attached to the head 5, the two symmetrical hooks 9a, 9b, of the said head automatically abut against the outer part of the flare 8, preventing any accidental dislocation of screw 3 when transporting the forestay inclined head down. It is only when desired that the nut parts 6a, 6b are disconnected from the screw 3 and for this, it is necessary to act on the arms 12a, 12b, as described above.
  • the threads of the screw 3 have sides of different inclination, as shown and explained in the publications cited in the introduction to this description.
  • the lower half of the thread has a fairly leaky oblique tangent to the axis of the screw.
  • the purpose of this part of the thread is to drive the parts of nuts 6a, 6b outward when the screw is given an upward movement, which allows the said screw to be brought quickly and effortlessly close to the working position of the plate 4.
  • the lower part of the flanks of the threading of the said screw brings the parts of nuts 6a, 6b, in the position according to fig. 5.
  • the upper half of the thread consists substantially of a quarter-circle profile whose tangent, in the upper part thereof, is substantially perpendicular to the axis of the screw. Its role is to retain the load that will be applied to the forestay when it is in the working position.
  • the safety devices 8, 9 automatically prevent the head 5 from accidentally leaving the support tube 1, and the safety device 16 automatically prevents the screw 3 from leaving the head 5, during transport of the inclined forestay, head down.
  • FIG. 6 schematically shows, in axial section, the screw 3 inside the tube 1 provided with the foot 2. For simplicity, the threads of the screw 3 have not been shown.
  • the screw 3 is provided, at its lower non-threaded end, with two short symmetrical bulges 20a, 20b, engaged, during manufacture, each in one of the gorges 19a, 19b. These bulges are produced by mechanical action when the screw 3 is engaged in the tube 1.
  • the projections 21a, 21b formed by the grooves 19a, 19b, on the outer surface of the tube 1 provide a more comfortable grip for the operator and therefore facilitate the angular immobilization of the tube 1.
  • the plates 2 and 4 remain angularly stationary.
  • the screw 3 cannot be dismantled and separated from the tube 1, which may be an advantage from the point of view of safety but a disadvantage in the event of necessary repair.
  • the bulges 20a, 20b of FIG. 6 are replaced by the following means: a circular plate 21 of equal diameter, apart from the clearance, the inside diameter of the non-threaded lower part of the screw 3, is introduced into this end and welded to the latter. Two symmetrical threaded holes 22a, 22b pass through this plate 21.
  • Two bumps 25a, 25b are arranged at the ends of the plate 23 and protrude outside the outside diameter of the lower part of the screw 3. The size of these bumps corresponds, apart from play, to that of the grooves 19a, 19b, in which they are engaged to angularly secure the tube 1 and the screw 3.
  • Two non-threaded holes 33a, 33b pass through the plate 23, their axes coincide with those of the threaded holes 22a, 22b.
  • the screws 24a, 24b pass freely through the holes 33a, 33b and are screwed into the threaded holes 22a, 22b.
  • the plates 21 and 23 of FIGS. 8 and 9 are replaced by two parts 26, 30.
  • the part 26 has a cylindrical extension 26a passing through a hole 3a made in the lower part of the screw 3.
  • This part 26a ends in a rounded head 28a playing the same role as 25a (fig. 8, 9).
  • the part 30 is of generally cylindrical shape and can slide in a corresponding hole 29 in the part 26, to reach the position shown in FIG.

Abstract

The stay comprises an external support-tube (1) in which can axially slide over a certain length a height-adjusting screw (3), axially actuated by a rotating nut (6a, 6b). To prevent said screw (3) from rotating when the nut (6a, 6b) rotates and from accidentally coming apart when the whole assembly is being manipulated, said screw (3) is made angularly integral with the external tube (1) by means (19a, 20a; 19b, 20b) which also prevent the screw (3) from having a too long and unwanted travel. Thus the screw cannot rotate when the nut (6a, 6b) is actuated while the external tube (1) is manually blocked and the screw (3) cannot accidentally come out of the external tube (1) when the whole assembly is manipulated.

Description

ETAI PROP
La présente invention a pour objet un étai du type comprenant une vis centrale mobile axialement dans un tube extérieur formant support et traversant une tête montée pour tourner sur une extrémité de ce tube se trouvant en haut en position verticale de travail de l'étai, un écrou disposé dans cette tête, solidaire angulairement de celle-ci et formé de deux portions angulaires d'écrou montées dans la tête pour être déplaçables radialement par rapport à la vis, entre une position de coopération avec le filet de la vis et une position dégagée de ce filet, des moyens étant prévus pour amener à volonté lesdites parties d'écrou en position dégagée de la vis, afin d'autoriser le retour par gravité de la vis en position inférieure, ces moyens étant montés pivotants sur lesdites parties d'écrou.The subject of the present invention is a forestay of the type comprising a central screw movable axially in an external tube forming a support and passing through a head mounted to rotate on one end of this tube being at the top in the vertical working position of the forestay, a nut disposed in this head, angularly integral with the latter and formed by two angular portions of nut mounted in the head so as to be displaceable radially with respect to the screw, between a position of cooperation with the thread of the screw and a released position of this thread, means being provided to bring said nut parts into the disengaged position of the screw at will, in order to allow the screw to return by gravity to the lower position, these means being pivotally mounted on said nut parts .
