Title of Invention	A BEAM FOR A SUSPENDED CEILING
Abstract	A balanced single- layered web beam (Fig. 2) for a suspended celling and a method of making the said beam wherein the binding (40) in the said beam runs longitudinally along the web (22) and binds second flange (23) and first flange (25) of the beam together, thereby cantilevering the second flange (23) from the first flange (25) along the bottom of the web (22), as a result, the resultant load of an equal vertical load on the flanges passes directly through the vertical plane of the single-layered web, thereby balancing the said single-layered web beam and resisting twisting and bending of the said beam, equivalent to a comparably sized two-layered web beam, but with the use of less metal.

Title of Invention

A BEAM FOR A SUSPENDED CEILING

Abstract

A balanced single- layered web beam (Fig. 2) for a suspended celling and a method of making the said beam wherein the binding (40) in the said beam runs longitudinally along the web (22) and binds second flange (23) and first flange (25) of the beam together, thereby cantilevering the second flange (23) from the first flange (25) along the bottom of the web (22), as a result, the resultant load of an equal vertical load on the flanges passes directly through the vertical plane of the single-layered web, thereby balancing the said single-layered web beam and resisting twisting and bending of the said beam, equivalent to a comparably sized two-layered web beam, but with the use of less metal.

Full Text	BALANCED SINGLE-LAYERED WEB BEAM FOR A SUSPENDED CEILING FIELD OF THE INVENTION This invention relates to balanced single-layered web beam for a suspended ceiling that forms a grid in a suspended ceiling. The beams support either panels laid on top of the flanges of the beams, or drywall sheets attached at the bottom of the flanges of the beams. PRIOR ART Beams used in grids for suspended ceilings of either the panel or drywall type are well known. Such beams, which are similar for both types of ceilings, are formed into an inverted T cross section by continuously passing a strip of metal through rollers that fold the strip longitudinally. The beams carry a vertical load on the flanges only. To avoid twisting and bending in tee beams under such vertical load on the flanges in suspended ceilings, beams symmetrical in cross section are used, so that the beam is loaded in the plane of the web. In the prior art, this is done with a double-layered web, having a flange cantilevered from each layer of the web, wherein the flanges oppose one another horizontally. Beams with a single-layered web have been tried, in an attempt to produce a beam that uses less metal. In such a beam that has a single-layered web, only a single flange is cantilevered from the web. An opposing flange is cantilevered from the first formed flange. Such a beam is unbalanced under a vertical load on both flanges, and is subject to twisting and bending, since it is not loaded in the plane of the web. In U.S. Patent Re 31,528, incorporated herein by reference, such problems with single-layered webs are discussed with reference to Figure 7 of the patent. In U.S. Patent 4,520,609, attempts were made to balance the cross section of a applied at a distance away from the single-layered web, resulting in an unbalanced beam subject to bending and twisting that is not present in the balanced beam of Figure 3. In Figure 5, which shows the basic single-layered web beam 20 of the invention, again, as in the prior art, the beam 20 is vertically loaded on the flanges 23 and 25, in the suspended ceiling, as shown by vectors 26 and 27. However, seam 40 binds flange 23 to flange 27 along web 22, so that in effect both flanges 23 and 25 are cantilevered from web 22, resulting in a balanced beam. Load resultant 32 passes through the plane of the web, so that the single-layered beam of the invention resists twisting and bending equivalent to a comparably sized two-layered web beam, as seen in Figure 3, but with the use of less metal. single-layered web beam by adding more material to the top and bottom of the beam on opposite sides of the web. In U.S. Patent 4,713,919, a beam having a web with a full first layer, and a partial second layer, is disclosed. In U.S. Patent 5,979,055, incorporated herein by reference, a beam having a web that is formed partially of one layer, is pieced together. Such prior art beams with a full, or partial, single-layered web were unbalanced and lacked the necessary strength and stiffness to support the loads, unless more and heavier material was used than in a double-layered web beam. This defeated the desire to use a single-layered web beam with its promise of the use of less metal to make the beam. Virtually all beams for suspended ceilings continue to have a double-layered web. BRIEF DESCRIPTION OF THE INVENTION A balanced beam for a suspended ceiling is formed with a single-layered web that has one flange bent and cantilevered from the bottom of the web, and a second, opposite flange, that is cantilevered from close to the web by a seam that secures the first and second flanges together close to the web. The seam is preferably formed by continuous stitching as the beam is being rollformed, as seen, for instance, in the '055 patent. Other forms of binding, such as spot, or continuous, welding, as well as adhesives, may be used to form the seam. Such a beam in cross section is balanced, and acts to load the beam in the plane of the web, so that any twisting or bending in a beam having a single-layered web is substantially eliminated. The seam also binds the flanges themselves together to produce a bottom member at the base of the single-layered web that stiffens the web itself. Such a single-layered web beam with a seam in the flanges along the web that binds the flanges together near the bottom of web, so that both flanges are cantilevered from the web, provides the equivalent strength and rigidity of a double-layered web formed of the same thickness of strip metal, but without using a second layer of the metal in the web, so there is less metal needed to make the beam. BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING Figure 1 is a partial perspective view of the basic single-layered web beam of the invention, taken from above. Figure 2 is a partial perspective view of the beam of Figure 1, taken from below. Figure 3 is a cross sectional view of a prior art beam with a double-layered web. Figure 4 is a cross sectional view of a prior art beam with a single-layered