CA2467531A1 - Roof truss chord and apparatus and process for forming same - Google Patents
Roof truss chord and apparatus and process for forming same Download PDFInfo
- Publication number
- CA2467531A1 CA2467531A1 CA 2467531 CA2467531A CA2467531A1 CA 2467531 A1 CA2467531 A1 CA 2467531A1 CA 2467531 CA2467531 CA 2467531 CA 2467531 A CA2467531 A CA 2467531A CA 2467531 A1 CA2467531 A1 CA 2467531A1
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- CA
- Canada
- Prior art keywords
- end portion
- roof truss
- truss chord
- elongate sheet
- portions
- 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.)
- Abandoned
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C3/06—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web
- E04C3/07—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web at least partly of bent or otherwise deformed strip- or sheet-like material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
- B21D5/08—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles making use of forming-rollers
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
- E04C2003/0408—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section
- E04C2003/0421—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section comprising one single unitary part
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
- E04C2003/0426—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section
- E04C2003/0434—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section the open cross-section free of enclosed cavities
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
- E04C2003/0443—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
- E04C2003/0473—U- or C-shaped
Abstract
A roof truss chord formed according to the present invention has a substantially "U"-shaped cross-section portion defined by a central base portion, and two opposed outer side portions extending from the central base portion. Each of the outer side portions has a base end portion and a remote end portion. The roof truss chord also has two lateral web portions, each respectively extending in an outward direction from a different one of the opposed side portions adjacent its remote end portion. Each of the lateral web portions has an inward end portion and an outward end portion. The roof truss chord also has two lip portions, each respectively extending substantially perpendicularly from a different one of the lateral web portions adjacent its outward end portion.
Description
ROOF TRUSS CHORD AND
APPARATUS AND PROCESS FOR FORMING SAME
FIE?~D OF THE TNVENTION
[0001] The present invention relates to a roof truss chord and to an apparatus and process for forming same, and more particularly to a high strength elongate roof truss chord and to an apparatus and process for forming same.
BACKGROUND OF THE INVENTION
APPARATUS AND PROCESS FOR FORMING SAME
FIE?~D OF THE TNVENTION
[0001] The present invention relates to a roof truss chord and to an apparatus and process for forming same, and more particularly to a high strength elongate roof truss chord and to an apparatus and process for forming same.
BACKGROUND OF THE INVENTION
[0002] In the prior art, industrial roof trusses have been built from heavy steel angle and re-bar steel (as shown in Figures 15 and 16). Such prior art industrial roof trusses have been quite costly because of their usage of solid steel.
[0003] It is an object of the invention to provide a roof truss chord.
[0004] It is a further object of the invention to provide an apparatus and process for forming a roof truss chord.
[OOOS] It is another object of the invention to provide an apparatus and process for forming a roof truss chord wherein an elongate sheet is passed through a series of tooling sets.
[0006] It is still another object of the invention to provide an apparatus and process for forming a roof truss chord wherein an elongate sheet is passed through a series of tooling sets, with each of the tooling sets respectively comprised of a roll form assembly and a mating channel portion.
[0007] It is another object of the invention to provide a process and apparatus for the pre-fabrication of trusses using light-weight steel materials.
[0008] It is a further object of the invention to provide tooling necessary for the fabrication of light-weight steel trusses.
[0009] It is yet another object of the invention to provide a high strength roof truss chord.
[0010] It is still another object of the present invention to provide an elongate roof truss chord that is able to span a distance between two bearing walls.
[0011] It is a still further object of the present invention to provide an elongate roof truss chord that is able to span a distance in the order of approximately seventy-five feet between two bearing walls.
[-0012] It is still yet another object of the present invention to provide a roof truss chord that provides significant savings in steel, concrete and labour costs.
SUt~IARY OF THE INVENTION
[0013] In accordance with the present invention, there is disclosed a roof truss chord having a substantially "U"-shaped cross section defined by a lower central base portion and two opposed upper side edge portions. Each of the side edge portions has a top portion with a respective upper lateral web portion extending therefrom in a substantially outward direction. Each respective upper lateral web portion has an outside portion with a respective lip portion extending therefrom in a substantially downward direction.
[0014] In accordance with another aspect of the invention, there is disclosed a roof truss chord comprising a substantially "U"-shaped cross-section portion defined by a central base portion, and two opposed outer side portions extending from the central base portion, with each of the outer side portions having a base end portion and a remote end portion. The roof truss chord further comprises two lateral web portions, each respectively extending in a substantially outward direction from a different one of the opposed side portions adjacent its remote end portion, with each of the lateral web portions having an inward end portion and an outward end portion. Still further, the roof truss chord comprises two lip portions, each respectively extending substantially perpendicularly from a different one of the lateral web portions adjacent its outward end portion.
