WO2005042879A1 - Stanchion - Google Patents

Stanchion Download PDF

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Publication number
WO2005042879A1
WO2005042879A1 PCT/ES2004/000469 ES2004000469W WO2005042879A1 WO 2005042879 A1 WO2005042879 A1 WO 2005042879A1 ES 2004000469 W ES2004000469 W ES 2004000469W WO 2005042879 A1 WO2005042879 A1 WO 2005042879A1
Authority
WO
WIPO (PCT)
Prior art keywords
inner tube
tube
stop block
strut
hole
Prior art date
Application number
PCT/ES2004/000469
Other languages
Spanish (es)
French (fr)
Inventor
Pedro Xammar Bove
Original Assignee
Encofrados J.Alsina, S.A.
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 Encofrados J.Alsina, S.A. filed Critical Encofrados J.Alsina, S.A.
Priority to US10/577,851 priority Critical patent/US20070164184A1/en
Priority to EP04791388A priority patent/EP1693534A1/en
Publication of WO2005042879A1 publication Critical patent/WO2005042879A1/en

Links

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
    • E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
    • E04G17/04—Connecting or fastening means for metallic forming or stiffening elements, e.g. for connecting metallic elements to non-metallic elements
    • 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

Definitions

  • the invention relates to a strut, particularly applicable to formwork, extensible by extracting an inner tube arranged coaxially in an essentially vertical outer base tube.
  • the struts are height-adjustable vertical supports, commonly used in construction, consisting of a vertical outer base tube, provided at its lower end with a support foot, and an inner tube, which is more or less removable of the base tube adapting the length of the strut to the distance between the surfaces or elements to be supported by the strut.
  • the inner tube is also provided at its outer end with a support, configured as a horizontal platform, so that the weight to be supported by the strut is distributed over a larger surface.
  • the struts are provided with fixing means that allow to fix the position of the inner tube once enough has been removed from the base tube.
  • fixing means When the fixing means are not operative, the inner tube slides freely inside the base tube. In such circumstances, total extraction of the inner tube is possible.
  • struts are provided with safety devices, which prevent the complete extraction of the inner tube from the inside of the base tube.
  • inventions also include inner stops, integral to the inner tube, intended to run into projections of different shapes or dimensions arranged, also integral, in the base tube.
  • the known safety devices although they do not allow the total extraction of the inner tube but the disassembly of the latter is not easy. In addition, they do not allow both tubes to remain attached when the inner tube is completely removed from the inside of the base tube, which would avoid risk situations but allow access to the lower end of the inner tube. It is therefore noted the lack of a strut with safety device, which allows easy separation of both tubes when necessary, and access to the lower end of the inner tube, with complete removal of the inner tube, without a complete separation between both tubes, guaranteeing safety and avoiding unwanted accidental separation.
  • the strut of the invention is extensible, by extracting an inner tube coaxially arranged in an outer base tube, and comprises means for fixing the position of said inner tube with respect to the outer base tube, as well as a device safety that prevents the total separation of both tubes when the fixing means are inoperative.
  • the strut is characterized in that the safety device comprises means of connection between both tubes, which prevent their separation but allow the displacement of the inner end of the inner tube between two fixed points, of which the first point is arranged in the inside of outer base tube, while the second point is determined by the length of said link means.
  • the link means are constituted by a thin and elongated connecting element, such as a rod, a cable or the like, longitudinally arranged inside the outer base tube, the first end of the joining element being removably fixed at one end of said outer tube while the opposite end, introduced into the inner tube, is provided with a stop block that prevents its removal from the inner tube when it bumps against a retaining element integral with the inner end of the inner tube, preventing the exit of the stop block inside the inner tube.
  • the retaining element is formed by a cover, which is provided with a through hole, whose diameter is smaller than that of the stop block, whereby it allows passage through the connecting element but prevents the passage of the stop block.
  • the inner tube is provided with a second through hole on one side, adjacent to the hole of the lid, preferably of a section equal to that of the stop block and communicated with said hole of the lid through a slot, of width substantially greater than that of the connecting element.
  • Fig. 1 is an elevational and sectional view of the strut object of the invention in normal position
  • Fig. 2 is an elevational and sectional view of the strut object of the invention in an inverted and extended position
  • Fig. 3 is a detail view of the lower end of the inner tube of the strut
  • Fig. 4 is a detailed view of the connecting element of both tubes and the stop block arranged at one of its ends
  • Fig. 5 is a detailed view of the lower end of the base tube and of the removable fixing of the end of the rod to said base tube
  • Fig. 6, is a detailed view of the lower end of a base tube, in an inverted position, and of the removable fixing of the end of the rod to said base tube according to another embodiment.
  • Strut 1 of Figs. 1 and 2 is formed by two tubes, a first outer base tube 3 and a second inner tube 2, slidable inside the base tube 3 so that it can be extracted in greater or lesser measure according to the length that is wish for the prop.
  • the fixing means of both tubes 2 and 3 have not been shown, which allow them to be fixed once the strut 1 has been provided with the desired length for use.
  • Fig. 1 which represents the strut 1 in non-extended position, shows that inside the base tube 3 are arranged the linking means 12, constituted by a rod that acts as a link between the two tubes 2 and 3.
  • the rod 12 is removably coupled to the lower end 17 of the base tube 3.
  • the rod 12 is provided at its end with a clamping ring 13, which is crossed by a pin 14 that crosses the base tube 3, and which is attached to it by screws 15 or any other known method.
  • a clamping ring 13 which is crossed by a pin 14 that crosses the base tube 3, and which is attached to it by screws 15 or any other known method.
  • the inventor has provided other types of fixing the end of the rod 12 to the lower end 17 of the base tube 3. An example of such systems is shown in Fig.
  • the rod 12 is provided at its attachable end with a widening 20 and that the lower end of the base tube 3 is provided with a lower support 19, in turn provided with a raised central portion 24 provided with a through hole 22, through which it introduces the end of the rod 12 to the said widening zone 20, which blocks the passage of the rod 12 through the through hole 22.
  • This raised central portion 24 of the lower support 19 may be configured to receive, in the case that the strut is used in an inverted position to the usual one, a pivot of which usually protrude down the structure on which the formwork boards of a higher level rest. In said circumstances, the formwork would be supported, through said structure, on the lower support 19, which would act as the upper support.
  • a lower support 19 is shown in a non-representative scale, which, due to the inverted use of the strut, performs the functions of upper support.
  • the raised central portion 24 of said support is configured in the form of a deep recess to be able to receive the fit of a pivot 25 provided for this purpose in the support structure of a formwork board of an upper floor.
  • the end 23 of the rod 12 protruding from the passing hole 22 is provided with an external thread in which a nut 21 or the like is screwed, thereby fixing the rod 12 to the base tube.
  • the rod 12 is arranged longitudinally inside the strut 1 and passes through the cover 8 of the lower end 7 of the inner tube 2 through the through hole 9 (Fig. 4).
  • the rod 12 is provided with a stop block 6, which, as indicated in Fig. 1, is arranged inside the inner tube 2. If the strut 1 is inverted with respect to its normal working position, the tube 2 can slide inside the base tube 3, in the direction indicated by arrow 16 of Fig.
  • Figs. 3 and 4 show in detail the end of the rod 12, provided with a stop block 6, and the lower end 7 of the inner tube 2, respectively.
  • the inner tube 2 is provided with a second through hole 10, of equal contour to that of the stop block 6, through which said stop 6 can be inserted inside the inner tube 2.
  • the second through hole 10 is connected to the through hole 9 of the cover 8 through a slot 11, which allows the inner tube and the rod 12 to be arranged in line once the stop block 6 is inserted in the inner tube 2 through the through hole 10, so that the inner tube can be introduced into the base tube.
  • the same operation, but vice versa, should be carried out in the case of wanting to separate the rod 12 from the inner tube 2 and remove the stop block 6 from the inside of the inner tube 2.
  • the stop block 6 can be provided with a polygonal contour section, coincident with the contour of the second through hole 10 on the side of the inner tube, so that the stop block 6 could only be removed from the inner tube 2 through the hole 10, the rod 12 being arranged perpendicularly with respect to the inner tube 2, which is practically impossible to happen casually or by accident.
  • the length of the stop block 6 is greater than the diameter of the hole 10.
  • the tube 2 At the time of mounting the strut 1, and to facilitate the introduction of the rod 12 through one end of the tube 2 and through the hole intern 9 of opposite end, it is envisaged to provide the tube 2, in the area near the through hole 9, with a gradual narrowing in the outward direction of its inner section, as a neck or funnel, so that the lower end of the rod 12 it is directed towards the through hole 9.
  • Such funnel configuration can also be made in the base tube 3, near the through hole 22, if it exists.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
  • Supports For Pipes And Cables (AREA)

Abstract

The invention relates to a stanchion. The inventive stanchion can be extended with the extraction of an inner tube which is disposed coaxially inside an outer base tube. Moreover, the invention is equipped with a safety device which prevents the aforementioned tubes from being separated fully from one another and which comprises tube connection means. According to the invention, the connection means prevent the separation of the tubes, while enabling the lower end of the inner tube to move between two fixed points, namely: a first point which is disposed inside the base tube and a second point which is determined by the length of the connection means. The connection means comprise a long, thin linking element, such as a rod, cable or similar, which is disposed longitudinally inside the base tube, such that one end thereof is fixed to the base tube and the opposing end is inserted into the inner tube, said opposing end being equipped with a stop block which prevents the extraction thereof from the inner tube.

