EP0835970B1 - Raccord pour tube d'échafaudage comportant des parties de raccord mâle et femelle et tube d'échafaudage - Google Patents

Raccord pour tube d'échafaudage comportant des parties de raccord mâle et femelle et tube d'échafaudage Download PDF

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Publication number
EP0835970B1
EP0835970B1 EP97203120A EP97203120A EP0835970B1 EP 0835970 B1 EP0835970 B1 EP 0835970B1 EP 97203120 A EP97203120 A EP 97203120A EP 97203120 A EP97203120 A EP 97203120A EP 0835970 B1 EP0835970 B1 EP 0835970B1
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EP
European Patent Office
Prior art keywords
coupling part
male
female coupling
scaffolding tube
scaffolding
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
EP97203120A
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German (de)
English (en)
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EP0835970A1 (fr
Inventor
Henri Frans Marie Jegerings
Wim Van Maurik
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.)
Verenigde Bedrijven van Thiel BV
Original Assignee
Verenigde Bedrijven van Thiel BV
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Publication date
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Publication of EP0835970A1 publication Critical patent/EP0835970A1/fr
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Publication of EP0835970B1 publication Critical patent/EP0835970B1/fr
Anticipated expiration legal-status Critical
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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
    • E04G7/00—Connections between parts of the scaffold
    • E04G7/30—Scaffolding bars or members with non-detachably fixed coupling elements
    • E04G7/301—Scaffolding bars or members with non-detachably fixed coupling elements for connecting bars or members which are parallel or in end-to-end relation

