EP1997972B1 - An improved mechanism for the connection of a pipe to a node of a three-dimensional structure - Google Patents
An improved mechanism for the connection of a pipe to a node of a three-dimensional structure Download PDFInfo
- Publication number
- EP1997972B1 EP1997972B1 EP20080386009 EP08386009A EP1997972B1 EP 1997972 B1 EP1997972 B1 EP 1997972B1 EP 20080386009 EP20080386009 EP 20080386009 EP 08386009 A EP08386009 A EP 08386009A EP 1997972 B1 EP1997972 B1 EP 1997972B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bolt
- sleeve
- conical end
- pin
- bearing surface
- 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.)
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B1/1903—Connecting nodes specially adapted therefor
- E04B1/1906—Connecting nodes specially adapted therefor with central spherical, semispherical or polyhedral connecting element
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B2001/1924—Struts specially adapted therefor
- E04B2001/1927—Struts specially adapted therefor of essentially circular cross section
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B2001/1957—Details of connections between nodes and struts
- E04B2001/196—Screw connections with axis parallel to the main axis of the strut
Definitions
- the present disclosure relates to an improved mechanism having the features of the preamble of claim 1.
- Mechanisms of this type are well known. They are useful for the construction of space frames of any structural form, e.g. for buildings.
- the main advantage of mechanisms of this type is that there are no openings through the walls of the structural components of the tubular framework members, e.g. relatively large openings through the walls of the conical end, for the insertion of the bolts, and longitudinal slotted holes through the walls of the sleeve, for the passing through of the pin and for the longitudinal movement of the bolt with the pin with respect to the sleeve, as is shown in Figures 1 , 2 , 3 and 5 of document DE 901955 .
- the longitudinal slotted holes through the walls of the sleeve reduce the ultimate compression resistance of the sleeve. In this case, it is possible to have premature failure of the sleeve due to plastic buckling.
- the longitudinal slotted holes through the walls of the sleeve expose the most highly stressed portion of the bolt to the environment; thus it is possible for dust and water to collect between the bolt and the walls of the sleeve.
- the presence of specific chemical compounds in the environment e.g. aqueous electrolytes, particularly when containing H 2 S, may induce cracking of the bolt.
- This cracking stress-corrosion cracking
- Document GR 1004166 discloses a mechanism which comprises the features of the preamble of claim 1; and document EP 0557235 B1 discloses a mechanism comprising features contained in the preamble of claim 1.
- Incomplete (i.e. less than the required) length of engagement in the threaded assembly is likely to happen under the following possible conditions: when the length of the internal thread of the node connector has been manufactured to a length shorter than the required length of engagement, when there is a manufacturing error, or damage, in the internal thread of the node connector or in the external thread of the bolt, or when the erection worker has not fully screwed the bolt into the threaded hole of the node connector. If this occurs in the assembled space frame, the corresponding mechanism cannot carry tension; and, when the space frame is loaded, the redistribution of internal forces may overload neighboring tubular framework members.
- the bolt with the pin If failure of the threaded assembly should occur, it is preferable for the bolt with the pin to break rather than to have either the external or internal thread stripped; and the length of engagement of mating threads should be sufficient to carry the full load necessary to break the bolt without the threads stripping. This length determines the required length of engagement to prevent stripping of either the external or internal thread in mechanisms of this type.
- Another object is to provide an improved mechanism which solves the connection problem of the pipe in a simple, economical and aesthetic manner; and this with a minimum number of different components.
- Still another object is to provide an improved mechanism with increased structural reliability.
- the structure according to Figure 1 is called a three-dimensional structure or space frame and comprises the node connectors 1 and the tubular framework members 30.
- the three-dimensional structure according to Figure 1 is useful for the construction of wide span roofs in buildings, such as exhibition pavilions, airport halls, covered sports facilities, shopping centers, training centers, museums, etc.
- the node connectors 1 are spherical, with partial flat bearing surfaces 11, distributed on their outer surface, having radial threaded holes 10.
- Each tubular framework member 30 comprises one metal pipe 9 and two improved mechanisms 12, fixed to the ends of the metal pipe 9, which connect the ends of the metal pipe 9 to the node connectors 1.
- Each improved mechanism 12 comprises a bolt 8, a pin 4, a sleeve 3, a socket set screw 2 and a conical end 7.
- the bolt 8 has a hole for the passing through of the pin 4 and a radial groove 18, preferably cylindrical with a bottom which has the form of a spherical cap.
