CA1122769A - Floor joist - Google Patents
Floor joistInfo
- Publication number
- CA1122769A CA1122769A CA327,321A CA327321A CA1122769A CA 1122769 A CA1122769 A CA 1122769A CA 327321 A CA327321 A CA 327321A CA 1122769 A CA1122769 A CA 1122769A
- Authority
- CA
- Canada
- Prior art keywords
- members
- wood
- metal
- truss
- joist
- 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
Abstract
IMPROVED COMBINATION WOOD AND METAL FLOOR JOIST
ABSTRACT
Pairs of small dimensioned lumber members are used for the top and bottom chords of a truss member for a floor joist and the like, A zig-zag series of truss strut members are integrally formed with chord connector plates, from a sheet of metal. The connector plates are located at the apexes of the converging struts and have pointed fastening teeth struck out from either side to project into and be embedded into the inner side faces of the pairs of wood members when the wood members are placed in overlapping parallel relation one with another. The joist is assembled in a factory by placing each pair of wood members in parallel spaced apart with the zig-zag web of struts between them and the connector plates sandwiched within the inner side faces of the pairs of wood members, for simultaneous pressing together in a one-step operation to produce a wood-metal laminated joist structure.
ABSTRACT
Pairs of small dimensioned lumber members are used for the top and bottom chords of a truss member for a floor joist and the like, A zig-zag series of truss strut members are integrally formed with chord connector plates, from a sheet of metal. The connector plates are located at the apexes of the converging struts and have pointed fastening teeth struck out from either side to project into and be embedded into the inner side faces of the pairs of wood members when the wood members are placed in overlapping parallel relation one with another. The joist is assembled in a factory by placing each pair of wood members in parallel spaced apart with the zig-zag web of struts between them and the connector plates sandwiched within the inner side faces of the pairs of wood members, for simultaneous pressing together in a one-step operation to produce a wood-metal laminated joist structure.
Description
~22769 Improved combination wood and metal floor joist Background of the Invention:
The present invention relates to truss members for use in the construction of floor joists and the like and more particularly to truss members made in a factory of both wood and metal components for transport and erection on a building site as a completed joist unit.
In the present invention the chords of the joist are made of wood and the struts of the truss are made of metal. The struts are in the form of a continuous web stamp ed out in a zig-zag configuration from a metal sheet with top and bottom plate portions connectible to the chords by struck-out pointed fastener means projecting into the adjacent inner chord faces.
The prior art means of attaching the struts or webs of metal is to stagger a series of struts along the outer side of a single upper chord and a single lower chord of wood and then to flip over the partially completed truss and fasten another set or series of struts between the other sides of the spaced apart chords.
It is known that th,- quantity of available good lumber for joists and the chords of joist trusses is decreasing rapidly as the size of lumber trees diminishes thereby requiring the spiking together of pieces of lumber to obtain larger pieces or by the use of metal trusses to replace lumber. Pairs of "V" shaped metal struts fastened to adjacent outside planar faces of pairs of parallely spaced wood chord members is the most recent inovation in the art. This improve-ment requires that the metal withstand the stress of the weight to be placed on it because the narrowest side of the wood chord is placed in the vertical plane to reduce the depth of the over-all size of the joist member to acceptable amounts. Another disadvantage of the above discussed impr(vement is that the struts are affixed to the chords in step-by-step operations along one side and then the whole truss is flipped to affix the web of struts to the other side.
~n
The present invention relates to truss members for use in the construction of floor joists and the like and more particularly to truss members made in a factory of both wood and metal components for transport and erection on a building site as a completed joist unit.
In the present invention the chords of the joist are made of wood and the struts of the truss are made of metal. The struts are in the form of a continuous web stamp ed out in a zig-zag configuration from a metal sheet with top and bottom plate portions connectible to the chords by struck-out pointed fastener means projecting into the adjacent inner chord faces.
The prior art means of attaching the struts or webs of metal is to stagger a series of struts along the outer side of a single upper chord and a single lower chord of wood and then to flip over the partially completed truss and fasten another set or series of struts between the other sides of the spaced apart chords.