Definitions

  • the invention relates to a scaffolding tube connecting piece for interconnecting two scaffolding tubes in longitudinal direction according to the precharacterizing portion of claim 1.
  • connection piece is known from US-A-1 762 572.
  • European scaffolding practice for interconnecting scaffolding tubes in longitudinal direction, use is made of couplings which form an interruption in the external profile of the intercoupled scaffolding tubes. As a consequence of this interruption, at the location of the longitudinal connection, no so-called cross coupling can be provided for mounting a cross scaffolding tube extending at an angle to the scaffolding tubes that are interconnected in longitudinal direction.
  • the freedom for positioning the cross couplings for the cross scaffolding tubes is limited considerably. In practice, this has as a consequence that the different floors of a scaffold cannot be provided at the desired height.
  • the US-patent mentioned above teaches a scaffolding tube connecting piece for interconnecting two scaffolding tubes in longitudinal direction, which scaffolding tube connecting piece comprises a male and a female coupling part that are each undetachably connectable, by a connecting end thereof, to a scaffolding tube end, and of which scaffolding tube connecting piece the maximum external diameter corresponds to the external diameter of the scaffolding tubes to be connected.
  • the male coupling part is provided with a stub having smaller external cross dimensions than the internal diameter of the scaffolding tubes.
  • the stub comprises two bayonet cross protrusions evenly distributed over the circumference of the stub.
  • the female coupling part is provided with a receiving recess which is bounded, at this free end, by a bayonet ring having two recesses for letting through the bayonet cross protrusions when the male part is in an inserting position relative to the female coupling part.
  • the stub-receiving recess has internal cross dimensions such that the stub is fittingly receivable therein.
  • the stub-receiving recess is provided with a cross protrusion receiving portion having enlarged internal cross dimensions relative to the stub receiving recess, such that from the inserting position relative to the female coupling part, the male coupling part is rotatable into a coupled position in which the male and the female coupling parts are interconnected.
  • Each bayonet ring segment located between two recesses is provided with a bayonet ring run-on face which, viewed in the rotary direction of the male coupling part to be followed relative to the female coupling part during the coupling operation, encloses an angle of inclination ⁇ with a plane extending perpendicularly to the longitudinal axis of the female coupling part.
  • Each cross protrusion is provided, on a side facing the connecting end, with a cross protrusion run-on face which, viewed in the rotary direction of the male part to be followed relative to the female coupling part during the coupling operation, encloses an angle of inclination ⁇ with a plane extending perpendicularly to the longitudinal axis of the coupling part.
  • the female coupling part has its free end provided with an abutting face which, in coupled position of the male and female coupling parts and under influence of the run-on faces of the bayonet cross protrusions and the bayonet ring segments in a contact area abuts against an abutting face on the male part 1.
  • This known scaffolding tube connecting piece has the particular advantage that due to the fact that the maximum external diameter of the coupling parts corresponds to the external diameter of the scaffolding tubes to be connected, an uninterrupted outside profile of the coupled scaffolding tubes is obtained at the location of the scaffolding tube connecting piece in coupled condition of the scaffolding tubes. This enables mounting a cross coupling at any desired location of the coupled scaffolding tubes for fitting a cross scaffolding tube.
  • the object of the invention is to provide a scaffolding tube connecting piece which provides the possibility of positioning cross couplings at any desired position of two longitudinally interconnected scaffolding tubes, which scaffolding tube connecting piece complies with the safety standards set in Europe, for instance the standard EN-74.
  • the scaffolding tube connecting piece for longitudinally interconnecting two scaffolding tubes according to the precharacterizing portion of claim 1 is, according to the invention, characterized by the characterizing portion of claim 1.
  • the resistance to deflection of the scaffolding tube connecting piece is particularly great.
  • the area of contact extends adjacent the outer circumference of the male and female coupling parts, a greater arm is created during bending of the scaffolding tube connecting piece than in the case of the scaffolding tube connecting piece known from the US-A-1 762 572.
  • this arm is meant the distance between the area of contact and the neutral line in which no stresses occur during bending of the coupling parts.
  • the coupling parts are manufactured from cast iron or cast steel, it is particularly favorable when the angles of inclination ⁇ and ⁇ are less than 7°, while it is preferred that the angles ⁇ and ⁇ be about 4°.
  • the invention also relates to a scaffolding tube provided at one end thereof with a male coupling part of a scaffolding tube connecting piece according to the invention, and provided at the other end thereof with a female coupling part of a scaffolding tube connecting piece according to the invention.
  • Figs. 1-6 show elevations, sections and a detail of the female coupling part 2 and Figs. 7-10 show elevations, a section and a detail of the male coupling part 1 of the scaffolding tube connecting piece for interconnecting two scaffolding tubes T in longitudinal direction.
  • Both the male coupling part 1 and the female coupling part 2 comprise a connecting end 3, 4 respectively, formed by a cylindrical part 17, 18 respectively having an external diameter that is fittingly receivable in the scaffolding tube T associated therewith.
  • the surface of the cylindrical part 17, 18 has been provided with a number of recesses 19.
  • the scaffolding tube surface is pressed, by local plastic deformation, into the recesses 19 to form an undetachable connection between the scaffolding tube T and the coupling part 1, 2.
