# US 2021/0340766 A1 ยท Glued timber trussed joist, joint and method > Agents: this data is available as JSON from the patentgrep API and MCP server โ€” see https://patentgrep.com/llms.txt - Number: US 2021/0340766 A1 - Document ID: US20210340766A1 - Status: Published application - Kind: A1 - Application number: 16/865,763 - Filed: 2020-05-04 - Published: 2021-11-04 - Earliest claimed: 2020-05-04 - Assignees: Patenttitoimisto T. Poutanen Oy - Applicants: Patenttitoimisto T. Poutanen Oy - Inventors: Tuomo Poutanen - Web page: https://patentgrep.com/patent/US20210340766A1 ## CPC - E04C 3/16: with apertured web, e.g. trusses (E04C3/17, E04C3/18 take precedence) - E04C: STRUCTURAL ELEMENTS; BUILDING MATERIALS (for bridges E01D; specially designed for insulation or other protection E04B; elements used as building aids E04G; for mining E21; for tunnels E21D; structural elements with broader range of application than for building engineering F16, particularly F16S) ## Abstract A glued trussed joist, joint and method are provided which include two chords, the lower chord and the upper chord located a distance from each other and two elongated webs are located between the chords. The upper ends of the webs are connected in the upper chord and the lower ends of the webs connected in the lower chord. The lower ends of the webs have at least one tenon finger and the lower chord has a matching mortise routing. The tenon fingers are inserted using glue to make a joint to resist forces and moments in the joist and the chord routing goes through the chord. ## Claims ### Claim 1 A joint in a glued trussed joist comprising: a first chord that has an inner face and an opposite outer face; a second chord that has an inner face that faces the inner face of the first chord and an opposite outer face that faces away from the first chord, the first and second chords being spaced apart; a first elongated web having an upper end and an opposite lower end; and a second elongated web having an upper end and an opposite lower end; wherein the upper end of the first elongated web and the upper end of the second elongated web are connected to the first chord and the lower end of the first elongated web and the lower end of the second elongated web are connected to the second chord such that the first and second elongated webs define a crosswise opening; wherein the lower end of each of the first elongated web and the second elongated web has at least one straight or tapering tenon finger; wherein the second chord has a mortise routing formed therein that is complementary to and receives the tenon fingers of the first and second elongated webs to create the joint in the second chord using glue, the first elongated web being in tension and being fixed in the mortise routing with a fingertip of the first elongated web, that is formed at the lower end of the first elongated web, being visible at the outer face of the second chord. ### Claim 2 (depends on 1) The joint of claim 1, wherein the crosswise opening has one of about a triangular shape and a trapezoidal shape. ### Claim 3 (depends on 1) The joint of claim 1, wherein the mortise routing of the second chord extends completely through the second chord and is thus open along both the inner face and the outer face. ### Claim 4 (depends on 1) The joint of claim 1, wherein the inner edge of the at least one straight or tapering tenon finger that defines the lower end of one of the first elongated web and the second elongated web in tension lies within about โˆ’3 mm to +3 mm of a plane that contains the outer face of the second chord. ### Claim 5 (depends on 1) The joint of claim 1, wherein a first edge of the first elongated web with tension contacts a first end wall of the mortise routing at first and second points so as to define a first closed space between the first elongated web and the first end wall, wherein the first edge of the first elongated web contacts the first end wall of the mortise routing at the inner face of the first chord at the first point and contacts the first end wall of the mortise routing at the outer face of the first chord at the second point. ### Claim 6 (depends on 1) The joint of claim 1, wherein a shape of a first edge of the first elongated web matches a first end wall of the mortise routing such that the first edge of the first elongated web seats against the first end wall. ### Claim 7 (depends on 1) The joint according to claim 1, wherein each of the first elongated web and the second elongated web has one straight end cut in the lower end thereof which makes an angle of <90 degrees, regarding a direction of the second chord creating a peak and the first and second elongated webs overlap in the peak portions thereof with about one half of the peak portion being absent in each of the first elongated web and the second edges of the webs cross at the inner face of the chord. ### Claim 8 (depends on 1) The joint according to claim 1, wherein each of the first elongated web and the second elongated web has only one tenon finger at the lower end thereof. ### Claim 9 (depends on 8) The joint according to claim 8, wherein each tenon finger of each of