CA2743832A1 - Scaffold ledger for supporting closely fitting steel or wood planks - Google Patents
Scaffold ledger for supporting closely fitting steel or wood planks Download PDFInfo
- Publication number
- CA2743832A1 CA2743832A1 CA2743832A CA2743832A CA2743832A1 CA 2743832 A1 CA2743832 A1 CA 2743832A1 CA 2743832 A CA2743832 A CA 2743832A CA 2743832 A CA2743832 A CA 2743832A CA 2743832 A1 CA2743832 A1 CA 2743832A1
- Authority
- CA
- Canada
- Prior art keywords
- ledger
- scaffold
- support
- work
- head
- 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.)
- Granted
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G1/00—Scaffolds primarily resting on the ground
- E04G1/15—Scaffolds primarily resting on the ground essentially comprising special means for supporting or forming platforms; 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
- E04G7/00—Connections between parts of the scaffold
- E04G7/02—Connections between parts of the scaffold with separate coupling elements
- E04G7/28—Clips or connections for securing boards
-
- 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
- E04G7/32—Scaffolding bars or members with non-detachably fixed coupling elements with coupling elements using wedges
Abstract
An improved ledger for a scaffold system uses an inverted U-shaped channel member where the base of the "U" is positioned essentially at the level of a work plank when supported in the ledger to continue the work surface. Preferably the ledger heads are adapted to releasably engage a cup type fastener or a rosette type fastener. The ledger head has a reduced upper width and has a wider bottom that is generally below a supported work plank. In a preferred embodiment the U-shaped channel is of an aluminum alloy tubular member with a downwardly extruding lower section reinforcing outwardly extending support flanges.
Description
TITLE: SCAFFOLD LEDGER FOR SUPPORTING CLOSELY FITTING
STEEL OR WOOD PLANKS
FIELD OF THE INVENTION
The present invention relates to scaffold ledgers and in particular to a scaffold ledger designed to support wood or steel planks in a manner to provide a more continuous work platform.
BACKGROUND OF THE INVENTION
Modular scaffolding systems are extensively used in the building and repair industries and provide safe and efficient access to elevated areas. Modular scaffolding systems have advantages over the conventional tube and clamp systems in that the components connect to one another at predetermined positions and the systems are more cost effective to erect and tear down.
Typically modular scaffolding systems are made of galvanized steel components. There are a number of well known proprietary arrangements that allow the components to be securely fixed to each other. In most cases the systems are not cross compatible.
These scaffold systems include vertical members, typically round tubular members, that cooperate with tubular horizontal members. The vertical members include predetermined securement points where a horizontal member can be connected to a vertical member by means of a ledger head provided on the horizontal members. The vertical members typically include an outwardly extending rosette to effect this securement or an outwardly extending cup type structure that receives an appropriately shaped ledger head for effecting securement therewith. Recently there has been consideration of using aluminum or aluminum alloy to reduce weight with respect to some of these components. Reduction in weight simplifies erection and tear down from a labour point of view.
Diagonal bracing members can also extend between different heights of rosettes to effect diagonal bracing of the structure.
Depending upon the application there may be the need for a work platform at a particular elevated height and typically these work platforms are defined by removable plank members which typically extend across one or more bays of the scaffold system. Steel or wood planks define a work platform within a bay and typically include hook members at either end of the planks for securement on tubular horizontal members of the bay.
With these systems there is a significant gap or interruption in the work platform in the order of about 2 inches between the edge of a plank and a similarly extending horizontal member of the bay. This significant gap is a potential hazard with respect to tools or material inadvertently falling through this gap and represents a significant potential hazard to workers or the general public who may be passing below or near the raised work platform.
In some applications wooden planks are used and these are typically laid across horizontal members and problems exist in providing a continuous type work surface between adjacent scaffold bays.
Recently some industries have determined that scaffold systems must reduce the risk with respect to falling of tools, materials or debris from a work platform through gaps between the edge of the work
STEEL OR WOOD PLANKS
FIELD OF THE INVENTION
The present invention relates to scaffold ledgers and in particular to a scaffold ledger designed to support wood or steel planks in a manner to provide a more continuous work platform.
