EP1473420B1 - Joists - Google Patents

Joists Download PDF

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Publication number
EP1473420B1
EP1473420B1 EP04252159A EP04252159A EP1473420B1 EP 1473420 B1 EP1473420 B1 EP 1473420B1 EP 04252159 A EP04252159 A EP 04252159A EP 04252159 A EP04252159 A EP 04252159A EP 1473420 B1 EP1473420 B1 EP 1473420B1
Authority
EP
European Patent Office
Prior art keywords
joist
joists
chords
block
length
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 - Lifetime
Application number
EP04252159A
Other languages
German (de)
French (fr)
Other versions
EP1473420A1 (en
Inventor
Paul Baron
Alan Peter Shuttle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aldershot GNS Ltd
Original Assignee
Gang Nail Systems Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Gang Nail Systems Ltd filed Critical Gang Nail Systems Ltd
Publication of EP1473420A1 publication Critical patent/EP1473420A1/en
Application granted granted Critical
Publication of EP1473420B1 publication Critical patent/EP1473420B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
    • E04C3/291—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures with apertured web
    • 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
    • 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
    • E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
    • E04C3/292—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures the materials being wood and metal

Definitions

  • This invention relates to joists, a term intended to cover similar structural components such as beams, struts or ties.
  • Some known joists are fabricated in a factory to required lengths and delivered to the job site. On arrival at the job site, the joist is sometimes found to be under or over length: extending the length of a joist is virtually impossible and shortening the length of a joist by cutting is difficult because typical joists have metal webs.
  • joists with trimmable ends of wood have been made available but these have not satisfied the dual requirements of being capable of being trimmed to a desired length and also readily supported at their ends in a wall or by a joist hanger.
  • Document US-A-4501102 discloses (see figures 1 and 3 ) a joist (10), with upper and lower chords (11, 12) interconnected by web means (14), wherein the identical ends of the joist have a block of wood or wood substitute (35, 36) of a width corresponding to the width of the chords, whreby each end of the joist is of solid material which can be cut through at any position on the joist end to enable the joist to be trimmed to a desired length on site.
  • each joist comprising longitudinally extending upper and lower chords interconnected by web means, wherein each end of each joist has a block of wood (or wood substitute) which spans and interconnects the upper and lower chords and which has a width corresponding to the width of the chords, whereby said each end of the joist is of solid material which can be cut through at any position on the joist end to enable the joist to be trimmed to a desired length on site, and wherein the plurality of joists comprises at least two joists of differing lengths, and each joist having trimmable ends of the same length, the difference in length between the joists being less than the combined length of the trimmable ends of either joist.
  • the or each block may be connected to the chords by any convenient means, but a mechanical connection employing nails or tangs is preferred.
  • each joist Preferably the two ends of each joist are identical, each having a corresponding block of wood (or wood substitute) and each being capable of being cut to enable the joist to be trimmed to size.
  • the or each block is preferably softwood but may be a substitute made from other materials, e.g. reconstituted plastic.
  • the web means may be of metal, conveniently being v-shaped metal webs attached to both facing sides of the chords.
  • the invention can be extended to any plural number of joists, for example six in the specific embodiment to be described.
  • the series of six modular joists shown in Figures 1A to 1F have respective overall lengths of 4,800mm, 4,200mm, 3,600mm, 3,000mm, 2,400mm and 1,800mm. At each end of each joist there is an end portion 10 having a length of 350mm.
  • the joists have respective central portions 12 with lengths of 4,100mm, 3,500mm, 2,900mm, 2,300mm, 1,700mm and 1,100mm. Apart from the lengths of the central portions 12, the six joists are identical so the shorter joist shown in Figure 1 will now be described in detail.
  • the shorter joist has wooden upper and lower chords 14, 16 each of which is of the same rectangular cross-sectional shape and extends for the complete length of the joist. Over the central portion 12 of the joist, the chords are interconnected by V-shaped metal webs 18 which are nail plated to the outwardly-facing edges of the chords 14, 16, so the central portion 12 is hollow and can accommodate services such as wiring or plumbing.
  • the volume between the chords 14, 16 is filled by a solid wooden block 20 the upper surface of which is rigidly attached to the undersurface of the chord 14 and the lower surface of which is rigidly attached to the upper surface of the chord 16.
  • the block 20 has a width identical to the width of the chords 14, 16 so that in cross-section the end portion 10 presents a rectangular shape.
  • Figures 3 and 4 show how a 50mm length at the end of each block 20 adjoining the central portion 12 is chamfered at 22 to receive the ends of the adjacent metal webs 18.
  • each end portion 10 is of solid wooden material (made up of the upper and lower chords 14, 16 and the wooden block 20) the end portion 10 can be sawn transversely to the length of the joist to enable the joist to be trimmed to length on the job site.
  • a joist of any length can be obtained by appropriate trimming of a joist end.
  • the joist end presents a rectangular cross-sectional shape which is devoid of recesses.
  • This rectangular cross-sectional shape makes it easier for the joist end to be secured to a joist hanger (which can be attached directly to the planar sides of the joist end) or for the joist end to be built into a wall.
  • the dimensions of the joists, chords and block may vary but four exemplary sets of dimensions are given in millimetres in the four lines of the table below.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Floor Finish (AREA)
  • Tea And Coffee (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

