CA1164512A - Safety device to prevent the lifting of scaffolding - Google Patents
Safety device to prevent the lifting of scaffoldingInfo
- Publication number
- CA1164512A CA1164512A CA000383959A CA383959A CA1164512A CA 1164512 A CA1164512 A CA 1164512A CA 000383959 A CA000383959 A CA 000383959A CA 383959 A CA383959 A CA 383959A CA 1164512 A CA1164512 A CA 1164512A
- Authority
- CA
- Canada
- Prior art keywords
- rail
- brackets
- cross
- scaffolding
- secured
- 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
Landscapes
- Emergency Lowering Means (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
This invention relates to an improved safety device which prevents the lifting of walk-planks which are secured by means of jaws or hooks to cross-brackets of scaffolding, The device comprises a rail which is adapted to be laid over the jaw and has at least one hook-shaped attachment element which fits through a corresponding hole in the web of the cross-brackets The device prevents any lifting of the jaws away from the cross-brackets and has eliminated the need for longitudinal brackets yet maintains a high degree of safety as the walk-planks act as horizontal stiffening elements. It therefore has effectively simplied the construction of scaffolding while maintaining a high degree of safety, when compared to the devices of the prior art.
This invention relates to an improved safety device which prevents the lifting of walk-planks which are secured by means of jaws or hooks to cross-brackets of scaffolding, The device comprises a rail which is adapted to be laid over the jaw and has at least one hook-shaped attachment element which fits through a corresponding hole in the web of the cross-brackets The device prevents any lifting of the jaws away from the cross-brackets and has eliminated the need for longitudinal brackets yet maintains a high degree of safety as the walk-planks act as horizontal stiffening elements. It therefore has effectively simplied the construction of scaffolding while maintaining a high degree of safety, when compared to the devices of the prior art.
Description
This invention relates generally to scafEolding and more particularly, to a new saEety device which prevents the lifting of walk-planks which are secured by means of jaws or hooks to the cross-brackets of the scaffolding.
In the past, U-shaped cross-brackets have been used to secure walk-planks to scaffoldiny and these are generally secured by means of jaws or sirnilar securing meansO ScafEolding of this type is usually sti~fened by means of longitudinal brackets.
It is also known to use a walk-plank which is suffic-iently still which eliminates the need for longitudinal brackets and which themselves act as stiffening agents. However, in these cases, severe di~ficulties arise if tension or compression is applied o~liquely since the scaf~olding may become distorted and there is a resulting danger of the hook-shaped jaws being lifted upwardly away from the cross brackets~ Thus, in the absence of longitudinal brackets, the stiffening effect of the walk-planks and the safety of the scaffolding is in some doubt.
Accordingly, it is an object of the present invention to at least partially overcome these disadvantages by providing a novel device which will prevent any lifting of the jaw a~ay frorn the cross-brackets.
It is a ~urther object o~ the invention to provide a novel device which has ef~ectively eliminated the need for long~
itudinal brackets~
It is a yet further objec-t of the present invention to provide a novel device wherein the walk-planks act as hori20ntal stiffening elements.
To this end r in one of its aspects, the invention pro-vides a device for preventing walk-planks secured by means of jaws ~ ~ 6 ~
1 to scaffolding cross-brackets from lifting wherein said cross-bracke-ts are U-shaped, provided with at least one elongated hole in the webbing running in the direction of the longitudinaJ. axis of the brackets, and are secured to vertical mem~ers of said scaffolding which comprises a rail adapted to be laid over said jaws, said rail including a-t least one hook-shaped attachment elemen-t adapted to fit through said at least one elongated hole and a plate pi.votally secured to one end oE said rail~
Further objects and advantages of the invention will appear from -the followin~ description taken together with the accompanyiny drawings in which:
FIGURE 1 is a side elevational view of the rail of the present invention;
FIGURE 2 is a bottom view of figure 1 in the direction of arrow II of figure l;
FIGURE 3 is a section view through the rail of figure 1 along line III-III of figure 1;
EIGURE 4 is a plan view of the ioint between ~wo adjacent walk-planks, with the rail in position;
FIGURE S is a sectional view through one end of figure 4~ along line V-V;
FIGURE 6 is a sectional view thrsu~h figure 4 along line VI-VI of figure S~
Reference is first made to figure 1 which shows a side elevational view of the rail. Rail 1 is fitted at one end with hinge 3 to which is pivotally affixed, plate 2 Each of the two ed~es oE rail 1 has a fold 4 which serves to impact thereto, the necessary stiffness~ Two hook-shaped attachment elements 5 are fitted to the under-surface of rail 1 which maycOnsist~ for example, of a piece of sheet-metal which tapers in the downward direction 5 ~L 2 1 and which is folded on its two edges~ The number of elements 5 is not critical to the invention and the inven-tion will be de-scribed (showing 2) such elements, Elements 5 are welded on their respective upper edges to rail 1 and the lower edge 6 is bent at right angles in such a manner that the hook~shaped part points away from the end Eitted wi-th plate 2.