- the axis 5 of the radial groove 18 is perpendicular to the longitudinal axis 15 of the bolt 8; and is in the same plane with the longitudinal axis 15 of the bolt 8.
- the sleeve 3 has a front bearing surface 23, a rear bearing surface 13, a longitudinal hole for the passing through of the bolt 8, two opposite longitudinal grooves 14, on the walls of the longitudinal hole, where the ends of the pin 4 move, and a radial threaded hole 20 of small diameter, which has the same circumferential position with either one of the two opposite longitudinal grooves 14, the axis 6 of which is approximately perpendicular to the longitudinal axis 15 of the bolt 8 and is in the same plane with the longitudinal axis 15 of the bolt 8.
- the small diameter radial threaded hole 20 is very close to the rear bearing surface 13 of the sleeve 3.
- the socket set screw 2 is screwed through the radial threaded hole 20.
- the conical end 7 has a longitudinal hole 17 for the passing through of the bolt 8 and is welded to the pipe 9 with a circumferential weld 16 which has preferably been ground.
- the bolt 8, the sleeve 3, the conical end 7 and the pipe 9 have a common longitudinal axis 15.
- This common longitudinal axis 15 is the longitudinal axis of the tubular framework member 30.
- the axis 5 of the radial groove 18 and the axis 6 of the radial threaded hole 20 are configured to have the same circumferential position, and the same longitudinal position exactly when the bolt 8 is fully screwed and the bolt head 19 is in contact with the rear bearing surface 29 of the conical end 7, as is shown in Figure 3 .
- the bolt head 19 is in contact with the internal end 29 of tubular framework member 30.
- the front bearing surface 28 of the conical end 7 is in contact with the rear bearing surface 13 of the sleeve 3 and the front bearing surface 23 of the sleeve 3 is in contact with the flat bearing surface 11 of the node connector 1 of the space frame.
- Figure 4 also shows another embodiment of the improved mechanism 12 according to the present invention, in which the sleeve 3 is configured so that, when the bolt 8 is at its rearmost position with respect to the conical end 7, and the rear bearing surface 13 of the sleeve 3 is in contact with the conical end 7, the front end 22 of the bolt 8 is flush with the front bearing surface 23 of the sleeve 3.
- This embodiment allows for the replacement of the tubular framework member 30, e.g. in case of damage or assembly error during erection, when the tubular framework member 30 is located between two node connectors 1 which have constant distance in space, i.e. their relative positions in space with respect to time remain constant, provided that the tubular framework member 30 has not been loaded.
- pipe 9 In order to assemble the tubular framework member 30 between two node connectors 1 of constant distance, pipe 9 has a relatively small - with respect to the diameter of the pipe 9 - opening 26 so that by using a suitable tool, e.g. a long, and of small size, Allen wrench, a gentle force can be applied to the head of the bolt 8, so that the front end 22 of the bolt 8 comes into contact with the threaded hole 10 of the node connector 1 for the start of the bolt screwing. After the assembly of the space frame, the relatively small opening 26 is sealed using a plug 27 or by any other appropriate manner.
- a suitable tool e.g. a long, and of small size, Allen wrench
- the improved mechanism of Figure 4 is useful for the construction of space frames of any structural form, e.g. cylindrical, spherical or free-form.
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Joining Of Building Structures In Genera (AREA)
Description
- The present disclosure relates to an improved mechanism having the features of the preamble of
claim 1. - Mechanisms of this type are well known. They are useful for the construction of space frames of any structural form, e.g. for buildings.
- The main advantage of mechanisms of this type is that there are no openings through the walls of the structural components of the tubular framework members, e.g. relatively large openings through the walls of the conical end, for the insertion of the bolts, and longitudinal slotted holes through the walls of the sleeve, for the passing through of the pin and for the longitudinal movement of the bolt with the pin with respect to the sleeve, as is shown in
Figures 1 ,2 ,3 and 5 of documentDE 901955 . - In addition to the aesthetic problems, the above mentioned openings through the walls of the structural components of the tubular framework members create structural safety problems, as will be illustrated hereinafter.
- In practice, a relatively large opening is made on the pipe portion of the tubular framework member for the insertion of the bolts, which reduces both the ultimate tension and the ultimate compression resistance of the pipe. In the case of compression, it is possible to have failure of the pipe due to asymmetrical local elastic-plastic buckling of the walls of the pipe ("asymmetrical" because of the fact that only one opening is provided, although
claim 2 of documentDE 901955 recommends symmetrical - with respect to the longitudinal axis of the tubular framework member - openings). - Furthermore, the longitudinal slotted holes through the walls of the sleeve, as in
Figures 1 and2 of documentDE 901955 , reduce the ultimate compression resistance of the sleeve. In this case, it is possible to have premature failure of the sleeve due to plastic buckling. - In addition to the above mentioned strength problem of the sleeve, the longitudinal slotted holes through the walls of the sleeve expose the most highly stressed portion of the bolt to the environment; thus it is possible for dust and water to collect between the bolt and the walls of the sleeve. In this case, the presence of specific chemical compounds in the environment, e.g. aqueous electrolytes, particularly when containing H2S, may induce cracking of the bolt. This cracking (stress-corrosion cracking) may take the form of a relatively slow, stable crack extension or, as is often the case, an unpredictable catastrophic fracture. It is thus necessary to effectively protect the bolt with the pin against corrosion.
- For many years, it has been the usual practice to protect the bolt with the pin against corrosion with electroplated coatings. Since, however, bolts are now made of high-strength steels, e.g. of property class 10.9, electroplating - including pickling for scale and rust removal - increases the probability for a hydrogen-induced fracture of the bolt (hydrogen embrittlement). Hydrogen embrittlement can cause dangerous and sometimes catastrophic failures, if it occurs in critical tubular framework members, particularly in wide-span roof structures. The probability of encountering hydrogen embrittlement can be reduced by using lower-strength steels, by limiting immersion times in acid or plating baths, and by in-process (intermediate) baking. According to International Standard ISO 4042:1999(E) "Fasteners - Electroplated coatings", page 3: "In cases of parts with high tensile strength or hardness or which have been surface hardened, which have absorbed hydrogen and are under tensile stress there is the risk of failure due to hydrogen embrittlement"; and, page 4: "Complete elimination of hydrogen embrittlement cannot be assured. If a reduced probability of encountering hydrogen embrittlement is desired, alternative procedures should be evaluated".
- Document
GR 1004166 claim 1; and documentEP 0557235 B1 discloses a mechanism comprising features contained in the preamble ofclaim 1. - Notwithstanding the many advantages of mechanisms of this type, the problem of the confirmation - that the bolt is completely screwed into the threaded hole of the node connector - still needs to be solved.
- Incomplete (i.e. less than the required) length of engagement in the threaded assembly is likely to happen under the following possible conditions: when the length of the internal thread of the node connector has been manufactured to a length shorter than the required length of engagement, when there is a manufacturing error, or damage, in the internal thread of the node connector or in the external thread of the bolt, or when the erection worker has not fully screwed the bolt into the threaded hole of the node connector. If this occurs in the assembled space frame, the corresponding mechanism cannot carry tension; and, when the space frame is loaded, the redistribution of internal forces may overload neighboring tubular framework members.
- If failure of the threaded assembly should occur, it is preferable for the bolt with the pin to break rather than to have either the external or internal thread stripped; and the length of engagement of mating threads should be sufficient to carry the full load necessary to break the bolt without the threads stripping. This length determines the required length of engagement to prevent stripping of either the external or internal thread in mechanisms of this type.
- It is an object of the present invention to provide a solution to the problem of the confirmation that the bolt with the pin is completely screwed into the threaded hole of the node connector; and, as a consequence, that the corresponding mechanism in the assembled space frame can carry tension as well as compression.
- Another object is to provide an improved mechanism which solves the connection problem of the pipe in a simple, economical and aesthetic manner; and this with a minimum number of different components.
- Still another object is to provide an improved mechanism with increased structural reliability.
- These objects are achieved by an improved mechanism having the features of the characterizing part of
claim 1. - By rotating the sleeve, a torque is transmitted to the bolt through the pin, thus screwing the bolt into the node connector. When the bolt is fully screwed, the sleeve is in contact with both the node connector and the conical end. By applying an appropriate torque to the sleeve, the bolt with the pin tightens the node connector and the conical end on the sleeve, the bolt head being in contact with the rear bearing surface of the conical end. Next, the socket set screw is fully screwed. If the rear end of the socket set screw is at least flush with the outermost peripheral surface of the sleeve, this confirms that the bolt with the pin is completely screwed into the threaded hole of the node connector. In the assembled three-dimensional structure, tension from the pipe to the node connector, and conversely, is transmitted through the bolt; compression is transmitted through the sleeve.
- Some advantages of the present invention are:
- it provides a simple, economical and aesthetic solution to the connection problem of the pipe, and this with a minimum number of different components;
- the resulting connection assembly is "closed", i.e. there are no openings through the walls of the tubular framework members, according to the valid corrosion protection standards, e.g. DIN 55928;
- the required engagement of the bolt thread into the node connector can be confirmed by visual inspection and/or by touch;
- it can be used in the realization of three-dimensional structures of any structural form, e.g. flat, cylindrical, spherical or free-form;
- the length of engagement of mating threads can be long, which assists in the realization of connections of pipes to nodes made of lower-strength material, e.g. aluminum or engineering plastic;
- due to the increased structural reliability of the connection, it is possible to realize wide span three-dimensional structures having spans wider than the spans which can be realized with the mechanisms according to the prior art.
- The invention will be further described, by way of example only, with reference to the accompanying drawings wherein like elements are numbered alike in the several Figures:
-
Figure 1 shows part of a three-dimensional structure with node connectors and pipes, wherein the improved mechanism according to the present invention is used. -
Figure 2 shows one longitudinal section and two cross-sections of the improved mechanism according to the present invention just before the start of the bolt screwing. -
Figure 3 shows one longitudinal section and two cross-sections of the improved mechanism according to the present invention after the bolt and the socket set screw have been screwed. -
Figure 4 shows one longitudinal section and two cross-sections of the improved mechanism according to the present invention, where the bolt is at the rearmost position with respect to the conical end of the pipe. - Hereinafter, the best mode for carrying out the present invention is described in detail.
- The structure according to
Figure 1 is called a three-dimensional structure or space frame and comprises thenode connectors 1 and thetubular framework members 30. - The three-dimensional structure according to
Figure 1 is useful for the construction of wide span roofs in buildings, such as exhibition pavilions, airport halls, covered sports facilities, shopping centers, training centers, museums, etc. - The
node connectors 1 are spherical, with partial flat bearingsurfaces 11, distributed on their outer surface, having radial threadedholes 10. - Each
tubular framework member 30 comprises onemetal pipe 9 and two improvedmechanisms 12, fixed to the ends of themetal pipe 9, which connect the ends of themetal pipe 9 to thenode connectors 1. - Each improved
mechanism 12 comprises abolt 8, apin 4, asleeve 3, a socket setscrew 2 and aconical end 7. - The
bolt 8 has a hole for the passing through of thepin 4 and aradial groove 18, preferably cylindrical with a bottom which has the form of a spherical cap. Theaxis 5 of theradial groove 18 is perpendicular to thelongitudinal axis 15 of thebolt 8; and is in the same plane with thelongitudinal axis 15 of thebolt 8. - The
sleeve 3 has a front bearingsurface 23, arear bearing surface 13, a longitudinal hole for the passing through of thebolt 8, two oppositelongitudinal grooves 14, on the walls of the longitudinal hole, where the ends of thepin 4 move, and a radial threadedhole 20 of small diameter, which has the same circumferential position with either one of the two oppositelongitudinal grooves 14, theaxis 6 of which is approximately perpendicular to thelongitudinal axis 15 of thebolt 8 and is in the same plane with thelongitudinal axis 15 of thebolt 8. The small diameter radial threadedhole 20 is very close to the rear bearingsurface 13 of thesleeve 3. - The socket set
screw 2 is screwed through the radial threadedhole 20. - The
conical end 7 has alongitudinal hole 17 for the passing through of thebolt 8 and is welded to thepipe 9 with acircumferential weld 16 which has preferably been ground. - The
bolt 8, thesleeve 3, theconical end 7 and thepipe 9 have a commonlongitudinal axis 15. This commonlongitudinal axis 15 is the longitudinal axis of thetubular framework member 30. - The
axis 5 of theradial groove 18 and theaxis 6 of the radial threadedhole 20 are configured to have the same circumferential position, and the same longitudinal position exactly when thebolt 8 is fully screwed and thebolt head 19 is in contact with therear bearing surface 29 of theconical end 7, as is shown inFigure 3 . - When the
bolt 8 is at the rearmost position, as shown inFigure 2 , thepin 4 is in contact with thesocket set screw 2, part of which is in thelongitudinal groove 14 of thesleeve 3. At the moment the pin comes in contact with the socket set screw, the end of thebolt 22 of theimproved mechanism 12 projects several millimeters off thefront bearing surface 23 of thesleeve 3. By pushing thebolt 8 on the threadedhole 10 of thenode connector 1 of the three dimensional structure and by rotating thesleeve 3, thebolt 8 is screwed and at the same time the ends of thepin 4 move in the two oppositelongitudinal grooves 14 of thesleeve 3. - Just before the
bolt 8 reaches the most forward position of its relative movement with respect to theconical end 7, as is shown inFigure 3 , thebolt head 19 is in contact with theinternal end 29 oftubular framework member 30. At the same time, thefront bearing surface 28 of theconical end 7 is in contact with therear bearing surface 13 of thesleeve 3 and thefront bearing surface 23 of thesleeve 3 is in contact with theflat bearing surface 11 of thenode connector 1 of the space frame. By applying an appropriate torque to thesleeve 3, e.g. using a wrench, this torque is transmitted to thebolt 8 through thepin 4, and theconical end 7 and thenode connector 1 are tightened on thesleeve 3. Next, thesocket set screw 2 is fully screwed. - If the
rear end 24 of thesocket set screw 2, after it has been fully screwed, projects outwardly from the outermostperipheral surface 25 of the sleeve3, as is shown in the longitudinal section and in the section B-B ofFigure 2 , this means that thebolt 8 is not fully screwed into thenode connector 1. - The maximum relative displacement of the
bolt 8 of theimproved mechanism 12, with respect to theconical end 7, is restrained by the contact of thepin 4 on thefront bearing surface 28 of theconical end 7, when thesocket set screw 2 does not project into thelongitudinal groove 14 of thesleeve 3, as shown in the longitudinal section and in the section B-B ofFigure 4 . - Towards the opposite direction, as is shown in
Figure 3 , this maximum relative displacement is restrained by the bearing of thehead 19 of thebolt 8 on theinternal end 29 of thetubular framework member 30. -
Figure 4 also shows another embodiment of theimproved mechanism 12 according to the present invention, in which thesleeve 3 is configured so that, when thebolt 8 is at its rearmost position with respect to theconical end 7, and therear bearing surface 13 of thesleeve 3 is in contact with theconical end 7, thefront end 22 of thebolt 8 is flush with thefront bearing surface 23 of thesleeve 3. This embodiment allows for the replacement of thetubular framework member 30, e.g. in case of damage or assembly error during erection, when thetubular framework member 30 is located between twonode connectors 1 which have constant distance in space, i.e. their relative positions in space with respect to time remain constant, provided that thetubular framework member 30 has not been loaded. In order to assemble thetubular framework member 30 between twonode connectors 1 of constant distance,pipe 9 has a relatively small - with respect to the diameter of the pipe 9 -opening 26 so that by using a suitable tool, e.g. a long, and of small size, Allen wrench, a gentle force can be applied to the head of thebolt 8, so that thefront end 22 of thebolt 8 comes into contact with the threadedhole 10 of thenode connector 1 for the start of the bolt screwing. After the assembly of the space frame, the relativelysmall opening 26 is sealed using aplug 27 or by any other appropriate manner. - In areas with low temperatures and when it is possible for water to collect within the tubular framework member 30 (e.g. during temporary storage before erection), repeated freezing can lead to rupture of the wall of the
pipe 9 through successive expansion and contraction until the elongation limit is reached. In order to prevent this phenomenon, thesmall opening 26 at the end of thepipe 9 is placed at the lowest relative elevation during the assembly of the space frame and is sealed using aplug 27 after the construction of the roof cladding. - The improved mechanism of
Figure 4 is useful for the construction of space frames of any structural form, e.g. cylindrical, spherical or free-form.
Claims (8)
- An improved mechanism (12) for the connection of a pipe (9) to a node connector (1) of a three dimensional structure comprising:- a bolt (8) with a pin (4), said bolt (8) having a hole for the passing through of said pin (4);- a sleeve (3) configured to rotate said pin (4), said sleeve (3) having a radial threaded hole (20) and just two opposite longitudinal grooves (14) where the ends of said pin (4) move, said radial threaded hole (20) having the same circumferential position with either one of said just two opposite longitudinal grooves (14);- a socket set screw (2) screwed through said radial threaded hole (20);- a conical end (7) fixed to said pipe (9), said conical end (7) having a longitudinal hole (17) for the passing through of said bolt (8);characterized in that:- said bolt (8) has a radial groove (18) between said hole for the passing through of said pin (4) and the bolt head (19), said radial groove (18) formed by volume subtraction of a solid from the volume of said bolt (8), said solid comprising a solid of revolution; and- said radial groove (18) and said radial threaded hole (20) have the same circumferential position; and the same longitudinal position exactly when said sleeve (3) is in contact with the front bearing surface (28) of said conical end (7), and said bolt head (19) is in contact with the rear bearing surface (29) of said conical end (7).