This invention is concerned with a joist comprising longitudinally extending upper and lower chords (14, 16) interconnected by web means (18), wherein at least one end (10) of the joist has a block (20) of wood (or wood substitute) which spans and interconnects the upper and lower chords (14, 16) and which has a width corresponding to the width of the chords (14, 16), whereby said one end (10) of the joist is of solid material which can be cut through at any position on the joist end (10) to enable the joist to be trimmed to a desired length on site. The equality of width of the block (20) and the chords (14, 16) also gives a trimmed joist a rectangular cross-section which facilitates building-in of the joist end (10) or support of the joist end (10) by a joist hanger.

Description

    Field of the Invention
  • This invention relates to joists, a term intended to cover similar structural components such as beams, struts or ties.
    • Background to the Invention
  • Some known joists are fabricated in a factory to required lengths and delivered to the job site. On arrival at the job site, the joist is sometimes found to be under or over length: extending the length of a joist is virtually impossible and shortening the length of a joist by cutting is difficult because typical joists have metal webs. To overcome this problem joists with trimmable ends of wood have been made available but these have not satisfied the dual requirements of being capable of being trimmed to a desired length and also readily supported at their ends in a wall or by a joist hanger.
  • Document US-A-4501102 discloses (see figures 1 and 3) a joist (10), with upper and lower chords (11, 12) interconnected by web means (14), wherein the identical ends of the joist have a block of wood or wood substitute (35, 36) of a width corresponding to the width of the chords, whreby each end of the joist is of solid material which can be cut through at any position on the joist end to enable the joist to be trimmed to a desired length on site.
    • Summary of the Invention
  • According to the invention there is provided a plurality of joists, each joist comprising longitudinally extending upper and lower chords interconnected by web means, wherein each end of each joist has a block of wood (or wood substitute) which spans and interconnects the upper and lower chords and which has a width corresponding to the width of the chords, whereby said each end of the joist is of solid material which can be cut through at any position on the joist end to enable the joist to be trimmed to a desired length on site, and wherein the plurality of joists comprises at least two joists of differing lengths, and each joist having trimmable ends of the same length, the difference in length between the joists being less than the combined length of the trimmable ends of either joist.
  • The or each block may be connected to the chords by any convenient means, but a mechanical connection employing nails or tangs is preferred.
  • Not only can the solid material at the joist end be cut to provide a joist of a length required at the job site, but the equality of width of the block and the chords gives a trimmed joist a rectangular cross-section which facilitates building-in of the joist end or support of the joist end by a joist hanger.
  • Preferably the two ends of each joist are identical, each having a corresponding block of wood (or wood substitute) and each being capable of being cut to enable the joist to be trimmed to size.
  • The or each block is preferably softwood but may be a substitute made from other materials, e.g. reconstituted plastic.
  • The web means may be of metal, conveniently being v-shaped metal webs attached to both facing sides of the chords.
  • The invention can be extended to any plural number of joists, for example six in the specific embodiment to be described.
    • Brief Description of the Drawings
  • A series of six joists, in accordance with the invention will now be described by way of example with reference to the accompanying drawings in which:
    • Figures 1a to 1f are side views of the six joists,
    • Figure 2 is an end view on the line A-A of Figure 1F,
    • Figure 3 is a side view of a block of an end portion of one of the joists, and
    • Figure 4 is an end view of the block shown in Figure 3.
    Detailed Description
  • The series of six modular joists shown in Figures 1A to 1F have respective overall lengths of 4,800mm, 4,200mm, 3,600mm, 3,000mm, 2,400mm and 1,800mm. At each end of each joist there is an end portion 10 having a length of 350mm. Thus, the joists have respective central portions 12 with lengths of 4,100mm, 3,500mm, 2,900mm, 2,300mm, 1,700mm and 1,100mm. Apart from the lengths of the central portions 12, the six joists are identical so the shorter joist shown in Figure 1 will now be described in detail.
  • The shorter joist has wooden upper and lower chords 14, 16 each of which is of the same rectangular cross-sectional shape and extends for the complete length of the joist. Over the central portion 12 of the joist, the chords are interconnected by V-shaped metal webs 18 which are nail plated to the outwardly-facing edges of the chords 14, 16, so the central portion 12 is hollow and can accommodate services such as wiring or plumbing.
  • At each end portion 10, the volume between the chords 14, 16 is filled by a solid wooden block 20 the upper surface of which is rigidly attached to the undersurface of the chord 14 and the lower surface of which is rigidly attached to the upper surface of the chord 16. As best seen in Figure 2, the block 20 has a width identical to the width of the chords 14, 16 so that in cross-section the end portion 10 presents a rectangular shape.
  • Figures 3 and 4 show how a 50mm length at the end of each block 20 adjoining the central portion 12 is chamfered at 22 to receive the ends of the adjacent metal webs 18. In Because each end portion 10 is of solid wooden material (made up of the upper and lower chords 14, 16 and the wooden block 20) the end portion 10 can be sawn transversely to the length of the joist to enable the joist to be trimmed to length on the job site. By providing a series of joists with a step difference in length (600mm) of less than twice the length of each end portion 10 (350mm), a joist of any length can be obtained by appropriate trimming of a joist end.
  • Whether trimmed or not, the joist end presents a rectangular cross-sectional shape which is devoid of recesses. This rectangular cross-sectional shape makes it easier for the joist end to be secured to a joist hanger (which can be attached directly to the planar sides of the joist end) or for the joist end to be built into a wall.
  • The dimensions of the joists, chords and block may vary but four exemplary sets of dimensions are given in millimetres in the four lines of the table below.
    Overall vertical depth of joist Horizontal width of joist Vertical depth of each chord Vertical depth of block
    195 72 or 97 35 125
    219 72 or 97 47 125
    254 72 or 97 47 160
    304 72 or 97 47 210

