Patent Application
20200109567
Stair stringers may be difficult to assemble because each step support bracket must be precisely positioned on a joist to ensure that the stairs consistently have the desired rise and run. Repeated measurements are taken to ensure proper placement of the stair support members. The present disclosure significantly simplifies the assembly of a stair stringer and virtually ensures consistent and repeatable placement of each stair support bracket. Furthermore, according to one embodiment, consistent placement of each stair support bracket is accommodated for a variety of stair angles corresponding to different rise dimensions of various stairways.
A stair stringer includes a pair of joists each including an upper wall, a first lateral wall extending from the upper wall, and a second lateral wall extending from the upper wall. At least one stair step support bracket includes a tray support wall, a first side wall extending from the tray support wall, a second side wall extending from the tray support wall, and a front wall extending between the first side wall and the second side wall. The at least one stair step support bracket is configured to set on the upper wall of one of the pair of joists and the first side wall extending downward beyond the upper wall of the one joist in position to receive a first fastener through the first side wall and into the first lateral wall of the one joist, and the second side wall extending downward beyond the upper wall of the one joist in position to receive a second fastener through the second side wall and into the second lateral wall of the one joist, wherein the tray support wall is level.
According to one embodiment, the front wall and the tray support wall of the stair step support bracket contacts the upper wall of the joist and the tray support wall is positioned level at a preset rise dimension.
According to a second embodiment, a stair assembly includes a pair of joists and at least one stair step support bracket that includes a tray support wall and a pair of side walls extending from the tray support wall and a first pair of front positioning holes and a first pair or rear positioning holes formed in the side walls and corresponding to a first rise dimension, and a second pair of front positioning holes and a second pair of rear positioning holes formed in the side walls and corresponding to a second rise dimension different from the first rise dimension. A first set pin is configured to be received by the first pair of front positioning holes or the second pair of front positioning holes, and a second set pin configured to be received by the first pair of rear positioning holes or the second pair of rear positioning holes. Receiving the first set pin through the first pair of front positioning holes and second set pin through the first pair of rear positioning holes and setting the first and second pins on the upper wall of the joist positions the tray support wall level and at the first rise dimension. Alternatively, receiving the first set pin through the second pair of front positioning holes and the second set pin through the second pair of rear positioning holes and setting the first and second set pins on the upper wall of the joist positions the tray support wall level and at the second rise dimension.
The disclosure will become more fully understood from the following detailed description, taken in conjunction with the accompanying figures, wherein like reference numerals refer to like elements, in which:
Referring generally to the figures,
The stair assembly 10 includes a pair of joists 12, a plurality of adjustable stair step supports or brackets 14, and a plurality of trays 16. According to some embodiments, the stair step supports 14 are adjustable to accommodate different angles for the stair stringer that correspond to different rises of the steps. According to an alternate embodiment, the step supports are formed to support stairs at a specific predetermined angle and rise, for example 7 inches or 7 and ¾ inches.
The joists 12 may have any suitable shape. According to one embodiment, the joists 12 are tubular with a rectangular cross section and are open at each end of the joist 12. The joists 12 include an upper wall 18, a lower wall 20, and a pair of opposed lateral walls 22. The joists may be formed of 16 gauge steel or other suitable metal. As described in more detail below, the upper wall 18 can be used to temporarily set the stair step support brackets 14 at a particular rise corresponding to a particular angle at which the joists 12 are set. According to some embodiments, the joists 12 are formed by conventional sheet metal forming techniques, such as roll forming or press brake forming.
The trays 16 are each supported by a pair of adjustable stair step support brackets 14. The trays 16 are formed of sheet metal components that are welded together or otherwise joined. The tray 16 includes an upper/rear angle bar 24 separated from a lower/front angle bar 26 by a plurality of spacing members 28. The spacing members 28 may be formed of a sheet metal formed in a U-shape. According to certain embodiments, the trays 16 are formed of sheet metal by conventional sheet metal forming techniques. Each angle bar 24, 26 may have any suitable length, for example approximately 48 inches.
Any suitable contour including a straight bottom edge 36 is contemplated by the present disclosure. The bottom edge 36 need only extend sufficiently to allow a fastener to be received through a lower portion of the lateral walls 32 and into respective lateral walls 22 of the joists 12. In certain applications, the lowest step may require a lower portion of the lateral walls 32 of the brackets 14 to be cut away by the installer such that the stair step support bracket 14 seats properly on the joist 12 without interfering with the ground or other support surface.
The stair step support bracket 14 may be formed from any suitable metal, such as 16 gauge steel or 14 gauge steel. The metal may be sheared or otherwise cut to form a blank that may be folded into the bracket 14 shown in
The sheet metal blank may be folded to form the stair step bracket 14 shown in
The front wall 34 only extends partially down the front portion of the lateral side walls 32. The rear of the bracket 14 opposite the front wall 34 may be open. The lateral walls 32 straddle the joist 12, which allows the lateral walls 32 of the stair support 14 to be secured to the lateral walls 22 of the joist 12 in multiple different positions corresponding to multiple different rise dimensions, as discussed in more detail below.
Along the bottom edge 36, for example the angled edge portion 40, a plurality of fastener holes 42 may be preformed by a punch press that shears the sheet metal. According to alternate embodiments, the fastener holes 42 may be formed by the installer in connection with installation. With reference to
Disposed at a front portion of each of the lateral walls 32 of a bracket 14 are a plurality of aligned front positioning holes 46, and disposed at a rear portion of the lateral walls 32 is a plurality of aligned rear positioning holes 48. The front positioning holes 46 disposed a greater distance from the upper wall 30 correspond to increasing rise dimensions.
To simplify installation of the brackets 14 to the joists 12, a first set pin 50 is received through a pair of front positioning holes 46, and a second set pin 50 is received through pair of rear positioning holes 48. The positioning holes 46, 48 are preformed to correspond to multiple different stair rise dimensions. Each pair of front positioning holes 46 corresponds to a pair of rear positioning holes 48 for a predetermined rise dimension. An installer may employ the same positioning holes 46, 48 for each stair step support bracket 14 to ensure each stair step of the stair assembly 10 has the same rise dimension. Installing the support brackets with the same repeatable rise dimension is simplified and precise measuring by the installer can be reduced.
The set pin 50 includes a head 52 and a shaft 54. The shaft 54 is received through the positioning holes 46, 48, and the head 52 prevents the pin 50 from sliding completely through the positioning holes 46, 48. The head 52 also allows the set pin 50 to be easily gripped by the installer. According to certain embodiments, the pin 50 is formed from a durable metal, such as steel. According to an alternate embodiment, the set pin is formed from a polymeric material, for example nylon. According to one embodiment, the set pins 50 are formed of Nylon 66. The set pin 50 may be used for temporary positioning, and therefore can be removed and discarded after the stair step support bracket is fastened to the joist. Thus, a less expensive material, such as nylon may be used for a pair of disposable set pins 50 that may be sold with the bracket 14. The set pin 50 may be fabricated using any suitable polymer forming process, such as injection molding.
To properly position the adjustable stair step support 14 to correspond to a seven inch rise, a first set pin 50 is received through a first set of aligned front positioning holes 46 in each lateral wall 32 of a bracket 14 that correspond to a seven inch rise, and a second set pin 50 is received through a corresponding set of aligned rear positioning holes 48 in each lateral wall 32 of the same bracket 14. According to one embodiment, the front positioning holes 46 may have a specific geometry, for example a hole with a diamond geometry, and the rear positioning holes 48 corresponding to a seven inch rise also has a diamond shape geometry. A stair assembly 10 with a seven inch rise is shown in
The adjustable stair step support 14 may also be used to form a stairway with a 7 and ¾ inch rise by inserting the pins 50 in other holes 46, 48, for example the front positioning holes 46 and the rear positioning holes 48 corresponding to a seven and ¾ inch rise. According to one embodiment, the seven and ¾ inch rise front and rear positioning holes 46, 48 may have the same geometry that is different from the geometry of the seven inch positioning holes. For example, the seven and ¾ inch front and rear positioning holes 46, 48 may have a hexagonal geometry. Alternatively, the seven and ¾ inch front and rear positioning holes 46, 48 may have a triangular geometry, which may be more easily identifiable to the installer to reduce mistakes in choosing the proper pair of holes 46, 48 in which to insert the set pins 50. Hex or triangular setting holes 56 and diamond setting hole 58 may be frequently employed common stair rises for example, 7 and 7 and ¾ inches.
After inserting the set pins 50 in the desired front and rear positioning holes 46, 48, for example the diamond shaped positioning holes 46, 48 that correspond to a rise of seven inches, the adjustable stair step support 14 may be set on the joist 12 such that the shafts 54 of the pins 50 rest on the upper wall 18 of the joist 12. The upper wall 30 of the adjustable stair step support 14 will be level and in a position to support a tray 16. The lateral walls 32 straddle and extend at least partially over the lateral walls 22 of the joists 12. The straddling of the lateral walls 32 position the fastener holes 42 aligned with the lateral walls 22 of the joists 12 such that they may receive fasteners 44 to secure the adjustable stair step support brackets 14 to the joist 12. According to an alternate embodiment, the adjustable stair support brackets 14 may be positioned and secured to the joists 12 prior to installing the joists at an angle to form the stair assembly 10.
A tray 16 is positioned such that the front angle bar 26 is received over part of the upper wall 30 and the front wall 34 of the adjustable stair step support 14. According to alternate embodiments, the rear angle bar 24 may overhang the tray support surface 30 and contact the upper wall 18 of the joist 12 and/or the front angle bar 26 may slightly overhang the tray support surface 30.
The upper wall 30 has a length in a range of approximately 8-12 inches, for example approximately 9 and ¾ inches. The length of the upper wall 30 corresponds to the run dimension of the stair assembly 10. The next pair of adjustable stair step support brackets 14 are then positioned behind the fastened adjustable stair step support 1 brackets 14 and contact the rear angle bar 24 or the lower brackets 14 using the set pin 50 procedure described above. In this manner, the stair assembly 10 is built. Alternatively, an upper pair of brackets 14 may be horizontally spaced apart from a lower pair of brackets a predetermined distance measured by the installer. The support surface can then be laid on and fastened to the stair assembly to form the treads and the risers (not shown) of a stairway. The treads and risers may be formed of any suitable material, such as wood or wood and polymer composite material.
The positioning holes correspond to a rise range of 6.5 inches to 8.5 inches, for example 7 and ¾ inches. Mixing and matching front and rear positioning holes yields almost infinite rise dimensions, particularly in light of the wide range of possible run dimensions. The dimensions of the adjustable stair step supports can be modified during fabrication to support a run in the range of 9 and ¾ inches to 61 inches using multiple brackets 14 positioned at the same level to support a wider tray 16.
The adjustable stair step supports 14 may be formed by punching the fastener holes 42, the front positioning holes 46, and the rear positioning holes 48 including the specific geometric shapes, such as diamond, hexagonal, or triangular. The hole punched sheet metal is then bent, for example by a press brake forming machine, to the shape shown in
A perspective view of the preset stair step support bracket 72 is shown in
To install the preset stair step support bracket 72 to the joists 12 and form the stair assembly 70, the preset stair support bracket 72 is positioned on the angled joist 12 such that a lower edge 88 of the front wall 78 rests on the upper wall 18 of the joist 12. A rear edge 90 of the upper wall 74 also rests on the upper wall 18 of the joist 12. The upper wall 74 of the preset support 72 is level, the lateral walls 76 straddle the joist 12, and the preset stair step support 72 is in position to form stairs of a certain preset rise, for example 7 inches. Fasteners 44 are received through the fastener holes 42 and penetrate the lateral walls 22 of the joists 12. The tray 16 is positioned over the preset stair step supports 72, and another preset stair step support 72 is positioned behind the fastened preset support 72 in contact with the rear angle bar 24 of the tray 16 or lower preset stair support bracket 72, as shown in
As utilized herein, the terms “approximately,” “about,” “substantially”, and similar terms are intended to have a broad meaning in harmony with the common and accepted usage by those of ordinary skill in the art to which the subject matter of this disclosure pertains. It should be understood by those of skill in the art who review this disclosure that these terms are intended to allow a description of certain features described and claimed without restricting the scope of these features to the precise numerical ranges provided. Accordingly, these terms should be interpreted as indicating that insubstantial or inconsequential modifications or alterations of the subject matter described and claimed are considered to be within the scope of the disclosure as recited in the appended claims.
It should be noted that the term “exemplary” and variations thereof, as used herein to describe various embodiments, are intended to indicate that such embodiments are possible examples, representations, or illustrations of possible embodiments (and such terms are not intended to connote that such embodiments are necessarily extraordinary or superlative examples).
The term “or,” as used herein, is used in its inclusive sense (and not in its exclusive sense) so that when used to connect a list of elements, the term “or” means one, some, or all of the elements in the list. Conjunctive language such as the phrase “at least one of X, Y, and Z,” unless specifically stated otherwise, is understood to convey that an element may be either X, Y, Z; X and Y; X and Z; Y and Z; or X, Y, and Z (i.e., any combination of X, Y, and Z). Thus, such conjunctive language is not generally intended to imply that certain embodiments require at least one of X, at least one of Y, and at least one of Z to each be present, unless otherwise indicated.
References herein to the positions of elements (e.g., “top,” “bottom,” “above,” “below”) are merely used to describe the orientation of various elements in the FIGURES. It should be noted that the orientation of various elements may differ according to other exemplary embodiments, and that such variations are intended to be encompassed by the present disclosure.
Although the figures and description may illustrate a specific order of method steps, the order of such steps may differ from what is depicted and described, unless specified differently above. Also, two or more steps may be performed concurrently or with partial concurrence, unless specified differently above. All such variations are within the scope of the disclosure.
It is important to note that the construction and arrangement of the assemblies as shown in the various exemplary embodiments is illustrative only. Additionally, any element disclosed in one embodiment may be incorporated or utilized with any other embodiment disclosed herein. For example, the exemplary embodiment described with respect to
This application claims the benefit of and priority to U.S. Provisional Application for Patent Ser. No. 62/742,829, entitled “Stair Stringer with Rise Adjustable Step Supports,” filed on Oct. 8, 2018, the disclosure of which is hereby incorporated by reference.
| Number | Date | Country | |
|---|---|---|---|
| 62742829 | Oct 2018 | US |