Description

D E S C R I P C I Ó N D E S C R I P C I Ó N
"Puntal" Sector técnico de la invención La invención se refiere a un puntal, particularmente aplicable a encofrados, extensible mediante la extracción de un tubo interior dispuesto coaxial en un tubo base exterior esencialmente vertical. Antecedentes de la invención Los puntales son soportes verticales regulables en altura, utilizados habitualmente en la construcción, constituidos por un tubo base exterior vertical, provisto en su extremo inferior de un pie de apoyo, y de un tubo interior, que es extraíble más o menos del tubo base adaptando la longitud del puntal a la distancia entre las superficies o elementos a soportar por el puntal. Por lo general, el tubo interior está dotado también en su extremo exterior de un apoyo, configurado a modo de plataforma horizontal, para que el peso a soportar por el puntal se reparta sobre una superficie mayor. Los puntales están provistos de unos medios de fijación que permiten fi- jar la posición del tubo interior una vez se ha extraído lo suficiente del tubo base. Cuando los medios de fijación no están operativos, el tubo interior desliza libremente por dentro del tubo base. En tales circunstancias, es posible la extracción total del tubo interior. En ocasiones, y particularmente cuando se manipula el puntal y se in- vierte o inclina, respecto de su posición de trabajo normal, se puede producir la extracción completa de un modo casual o accidental del tubo interior, lo que puede ocasionar graves accidentes de trabajo. Para evitar estas situaciones, se conocen puntales provistos de dispositivos de seguridad, que impiden la extracción completa del tubo interior del interior del tubo base. Un ejemplo de realización está descrito en el documento ES 1031628 que hace referencia a un puntal con dispositivo imperdible del tubo interior, el cual incorpora en una zona próxima a su extremo inferior dos orificios, diame- tralmente opuestos, en los cuales se aloja una lengüeta, dispuesta transver- salmente al tubo interior y de longitud ligeramente mayor al diámetro del tubo interior, de forma que sus extremos sobresalen por los citados orificios pero sin llegar a contactar con la pared interna del tubo exterior, habiéndose previsto la existencia de una arandela dispuesta externamente al tubo interior y con posi- bilidad de movimiento libre respecto del tubo en el interior de la tuerca de accionamiento, (que es la que en su movimiento, ascendente o descendente, arrastra el tubo interior para conseguir variar la longitud final del puntal), contando la citada arandela con un diámetro interior menor a la longitud de la lengüeta. Otras realizaciones también comprenden topes interiores, solidarios del tubo interior, destinados a topar con salientes de diferentes formas o dimensiones dispuestos, también solidarios, en el tubo base. Los dispositivos de seguridad conocidos si bien no permiten la extracción total del tubo interior pero el desmontaje de éste último no resulta fácil. Además, tampoco permiten que ambos tubos permanezcan unidos cuando el tubo interior está totalmente extraído del interior del tubo base, lo que evitaría las situaciones de riesgo pero permitiría acceder al extremo inferior del tubo interior. Se hace notar pues la falta de un puntal con dispositivo de seguridad, que permita la fácil separación de ambos tubos cuando sea necesario, y el acceso al extremo inferior del tubo interior, con la extracción completa del tubo interior, sin que exista una separación completa entre ambos tubos, garantizando la seguridad y evitando una separación accidental no deseada. Explicación de la invención El puntal de la invención es extensible, mediante la extracción de un tubo interior dispuesto coaxial en un tubo base exterior, y comprende unos medios de fijación de la posición de dicho tubo interior respecto del tubo exterior base, así como un dispositivo de seguridad que impide la separación total de ambos tubos cuando los medios de fijación están inoperativos. En esencia, el puntal se caracteriza porque el dispositivo de seguridad comprende unos medios de enlace entre ambos tubos, que impiden su separación pero permiten el desplazamiento del extremo interior del tubo interior entre dos puntos fijos, de los que el primer punto está dispuesto en el interior del tubo base exterior, en tanto que el segundo punto viene determinado por la longitud de dichos medios de enlace. Según una realización preferida, los medios de enlace están constituidos por un elemento de unión delgado y alargado, tal como una varilla, un ca- ble o similar, longitudinalmente dispuesto en el interior del tubo base exterior, estando el primer extremo del elemento de unión fijado amoviblemente en un extremo del citado tubo exterior mientras que el extremo contrario, introducido en el tubo interior, está provisto de un bloque de tope que impide su extracción del tubo interior al topar contra un elemento retenedor solidario del extremo interior del tubo interior, impidiendo la salida del bloque de tope del interior del tubo interno. Según otra característica de la invención, el elemento retenedor está formado por una tapa, la cual está provista de un orificio pasante, cuyo diámetro es menor que la del bloque de tope, por lo que permite el paso a su través del elemento de unión pero impide el paso del bloque de tope. Según otro aspecto de la invención, el tubo interior está provisto de un segundo orificio pasante en un lateral, adyacente al orificio de la tapa, preferentemente de sección igual a la del bloque de tope y comunicado con dicho orificio de la tapa mediante una ranura, de anchura sensiblemente superior a la del elemento de unión."Strut" Technical Sector of the Invention The invention relates to a strut, particularly applicable to formwork, extensible by extracting an inner tube arranged coaxially in an essentially vertical outer base tube. BACKGROUND OF THE INVENTION The struts are height-adjustable vertical supports, commonly used in construction, consisting of a vertical outer base tube, provided at its lower end with a support foot, and an inner tube, which is more or less removable of the base tube adapting the length of the strut to the distance between the surfaces or elements to be supported by the strut. In general, the inner tube is also provided at its outer end with a support, configured as a horizontal platform, so that the weight to be supported by the strut is distributed over a larger surface. The struts are provided with fixing means that allow to fix the position of the inner tube once enough has been removed from the base tube. When the fixing means are not operative, the inner tube slides freely