This application claims the benefit of U.S. Pat. No. 7,627,955 to Perkey, known as the Stringer Guide Template.
The present invention is a tool with the actual shape and size of a portion of a stair stringer. The present invention also has an adjustable feature, which allows the calculated dimension of rise to be set and secured. The said adjustable feature, for the riser dimension, is adjusted by sliding Section #1, Part #1 into Section #2, Part #2, using increments labeled #7 on said present invention. Then secure by tightening Wing nuts #17 onto machine pressed threaded Stud #10 to hold Section #1 secure to Section #2. The said present inventions function is to simplify and speed up the process, whereby said stair stringers are laid out ready for cutting to final shape.
This present invention is a carpentry tool used for the complete layout of stair stringers. The said tool relates to the performances of other tools such as the L-shaped framing square, multipurpose square, speed square, and various other tools.
Various devices have been designed in the past to perform the task of laying out stair stringers, but none are as fast and simple as this present invention.
The L-shaped framing square is the most universally recognized tool for performing this task. When using said tool for layout of stair stringers, its use requires the user to align two marks of measurement, one on each leg of the tool. This is often a somewhat clumsy method of operation, for after one number is aligned and when the other leg is moved to align the second number, it often causes the first leg to shift off position, making it necessary to realign a second and sometimes a third time. The said tool also must be spun multiple directions for final layout marks, which can be confusing to the novice craftsman.
Triangular shaped squares such as U.S. Pat. No. 4,742,619 to Swanson, commonly known as “speed squares”, are simply too short for accurate layout increments pertaining to stair stringers.
The multipurpose square U.S. Pat. No. 5,727,325 Barry D Mussell, has the problem of being too short for layouts of stair stringers made to receive 2″×12″ treads. It also has an edge on the handle that projects out from the faces of body, making it extremely difficult to get accurate markings needed for said layouts.
The Stringer Guide Template U.S. Pat. No. 7,627,955 Thomas R Perkey, has the problem of being unable to adjust the tread length and also has a weakness in the structure when the tool is separated.
From the operational descriptions and drawings of this present invention, it becomes evident that the said invention in the embodiments shown by
Many prior art squares perform a variety of specialized functions, however, none of them are able to execute the process of stair stringer layout as fast and effectively as this present invention.
It is the object of the present invention to overcome the shortcomings of the prior art squares and the more traditional methods of laying out a stair stringer. Whereby, the said present inventions unique shape, which is likened to the actual shape of a stair stringer, gives said present invention a simpler, faster, and more accurate method of layout.
A template guide 1A, one embodiment of the present invention is illustrated in
This present invention can be either laser cut out of various materials, such as, aluminum, steel, etc. or made by injecting plastic into an injection mold.
The increments for top tread allow user to identify measurements on said tread. Labeled #4 on drawings 1-7.
The increments for adjusting rise are measurements allowing rise to be established between 6 inches and 7¾ inches. Labeled #7 on drawings 1-7.
The slots, labeled #14, in legs of small U-shaped member labeled #3 allows part #3 to be adjusted to part #2 and secured by wing nuts labeled #17.
The slots, labeled #8, in legs of large U-shaped member labeled #1 allows part #1 to be adjusted to part #2 and secured by wings nuts, labeled #17.
All four legs of part #2 have embedded threaded studs labeled #10 and #13 and are machine pressed into the body of part #2.
The straight lines with arrows below and above label #9 are the control line when the said present invention is being adjusted to desired height of rise, this line must be aligned evenly with calculated riser height by increments labeled #7.
The increments labeled #12 are measurements to be used when adjusting tread length.
The riser indications are labels to indicate the riser of stair stringer. Labeled #6 on drawings 1-7.
Label for bottom riser indicates the bottom rise of stair stringer labeled #15 on drawing 1-7.
Increments for bottom riser are measurements so user can mark proper height of bottom riser of stair stringer. Labeled #16 on drawing 1-7.
Label for bottom and middle tread identifies one part of present invention. Labeled #11 on drawings 1-7.
Label for top tread signifies to the user the first step of stair stringer. Labeled #5 on drawings 1-7.
Wing nuts for securing part #1 and part #3 to part #2 of stair stringer at desired dimension. Labeled #17 on drawings 1-7.
The large U-shaped member of the present invention, shown as section #1. Labeled part #1 on drawings 1-7.
The small U-shaped member of the present invention, shown as section #3. Labeled part #3 on drawing 1-7.
The main body of the present invention, shown as section #2. Labeled part #2 in drawings 1-7.
(16) Increments for bottom riser
(17) Wing Nuts
Number | Name | Date | Kind |
---|---|---|---|
164008 | Kirkpatrick | Jun 1875 | A |
341126 | Boyer | May 1886 | A |
493048 | Van Alstine | Mar 1893 | A |
539534 | McKinny | May 1895 | A |
796030 | Baumgartner | Aug 1905 | A |
858431 | Wiegmann | Jul 1907 | A |
947422 | Sherry | Jan 1910 | A |
1527647 | Heinen | Feb 1925 | A |
3478434 | Catalano | Nov 1969 | A |
4742619 | Swanson | May 1988 | A |
4833791 | Campbell | May 1989 | A |
4882846 | Reed | Nov 1989 | A |
5388340 | Marty | Feb 1995 | A |
5440818 | Mailhot | Aug 1995 | A |
5692357 | McCain | Dec 1997 | A |
5727325 | Mussell | Mar 1998 | A |
6260283 | Abernathy et al. | Jul 2001 | B1 |
7627955 | Perkey | Dec 2009 | B1 |