[0015] In accordance with another aspect of the present invention, there is disclosed an apparatus for forming a roof truss chord comprising a series of tooling sets, each adapted for passing an elongate sheet therethrough, with each of the tooling sets respectively comprising a roll form assembly and a mating channel portion.
[0016] In accordance with a still further aspect of the invention, there is disclosed an apparatus for forming a roof truss chord comprising a series of twelve tooling sets, each adapted for passing an elongate sheet therethrough, and with each of the twelve tooling sets respectively comprising a roll form assembly and a mating channel portion.
[0017] In accordance with another aspect of the invention, the apparatus is particularly adapted such that passage of the elongate sheet through each successive one of the tooling sets progressively forms the roof truss chord.
[0018] In accordance with still another aspect of the invention, there is disclosed a process for forming a roof truss chord comprising the step of passing an elongate sheet through a first tooling set comprising a first roll form assembly and a mating first channel portion, wherein the elongate sheet is passed between the first roll form assembly and the first channel portion. The process further comprises the final step of passing the elongate sheet through a last tooling set comprising a last roll form assembly and a mating last channel portion, wherein the elongate sheet is passed between the last roll form assembly and the last channel portion, with the last roll form assembly and the last channel portion defining a cross-sectional aperture therebetween. The cross-sectional aperture has a substantially "U"-shaped cross-section portion defined by a central base portion and two opposed outer side portions extending from the central base portion, with each of the outer side portions having a base end portion and a remote end portion. The cross-sectional aperture also has two lateral web portions, each respectively extending in a substantially outward direction from a different one of the opposed side portions adjacent its remote end portion, with each of the lateral web portions having an inward end portion and an outward end portion. The cross-sectional aperture still further has two lip portions, each respectively extending substantially perpendicularly from a different one of the lateral web portions adjacent its outward end portion. The roof truss chord is formed upon passage of the elongate sheet through the last tooling set.
[0019] In accordance with another aspect of the invention, the process also includes the step of successively passing the elongate sheet through a series of ten intermediate tooling sets, each comprising an intermediate roll form assembly and a mating intermediate first channel portion, wherein the elongate sheet is successively passed between each intermediate roll form assembly and the mating intermediate channel portion.
[0020] In accordance with a further aspect of the present invention, there is disclosed a roof truss chord which is suitable for use as either a top or a bottom roof truss chord.
[0021] The use of the roof truss chord of the present invention makes roof trusses much stronger. This strength provides us with the opportunity to create a much longer span between two bearing walls. With this chord method, a span in the order of approximately seventy-five feet may be created. Therefore, there are significant savings in steel, concrete and labour costs.
[0022] Other advantages, features and characteristics of the present invention, as well as methods of operation and functions of the related elements of the structure, and the combination of parts and economies of manufacture, will become more apparent upon consideration of the following detailed description and the appended claims with reference to the accompanying drawings, the latter of which is briefly described hereinbelow.
BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 of the drawings appended hereto is a front elevational view of a roof truss chord formed according to the invention;
[0024] Figure 2 is a front elevational view of a first tooling set of an apparatus formed according to the invention:
[0025] Figure 3 is a similar view of a second tooling set;
[0026] Figure 4 is a similar view of a third tooling set;
_ g _ [0027] Figure 5 is a similar view of a fourth tooling set;
[0028] Figure 6 is a similar view of a fifth tooling set;
[0029) Figure 7 is a similar view of a sixth tooling set;
[0030] Figure 8 is a similar view of a seventh tooling set;
[0031) Figure 9 is a similar view of an eighth tooling set;
[0032] Figure 10 is a similar view of a ninth tooling set;
[0033] Figure 11 is a similar view of a tenth tooling set;
[0034] Figure 12 is a similar view of an eleventh tooling set;
[0035] Figure 13 is a similar view of a last tooling set;
[0036] Figure 14 is a side elevational view of a roof truss formed according to the invention;
[0037] Figure 15 is a front elevational view of a prior art roof truss:
[0038] Figure 16 is a side elevational view of the prior art roof truss of Figure 15; and [0039] Figure 17 is a bottom perspective view of a rigid framework for roof formed according to the invention.