web. Figure 5 is a cross sectional view of the beam of the invention. DETAILED DESCRIPTION OF THE INVENTION Beams 20 for suspended ceilings are shown in Figures 1 through 5. Such beams include the prior art beams shown in Figures 3 and 4, and the single-layered web beam of the invention shown in Figures 1, 2, and 5. Beams 20 have a bulb 21 at the top of a web 22. Opposing flanges 23 and 25 extend horizontally away from the web at the bottom of the beam. The vertical panel load, or vertical drywall load, on the beams in a suspended ceiling, is indicated in Figures 3 through 5 by vectors that represent the amount, location, and direction of the load exerted by the panels or drywall in a suspended ceiling. The load on each flange is indicated by numbers 26 and 27 on the prior art beams shown in Figures 3 and 4, and on the beam of the invention 20 shown in Figure 5. The prior art beam 20 shown in Figure 3 has a two-layered web 22, with each of the flanges 23 and 25 cantilevered from one of the layers of the web 22. The beam is symmetrical, and hence balanced, in cross section. The prior art beam 20 shown in Figure 4 has a single-layered web 22 with a flange 25 cantilevered from the bottom of the web 22, to the right, and then a second opposing flange 23 cantilevered from flange 25 at location 29, in a direction to the left. The basic single-layered web beam 20 of the invention, as seen in Figures 1, 2, and 5, has a single-layered web 22, with the flanges formed as in the prior art beam 20 of Figure 4. The basic single-layered web beam 20 of the invention also has a seam 40 that runs longitudinally along the web 22 of the beam, that binds flanges 23 and 25 together, so that flange 23 is cantilevered from flange 25 along web 22. The seam 40 is preferably made as the beam is being continuously rollformed, as by stitching. A form of stitching is disclosed in U.S patent '055 cited above. A seam 40 could also be formed by continuous or spot welding, or by adhesives. Seam 40, in effect, cantilevers the flange 23 from the single-layered web 22 of the basic beam of the invention 20, so that the result is a balanced beam that is loaded through the plane of the single-layered web 22. Such basic beam 20 of the invention resists twisting and bending to an extent equivalent to that of a double-layered web beam of a comparable size made of the same thickness metal strip, as seen for instance in Figure 3. The beam of the invention however, uses less metal. In Figures 3, 4, and 5 of the drawings, the loading of the beams 20, both prior art, and of the invention, is shown through the use of vectors. In Figure 3, load vectors 26 and 27 represent the vertical loading on each of the flanges 23 and 25 of a double-layered prior beam 20, in either a panel or a drywall suspended ceiling. The resultant load vector 30 of vectors 26 and 27 of such prior art double-layered web beam passes through the plane of web 22, since the beam is balanced. Such balanced beam creates a maximum resistance to bending and twisting. In Figure 4, there is shown the single-layered beam of the prior art. Again, as in Figure 3, the vectors 26 and 27 represent the loads applied to the beams, either through panel, or drywall, loads. However, because of the beam construction wherein flange 23 is cantilevered from flange 27 at location 29, the resultant load vector 31 is shown applied at a distance away from the single-layered web, resulting in an unbalanced beam subject to bending and twisting that is not present in the balanced beam of Figure 3. In Figure 5, which shows the basic single-layered web beam 20 of the invention, again, as in the prior art, the beam 20 is vertically loaded on the flanges 23 and 25, in the suspended ceiling, as shown by vectors 26 and 27. However, seam 40 binds flange 23 to flange 27 along web 22, so that in effect both flanges 23 and 25 are cantilevered from web 22, resulting in a balanced beam. Load resultant 32 passes through the plane of the web, so that the single-layered beam of the invention resists twisting and bending equivalent to a comparably sized two-layered web beam, as seen in Figure 3, but with the use of less metal. WE CLAIM; 1. A balanced single- layered web beam for a suspended ceiling, wherein the beam is formed from a strip of metal folded longitudinally into a cross section having a) a bulb (21) at the top b) a vertical single-layered web (22) extending downward from the bulb c) a first flange (25) cantilevered horizontally from the bottom of the web in the first direction d) a second flange (23) cantilevered horizontally from the first flange (25) in a second direction opposite to the first direction, and e) the binding (40) between the two flanges characterized in that the binding (40) in the said beam runs longitudinally along the web (22) and binds second flange (23) and first flange (25) of the beam together, thereby cantilevering the second flange (23) from the first flange (25) along the bottom of the web (22), and as a result of that, the resultant load (32) of an equal vertical load (26, 27) on the flanges passes directly through the vertical plane of the single-layered web, thereby balancing the said single-layered web beam and resisting twisting and bending of the said beam, equivalent to a comparably sized two-layered web beam, but with the use of less metal. 2. Beam as claimed in claim 1 wherein the binding is formed by a seam of stitches. 3. Beam as claimed in claim 1 wherein the binding is formed by a seam by continuous or spot welding, or by adhesive. 4. Beam as claimed in claim 1 wherein the binding stiffens the web. 5. Method of making balanced single layered web beam as claimed in claim 1 by a binding(40) that runs longitudinally along the web (22) and binds second flange (23) and first flange (25) of the beam together, thereby cantilevering the second flange (23) from the first flange (25) along the bottom of the web (22), as a result, the resultant load (32) of an equal vertical load (26, 27) on the flanges passes directly through the vertical plane of the single-layered web, thereby balancing the said single-layered web beam and resisting twisting and bending of the said beam, equivalent to a comparably sized two-layered web beam, but with the use of less metal. 6. Method as claimed in claim 5 wherein the binding is formed by a seam of stitches. 7. Method as claimed in claim 5 wherein the binding is formed by a seam by continuous or spot welding, or by adhesive. 8. Method as claimed in claim 5 wherein the binding stiffens the web.

