Patent Application
20090057316
The present invention relates to a coil nut developed to fit onto a ⅜-7 lag bolt and also designed to retrofit onto existing products. More particularly, the present invention relates to a coil nut having a nut body with first and second ends and an aperture therebetween. A continuous thread is formed within the aperture having a size of seven threads per inch. Each of the individual threads are spaced such that the distance between a center of a first thread and a center of a second thread is 0.143 inches.
Conventional coil nut apertures have diameters equal to or larger than six threads per inch of space for fitting ½-6 lag bolts. This sizing affects the inclination to gather dirt. Also, the conventional coil nuts with less open threads are less likely to seize the nut together with a bolt.
Often, conventional coil nuts are expensive to manufacture and do not fit small product sizes to provide a rigid interface between a bolt and a nut. With restricted sizes, multiple tools are needed to work in conjunction with a ⅜-7 lag bolt, while providing the same design benefits as a ½″ model.
A need exists for a coil nut that provides the same design benefits as the ½″ model at a lower cost. A need also exists for providing a coil nut designed to fit existing products that can be retrofitted into existing installations as easily as the replacement of the original insert.
Conventional nuts include 16 threads per inch. This creates problems because this configuration does not detract debris. The debris interferes with the connection between the bolt and the nut when the two are coupled. A need exists for a coil nut with a coarse structure that decreases the amount of dirt stuck between the individual threads of the nut.
Designs of coil nuts are disclosed in U.S. Pat. No. 5,088,868 to Cosenza et al., U.S. Pat. No. 6,726,420 to Ward et al., and U.S. Pat. Appln. No. 2007/0031210 to Schmidt, which are hereby incorporated herein by reference. While these prior art coil nut designs cause debris to be deflected, they are oftentimes too large for the desired applications.
Consequently, a need exists for a less expensive coil nut that can deflect debris from between the threads with as many threads per inch as possible.
Accordingly, an object of the present invention is to provide a coil nut with seven threads per inch.
Another object of the invention is to provide a coil nut having a retrofit feature to easily work with products from the original insert.
A further object of the invention is to provide a coil nut having a retrofit feature to fit a variety of bolt lengths.
Still another object of the invention is to provide a coil nut having a ⅜-7 size that works in conjunction with a ⅜-7 lag bolt while providing the same design benefits as a ½″ model.
The foregoing objects are basically attained by providing a coil nut having a body with first and second ends and an aperture therebetween for receiving the bolt. A continuous thread is formed between the first and second ends within the aperture. The size of the thread is seven threads per inch to be fitted onto a ⅜-7 lag bolt.
By forming the coil nut in this manner, the coil nut can fit a ⅜-7 bolt, while inexpensively providing the same design benefits as a ½″ model. This design enables the nut to withstand debris since the orientation of the ⅜-7 size creates a more course structure than conventional nuts. Also, the coil nut is sized for existing products so it can be retrofitted into installations as easily as the replacement of the original insert.
As used in this application, the terms “top”, “bottom”, and “side” are intended to facilitate the description of the coil nut, and are not intended to limit the description of the coil nut to any particular orientation.
Other objects, advantages, and salient features of the present invention will become apparent from the following detailed description, which, taken in conjunction with the annexed drawings, discloses preferred embodiments of the invention.
Referring to the drawings which form a part of this disclosure:
Throughout the drawings, like reference numerals will be understood to refer to like parts, components, and structures.
As seen in
The coil nut 10 is preferably manufactured of 18-8 stainless steel or an equivalent material. The shape of the nut 10 can be square or hexagonal. As illustrated in
The aperture 18 is located in the middle of the nut 10 such that the center of the aperture 18 is also the center of the nut 10. Therefore, the distance 36 from the center of the nut 10 to the outer edge of the nut is equal to ½ the length or width of the nut 10. Thus, the distance 36 is approximately 0.31 inches.
The pitch 38 of the continuous thread 20 relates to the number of threads per inch applied to a single diameter. Pitch 38 takes into account the minor diameter 42 and the major diameter 44 of the nut 10. The minor diameter 42 is the smallest diameter of the thread 30 and the major diameter 44 is the largest diameter of the nut 10. Therefore, the angle 40 of the continuous thread 20, as illustrated in
Turning to
The continuous thread 20 includes seven individual threads 30 per inch. Each of the threads 30 extends from an interior column or root 46 along the aperture 18 to connect the crest or outer ends of each of the individual threads 30. From this root 46, each of the threads 30 has a protruding distance away from the root 46 towards the outermost ends or crests of the threads 30. As illustrated in
Each thread 30 further includes a peak 52 along the planar region of its exterior edge. The peak 52 is the planar region along the widest edge of the thread 30. The width 50 of the planar region is approximately 0.032 inches.
The specific size of the thread 20 is unique to the coil nut 10 because it provides a solution for the smaller size bolt and is designed to work in conjunction with a ⅜-7 lag bolt. Each of the individual threads 30 is spaced along the aperture 18 at distances of approximately 0.055 inches apart from each other as measured from the point where each thread 30 abuts the root 46, and illustrated by distance 54.
One of the coil nut 10 advantages is to fit previously designed products that need larger, more open threads that are less inclined to gather dirt. The extended distance between the threads 30 and the measurements disclosed herein allow the coil nut 10 to withstand debris that passes through the threads because of the course structure resulting from the specific size.
As seen in
While a particular embodiment has been chosen to illustrate the invention, it will be understood by those skilled in the art that various changes and modifications can be made therein without departing from the scope of the invention as defined in the appended claims.