BACKGROUND OF THE INVENTION
Modular scaffolding systems are extensively used in the building and repair industries and provide safe and efficient access to elevated areas. Modular scaffolding systems have advantages over the conventional tube and clamp systems in that the components connect to one another at predetermined positions and the systems are more cost effective to erect and tear down.
Typically modular scaffolding systems are made of galvanized steel components. There are a number of well known proprietary arrangements that allow the components to be securely fixed to each other. In most cases the systems are not cross compatible.
These scaffold systems include vertical members, typically round tubular members, that cooperate with tubular horizontal members. The vertical members include predetermined securement points where a horizontal member can be connected to a vertical member by means of a ledger head provided on the horizontal members. The vertical members typically include an outwardly extending rosette to effect this securement or an outwardly extending cup type structure that receives an appropriately shaped ledger head for effecting securement therewith. Recently there has been consideration of using aluminum or aluminum alloy to reduce weight with respect to some of these components. Reduction in weight simplifies erection and tear down from a labour point of view.
Diagonal bracing members can also extend between different heights of rosettes to effect diagonal bracing of the structure.
Depending upon the application there may be the need for a work platform at a particular elevated height and typically these work platforms are defined by removable plank members which typically extend across one or more bays of the scaffold system. Steel or wood planks define a work platform within a bay and typically include hook members at either end of the planks for securement on tubular horizontal members of the bay.
With these systems there is a significant gap or interruption in the work platform in the order of about 2 inches between the edge of a plank and a similarly extending horizontal member of the bay. This significant gap is a potential hazard with respect to tools or material inadvertently falling through this gap and represents a significant potential hazard to workers or the general public who may be passing below or near the raised work platform.
In some applications wooden planks are used and these are typically laid across horizontal members and problems exist in providing a continuous type work surface between adjacent scaffold bays.
Recently some industries have determined that scaffold systems must reduce the risk with respect to falling of tools, materials or debris from a work platform through gaps between the edge of the work
2 -platform and a support member. Although desirable a cost effective system has not been realized.
For some applications such as a temporary event stage it is important to have a continuous work surface and the present invention can also be used in this type of application.
It would be desirable to have a modular scaffolding system that allows for effective work platforms without the need for highly specialized components to overcome existing disadvantages. It is also desirable if this system is essentially backward compatible with existing scaffold vertical members and the traditional mechanical securement of horizontal support members to verticals.
SUMMARY OF THE INVENTION
A scaffold ledger according to the present invention comprises an elongate channel support of an inverted "U" shape and includes outwardly extending lower support flanges either side of the inverted "U" shape.
Opposed ledger heads are positioned either end of the elongate channel support and include a support base underlying the lower support flanges. A connecting segment secures the ledger head to the inverted "U" shape channel. Each ledger head above the support base includes a projecting portion adapted to releasably engage a fastening structure provided on a scaffold upright. The projecting portion in a top view decreases in width from the "U" shaped channel to a narrow end segment.
In an aspect of the invention the "U" portion is a width of about 40mm and forms an extension of the work surface defined by work planks.
For some applications such as a temporary event stage it is important to have a continuous work surface and the present invention can also be used in this type of application.
It would be desirable to have a modular scaffolding system that allows for effective work platforms without the need for highly specialized components to overcome existing disadvantages. It is also desirable if this system is essentially backward compatible with existing scaffold vertical members and the traditional mechanical securement of horizontal support members to verticals.
SUMMARY OF THE INVENTION
A scaffold ledger according to the present invention comprises an elongate channel support of an inverted "U" shape and includes outwardly extending lower support flanges either side of the inverted "U" shape.
Opposed ledger heads are positioned either end of the elongate channel support and include a support base underlying the lower support flanges. A connecting segment secures the ledger head to the inverted "U" shape channel. Each ledger head above the support base includes a projecting portion adapted to releasably engage a fastening structure provided on a scaffold upright. The projecting portion in a top view decreases in width from the "U" shaped channel to a narrow end segment.
In an aspect of the invention the "U" portion is a width of about 40mm and forms an extension of the work surface defined by work planks.
3 -In yet a further aspect of the invention the ledger heads are adapted to connect with a scaffold rosette with said outwardly extending flanges aligned with the rosette when attached thereto. Preferably work planks can partially extend over the rosette when supported by the ledger.