Full Text

BALANCED SINGLE-LAYERED WEB BEAM FOR A SUSPENDED CEILING
FIELD OF THE INVENTION
This invention relates to balanced single-layered web beam for a suspended ceiling that forms a grid in a suspended ceiling. The beams support either panels laid on top of the flanges of the beams, or drywall sheets attached at the bottom of the flanges of the beams.
PRIOR ART
Beams used in grids for suspended ceilings of either the panel or drywall type are well known. Such beams, which are similar for both types of ceilings, are formed into an inverted T cross section by continuously passing a strip of metal through rollers that fold the strip longitudinally.
The beams carry a vertical load on the flanges only. To avoid twisting and bending in tee beams under such vertical load on the flanges in suspended ceilings, beams symmetrical in cross section are used, so that the beam is loaded in the plane of the web. In the prior art, this is done with a double-layered web, having a flange cantilevered from each layer of the web, wherein the flanges oppose one another horizontally.
Beams with a single-layered web have been tried, in an attempt to produce a beam that uses less metal. In such a beam that has a single-layered web, only a single flange is cantilevered from the web. An opposing flange is cantilevered from the first formed flange. Such a beam is unbalanced under a vertical load on both flanges, and is subject to twisting and bending, since it is not loaded in the plane of the web.
In U.S. Patent Re 31,528, incorporated herein by reference, such problems with single-layered webs are discussed with reference to Figure 7 of the patent.
In U.S. Patent 4,520,609, attempts were made to balance the cross section of a
applied at a distance away from the single-layered web, resulting in an unbalanced beam subject to bending and twisting that is not present in the balanced beam of Figure 3.
In Figure 5, which shows the basic single-layered web beam 20 of the invention, again, as in the prior art, the beam 20 is vertically loaded on the flanges 23 and 25, in the suspended ceiling, as shown by vectors 26 and 27. However, seam 40 binds flange 23 to flange 27 along web 22, so that in effect both flanges 23 and 25 are cantilevered from web 22, resulting in a balanced beam. Load resultant 32 passes through the plane of the web, so that the single-layered beam of the invention resists twisting and bending equivalent to a comparably sized two-layered web beam, as seen in Figure 3, but with the use of less metal.
single-layered web beam by adding more material to the top and bottom of the beam on opposite sides of the web.
In U.S. Patent 4,713,919, a beam having a web with a full first layer, and a partial second layer, is disclosed.
In U.S. Patent 5,979,055, incorporated herein by reference, a beam having a web that is formed partially of one layer, is pieced together.
Such prior art beams with a full, or partial, single-layered web were unbalanced and lacked the necessary strength and stiffness to support the loads, unless more and heavier material was used than in a double-layered web beam. This defeated the desire to use a single-layered web beam with its promise of the use of less metal to make the beam. Virtually all beams for suspended ceilings continue to have a double-layered web.
BRIEF DESCRIPTION OF THE INVENTION
A balanced beam for a suspended ceiling is formed with a single-layered web that has one flange bent and cantilevered from the bottom of the web, and a second, opposite flange, that is cantilevered from close to the web by a seam that secures the first and second flanges together close to the web.
The seam is preferably formed by continuous stitching as the beam is being rollformed, as seen, for instance, in the '055 patent. Other forms of binding, such as spot, or continuous, welding, as well as adhesives, may be used to form the seam.
Such a beam in cross section is balanced, and acts to load the beam in the plane of the web, so that any twisting or bending in a beam having a single-layered web is substantially eliminated.
The seam also binds the flanges themselves together to produce a bottom member at the base of the single-layered web that stiffens the web itself.
Such a single-layered web beam with a seam in the flanges along the web that binds the flanges together near the bottom of web, so that both flanges are cantilevered
from the web, provides the equivalent strength and rigidity of a double-layered web formed of the same thickness of strip metal, but without using a second layer of the metal in the web, so there is less metal needed to make the beam.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING
Figure 1 is a partial perspective view of the basic single-layered web beam of the invention, taken from above.
Figure 2 is a partial perspective view of the beam of Figure 1, taken from below.
Figure 3 is a cross sectional view of a prior art beam with a double-layered web.
Figure 4 is a cross sectional view of a prior art beam with a single-layered web.
Figure 5 is a cross sectional view of the beam of the invention.
DETAILED DESCRIPTION OF THE INVENTION
Beams 20 for suspended ceilings are shown in Figures 1 through 5. Such beams include the prior art beams shown in Figures 3 and 4, and the single-layered web beam of the invention shown in Figures 1, 2, and 5. Beams 20 have a bulb 21 at the top of a web 22. Opposing flanges 23 and 25 extend horizontally away from the web at the bottom of the beam.
The vertical panel load, or vertical drywall load, on the beams in a suspended ceiling, is indicated in Figures 3 through 5 by vectors that represent the amount, location, and direction of the load exerted by the panels or drywall in a suspended ceiling. The load on each flange is indicated by numbers 26 and 27 on the prior art beams shown in Figures 3 and 4, and on the beam of the invention 20 shown in Figure 5.
The prior art beam 20 shown in Figure 3 has a two-layered web 22, with each of the flanges 23 and 25 cantilevered from one of the layers of the web 22. The beam is symmetrical, and hence balanced, in cross section.
The prior art beam 20 shown in Figure 4 has a single-layered web 22 with a
flange 25 cantilevered from the bottom of the web 22, to the right, and then a second opposing flange 23 cantilevered from flange 25 at location 29, in a direction to the left.
The basic single-layered web beam 20 of the invention, as seen in Figures 1, 2, and 5, has a single-layered web 22, with the flanges formed as in the prior art beam 20 of Figure 4. The basic single-layered web beam 20 of the invention also has a seam 40 that runs longitudinally along the web 22 of the beam, that binds flanges 23 and 25 together, so that flange 23 is cantilevered from flange 25 along web 22.
The seam 40 is preferably made as the beam is being continuously rollformed, as by stitching. A form of stitching is disclosed in U.S patent '055 cited above. A seam 40 could also be formed by continuous or spot welding, or by adhesives.
Seam 40, in effect, cantilevers the flange 23 from the single-layered web 22 of the basic beam of the invention 20, so that the result is a balanced beam that is loaded through the plane of the single-layered web 22. Such basic beam 20 of the invention resists twisting and bending to an extent equivalent to that of a double-layered web beam of a comparable size made of the same thickness metal strip, as seen for instance in Figure 3. The beam of the invention however, uses less metal.
In Figures 3, 4, and 5 of the drawings, the loading of the beams 20, both prior art, and of the invention, is shown through the use of vectors.
In Figure 3, load vectors 26 and 27 represent the vertical loading on each of the flanges 23 and 25 of a double-layered prior beam 20, in either a panel or a drywall suspended ceiling. The resultant load vector 30 of vectors 26 and 27 of such prior art double-layered web beam passes through the plane of web 22, since the beam is balanced. Such balanced beam creates a maximum resistance to bending and twisting.
In Figure 4, there is shown the single-layered beam of the prior art. Again, as in Figure 3, the vectors 26 and 27 represent the loads applied to the beams, either through panel, or drywall, loads. However, because of the beam construction wherein flange 23 is cantilevered from flange 27 at location 29, the resultant load vector 31 is shown
applied at a distance away from the single-layered web, resulting in an unbalanced beam subject to bending and twisting that is not present in the balanced beam of Figure 3.
In Figure 5, which shows the basic single-layered web beam 20 of the invention, again, as in the prior art, the beam 20 is vertically loaded on the flanges 23 and 25, in the suspended ceiling, as shown by vectors 26 and 27. However, seam 40 binds flange 23 to flange 27 along web 22, so that in effect both flanges 23 and 25 are cantilevered from web 22, resulting in a balanced beam. Load resultant 32 passes through the plane of the web, so that the single-layered beam of the invention resists twisting and bending equivalent to a comparably sized two-layered web beam, as seen in Figure 3, but with the use of less metal.

WE CLAIM;
1. A balanced single- layered web beam for a suspended ceiling, wherein
the beam is formed from a strip of metal folded longitudinally into a cross
section having
a) a bulb (21) at the top
b) a vertical single-layered web (22) extending downward from the bulb
c) a first flange (25) cantilevered horizontally from the bottom of the web in the first direction
d) a second flange (23) cantilevered horizontally from the first flange (25) in a second direction opposite to the first direction, and
e) the binding (40) between the two flanges
characterized in that the binding (40) in the said beam runs longitudinally along the web (22) and binds second flange (23) and first flange (25) of the beam together, thereby cantilevering the second flange (23) from the first flange (25) along the bottom of the web (22), and as a result of that, the resultant load (32) of an equal vertical load (26, 27) on the flanges passes directly through the vertical plane of the single-layered web, thereby balancing the said single-layered web beam and resisting twisting and bending of the said beam, equivalent to a comparably sized two-layered web beam, but with the use of less metal.
2. Beam as claimed in claim 1 wherein the binding is formed by a seam of stitches.
3. Beam as claimed in claim 1 wherein the binding is formed by a seam by continuous or spot welding, or by adhesive.
4. Beam as claimed in claim 1 wherein the binding stiffens the web.
5. Method of making balanced single layered web beam as claimed in claim 1 by a binding(40) that runs longitudinally along the web (22) and binds second flange (23) and first flange (25) of the beam together, thereby cantilevering the second flange (23) from the first flange (25) along the bottom of the web (22), as a result, the resultant load (32) of an equal vertical load (26, 27) on the flanges passes directly through the vertical plane of the single-layered web, thereby balancing the said single-layered web beam and resisting twisting and bending of the said beam, equivalent to a comparably sized two-layered web beam, but with the use of less metal.
6. Method as claimed in claim 5 wherein the binding is formed by a seam of stitches.
7. Method as claimed in claim 5 wherein the binding is formed by a seam by continuous or spot welding, or by adhesive.
8. Method as claimed in claim 5 wherein the binding stiffens the web.

Documents:

4074-DELNP-2007-Abstract-(19-01-2012).pdf

4074-delnp-2007-abstract.pdf

4074-delnp-2007-assignment.pdf

4074-DELNP-2007-Claims-(13-06-2013).pdf

4074-DELNP-2007-Claims-(19-01-2012).pdf

4074-delnp-2007-claims.pdf

4074-DELNP-2007-Correspondence Others-(19-01-2012).pdf

4074-DELNP-2007-Correspondence-Others-(13-06-2013).pdf

4074-delnp-2007-correspondence-others-1.pdf

4074-delnp-2007-correspondence-others.pdf

4074-DELNP-2007-Description (Complete)-(19-01-2012).pdf

4074-delnp-2007-description (complete).pdf

4074-DELNP-2007-Drawings-(19-01-2012).pdf

4074-delnp-2007-drawings.pdf

4074-DELNP-2007-Form-1-(13-06-2013).pdf

4074-delnp-2007-form-1.pdf

4074-delnp-2007-form-18.pdf

4074-DELNP-2007-Form-2-(13-06-2013).pdf

4074-DELNP-2007-Form-2-(19-01-2012).pdf

4074-delnp-2007-form-2.pdf

4074-DELNP-2007-Form-3-(13-06-2013).pdf

4074-delnp-2007-form-3.pdf

4074-DELNP-2007-Form-5-(19-01-2012).pdf

4074-delnp-2007-form-5.pdf

4074-DELNP-2007-GPA-(13-06-2013).pdf

4074-DELNP-2007-Petition-137-(19-01-2012).pdf

4074-DELNP-2007-Petition-138-(19-01-2012).pdf

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Patent Number

257531

Indian Patent Application Number

4074/DELNP/2007

PG Journal Number

42/2013

Publication Date

18-Oct-2013

Grant Date

11-Oct-2013

Date of Filing

30-May-2007

Name of Patentee

WORTHINGTON ARMSTRONG VENTURE

Applicant Address

WORTHINGTON ARMSTRONG VENTURE,9 OLD LINCOLN HIGHWAY, SUITE 200,MALVERN,PA 19355,U.S.A.

Inventors:

#	Inventor's Name	Inventor's Address
1	PLATT JOHN WILLIAM	3000 FRANSISCAN WAY ASTON,PA 19014,U.S.A.

PCT International Classification Number

E06B 1/00

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	11/446,729	2006-06-05	U.S.A.