EP0001342B1 - Improvements in girder fittings - Google Patents
Improvements in girder fittings Download PDFInfo
- Publication number
- EP0001342B1 EP0001342B1 EP78300376A EP78300376A EP0001342B1 EP 0001342 B1 EP0001342 B1 EP 0001342B1 EP 78300376 A EP78300376 A EP 78300376A EP 78300376 A EP78300376 A EP 78300376A EP 0001342 B1 EP0001342 B1 EP 0001342B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- main body
- clamp
- screw
- fitting
- scaffold tube
- 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
Links
Images
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
- E04G3/00—Scaffolds essentially supported by building constructions, e.g. adjustable in height
- E04G3/22—Scaffolds essentially supported by building constructions, e.g. adjustable in height supported by roofs or ceilings
-
- 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
- E04G3/00—Scaffolds essentially supported by building constructions, e.g. adjustable in height
- E04G3/28—Mobile scaffolds; Scaffolds with mobile platforms
-
- 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
- E04G5/00—Component parts or accessories for scaffolds
- E04G5/04—Means for fastening, supporting, or bracing scaffolds on or against building constructions
- E04G5/045—Means for fastening, supporting, or bracing scaffolds on or against building constructions for fastening scaffoldings on profiles, e.g. I or H profiles
Definitions
- This invention relates to the attachment of scaffolding platforms, workmen's platforms or cradles and the like to flanged girders of steel or like material and is particularly concerned with fittings for securing scaffolding to such girders.
- the present invention aims to provide a fitting which can be used to clamp a scaffold tube to a flanged girder, the scaffold tube forming part of a workmen's platform or cradle whereby said platform can be secured directly to the girder.
- US-A-2,165,221 discloses a fitting adapted to be secured to a horizontal length of scaffold tube for clamping said scaffold tube to the horizontal flange of a flanged girder, said fitting comprising a main body, a clamp pivotally mounted on the lower portion of the main body, said clamp and main body being so shaped as to co-operatively receive and clamp between them said length of scaffold tube, fastening means for releasably securing the clamp to the main body, and a screw arranged to engage the surface of said girder flange to clamp the main body to the girder, whereby, in use, the main body and clamp are secured to the scaffold tube at a position adjacent to an edge portion of the girder flange, a part of the main body overlying the upper surface of horizontal flange of the flanged girder and the main body being clamped to the girder flange by the screw engaging the surface of said flange.
- This prior arrangement provides a coupler for two scaffold tubes which is intended to be placed against a girder for rigidity purposes for the fitting itself and is not designed for use as the main weight bearing device for constructing a drop scaffold tube used in the construction of a workmen's platform or cradle.
- This prior fitting has a boss which is designed to take a latch securing bolt but is not intended to seat on the horizontal flange of a girder. If the bolt were to shear, the latch jaw would be released and the scaffold tube held therein could jump out. Furthermore, the small area of the boss which would drop onto the girder flange in the event of bolt failure would be insufficient to maintain the scaffold in place particularly if the scaffold tube had worked loose or fallen down as a result of failure of the bolt. The fitting is therefore totally unsuitable for use in constructing workmen's cradles or platforms.
- the primary aim of this invention is to provide a fitting which can be used with complete safety to construct a workmen's cradle or platform by securely clamping a scaffold tube forming part of the cradle or platform directly to a flanged girder.
- the present invention is characterized in that the major length of the main body extends, in use, in the vertical direction, the fastening means is substantially horizontally disposed when the fitting is in use, the part of the main body extends, at a position remote from the pivotal connection of the clamp, in a direction substantially at right angles to the major length of the main body, and the said main body has at its lower end a portion which is provided with an arcuate recess to receive and engage the scaffold tube such that the vertical load of the scaffold tube is borne substantially entirely by the main body, the fastening means being only subjected to horizontal loads from the fitting being clamped onto the scaffold tube.