Claims (7)

  1. A plurality of joists, each joist comprising longitudinally extending upper and lower chords (14, 16) interconnected by web means (18), wherein each end of each joist has a block of wood or wood substitute (20) which spans and interconnects the upper and lower chords (14, 16) and which has a width corresponding to the width of the chords (14, 16), whereby said each end of the joist is of solid material which can be cut through at any position on the joist end to enable the joist to be trimmed to a desired length on site, and wherein the plurality of joists comprises at least two joists of differing lengths, and each joist having trimmable ends of the same length, the difference in length between the joists being less than the combined length of the trimmable ends of either joist.
  2. A plurality of joists according to claim 1, wherein the or each block (20) is softwood.
  3. A plurality of joists according to claim 1, wherein the or each block (20) is a wood substitute made from reconstituted plastic.
  4. A plurality of joists according to any one of claims 1 to 3, wherein the two ends of each joist are identical, each having a corresponding block (20) of wood or wood substitute and each being capable of being cut to enable the joist to be trimmed to size.
  5. A plurality of joists according to any one of the preceding claims, wherein each block (20) is connected to the chords (14, 16) by a mechanical connection employing nails or tangs.
  6. A plurality of joists according to any one of the preceding claims, wherein the web means (18) are v-shaped metal webs attached to both facing sides of the chords.
  7. A plurality of joists according to any of the preceding claims, wherein there are six joists.
EP04252159A 2003-05-01 2004-04-13 Joists Expired - Lifetime EP1473420B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0310032 2003-05-01
GB0310032A GB2401123B (en) 2003-05-01 2003-05-01 Joists

Publications (2)

Publication Number Publication Date
EP1473420A1 EP1473420A1 (en) 2004-11-03
EP1473420B1 true EP1473420B1 (en) 2009-03-11

Family

ID=9957368

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04252159A Expired - Lifetime EP1473420B1 (en) 2003-05-01 2004-04-13 Joists

Country Status (4)

Country Link
EP (1) EP1473420B1 (en)
AT (1) ATE425316T1 (en)
DE (1) DE602004019837D1 (en)
GB (1) GB2401123B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE548219T1 (en) * 2007-01-29 2012-03-15 Rolfo Spa INTERVENTION DEVICE FOR REGULATING THE OPERATING POSITION OF MANUAL PLATES FOR LOADING/UNLOADING VEHICLES

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB628032A (en) * 1946-01-31 1949-08-19 Alexander Anderson Improvements in and relating to structural members for the construction of houses orother structures
US4207719A (en) * 1978-04-03 1980-06-17 James Knowles Composite construction beam
US4501102A (en) * 1980-01-18 1985-02-26 James Knowles Composite wood beam and method of making same
CA2008043C (en) * 1990-01-18 1999-12-28 Rene Paul Lemyre Open joist
WO1996005385A1 (en) * 1994-08-12 1996-02-22 Techtruss Holdings Pty. Ltd. Structural beam and web
US5592800A (en) * 1995-01-20 1997-01-14 Truswal Systems Corporation Truss with adjustable ends and metal web connectors
US20020148193A1 (en) * 2001-02-13 2002-10-17 Romaro 2000 Limitee Structural wooden joist

Also Published As

Publication number Publication date
DE602004019837D1 (en) 2009-04-23
GB0310032D0 (en) 2003-06-04
ATE425316T1 (en) 2009-03-15
GB2401123A (en) 2004-11-03
GB2401123B (en) 2005-11-16
EP1473420A1 (en) 2004-11-03

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