Ce genre d'étai présente, comme il sera indiqué plus loin, un défaut mineur auquel la présente invention vise à remédier. Elle a pour objet un étai qui est conforme à la revendication 1.This type of forestay has, as will be indicated below, a minor defect which the present invention aims to remedy. It relates to a forestay which conforms to claim 1.
Le dessin annexé représente à titre d'exemples, d'une part, une forme d'exécution du type d'étai auquel s'applique l'invention, et, d'autre part, une forme d'exécution et des variantes de l'étai selon l'invention.The accompanying drawing shows by way of example, on the one hand, an embodiment of the type of forestay to which the invention applies, and, on the other hand, an embodiment and variants of the was according to the invention.
Les figures 1 à 5 et 5a se rapportent à l'exemple d'étai de type connu que l'invention vise à perfectionner. Il correspond à ce qui est décrit et revendiqué dans le brevet européen publié sous le No 0349485 et au brevet des Etats-Unis No 4.966.345.Figures 1 to 5 and 5a relate to the example of a known type forestay which the invention aims to improve. It corresponds to what is described and claimed in the European patent published under No. 0349485 and in the United States patent No 4.966.345.
Fig. 1 est une vue en élévation.Fig. 1 is an elevational view.
Fig. 2 est une vue partielle d'un détail en coupe selon ll-ll de fig. 1.Fig. 2 is a partial view of a detail in section along ll-ll of FIG. 1.
Fig. 3 est une vue en coupe selon lll-lll de fig. 1.Fig. 3 is a sectional view along lll-lll of FIG. 1.
Fig. 4 est une vue partielle, en coupe selon IV-IV de fig. 3, montrant certaines parties en position de travail de l'étai. Fig. 5 est une vue partielle à fig. 4 mais montrant les mêmes parties en position de non coopération de l'écrou avec la vis.Fig. 4 is a partial view, in section on IV-IV of FIG. 3, showing certain parts in the working position of the forestay. Fig. 5 is a partial view in FIG. 4 but showing the same parts in the position of non-cooperation of the nut with the screw.
Fig. 5a est une vue partielle, en coupe selon IV-IV de fig. 3, montrant le système de came permettant de désolidariser le filetage du tube du filetage des cliquets.Fig. 5a is a partial view, in section on IV-IV of FIG. 3, showing the cam system making it possible to separate the threading of the tube from the threading of the pawls.
Fig. 6 est une vue schématique partielle, en coupe axiale, de la forme d'exécution de l'étai selon l'invention.Fig. 6 is a partial schematic view, in axial section, of the embodiment of the forestay according to the invention.
Fig. 7 est une vue en coupe selon VII-VII de fig. 6.Fig. 7 is a sectional view along VII-VII of FIG. 6.
Fig. 8 est une vue partielle, en bout, d'une variante.Fig. 8 is a partial view, at the end, of a variant.
Fig. 9 est une vue en coupe selon IX-IX de fig. 8.Fig. 9 is a sectional view along IX-IX of FIG. 8.
Fig. 10 est une vue analogue à la fig. 9 mais relative à une seconde variante.Fig. 10 is a view similar to FIG. 9 but relating to a second variant.
L'étai représenté sur le dessin comprend un tube 1 formant support et muni à l'une de ses extrémités d'un pied 2 prévu pour reposer sur le sol. Une vis 3, tubulaire, est disposée axialement dans le tube 1. Cette vis est munie à son extrémité supérieure d'une plaque d'appui 4 analogue à 2. L'extrémité inférieure de cette vis est dépourvue de filetage sur une certaine longueur, ceci pour éviter que l'étai ne soit utilisé au delà de son extension maximale admissible. La vis 3 passe à travers une tête 5 prévue pour tourner sur l'extrémité supérieure du tube 1.The forestay shown in the drawing comprises a tube 1 forming a support and provided at one of its ends with a foot 2 intended to rest on the ground. A screw 3, tubular, is disposed axially in the tube 1. This screw is provided at its upper end with a support plate 4 similar to 2. The lower end of this screw has no thread over a certain length, this is to prevent the forestay from being used beyond its maximum admissible extension. The screw 3 passes through a head 5 intended to rotate on the upper end of the tube 1.
