WO1998001636A1 - A structural wooden joist - Google Patents
A structural wooden joist Download PDFInfo
- Publication number
- WO1998001636A1 WO1998001636A1 PCT/CA1997/000478 CA9700478W WO9801636A1 WO 1998001636 A1 WO1998001636 A1 WO 1998001636A1 CA 9700478 W CA9700478 W CA 9700478W WO 9801636 A1 WO9801636 A1 WO 9801636A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- chords
- wooden joist
- structural wooden
- boards
- short
- Prior art date
Links
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
- E04C3/12—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members
- E04C3/16—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members with apertured web, e.g. trusses
Definitions
- the present invention pertains to a structural wooden joist used in building constructions.
- Wooden joist are used increasingly in a number of building applications. They comprise top and bottom elongate chords with intervening struts joined to the chords by means of scarfing.
- One such wooden joist may be found described in Canadian patent application
- the present invention therefore relates to a structural wooden joist which comprises: a) an elongated lower chord; b) an elongated upper chord in a spaced apart generally parallel opposed relation to the lower chord; c) an openwork web structure joining the chords; the web structure including, between opposite ends thereof, a series of horizontally spaced trapezoidal laminated panels defining a series of triangular spacings therebetween; each panel having opposite short and long sides adhesively joined to the lower and upper chords respectively; each panel being formed of short obliquely extending boards adhesively secured edgewise to one another.
- the short and long sides of the panel are secured to the chords by scarfing.
- the boards are made of kiln dry wood and selected from the group that includes fir, spruce and pine.
- Figure 1 is an elevational view of a wooden joist made in accordance with the present invention
- Figure 2 is a cross-sectional view taken along lines 2-2 of
- Figure 3 is an elevational view of one trapezoidal panel used in the joist of figure 1 ;
- Figure 4 is a side view thereof
- Figure 5 is an elevational view of an end panel of the joist of figure 1 ;
- Figure 6 is an enlarged elevational view of two chords sections connected together.
- FIG. 1 there is shown a structural wooden joist, generally denoted 10, which comprises an elongated lower chord 12 and an upper chord 14 in spaced apart generally parallel opposed relation to the lower chord 12. Between the upper and lower chords is provided an open work web structure consisting of a series of panels horizontally displayed between two opposite end panels 18 and 20.
- each panel 16 consists of a series of short obliquely extending boards 21 , 22, 24, 26, 28 and 30 which are adhesively secured in an edgewise fashion to one another.
- the boards may also be formed of boards which are joined in an endwise manner by glue or scarfing.
- the trapezoidal panel 16 has two opposite inclined edges 16a and 16b, a short side 16c and a long side 16d. As can be seen in figure 4, the short side 16c and long side 16d have a finger scarfing configuration. Other connections can be used, such as those illustrated in U.S. patent No.
- the two opposite end panels 18 and 20 have an identical configuration which is a four-sided structure that includes, in the case of panel 18, an oblique side 18a and an opposite side 18b which is perpendicular to a short side 18c and long upper side 18d.
- this panel is formed of a series of obliquely extending boards 32, 34, 36, 38, 40 and 42 which are also adhesively secured to one another in an edgewise fashion.
- the opposite sides 18c and 18d also have a finger scarfing configuration similar to that of sides 16c and 16d of the panels 16. All the boards used in the laminated panels 16, 18 and 20 are preferably disposed at an angle of 30°; other angles however may be used in accordance with configuration and/or height of the joist.
- the elongated chords may consist of a series of chord sections (two being shown as 12a and 12b) which are again interconnected by means of finger scarfing and glued to one another in an endwise manner.
- the chords are pre-cambered.
- the wood used for all the boards of the panels is preferably kiln dry wood, selected from the group consisting of fir, spruce and pine.
- the adhesive used in securing the boards together as well as that used in the finger scarfing sections is a glue preferably having a base of resin resorcinol, such as phenol-resorcinol resin.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU32522/97A AU3252297A (en) | 1996-07-08 | 1997-07-02 | A structural wooden joist |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA 2180715 CA2180715C (en) | 1996-07-08 | 1996-07-08 | Structural wooden joist |
CA2,180,715 | 1996-07-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998001636A1 true WO1998001636A1 (en) | 1998-01-15 |
Family
ID=4158563
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CA1997/000478 WO1998001636A1 (en) | 1996-07-08 | 1997-07-02 | A structural wooden joist |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU3252297A (en) |
CA (1) | CA2180715C (en) |
WO (1) | WO1998001636A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006056651A1 (en) * | 2004-11-29 | 2006-06-01 | Patenttitoimisto T Poutanen Oy | Joint between wood pieces |
DE102009005102A1 (en) * | 2009-01-19 | 2010-07-22 | Binderholz Gmbh Holzindustrie | Component and method for producing a component |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR419822A (en) * | 1910-08-29 | 1911-01-16 | Otto Hetzer | Beams and other similar pieces of wood, arranged in compartments |
US2444133A (en) * | 1943-05-11 | 1948-06-29 | Mid West Wood Products Company | Building unit of generally right triangular form |
FR984792A (en) * | 1949-04-15 | 1951-07-10 | Wooden beam composed of several boards glued together | |
DE903373C (en) * | 1951-12-08 | 1954-02-04 | Eerich A Falk | Wooden beams or binders |
FR1305199A (en) * | 1961-11-13 | 1962-09-28 | Truss beam | |
GB1367893A (en) * | 1971-12-16 | 1974-09-25 | Holme Sons Ltd Walter | Structural beams |
FR2246388A1 (en) * | 1973-10-08 | 1975-05-02 | Ion Corp | Wooden construction frame component - comprises two planks with edges cut out and protrusions fitting together |
US4228631A (en) * | 1978-09-12 | 1980-10-21 | Geffe Bruce T | Hollow rectangular joist |
US4356045A (en) * | 1980-05-30 | 1982-10-26 | St. Regis Paper Company | Complete production line of wood I-joist manufacturing apparatus the method of manufacture, and the I-joist product, having lumber chords and a plywood web |
CA2008043A1 (en) * | 1990-01-18 | 1991-07-18 | Rene Paul Lemyre | Open joist |
FR2669066A1 (en) * | 1990-11-13 | 1992-05-15 | Antignac Paul | Device for stressing glued laminated wood beams - has two curved half-beams on adjustable platform to cater for two or more supports using chamber |
-
1996
- 1996-07-08 CA CA 2180715 patent/CA2180715C/en not_active Expired - Fee Related
-
1997
- 1997-07-02 AU AU32522/97A patent/AU3252297A/en not_active Abandoned
- 1997-07-02 WO PCT/CA1997/000478 patent/WO1998001636A1/en active Application Filing
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR419822A (en) * | 1910-08-29 | 1911-01-16 | Otto Hetzer | Beams and other similar pieces of wood, arranged in compartments |
US2444133A (en) * | 1943-05-11 | 1948-06-29 | Mid West Wood Products Company | Building unit of generally right triangular form |
FR984792A (en) * | 1949-04-15 | 1951-07-10 | Wooden beam composed of several boards glued together | |
DE903373C (en) * | 1951-12-08 | 1954-02-04 | Eerich A Falk | Wooden beams or binders |
FR1305199A (en) * | 1961-11-13 | 1962-09-28 | Truss beam | |
GB1367893A (en) * | 1971-12-16 | 1974-09-25 | Holme Sons Ltd Walter | Structural beams |
FR2246388A1 (en) * | 1973-10-08 | 1975-05-02 | Ion Corp | Wooden construction frame component - comprises two planks with edges cut out and protrusions fitting together |
US4228631A (en) * | 1978-09-12 | 1980-10-21 | Geffe Bruce T | Hollow rectangular joist |
US4356045A (en) * | 1980-05-30 | 1982-10-26 | St. Regis Paper Company | Complete production line of wood I-joist manufacturing apparatus the method of manufacture, and the I-joist product, having lumber chords and a plywood web |
CA2008043A1 (en) * | 1990-01-18 | 1991-07-18 | Rene Paul Lemyre | Open joist |
FR2669066A1 (en) * | 1990-11-13 | 1992-05-15 | Antignac Paul | Device for stressing glued laminated wood beams - has two curved half-beams on adjustable platform to cater for two or more supports using chamber |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006056651A1 (en) * | 2004-11-29 | 2006-06-01 | Patenttitoimisto T Poutanen Oy | Joint between wood pieces |
US7975736B2 (en) | 2004-11-29 | 2011-07-12 | Tuomo Poutanen | Joint between wood pieces |
DE102009005102A1 (en) * | 2009-01-19 | 2010-07-22 | Binderholz Gmbh Holzindustrie | Component and method for producing a component |
Also Published As
Publication number | Publication date |
---|---|
CA2180715A1 (en) | 1998-01-09 |
AU3252297A (en) | 1998-02-02 |
CA2180715C (en) | 1999-10-05 |
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