Total Surface Contact ThreadsTM (TSCTsTM) are a new genre of threaded connections, with inherent properties
that resist loosening, fatigue, corrosion, and have been shown to be over
than traditional threads (US fastener journal). There are several types of TSCTs, each with a number of geometric parameters
that enable a degree of engineering precision and control currently unavailable. By utilizing TSCTs, engineers
will be able to make their products safer, cheaper, and do things otherwise impossible prior to TSCTs.
TSCTs common characteristic is the elimination of the clearance space that all other threads have. There is no room for environmental corrosion or the corrosion from unlike metals (AL-CU) in high voltage connections. There is no room for movement from hot/cold expansion or load cycling. There is no room to absorb vibrational movement, it is transmitted. Ideally Total Surface Contact Threads would seal, however in practice fabrication tolerances will require a microscopic layer of sealant to make stronger, more durable pneumatic and hydraulic connection. All the surfaces engage at the same time and same terminal position maximizing their coefficient of friction. Compared to the 30% - 35% of standard threads, this means a stronger hold or fewer threads to do the same job. Eliminating the need for a clearance space opens a range of engineered applications.
All TSCTs have morphing surfaces, most are either a cone, concave or convex shape; there are others. This allows the unique freedom to design how stresses are distributed. One structural component that directed stress linearly through the fastener increased it's tensile strength over 25%. Another set have been designed to increase stress in the middle and reduce on the ends for pipe and container applications. They can allow quick connecting with precision things like electrical plugs, position and T_align a thousand electronic contacts replacing pins or aligning fiber optic surfaces. Also, morphing threads can fasten multiple parts laterally. and around corners.
Some TSCT's can be incorporated as a valve. The plunger, control thread and seat would be replaced with a male threaded plunger and female threaded seat with combined thread control. This is a repeating sealed connection. As a 3D printed replacement component, it could be a fast fix till industrial parts are delivered. 3D printed parts eliminate the need to stockpile and valves could be made on demand.
Conic Thread_SO14.pdf Three of the Total Surface Contact Threads have US patents; there are others. Their basic principles can be found in the American Fastener Journal articles Concentric Thread Principals , Wave Thread Principles , and Conic Thread Geometry 3.5 .
The Wave ThreadTM is a stack of expanding circles that follow are spiraling helix. That sentence is the core innovation of this new chapter in mechanics. This is the first TSCT type that optimized the even distribution of stress with the unintended effect of increasing its load bearing tensile strength over 25%. It will make stronger aerospace and automotive fasteners. This will replace the USB plug in consumer electronic connections with a quarter turn connection that will not pull out and be water tight. This will replace battery connection with longer lasting high surface contacts that will not loosen.
The non-circular Concentric ThreadTM is a rotating stack of ANY two dimensional shape, except a circle. Using a circle would make a cone, not a Concentric Thread. The two dimensional shapes can be a square, heart, lizard, or the map of Europe, anything. This will make limitless consumer applications including unique containers. A curved axis concentric thread can screw around a corner reducing the net amount of fastening. The engineering is an application of two intersecting perpendicular planes. Some concentric thread shapes will fasten laterally while engaging linearly, the sides pull into thread. This allows multiple parts to be connected by one engagement. This will be one of the broadest new mechanics chapter.
The Conic ThreadTM has the male and female profiles on the same plane at its terminal position. It can be any current thread profile or new geometries. This was the first to eliminate the clearance space. It is another choice of threads to morph, to seal, to connect, to create.
Every discovery has new terms, an expansion of old terms and odd quirks. The limits of every Total Surface Contact Thread design is the female thread, no metaphor intended. It determines how small and tight the internal surface can be fabricated with the external male thread generated automatically. The odd quirk is the concave female shape has a convex shaped mate to show characteristics that otherwise could not be seen.
The work on Total Surface Contact Threads has been mostly software development with 3D printing, 3-axis machining and making molds. The future of 3D printing with high resolution will allow a tremendous range of characteristics to be developed, tested and marketed as 3D printable products. Toy robotics with hydraulic and pneumatic components will lead to industrial ones. 3D printed parts are a whole new cauldron what individuals will be able to make.
Total Surface Contact Threads are the invention of Dale E. Van Cor from the American town of Winchester, New Hampshire. He is supported by his wife Wanda. His mathematician is Dr. Ronald Tourgee from Spofford, NH, and his patent attorney is Mike Persson from Laconia, NH. There are two more patents pending and two more in the works. His current efforts are on developing 3D printed pipe connections that will seal at 100psi for plastic and 1000 psi for metal without glue or gaskets.
Dale Van Cor's talent is making his visions into physical parts. Getting applications to market requires developing the engineering tools to predict performance and failure of applications. This will take the resources and talents of others. This is a new genre in physical connections and there is more.
last updated 02/17/2018