- the fitting 10 comprises a main body 1 having, adjacent one end, an arcuate recess 2 and on which one end of a latch or clamp 4 is pivotally mounted by means of a rivet 3.
- a latch bolt 6 is also pivotally mounted on the main body 1 and is receivable in a slot 5 in the other end of the clamp 4.
- the latch bolt 6 is screw-threaded along at least part of its length and a nut 7 and washer 8 are provided thereon.
- the other end of the main body 1 is curved from the axis of the major portion of the length of said body and terminates in a part 11 extending substantially at right angles to said axis.
- the part 11 is provided with a screw-threaded bore for receiving a screw 12.
- the fitting is secured to a length of scaffold tube 9 by engaging the arcuate recess 2 on said scaffold tube 9 and pivoting the clamp 4 into engagement with said scaffold tube 9.
- the latch bolt 6 is then allowed to drop into the slot 5 in the clamp 4 and the nut 7 turned until the body 1 and clamp 4 are clamped to the scaffold tube 9 in an immovable manner.
- the fitting is then ready for the part 11 of the main body 1 to be hooked over the flange 1-3 of a flanged girder.
- the screw 12 is then turned to draw the scaffold tube 9 into engagement with the underside of the flange 13.
- the vertical load from the scaffold tube 9 is transferred via the lug retaining the rivet 3, into the main body 1.
- the latch bolt 6 is only subjected to loads from the fitting 10 being clamped onto the scaffold tube 9.
- the fitting 10 comprises a main body 14 having adjacent one end an arcuate recess 15 and on which one end of latch or clamp 16 is pivotally mounted by means of a rivet 17.
- a latch bolt 18 pivotally mounted on the main body 14 is receivable in a slot 19 in the other end of the clamp 16.
- Part of the length of the latch bolt 18 is screw-threaded for receiving a nut 20, a washer 21 being interposed between the nut 20 and clamp 16.
- the other end of the main body 14 is curved from the axis of the major portion of the length of said body 14 and terminates in a part 22 extending substantially at right angles to said axis.
- the end of said part 22 is provided with a bar-like projection 22a the longitudinal axis of which is substantially perpendicular to said axis of the main body 14 as well as to the remainder of part 22.
- the projection 22a is intended to rest on the flange 13 of a flanged girder.
- a lug 23 which is aligned with the part 22 but spaced therefrom.
- the lug 23 is provided with a screw-threaded bore for receiving a screw 24.
- the fitting shown in Figures 3 and 4 can be secured to a length of scaffold tube 9 by engaging the arcuate recess 15 on the scaffold tube 9 and pivoting the clamp 16 into engagement with the said scaffold tube 9.
- the latch bolt 18 is then allowed to drop into the slot 19 in the clamp 16 and the nut 20 turned until the main body 14 and clamp 16 are clamped to the scaffold tube 9 in an immovable manner.
- the part 22 can then be hooked over the flange 13 of a flanged girder so that the projection 22a bears on said flange 13 and the screw 24 turned to clamp the fitting 10 to the flange 13.
- the vertical load from the scaffold tube 9 is transferred to the main body 14 via the lug retaining the rivet 17 so that the latch bolt 18 is subjected only to the load of the fitting 10 being clamped onto the scaffold tube 9.
- the load of the scaffold tube 9 and fitting 10 is borne by the part 22 and its projection 22a, the screw 24 serving merely to secure the fitting 10 onto the girder and not being subjected to direct load.
- the main body 1 or 14 and latch or clamp 4 or 16 are preferably made of drop forged steel while the bolt 6 or 18 and screw 12 or 24 are preferably made of mild steel although other materials may be used if desired.
- Figures 5 and 6 show the manner in which fittings according to the invention can be used to suspend a working platform from a series of flanged girders forming the steelwork of, for example, a bridge or roof in order to gain access for painting or maintenance work for example.