the first elongated web and the second elongated web has a match with the mortise routing such that any gap between the tenon finger and the mortise routing and between the first and second elongated webs is less than about 0.5-1 mm. ### Claim 10 (depends on 1) The joint according to claim 1, wherein one of the first elongated web and the second elongated web is in tension and the other of the first elongated web and the second elongated web is in compression, wherein the elongated web in tension has a glue area that is greater in area than a glue area of the elongated web in compression and both the elongated web in tension and the elongated web in compression have the same thickness. ### Claim 11 (depends on 1) The joint according to claim 1, wherein one of the first elongated web and the second elongated web is in tension and the other of the first elongated web and the second elongated web is in compression, wherein the elongated web in tension has a glue area that is greater in area than a glue area of the elongated web in compression and the elongated web in compression has a greater thickness compared to a thickness of the elongated web in tension. ### Claim 12 A joint in a glued trussed joist comprising: a first chord that has an inner face and an opposite outer face; a second chord that has an inner face that faces the inner face of the first chord and an opposite outer face, the first and second chords being spaced apart; a first elongated web having an upper end and an opposite lower end; and a second elongated web having an upper end and an opposite lower end; wherein the upper end of the first elongated web and the upper end of the second elongated web are connected to the first chord and the lower end of the first elongated web and the lower end of the second elongated web are connected to the second chord such that the first and second elongated webs define a crosswise opening having one of about a triangular shape and a trapezoidal shape; wherein the lower end of each of the first elongated web and the second elongated web has at least one straight or tapering tenon finger; wherein the second chord has a mortise routing formed therein that is complementary to and receives the tenon fingers of the first and second elongated webs to create the joint in the second chord using glue, the mortise routing of the second chord extending through the second chord so as to be open along both the inner face and the outer face and being defined by first and second routing ends, an open gap is formed between at least one of the first and second routing ends of the mortise routing and the at least one straight or tapering tenon finger of one of the first elongated web and the second elongated web, thereby defining a continuous fluid pathway within the mortise routing from the opening of the mortise routing at the inner face to the opening of the mortise routing at the outer face. ### Claim 13 (depends on 12) The joint of claim 12, wherein the first elongated web is free of contact and spaced from the first routing end and the second elongated web is free of contact and spaced from the second routing end. ### Claim 14 (depends on 12) The joint of claim 12, wherein only one of the first elongated web and the second elongated web is spaced from a respective routing end of the mortise routing. ### Claim 15 (depends on 13) The joint of claim 13, wherein a gap is further formed between the first elongated web and the second elongated web. ### Claim 16 (depends on 12) The joint of claim 12, wherein the first elongated web is in contact with the first routing end and the second elongated web is in contact with the second routing end and the only gap is between the first and second elongated webs. ### Claim 17 (depends on 12) The joint of claim 12, wherein an outer edge of the at least one straight or tapering tenon finger that defines the lower end of one of the first elongated web and the second elongated web lies within about โˆ’3 mm to +3 mm of a plane that contains the outer face of the second chord. ### Claim 18 A method for performing quality assurance of an integrity of a joint of a trussed joist that includes a chord with an inner face and opposite outer face and at least one straight or tapering mortise finger in the chord and at least two webs, with tenon fingers matching with a mortise routing formed through the chord, wherein the at least two webs are inserted from an inner side of the chord in the mortise routing and glue is used to make the joint resistive to stresses in the joist, the method comprising the step of: visually checking for an existence of the glue in the tenon fingers by inspecting tips or the sides of the tenon fingers from an outer face of the mortise routing that is open along the outer face of the chord or from one or more gaps that are defined between one web and one respective routing end. ### Claim 19 (depends on 18) The method according to claim 18, wherein a round test sample diameter less than about one half chord depth is bored horizontally or diagonally through at least one web-chord glue area and the validity of the joint is resolved by inspecting the test sample.