Elevated knife plate bracket
Brackets for posts and methods of using the same are described. The brackets may include a lower base plate with one or more fastener holes to connect a bracket to a support surface, an upper base plate to support a post and which may include one or more access holes aligned with the lower plate fastener holes and a knife plate that extends above the upper base plate and into a slot in the post. The brackets may also include one or more walls that extend from the lower base plate to the upper base plate to support the upper base plate. The knife plate may extend from the lower base plate through a slot in the upper base plate and may include one or more ledges that support the upper base plate.
1 . A method of securing a vertical post to a support surface, the vertical post comprising a vertical post top, a vertical post bottom, a vertical post height extending from the vertical post top to the vertical post bottom, a vertical post thickness generally perpendicular to the vertical post height, a vertical post slot comprising a vertical post slot bottom located at the vertical post bottom, a vertical post slot top, and a vertical post slot height extending from the vertical post slot top to the vertical post slot bottom generally parallel to the vertical slot height, the method comprising the steps of:
a) providing an elevated knife plate bracket comprising:
i) a lower base plate comprising a lower base plate bottom surface configured to rest on the support surface, a lower base plate top surface located above the lower base plate bottom surface, a lower base plate height extending from the lower base plate bottom surface to the lower base plate top surface, a lower base plate length generally perpendicular to the lower base plate height, a lower base plate width generally perpendicular to the lower base plate height and length, and a lower base plate fastener hole extending through the lower base plate from the lower base plate bottom surface to the lower base plate top surface, the lower base plate fastener hole having a lower base plate fastener hole height generally parallel to the lower base plate height, a lower base plate fastener hole width generally perpendicular to the lower base plate fastener hole height and a lower base plate fastener hole length generally perpendicular to the lower base plate fastener hole height and width;
ii) an upper base plate located above the lower base plate and comprising an upper base plate bottom surface facing the lower base plate top surface, an upper base plate top surface located above the upper base plate bottom surface and configured to receive the bottom of the vertical post, an upper base plate height extending from the upper base plate bottom surface to the upper base plate top surface and generally parallel to the lower base plate height, an upper base plate length generally perpendicular to the upper base plate height, an upper base plate width generally perpendicular to the upper base plate height and length, and an upper base plate access hole extending through the upper base plate from the upper base plate bottom surface to the upper base plate top surface, the upper base plate access hole located directly above the lower base plate fastener hole and having an upper base plate access hole height generally parallel to the upper base plate height, an upper base plate access hole width generally perpendicular to the upper base plate access hole height and an upper base plate access hole length generally perpendicular to the upper base plate access hole height and width;
iii) a knife plate extending upward from the upper top plate surface at an angle of about 90 degrees relative to the upper base plate top surface, the knife plate comprising a knife plate top located above the upper base plate top surface, a knife plate bottom, a knife plate height generally parallel to the upper base plate height, a knife plate front, a knife plate rear, a knife plate thickness extending from the knife plate front to the knife plate rear and generally perpendicular to the knife plate height, and at least one knife plate fastener hole located above the upper base plate top surface, the at least one knife plate fastener hole having a length extending generally perpendicular to the upper base plate height, the knife plate fastener hole extending through the knife plate from the knife plate front to the knife plate rear; and
iv) a support wall extending between the lower base plate and the upper base plate and at least partially supporting the upper base plate, wherein the lower base plate fastener hole comprises four circular lower base plate fastener holes, wherein the upper base plate access hole comprises four upper base plate fastener holes, wherein each lower base plate fastener hole is located directly below an upper base plate access hole, wherein the support wall comprises four semi-cylindrical support walls, wherein each of the respective four semi-cylindrical support walls partially surrounds one of the four circular lower base plate fastener hole and one of the upper base plate access holes, and further wherein each of said semi-cylindrical support walls are separated from the knife plate by a space and are not attached to the knife plate;
b) placing the lower base plate bottom surface on the support surface;
c) placing a lower base plate fastener through a lower base plate fastener hole and into the support surface to secure the elevated knife plate bracket to the support surface;
d) placing the vertical post bottom directly on top of the upper base plate top surface so that the knife plate extends upwardly into the vertical post slot; and
e) placing a knife plate fastener at least partially through the vertical post thickness, and through the knife plate fastener hole to secure the vertical post to the elevated knife plate bracket.
2 . The method of claim 1 wherein the knife plate bottom is located between the upper base plate bottom surface and the lower base plate top surface.
3 . The method of claim 1 wherein the upper base plate comprises an upper base plate knife plate slot extending from the upper base plate top surface to the upper base plate bottom surface, the upper base plate knife plate slot having an upper base plate knife plate slot height generally parallel to the upper base plate height, an upper base plate knife plate slot width generally perpendicular to the upper base plate knife plate slot height, and an upper base plate knife plate slot length generally perpendicular to the upper base plate knife plate slot height and width, the upper base plate knife plate slot length larger than the upper base plate knife plate slot height and width and further wherein the knife plate extends from the lower base plate through the upper base plate knife plate slot and at least two inches above the upper base plate top surface.
4 . The method of claim 3 wherein the knife plate comprises a knife plate left side, a knife plate right side, a knife plate width extending from the knife plate left side to the knife plate right side and generally perpendicular to the knife plate thickness and the knife plate height, wherein the knife plate comprises a knife plate upper portion located above the upper base plate top surface, a knife plate laterally extended portion located below the upper base plate bottom surface, the knife plate upper portion and the knife plate laterally extended portion each having a width generally parallel to the knife plate width, the knife plate laterally extended portion comprising a top comprising a top ledge located adjacent to the upper base plate knife plate slot, confronting the upper base plate bottom surface and at least partially supporting the upper base plate, the width of the knife plate laterally extended portion greater than the upper base plate knife plate slot length and the knife plate upper portion width.
5 . The method of claim 4 wherein the top ledge comprises a left top ledge located to the left of the upper base plate knife plate slot and confronting the upper base plate bottom surface, and a right top ledge located to the right of the upper base plate knife plate slot and confronting the upper base plate bottom surface.
6 . The method of claim 4 wherein the lower base plate bottom further comprises a lower base plate knife plate slot receiving the knife plate bottom, the lower base plate knife plate slot having a lower base plate knife plate slot height generally parallel to the lower base plate height, a lower base plate knife plate slot width generally perpendicular to the lower base plate knife plate slot height, a lower base plate knife plate slot length generally perpendicular to the lower base plate knife plate slot height and width, the lower base plate knife plate slot length larger than the lower base plate knife plate slot height and width, wherein the knife plate laterally extended portion comprises a bottom comprising a bottom ledge located adjacent to the lower base plate knife plate slot and confronting the lower base plate top surface, the width of the knife plate laterally extended portion greater than the lower knife base plate knife plate slot length and the knife plate upper portion width.
7 . The method of claim 6 wherein the bottom ledge comprises a left bottom ledge located to the left of the lower base plate knife plate slot and confronting the lower base plate top surface, and a right bottom ledge located to the right of the lower base plate knife plate slot and confronting the lower base plate top surface.
8 . The method of claim 1 wherein the upper base plate is located directly above the lower base plate.
9 . The method of claim 8 wherein the upper base plate width is generally parallel to and substantially equal in size to the lower base plate width and the upper base plate length is generally parallel to and substantially equal in size to the lower base plate length.
10 . The method of claim 1 wherein the upper base plate bottom surface is located between about 1 and about 3 inches above the lower base plate top surface.
11 . The method of claim 1 wherein the knife plate is located approximately in the center of the upper base plate width and/or upper base plate length.
12 . The method of claim 1 wherein step e) comprises placing a knife plate fastener through a first side of the vertical post, through the knife plate fastener hole, and out the second side of the vertical post to secure the vertical post to the elevated knife plate bracket.
13 . The method of claim 1 wherein the support surface is comprised of concrete and further wherein the lower base plate fastener is rebar.
14 . The method of claim 1 wherein the knife plate fastener is oriented perpendicular to the upper and lower base plate heights.
15 . The method of claim 1 wherein the knife plate height is at least five times greater than each of the lower base plate and upper base plate heights.
16 . The method of claim 1 wherein each of the lengths and widths of the upper and lower base plates is at least five times greater than the heights of each of the upper and lower base plates.
17 . The method of claim 1 wherein the knife plate height is at least five times greater than the knife plate thickness.
18 . The method of claim 1 wherein the upper base plate top surface is configured to support a vertical post bearing a load of at least one hundred pounds.
19 . The method of claim 1 wherein the lower base plate bottom surface is generally flat, not considering the fastener holes, such that the lower base plate bottom surface is generally flush against the support surface upon which the lower base plate is placed.
20 . The method of claim 1 wherein the upper base plate top surface is generally flat, not considering the access holes, such that the upper base plate top surface is generally parallel to the support surface above which the knife plate bracket rests.
21 . The method of claim 1 wherein the knife plate fastener is a dowel.
22 . The method of claim 1 wherein the knife plate fastener hole comprises three knife plate fastener holes arranged in the pattern of an isosceles triangle.