FR2831910A1 - Removable shore head has flange for impeding fall consisting of plate drilled with central hole and provided with support hooks on plate sides - Google Patents

Abstract

The flange (1) is intended to impede the fall of a removable head of a shore (10) comprising a runner (9) and a sole plate (8) drilled with a hole (12). It consists of a plate (2) drilled with a central hole (3) and provided with two support hooks (4,5) which extend from two opposite sides (6,7) of the plate. The dimensions of the plate are the same as those of the sole plate fixed at the end of the shore runner.

Description

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----------------La présente invention est relative à une amélioration apportée aux ?'. têtes d'étai amovibles. Removable stay head

---------------- The present invention relates to an improvement made to? '. removable forestay heads.

The technical field of the invention is that of the manufacture of telescopic props there serving as temporary vertical supports for construction works, in particular props supporting the formwork of horizontal concrete slabs.

 Such struts have a first tube called a slide, which is slidably mounted inside a second tube, called a barrel, with an internal diameter slightly greater than the external diameter of the first tube; a nut generally makes it possible to adjust the length of the forestay; the upper end of the first tube is generally fitted with a plate called a sole which is welded to the end of the first tube; the sole can be fitted with projecting members serving to hold in place a beam resting on the sole, which is then called a fork.

 So that a forestay can be used with or without a fork, it is known to use a removable fork; such a fork or removable head essentially consists of a plate capable of resting on the upper sole of the forestay; the plate is integral with bars or beam guiding profiles which extend from a first side of the plate, as well as a section of tube-or foot-which extends from a second side of the opposite plate on the first side; the diameter of the foot is chosen so that the section can extend inside the slide and an orifice drilled in the upper slide sole.

 The document DE 197 26 102 describes a forestay fork, the beam positioning members of which consist of two parallel sections: an inverted L-shaped section and a section of triangular section; this fork comprises a tubular leg provided with a bulge ensuring a connection by clamping between the slide of the forestay and the tubular leg of the fork; a drawback of such a fork is that, when it is desired to use the forestay without the end fork

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zizi C'est pourquoi il est fréquent d'utiliser des fourches d'étai amovibles dont le pied coulisse avec jeu dans la coulisse d'étai ; ceci y permet d'engager sans outil le pied de fourche dans la coulisse lorsque l'on souhaite équiper l'étai d'une telle fourche, et permet a contrario de dégager sans outil le pied de fourche pour utiliser l'étai sans fourche ; cependant, un inconvénient important d'une telle fourche amovible résulte de ce que, lorsque l'étai muni de sa fourche est incliné, en particulier renversé, la fourche peut se désolidariser inopinément de l'étai, sous l'action de son propre poids ; il en résulte une chute de la fourche qui peut être à l'origine de blessures et d'accidents. upper, it is necessary to use a tool to release the fork leg out of the slide, which in particular causes a loss of time.

zizi This is why it is frequent to use removable forestay forks whose feet slide with play in the forestay slide; this allows the fork leg to be engaged without tools in the slide when it is desired to equip the forestay with such a fork, and on the other hand allows the fork leg to be released without tools in order to use the forestay without fork; however, an important drawback of such a removable fork results from the fact that, when the forestay provided with its fork is inclined, in particular overturned, the fork can unexpectedly disengage from the forestay, under the action of its own weight ; this results in a fall of the fork which can cause injuries and accidents.

 An object of the invention is to provide a removable head-or sole or fork or console which is improved and / or which overcomes, at least in part, the drawbacks of known prop heads.

 An objective of the invention is also to propose a method for modifying known removable prop heads to improve them, as well as a parachute - or safety accessory - for detachable prop head.

 According to a first aspect, the invention consists in proposing a part or parachute structure hereinafter called a bridle-which counteracts and generally prevents the fall of a removable forestay head comprising a foot sliding freely in the slide of the forestay , the latter comprising a plate or sole or pierced plate welded to the end of the slide and extending generally perpendicular to the axis of the slide.

 To this end, said flange (said parachute) comprises:

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 - a first bearing face on the upper face of the sole integrated into the forestay, which allows it to transmit to it the forces resulting from the load supported by the head of state, .... 7 - a second bearing face on the underside of the fork or removable sole, which is generally substantially parallel to the first bearing face, and is connected to the latter for the transmission of said forces, - an orifice through which may extend and slide with clearance at least part of the foot of the fork or removable sole, and - at least two support members on the underside of the sole integrated into the forestay, which preferably extend on both sides other of said orifice.

 According to another aspect of the invention, such a parachute flange is used to make a removable forestay head "unexpectedly captive", by engaging this flange around the foot of the forestay head thanks to said orifice, and causing an enlargement local free end (lower) of said foot which is sufficient to prevent the subsequent separation of the flange and the forestay head by sliding the flange along the foot.

 According to another aspect, the invention consists in proposing a removable forestay head comprising a foot extending from a face (lower) of the head, the foot being able to slide with play in the slide of the forestay as well that in an orifice pierced in a sole integrated into the slide; the forestay head further comprises means of connection with the sole integrated into the forestay by engagement and / or support against the underside thereof, and means allowing limited relative sliding of the foot relative to these means of connection with the integrated sole.

 Thanks to said means of connection by engagement against the underside of the sole integrated into the forestay, in particular thanks to said support members of said flange, the complete separation of the head

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t et de l'étai est empêchée ou contrariée lorsque l'étai est incliné, secoué ou renversé.

t and the forestay is prevented or upset when the forestay is tilted, shaken or overturned.

 Thanks to the limited displacement means of the foot and the strap-and / or the connection means with the sole integrated into the stay-it is possible to disengage the foot outside the slide while maintaining, on the one hand a connection between the foot and the flange thanks to the limited sliding means - in particular thanks to the enlarged end of the foot preventing the separation of the foot and the flange -, and on the other hand a connection between the forestay head and the sole integrated into the forestay via said flange and its support means on the underside of the sole; when the foot is out of the slide, it then becomes possible to disengage these support means to obtain complete separation of the head and the forestay.

 Preferably, said forestay head, and in particular said flange, has a groove whose width is adapted and greater than the thickness of at least one edge of the sole integrated into the forestay; one of the walls delimiting this groove can thus comprise or constitute said support members (of the flange) and / or said connecting means by engagement against the underside of the integrated sole; this groove serves as a guide facilitating the mutual engagement (respectively disengagement) of the forestay head and of the sole integrated into the forestay; more preferably, the forestay head and / or the parachute flange comprises two such grooves which are parallel and whose openings face each other; this further facilitates guidance for the engagement (and disengagement) movements of the head with the integrated sole.

 It is particularly advantageous that the forestay head comprises - and that the flange consists essentially of - a square or rectangular plate comprising said support means - in particular said grooves - along two of its opposite edges; this makes it possible to obtain a simple and inexpensive structure which ensures good transmission of the forces between the forestay and the load (beam) supported by the forestay; according to a preferred embodiment, the flange is thus essentially

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 consisting of a section of metal profile, which can in particular be obtained by bending sheet steel, the cross section and / or profile of which takes the shape of a C, and which is pierced with said passage orifice of the foot.

 Although the foot of the forestay head can be mounted mobile - in particular sliding - relative to the structure of the head (fork or sole) used to support a beam or other part of the work, it is preferably linked rigidly, in particular welded, to this structure.

 The foot generally has a substantially cylindrical external surface; although it can be full and of section of various shapes (square or oval in particular), it is preferably hollow and of circular section.

 According to another preferred characteristic of the invention, the flange is mounted to rotate freely relative to the foot of the removable head and is provided with angular locking-or indexing means, in a determined relative angular position of the foot and the flange. , allowing, in this position, the sliding of the flange substantially to the free end of the foot, and limiting the amplitude of this sliding in the other angular positions; these means are preferably provided in the form, on the one hand of at least one notch made in the flange and opening into the orifice for the passage of the foot, and on the other hand of at least one lug or projecting part with the external surface of the foot, in the vicinity of the enlarged portion of the foot, of shape complementary to that of the notch so as to be able to be housed therein, in said determined relative angular position.

 This further increases the safety of handling of the removable head by prohibiting the maximum extraction of the foot out of the slide when the strap is engaged with the prop of the forestay, as long as the removable head is not turned so that that said determined relative angular position is reached, in order to allow the complete retraction of the foot out of the slide.

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 This also allows, when the foot extends inside the slide, a free rotation of the removable head relative to the forestay, which facilitates the use of the forestay and its free orientation relative to the work to be supported.

 Other advantages and characteristics of the invention appear in the following description which refers to the accompanying drawings, and which illustrates without any limiting character of the preferred embodiments of the invention.

 Figures 1 and 2 illustrate in perspective two embodiments of a flange according to the invention and the manner in which they can fit together with a sole fixed to the upper end of a forestay slide, by sliding on this sole.

 Figure 3 is a cross-sectional view through a vertical plane containing the axis of a slide, the upper end thereof and the sole which it is provided, as well as a removable forestay head (partially shown) according to the invention, which comprises a foot welded to the head and a sliding flange similar in shape to that illustrated in FIG. 2.

 Figure 4 is a cross-sectional view through a vertical plane containing the axis of a forestay slide and the axis of a foot of a removable head according to the invention, in a position of total disengagement of the foot outside the slide, and partial engagement of a flange with the sole integrated into the slide; the plane of Figure 4 is parallel to the axis of sliding of the flange on the sole, while the plane of Figure 3 is orthogonal to this axis.

 FIG. 5 is a partial perspective view (with cutaway) of another embodiment of a forestay head according to the invention and of a forestay slide end in which the mobile forestay head foot is partially engaged.

 Figures 6 to 13 schematically illustrate 8 alternative embodiments of a projecting stop on the outer surface of the foot of a

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 forestay head, at the lower end of the foot, used to prevent the separation of a foot and a flange.

cylindrique ; les figures 15 et 16 sont respectivement des vues selon XV il et selon XVI-XVI de la figure 14, cette dernière étant une vue de côté. Figures 14 to 16 illustrate a variant, embodiment of a forestay head according to the invention in which the foot does not have a shape

cylindrical; Figures 15 and 16 are respectively views along XV il and XVI-XVI of Figure 14, the latter being a side view.

 FIG. 17 illustrates another variant embodiment of the invention.

 Figures 18 and 19 illustrate another preferred embodiment of a removable fork according to the invention; FIG. 18 is a side view similar to FIG. 14, and FIG. 19 is a view along XIX-XIX of FIG. 18.

 With reference to FIG. 1, the flange 1 according to the invention essentially consists of a plate 2 pierced with a central orifice 3 and provided with two hooks 4 and 5 extending from two opposite edges 6 and 7 of the plate 1.

 The shape and dimensions of the plate 2 are adapted, in particular identical, to those of the sole 8 fixed to the end of the slide 9 of the forestay 10.

 The rectangular sole 8 extends perpendicular to the longitudinal axis 11 of the slide 9, and is pierced with a circular central orifice 12; the diameter 13 of this orifice and the internal diameter 14 of the slide 9, the values of which are equal or similar, are usually greater than the external diameter 15 of the foot 16 of the head 17 of the removable forestay (FIG. 3), so that the foot can be introduced into the orifice 12 and the slide 9, and can slide in the latter with a diametral clearance of the order of approximately 1 to 3 mm.

 In the preferred embodiment illustrated in Figures 2 and 3 in particular, the flange consists of a plate 2 pierced, square, extended along two of its parallel edges of two elements 18

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figure 1. ""J" 'J. to 21 of flat wall, orthogonal, and provided on a third edge 22 with a stop 23, the hook shape of which is similar to those 4.5 of the

figure 1. "" J "'J.

The walls 18, 19 on the one hand and 20, 21 on the other hand form, with the flat plate 2, two parallel grooves 24 and 25 facing each other (Figures 2 and 3 in particular).

 The width 26 of each groove 24.25 is greater than the thickness 27 of the two opposite edges 28.29 of the sole 8, so that the flange 1 can be engaged on the sole 8, the grooves 24.25 sliding along edges 28, 29 of the sole, in a translational movement 30 parallel to these edges (see FIGS. 1, 2, 4).

 As illustrated in FIGS. 3 to 13 in particular, the foot 16 has an elongated shape generally cylindrical along an axis 31, between an upper end 32 by which - except in the case of FIG. 5 - the foot is fixed to the sole 33 of the head 17 removable, and a lower end 34 "free".

 This lower end is widened by the presence of at least one protruding part relative to the external surface of the central part of the foot.

 This widening may result from the presence of a ring 35 (Figure 6) surrounding the end, a washer 36 (Figure 7) attached to this end, a stud or bolt 37 (Figure 5 and 8) s' extending through orifices drilled at this end, with one or more hemispherical projection (s) 38 (FIG. 9) crimped at this end, with a section of flat bar 39 (FIG. 11) or a plug 40 (Figure 13) attached to this end, or projecting welding points 41 (Figure 12).