inside the base tube. In such circumstances, total extraction of the inner tube is possible. Occasionally, and particularly when the strut is manipulated and inverted or tilted, with respect to its normal working position, complete or accidental removal of the inner tube may occur, which can result in serious work accidents. . To avoid these situations, struts are provided with safety devices, which prevent the complete extraction of the inner tube from the inside of the base tube. An exemplary embodiment is described in document ES 1031628 which refers to a strut with a captive device of the inner tube, which incorporates two diametrically opposite holes in its area near its lower end, in which a tongue is housed , willing to cross exit to the inner tube and of a length slightly greater than the diameter of the inner tube, so that its ends protrude through the aforementioned holes but without contacting the inner wall of the outer tube, the existence of a washer arranged externally to the inner tube being provided and with the possibility of free movement with respect to the tube inside the drive nut, (which is the one that in its movement, ascending or descending, drags the inner tube to be able to vary the final length of the strut), counting said washer with an inner diameter smaller than the length of the tongue. Other embodiments also include inner stops, integral to the inner tube, intended to run into projections of different shapes or dimensions arranged, also integral, in the base tube. The known safety devices although they do not allow the total extraction of the inner tube but the disassembly of the latter is not easy. In addition, they do not allow both tubes to remain attached when the inner tube is completely removed from the inside of the base tube, which would avoid risk situations but allow access to the lower end of the inner tube. It is therefore noted the lack of a strut with safety device, which allows easy separation of both tubes when necessary, and access to the lower end of the inner tube, with complete removal of the inner tube, without a complete separation between both tubes, guaranteeing safety and avoiding unwanted accidental separation. Explanation of the invention The strut of the invention is extensible, by extracting an inner tube coaxially arranged in an outer base tube, and comprises means for fixing the position of said inner tube with respect to the outer base tube, as well as a device safety that prevents the total separation of both tubes when the fixing means are inoperative. In essence, the strut is characterized in that the safety device comprises means of connection between both tubes, which prevent their separation but allow the displacement of the inner end of the inner tube between two fixed points, of which the first point is arranged in the inside of outer base tube, while the second point is determined by the length of said link means. According to a preferred embodiment, the link means are constituted by a thin and elongated connecting element, such as a rod, a cable or the like, longitudinally arranged inside the outer base tube, the first end of the joining element being removably fixed at one end of said outer tube while the opposite end, introduced into the inner tube, is provided with a stop block that prevents its removal from the inner tube when it bumps against a retaining element integral with the inner end of the inner tube, preventing the exit of the stop block inside the inner tube. According to another characteristic of the invention, the retaining element is formed by a cover, which is provided with a through hole, whose diameter is smaller than that of the stop block, whereby it allows passage through the connecting element but prevents the passage of the stop block. According to another aspect of the invention, the inner tube is provided with a second through hole on one side, adjacent to the hole of the lid, preferably of a section equal to that of the stop block and communicated with said hole of the lid through a slot, of width substantially greater than that of the connecting element.
Breve descripción de los dibujos En los dibujos adjuntos se ilustra, a título de ejemplo no limitativo, un modo de realización preferido del puntal objeto de la invención. En dichos dibu- jos: La Fig. 1 , es una vista en alzado y en sección del puntal objeto de la invención en posición normal; la Fig. 2, es una vista en alzado y en sección del puntal objeto de la invención en posición invertida y extendido; la Fig. 3, es una vista en detalle del extremo inferior del tubo interior del puntal ; la Fig. 4, es una vista en detalle del elemento de unión de ambos tubos y del bloque de tope dispuesto en uno de sus extremos; la Fig.5, es una vista en detalle del extremo más inferior del tubo base y de la fijación amovible del extremo de la varilla al citado tubo base; y la Fig. 6, es una vista en detalle del extremo más inferior de un tubo base, en posición invertida, y de la fijación amovible del extremo de la varilla al citado tubo base según otro modo de realización.BRIEF DESCRIPTION OF THE DRAWINGS The attached drawings illustrate, by way of non-limiting example, a preferred embodiment of the strut object of the invention. In said drawings: Fig. 1 is an elevational and sectional view of the strut object of the invention in normal position; Fig. 2 is an elevational and sectional view of the strut object of the invention in an inverted and extended position; Fig. 3 is a detail view of the lower end of the inner tube of the strut; Fig. 4, is a detailed view of the connecting element of both tubes and the stop block arranged at one of its ends; Fig. 5, is a detailed view of the lower end of the base tube and of the removable fixing of the end of the rod to said base tube; and Fig. 6, is a detailed view of the lower end of a base tube, in an inverted position, and of the removable fixing of the end of the rod to said base tube according to another embodiment.