A l'intérieur de la tête tournante 5 sont disposés deux parties angulaires d'écrou 6a, 6b s'étendant chacune sur un angle égal ou inférieur à 180°. Chacune de ces parties d'écrou est de forme allongée et présente un petit nombre seulement (deux dans l'exemple représenté) de portions de filets 7a, 7b, dans le voisinage de son extrémité inférieure.Inside the rotating head 5 are arranged two angular nut parts 6a, 6b each extending over an angle equal to or less than 180 °. Each of these nut parts is elongated and has only a small number (two in the example shown) of thread portions 7a, 7b, in the vicinity of its lower end.
Le tube 1 présente, à sa partie supérieure, un évasement annulaire 8 qui a deux fonctions. D'une part, son intérieur conique (fig. 4) reçoit la charge de l'étai et presse l'extrémité inférieure conique des parties d'écrou 6a, 6b, contre la vis 3, assurant ainsi l'engagement des portions de filets 7a, 7b des parties d'écrous 6a, 6b dans le filet de la vis 3, lorsque les organes sont dans la position selon fig. 4. D'autre part, deux crochets symétriques 9a, 9b (fig. 2 et 3) situés aux extrémités inférieures des dépressions 10a, 10b symétriques de la tête 5 viennent en contact avec l'extérieur de l'évasement 8, pour retenir la tête 5 sur le tube 1 , lorsque l'on transporte l'étai en le tenant incliné, la tête vers le bas.The tube 1 has, at its upper part, an annular flare 8 which has two functions. On the one hand, its conical interior (fig. 4) receives the load from the forestay and presses the conical lower end of the nut parts 6a, 6b, against the screw 3, thus ensuring the engagement of the portions of threads 7a, 7b of the nut parts 6a, 6b in the thread of the screw 3, when the members are in the position according to FIG. 4. On the other hand, two symmetrical hooks 9a, 9b (fig. 2 and 3) located at the lower ends of the depressions 10a, 10b symmetrical of the head 5 come into contact with the outside of the flare 8, to retain the head 5 on tube 1, when transporting the forestay while keeping it tilted, head down.
Les dépressions 10a, 10b ont la fonction d'assurer le centrage de la tête 5 sur la vis 3 (fig. 3).The depressions 10a, 10b have the function of ensuring the centering of the head 5 on the screw 3 (fig. 3).
Les parties d'écrou 6a, 6b sont solidaires chacune, respectivement, d'une paires de pattes 11a, 11b traversant des trous de la tête 5, Des bras 12a, 12b, sont montés pivotants chacun sur la partie extérieure de l'une des paires de pattes 11a, 11b, respectivement (fig. 1 et 3).The nut parts 6a, 6b are each secured, respectively, to a pair of lugs 11a, 11b passing through holes in the head 5, arms 12a, 12b, are pivotally mounted each on the outer part of one of the pairs of legs 11a, 11b, respectively (fig. 1 and 3).
Comme on le voit sur les fig. 1 , 4 et 5, la tête 5 a la forme d'une cloche ovale s'évasant vers le bas, l'ovalisation étant parallèle à l'axe du centre des parties d'ecrous ce qui fait que l'extrémité supérieure des parties d'ecrous 6a, 6b, se trouve entre la partie supérieure de cette tête et la vis 3, avec un jeu très faible, alors que vers le bas, le jeu est un peu plus important, lui permettant seulement une oscillation limitée, comme le montre la différence entre la fig. 4 et la fig. 5.As seen in Figs. 1, 4 and 5, the head 5 has the shape of an oval bell flaring downwards, the ovalization being parallel to the axis of the center of the parts of the nuts so that the upper end of the parts of nuts 6a, 6b, is located between the upper part of this head and the screw 3, with a very small play, while downwards, the play is a little more important, allowing it only a limited oscillation, as the shows the difference between fig. 4 and fig. 5.
Sur la fig. 4 on voit la tête 5 dans sa position inférieure, ou de travail, où les extrémités inférieures extérieures coniques des parties d'ecrous 6a, 6b, sont engagées à fond dans la partie intérieure conique de l'évasement 8. Cette position s'acquiert automatiquement par la gravité exercée sur les pattes 11a, 11 b et sur les bras 12a, 12b. Pour amener la tête 5 dans la position de dégagement de la vis représentée sur la fig. 5, il est prévu les moyens suivants. Sur la tête 14a, 14b des bras 12a, 12b, une partie 15a, 15b, forme une came qui vient, en faisant osciller les bras 12a, 12b, de plus de 90° vers le haut, en contact avec les butées 17a, 17b, prévues sur la partie extérieure des parties d'ecrous 6a, 6b, dans leur partie située entre les pattes 11a, 11b (fig. 5a). La rencontre de ces deux cames 15a, 15b, avec les butées 17a, 17b, des parties d'ecrous 6a, 6b, rend solidaire les bras 12a, 12b, des parties d'ecrous 6a, 6b, ce qui permet, en continuant de pousser vers le haut les bras 12a, 12b, d'imprimer à la partie inférieure des parties d'ecrous 6a, 6b, un mouvement basculant circulaire, mais qui peut être qualifié de sensiblement horizontal, vu sa très faible amplitude. Ce mouvement amène les parties d'ecrous 6a, 6b, en position dégagée selon fig. 5, les points d'appui se situant en 18a, 18b. Ces points d'appui 18a, 18b, étant dépourvus de filetage, donc lisses, rien ne retient la vis et elle tombe par gravité dans sa position inférieure où la plaque 4 s'approche sensiblement de la tête 5. Dès qu'on cesse de pousser les bras 12a, 12b, vers le haut, la tête 5 et les parties d'ecrous 6a, 6b, reviennent automatiquement dans la position selon fig. 4.In fig. 4 we see the head 5 in its lower position, or working, where the outer conical lower ends of the nut parts 6a, 6b, are fully engaged in the conical inner part of the flare 8. This position is acquired automatically by the gravity exerted on the legs 11a, 11b and on the arms 12a, 12b. To bring the head 5 into the release position of the screw shown in FIG. 5, the following means are provided. On the head 14a, 14b of the arms 12a, 12b, a part 15a, 15b, forms a cam which comes, by oscillating the arms 12a, 12b, more than 90 ° upwards, in contact with the stops 17a, 17b , provided on the outer part of the nut parts 6a, 6b, in their part located between the tabs 11a, 11b (fig. 5a). The meeting of these two cams 15a, 15b, with the stops 17a, 17b, of the parts of nuts 6a, 6b, makes the arms 12a, 12b, parts of nuts 6a, 6b, which allows, continuing pushing the arms 12a, 12b upwards, to impart to the lower part of the nut parts 6a, 6b, a circular rocking movement, but which can be qualified as substantially horizontal, given its very small amplitude. This movement brings the parts of nuts 6a, 6b, in the released position according to fig. 5, the support points being located at 18a, 18b. These support points 18a, 18b, being without thread, therefore smooth, nothing retains the screw and it falls by gravity into its lower position where the plate 4 approaches substantially the head 5. As soon as we stop push the arms 12a, 12b, upwards, the head 5 and the nut parts 6a, 6b, automatically return to the position according to fig. 4.
Pour éviter tout risque que la vis s'échappe hors des parties d'ecrous 6a, 6b et de la tête 5 (et par conséquent aussi hors du tube 1 ) lors d'un transport de l'étai en position inclinée, la tête vers le bas, il est prévu le moyen de sécurité suivant.To avoid any risk of the screw escaping from the nut parts 6a, 6b and from the head 5 (and therefore also from the tube 1) during transport of the forestay in an inclined position, the head towards below, the following security means are provided.
Une gorge 13 est pratiquée dans la partie extérieure et inférieure des parties d'ecrous 6a, 6b, et un ressort en fil circulaire fendu 16 du genre circlip est disposé dans cette gorge, pour solliciter constamment ces partie d'ecrous à rester constamment en prise avec le filet de la vis 3. La vis 3 étant donc constamment solidaire de la tête 5, les deux crochets symétriques 9a, 9b, de la dite tête viennent automatiquement buter contre la partie extérieure de l'évasement 8, empêchant tout déboîtement accidentel de la vis 3 lors du transport de l'étai incliné tête vers le bas. Ce n'est que lorsqu'on le veut que les parties d'ecrous 6a, 6b, sont déconnectées de la vis 3 et pour cela, il faut agir sur les bras 12a, 12b, selon description ci- dessus.A groove 13 is formed in the outer and lower part of the nut parts 6a, 6b, and a split circular wire spring 16 of the circlip type is placed in this groove, to constantly urge these nut parts to remain constantly in engagement with the thread of the screw 3. Since the screw 3 is constantly attached to the head 5, the two symmetrical hooks 9a, 9b, of the said head automatically abut against the outer part of the flare 8, preventing any accidental dislocation of screw 3 when transporting the forestay inclined head down. It is only when desired that the nut parts 6a, 6b are disconnected from the screw 3 and for this, it is necessary to act on the arms 12a, 12b, as described above.
Les filets de la vis 3 ont des flancs d'inclinaison différente, comme montré et expliqué dans les publications citées dans l'introduction de cette description. La moitié inférieure du filetage possède une tangente oblique assez fuyante par rapport à l'axe de la vis. Cette partie du filetage a pour mission de chasser les parties d'ecrous 6a, 6b, vers l'extérieur lorsqu'on imprime à la vis un mouvement ascendant, ce qui permet d'amener rapidement et sans effort la dite vis tout près de la position de travail de la plaque 4. Durant cette montée de la vis 3, la partie inférieure des flancs du filetage de la dite vis amène les parties d'ecrous 6a, 6b, dans la position selon fig. 5.The threads of the screw 3 have sides of different inclination, as shown and explained in the publications cited in the introduction to this description. The lower half of the thread has a fairly leaky oblique tangent to the axis of the screw. The purpose of this part of the thread is to drive the parts of nuts 6a, 6b outward when the screw is given an upward movement, which allows the said screw to be brought quickly and effortlessly close to the working position of the plate 4. During this rise of the screw 3, the lower part of the flanks of the threading of the said screw brings the parts of nuts 6a, 6b, in the position according to fig. 5.
