EP1436472B1 - Telescopic support, particularly for building use - Google Patents

Telescopic support, particularly for building use Download PDF

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Publication number
EP1436472B1
EP1436472B1 EP02788518A EP02788518A EP1436472B1 EP 1436472 B1 EP1436472 B1 EP 1436472B1 EP 02788518 A EP02788518 A EP 02788518A EP 02788518 A EP02788518 A EP 02788518A EP 1436472 B1 EP1436472 B1 EP 1436472B1
Authority
EP
European Patent Office
Prior art keywords
corrugations
support according
telescopic support
safety
inner element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02788518A
Other languages
German (de)
French (fr)
Other versions
EP1436472A1 (en
Inventor
Guido Faresin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Faresin SpA
Original Assignee
Faresin SpA
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 Faresin SpA filed Critical Faresin SpA
Publication of EP1436472A1 publication Critical patent/EP1436472A1/en
Application granted granted Critical
Publication of EP1436472B1 publication Critical patent/EP1436472B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • E04G25/06—Shores or struts; Chocks telescopic with parts held together by positive means
    • 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 telescopic support, particularly for building use, of the type including the features set out in the preamble to the main claim.
  • This support is subject to combined bending and compressive stress of the elements of which it is composed.
  • the inner element which is necessarily of smaller dimensions so that it can be fitted inside the outer element, is the element which is subject to the most critical stress.
  • the first and most widespread arrangement is that of making the inner element of a different and stronger, although heavier, material than that used for the construction of the outer element.
  • the outer element is made of aluminium alloy and the Inner element is made of steel.
  • a telescopic support having the features outlined in the preamble of the main claim is disclosed in US 5388666.
  • the main task of the invention is to provide a support, particularly for building works, which is designed structurally and functionally to overcome the disadvantages discussed with reference to the prior art mentioned.
  • An important object of the present invention is to provide a telescopic support in which the problems of wear connected with adjustment with ring nuts are prevented.
  • Yet another object is to provide a support with a structure such that problems of slipping-out are prevented.
  • Yet another object is that of providing a support having a simple structure.
  • One of the main objects is to provide an inexpensive telescopic support structure.
  • a telescopic support particularly for building works, with a structure according to the invention, is generally indicated 10.
  • the support 10 comprises an inner tubular element 11, slidable telescopically in an outer tubular element 12.
  • the elements 11 and 12 are provided with shaped support plates 13 at their ends.
  • the inner element 11 is made of extruded aluminium alloy and has, in cross-section, a series of recurring corrugations extending substantially continuously longitudinally and distributed at regular intervals around both its inner periphery and its outer periphery.
  • the resisting cross-section which is subject to compression stress is thus increased and a stiffening of the inner element of the support, which increases its strength, is also achieved.
  • the corrugations have an approximately sinusoidal shape with respect to a median circle of the element 11 and portions of screw thread are formed on at least some of the outer ridges, so as to form a plurality of thread sectors 17.
  • the corrugations define a plurality of first re-entrant portions 14 arranged circumferentially at intervals of 45° and an outer profile having longitudinal recesses 15 which define ridges or first projections 16, also spaced apart circumferentially by 45°.
  • the outer corrugations may be formed by milling and, in this case, the inner tubular element is initially provided with a continuous external screw thread which is subsequently milled to produce longitudinal recesses 15 as indicated above.
  • the outer tubular element 12 also has a shaped cross-section with an inner profile defining second projections and second re-entrant portions, 18 and 19, respectively.
  • a thread sector of one first projection 16 is removed, for example, by a mechanical flattening process, so as to produce a flat and slightly recessed surface 16a.
  • the extension of the inner element 11 from the outer element 12 is adjusted by clamping means which can lock the relative sliding of the elements in at least one of the two directions of sliding.
  • a ring nut 20 engaged by male/female screw coupling on the interrupted thread portions of the inner element 11, is used for this purpose and, in conditions of use, comes into stop abutment bearing on a shaped plate 21 fixed firmly to the top of the outer element 12.
  • the shaped plate 21 is made of tough metal to prevent problems of wear of the bearing surface between the plate 21 and the ring nut 20 owing mutual friction during extension-adjustment operations.
  • the assembly constituted by the inner element 11 and by the ring nut 20 is clamped in the desired position by a spring hook 22 which is articulated to the top of the element 12 and engages on a lower flange 23 of the ring nut 20.
  • a plate 27 suitable for forming a catch for the pawl 25 is fixed in the second re-entrant portion 19a, in the vicinity of the upper end of the outer element 12, by means of screws 26.
  • the pawl 25 and the plate 27 ensure both that it is completely impossible for the inner element 11 to slip out of the outer element, and that a portion 28 of the inner element 11 is inserted in the outer element 12, thus ensuring the stability of the assembly in use.
  • the inner and outer elements 11 and 12 may be made of aluminium alloy or of another light alloy.
  • the present invention has been found in practice to have led to the achievement of the objects proposed.
  • a support structure is provided which prevents problems of wear connected with the operation to adjust the relative extension of the inner and outer elements.
  • the support 10 solves the problem of slipping of the inner element 11 out of the outer element 12 as well as setting-up problems with regard to reduced stability should the support 10 be used with the element 11 extending too far from the outer element 12; the portions of the two tubular elements which interact are thus sufficient to ensure the equilibrium and stability of the assembly with respect to the vertical axis.
  • the structure is simple and inexpensive.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
  • Tents Or Canopies (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Ladders (AREA)
  • Clamps And Clips (AREA)