In an aspect of the invention the elongate channel support is an extruded tube of an aluminum or aluminum alloy material.
In a further aspect of the invention the extruded tube in cross section includes a bottom "V" shaped stiffening section with arms of said "V" shaped stiffening section connected to said outwardly extending support flanges at positions spaced from the "U" shaped channel.
BRIEF DESCRIPTION OF THE DRAWINGS
Preferred embodiments of the invention are shown in the drawings, wherein:
Figure 1 is a partial sectional view through a modified ledger member adapted to releasably support opposed plank members either side of the ledger member;
Figure 2 is a partial side view of a vertical scaffold member supporting a conventional plank or horizontal member where mechanical connection is to a ring type connector (prior art). This illustrates the significant gap provided between vertical members due to the size of their ring type connector;
Figure 3 is a side elevation showing a modified ledger and ledger head secured to a vertical scaffold member in accordance with the invention;
Figure 4 is a top view illustrating a vertical scaffold member and modified ledgers used to support two adjacent working planks;
In an aspect of the invention the elongate channel support is an extruded tube of an aluminum or aluminum alloy material.
In a further aspect of the invention the extruded tube in cross section includes a bottom "V" shaped stiffening section with arms of said "V" shaped stiffening section connected to said outwardly extending support flanges at positions spaced from the "U" shaped channel.
BRIEF DESCRIPTION OF THE DRAWINGS
Preferred embodiments of the invention are shown in the drawings, wherein:
Figure 1 is a partial sectional view through a modified ledger member adapted to releasably support opposed plank members either side of the ledger member;
Figure 2 is a partial side view of a vertical scaffold member supporting a conventional plank or horizontal member where mechanical connection is to a ring type connector (prior art). This illustrates the significant gap provided between vertical members due to the size of their ring type connector;
Figure 3 is a side elevation showing a modified ledger and ledger head secured to a vertical scaffold member in accordance with the invention;
Figure 4 is a top view illustrating a vertical scaffold member and modified ledgers used to support two adjacent working planks;
- 4 -Figure 5 is a top view similar to Figure 4 showing a conventional metal plank with hook members for securement to a traditional horizontal member to the left side of the vertical support post and a modified ledger supporting a wooding plank to the opposite side of the vertical post;
Figure 6 is a partial side view of a scaffold vertical member and two modified ledgers for defining a work platform;
Figure 7 is a top view looking downwardly on a vertical post having two modified ledgers extending in the left and right direction and two normal ledgers extending upwardly and downwardly illustrating the improved safety due to the close spacing of the wooden planks to the horizontal members and additionally shows a capping piece that can be secured to the vertical member;
Figure 8 is a perspective view of the capping component;
Figure 9 is a perspective view of the ledger head for securement either end of the modified ledger;
Figure 10 is a partial perspective view of the modified ledger with a secured ledger head;
Figure 11 is a front view of the ledger head;
Figure 12 is a top view of the ledger head;
Figures 13 and 14 are respectively a side view and an end view of a modified ledger head made of an aluminum material;
Figure 15 is a partial side view showing a ledger head secured to the modified aluminum ledger of Figure 13;
Figure 16 is a perspective view of the ledger head for securement to the aluminum ledger; and Figure 17 shows the ledger head of Figure 16 secured to the aluminum ledger.
Figure 6 is a partial side view of a scaffold vertical member and two modified ledgers for defining a work platform;
Figure 7 is a top view looking downwardly on a vertical post having two modified ledgers extending in the left and right direction and two normal ledgers extending upwardly and downwardly illustrating the improved safety due to the close spacing of the wooden planks to the horizontal members and additionally shows a capping piece that can be secured to the vertical member;
Figure 8 is a perspective view of the capping component;
Figure 9 is a perspective view of the ledger head for securement either end of the modified ledger;
Figure 10 is a partial perspective view of the modified ledger with a secured ledger head;
Figure 11 is a front view of the ledger head;
Figure 12 is a top view of the ledger head;
Figures 13 and 14 are respectively a side view and an end view of a modified ledger head made of an aluminum material;
Figure 15 is a partial side view showing a ledger head secured to the modified aluminum ledger of Figure 13;
Figure 16 is a perspective view of the ledger head for securement to the aluminum ledger; and Figure 17 shows the ledger head of Figure 16 secured to the aluminum ledger.