The front end of plate 2 is provided with a slot 7 and the opposite end of rail 1 is provided with a slot 7', the pur~
poses o~ which will be e~plained hereinafter.
The operation and ~unction of the device will now be explained with specific re~erence to figures ~ to 6. Generally, the walk-planks having jaw~ located at the ends thereof, are first fitted from above to the U-shaped cross-brackets and then the rails having one or more hook-shaped a-ttachment elements are laid on the jaws after the pivotal plate has been folded upwardly.
The attachment element or elements are then arranged in such a manner that the hook-shaped ends thereof engage through elongated holes located in the web of the cross-brackets. As soon as the rail rests on the jaws, the rail is shi-Eted towards one end far enough to allow the plate to be iolded downwardly. The rail is now locked in place long.itudinally. The bent. end of the attach-ment element slides under the end-edge of the elongated hole thus preventing the jaws from being lifted of the cross-brackets and ach.ieving the desired result.
~ ore specifically, this operation will now be explained with specific reference to figures 4 to 6, as an example of the operation. In this e~ample, the horizontal and vertical elements o:E the scafEolding are secured to circular, disc-shaped connecting Elanges 14 which are loca-ted at regular intervals on vertical, -tubular scaffolding columns 11. The connec-ting :Elanges 14 are provided with Eour longitudinally oval openings 17 which are arranged with their longitudinal axes at right 1 angles to each other, with a wide opening 18 be-tween each of two openings 17~ The horizontal and vertical scaffolding elements are secured to the connecting flanges 14 in that they engage around a connecting shoe 13 of Elange .14. The shoe 13 is provided at one end on ~o-th ends with a horizontal opening 12 and are secured to the flange 14 by means of a wedge 15 wh.ich engages one of the openings 17 or 18 Regulation edge-boards 16 are then fitted as is known.
~s shown in fi~ure 4, ~-shaped cross-bracket 21 is con-cealed b~ the rail 1~ Cross-bracket 21 has a web 26 which con-tains elongated holes 22 which correspond to the attachment elements 5 on the rail 1. Th.e holes 22 are arranged in such a manner and are of such.a size such that, after rail 1 is fitted and has been moved to the desired terminal position, hooks 6 at the end~edcJe of the elongated hole 22, engaye the we~ 26 of the cross-bracke-t 21 and bear directly thereagainst, As the scaf-folding is bein~ erected, and after the cross-brackets have been secured, adjacent walk-planks 23 are fitted from both sides, with the aid oE jaws 24, at their front ends, to upwardly directed 20 ~langes 25 (see figure 6~ of both cross-bracket 21, Rail 1 is then placed from above, in jaws 24, The plate 2, having been folded upwardly, is brough down in such a manner that hin~e 3 moves along the edge of the wedge 15 and attachment elements 5 engage through the slots 22, The dimensions o~ the attachment elements 5 are such that the distance h between the hook-shaped part 6 and the lower flange of the rail 1 i.s sufficient to allow the hook-shaped part 6 to bear upon the weh 26 of the cross-bracket 21 after the rail has been moved into its terminal position, As soon as th.e bent edge 4 of the rail 1 lies upon jaws I ~L 8 ~
1 24 of walk-planks 23, the rail 1 is moved in the direction of arrow a far enough to allow slot 7' to engage around wedge 15 and to allow plate 2 to be folded down~ whereupon slot 7 provided in plate 2, encJages in turn around the corresponding wedge 15. This displace~lerlt in the direction of arrow a allows the hooks 6 to engage under the web 26 of cross-bracket 21 while the Eolding down of plate 2 prevents any displacement in the opposite direction.
The rail is thus firmly locked in position and the a-ttachment element 5 prevents any lifting of the jaws 24, Although the disclosuredescribes and .illustrates a pre-ferréd em~odiment of the invention, it is to be understood the invention is not restricted to this par-ticular em~odiment, ~0 3~
In the past, U-shaped cross-brackets have been used to secure walk-planks to scaffoldiny and these are generally secured by means of jaws or sirnilar securing meansO ScafEolding of this type is usually sti~fened by means of longitudinal brackets.
It is also known to use a walk-plank which is suffic-iently still which eliminates the need for longitudinal brackets and which themselves act as stiffening agents. However, in these cases, severe di~ficulties arise if tension or compression is applied o~liquely since the scaf~olding may become distorted and there is a resulting danger of the hook-shaped jaws being lifted upwardly away from the cross brackets~ Thus, in the absence of longitudinal brackets, the stiffening effect of the walk-planks and the safety of the scaffolding is in some doubt.
Accordingly, it is an object of the present invention to at least partially overcome these disadvantages by providing a novel device which will prevent any lifting of the jaw a~ay frorn the cross-brackets.
It is a ~urther object o~ the invention to provide a novel device which has ef~ectively eliminated the need for long~
itudinal brackets~
It is a yet further objec-t of the present invention to provide a novel device wherein the walk-planks act as hori20ntal stiffening elements.
To this end r in one of its aspects, the invention pro-vides a device for preventing walk-planks secured by means of jaws ~ ~ 6 ~
1 to scaffolding cross-brackets from lifting wherein said cross-bracke-ts are U-shaped, provided with at least one elongated hole in the webbing running in the direction of the longitudinaJ. axis of the brackets, and are secured to vertical mem~ers of said scaffolding which comprises a rail adapted to be laid over said jaws, said rail including a-t least one hook-shaped attachment elemen-t adapted to fit through said at least one elongated hole and a plate pi.votally secured to one end oE said rail~
Further objects and advantages of the invention will appear from -the followin~ description taken together with the accompanyiny drawings in which:
FIGURE 1 is a side elevational view of the rail of the present invention;
FIGURE 2 is a bottom view of figure 1 in the direction of arrow II of figure l;
FIGURE 3 is a section view through the rail of figure 1 along line III-III of figure 1;
EIGURE 4 is a plan view of the ioint between ~wo adjacent walk-planks, with the rail in position;
FIGURE S is a sectional view through one end of figure 4~ along line V-V;
FIGURE 6 is a sectional view thrsu~h figure 4 along line VI-VI of figure S~
Reference is first made to figure 1 which shows a side elevational view of the rail. Rail 1 is fitted at one end with hinge 3 to which is pivotally affixed, plate 2 Each of the two ed~es oE rail 1 has a fold 4 which serves to impact thereto, the necessary stiffness~ Two hook-shaped attachment elements 5 are fitted to the under-surface of rail 1 which maycOnsist~ for example, of a piece of sheet-metal which tapers in the downward direction 5 ~L 2 1 and which is folded on its two edges~ The number of elements 5 is not critical to the invention and the inven-tion will be de-scribed (showing 2) such elements, Elements 5 are welded on their respective upper edges to rail 1 and the lower edge 6 is bent at right angles in such a manner that the hook~shaped part points away from the end Eitted wi-th plate 2.
The front end of plate 2 is provided with a slot 7 and the opposite end of rail 1 is provided with a slot 7', the pur~
poses o~ which will be e~plained hereinafter.
The operation and ~unction of the device will now be explained with specific re~erence to figures ~ to 6. Generally, the walk-planks having jaw~ located at the ends thereof, are first fitted from above to the U-shaped cross-brackets and then the rails having one or more hook-shaped a-ttachment elements are laid on the jaws after the pivotal plate has been folded upwardly.
The attachment element or elements are then arranged in such a manner that the hook-shaped ends thereof engage through elongated holes located in the web of the cross-brackets. As soon as the rail rests on the jaws, the rail is shi-Eted towards one end far enough to allow the plate to be iolded downwardly. The rail is now locked in place long.itudinally. The bent. end of the attach-ment element slides under the end-edge of the elongated hole thus preventing the jaws from being lifted of the cross-brackets and ach.ieving the desired result.
~ ore specifically, this operation will now be explained with specific reference to figures 4 to 6, as an example of the operation. In this e~ample, the horizontal and vertical elements o:E the scafEolding are secured to circular, disc-shaped connecting Elanges 14 which are loca-ted at regular intervals on vertical, -tubular scaffolding columns 11. The connec-ting :Elanges 14 are provided with Eour longitudinally oval openings 17 which are arranged with their longitudinal axes at right 1 angles to each other, with a wide opening 18 be-tween each of two openings 17~ The horizontal and vertical scaffolding elements are secured to the connecting flanges 14 in that they engage around a connecting shoe 13 of Elange .14. The shoe 13 is provided at one end on ~o-th ends with a horizontal opening 12 and are secured to the flange 14 by means of a wedge 15 wh.ich engages one of the openings 17 or 18 Regulation edge-boards 16 are then fitted as is known.
~s shown in fi~ure 4, ~-shaped cross-bracket 21 is con-cealed b~ the rail 1~ Cross-bracket 21 has a web 26 which con-tains elongated holes 22 which correspond to the attachment elements 5 on the rail 1. Th.e holes 22 are arranged in such a manner and are of such.a size such that, after rail 1 is fitted and has been moved to the desired terminal position, hooks 6 at the end~edcJe of the elongated hole 22, engaye the we~ 26 of the cross-bracke-t 21 and bear directly thereagainst, As the scaf-folding is bein~ erected, and after the cross-brackets have been secured, adjacent walk-planks 23 are fitted from both sides, with the aid oE jaws 24, at their front ends, to upwardly directed 20 ~langes 25 (see figure 6~ of both cross-bracket 21, Rail 1 is then placed from above, in jaws 24, The plate 2, having been folded upwardly, is brough down in such a manner that hin~e 3 moves along the edge of the wedge 15 and attachment elements 5 engage through the slots 22, The dimensions o~ the attachment elements 5 are such that the distance h between the hook-shaped part 6 and the lower flange of the rail 1 i.s sufficient to allow the hook-shaped part 6 to bear upon the weh 26 of the cross-bracket 21 after the rail has been moved into its terminal position, As soon as th.e bent edge 4 of the rail 1 lies upon jaws I ~L 8 ~
1 24 of walk-planks 23, the rail 1 is moved in the direction of arrow a far enough to allow slot 7' to engage around wedge 15 and to allow plate 2 to be folded down~ whereupon slot 7 provided in plate 2, encJages in turn around the corresponding wedge 15. This displace~lerlt in the direction of arrow a allows the hooks 6 to engage under the web 26 of cross-bracket 21 while the Eolding down of plate 2 prevents any displacement in the opposite direction.
The rail is thus firmly locked in position and the a-ttachment element 5 prevents any lifting of the jaws 24, Although the disclosuredescribes and .illustrates a pre-ferréd em~odiment of the invention, it is to be understood the invention is not restricted to this par-ticular em~odiment, ~0 3~
Claims (7)
1. A device for preventing walk-planks secured by means of jaws to scaffolding cross-brackets from lifting wherein said cross-brackets have a U-shaped cross-section, provided with at least one elongated hole in a webbing running in the direction of the longitudinal axes of the brackets, and are secured to vert-ical members of said scaffolding which comprises a rail adapted to be laid over said jaws, said rail including at least one hook-shaped attachment element adapted to fit through a respective one of said at least one elongated hole and a plate pivotally secured to one end of said rail.
2. A device as claimed in claim 1 wherein said plate is secured to one end of said rail by means of a hinge.
3. A device as claimed in claim 1 wherein said cross-brackets are permanently secured to the vertical members of the scaffolding.
4. A device as claimed in claim 1 wherein said cross-brackets are adjustably secured to the vertical members of the scaffolding.
5. A device as claimed in claim 1 wherein the lower end of said attachment element is bent at right angles such that it points away from the end of the rail fitted with said plate.
6. A device as claimed in claim 1 wherein the end of the rail opposite to said end fitted with said plate is provided with an elongated, axially-aligned slot and said plate is fitted with a similar opening.
7. A device as claimed in claim 5 wherein the distance between the lower surface of said rail and the upper surface of the bent part of the attachment element corresponds to the distance between the lower surface of the rail and the outer surface of the web of the cross-bracket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000383959A CA1164512A (en) | 1981-08-14 | 1981-08-14 | Safety device to prevent the lifting of scaffolding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000383959A CA1164512A (en) | 1981-08-14 | 1981-08-14 | Safety device to prevent the lifting of scaffolding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1164512A true CA1164512A (en) | 1984-03-27 |
Family
ID=4120711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000383959A Expired CA1164512A (en) | 1981-08-14 | 1981-08-14 | Safety device to prevent the lifting of scaffolding |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1164512A (en) |
-
1981
- 1981-08-14 CA CA000383959A patent/CA1164512A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |