Duo-Shock Taser

Duo-Shock Taser Case Study



Ensuring the personal safety of oneself and one’s family from home intruders is of deep concern for many people. One option often used by home owners is possession of a gun, but the implications of using lethal force as well as the potential for accidental discharge of the weapon can be worrisome. As part of an International Design Competition, Andrew Keel, a student at North Carolina State University, developed a different option designed to incapacitate an assailant without taking a life. The Duo-Shock Taser is specifically tailored for both home defense and self-defense, and offers a non-lethal alternative for people who desire to protect themselves and their families.


The Duo-Shock Taser was designed using a form factor that follows traditional firearm design for intuitive use and ease of learning. The taser includes two additional features to protect the individuals using it. First, a built-in video camera provides reliable evidence of its usage, to legally protect the defender and to help law enforcement personnel in addressing the situation. Second, the ammunition used by the Duo-Shock Taser, called “shock-shot”, is a projectile that detaches from the taser as it is fired, so that the user is not tethered to the assailant. As it flies, the shock-shot spreads open so that it is difficult for the user to miss the target.


Model Solution became involved with the students in the design competition, and built a prototype model of the Duo-Shock Taser. Several issues were encountered during the model-making process, and the Model Solution engineers were able to work with the student to resolve them.
Model Solution identified several issues with the CAD file provided by the student. For example, the model did not exhibit left/right symmetry, there was interference and non-uniform gaps between different parts of the model, and the parts could not be correctly assembled from the structural design.
The model also had several functional aspects that needed to be addressed. It required working LED lights behind the parting lines that were controlled by a tact button. The model had removable parts that needed to be designed to fit together and then detach. The MS engineers suggested using a clear polished acrylic, and painting the back surface black, to mimic the glass look that the student desired for the camera and scanner parts. Finally, rather than using an elastomer for the grip, the MS engineers suggested using soft-touch paint for the desired rubbery feel.


Once the design issues had been resolved, the prototype model was built. The process for building the model included structural design work, CNC machining, wet-sanding, anodizing, painting, screen printing and final assembly. The Duo-Shock Taser was built from ABS plastic and polished aluminum. Magnets were used for fitting the detachable taser portion to the handgun frame.


The Duo-Shock Taser offers a rugged yet refined aesthetic that differentiates the device from regular, lethal firearms, while instilling confidence in the user. Taser cartridges can be quickly and easily replaced, a critical feature in high-stress situations. Finally, a safety on the back of the device uses a thumb-print scanner that allows owners to activate the Duo-Shock Taser quickly while preventing misuse if it were to fall into the wrong hands.


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Duo-Shock Taser
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