The present invention relates to a connection between a first, supporting structural member, such as a post or header, and a second, supported structural member such as a beam or joist. The connection is typically made with a connector and fasteners, the use of which can be substantially hidden from view. The connector is inserted into one or more openings formed in the second, structural member and attaches to a surface of the first, supporting structural member. The connector is formed with a central flange, typically called a knife plate, that is inserted into the supported structural member.
German Utility Model No. 90 01 067 teaches a concealed joining element with a central flange that is inserted in the supported member that is made from a sheet of relatively thin material whose effective thickness is increased by providing deformations or beads in the sheet metal so that the knife plate of the connector will fit more snugly in the slotted opening of the supported structural member and thus prevent looseness in the connection.
German Utility Model No. 92 05 490 also teaches a concealed joining element made from a sheet of relatively thin material, but instead of providing the attachment web with deformations and beads to increase its effective thickness, the invention crimps or folds the material of the openings over themselves to increase the effective thickness of the knife plate of the connector.
German Patent No. DE 41 24 553, published in March of 1992, teaches a two-part, concealed joining element. Two similarly-shaped, L-shaped members are joined together so that their larger flanges overlap to form a knife plate that is inserted into the slotted opening of the supported structural member. The smaller flanges of the L-shaped members make up the fastening flanges that attached to the supporting structural member. The flanges that make up the knife plate are provided with deformations or embossed portions to increase the effective thickness of the combined knife plate.
U.S. Pat. No. 5,062,733, granted in 1991, teaches a concealed joining element with slots formed in the upper portion of the knife plate for receiving dowels that connect the knife plate of the joining element to the second structural member.
U.S. Pat. No. 5,598,680, granted in 1997, teaches a concealed joining element with a knife plate and fastening flanges that are bent from the knife plate to attach the joining element to the supporting structural member. An upper fastening flange extends above the top of the knife plate and a lower fastening flange extends below the bottom of the knife plate. Each fastening flange extends to both opposed sides of the knife plate.
U.S. Pat. No. 5,061,111, granted in 1991, teaches a concealed joining element with a knife plate and a fastening flange attached to the end of the knife plate. A seat plate is also attached to the knife plate and the supported member bears upon the seat plate.
U.S. Pat. No. 4,398,841, granted in 1983, teaches a concealed joining element with a knife plate and a seat plate attached to the lower bracketing edge of the knife plate. The knife plate of U.S. Pat. No. 4,398,841 is formed with hooked members at the rear edge of the knife plate that fit into slots in a block member that is part of a post.
The present invention provides a concealed joining element with a knife plate inserted into the supported structural member and a seat plate upon which the supported member rests that is economical to produce, amenable to present construction methods and achieves high load values.
The present invention provides a connection between a supporting structural member and a supported structural member made with a connector and one or more first fastenings and one or more second fastenings. The connector is constructed in such a manner that the connector has a knife plate that is inserted into a slotted or narrow opening in the second structural member and a seat plate upon which the supported structural member bears. The connector and fasteners can be substantially hidden from view.
The connector has a substantially planar knife plate. In the preferred embodiment, the substantially planar knife plate is inserted into a slotted opening in the second, supported structural member. Generally, the slot is provided at the end of the second, supported structural member. The connector is attached to the first structural member through one or more fastening flanges. The one or more fastening flanges preferably receive fasteners that are driven through the fastening flanges and into the first structural member. Some of the fastener enter into the first structural member orthogonally to the one or more fastening flanges, and some of the fastening flanges enter the first structural member at acute angles to the one or more fastening flanges. Preferably the fasteners are driven through the one or more fastening flanges in an upward direction at an acute angle to the one or more fastening flanges. Preferably the orthogonally oriented fasteners are arranged along the height of the connector so as to be interspersed with the acutely angled fasteners.
Preferably the fasteners that attach the one or more fastening flanges to the first structural member are self-drilling screws when the first structural member is made from wood or a similar material.
The one or more fastening flanges of the connector are formed with slotted openings to guide the fasteners driven at an acute angle to the one or more fastening flanges. The one or more slotted openings are also set at an acute angle to the substantially planar knife plate with the upper portions of the slotted openings directed inwardly to the knife plate with respect to the lower portions of the slotted openings such that the pin-type fasteners are inserted upwardly into the first structural member and directed towards a plane that would be an extension of the knife plate into the first structural member, depending on which side of the knife plate the slotted opening is located.
The present invention provides a connection 1 between a supporting, first structural member 2 and a supported, second structural member 3 made with a connector 4 and one or more first fasteners 5 and one or more second fasteners 6. Note that in some embodiments, the first structural member 2 could be the supported member and the second structural member 3 could be the supporting member. The connection 1 and the connector 4 are constructed in such a manner that the connector 4 and fasteners 5 and 6 can be substantially hidden from view. The first structural member 2 is preferably a post or a header with a generally planar attachment surface 7. The second structural member 3 is preferably an elongated joist or a beam abutting or substantially abutting the first structural member 2 at the attachment surface 7. The elongated second structural member 3 extends away from the first structural member 2, typically at an orthogonal angle.
The second structural member 3 is formed with a top surface 8, a bottom surface 9 that lies parallel to the top surface 8, and a pair of parallel side surfaces 10, all of which intersect with the abutment surface 11.
The connector 4 has a substantially planar knife plate 12. In the preferred embodiment, the knife plate 12 is inserted into a slotted opening 13 in the second, supported structural member 3. The connector 4 also has a seat plate 14. In some installations, the end portion of the bottom surface 9 of the second structural member 3 will bear upon the seat plate 14. In other embodiments, as shown in
The connector 4 is attached to the first structural member 2 by means of one or more fastening flanges 19. In the embodiment shown in the drawings, one fastening flange 19 is provided that extends to either side of the knife plate 12. The one or more fastening flanges 19 are connected to the rear edge 20 of the knife plate 12. In the embodiment shown in the drawings, the fastening flange 19 is substantially planar member, disposed orthogonally to the knife plate 12, but the fastening flange could be disposed at a variety of different angles for making skewed connections. The fastening flange 19 preferably receives the first fasteners 5 that are driven through the fastening flanges 13 and into the first structural member 2. Preferably the first fasteners 5 that attach the fastening flange 19 to the first structural member 2 are self-drilling and self-tapping threaded fasteners or screws when the first structural member 2 is made from wood or a similar material. As shown in
As shown in
To better hide the connector 4, the end of the second structural member 3 can be routed to create a cavity that receives the one or more fastening flanges 19 and the heads of the first fasteners 5 attaching the connector 4 to the first structural member 2. Alternatively, the first structural member 2 can be routed to create a cavity in which the fastening flanges 19 and the heads of the first fasteners 5 are inserted.
The elongated slotted opening 14 in the second structural member can be a blind slot, where the slotted opening 14 in the end or abutment surface 11 of the second structural member 3 does not communicate with any other end or sides faces 10 of the second structural member 3.
As shown in
As shown
As shown in
Along each straight side wall 30, at a point between the first and second ends 31 and 32 of each straight side wall 30, a bracketing cut is made in the material of the fastening flange 19 that intersects with each straight cut 30 to form a tab end 37. This bracketing cut creating a tab end 37 defines the end of the tab 38 of the material of the fastening flange 19 disposed between the two straight side walls 30.
The tab 38 of the material of the fastening flange 19 is bent upward from the generally planar fastening flange 19 to create a guide for the angled fasteners 5. When used with fasteners 5 have a shank diameter of between 0.22 inches and 0.27 inches, the side walls 30 are preferably 1.2 inches long. The bracketing cut forming tab end 37 is made 0.36 inches from the second ends 32 of the straight side walls, and the bracketing cut is preferably made orthogonally to the side walls 30. The tab 38 between the side walls is preferably bent a little past the first ends 31 of the side walls 30. The tab 38 when it is bent upwardly has an underside that makes a 45 degree angle with the substantially planar fastening flange 19. The tab 38 projects upwardly from the substantially planar fastening flange 19 and directs the fastener to be driven at an acute angle to the fastening flange 19.
The fasteners 5 are preferably formed with flaring heads 39 and the underside of the flaring head 39 can abut against the tab end 37 when the fastener is driven into the first structural member 2.
As shown in
As shown in
The knife plate 12 preferably extends the length of the fastening flange 19 to the top of the fastening flange 19.
As shown in
As shown in
As shown in
As shown in
The one or more fastening flanges 19 of the connector 4 are formed with slotted openings 26 to guide the first fasteners 5 driven at an acute angle to the one or more fastening flanges 19. The one or more slotted openings 26 are also preferably set at an acute angle to the substantially planar knife plate 12 or the center line 54 with the upper portions of the slotted openings 26 directed inwardly to the knife plate 12 with respect to the lower portions of the slotted openings 26 such that the pin-type first fasteners 5 that are inserted upwardly into the first structural member 2 are also directed towards a plane that would be an extension of the knife plate 12 into the first structural member 2, depending on which side of the knife plate 12 the slotted opening 26 is located. Preferably, the first fasteners 5 have tips 55 that enter the first structural member 2 first and a shank 56 a portion of which enters the first structural member 2 and ends 57 that do not enter the first structural member 2 but bear against the one or more fastening flanges 19. Preferably, the first fasteners 5 driven upwardly into the first structural member 2 are disposed so that the tips 55 of these fasteners 5 are disposed above the ends 57 of these fasteners 5, and the tips 55 of these fasteners 5 are disposed closer to the center line 54 of the connector than the ends 57 of these fasteners.
In one embodiment, the fastening flange 19 and the knife plate 12 are preferably made from 3 gauge steel that is approximately 0.235″ to 0.240″ thick. The fasteners 5 and 6 are preferably Simpson Strong-Tie SDCF22614 or 27614 screws with shank diameters of either 0.22 inches or 0.27 inches, and the fasteners 5 that enter the first structural member 2 orthogonally are approximately 6″ long with the longer fasteners 5 that attach the top of the connector being approximately 10 inches long. The uppermost fasteners 5 that attach the one or more fastening flanges 19 to the first structural member 2 are disposed orthogonally to the one or more fastening flanges 19. The lowermost fasteners 5 that attach the fastening flange 19 are preferably inserted 2.250 inches above the seat plate 14 and are disposed orthogonally the one or more fastening flanges 19, and the second lowest fasteners 5 are preferably inserted 3.5″ above the seat plate 14, and are disposed orthogonally the one or more fastening flanges 19. The seat plate 14 is preferably 7.750 inches long and 5.750 inches wide. The fastening flange is preferably 14″ tall, 16.5″ tall or 19″ tall, and the connectors can achieve bearing loads of 20,000 pounds, 27,000 pounds or 35,000 pounds. In the 14″ tall embodiment, preferably 8 angled fasteners 5 and 12 orthogonal fasteners 5 are used to connect the fastening flange 19 to the first structural member. In the 16.5″ tall embodiment, preferably 12 angled fasteners 5 and 12 orthogonal fasteners 5 are used to connect the fastening flange 19 to the first structural member. In the 19″ tall embodiment, preferably 16 angled fasteners 5 and 12 orthogonal fasteners 5 are used to connect the fastening flange 19 to the first structural member. As shown in
Number | Date | Country | |
---|---|---|---|
63332266 | Apr 2022 | US |