- 5 -DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
A modified ledger 2 is shown in Figure 1 designed to support work platform planks 4 in a manner to reduce gaps that may be present between the work planks and horizontal support members. The modified ledger head 2 includes a downwardly opening U-shaped channel 10 that terminates in outwardly extending support flanges 12 and 14. These support flanges support the ends or sides of the work planks 4 and the outwardly opening U-shaped channel 10 is of a similar height to the work planks such that the base of the inverted U-shaped channel is essentially at the level of the work planks (i.e. the surface of the work platform).
Figure 2 shows a prior art structure where a vertical scaffold post 20 is partially shown having the fixed mechanical ring type rosette 22. This rosette 22 cooperates with the ledger head 16 that is secured to a ledger 17 visible through the length of the plank. The plank could include hooks supporting the plank either end thereof to these horizontal members. With this prior art arrangement it can be seen that the edge of the plank is separated from the edge of the rosette by the overlap with the ledger head 16 and also the wedge 18 in the locked position as shown projects above the work surface and creating a possible tripping hazard. As shown in figure 2, there is a gap 21 of approximately two inches between the edge of the metal plank 15 and what would be an associated further vertical member. This substantial gap between the edge of the plank and the line of vertical members, as well as the projection of the wedge 18 above the work surface defined by the top of the plank 15, creates two possible hazards with this prior art system.
Figure 3 shows the modified system of the present invention where the ledger 2 supports a metal plank 5.
A modified ledger 2 is shown in Figure 1 designed to support work platform planks 4 in a manner to reduce gaps that may be present between the work planks and horizontal support members. The modified ledger head 2 includes a downwardly opening U-shaped channel 10 that terminates in outwardly extending support flanges 12 and 14. These support flanges support the ends or sides of the work planks 4 and the outwardly opening U-shaped channel 10 is of a similar height to the work planks such that the base of the inverted U-shaped channel is essentially at the level of the work planks (i.e. the surface of the work platform).
Figure 2 shows a prior art structure where a vertical scaffold post 20 is partially shown having the fixed mechanical ring type rosette 22. This rosette 22 cooperates with the ledger head 16 that is secured to a ledger 17 visible through the length of the plank. The plank could include hooks supporting the plank either end thereof to these horizontal members. With this prior art arrangement it can be seen that the edge of the plank is separated from the edge of the rosette by the overlap with the ledger head 16 and also the wedge 18 in the locked position as shown projects above the work surface and creating a possible tripping hazard. As shown in figure 2, there is a gap 21 of approximately two inches between the edge of the metal plank 15 and what would be an associated further vertical member. This substantial gap between the edge of the plank and the line of vertical members, as well as the projection of the wedge 18 above the work surface defined by the top of the plank 15, creates two possible hazards with this prior art system.
Figure 3 shows the modified system of the present invention where the ledger 2 supports a metal plank 5.
- 6 -In this embodiment the ledger head 30 engages the lower support flanges 12 and 14 of the ledger 2 and positions the top of the metal plank 5 at a raised position whereby the upper edge of the wedge 32 is generally at the top edge of the plank. This arrangement avoids the possible tripping hazard adjacent the vertical support for post 20. If the modified ledger 2 is also used to join the associated vertical member the bottom surface of the U-shaped channel will effectively provide a more continuous work surface between adjacent scaffold posts 20. This modified ledger also acts as a support edge for the metal plank 5.
The advantages of the present structure can be appreciated from a review of Figure 4. In this case two modified ledgers 2a and 2b of the preferred structure are used and extend in the left and right directions. A
conventional round tubular scaffold member 2c is used to extend between posts. Work plank 4a partially overlaps the securing rosette 22 with the work plank supported on one of the support flanges generally shown as 12b. The work plank 4b is supported on the outwardly extending support flange 12a. With this arrangement it can be seen that the modified ledger acts to continue the work surface of the planks resulting in only a minimal gap between the work planks 4a and 4b relative to the conventional ledger 2c. If a modified ledger is used in place of ledger 2c essentially a continuous work surface is provided between planks 4a and 4b.
Figure 5 shows a view similar to Figure 4 however a conventional work plank 4d is shown on the left hand side. This is supported on the conventional ledger 2d.
With this arrangement there is a large gap 19 between the edge of the plank 4d and the conventional ledger 2c.
This is in contrast to the right hand side having the modified ledger 2a support work plank 4b generally
The advantages of the present structure can be appreciated from a review of Figure 4. In this case two modified ledgers 2a and 2b of the preferred structure are used and extend in the left and right directions. A
conventional round tubular scaffold member 2c is used to extend between posts. Work plank 4a partially overlaps the securing rosette 22 with the work plank supported on one of the support flanges generally shown as 12b. The work plank 4b is supported on the outwardly extending support flange 12a. With this arrangement it can be seen that the modified ledger acts to continue the work surface of the planks resulting in only a minimal gap between the work planks 4a and 4b relative to the conventional ledger 2c. If a modified ledger is used in place of ledger 2c essentially a continuous work surface is provided between planks 4a and 4b.
Figure 5 shows a view similar to Figure 4 however a conventional work plank 4d is shown on the left hand side. This is supported on the conventional ledger 2d.
With this arrangement there is a large gap 19 between the edge of the plank 4d and the conventional ledger 2c.
This is in contrast to the right hand side having the modified ledger 2a support work plank 4b generally
- 7 -abutting the conventional ledger 2c and the inverted U-shaped channel of the ledger 2a acts to continue the work surface defined by plank 4b. With this arrangement a diagonal brace member 50, commonly used with the support post having a rosette, can still connect to the rosette and functions in its normal manner. The ledger heads for these bracing members can also be adapted to provide the wedge in a locked position generally flush with the surfaces to reduce a tripping hazard.
Figures 6, 7 and 8 show a particular design for event staging or for defining a temporary raised surface where it is desirable to have a continuous work surface.
In this case the vertical support posts terminate at the level of the work surface. Figure 7 shows two modified ledgers 2a and 2b in association with wooden planks and traditional horizontal ledgers 2c and 2d. The conventional ledgers 2c and 2d will typically have a rounded surface and thus the work surface between the top two work planks will include slight recesses although the gap is very narrow. In contrast the modified ledgers 2a and 2b cooperate with the ends of the work planks to provide a generally continuous surface.
As the vertical members have terminated essentially at the level of the work surface a cap member 60 is used to cover the rosette 22 and the various wedges etc. The cap member 60 includes a large circular top surface 62 that is oversized relative to the rosette.
This cap member 60 also includes a male connector 64 which is received in the end of the vertical member and essentially overlays the mechanical connection defined by the work surfaces of the planks. This is particularly desirable for temporary stages, for example, where the stage is defined by a number of bays between vertical members.
Figures 6, 7 and 8 show a particular design for event staging or for defining a temporary raised surface where it is desirable to have a continuous work surface.
In this case the vertical support posts terminate at the level of the work surface. Figure 7 shows two modified ledgers 2a and 2b in association with wooden planks and traditional horizontal ledgers 2c and 2d. The conventional ledgers 2c and 2d will typically have a rounded surface and thus the work surface between the top two work planks will include slight recesses although the gap is very narrow. In contrast the modified ledgers 2a and 2b cooperate with the ends of the work planks to provide a generally continuous surface.
As the vertical members have terminated essentially at the level of the work surface a cap member 60 is used to cover the rosette 22 and the various wedges etc. The cap member 60 includes a large circular top surface 62 that is oversized relative to the rosette.
This cap member 60 also includes a male connector 64 which is received in the end of the vertical member and essentially overlays the mechanical connection defined by the work surfaces of the planks. This is particularly desirable for temporary stages, for example, where the stage is defined by a number of bays between vertical members.