 In the case in particular where a known removable head comprising a tubular base is modified in accordance with the invention, this enlargement may comprise-or be constituted by-a flare 42

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Le diamètre 44 (figure 3) de l'orifice 3 percé dans la plaque 2 de la bride 1 est choisi à une valeur intermédiaire entre le diamètre 15 de la partie centrale du pied 16 et la plus grande dimension transversaleen particulier le diamètre 45-de l'extrémité élargie-en particulier évasée-du pied ; la bride 1 peut ainsi coulisser avec jeu le long du pied, entre l'extrémité supérieure du pied et son extrémité inférieure élargie 34 formant une butée en translation, sans que cette dernière extrémité ne puisse traverser cet orifice, ce qui interdit donc une désolidarisation complète du pied et de la bride. of the bottom end wall 43 of the base 34, as illustrated in FIGS. 3, 10 and 18.

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The diameter 44 (FIG. 3) of the orifice 3 drilled in the plate 2 of the flange 1 is chosen at an intermediate value between the diameter 15 of the central part of the foot 16 and the largest transverse dimension, in particular the diameter 45-of the enlarged, particularly flared, end of the foot; the flange 1 can thus slide with play along the foot, between the upper end of the foot and its enlarged lower end 34 forming a stop in translation, without the latter end being able to pass through this orifice, which therefore prohibits complete detachment foot and flange.

 In the relative position of the head 17 relative to the forestay slide 9 which is illustrated in FIG. 3, the head is as far as possible from the slide; the flared portion of the wall 43 of the foot 16 is in contact with the underside 46 of the plate 2, at the periphery of the orifice 3 provided therein; an upward force (along axes 11 and 31) of lifting the head 17 has the effect of lifting the flange 1 suspended at the lower end of the foot 16, to the position illustrated in FIG. 3 where the respective faces 47, 48 walls 19 and 21 bear against the underside 49 of the sole 8, along the edges 28, 29 of the latter; the separation of the head and the forestay along these axes 11, 31 is thus prohibited.

 This separation can only occur by simultaneous sliding of the head 17 and the flange 1 relative to the sole 8, in a direction 30 (Figures 1 and 4) parallel to the grooves 24.25; this sliding is possible provided that the lower end 34 is completely disengaged from the orifice 12 of the sole 8; for this purpose, the thickness 50 of the foot portion projecting from the surface 46 must be less than the clearance 51 resulting from the difference between the width 26 of the grooves of the flange, and the thickness 27 of the sole .

 In the embodiments illustrated in FIGS. 2 and 5 in particular, two projecting members 37 at the bottom of the foot can be

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déterminée de la bride et du pied ; ceci empêche, dans les positions angulaires autres que celle-ci, l'escamotage maximal du pied hors de la coulisse d'étai, et interdit par conséquent la désoiidarisation complète de la tête amovible et de l'étai.'
Dans le mode de réalisation de la figure 1, l'appui de la bride contre la face inférieure de la semelle est obtenu par les extrémités 53 des crochets latéraux 4 et 5. received in two notches 52 opening into the orifice 3 and diametrically opposite, in a relative angular position

determined flange and foot; this prevents, in angular positions other than this, the maximum retraction of the foot out of the forestay slide, and consequently prohibits the complete removal of the detachable head and the forestay. '
In the embodiment of FIG. 1, the support of the flange against the underside of the sole is obtained by the ends 53 of the lateral hooks 4 and 5.

 In the embodiment of Figure 5, the foot 16 is sliding relative to the plate 33 of the head 17; sections 54 of profiles extending from the upper face of this plate 33, and serve as lateral stops for beams (not shown) placed on the plate 33; the flange 1 is rigidly secured (by welding) to the plate 33; a circular orifice provided with two notches is provided in this plate to allow sliding along the axis 31 of the foot 16, and to allow its upper end 32 to be retracted into the plate 33, when the lugs 55 provided at its part upper 32 are placed opposite these notches.

 In the embodiment of Figures 14 to 16, the angular indexing of the foot 16a, 16b relative to the flange 1 is obtained by the ovalized lower part 16a of the foot, obtained for example by its crushing.

 In order to facilitate the handling of the removable head, sensitive, in particular visual, in particular colored, marks can be provided on the flange and / or on the leg or the fork.

 In the embodiment of Figure 17, the beam guide stops 44 are rigidly secured to the walls 18 and 20 of the flange, the foot 16 being secured to the plate 33 and mounted to slide and rotate in the hole drilled in the flange plate 2; in addition, a member 56 protrudes from the wall 21 of the flange extending towards

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the free end of the foot; therefore, if inadvertently the head was placed on a sole (such as 8 figure 1) forestay without the grooves of the flange being engaged with the edges thereof, it would result in a relative inclination of the head in relation to the sole, showing a faulty assembly.

,.

Preferably, as illustrated in FIG. 18, the ratio of the length 69 of the foot 16 to its diameter is chosen to be less than 3, in particular less than 2, in particular close to 1, which makes it possible to lighten the head; this also makes it easy to check that the flange of the removable head is correctly engaged, by its grooves, with the edges of the sole of the forestay slide; if this is not the case, in particular when the fork is placed on this sole, resting on the lower lugs 19, 21 of the flange 1 on the upper face 60 of the sole 8, it follows that the lower part 34 of leg 16 is barely (or not at all) engaged in the slide and that the fork is unstable and can tilt and fall under the effect of a slight lateral thrust. This control is further facilitated when one of the lower pleats 19 or 21 is bent downward to form a wedge or projection 56 illustrated in FIGS. 17 to 19.

 In the preferred embodiment illustrated in FIGS. 18 and 19, the lower end 34 of the foot is flared and further comprises an angular polarization 37 constituted by one end of a pin 61 extending diametrically inside the tubular foot; this end 37 is protruding on the external face of the foot, near and above the flared part, and can be housed in a notch 52 provided in the orifice 3 of the plate 2 of the flange 1, when the foot is correctly oriented relative to the flange; this allows, as explained above, to authorize, in this relative angular position of the foot and the flange, the total or almost total retraction of the lower end of the foot into the orifice 3 of passage provided in the flange, and therefore allows the engagement (or disengagement) of the flange and the forestay sole.

Claims (10)

 CLAIMS 1. Piece (1) intended to counteract the fall of a removable head (17) of a forestay (10) comprising a slide (9) and a sole (8) pierced with an orifice (12), said head comprising a foot (16) capable of sliding with play in the slide and in the orifice, characterized in that it comprises: - a face (46) bearing on the upper face (60) of the sole, - a face (61) bearing on the lower face (62) of the removable head, - an orifice (3) through which can extend and slide with play, at least part of the foot, and - two members ( 4,5, 19,21, 23) bearing on the underside (49) of the sole.  2. A method of modifying a removable head (17) of forestay (10) comprising a foot (16), characterized in that a part according to claim 1 is engaged around the foot, then an enlargement of the 'lower end (34) of the foot.  3. Removable head (17) of a forestay (10) comprising a slide (9) and a sole (8) pierced with an orifice (12), the head comprising a foot (16) capable of sliding with play in the slide and in the orifice, characterized in that it comprises means (4,5, 19,21, 23,47, 48,53) for pressing against the underside (49) of the sole, as well as means (3.35 to 43) allowing limited movement of the foot relative to said support means.  4. Head according to claim 3 which comprises a hook (4,5, 23) comprising said support means (53).  5. Head according to claim 3 or 4 which comprises a groove (24,25) whose width (26) is greater than the thickness (27) of the edges (28,29) of the sole. <Desc / Clms Page number 13>  6. Removable forestay head comprising a part according to claim 1.  7. Head according to any one of claims 3 to 6 comprising a part (1) mounted to slide and rotate around the foot, which part or flange comprises a plate (2) and two parallel grooves (24, 25) facing each other.  8. Head according to any one of claims 3 to 7 which comprises a part (1) mounted to slide and rotate relative to the foot and which essentially consists of a section of metal profile of profile in the general shape of C.  9. Head according to any one of claims 3 to 8 which comprises a part (1) mounted to slide and rotate relative to the foot and which comprises means (37,52) for relative angular indexing of the foot and the flange.  10. Head according to any one of claims 3 to 9 in which the ratio of the length of the foot to its diameter (15) is less than 3, in particular less than 2, the lower end (34) of the foot having a enlargement.