SafeTag

The KINEXON SafeTag warns workers in real time when they're too close to each other, but it ships in a clear ID-badge sleeve on a belt clip: fine for an office, awkward on a production floor. Early testing pointed at a wristband. In the end I mapped eleven possible wearing positions against the shop-floor requirements, from chest pocket to shoe, and cut the list to four closer candidates. The existing mount was a rigid metal frame, visible and cold against the skin. The redesign replaces it with a two-part plastic housing with a soft edge.

Silicone would have gotten damaged on the shop floor, crept over time, and turned yellow like old phone cases. An isochronous stress-strain diagram and an FE analysis run out to 10,000 hours showed a rigid plastic housing could sustain that load instead. The very first, cheap prototype was just fabric and a clothes peg, and the velcro on the back exposed the tag's rear contacts for a pogo-pin charger. The exploded view shows how a rigid front cover and a flexible back plate hold the SafeTag together securely.

Round one stretches a woven band directly across the housing. No metal shows anymore, but the square shape still sits proud of the body. Round two rounds the body into a pendant and swaps the band for a double-loop silicone clip, inspired by backpack buckles built with a redundant lock. The final design was 3D-printed and tested threaded onto a woven elastic strap through a belt: flat against the body, no visible metal, none of the bulk of a badge sleeve.