La moitié supérieure du filetage est sensiblement constituée d'un profil en quart de cercle dont la tangente, dans la partie supérieure de celui-ci, est sensiblement perpendiculaire à l'axe de la vis. Son rôle est de retenir la charge qui sera appliqué sur l'étai lorsque celui-ci sera en position de travail.The upper half of the thread consists substantially of a quarter-circle profile whose tangent, in the upper part thereof, is substantially perpendicular to the axis of the screw. Its role is to retain the load that will be applied to the forestay when it is in the working position.
Les grands déplacements de la vis 3, dans les deux sens, peuvent être réalisés rapidement, sans qu'il soit nécessaire de tourner l'écrou. Seul le réglage fin se fait par une rotation très brève de la tête 5, en principe, au maximum un tour et quelques degrés.Large displacements of the screw 3, in both directions, can be carried out quickly, without the need to turn the nut. Only the fine adjustment is made by a very brief rotation of the head 5, in principle, at most one revolution and a few degrees.
Les sécurités 8, 9 empêchent automatiquement la tête 5 de quitter accidentellement le tube support 1 , et la sécurité 16 empêche automatiquement la vis 3 de quitter la tête 5, lors d'un transport de l'étai incliné, la tête vers le bas.The safety devices 8, 9 automatically prevent the head 5 from accidentally leaving the support tube 1, and the safety device 16 automatically prevents the screw 3 from leaving the head 5, during transport of the inclined forestay, head down.
La construction connue décrite jusqu'ici présente, malgré ses avantages, un défaut auquel la présente invention remédie. Ce défaut consiste en ceci : Lorsqu'on fait tourner la tête 5 pour amener, lors du réglage fin, la plaque 4 en position supérieure de travail, la vis 3 tourne aussi, ce qui empêche naturellement l'étai d'acquérir sa longueur recherchée. Lorsque la partie de la vis 3 située au dessus de la tête 5 est à portée de la main, il suffit de serrer la vis 3 d'une main pour l'immobiliser angulairement et amener ainsi l'étai à la longueur souhaitée en tournant de l'autre main la tête 5. Lors de l'utilisation d'étais de grande longueur, où la partie de la vis 3 située immédiatement au dessus de la tête 5 est hors de portée de la main de l'opérateur, celui-ci doit monter sur un gradin ou sur des tréteaux pour pouvoir amener l'étai à la longueur souhaitée, ce qui n'est évidemment pas très pratique.The known construction described so far has, despite its advantages, a defect which the present invention remedies. This defect consists in this: When the head 5 is rotated to bring, during the fine adjustment, the plate 4 to the upper working position, the screw 3 also rotates, which naturally prevents the forestay from acquiring its desired length . When the part of the screw 3 located above the head 5 is within reach of the hand, it suffices to tighten the screw 3 with one hand to immobilize it angularly and thus bring the forestay to the desired length by turning the other hand the head 5. When using long struts, where the part of the screw 3 located immediately above the head 5 is out of reach of the operator's hand, the operator must climb on a step or on trestles to be able to bring the forestay to the desired length, which is obviously not very practical.
On va décrire maintenant, en référence aux fig. 6 et 7 une forme d'exécution de l'étai selon la présente invention.We will now describe, with reference to FIGS. 6 and 7 an embodiment of the forestay according to the present invention.
La figure 6 montre schématiquement, en coupe axiale, la vis 3 à l'intérieur du tube 1 muni du pied 2. Pour simplifier on n'a pas représenté les filets de la vis 3.FIG. 6 schematically shows, in axial section, the screw 3 inside the tube 1 provided with the foot 2. For simplicity, the threads of the screw 3 have not been shown.
Il est formé dans le tube 1 , par action mécanique, deux gorges longitudinales rectilignes, 19a, 19b, disposées symétriquement et s'étendant de l'extrémité soudée à la plaque 2 jusqu'à une certaine distance de l'évasement conique 8.It is formed in the tube 1, by mechanical action, two rectilinear longitudinal grooves, 19a, 19b, arranged symmetrically and extending from the end welded to the plate 2 up to a certain distance from the conical flare 8.
La vis 3 est pourvu, à son extrémité inférieure non filetée, de deux courts renflements symétriques 20a, 20b, engagées, lors de la fabrication, chacun dans l'une des gorges 19a, 19b. Ces renflements sont réalisés par action mécanique lorsque la vis 3 est engagée dans le tube 1.The screw 3 is provided, at its lower non-threaded end, with two short symmetrical bulges 20a, 20b, engaged, during manufacture, each in one of the gorges 19a, 19b. These bulges are produced by mechanical action when the screw 3 is engaged in the tube 1.
La coopération des renflements 20a, 20b avec les gorges 19a, 19b empêche la vis 3 de tourner par rapport au tube 1. Pour empêcher que la vis 3 ne soit entraîné en rotation par la tête 5, il suffit d'immobiliser le tube 1 en le serrant à la main. Les saillies 21a, 21b que forment les gorges 19a, 19b, sur la surface extérieure du tube 1 offrent une prise à la main de l'opérateur plus confortable et facilitent donc l'immobilisation angulaire du tube 1. Ainsi, pendant l'actionnement de la tête 5, les plaques 2 et 4 restent angulairement immobiles.The cooperation of the bulges 20a, 20b with the grooves 19a, 19b prevents the screw 3 from rotating relative to the tube 1. To prevent the screw 3 from being rotated by the head 5, it is sufficient to immobilize the tube 1 in squeezing it by hand. The projections 21a, 21b formed by the grooves 19a, 19b, on the outer surface of the tube 1 provide a more comfortable grip for the operator and therefore facilitate the angular immobilization of the tube 1. Thus, during actuation of the head 5, the plates 2 and 4 remain angularly stationary.
Dans cet exemple, la vis 3 ne peut pas être démontée et séparée du tube 1 , ce qui peut être un avantage du point de vue de la sécurité mais un inconvénient en cas de réparation nécessaire.In this example, the screw 3 cannot be dismantled and separated from the tube 1, which may be an advantage from the point of view of safety but a disadvantage in the event of necessary repair.
Dans les variantes selon fig. 8 et 9, la construction permet, en cas de besoin, d'extraire la vis 3 du tube 1.In the variants according to fig. 8 and 9, the construction allows, if necessary, to extract the screw 3 from the tube 1.
A cet effet, les renflements 20a, 20b de la fig. 6 sont remplacées par les moyens suivants : une plaque circulaire 21 de diamètre égal, au jeu près, au diamètre intérieur de la partie inférieure non filetée de la vis 3, est introduite dans cette extrémité et soudée à cette dernière. Deux trous filetés symétriques 22a, 22b traversent cette plaque 21. Une seconde plaque, 23, de forme générale rectangulaire, dont les extrémités arrondies coïncident avec la surface extérieure de l'extrémité de la vis 3, est appliquée contre la plaque 21 et contre la face terminale de la vis 3, au moyen de deux vis 24a, 24b. Deux bosses 25a, 25b sont aménagées aux extrémités de la plaque 23 et dépassent hors du diamètre extérieur de la partie inférieure de la vis 3. La grandeur de ces bosses correspond, au jeu près, à celle des gorges 19a, 19b, dans lesquelles elles sont engagées pour solidariser angulairement le tube 1 et la vis 3.To this end, the bulges 20a, 20b of FIG. 6 are replaced by the following means: a circular plate 21 of equal diameter, apart from the clearance, the inside diameter of the non-threaded lower part of the screw 3, is introduced into this end and welded to the latter. Two symmetrical threaded holes 22a, 22b pass through this plate 21. A second plate, 23, of generally rectangular shape, the rounded ends of which coincide with the external surface of the end of the screw 3, is applied against the plate 21 and against the end face of the screw 3, by means of two screws 24a, 24b. Two bumps 25a, 25b are arranged at the ends of the plate 23 and protrude outside the outside diameter of the lower part of the screw 3. The size of these bumps corresponds, apart from play, to that of the grooves 19a, 19b, in which they are engaged to angularly secure the tube 1 and the screw 3.
Deux trous non filetés 33a, 33b traversent la plaque 23, Leurs axes coïncident avec ceux des trous filetés 22a, 22b. Les vis 24a, 24b passent librement à travers les trous 33a, 33b et sont vissées dans les trous filetés 22a, 22b. Dans la deuxième variante, représentée sur la fig. 10, les plaques 21 et 23 des fig. 8 et 9 sont remplacées par deux pièces 26, 30. La pièce 26 présente une extension cylindrique 26a traversant un trou 3a pratiqué dans la partie inférieure de la vis 3. Cette partie 26a se termine par une tête arrondie 28a jouant le même rôle que 25a (fig. 8, 9). La pièce 30 est de forme générale cylindrique et peut glisser dans un trou correspondant 29 de la pièce 26, pour atteindre la position représentée sur la fig. 10, où elle traverse un trou 3 b de la vis 3, symétrique à 3a. L'extrémité de droite sur cette figure 10 de cette pièce 30 se termine par une tête arrondie 28b jouant le même rôle que 25b (fig. 8 et 9). Lorsque les pièces 26 et 30 ont été mises en place exactement dans l'intérieur de la vis, elles sont immobilisées au moyen d'une vis 31 à pointeau engagée dans un trou fileté transversal 32 de la pièce 26, de telle façon que son extrémité pointue 33 soit engagée dans une gorge circulaire 34 de la pièce 30. Pour permettre d'insérer aisément les deux extrémités 28a, 28b dans les trous 3a, 3b, un ressort en spirale 35 est logé dans la cavité 29 de la pièce 26, de façon à ce que les deux extrémités 28a, 28b se mettent automatiquement en place dans les trous 3a, 3b, lors du montage ou du remontage. Two non-threaded holes 33a, 33b pass through the plate 23, their axes coincide with those of the threaded holes 22a, 22b. The screws 24a, 24b pass freely through the holes 33a, 33b and are screwed into the threaded holes 22a, 22b. In the second variant, shown in FIG. 10, the plates 21 and 23 of FIGS. 8 and 9 are replaced by two parts 26, 30. The part 26 has a cylindrical extension 26a passing through a hole 3a made in the lower part of the screw 3. This part 26a ends in a rounded head 28a playing the same role as 25a (fig. 8, 9). The part 30 is of generally cylindrical shape and can slide in a corresponding hole 29 in the part 26, to reach the position shown in FIG. 10, where it passes through a hole 3b of the screw 3, symmetrical to 3a. The right end in this figure 10 of this part 30 ends with a rounded head 28b playing the same role as 25b (fig. 8 and 9). When the parts 26 and 30 have been placed exactly in the interior of the screw, they are immobilized by means of a needle screw 31 engaged in a transverse threaded hole 32 of the part 26, so that its end point 33 is engaged in a circular groove 34 of the part 30. To allow easy insertion of the two ends 28a, 28b in the holes 3a, 3b, a spiral spring 35 is housed in the cavity 29 of the part 26, so that the two ends 28a, 28b are automatically placed in the holes 3a, 3b, during assembly or reassembly.

Claims

Revendications claims
1. Etai du type comprenant une vis centrale (3) mobile axialement dans un tube extérieur (1 ) formant support et traversant une tête (5) montée pour tourner sur l'extrémité de ce tube (1 ) se trouvant en haut en position verticale de travail de l'étai, un écrou disposé dans cette tête, solidaire angulairement de celle-ci et formé de deux portions angulaires d'écrou (6a, 6b) montées dans la tête (5) pour être déplaçable radialement par rapport à la vis (3), entre une position de coopération avec le filet de la vis (3) et une position dégagée de ce filet , des moyens (12a, 12b; 15a, 15b; 17a, 17b) étant prévus pour amener à volonté lesdites parties d'écrou (6a, 6b) en position dégagée de la vis (3), afin d'autoriser le retour par gravité de la vis en position inférieure, ces moyens étant montés pivotants sur lesdites parties d'écrou (6a, 6b), caractérisés en ce que le tube extérieur (1 ) et la vis (3) disposée pour glisser en son intérieur présentent des moyens (19a, 20a; 19b, 20b) solidarisant angulairement la vis (3) et le tube extérieur (1 ).1. Forestay of the type comprising a central screw (3) movable axially in an outer tube (1) forming a support and passing through a head (5) mounted to rotate on the end of this tube (1) located at the top in a vertical position working of the forestay, a nut disposed in this head, angularly integral with the latter and formed by two angular portions of nut (6a, 6b) mounted in the head (5) to be displaceable radially with respect to the screw (3), between a position of cooperation with the thread of the screw (3) and a position released from this thread, means (12a, 12b; 15a, 15b; 17a, 17b) being provided to bring said parts at will. 'nut (6a, 6b) in the disengaged position of the screw (3), in order to allow the return by gravity of the screw in the lower position, these means being pivotally mounted on said nut parts (6a, 6b), characterized in that the outer tube (1) and the screw (3) arranged to slide inside it have means (19a, 20a; 19b, 20b) angularly securing the screw (3) and the outer tube (1).
2. Etai selon la revendication 1 , caractérisé en ce que ces moyens empêchant un mouvement de rotation relatif de la vis (3) par rapport au tube extérieur (1 ) comprennent au moins deux gorges (19a, 19b) intérieures, rectilignes et longitudinales du tube extérieur (1 ), et des saillies (20a, 20b) prévues sur la partie inférieure non filetée de la vis (3), qui sont engagées chacune dans l'une de ces gorges (19a, 19b).2. Forestay according to claim 1, characterized in that these means preventing a relative rotational movement of the screw (3) relative to the outer tube (1) comprise at least two grooves (19a, 19b) inside, rectilinear and longitudinal of the outer tube (1), and projections (20a, 20b) provided on the lower non-threaded part of the screw (3), which are each engaged in one of these grooves (19a, 19b).
3. Etai selon la revendication 2, caractérisé en ce que lesdites gorges (19a, 19b) ne s'étendent pas jusqu'à l'extrémité supérieure du tube extérieur (1 ), pour empêcher la vis (3) de s'échapper accidentellement du tube extérieur (1 ).3. Forestay according to claim 2, characterized in that said grooves (19a, 19b) do not extend to the upper end of the outer tube (1), to prevent the screw (3) from escaping accidentally of the outer tube (1).
4. Etai selon la revendication 2, caractérisé en ce que lesdites gorges (19a, 19b) s'étendent jusqu'à l'extrémité inférieure du tube extérieur (1 ) pour permettre le démontage de la vis (3).4. Forestay according to claim 2, characterized in that said grooves (19a, 19b) extend to the lower end of the outer tube (1) to allow disassembly of the screw (3).
5. Etai selon la revendication 2, caractérisé en ce que lesdites saillies sont des protubérances (20a, 20b) extérieures de la partie inférieure de la vis (3). 5. Forestay according to claim 2, characterized in that said projections are protuberances (20a, 20b) outside the lower part of the screw (3).
6. Etai selon la revendication 2, caractérisé en ce que les gorges (19a, 19b) sont des déformations mécaniques locales du tube extérieur (1 ).6. Forestay according to claim 2, characterized in that the grooves (19a, 19b) are local mechanical deformations of the outer tube (1).
7. Etai selon la revendication 2, caractérisé en ce que lesdites saillies (20a, 20b) sont des déformations mécaniques locales de la partie inférieure non filetée de la vis (3),7. Forestay according to claim 2, characterized in that said projections (20a, 20b) are local mechanical deformations of the non-threaded lower part of the screw (3),
8. Etai selon la revendication 2, caractérisé en ce que lesdites saillies sont agencées de façon démontable sur la vis (3). 8. Forestay according to claim 2, characterized in that said projections are arranged in a removable manner on the screw (3).
PCT/IB1998/000727 1997-05-16 1998-05-14 Stay WO1998051886A1 (en)

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CH1152/97 1997-05-16

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Publication number Priority date Publication date Assignee Title
WO2017162415A1 (en) * 2016-03-22 2017-09-28 Peri Gmbh Frame element with a support head, and building scaffold comprising such a frame element
EP3670787A1 (en) * 2018-12-20 2020-06-24 David Saar Handelsgesellschaft UG (haftungsbeschränkt) Support device and method for mounting the same
GB2572850B (en) * 2018-02-22 2022-12-14 Vis Llc Under hoist support stand

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FR2450324A1 (en) * 1979-02-27 1980-09-26 Cinotto Simon Telescopic metal raking shore for stabilising vertical panels - has safety catches at each fixing end engaging respective rings in panel and ground
FR2451981A1 (en) * 1979-03-20 1980-10-17 Rennepont Adjustable length prop for concrete shutter support - has body sliding in tube for transport with locking pin engaging apertures
EP0349485A1 (en) 1988-06-28 1990-01-03 Etablissement Nanicoba Strut
BE1005249A3 (en) * 1991-01-28 1993-06-08 Cometal Nv Shore
EP0553666A1 (en) * 1992-01-25 1993-08-04 Peri Gmbh Length adjustable support
EP0725196A1 (en) * 1995-02-02 1996-08-07 Peri Gmbh Telescoping shore

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Publication number Priority date Publication date Assignee Title
FR2222870A5 (en) * 1973-03-20 1974-10-18 Koehl Ets Dismantling screw props - a groove- stud arrangement to prevent sepn of parts
FR2450324A1 (en) * 1979-02-27 1980-09-26 Cinotto Simon Telescopic metal raking shore for stabilising vertical panels - has safety catches at each fixing end engaging respective rings in panel and ground
FR2451981A1 (en) * 1979-03-20 1980-10-17 Rennepont Adjustable length prop for concrete shutter support - has body sliding in tube for transport with locking pin engaging apertures
EP0349485A1 (en) 1988-06-28 1990-01-03 Etablissement Nanicoba Strut
US4966345A (en) 1988-06-28 1990-10-30 Etablissement Nanicoba Prop
BE1005249A3 (en) * 1991-01-28 1993-06-08 Cometal Nv Shore
EP0553666A1 (en) * 1992-01-25 1993-08-04 Peri Gmbh Length adjustable support
EP0725196A1 (en) * 1995-02-02 1996-08-07 Peri Gmbh Telescoping shore

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017162415A1 (en) * 2016-03-22 2017-09-28 Peri Gmbh Frame element with a support head, and building scaffold comprising such a frame element
AU2017236137B2 (en) * 2016-03-22 2022-06-02 Peri Se Frame element with a support head, and building scaffold comprising such a frame element
GB2572850B (en) * 2018-02-22 2022-12-14 Vis Llc Under hoist support stand
EP3670787A1 (en) * 2018-12-20 2020-06-24 David Saar Handelsgesellschaft UG (haftungsbeschränkt) Support device and method for mounting the same

Also Published As

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AU7226598A (en) 1998-12-08
CH691323A5 (en) 2001-06-29

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