- a single scaffold tube 9 is secured to the flanges 13 of two parallelly- extending girders 25 and 26 by two fittings 10.
- a series of vertical scaffold tubes 27 are secured at spaced intervals to the scaffold tube 9 and a horizontal scaffold tube 28 is secured to the scaffold tubes 27 to extend parallel to the scaffold tube 9 to form a framework.
- This framework is secured to a like framework 29 ( Figure 6) by further horizontal scaffold tubes 30, 31 and 32, the tubes 32 being interconnected between the two frameworks by a transversely extending scaffold tube 33.
- Timber boards 34 are laid on the scaffold tubes 28 and 33 to form a working platform. Additional vertical boards 35 serve as toe boards and the scaffold tubes 31 serve as hand rails.
- the platform may be extended further by other frameworks 29 as shown in Figure 6.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
Description
- This invention relates to the attachment of scaffolding platforms, workmen's platforms or cradles and the like to flanged girders of steel or like material and is particularly concerned with fittings for securing scaffolding to such girders.
- It is known to clamp scaffold tubes to one another at right angles by means of clamps which are shaped to engage around the scaffold tubes and which are held in position by means of a single screw. Such arrangements are disclosed for example in GB-A- 785128 and 653810. However, such arrangements cannot be used to clamp scaffold tubes to flanged girders.
- The present invention aims to provide a fitting which can be used to clamp a scaffold tube to a flanged girder, the scaffold tube forming part of a workmen's platform or cradle whereby said platform can be secured directly to the girder.
- US-A-2,165,221 discloses a fitting adapted to be secured to a horizontal length of scaffold tube for clamping said scaffold tube to the horizontal flange of a flanged girder, said fitting comprising a main body, a clamp pivotally mounted on the lower portion of the main body, said clamp and main body being so shaped as to co-operatively receive and clamp between them said length of scaffold tube, fastening means for releasably securing the clamp to the main body, and a screw arranged to engage the surface of said girder flange to clamp the main body to the girder, whereby, in use, the main body and clamp are secured to the scaffold tube at a position adjacent to an edge portion of the girder flange, a part of the main body overlying the upper surface of horizontal flange of the flanged girder and the main body being clamped to the girder flange by the screw engaging the surface of said flange.
- This prior arrangement provides a coupler for two scaffold tubes which is intended to be placed against a girder for rigidity purposes for the fitting itself and is not designed for use as the main weight bearing device for constructing a drop scaffold tube used in the construction of a workmen's platform or cradle. This prior fitting has a boss which is designed to take a latch securing bolt but is not intended to seat on the horizontal flange of a girder. If the bolt were to shear, the latch jaw would be released and the scaffold tube held therein could jump out. Furthermore, the small area of the boss which would drop onto the girder flange in the event of bolt failure would be insufficient to maintain the scaffold in place particularly if the scaffold tube had worked loose or fallen down as a result of failure of the bolt. The fitting is therefore totally unsuitable for use in constructing workmen's cradles or platforms.
- The primary aim of this invention is to provide a fitting which can be used with complete safety to construct a workmen's cradle or platform by securely clamping a scaffold tube forming part of the cradle or platform directly to a flanged girder.
- Accordingly, the present invention is characterized in that the major length of the main body extends, in use, in the vertical direction, the fastening means is substantially horizontally disposed when the fitting is in use, the part of the main body extends, at a position remote from the pivotal connection of the clamp, in a direction substantially at right angles to the major length of the main body, and the said main body has at its lower end a portion which is provided with an arcuate recess to receive and engage the scaffold tube such that the vertical load of the scaffold tube is borne substantially entirely by the main body, the fastening means being only subjected to horizontal loads from the fitting being clamped onto the scaffold tube.
- The invention will now be further described, by way of example, with reference to the accompanying drawings, in which:--
- Figure 1 is a side elevation of one embodiment of a girder fitting according to the invention;
- Figure 2 is a front elevation of the fitting shown in Figure 1;
- Figure 3 is a side elevation of a second embodiment of a girder fitting according to the invention;
- Figure 4 is a front elevation of the fitting shown in Figure 3;
- Figure 5 shows one manner in which fittings according to the invention may be used in the construction of a working platform; and
- Figure 6 is a section taken on the line VI-VI in Figure 5.
- In the drawings, like parts are denoted by like reference numerals.
- Reference will first be made to Figures 1 and 2 of the drawings in which the
fitting 10 comprises a main body 1 having, adjacent one end, anarcuate recess 2 and on which one end of a latch orclamp 4 is pivotally mounted by means of arivet 3. Alatch bolt 6 is also pivotally mounted on the main body 1 and is receivable in aslot 5 in the other end of theclamp 4. Thelatch bolt 6 is screw-threaded along at least part of its length and anut 7 andwasher 8 are provided thereon. - The other end of the main body 1 is curved from the axis of the major portion of the length of said body and terminates in a
part 11 extending substantially at right angles to said axis. Thepart 11 is provided with a screw-threaded bore for receiving ascrew 12. - In use, the fitting is secured to a length of
scaffold tube 9 by engaging thearcuate recess 2 on saidscaffold tube 9 and pivoting theclamp 4 into engagement with saidscaffold tube 9. Thelatch bolt 6 is then allowed to drop into theslot 5 in theclamp 4 and thenut 7 turned until the body 1 andclamp 4 are clamped to thescaffold tube 9 in an immovable manner. The fitting is then ready for thepart 11 of the main body 1 to be hooked over the flange 1-3 of a flanged girder. Thescrew 12 is then turned to draw thescaffold tube 9 into engagement with the underside of theflange 13. - Owing to the main body 1 being in a vertical plane, the vertical load from the
scaffold tube 9 is transferred via the lug retaining therivet 3, into the main body 1. By means of this arrangement, thelatch bolt 6 is only subjected to loads from the fitting 10 being clamped onto thescaffold tube 9. - Referring now to Figures 3 and 4 of the drawings, the
fitting 10 comprises amain body 14 having adjacent one end anarcuate recess 15 and on which one end of latch orclamp 16 is pivotally mounted by means of arivet 17. Alatch bolt 18 pivotally mounted on themain body 14 is receivable in aslot 19 in the other end of theclamp 16. Part of the length of thelatch bolt 18 is screw-threaded for receiving anut 20, awasher 21 being interposed between thenut 20 andclamp 16. - The other end of the
main body 14 is curved from the axis of the major portion of the length ofsaid body 14 and terminates in apart 22 extending substantially at right angles to said axis. The end of saidpart 22 is provided with a bar-like projection 22a the longitudinal axis of which is substantially perpendicular to said axis of themain body 14 as well as to the remainder ofpart 22. Theprojection 22a is intended to rest on theflange 13 of a flanged girder. - Located intermediate the ends of the
main body 14 and extending substantially at right angles to the said axis of themain body 14 is alug 23 which is aligned with thepart 22 but spaced therefrom. Thelug 23 is provided with a screw-threaded bore for receiving ascrew 24. - As with the embodiment described with reference to Figures 1 and 2 of the drawings, the fitting shown in Figures 3 and 4 can be secured to a length of
scaffold tube 9 by engaging thearcuate recess 15 on thescaffold tube 9 and pivoting theclamp 16 into engagement with the saidscaffold tube 9. Thelatch bolt 18 is then allowed to drop into theslot 19 in theclamp 16 and thenut 20 turned until themain body 14 andclamp 16 are clamped to thescaffold tube 9 in an immovable manner. Thepart 22 can then be hooked over theflange 13 of a flanged girder so that theprojection 22a bears on saidflange 13 and thescrew 24 turned to clamp thefitting 10 to theflange 13. - Again, in this case, the vertical load from the
scaffold tube 9 is transferred to themain body 14 via the lug retaining therivet 17 so that thelatch bolt 18 is subjected only to the load of thefitting 10 being clamped onto thescaffold tube 9. Moreover, in this embodiment, the load of thescaffold tube 9 and fitting 10 is borne by thepart 22 and itsprojection 22a, thescrew 24 serving merely to secure thefitting 10 onto the girder and not being subjected to direct load. - The
main body 1 or 14 and latch orclamp bolt screw - Either of the above described fittings according to the invention can be used in a variety of applications, examples of which are shown in Figures 5 and 6 of the accompanying drawings.
- Figures 5 and 6 show the manner in which fittings according to the invention can be used to suspend a working platform from a series of flanged girders forming the steelwork of, for example, a bridge or roof in order to gain access for painting or maintenance work for example. As shown in Figure 5, a
single scaffold tube 9 is secured to theflanges 13 of two parallelly- extendinggirders fittings 10. - A series of
vertical scaffold tubes 27 are secured at spaced intervals to thescaffold tube 9 and ahorizontal scaffold tube 28 is secured to thescaffold tubes 27 to extend parallel to thescaffold tube 9 to form a framework. This framework is secured to a like framework 29 (Figure 6) by furtherhorizontal scaffold tubes tubes 32 being interconnected between the two frameworks by a transversely extendingscaffold tube 33.Timber boards 34 are laid on thescaffold tubes vertical boards 35 serve as toe boards and thescaffold tubes 31 serve as hand rails. The platform may be extended further byother frameworks 29 as shown in Figure 6. - It will be seen that, by means of the fitting according to the invention, standard equipment used throughout the scaffolding industry may be used to secure a variety of working platforms to girder form steelwork thus representing a considerable saving in special equipment which would otherwise be necessary.
- Other embodiments and modifications of the above described fittings are possible without departing from the scope of this invention as defined by the appended claims.
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB38960/77A GB1598788A (en) | 1977-09-19 | 1977-09-19 | Girder fittings |
GB3896077 | 1978-05-22 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0001342A1 EP0001342A1 (en) | 1979-04-04 |
EP0001342B1 true EP0001342B1 (en) | 1981-08-05 |
Family
ID=10406759
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP78300376A Expired EP0001342B1 (en) | 1977-09-19 | 1978-09-12 | Improvements in girder fittings |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0001342B1 (en) |
CA (1) | CA1126793A (en) |
GB (1) | GB1598788A (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2132679B (en) * | 1982-11-06 | 1986-03-05 | Burton Delingpole & Co Ltd | Scaffolding fitting |
GB2158139B (en) * | 1984-05-01 | 1988-01-13 | London & Midland Drop Forging | Scaffolding clamp |
CA1319552C (en) * | 1988-07-11 | 1993-06-29 | Cornelis Johannes Griek | Stanchion assembly |
AU626247B3 (en) * | 1988-07-11 | 1992-06-04 | Dgs Property Pty Ltd | A stanchion assembly |
GB2276414B (en) * | 1993-03-27 | 1996-05-15 | Edward Joseph Russell Campbell | Scaffolding bracket |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1710693A (en) * | 1928-01-18 | 1929-04-30 | American Safety Device Co | Clamp |
US2165221A (en) * | 1936-07-03 | 1939-07-11 | Burton John | Scaffolding clamp |
US4111579A (en) * | 1976-04-02 | 1978-09-05 | North Western Scaffolding Company Limited | Scaffolding |
-
1977
- 1977-09-19 GB GB38960/77A patent/GB1598788A/en not_active Expired
-
1978
- 1978-09-08 CA CA310,989A patent/CA1126793A/en not_active Expired
- 1978-09-12 EP EP78300376A patent/EP0001342B1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
EP0001342A1 (en) | 1979-04-04 |
CA1126793A (en) | 1982-06-29 |
GB1598788A (en) | 1981-09-23 |
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