Abstract

A telescopic support (10), particularly for building use, comprises at least two tubular elements, that is, an outer element (12) and an inner element (11), slidable telescopically one inside the other, and clamping means (20) for locking the relative sliding of the elements in at least one of the directions of sliding. The inner element (11) has, in cross-section, a series of recurring corrugations extending substantially continuously longitudinally and distributed at regular intervals around its circumference.

Description

Technical field of the Invention
The subject of the present invention is a telescopic support, particularly for building use, of the type including the features set out in the preamble to the main claim.
Technological background
A support with these features is known from EP 553666.
This support, like other similar devices formed in accordance with the prior art, is subject to combined bending and compressive stress of the elements of which it is composed. Of these, the inner element, which is necessarily of smaller dimensions so that it can be fitted inside the outer element, is the element which is subject to the most critical stress.
Various arrangements have been developed to ensure the strength of the inner element.
The first and most widespread arrangement is that of making the inner element of a different and stronger, although heavier, material than that used for the construction of the outer element. Typically, the outer element is made of aluminium alloy and the Inner element is made of steel. Moreover, it is usual to make the inner element considerably shorter than the outer element.
Although, on the one hand, all of these arrangements favour the strength of the support, even though it is subjected to large loads, on the other hand, they compromise its weight, manoeuvrability, and suitability for large longitudinal adjustments, as well as its ability, as a whole, to withstand combined bending and compressive stress.
A telescopic support having the features outlined in the preamble of the main claim is disclosed in US 5388666.
Description of the invention
The main task of the invention is to provide a support, particularly for building works, which is designed structurally and functionally to overcome the disadvantages discussed with reference to the prior art mentioned.
An important object of the present invention is to provide a telescopic support in which the problems of wear connected with adjustment with ring nuts are prevented.
Yet another object is to provide a support with a structure such that problems of slipping-out are prevented.
Yet another object is that of providing a support having a simple structure.
One of the main objects is to provide an inexpensive telescopic support structure.
The main task, the objects set out, and others which will become clearer from the following, are achieved by a telescopic support, particularly for building use, formed in accordance with the appended claims.
Brief description of the drawings
Further characteristics and advantages of the invention will become clearer from the description of a preferred but not exclusive embodiment thereof, indicated by way of non-limiting example with reference to the drawings, in which:
  • Figure 1 shows, in a perspective view, a telescopic support, particularly for building use, with a structure according to the invention,
  • Figure 2 shows a portion of a support according to the invention in longitudinal section, and
  • Figure 3 shows the support of the previous drawings in cross-section.
    • Preferred embodiment of the invention
    With particular reference to the drawings described above, a telescopic support, particularly for building works, with a structure according to the invention, is generally indicated 10.
    The support 10 comprises an inner tubular element 11, slidable telescopically in an outer tubular element 12. The elements 11 and 12 are provided with shaped support plates 13 at their ends.
    As can be seen in Figure 3, the inner element 11 is made of extruded aluminium alloy and has, in cross-section, a series of recurring corrugations extending substantially continuously longitudinally and distributed at regular intervals around both its inner periphery and its outer periphery. The resisting cross-section which is subject to compression stress is thus increased and a stiffening of the inner element of the support, which increases its strength, is also achieved.
    The corrugations have an approximately sinusoidal shape with respect to a median circle of the element 11 and portions of screw thread are formed on at least some of the outer ridges, so as to form a plurality of thread sectors 17.
    The corrugations define a plurality of first re-entrant portions 14 arranged circumferentially at intervals of 45° and an outer profile having longitudinal recesses 15 which define ridges or first projections 16, also spaced apart circumferentially by 45°.
    Alternatively, the outer corrugations may be formed by milling and, in this case, the inner tubular element is initially provided with a continuous external screw thread which is subsequently milled to produce longitudinal recesses 15 as indicated above.
    The outer tubular element 12 also has a shaped cross-section with an inner profile defining second projections and second re-entrant portions, 18 and 19, respectively.
    There is thus a series of recurring corrugations extending substantially continuously longitudinally and spaced apart at regular intervals around the circumference of the element with an approximately sinusoidal shape with respect to the median circle of the element and with a profile complementary with the corrugations of the inner element 11.
    As can be seen in Figure 3, when the inner element 11 is fitted in the outer element 12, the first projections 16 of the inner element 11 fit in the second re-entrant portions 19 of the outer element 12 so that the support 10 has a plurality of points of contact between the two tubular elements 11 and 12 even in the presence of minimal oscillations, ensuring a considerable increase in the stability of the structure in comparison with conventional systems.
    A thread sector of one first projection 16 is removed, for example, by a mechanical flattening process, so as to produce a flat and slightly recessed surface 16a.
    The extension of the inner element 11 from the outer element 12 is adjusted by clamping means which can lock the relative sliding of the elements in at least one of the two directions of sliding. A ring nut 20 engaged by male/female screw coupling on the interrupted thread portions of the inner element 11, is used for this purpose and, in conditions of use, comes into stop abutment bearing on a shaped plate 21 fixed firmly to the top of the outer element 12.
    The shaped plate 21 is made of tough metal to prevent problems of wear of the bearing surface between the plate 21 and the ring nut 20 owing mutual friction during extension-adjustment operations.
    Upon completion of the adjustment, the assembly constituted by the inner element 11 and by the ring nut 20 is clamped in the desired position by a spring hook 22 which is articulated to the top of the element 12 and engages on a lower flange 23 of the ring nut 20.
    A safety pawl 25, fixed in a corresponding threaded hole 24 in the flat surface 16a of the inner element 11, extends in the corresponding second re-entrant portion 19a of the outer element 12.
    A plate 27 suitable for forming a catch for the pawl 25 is fixed in the second re-entrant portion 19a, in the vicinity of the upper end of the outer element 12, by means of screws 26.
    The pawl 25 and the plate 27 ensure both that it is completely impossible for the inner element 11 to slip out of the outer element, and that a portion 28 of the inner element 11 is inserted in the outer element 12, thus ensuring the stability of the assembly in use.
    Advantageously, the inner and outer elements 11 and 12 may be made of aluminium alloy or of another light alloy.
    The present invention has been found in practice to have led to the achievement of the objects proposed.
    Moreover, a support structure is provided which prevents problems of wear connected with the operation to adjust the relative extension of the inner and outer elements.
    Furthermore, the support 10 solves the problem of slipping of the inner element 11 out of the outer element 12 as well as setting-up problems with regard to reduced stability should the support 10 be used with the element 11 extending too far from the outer element 12; the portions of the two tubular elements which interact are thus sufficient to ensure the equilibrium and stability of the assembly with respect to the vertical axis.
    The structure is simple and inexpensive.

    Claims (13)

    1. A telescopic support, particularly for building use, comprising at least two tubular elements, that is, an outer element (12) and an inner element (11), slidable telescopically one inside the other, and clamping means for locking the relative sliding of the elements in at least one of the directions of sliding, the inner element (11) having, in cross-section, a series of recurring corrugations extending substantially continuously longitudinally and distributed at regular intervals around the circumference of the element, characterised in that between two corrugations angularly spaced apart by 90° an additional corrugation is present which is spaced at 45° of the two corrugations angularly spaced apart by 90°, said additional corrugation having the same shape as the two corrugations angularly spaced apart by 90°.
    2. A telescopic support according to Claim 1 in which he corrugations have an approximately sinusoidal shape with respect to a median circle of the inner element.
    3. A support according to Claim 1 or Claim 2, characterized in that portions of a screw thread (17) having interrupted portions are formed on at least some of the outer ridges of the corrugations, the thread extending on at least part of the inner element (11) and forming part of the clamping means.
    4. A telescopic support according to claim 3, wherein said screw thread (17) is formed in all but one outer ridges of the corrugations.
    5. A telescopic support according to one or more of the preceding claims, characterized in that the outer element (12) also has, in cross-section, a series of recurring corrugations extending substantially continuously longitudinally and distributed at regular intervals around the circumference of the element, the corrugations being complementary with the corrugations of the inner element (11).
    6. A telescopic support according to one or more of the preceding claims, the inner tubular element having an outer surface with a screw thread (17) with interrupted portions, an adjustment ring-nut (20) being engaged on the thread (17) by male/female screw coupling, and in which a flattened portion (16a) is provided on one of the corrugations (16) to provide a recessed flat surface on which at least one safety element (25) is fixed at a predetermined distance from the lower end, the safety element (25) extending in a corresponding second re-entrant portion (19a) of the outer tubular element (12) which in turn carries, fixed in the vicinity of the upper end of the outer tubular element, a catch and stop element (27) for the safety element, for preventing slipping-out.
    7. A support according to Claim 5, characterized in that the safety element comprises a safety pawl (25).
    8. A support according to Claim 6, characterized in that the pawl is engaged by male/female screw coupling in a corresponding threaded hole (24) formed in the flat surface (16a).
    9. A support according to one or more of the preceding claims, characterized in that the catch element comprises a keep plate (27).
    10. A support according to Claim 8, characterized in that the plate (27) is fixed, by means of screws (26), in the vicinity of the upper end of the outer tubular element.
    11. A support according to one or more of the preceding claims, comprising a spring hook (22) which is articulated to the upper end of the outer element (12) and which engages on a flange (23) of the ring nut.
    12. A support according to one or more of the preceding claims, characterized in that it comprises a shaped plate (21) which is fixed firmly to the upper end of the outer tubular element (12) and with which the ring nut (20) comes into stop abutment, bearing thereon, in conditions of use.
    13. A support according to Claim 11, characterised in that the shaped plate (21) is made of tough metal less susceptible to wear than the material of the ring nut.
    EP02788518A 2001-10-17 2002-10-16 Telescopic support, particularly for building use Expired - Lifetime EP1436472B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    IT2001PD000098U ITPD20010098U1 (en) 2001-10-17 2001-10-17 TELESCOPIC SHORE STRUCTURE PARTICULARLY FOR CONSTRUCTION USE
    ITPD20010098U 2001-10-17
    PCT/IT2002/000663 WO2003033839A1 (en) 2001-10-17 2002-10-16 Telescopic support, particularly for building use

    Publications (2)

    Publication Number Publication Date
    EP1436472A1 EP1436472A1 (en) 2004-07-14
    EP1436472B1 true EP1436472B1 (en) 2005-01-26

    Family

    ID=11452334

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP02788518A Expired - Lifetime EP1436472B1 (en) 2001-10-17 2002-10-16 Telescopic support, particularly for building use

    Country Status (8)

    Country Link
    EP (1) EP1436472B1 (en)
    AT (1) ATE288005T1 (en)
    DE (1) DE60202792T2 (en)
    ES (1) ES2236606T3 (en)
    HU (1) HU224892B1 (en)
    IT (1) ITPD20010098U1 (en)
    PT (1) PT1436472E (en)
    WO (1) WO2003033839A1 (en)

    Families Citing this family (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    ITUD20050150A1 (en) * 2005-09-21 2007-03-22 Pilosio Spa SUPPORT DEVICE FOR REALIZING FORMWORKS FOR FLOORS OR SIMILAR BUILDINGS
    EP1849930B1 (en) * 2006-04-26 2016-01-13 Soletanche Freyssinet Support arm for a modular scaffolding system as well as modular scaffolding with such an arm
    FR3000122B1 (en) * 2012-12-20 2015-12-11 Merle BODY GUARD WITH ANTI-FALL SYSTEM
    SE545619C2 (en) * 2020-03-11 2023-11-14 Balco Group Ab Telescopic pillar system and the use of such pillar system

    Family Cites Families (7)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    BE503073A (en) * 1950-05-08
    FR2225033A5 (en) * 1973-04-04 1974-10-31 Koehl Ets Building excavation shoring strut - has tube with bearing-plate screw with angle and stop-pieces and stop nut
    GB8829025D0 (en) * 1988-12-13 1989-01-25 Le May Edwina J Veterinary composition
    DE4206573A1 (en) 1992-01-25 1993-07-29 Peri Gmbh HEIGHT-ADJUSTABLE SUPPORT
    DE4201958A1 (en) * 1992-01-25 1993-08-05 Peri Gmbh CARRYING FRAME
    GB2265921B (en) * 1992-04-08 1995-05-24 Sgb Holdings Ltd Improvements in or relating to a shoring leg
    GB9725720D0 (en) * 1997-12-04 1998-02-04 Sgb Services Plc A shoring leg

    Also Published As

    Publication number Publication date
    ITPD20010098U1 (en) 2003-04-17
    HU224892B1 (en) 2006-04-28
    WO2003033839A1 (en) 2003-04-24
    HUP0401848A2 (en) 2004-12-28
    DE60202792D1 (en) 2005-03-03
    ES2236606T3 (en) 2005-07-16
    ATE288005T1 (en) 2005-02-15
    PT1436472E (en) 2005-06-30
    EP1436472A1 (en) 2004-07-14
    DE60202792T2 (en) 2006-01-12

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