Descripción detallada de los dibujos El puntal 1 de las Figs. 1 y 2 está formado por dos tubos, un primer tubo base exterior 3 y un segundo tubo interior 2, deslizable por el interior del tubo base 3 de manera que puede ser extraído del mismo en mayor o menor medi- da según la longitud que se desee para el puntal. En la dichas figuras no se han representado los medios de fijación de ambos tubos 2 y 3, los cuales permiten fijarlos una vez se ha dotado al puntal 1 de la longitud deseada para su utilización. La Fig. 1, que representa el puntal 1 en posición no extendida, muestra que en el interior del tubo base 3 están dispuestos los medios de enlace 12, constituidos por una varilla que hace las funciones de enlace entre los dos tubos 2 y 3. La varilla 12 está acoplada amoviblemente al extremo 17 más inferior del tubo base 3. A tal efecto, la varilla 12 está provista en su extremo de una anilla de sujeción 13, la cual está atravesada por un pasador 14 que atra- viesa el tubo base 3, y que está sujeto a éste mediante tornillos 15 o cualquier otro método conocido. Alternativamente al sistema representado en las Figs. 1 y 2, el inventor ha previsto otros tipos de fijación del extremo de la varilla 12 al extremo más inferior 17 del tubo base 3. Un ejemplo de dichos sistemas se representa en la Fig. 5, en la que se puede apreciar que la varilla 12 está dotada en su extremo acoplable de un ensanchamiento 20 y que el extremo inferior del tubo base 3 está provisto de un soporte inferior 19, dotado a su vez de una porción central elevada 24 provista de un orificio pasante 22, a través del cual se introduce el extremo de la varilla 12 hasta la citada zona de ensanchamiento 20, que blo- quea el paso de la varilla 12 a través del orificio pasante 22. Esta porción central elevada 24 del soporte inferior 19 puede estar configurada para recibir, en el caso de que el puntal se utilice en una posición invertida a la habitual, un pivote de los que habitualmente sobresalen hacia abajo de la estructura sobre la que descansan los tableros del encofrado de un nivel superior. En dichas circunstancias, el encofrado se apoyaría, a través de dicha estructura, en el soporte inferior 19, el cual actuaría de soporte superior. A modo de ejemplo se ha representado en la Fig. 6, a una escala no representativa, un soporte inferior 19 que, debido a la utilización en posición invertida del puntal, hace las funciones de soporte superior. La porción central elevada 24 de dicho soporte está configurada en forma de oquedad profunda para poder recibir el encaje de un pivote 25 provisto a tal efecto en la estructura de soporte de un tablero de encofrado de un piso superior. En la Fig. 5, el extremo 23 de la varilla 12 que sobresale del orificio pa- sante 22 está dotado de una rosca externa en la que se enrosca una tuerca 21 o similar fijándose de este modo la varilla 12 al tubo base. Cabe decir que también se contemplan otros tipos de fijación para el extremo de la varilla 12 al soporte 19, los cuales pueden unirse por soldadura, remachado o simplemente por deformación del extremo de la varilla 12 que sobresale del orificio pasante 22. En cualquier caso, la varilla 12 queda dispuesta longitudinalmente en el interior del puntal 1 y atraviesa la tapa 8 del extremo inferior 7 del tubo interior 2 por el orificio pasante 9 (Fig. 4). En el extremo 18 contrario al que está fijado al tubo base 3, la varilla 12 está provista de un bloque de tope 6, que tal y como indica la Fig. 1, queda dispuesto dentro del tubo interior 2. Si se invierte el puntal 1 respecto de su posición de trabajo normal, el tubo 2 puede deslizarse por el interior del tubo base 3, en la dirección que indica la flecha 16 de la Fig. 2, hasta que la tapa 8 topa con el citado bloque de tope 6, pues el tamaño de éste es superior al diámetro del orificio pasante 9 de la tapa 8. En este punto el tubo interior 2 no puede desplazarse más en sentido hacia fuera. Esta situación se representa en la Fig. 2. Para amortiguar el impacto del bloque de tope 6 en la tapa 8, está provisto dotar al bloque de tope de un elemento amortiguador, tal como un muelle, una goma o similar, o realizar el mismo bloque de tope 6 a partir de un material que absorba parte del impacto. De igual modo, en el caso de que los medios de enlace 12 estén constituidos por un cable o similar, de acuerdo con otra variante de la invención, se prevé que éste tenga propiedades elásticas para absorber parte del impacto del bloque de tope 6 en la tapa 8, o en un elemento equivalente. Según sea la longitud de la varilla 12 y el tubo interior 2, éste estará totalmente extraído o no del tubo base 3 cuando el bloque de tope 6 detenga el deslizamiento del tubo interior 2 al topar con la tapa 8 del extremo inferior 7 del mismo. Así pues, si la varilla 12 es suficientemente larga, el tubo 2 podrá ser extraído totalmente del tubo base 3 pero permanecerán unidos por la varilla 12 y el bloque de tope 6. Por el contrario, si la varilla 12 es más corta que el tubo base 3, el tubo interior 2 no podrá ser extraído en su totalidad del tubo base 3. Las Figs. 3 y 4 muestran en detalle el extremo de la varilla 12, provista de un bloque de tope 6, y del extremo inferior 7 del tubo interior 2, respectivamente. En el caso de que la tapa 8 no sea extraíble, para facilitar el montaje del puntal 1 el tubo interior 2 está provisto de un segundo orificio pasante 10, de contorno igual al del bloque de tope 6, a través del cual dicho tope 6 puede introducirse en el interior del tubo interior 2. El segundo orificio pasante 10 está comunicado con el orificio pasante 9 de la tapa 8 mediante una ranura 11 , que permite disponer el tubo interior y la varilla 12 en línea una vez introducido el bloque de tope 6 en el tubo interior 2 por el orificio pasante 10, de modo que el tubo interior pueda ser introducido en el tubo base. La misma operación pero a la inversa debe realizarse en el caso de querer separar la varilla 12 del tubo interior 2 y sacar el bloque de tope 6 del interior del tubo interior 2. En el caso de que la varilla 12 fuese más larga que el tubo base 3, para garantizar que el bloque de tope 6 no pueda salir del interior del tubo interior 2 una vez éste se halle totalmente extraído del tubo base 3, puede dotarse al bloque de tope 6 de una sección de contorno poligonal, coincidente con el contorno del segundo orificio pasante 10 del lateral del tubo interior, de manera que el bloque de tope 6 sólo se podría sacar del tubo interior 2 a través del orificio 10, disponiendo la varilla 12 en posición perpendicular respecto del tubo interior 2, lo que resulta prácticamente imposible que se produzca casualmente o por accidente. Naturalmente, lo mismo ocurriría si la longitud del bloque de tope 6 es mayor que el diámetro del orificio 10. En el momento del montaje del puntal 1 ,y para facilitar la introducción de la varilla 12 por un extremo del tubo 2 y a través del orificio pasante 9 del extremo contrario, se ha previsto dotar al tubo 2, en la zona próxima al orificio pasante 9, de un estrechamiento gradual en el sentido hacia afuera de su sección interior, a modo de cuello o embudo, para que el extremo inferior de la varilla 12 sea dirigido hacia el orificio pasante 9. Dicha configuración a modo de embudo también se puede realizar en el tubo base 3, cerca del orificio pasante 22, si existe. Detailed description of the drawings Strut 1 of Figs. 1 and 2 is formed by two tubes, a first outer base tube 3 and a second inner tube 2, slidable inside the base tube 3 so that it can be extracted in greater or lesser measure according to the length that is wish for the prop. In said figures, the fixing means of both tubes 2 and 3 have not been shown, which allow them to be fixed once the strut 1 has been provided with the desired length for use. Fig. 1, which represents the strut 1 in non-extended position, shows that inside the base tube 3 are arranged the linking means 12, constituted by a rod that acts as a link between the two tubes 2 and 3. The rod 12 is removably coupled to the lower end 17 of the base tube 3. For this purpose, the rod 12 is provided at its end with a clamping ring 13, which is crossed by a pin 14 that crosses the base tube 3, and which is attached to it by screws 15 or any other known method. Alternatively to the system depicted in Figs. 1 and 2, the inventor has provided other types of fixing the end of the rod 12 to the lower end 17 of the base tube 3. An example of such systems is shown in Fig. 5, in which it can be seen that the rod 12 is provided at its attachable end with a widening 20 and that the lower end of the base tube 3 is provided with a lower support 19, in turn provided with a raised central portion 24 provided with a through hole 22, through which it introduces the end of the rod 12 to the said widening zone 20, which blocks the passage of the rod 12 through the through hole 22. This raised central portion 24 of the lower support 19 may be configured to receive, in the case that the strut is used in an inverted position to the usual one, a pivot of which usually protrude down the structure on which the formwork boards of a higher level rest. In said circumstances, the formwork would be supported, through said structure, on the lower support 19, which would act as the upper support. As an example, a lower support 19 is shown in a non-representative scale, which, due to the inverted use of the strut, performs the functions of upper support. The raised central portion 24 of said support is configured in the form of a deep recess to be able to receive the fit of a pivot 25 provided for this purpose in the support structure of a formwork board of an upper floor. In Fig. 5, the end 23 of the rod 12 protruding from the passing hole 22 is provided with an external thread in which a nut 21 or the like is screwed, thereby fixing the rod 12 to the base tube. It should be said that other types of fixing for the end of the rod 12 to the support 19 are also contemplated, which can be joined by welding, riveting or simply by deformation of the end of the rod 12 protruding from the through hole 22. In any case, the rod 12 is arranged longitudinally inside the strut 1 and passes through the cover 8 of the lower end 7 of the inner tube 2 through the through hole 9 (Fig. 4). At the end 18 opposite to the one attached to the base tube 3, the rod 12 is provided with a stop block 6, which, as indicated in Fig. 1, is arranged inside the inner tube 2. If the strut 1 is inverted with respect to its normal working position, the tube 2 can slide inside the base tube 3, in the direction indicated by arrow 16 of Fig. 2, until the cover 8 meets the said stop block 6, because the size of the latter is larger than the diameter of the through hole 9 of the cover 8. At this point the inner tube 2 can no longer move outwards. This situation is represented in Fig. 2. In order to dampen the impact of the stop block 6 on the cover 8, it is provided to provide the stop block with a damping element, such as a spring, a rubber or the like, or perform the same stop block 6 from a material that absorbs part of the impact. Similarly, in the event that the link means 12 is constituted by a cable or the like, according to another variant of the invention, it is envisaged that it has elastic properties for absorb part of the impact of the stop block 6 in the cover 8, or in an equivalent element. Depending on the length of the rod 12 and the inner tube 2, it will be totally or not completely removed from the base tube 3 when the stop block 6 stops the sliding of the inner tube 2 when it comes into contact with the cover 8 of the lower end 7 thereof. Thus, if the rod 12 is long enough, the tube 2 may be completely removed from the base tube 3 but will remain joined by the rod 12 and the stop block 6. On the contrary, if the rod 12 is shorter than the tube base 3, the inner tube 2 cannot be completely removed from the base tube 3. Figs. 3 and 4 show in detail the end of the rod 12, provided with a stop block 6, and the lower end 7 of the inner tube 2, respectively. In the event that the cover 8 is not removable, in order to facilitate the mounting of the strut 1 the inner tube 2 is provided with a second through hole 10, of equal contour to that of the stop block 6, through which said stop 6 can be inserted inside the inner tube 2. The second through hole 10 is connected to the through hole 9 of the cover 8 through a slot 11, which allows the inner tube and the rod 12 to be arranged in line once the stop block 6 is inserted in the inner tube 2 through the through hole 10, so that the inner tube can be introduced into the base tube. The same operation, but vice versa, should be carried out in the case of wanting to separate the rod 12 from the inner tube 2 and remove the stop block 6 from the inside of the inner tube 2. In the event that the rod 12 was longer than the tube base 3, to ensure that the stop block 6 cannot exit from inside the inner tube 2 once it is completely removed from the base tube 3, the stop block 6 can be provided with a polygonal contour section, coincident with the contour of the second through hole 10 on the side of the inner tube, so that the stop block 6 could only be removed from the inner tube 2 through the hole 10, the rod 12 being arranged perpendicularly with respect to the inner tube 2, which is practically impossible to happen casually or by accident. Naturally, the same would happen if the length of the stop block 6 is greater than the diameter of the hole 10. At the time of mounting the strut 1, and to facilitate the introduction of the rod 12 through one end of the tube 2 and through the hole intern 9 of opposite end, it is envisaged to provide the tube 2, in the area near the through hole 9, with a gradual narrowing in the outward direction of its inner section, as a neck or funnel, so that the lower end of the rod 12 it is directed towards the through hole 9. Such funnel configuration can also be made in the base tube 3, near the through hole 22, if it exists.