- An improved mechanism (12) according to claim 1, characterized in that said solid further comprises a spherical cap.
- An improved mechanism (12) according to claim 1, characterized in that the rear end (24) of said socket set screw (2) is at least flush with the outermost peripheral surface (25) of said sleeve (3), when the front end (21) of said socket set screw (2) is inserted into said radial groove (18), said front end (21) of said socket set screw (2) reaching the bottom of said radial groove (18).
- An improved mechanism (12) according to claim 1, characterized in that the longitudinal displacement of said bolt (8) with respect to said conical end (7) is restrained:- by the contact of said pin (4) on said socket set screw (2), the front end (21) of said socket set screw (2) projecting into said longitudinal groove (14), and said sleeve (3) being in contact with said front bearing surface (28) of said conical end (7); and, towards the opposite direction,- by the bearing of said bolt head (19) on said rear bearing surface (29) of said conical end (7).
- An improved mechanism (12) according to claim 1, characterized in that the maximum longitudinal displacement of said bolt (8) with respect to said conical end (7) is restrained:- by the contact of said pin (4) on said front bearing surface (28) of said conical end (7), the front end of (21) of said socket set screw (2) not projecting into said longitudinal groove (14); and, towards the opposite direction,- by the bearing of said bolt head (19) on said rear bearing surface (29) of said conical end (7).
- An improved mechanism (12) according to claim 1, characterized in that the front end (22) of said bolt (8) is flush with the front bearing surface (23) of said sleeve (3), when said pin (4) is in contact with said front bearing surface (28) of said conical end (7), said sleeve (3) being in contact with said front bearing surface (28) of said conical end (7).
- An improved mechanism (12) according to claim 1, characterized in that said pipe (9) has at least one radial hole (26).
- An improved mechanism (12) according to claim 7, further comprising a sealing means (27) for said at least one radial hole (26).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GR20070100661A GR1005940B (en) | 2007-05-29 | 2007-05-29 | Mechanism for the connection of a pipe to a node of a three-dimensional structure. |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1997972A2 EP1997972A2 (en) | 2008-12-03 |
EP1997972A3 EP1997972A3 (en) | 2010-07-21 |
EP1997972B1 true EP1997972B1 (en) | 2012-12-26 |
Family
ID=39597318
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20080386009 Active EP1997972B1 (en) | 2007-05-29 | 2008-05-27 | An improved mechanism for the connection of a pipe to a node of a three-dimensional structure |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1997972B1 (en) |
GR (1) | GR1005940B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110318461B (en) * | 2019-06-24 | 2024-04-12 | 太原理工大学 | Bolt drum-shaped spherical shell node for supporting and connecting round steel pipe |
CN110318470A (en) * | 2019-07-24 | 2019-10-11 | 上海联创设计集团股份有限公司 | Bolted spherical node plate bearing |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE901955C (en) | 1950-07-23 | 1954-06-14 | Mengeringhausen Max | Component for trusses, in particular scaffolding made of steel pipes, with coupling device |
GB2240605B (en) * | 1990-01-31 | 1993-07-28 | Yoshida Kogyo Kk | Three dimensional frame structure |
GR1001160B (en) | 1992-02-20 | 1993-05-24 | Georgios Gkamanis | Mechanism for the connection of a pipe to a node of a three-dimensional structure. |
GR1004166B (en) | 2002-03-11 | 2003-02-26 | Γεωργιος Αχιλλεα Γκαμανης | Mechanism for the connection of a pipe to a node of a three-dimensional structure. |
-
2007
- 2007-05-29 GR GR20070100661A patent/GR1005940B/en active IP Right Grant
-
2008
- 2008-05-27 EP EP20080386009 patent/EP1997972B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP1997972A3 (en) | 2010-07-21 |
GR1005940B (en) | 2008-06-09 |
EP1997972A2 (en) | 2008-12-03 |
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