DETAILED DESCRIPTION OF A PREFERRED E1~ODIMENT
[0040] In the prior art, and as shown in Figures 15 and 16, roof trusses 30 have heretofore been built from heavy steel angle 32 and re-bar steel 34. Such prior art roof trusses 30 have been quite costly, at least in part because of their usage of solid steel.
[0041] With reference now to Figure l, there is shown a roof truss chord 20 that is formed according to the present invention.
As best seen in Figure l, the chord 20 has a substantially "U"-shaped cross section defined by a lower central base portion 22 and two opposed upper side edge portions 24. Each of the side edge portions 24 has a top portion 24a with a respective upper lateral web portion 26 extending therefrom in a substantially outward direction (as indicated by arrows "A1" and "AZ" in Figure 1). Each respective lateral web portion 26 has an outside portion 26a with a respective lip portion 28 extending therefrom in a substantially downward direction (as indicated by arrow "B" in Figure 1). The roof truss chord of the present invention is preferably formed from galvanized steel sheets or strips.
[0042] At this point, it should perhaps be noted that the various dimensions, orientations and materials specified the drawings are exemplary of dimensions, orientations and materials which fall within acceptable parameters, according to the invention, and it will be appreciated by those skilled in the art that other dimensions, orientations and materials may be used in the design and manufacture of the roof truss chord and apparatus and process for forming same according to the present invention without departing from its spirit and scope. Hereinafter, the roof truss chord 20 may alternately be referred to either as a truss channel profile (as best seen in Figure 1), or simply as a chord.
[0043] As best seen in Figures 14 and 17, two roof truss chords 20 according to the invention, namely, a bottom chord 20a and a top chord 20b, may be used with steel ribs 38 welded therebetween in a criss-cross formation. In this manner, and as best seen in Figure 17, the steel ribs 38 may be assembled together with the roof truss chords 20 so as to form a rigid framework 40 for a roof.
[0044] According to the invention, the roof truss chord 20 is preferably formed by passing a galvanized steel elongate sheet 42 or strip through a series of twelve tooling sets, 51 through 62.
According to a preferred embodiment of the invention, first through last tooling sets, 51 through 62, for forming the chord 20 are shown in Figures 2 through 13.
[0045] The first tooling set 51 is shown in Figure 2 and includes a first roll former assembly 51a and a mating first channel portion 51b. The elongate sheet 42 is first pressed between the first roll former assembly 51a and the mating first channel portion 51b.
[0046] After being partially formed by the first tooling set 51, the elongate sheet 42 is then further formed by a second tooling set 52 (shown in Figure 3). The second tooling set 52 includes a second roll former assembly 52a and a mating second channel portion 52b.
The elongate sheet 42 is further pressed between the second roll former assembly 52a and the mating second channel portion 52b.
[0047] Next, the elongate sheet 42 is still further formed by passing through a third tooling set 53 (shown in Figure 4). The elongate sheet 42 is pressed between a third roll former assembly 53a and a mating third channel portion 53b of the third tooling set 53.
[0048] After being formed as aforesaid by the third tooling set 53, the elongate sheet 42 is passed through a fourth tooling set 54 (shown in Figure 5). The fourth tooling set 54 includes a fourth roll former assembly 54a and a mating fourth channel portion 54b.
The elongate sheet 42 is pressed between the fourth roll former assembly 54a and the mating fourth channel portion 54b.
[0049] Next, the elongate sheet 42 passes through a fifth tooling set 55 (shown in Figure 6), which includes a fifth roll former assembly 55a and a mating fifth channel portion 55b. As with the other tooling sets, the elongate sheet 42 is pressed between the fifth roll former assembly 55a and the mating fifth channel portion 55b.
[0050] The elongate sheet 42 is then moved from the fifth tooling set 55 to a sixth tooling set 56 (shown in Figure 7), which includes a sixth roll former assembly 56a and a mating sixth channel portion 56b. The elongate sheet 42 is then pressed between the sixth roll former assembly 56a and the mating sixth channel portion 56b.
[0051] Thereafter, the elongate sheet 42 passes through a seventh tooling set 57 (shown in Figure 8), which includes a seventh roll former assembly 57a and a mating seventh channel portion 57b. As with the other tooling sets, the elongate sheet 42 is pressed between the seventh roll former assembly 57a and the mating seventh channel portion 57b.
[0052] After passing as aforesaid through the seventh tooling set 57, the elongate sheet 42 is still further formed by an eighth tooling set 58 (shown in Figure 9). The eighth tooling set 58 includes an eighth roll former assembly 58a and a mating eighth channel portion 58b. The elongate sheet 42 is pressed between the eighth roll former assembly 58a and the mating eighth channel portion 58b.
[0053] Next, the elongate sheet 42 passes through a ninth tooling set 59 (shown in Figure 10), which includes a ninth roll former assembly 59a and a mating ninth channel portion 59b. As with the other tooling sets, the elongate sheet 42 is pressed between the ninth roll former assembly 59a and the mating ninth channel portion 59b.
[0054] The elongate sheet 42 is then moved from the ninth tooling set 59 to a tenth tooling set 60 (shown in Figure 11), which includes a tenth roll former assembly 60a and a mating tenth channel portion 60b. The elongate sheet 42 is then pressed between the tenth roll former assembly 60a and the mating tenth channel portion 60b.
[0055] Thereafter, the elongate sheet 42 passes through an eleventh tooling set 61 (shown in Figure 12), which includes an eleventh roll former assembly 61a and a mating eleventh channel portion 61b. As with the other tooling sets, the elongate sheet 42 is pressed between the eleventh roll former assembly 61a and the mating eleventh channel portion 61b.
[0056] Lastly, the elongate sheet 42 is finally passed between the last tooling set 62 (shown in Figure 13), which includes a last roll former assembly 62a and a mating last channel portion 62b.
After being pressed between the last roll former assembly 62a and the mating last channel portion 62b, a cross-sectional profile of the elongate sheet 42 is identical to that of the roof truss chord 20. The process for forming the roof truss chord 20 according to the invention is substantially complete once the entire sheet 42 has passed between last tooling set 62.
[0057] As such, the apparatus and process for forming the roof truss chord 20 according to the present invention will be seen to include the passage of an elongate sheet 42 through a series of tooling sets, each of tooling sets respectively comprised of a roll former assembly and a mating channel portion.
[0058] The process and apparatus for forming the roof truss chord 20, according to the present invention, is capable of forming a high strength elongate roof truss chord of the type shown in the drawings (as best seen in Figures 1, 14 and 17), and provides for the pre-fabrication of roof truss chords 20 and roof trusses using light-weight steel materials. The process and apparatus disclosed hereby provide the tooling necessary for the fabrication of light-weight steel roof truss chords and roof trusses.
[0059] According to the invention, the process and apparatus disclosed hereby are capable of producing roof truss chords 20 that span a distance in the order of approximately seventy-five feet between two bearing walls (not shown). The roof truss chord 20 formed according to the present invention provides significant savings in steel, concrete and labour costs.
[0060] The use of the roof truss chord 20 of the present invention makes roof trusses 40 much stronger. This strength provides the opportunity to create a much longer span between two bearing walls - in the order of approximately seventy-five feet -with significant savings in steel, concrete and labour costs.
[0061] Various other modifications and alterations may be used in the design and manufacture of the roof truss chord 20 and the apparatus and process for forming same, according to the present invention, without departing from the spirit and scope of the invention, which is limited only by the accompanying claims.
[OOOS] It is another object of the invention to provide an apparatus and process for forming a roof truss chord wherein an elongate sheet is passed through a series of tooling sets.
[0006] It is still another object of the invention to provide an apparatus and process for forming a roof truss chord wherein an elongate sheet is passed through a series of tooling sets, with each of the tooling sets respectively comprised of a roll form assembly and a mating channel portion.
[0007] It is another object of the invention to provide a process and apparatus for the pre-fabrication of trusses using light-weight steel materials.
[0008] It is a further object of the invention to provide tooling necessary for the fabrication of light-weight steel trusses.
[0009] It is yet another object of the invention to provide a high strength roof truss chord.
[0010] It is still another object of the present invention to provide an elongate roof truss chord that is able to span a distance between two bearing walls.
[0011] It is a still further object of the present invention to provide an elongate roof truss chord that is able to span a distance in the order of approximately seventy-five feet between two bearing walls.
[-0012] It is still yet another object of the present invention to provide a roof truss chord that provides significant savings in steel, concrete and labour costs.
SUt~IARY OF THE INVENTION
[0013] In accordance with the present invention, there is disclosed a roof truss chord having a substantially "U"-shaped cross section defined by a lower central base portion and two opposed upper side edge portions. Each of the side edge portions has a top portion with a respective upper lateral web portion extending therefrom in a substantially outward direction. Each respective upper lateral web portion has an outside portion with a respective lip portion extending therefrom in a substantially downward direction.
[0014] In accordance with another aspect of the invention, there is disclosed a roof truss chord comprising a substantially "U"-shaped cross-section portion defined by a central base portion, and two opposed outer side portions extending from the central base portion, with each of the outer side portions having a base end portion and a remote end portion. The roof truss chord further comprises two lateral web portions, each respectively extending in a substantially outward direction from a different one of the opposed side portions adjacent its remote end portion, with each of the lateral web portions having an inward end portion and an outward end portion. Still further, the roof truss chord comprises two lip portions, each respectively extending substantially perpendicularly from a different one of the lateral web portions adjacent its outward end portion.
[0015] In accordance with another aspect of the present invention, there is disclosed an apparatus for forming a roof truss chord comprising a series of tooling sets, each adapted for passing an elongate sheet therethrough, with each of the tooling sets respectively comprising a roll form assembly and a mating channel portion.
[0016] In accordance with a still further aspect of the invention, there is disclosed an apparatus for forming a roof truss chord comprising a series of twelve tooling sets, each adapted for passing an elongate sheet therethrough, and with each of the twelve tooling sets respectively comprising a roll form assembly and a mating channel portion.
[0017] In accordance with another aspect of the invention, the apparatus is particularly adapted such that passage of the elongate sheet through each successive one of the tooling sets progressively forms the roof truss chord.
[0018] In accordance with still another aspect of the invention, there is disclosed a process for forming a roof truss chord comprising the step of passing an elongate sheet through a first tooling set comprising a first roll form assembly and a mating first channel portion, wherein the elongate sheet is passed between the first roll form assembly and the first channel portion. The process further comprises the final step of passing the elongate sheet through a last tooling set comprising a last roll form assembly and a mating last channel portion, wherein the elongate sheet is passed between the last roll form assembly and the last channel portion, with the last roll form assembly and the last channel portion defining a cross-sectional aperture therebetween. The cross-sectional aperture has a substantially "U"-shaped cross-section portion defined by a central base portion and two opposed outer side portions extending from the central base portion, with each of the outer side portions having a base end portion and a remote end portion. The cross-sectional aperture also has two lateral web portions, each respectively extending in a substantially outward direction from a different one of the opposed side portions adjacent its remote end portion, with each of the lateral web portions having an inward end portion and an outward end portion. The cross-sectional aperture still further has two lip portions, each respectively extending substantially perpendicularly from a different one of the lateral web portions adjacent its outward end portion. The roof truss chord is formed upon passage of the elongate sheet through the last tooling set.
[0019] In accordance with another aspect of the invention, the process also includes the step of successively passing the elongate sheet through a series of ten intermediate tooling sets, each comprising an intermediate roll form assembly and a mating intermediate first channel portion, wherein the elongate sheet is successively passed between each intermediate roll form assembly and the mating intermediate channel portion.
[0020] In accordance with a further aspect of the present invention, there is disclosed a roof truss chord which is suitable for use as either a top or a bottom roof truss chord.
[0021] The use of the roof truss chord of the present invention makes roof trusses much stronger. This strength provides us with the opportunity to create a much longer span between two bearing walls. With this chord method, a span in the order of approximately seventy-five feet may be created. Therefore, there are significant savings in steel, concrete and labour costs.
[0022] Other advantages, features and characteristics of the present invention, as well as methods of operation and functions of the related elements of the structure, and the combination of parts and economies of manufacture, will become more apparent upon consideration of the following detailed description and the appended claims with reference to the accompanying drawings, the latter of which is briefly described hereinbelow.
BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 of the drawings appended hereto is a front elevational view of a roof truss chord formed according to the invention;
[0024] Figure 2 is a front elevational view of a first tooling set of an apparatus formed according to the invention:
[0025] Figure 3 is a similar view of a second tooling set;
[0026] Figure 4 is a similar view of a third tooling set;
_ g _ [0027] Figure 5 is a similar view of a fourth tooling set;
[0028] Figure 6 is a similar view of a fifth tooling set;
[0029) Figure 7 is a similar view of a sixth tooling set;
[0030] Figure 8 is a similar view of a seventh tooling set;
[0031) Figure 9 is a similar view of an eighth tooling set;
[0032] Figure 10 is a similar view of a ninth tooling set;
[0033] Figure 11 is a similar view of a tenth tooling set;
[0034] Figure 12 is a similar view of an eleventh tooling set;
[0035] Figure 13 is a similar view of a last tooling set;
[0036] Figure 14 is a side elevational view of a roof truss formed according to the invention;
[0037] Figure 15 is a front elevational view of a prior art roof truss:
[0038] Figure 16 is a side elevational view of the prior art roof truss of Figure 15; and [0039] Figure 17 is a bottom perspective view of a rigid framework for roof formed according to the invention.
DETAILED DESCRIPTION OF A PREFERRED E1~ODIMENT
[0040] In the prior art, and as shown in Figures 15 and 16, roof trusses 30 have heretofore been built from heavy steel angle 32 and re-bar steel 34. Such prior art roof trusses 30 have been quite costly, at least in part because of their usage of solid steel.
[0041] With reference now to Figure l, there is shown a roof truss chord 20 that is formed according to the present invention.
As best seen in Figure l, the chord 20 has a substantially "U"-shaped cross section defined by a lower central base portion 22 and two opposed upper side edge portions 24. Each of the side edge portions 24 has a top portion 24a with a respective upper lateral web portion 26 extending therefrom in a substantially outward direction (as indicated by arrows "A1" and "AZ" in Figure 1). Each respective lateral web portion 26 has an outside portion 26a with a respective lip portion 28 extending therefrom in a substantially downward direction (as indicated by arrow "B" in Figure 1). The roof truss chord of the present invention is preferably formed from galvanized steel sheets or strips.
[0042] At this point, it should perhaps be noted that the various dimensions, orientations and materials specified the drawings are exemplary of dimensions, orientations and materials which fall within acceptable parameters, according to the invention, and it will be appreciated by those skilled in the art that other dimensions, orientations and materials may be used in the design and manufacture of the roof truss chord and apparatus and process for forming same according to the present invention without departing from its spirit and scope. Hereinafter, the roof truss chord 20 may alternately be referred to either as a truss channel profile (as best seen in Figure 1), or simply as a chord.
[0043] As best seen in Figures 14 and 17, two roof truss chords 20 according to the invention, namely, a bottom chord 20a and a top chord 20b, may be used with steel ribs 38 welded therebetween in a criss-cross formation. In this manner, and as best seen in Figure 17, the steel ribs 38 may be assembled together with the roof truss chords 20 so as to form a rigid framework 40 for a roof.
[0044] According to the invention, the roof truss chord 20 is preferably formed by passing a galvanized steel elongate sheet 42 or strip through a series of twelve tooling sets, 51 through 62.
According to a preferred embodiment of the invention, first through last tooling sets, 51 through 62, for forming the chord 20 are shown in Figures 2 through 13.
[0045] The first tooling set 51 is shown in Figure 2 and includes a first roll former assembly 51a and a mating first channel portion 51b. The elongate sheet 42 is first pressed between the first roll former assembly 51a and the mating first channel portion 51b.
[0046] After being partially formed by the first tooling set 51, the elongate sheet 42 is then further formed by a second tooling set 52 (shown in Figure 3). The second tooling set 52 includes a second roll former assembly 52a and a mating second channel portion 52b.
The elongate sheet 42 is further pressed between the second roll former assembly 52a and the mating second channel portion 52b.
[0047] Next, the elongate sheet 42 is still further formed by passing through a third tooling set 53 (shown in Figure 4). The elongate sheet 42 is pressed between a third roll former assembly 53a and a mating third channel portion 53b of the third tooling set 53.
[0048] After being formed as aforesaid by the third tooling set 53, the elongate sheet 42 is passed through a fourth tooling set 54 (shown in Figure 5). The fourth tooling set 54 includes a fourth roll former assembly 54a and a mating fourth channel portion 54b.
The elongate sheet 42 is pressed between the fourth roll former assembly 54a and the mating fourth channel portion 54b.
[0049] Next, the elongate sheet 42 passes through a fifth tooling set 55 (shown in Figure 6), which includes a fifth roll former assembly 55a and a mating fifth channel portion 55b. As with the other tooling sets, the elongate sheet 42 is pressed between the fifth roll former assembly 55a and the mating fifth channel portion 55b.
[0050] The elongate sheet 42 is then moved from the fifth tooling set 55 to a sixth tooling set 56 (shown in Figure 7), which includes a sixth roll former assembly 56a and a mating sixth channel portion 56b. The elongate sheet 42 is then pressed between the sixth roll former assembly 56a and the mating sixth channel portion 56b.
[0051] Thereafter, the elongate sheet 42 passes through a seventh tooling set 57 (shown in Figure 8), which includes a seventh roll former assembly 57a and a mating seventh channel portion 57b. As with the other tooling sets, the elongate sheet 42 is pressed between the seventh roll former assembly 57a and the mating seventh channel portion 57b.
[0052] After passing as aforesaid through the seventh tooling set 57, the elongate sheet 42 is still further formed by an eighth tooling set 58 (shown in Figure 9). The eighth tooling set 58 includes an eighth roll former assembly 58a and a mating eighth channel portion 58b. The elongate sheet 42 is pressed between the eighth roll former assembly 58a and the mating eighth channel portion 58b.
[0053] Next, the elongate sheet 42 passes through a ninth tooling set 59 (shown in Figure 10), which includes a ninth roll former assembly 59a and a mating ninth channel portion 59b. As with the other tooling sets, the elongate sheet 42 is pressed between the ninth roll former assembly 59a and the mating ninth channel portion 59b.
[0054] The elongate sheet 42 is then moved from the ninth tooling set 59 to a tenth tooling set 60 (shown in Figure 11), which includes a tenth roll former assembly 60a and a mating tenth channel portion 60b. The elongate sheet 42 is then pressed between the tenth roll former assembly 60a and the mating tenth channel portion 60b.
[0055] Thereafter, the elongate sheet 42 passes through an eleventh tooling set 61 (shown in Figure 12), which includes an eleventh roll former assembly 61a and a mating eleventh channel portion 61b. As with the other tooling sets, the elongate sheet 42 is pressed between the eleventh roll former assembly 61a and the mating eleventh channel portion 61b.
[0056] Lastly, the elongate sheet 42 is finally passed between the last tooling set 62 (shown in Figure 13), which includes a last roll former assembly 62a and a mating last channel portion 62b.
After being pressed between the last roll former assembly 62a and the mating last channel portion 62b, a cross-sectional profile of the elongate sheet 42 is identical to that of the roof truss chord 20. The process for forming the roof truss chord 20 according to the invention is substantially complete once the entire sheet 42 has passed between last tooling set 62.
[0057] As such, the apparatus and process for forming the roof truss chord 20 according to the present invention will be seen to include the passage of an elongate sheet 42 through a series of tooling sets, each of tooling sets respectively comprised of a roll former assembly and a mating channel portion.
[0058] The process and apparatus for forming the roof truss chord 20, according to the present invention, is capable of forming a high strength elongate roof truss chord of the type shown in the drawings (as best seen in Figures 1, 14 and 17), and provides for the pre-fabrication of roof truss chords 20 and roof trusses using light-weight steel materials. The process and apparatus disclosed hereby provide the tooling necessary for the fabrication of light-weight steel roof truss chords and roof trusses.
[0059] According to the invention, the process and apparatus disclosed hereby are capable of producing roof truss chords 20 that span a distance in the order of approximately seventy-five feet between two bearing walls (not shown). The roof truss chord 20 formed according to the present invention provides significant savings in steel, concrete and labour costs.
[0060] The use of the roof truss chord 20 of the present invention makes roof trusses 40 much stronger. This strength provides the opportunity to create a much longer span between two bearing walls - in the order of approximately seventy-five feet -with significant savings in steel, concrete and labour costs.
[0061] Various other modifications and alterations may be used in the design and manufacture of the roof truss chord 20 and the apparatus and process for forming same, according to the present invention, without departing from the spirit and scope of the invention, which is limited only by the accompanying claims.
Claims (8)
1. A roof truss chord comprising:
a) a substantially "U"-shaped cross-section portion defined by a central base portion, and two opposed outer side portions extending from the central base portion, with each of the outer side portions having a base end portion and a remote end portion;
b) two lateral web portions, each respectively extending in a substantially outward direction from a different one of the opposed side portions adjacent its remote end portion, with each of the lateral web portions having an inward end portion and an outward end portion; and c) two lip portions, each respectively extending substantially perpendicularly from a different one of the lateral web portions adjacent its outward end portion.
a) a substantially "U"-shaped cross-section portion defined by a central base portion, and two opposed outer side portions extending from the central base portion, with each of the outer side portions having a base end portion and a remote end portion;
b) two lateral web portions, each respectively extending in a substantially outward direction from a different one of the opposed side portions adjacent its remote end portion, with each of the lateral web portions having an inward end portion and an outward end portion; and c) two lip portions, each respectively extending substantially perpendicularly from a different one of the lateral web portions adjacent its outward end portion.
2. A roof truss chord comprising a substantially "U"-shaped cross section defined by a lower central base portion and two opposed upper side edge portions, with each of the side edge portions having a top portion with a respective upper lateral web portion extending therefrom in a substantially outward direction, and with each respective upper lateral web portion having an outside portion with a respective lip portion extending therefrom in a substantially downward direction.
3. An apparatus for forming a roof truss chord comprising a series of tooling sets, each adapted for passing an elongate sheet therethrough, with each of the tooling sets respectively comprising a roll form assembly and a mating channel portion.