Claims

R E I V I N D I C A C I O N E S
1.- Puntal (1), particularmente aplicable a encofrados, extensible mediante la extracción de un tubo interior (2) dispuesto coaxial en un tubo base exterior (3), que comprende unos medios de fijación de la posición de dicho tubo interior respecto del tubo exterior base y de un dispositivo de seguridad que impide la separación total de ambos tubos cuando los medios de fijación están inoperativos, caracterizado porque el dispositivo de seguridad comprende unos medios de enlace (12) entre ambos tubos, que impiden su separación pero permiten el desplazamiento del extremo inferior (7) del tubo interior (2) entre dos puntos fijos, de los que el primer punto está dispuesto en el interior del tubo base exterior (3), en tanto que el segundo punto viene determinado por la longitud de dichos medios de enlace. 1.- Strut (1), particularly applicable to formwork, extensible by extracting an inner tube (2) arranged coaxially in an outer base tube (3), which comprises means for fixing the position of said inner tube with respect to the base outer tube and a safety device that prevents the total separation of both tubes when the fixing means are inoperative, characterized in that the security device comprises means of connection (12) between both tubes, which prevent their separation but allow the displacement of the lower end (7) of the inner tube (2) between two fixed points, of which the first point is arranged inside the outer base tube (3), while the second point is determined by the length of said liaison means
2.- Puntal (1) según la reivindicación 1 , caracterizado porque los medios de enlace (12) están constituidos por un elemento de unión delgado y alargado, tal como una varilla, un cable o similar, longitudinalmente dispuesto en el interior del tubo base exterior (3), estando el primer extremo (17) del elemento de unión fijado amoviblemente en un extremo del citado tubo exterior (3) mien- tras que el extremo contrario (18), introducido en el tubo interior (2), está provisto de un bloque de tope (6) que impide su extracción del tubo interior al topar contra un elemento retenedor solidario del extremo inferior (7) del tubo interior, impidiendo la salida del bloque de tope (6) del interior del tubo interno. 2. Strut (1) according to claim 1, characterized in that the connecting means (12) are constituted by a thin and elongated connecting element, such as a rod, a cable or the like, longitudinally arranged inside the base tube outer (3), the first end (17) of the connecting element removably fixed at one end of said outer tube (3) while the opposite end (18), inserted into the inner tube (2), is provided of a stop block (6) that prevents its removal from the inner tube by bumping against a retaining element integral with the lower end (7) of the inner tube, preventing the exit of the stop block (6) from inside the inner tube.
3.- Puntal (1) según la reivindicación 2, caracterizado porque el elemento retenedor está formado por una tapa (8), la cual está provista de un orificio pasante (9), cuyo diámetro es menor que la del bloque de tope (6), por lo que permite el paso a su través del elemento de unión (12) pero impide el paso del bloque de tope (6).3. Strut (1) according to claim 2, characterized in that the retaining element is formed by a cover (8), which is provided with a through hole (9), whose diameter is smaller than that of the stop block (6 ), thus allowing the passage through the connecting element (12) but prevents the passage of the stop block (6).
4.- Puntal (1) según las reivindicaciones 2 ó 3, caracterizado porque el tubo interior (2) está provisto de un segundo orificio pasante (10) en un lateral, adyacente al orificio (9) de la tapa (8), preferentemente de sección igual a la del bloque de tope (6) y comunicado con dicho orificio de la tapa mediante una ranura (11), de anchura sensiblemente superior a la del elemento de unión (12). 4. Strut (1) according to claims 2 or 3, characterized in that the inner tube (2) is provided with a second through hole (10) on one side, adjacent to the hole (9) of the cover (8), preferably of equal section to that of the stop block (6) and communicated with said hole of the lid by means of a slot (11), of a width substantially greater than that of the connecting element (12).
PCT/ES2004/000469 2003-10-31 2004-10-27 Stanchion WO2005042879A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US10/577,851 US20070164184A1 (en) 2003-10-31 2004-10-27 Prop
EP04791388A EP1693534A1 (en) 2003-10-31 2004-10-27 Stanchion