It is known that th,- quantity of available good lumber for joists and the chords of joist trusses is decreasing rapidly as the size of lumber trees diminishes thereby requiring the spiking together of pieces of lumber to obtain larger pieces or by the use of metal trusses to replace lumber. Pairs of "V" shaped metal struts fastened to adjacent outside planar faces of pairs of parallely spaced wood chord members is the most recent inovation in the art. This improve-ment requires that the metal withstand the stress of the weight to be placed on it because the narrowest side of the wood chord is placed in the vertical plane to reduce the depth of the over-all size of the joist member to acceptable amounts. Another disadvantage of the above discussed impr(vement is that the struts are affixed to the chords in step-by-step operations along one side and then the whole truss is flipped to affix the web of struts to the other side.
~n
-2- ~
~12~g9 SUMMARY OF THE INVENTION
It is the object of the invention to provide a combined wood and metal floor joist that can be fabricated in a one step operation by fastening a single sheet of web steel struts and fastener plates to pairs of upper and lower chords simultaneously.
I have found that the use of a laminated chord of small dimension-ed lumber units spaced apart from a second laminated chord of small dimensioned lumber units by a single metal web of struts having top and bottom fastener plates interfitted between the laminates of wood chords provided a decidedly improved product that is both easier to assemble and used less material than known prefabricated joist trusses.
The principal object of the invention is therefore; to provide a building component such as a floor joist or the like having both wood and metal members comprising in combinationi a pair of elongate wood members of rectangular cross section and having a narrow and a deep dimensioned side, to form when their deep dimensioned sides are placed in parallel interfacing position, a top chord member for a joist; and a second pair of elongate wood members spaced apart from and fastened to the first pair of elongate members by a zig-zag shaped web of metal having fastening plates situate at the apex of the strut joints. Each plate has pointed metal projections struck out from it in rows directed outwardly from each side of it to be hammered into the inner facing sides of each of the pair of adjacently overlying chords.When assembled the web plates are sandwiched between the chords to create the unit-ary wood-metal laminate structure of the invention herein.
~227~9 BRIEF DESCRIPTION OF THE DRAWING
The above objects are shown in the accompaning drawing of a preferred embodiment of the invention wherein;
Figure I is a perspective view of the floor joist herein with one of the bottom chords and one of the top chords partially cut away to show the method of affixing the zig-zag web member to the inner side faces of the chords by means of the struck-o~t projections directed outwardly from each face of the gang plate.
DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE INVENTION
Numeral 10 designates the wood-metal joist of the invention and comprises four wood chord members 12,13,14,15, spaced apart and fastened together by zig-zag metal web member 21. Each chord 12,13,14,15, is rectangular in cross section with the deepest cross-section dimension 28 in the vertical plane of the joist as in use. The narrow dimension 29 becomes one-half of the total width of the joist. The joist shown uses lumber of one and one-eighth inch by three and one-half inch dressed lumber known commonly in the trade and is available in large quantities and of all lengths. The overall depth of the web including top and bottom plates is nine and one half inches with space between chords of five inches thereby providing a joist of 12 inches in depth. The resulting product 10 herein provided is a joist of the same dimensions now used and accepted by house builders throughout the country and thereby easily adapted to and by workmen in the trade.
The lumber used is dressed lumber with the sides planar such that they will mate flush when placed one above or beside the other as shown in the drawing which results in a laminate of parallel members.
The web of metal struts 21 serves to space apart and fasten together the chord members 12,13,14,and 15, and compises struts 30, 31, 32, 33 and continuing along the length of the joist.
l~Z2769 ~ e struts are alternately angled to the horizontal 45 degrees to produce a zig-zag pattern with the top of adjacent struts joined at a gang plate 41 and the adjacent bottom of each strut joined by a bottom gang plate 40. The plate 41, being the end plate, is only joined to strut 30. It will be understood that all the plates and struts will be punched from a single sheet of metal.
The plates 40,41 are fastened to the planar sides 50,51, and 54,55, of the respective top and bottom chords 12,13, and 14,15.Each plate has pointed projections struck from both sides of their face surfaces to pierce the wooden chords at substantially rigth angles to provide a laminate structure of wood-metal-wood with the metal plates hidden from view and not exposed as in the products now available where the exposed connector means results in an unsightly product. Each plate has fastener means 20 struck out from both the back and front surfaces of its sides to project into and hold the chords together when hammered or pressed into the chord side surfaces as shown. The spaces 18 in the drawings is the blank from which the fastener projections have been pressed into chord 12 and the projections 20 are the fastening points that have been pressed or hammered into the cut-away portion of chord 13.
A flange 44 can be provided the ~ge of the plate 40 to assist the positioning of the webs to the chords during fabrication of the joist.