- 8 -Details of the particular ledger head and its cooperation with the modified ledger are shown in Figures
9 and 10. The profile of the modified ledger is shown and it can also be seen that the ends of the ledger are truncated on an angle particularly the support flanges 12 and 14 as well as the upper end of the ledger 2. The ledger head is of reduced width to allow a plank to be positioned close to a vertical post. The angling of the end portion of the U-shaped channel allows the wedge to be positioned in a release position and essentially lay against the base of the U-shaped channel. With this arrangement the ledger head is welded at side position 70 either side of the U-shaped channel and the large support flange 80 is positioned beneath the opposed support flanges 12 and 14. This further reinforces the ledger member and also minimizes damage at the ends of the ledger.
As discussed the ledger head is of reduced width while including the outwardly extending support flanges at a lower position. A conventional ledger head would have a width similar to the width defined between the edges of the support flanges.
In Figures 11 and 12 additional details of the ledger head are shown. The large flange 80 is oversized to provide support for outwardly extending flanges 12 and 14. It is also possible to provide a weld connection between this surface 80 and the outwardly extending flanges. Reducing the width of the ledger head to partially offset the flange 80 supports flanges 12 and 14.
Figures 13, 14 and 15 show yet a further variation of the ledger. In this case the ledger is made of an aluminum or an aluminum allow to reduce the weight thereof. The modified U-shaped channel ledger previously described would typically be of a steel material. To provide the sufficient strength the ledger is an extruded member again having the general U-shape however the base of the U-shape is joined by a downwardly offset portion 90. This downwardly offset portion provides additional reinforcing of the outwardly extending flanges 12a and 14a of the modified ledger 85. A slightly different ledger head 87 is shown having a pair of securing arms 89 that are inserted into the end of the ledger and connected to the walls 81 and 83 of the downwardly opening U-shaped channel. Again the ledger head is typically welded to this extruded tubular member.
A perspective view of the modified ledger head is shown in Figure 16 and an assembled modified ledger is shown in Figure 17 of the aluminum material. Preferably in addition to any weld securement there may be a mechanical securement by rivets or a bolt type connection typically shown at 100. A glued or epoxy connection is also possible or may be used in conjunction with a mechanical securement.
The modified ledger head can also be fabricated as shown in Figure 16 where the rear part bracket 102 is welded to a typically steel ledger head 104. Other arrangements for manufacture of the ledger head can be used but it is desirable to have the ledger head be inserted within the aluminum tubular member and be mechanically fastened thereto. As shown the bracket 102 has also been partially truncated to provide a clear area allowing the wedge to be fully removed and to be angled at an angle of approximately 45 .
The preferred ledger as disclosed in the various embodiments described and shown in the figures has one or more of the following advantages:
As discussed the ledger head is of reduced width while including the outwardly extending support flanges at a lower position. A conventional ledger head would have a width similar to the width defined between the edges of the support flanges.
In Figures 11 and 12 additional details of the ledger head are shown. The large flange 80 is oversized to provide support for outwardly extending flanges 12 and 14. It is also possible to provide a weld connection between this surface 80 and the outwardly extending flanges. Reducing the width of the ledger head to partially offset the flange 80 supports flanges 12 and 14.
Figures 13, 14 and 15 show yet a further variation of the ledger. In this case the ledger is made of an aluminum or an aluminum allow to reduce the weight thereof. The modified U-shaped channel ledger previously described would typically be of a steel material. To provide the sufficient strength the ledger is an extruded member again having the general U-shape however the base of the U-shape is joined by a downwardly offset portion 90. This downwardly offset portion provides additional reinforcing of the outwardly extending flanges 12a and 14a of the modified ledger 85. A slightly different ledger head 87 is shown having a pair of securing arms 89 that are inserted into the end of the ledger and connected to the walls 81 and 83 of the downwardly opening U-shaped channel. Again the ledger head is typically welded to this extruded tubular member.
A perspective view of the modified ledger head is shown in Figure 16 and an assembled modified ledger is shown in Figure 17 of the aluminum material. Preferably in addition to any weld securement there may be a mechanical securement by rivets or a bolt type connection typically shown at 100. A glued or epoxy connection is also possible or may be used in conjunction with a mechanical securement.
The modified ledger head can also be fabricated as shown in Figure 16 where the rear part bracket 102 is welded to a typically steel ledger head 104. Other arrangements for manufacture of the ledger head can be used but it is desirable to have the ledger head be inserted within the aluminum tubular member and be mechanically fastened thereto. As shown the bracket 102 has also been partially truncated to provide a clear area allowing the wedge to be fully removed and to be angled at an angle of approximately 45 .
The preferred ledger as disclosed in the various embodiments described and shown in the figures has one or more of the following advantages:
- 10 -1) A ledger head and wedge type end connector with a narrow top portion to allow planks to pass on either side and a wide bottom portion to allow a place for welding the ledger head to the underside of the "Top Hat"
profile.
2) A ledger head and wedge type end connector that is narrow at the top and bottom and with a bracket on the rear that allows it to be attached to the aluminum "Top Hat" profile.
3) A ledger head and wedge type end connector which allows the planks to pass on either side and rest upon the rosette.
4) A ledger head and wedge type connector with a wedge that has been designed so that it does not protrude above the top of the "Top Hat" profile and avoids creating a tripping hazard.
5) A capping piece with a male connecting piece that fits into the top of the scaffold vertical member and has a square, round or other shape top plate that sits upon the top of the "Top hat" profiles and covers the tops of the wedges to provide a level working surface that is fee from gaps and trip hazards.
6) A ledger head and wedge type end connector that is attached to the ends of a "Top Hat" profile that is made of steel or aluminum.
7) A top hat section with ends that are angled back to allow the wedge to rest in a "parked" position.
8) An aluminum "Top Hat" ledger profile that is tubular and has flat areas at the ends of the horizontal legs to accommodate a wind latch.
profile.
2) A ledger head and wedge type end connector that is narrow at the top and bottom and with a bracket on the rear that allows it to be attached to the aluminum "Top Hat" profile.
3) A ledger head and wedge type end connector which allows the planks to pass on either side and rest upon the rosette.
4) A ledger head and wedge type connector with a wedge that has been designed so that it does not protrude above the top of the "Top Hat" profile and avoids creating a tripping hazard.
5) A capping piece with a male connecting piece that fits into the top of the scaffold vertical member and has a square, round or other shape top plate that sits upon the top of the "Top hat" profiles and covers the tops of the wedges to provide a level working surface that is fee from gaps and trip hazards.
6) A ledger head and wedge type end connector that is attached to the ends of a "Top Hat" profile that is made of steel or aluminum.
7) A top hat section with ends that are angled back to allow the wedge to rest in a "parked" position.
8) An aluminum "Top Hat" ledger profile that is tubular and has flat areas at the ends of the horizontal legs to accommodate a wind latch.
- 11 -9) A "Top Hat" profile, used with ledger head and wedge type end connectors, and has a 40mm wide top part.
10) A "Top Hat" ledger profile that is welded or otherwise attached to a Ledger Head and Wedge type end connector, such that the surface upon which the planks rest is at the same level as the rosette connection located on the vertical scaffold members.
Although preferred embodiments of the present invention have been described herein in detail, it will be appreciated by those skilled in the art, that variations may be made thereto without departing from the substance of the invention.
10) A "Top Hat" ledger profile that is welded or otherwise attached to a Ledger Head and Wedge type end connector, such that the surface upon which the planks rest is at the same level as the rosette connection located on the vertical scaffold members.
Although preferred embodiments of the present invention have been described herein in detail, it will be appreciated by those skilled in the art, that variations may be made thereto without departing from the substance of the invention.
- 12 -
Claims (5)
1. A scaffold ledger comprising an elongate channel support of an inverted "U" shape and including outwardly extending lower support flanges either side of said inverted "U" shape; opposed ledger heads either end of said elongate channel support; each ledger head including a support base underlying said lower support flanges and a connecting segment secured to said inverted "U" shape;
each ledger head above said support base including a projecting portion adapted to secure to a fastening structure provided on a scaffold upright; said projecting portion in a top view decreasing in width from said "U"
shaped channel to a narrow end segment.
each ledger head above said support base including a projecting portion adapted to secure to a fastening structure provided on a scaffold upright; said projecting portion in a top view decreasing in width from said "U"
shaped channel to a narrow end segment.
2. A scaffold ledger as claimed in claim 1 wherein a base of said "U" portion is a width of about 40mm.
3. A scaffold ledger as claimed in claim 1 or claim 2 wherein said ledger heads are adapted to connect with a scaffold rosette with said outwardly extending flanges aligned with said rosette when attached thereto.
4. A scaffold ledger as claimed in claim 1, 2 or 3 wherein said elongate channel support is an extruded tube of an aluminum or aluminum alloy material.
5. A scaffold ledger as claimed in claim 4 wherein said extruded tube in cross section includes a bottom "V"
shaped stiffening section with arms of said "V" shaped stiffening section connected to said outwardly extending support flanges at positions spaced from said "U" shaped channel.
shaped stiffening section with arms of said "V" shaped stiffening section connected to said outwardly extending support flanges at positions spaced from said "U" shaped channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2743832A CA2743832C (en) | 2011-06-21 | 2011-06-21 | Scaffold ledger for supporting closely fitting steel or wood planks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2743832A CA2743832C (en) | 2011-06-21 | 2011-06-21 | Scaffold ledger for supporting closely fitting steel or wood planks |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2743832A1 true CA2743832A1 (en) | 2012-12-21 |
| CA2743832C CA2743832C (en) | 2018-05-22 |
Family
ID=47429390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2743832A Active CA2743832C (en) | 2011-06-21 | 2011-06-21 | Scaffold ledger for supporting closely fitting steel or wood planks |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2743832C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018186756A1 (en) * | 2017-04-05 | 2018-10-11 | Safesmart Access Limted | Temporary stage structure |
| WO2018206525A1 (en) * | 2017-05-09 | 2018-11-15 | At-Pac China Business Trust | Modified ledger and modular scaffold system with continuous work surface |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO345872B1 (en) * | 2019-07-12 | 2021-09-20 | Frico As | A tubular transom for scaffolding or falsework having ends configured to be connected to verticals at node sections. |
-
2011
- 2011-06-21 CA CA2743832A patent/CA2743832C/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018186756A1 (en) * | 2017-04-05 | 2018-10-11 | Safesmart Access Limted | Temporary stage structure |
| WO2018206525A1 (en) * | 2017-05-09 | 2018-11-15 | At-Pac China Business Trust | Modified ledger and modular scaffold system with continuous work surface |
| US11255095B2 (en) | 2017-05-09 | 2022-02-22 | At-Pac China Business Trust | Modified ledger and modular scaffold system with continuous work surface |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2743832C (en) | 2018-05-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100520418B1 (en) | Dismountable facade scaffold | |
| US9051746B2 (en) | Integrated plank and toeboard system | |
| US8978822B2 (en) | Vertical frame of metal | |
| US8245816B2 (en) | Integral safety system which can be used for construction | |
| KR100841240B1 (en) | Built-up scaffold for construction field | |
| US11255095B2 (en) | Modified ledger and modular scaffold system with continuous work surface | |
| EP1233122A2 (en) | Facade scaffolding | |
| CN108699847B (en) | Side panel, ceiling formwork system with at least one such side panel and method for erecting such a side panel | |
| CA2743832C (en) | Scaffold ledger for supporting closely fitting steel or wood planks | |
| CA2570528A1 (en) | Fittings for builders' trestles | |
| AU2021424267A1 (en) | Arrangement of scaffolding components | |
| AU2010100013A4 (en) | Temporary edge protection for scaffolding | |
| US20110278526A1 (en) | Reusable temporary safety rail post and extension kit | |
| JP2522751B2 (en) | Framework scaffolding | |
| CA2268946A1 (en) | Securing device for a supporting bar | |
| KR200413590Y1 (en) | Scaffold and construction structure thereof | |
| US10731362B2 (en) | Horizontal scaffold support component | |
| US3117350A (en) | Portable bleacher | |
| GB2350859A (en) | Scaffolding fixtures | |
| AU2010224325B2 (en) | Temporary edge protection for scaffolding | |
| GB2428729A (en) | A scaffold stair unit | |
| JP6276073B2 (en) | Widening / narrowing scaffolding member and temporary scaffolding incorporating this scaffolding member | |
| KR102289940B1 (en) | A Study on the Hypothesis Tread Plates for Framed Construction | |
| KR102331326B1 (en) | Connecting bridge for scaffolding scaffold | |
| AU2021218207A1 (en) | Scaffolding pole |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |
Effective date: 20160415 |