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES200302547A ES2231036B1 (en) 2003-10-31 2003-10-31 STRUT.
ESP200302547 2003-10-31

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WO2005042879A1 true WO2005042879A1 (en) 2005-05-12

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US (1) US20070164184A1 (en)
EP (1) EP1693534A1 (en)
CN (1) CN100432357C (en)
ES (1) ES2231036B1 (en)
RU (1) RU2348775C2 (en)
WO (1) WO2005042879A1 (en)

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ES2398886A1 (en) * 2011-05-23 2013-03-22 Diego M. DEL CASTILLO GÓMEZ Fixing system of tubular elements. (Machine-translation by Google Translate, not legally binding)
CN106013841A (en) * 2016-06-17 2016-10-12 哈尔滨金玉科技开发有限公司 Building bearing column
CN106088664A (en) * 2016-06-17 2016-11-09 哈尔滨金玉科技开发有限公司 A kind of adjustable building bearing post
CN106121273A (en) * 2016-06-17 2016-11-16 哈尔滨金玉科技开发有限公司 A kind of building-supporting device
US10975585B2 (en) 2018-10-15 2021-04-13 Peri Formwork Systems, Inc. Connection assembly for formwork

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US20080216447A1 (en) * 2007-03-05 2008-09-11 Tian-Tsz Hung Positioning Device For Window Frame
US7954782B2 (en) * 2007-08-14 2011-06-07 Benjamin Simpson Harralson Picture hanging position finder and wall marking device
US7950615B2 (en) * 2009-03-30 2011-05-31 Jung-Wen Lu Press-fit extendable support rod
US20170002538A1 (en) * 2015-06-30 2017-01-05 Trinity Shoring Products, Inc. System and Method for a Telescopic Strut

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ES1031628U (en) 1995-07-10 1996-01-16 Ulma S Coop Strut with captive device for the inner tube. (Machine-translation by Google Translate, not legally binding)
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2398886A1 (en) * 2011-05-23 2013-03-22 Diego M. DEL CASTILLO GÓMEZ Fixing system of tubular elements. (Machine-translation by Google Translate, not legally binding)
CN106013841A (en) * 2016-06-17 2016-10-12 哈尔滨金玉科技开发有限公司 Building bearing column
CN106088664A (en) * 2016-06-17 2016-11-09 哈尔滨金玉科技开发有限公司 A kind of adjustable building bearing post
CN106121273A (en) * 2016-06-17 2016-11-16 哈尔滨金玉科技开发有限公司 A kind of building-supporting device
US10975585B2 (en) 2018-10-15 2021-04-13 Peri Formwork Systems, Inc. Connection assembly for formwork

Also Published As

Publication number Publication date
US20070164184A1 (en) 2007-07-19
EP1693534A1 (en) 2006-08-23
CN1875158A (en) 2006-12-06
ES2231036A1 (en) 2005-05-01
RU2348775C2 (en) 2009-03-10
CN100432357C (en) 2008-11-12
RU2006113746A (en) 2007-12-10
ES2231036B1 (en) 2006-07-01

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