  • the recesses 19 may also of a design other than shown, for instance in the form of two perpendicularly extending grooves into which the scaffolding tube surface can be pressed.
  • the maximum external diameter of the coupling parts 1, 2 corresponds to the external diameter of the scaffolding tubes T to be connected.
  • the male coupling part 1 shown in Figs. 7-10 comprises a stub 6 having smaller external cross dimensions than the internal diameter of the scaffolding tubes T.
  • the stub 6 comprises two bayonet cross protrusions 7 evenly distributed over the circumference of the stub 6.
  • the female coupling part 2 shown in Figs. 1-6 comprises a stub-receiving recess 9 bounded, at this free end 8, by a bayonet ring 10 having at least two recesses 11.
  • the recesses 11 serve for letting through the bayonet cross protrusions 7 when the male coupling part 1 is in an inserting position relative to the female coupling part 2.
  • the stub-receiving recess 9 has internal cross dimensions such that the stub 6 is fittingly receivable therein.
  • the stub-receiving recess comprises a cross protrusion-receiving portion 12 having enlarged internal cross dimensions relative to the stub-receiving recess 9, such that the male coupling part 1 is rotatable from the inserting position relative to the female coupling part 2 into a coupled position in which the male and the female coupling part 1, 2 are interconnected.
  • Each bayonet ring segment 10, 10' located between two recesses 11 is provided with a bayonet ring run-on face 13 which, viewed in the rotary direction of the male part 1 to be followed relative to the female coupling part 2 during the coupling operation, encloses an angle of inclination ⁇ with a plane extending perpendicularly to the longitudinal axis of the female coupling part 2.
  • each cross protrusion 7 also comprises a cross protrusion run-on face 14 which, viewed in the rotary direction of the male coupling part 1 to be followed relative to the female coupling part 2 during the coupling operation, encloses an angle of inclination ⁇ with a plane extending perpendicularly to the longitudinal axis of the male part.
  • the female coupling part 2 comprises an abutting face 15 which, in coupled position of the male and the female coupling part 1, 2 and under influence of the run-on faces 14, 13 respectively of the bayonet cross protrusions 7 and the bayonet ring segments 10, 10' in a contact area 15a, 16a abuts against an abutting face 16 on the male part 1.
  • the angles of inclination ⁇ and ⁇ are so small that in the coupled position, a self-locking connection is established between the male and the female coupling part 1, 2.
  • the angles of inclination ⁇ and ⁇ should be less than 7°, and in the present, preferred exemplary embodiment, the angles of inclination ⁇ and ⁇ are about 4°.
  • the coupling parts 1, 2 are manufactured from cast iron, such angles of inclination ⁇ and ⁇ furnish a self-locking connection between the male and the female coupling parts, so that the unintentional loosening of the connection between the two coupling parts 1, 2 is prevented.
  • the contact area 15a, 16a between the abutting face 16 of the male coupling part 1 and the abutting face 15 of the female coupling part 2 comprise a substantially annular area 15a, 16a, extending adjacent the outer circumference of the male and the female coupling parts 1, 2.
  • the abutting face 16 of the male coupling part 1 has a frusto-conical configuration, wherein the axis of the conical abutting face 16 coincides with the longitudinal axis of the male part 1, wherein the conical abutting face 16 encloses an angle ⁇ with a plane extending perpendicularly to the longitudinal axis of the male part 1, wherein the abutting face 15 of the female coupling part 2 also has a frusto-conical configuration, wherein the axis of that conical abutting face 15 coincides with the longitudinal axis of the female part 2, wherein the conical abutting face 15 of the female part 2 encloses an angle ⁇ with a plane extending perpendicularly to the longitudinal axis of the female part, and wherein angle ⁇ is smaller than angle ⁇ .
  • the conical abutting face 15 of the female part 2 will abut against the abutting face 16 of the male part only at the outer edge 15a thereof, to obtain an annular contact area 15a, 16a extending adjacent the outer circumference of the male and the female coupling parts 1, 2.
  • the magnitude of the angle ⁇ is about 15° and the magnitude of the angle ⁇ is about 20°.
  • Both the male and the female coupling part 1, 2 are provided with marks 21 and 20 respectively, indicating whether the two coupling parts 1, 2 in the coupled position have been rotated relative to each other insufficiently, sufficiently or, by contrast, too much.
  • the marks 20, 21 are formed by two notches 20 on the female coupling part 2 and one notch 21 on the male coupling part 1.
  • the marks 20, 21 may also be provided the other way round or be of a different design.
  • the male coupling part 1 When the rotation of the male coupling part 1 relative to the female part 2 is so slight that the notch 21 is not located between the notches 20, the male coupling part 1 has not been properly inserted into the female coupling part 2.
  • the male coupling part 1 can be rotated into the female coupling part 2 so far that the notch 21 can be rotated beyond the area bounded by the two notches 20, at least one of the run-on faces 13, 14 is worn in such a manner that the scaffolding tube connecting piece is no longer usable and has to be replaced.
  • the run-on faces 13, 14 of the bayonet ring segments 10, 10' and the cross protrusions 7 respectively are likewise of frusto-conical design.
  • the frusto-conical surface encloses an angle ⁇ with a plane extending perpendicularly to the longitudinal direction, which angle is about 5°. Together with the conical abutting faces 15, 16, this angle provides a centering of the two coupling parts 1, 2 relative to each other in the coupled condition.
  • the castings are withdrawable, so that they can easily be removed from the mold.
  • the stub 6 may be provided with three or more bayonet cross protrusions 7.
  • the kinematic reversal of the two coupling parts is possible, with two bayonet ring segments being provided on the stub 6 and two internally directed cross protrusions being provided in the stub-receiving recess 9 of the female part 2.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)

Claims (10)

  1. Pièce de raccordement de tubes d'échafaudage pour relier deux tubes d'échafaudage (T) en direction longitudinale, comportant une partie de couplage femelle et une partie de couplage mâle (respectivement 1 et 2) qui sont chacune, par une extrémité de liaison propre (3, 4), reliées de façon fixe à une extrémité de tube d'échafaudage (T), le diamètre externe maximal des pièces de couplage (1, 2) correspondant au diamètre externe des tubes d'échafaudage (T) à relier, dans laquelle, à une extrémité libre (5) distante de l'extrémité de liaison (3), la partie de couplage mâle (1) comprend un embout ayant des dimensions transversales externes inférieures au diamètre interne des tubes d'échafaudage (T), l'embout (6) comprenant au moins deux appendices transversaux en baïonnette (7) réparties de façon régulière sur la circonférence de l'embout (6), dans laquelle à une extrémité libre (8) distante de l'extrémité de liaison (4), la partie de couplage femelle comprend une cavité de réception de l'embout (9) limitée, à ladite extrémité libre (8), par un anneau à baïonnette (10) comportant au moins deux cavités (11) pour y mettre les appendices transversaux en baïonnette (7) lorsque la partie de couplage mâle (1) se trouve dans une position d'insertion par rapport à la partie de couplage femelle (2), dans laquelle la cavité de réception de l'embout (9) présente des dimensions transversales internes telles que l'embout (6) peut y être reçu de façon ajustée, dans laquelle, à l'extrémité de l'anneau à baïonnette (10) distante de l'extrémité libre (8), la cavité de réception d'embout (9) comprend une partie de réception d'appendice transversal (12) présentant des dimensions transversales internes plus grandes que la cavité de réception d'embout (9), de sorte que la partie de couplage mâle (1) peut tourner pour passer de la position d'insertion par rapport à la partie de couplage femelle (2) à une position couplée dans laquelle les parties de couplage mâle et femelle (1, 2) sont reliées, dans laquelle chaque segment d'anneau à baïonnette (10, 10') situé entre deux cavités (11) comporte une face de course d'anneau à baïonnette (13) qui, en vue selon la direction de rotation de la partie de couplage mâle (1) à suivre par rapport à la partie de couplage femelle (2) pendant l'opération de couplage, couvre un angle d'inclinaison α par rapport à un plan s'étendant perpendiculairement à l'axe longitudinal de la partie de couplage femelle (2), dans laquelle, sur un côté en regard de l'extrémité de liaison (3), chaque appendice transversal (7) comprend une face de course d'appendice transversal (14) qui, en vue selon la direction de rotation de la partie de couplage mâle (1) à suivre par rapport à la partie femelle (2) pendant l'opération de couplage, couvre un angle d'inclinaison β par rapport à un plan s'étendant perpendiculairement à l'axe longitudinal de la partie de couplage mâle (1), dans laquelle, à l'extrémité libre (4), la partie de couplage femelle (2) comprend une face de butée (15) qui, dans la position couplée des parties de couplage mâle et femelle (1, 2) et sous l'effet des faces de course (respectivement 14 et 13) des appendices transversaux de baïonnette (7) et des segments d'anneau à baïonnette (10) dans une zone de contact (15a, 16a) bute contre une face de butée (16) sur la partie de couplage mâle (1), dans laquelle les angles d'inclinaison α et β sont suffisamment faibles pour établir une liaison auto-bloquante entre les parties de couplage mâle et femelle (1, 2) dans la position couplée, caractérisée par le fait que la zone de contact (15a, 16a) entre la face de butée (16) de la partie de couplage mâle (1) et la face de butée (15) de la partie de couplage femelle (2) est une zone sensiblement annulaire (15a, 16a) s'étendant de façon adjacente à la circonférence externe des parties de couplage mâle et femelle (1, 2), la face de butée (16) de la partie de couplage mâle (1) ayant une configuration tronc-conique, dans laquelle l'axe de la dite face de butée conique (16) coïncide avec l'axe longitudinal de la partie de couplage mâle (1), dans laquelle la face de butée conique (16) couvre un angle γ par rapport à un plan s'étendant perpendiculairement à l'axe longitudinal de la partie de couplage mâle (1), dans laquelle la face de butée (15) de la partie de couplage femelle (2) présente une configuration tronc-conique, dans laquelle l'axe de la dite face de butée conique (15) coïncide avec l'axe longitudinal de la partie de couplage femelle (2), dans laquelle la face de butée conique (15) couvre un angle δ par rapport à un plan s'étendant perpendiculairement à l'axe longitudinal de la partie femelle (2), dans laquelle l'angle γ est inférieur à l'angle δ.
  2. Pièce de raccordement de tubes d'échafaudage selon la revendication 1, caractérisée par le fait que l'angle α et l'angle β sont inférieurs à 7 degrés.
  3. Pièce de raccordement de tubes d'échafaudage selon la revendication 2, caractérisée par le fait que l'angle α et l'angle β sont d'environ 4 degrés.
  4. Pièce de raccordement de tubes d'échafaudage selon l'une quelconque des revendications 1 à 3, caractérisée par le fait. que l'angle γ présente une grandeur d'environ 15 degrés et l'angle δ présente une grandeur d'environ 20 degrés.
  5. Pièce de raccordement de tubes d'échafaudage selon l'une quelconque des revendications précédentes, caractérisée par le fait que l'extrémité de liaison (3, 4) de chacune des parties de couplage mâle et femelle (1, 2) est formée par une partie cylindrique (respectivement 17 et 18) présentant un diamètre externe apte à être reçu de façon ajustée dans le tube pour échafaudage associé (T).
  6. Pièce de raccordement de tubes d'échafaudage selon la revendication 5, caractérisée par le fait que la surface de la partie cylindrique (17, 18) formant l'extrémité de liaison (3, 4) comporte un certain nombre de cavités (19), dans laquelle, après que la partie cylindrique a été logée dans l'extrémité de tube d'échafaudage (T), la surface de tube d'échafaudage est pressée, par déformation plastique locale, pour entrer dans les cavités (19) pour former la liaison fixe entre le tube d'échafaudage (T) et la partie de couplage (1, 2).
  7. Pièce de raccordement de tubes d'échafaudage selon l'une quelconque des revendications précédentes, caractérisée par le fait que les parties de couplage (1, 2) sont fabriquées par coulage.
  8. Pièce de raccordement de tubes d'échafaudage selon l'une quelconque des revendications précédentes, caractérisée par le fait que chaque partie de couplage, mâle et femelle, (1, 2) comporte des marquages (20, 21) indiquant si les deux parties de couplage (1, 2) dans la position couplée ont été tournées l'une par rapport à l'autre de façon insuffisante, suffisante ou, au contraire, excessivement.
  9. Pièce de raccordement de tubes d'échafaudage selon la revendication 8, caractérisée par le fait que les marquages (20, 21) sont formés de deux encoches (20) sur la partie de couplage femelle (2) et une encoche (21) sur la partie de couplage mâle (1) ou vice versa.
  10. Tube d'échafaudage (T) comportant, à l'une de ses extrémités, une partie de couplage mâle (1) d'une pièce de raccordement de tubes d'échafaudage selon l'une quelconque des revendications précédentes, et comportant, à son autre extrémité, une partie de couplage femelle (2) d'une pièce de raccordement de tubes d'échafaudage selon l'une quelconque des revendications précédentes.
EP97203120A 1996-10-09 1997-10-08 Raccord pour tube d'échafaudage comportant des parties de raccord mâle et femelle et tube d'échafaudage Expired - Lifetime EP0835970B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1004234 1996-10-09
NL1004234A NL1004234C2 (nl) 1996-10-09 1996-10-09 Steigerbuisverbindingsstuk voorzien van een mannelijk en een vrouwelijk koppeldeel en een steigerbuis.