4. An apparatus for forming a roof truss chord comprising a series of twelve tooling sets, each adapted for passing an elongate sheet therethrough, and with each of the twelve tooling sets respectively comprising a roll form assembly and a mating channel portion.
5. An apparatus according to one of claims 3 and 4, wherein the apparatus is particularly adapted such that passage of the elongate sheet through each successive one of the tooling sets progressively forms the roof truss chord.
6. An apparatus according to claim 5, wherein the apparatus is further adapted such that the roof truss chord has a substantially "U"-shaped cross-section portion defined by a central base portion and two opposed outer side portions extending from the central base portion, with each of the outer side portions having a base end portion and a remote end portion, with roof truss chord further having two lateral web portions, each respectively extending in a substantially outward direction from a different one of the opposed side portions adjacent its remote end portion, with each of the lateral web portions having an inward end portion and an outward end portion, and with the roof truss chord still further having two lip portions, each respectively extending substantially perpendicularly from a different one of the lateral web portions adjacent its outward end portion.
7. A process for forming a roof truss chord comprising the steps of:
a) passing an elongate sheet through a first tooling set comprising a first roll form assembly and a mating first channel portion, wherein the elongate sheet is passed between the first roll form assembly and the first channel portion; and b) passing the elongate sheet through a last tooling set comprising a last roll form assembly and a mating last channel portion, wherein the elongate sheet is passed between the last roll form assembly and the last channel portion, with the last roll form assembly and the last channel portion defining a cross-sectional aperture therebetween, with the cross-sectional aperture having a substantially "U"-shaped cross-section portion defined by a central base portion and two opposed outer side portions extending from the central base portion, with each of the outer side portions having a base end portion and a remote end portion, with the cross-sectional aperture further having two lateral web portions, each respectively extending in a substantially outward direction from a different one of the opposed side portions adjacent its remote end portion, with each of the lateral web portions having an inward end portion and an outward end portion, and with the cross-sectional aperture still further having two lip portions, each respectively extending substantially perpendicularly from a different one of the lateral web portions adjacent its outward end portion; and wherein the roof truss chord is formed upon passage of the elongate sheet through the last tooling set.
a) passing an elongate sheet through a first tooling set comprising a first roll form assembly and a mating first channel portion, wherein the elongate sheet is passed between the first roll form assembly and the first channel portion; and b) passing the elongate sheet through a last tooling set comprising a last roll form assembly and a mating last channel portion, wherein the elongate sheet is passed between the last roll form assembly and the last channel portion, with the last roll form assembly and the last channel portion defining a cross-sectional aperture therebetween, with the cross-sectional aperture having a substantially "U"-shaped cross-section portion defined by a central base portion and two opposed outer side portions extending from the central base portion, with each of the outer side portions having a base end portion and a remote end portion, with the cross-sectional aperture further having two lateral web portions, each respectively extending in a substantially outward direction from a different one of the opposed side portions adjacent its remote end portion, with each of the lateral web portions having an inward end portion and an outward end portion, and with the cross-sectional aperture still further having two lip portions, each respectively extending substantially perpendicularly from a different one of the lateral web portions adjacent its outward end portion; and wherein the roof truss chord is formed upon passage of the elongate sheet through the last tooling set.
8. A process for forming a roof truss chord according to claim 7, further comprising the step of:
a.1) successively passing the elongate sheet through a series of ten intermediate tooling sets, each comprising an intermediate roll form assembly and a mating intermediate first channel portion, wherein the elongate sheet is successively passed between each intermediate roll form assembly and the mating intermediate channel portion.
a.1) successively passing the elongate sheet through a series of ten intermediate tooling sets, each comprising an intermediate roll form assembly and a mating intermediate first channel portion, wherein the elongate sheet is successively passed between each intermediate roll form assembly and the mating intermediate channel portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2467531 CA2467531A1 (en) | 2004-05-18 | 2004-05-18 | Roof truss chord and apparatus and process for forming same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2467531 CA2467531A1 (en) | 2004-05-18 | 2004-05-18 | Roof truss chord and apparatus and process for forming same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2467531A1 true CA2467531A1 (en) | 2005-11-18 |
Family
ID=35452172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2467531 Abandoned CA2467531A1 (en) | 2004-05-18 | 2004-05-18 | Roof truss chord and apparatus and process for forming same |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2467531A1 (en) |
-
2004
- 2004-05-18 CA CA 2467531 patent/CA2467531A1/en not_active Abandoned
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