MODE OF CONSTRUCTION
In order to achieve the principal object herein, namely the provis-ion of a pre-fabricated joist or the like using a single metal truss web member and small dimensioned wood chords laminated together in a one step assembly operation, a work table or jig is set up in afactory capable of simultaneously pressing the pairs of upper and lower chords onto the projecting gang of points of the web plates. In assembly different lengths of joists can be made by selecting the desired chords, setting them in parrallel spaced apart posture on the jig, setting the single web of plates and struts over the chords with the plates overlying the chords and then setting the upper and lower (13,15) chords in parallel overlying posture over the web and first chords and then merely simultaneously laminating the whole together under l~Z~769 pressure. Hydraulic pressure means as is well known in the art can be used to assemble and fasten the components together simultaneously.
The pressure gang plate 40 is a novel means of fastening the pair of chords together to make the upper or lower laminate member and it will be appreciated that the pattern of projecting spikes of struck metal can be more irregularly made to give a more irregular piercing characteristic to the plates than is shown without departing from the invention herein. Similarly the size depth and number of upper and lower wood members laminated as described to form a truss chord can be varied without departing from the scope of the invention claimed as novel herein.
~12~g9 SUMMARY OF THE INVENTION
It is the object of the invention to provide a combined wood and metal floor joist that can be fabricated in a one step operation by fastening a single sheet of web steel struts and fastener plates to pairs of upper and lower chords simultaneously.
I have found that the use of a laminated chord of small dimension-ed lumber units spaced apart from a second laminated chord of small dimensioned lumber units by a single metal web of struts having top and bottom fastener plates interfitted between the laminates of wood chords provided a decidedly improved product that is both easier to assemble and used less material than known prefabricated joist trusses.
The principal object of the invention is therefore; to provide a building component such as a floor joist or the like having both wood and metal members comprising in combinationi a pair of elongate wood members of rectangular cross section and having a narrow and a deep dimensioned side, to form when their deep dimensioned sides are placed in parallel interfacing position, a top chord member for a joist; and a second pair of elongate wood members spaced apart from and fastened to the first pair of elongate members by a zig-zag shaped web of metal having fastening plates situate at the apex of the strut joints. Each plate has pointed metal projections struck out from it in rows directed outwardly from each side of it to be hammered into the inner facing sides of each of the pair of adjacently overlying chords.When assembled the web plates are sandwiched between the chords to create the unit-ary wood-metal laminate structure of the invention herein.
~227~9 BRIEF DESCRIPTION OF THE DRAWING
The above objects are shown in the accompaning drawing of a preferred embodiment of the invention wherein;
Figure I is a perspective view of the floor joist herein with one of the bottom chords and one of the top chords partially cut away to show the method of affixing the zig-zag web member to the inner side faces of the chords by means of the struck-o~t projections directed outwardly from each face of the gang plate.
DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE INVENTION
Numeral 10 designates the wood-metal joist of the invention and comprises four wood chord members 12,13,14,15, spaced apart and fastened together by zig-zag metal web member 21. Each chord 12,13,14,15, is rectangular in cross section with the deepest cross-section dimension 28 in the vertical plane of the joist as in use. The narrow dimension 29 becomes one-half of the total width of the joist. The joist shown uses lumber of one and one-eighth inch by three and one-half inch dressed lumber known commonly in the trade and is available in large quantities and of all lengths. The overall depth of the web including top and bottom plates is nine and one half inches with space between chords of five inches thereby providing a joist of 12 inches in depth. The resulting product 10 herein provided is a joist of the same dimensions now used and accepted by house builders throughout the country and thereby easily adapted to and by workmen in the trade.
The lumber used is dressed lumber with the sides planar such that they will mate flush when placed one above or beside the other as shown in the drawing which results in a laminate of parallel members.
The web of metal struts 21 serves to space apart and fasten together the chord members 12,13,14,and 15, and compises struts 30, 31, 32, 33 and continuing along the length of the joist.
l~Z2769 ~ e struts are alternately angled to the horizontal 45 degrees to produce a zig-zag pattern with the top of adjacent struts joined at a gang plate 41 and the adjacent bottom of each strut joined by a bottom gang plate 40. The plate 41, being the end plate, is only joined to strut 30. It will be understood that all the plates and struts will be punched from a single sheet of metal.