Publications (2)

Publication Number Publication Date
EP0835970A1 EP0835970A1 (fr) 1998-04-15
EP0835970B1 true EP0835970B1 (fr) 2003-05-28

Family

ID=19763648

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97203120A Expired - Lifetime EP0835970B1 (fr) 1996-10-09 1997-10-08 Raccord pour tube d'échafaudage comportant des parties de raccord mâle et femelle et tube d'échafaudage

Country Status (4)

Country Link
EP (1) EP0835970B1 (fr)
AT (1) ATE241742T1 (fr)
DE (1) DE69722342D1 (fr)
NL (1) NL1004234C2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201116943D0 (en) * 2011-10-03 2011-11-16 Benchmark Scaffolding Ltd Tube joiner
CN104358403A (zh) * 2014-10-29 2015-02-18 无锡市安捷脚手架有限公司 一种卡接式脚手架卡接组件
CN104533075A (zh) * 2014-10-29 2015-04-22 无锡市安捷脚手架有限公司 一种带有加强筋的卡接式脚手架卡接组件
GB2572629A (en) * 2018-04-05 2019-10-09 Mcgrath Donald System scaffold standard and system scaffold assembly comprising the same
GB202014474D0 (en) * 2020-09-15 2020-10-28 Dunbar Lee A hybrid scaffolding system and couplings and method of scaffolding

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1762572A (en) * 1928-08-28 1930-06-10 American Safety Device Co Coupling device
FR895091A (fr) * 1942-03-26 1945-01-15 Joint axial pour accouplement de tubes, dans les constructions métalliques tubulaires rapides
GB1006952A (en) * 1965-11-18 1965-10-06 Rapid Metal Developments Ltd Improvements in or relating to joints for tubes and pipes
FR2449763A1 (fr) * 1979-02-22 1980-09-19 Self Lock Echafaudages Dispositif d'accouplement pour montants et autres pieces tubulaires d'echafaudage
US4619549A (en) * 1984-11-13 1986-10-28 Builders Equipment And Tool Manufacturing Company Scaffolding connection apparatus and method

Also Published As

Publication number Publication date
ATE241742T1 (de) 2003-06-15
NL1004234C2 (nl) 1998-04-10
EP0835970A1 (fr) 1998-04-15
DE69722342D1 (de) 2003-07-03

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