The plates 40,41 are fastened to the planar sides 50,51, and 54,55, of the respective top and bottom chords 12,13, and 14,15.Each plate has pointed projections struck from both sides of their face surfaces to pierce the wooden chords at substantially rigth angles to provide a laminate structure of wood-metal-wood with the metal plates hidden from view and not exposed as in the products now available where the exposed connector means results in an unsightly product. Each plate has fastener means 20 struck out from both the back and front surfaces of its sides to project into and hold the chords together when hammered or pressed into the chord side surfaces as shown. The spaces 18 in the drawings is the blank from which the fastener projections have been pressed into chord 12 and the projections 20 are the fastening points that have been pressed or hammered into the cut-away portion of chord 13.
A flange 44 can be provided the ~ge of the plate 40 to assist the positioning of the webs to the chords during fabrication of the joist.
MODE OF CONSTRUCTION
In order to achieve the principal object herein, namely the provis-ion of a pre-fabricated joist or the like using a single metal truss web member and small dimensioned wood chords laminated together in a one step assembly operation, a work table or jig is set up in afactory capable of simultaneously pressing the pairs of upper and lower chords onto the projecting gang of points of the web plates. In assembly different lengths of joists can be made by selecting the desired chords, setting them in parrallel spaced apart posture on the jig, setting the single web of plates and struts over the chords with the plates overlying the chords and then setting the upper and lower (13,15) chords in parallel overlying posture over the web and first chords and then merely simultaneously laminating the whole together under l~Z~769 pressure. Hydraulic pressure means as is well known in the art can be used to assemble and fasten the components together simultaneously.
The pressure gang plate 40 is a novel means of fastening the pair of chords together to make the upper or lower laminate member and it will be appreciated that the pattern of projecting spikes of struck metal can be more irregularly made to give a more irregular piercing characteristic to the plates than is shown without departing from the invention herein. Similarly the size depth and number of upper and lower wood members laminated as described to form a truss chord can be varied without departing from the scope of the invention claimed as novel herein.
Claims
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An improved wood and metal truss member adapted for factory assembly comprising in combination;
a first plurality of elongate wood members having co-planar vertically disposed sides aligned horizontally and parallel with one another to form a laminated top chord of said truss;
and a second plurality of elongate wood members having co-planar vertically disposed sides aligned horizontally and parallel with one another to form a laminated bottom chord of said truss spaced apart from and attached to said first members by a rigid metal web of metal partially interfitted between the laminated top chord members and partially interfitted between the laminated bottom wood chord members and partially exposed between said chords to form said truss therebetween;
said rigid metal web being formed from a single sheet of rigid steel in a zig-zag configuration of alternately angled struts with connector plates situate at the apex of each strut and wherein each connector plate comprises a front and back face and wherein spiked projections are struck out from said front and back of said plate to project normally from each of said faces and are adapted to pierce and hold into a pair of said co-planar elongate wood members and fasten said truss together when pressure is applied to said upper and lower laminate of wood members and metal connector plates.
a first plurality of elongate wood members having co-planar vertically disposed sides aligned horizontally and parallel with one another to form a laminated top chord of said truss;
and a second plurality of elongate wood members having co-planar vertically disposed sides aligned horizontally and parallel with one another to form a laminated bottom chord of said truss spaced apart from and attached to said first members by a rigid metal web of metal partially interfitted between the laminated top chord members and partially interfitted between the laminated bottom wood chord members and partially exposed between said chords to form said truss therebetween;
said rigid metal web being formed from a single sheet of rigid steel in a zig-zag configuration of alternately angled struts with connector plates situate at the apex of each strut and wherein each connector plate comprises a front and back face and wherein spiked projections are struck out from said front and back of said plate to project normally from each of said faces and are adapted to pierce and hold into a pair of said co-planar elongate wood members and fasten said truss together when pressure is applied to said upper and lower laminate of wood members and metal connector plates.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US398979A | 1979-06-16 | 1979-06-16 | |
| US3,989 | 1979-06-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1122769A true CA1122769A (en) | 1982-05-04 |
Family
ID=21708565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA327,321A Expired CA1122769A (en) | 1979-06-16 | 1979-05-10 | Floor joist |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1122769A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6389762B2 (en) | 1997-11-14 | 2002-05-21 | Mitek Holdings, Inc. | Lintel |
-
1979
- 1979-05-10 CA CA327,321A patent/CA1122769A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6389762B2 (en) | 1997-11-14 | 2002-05-21 | Mitek Holdings, Inc. | Lintel |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |