#HTE

Reader Submitted: 3d-printed “Hands Free” Door Handle Attachment Uses Body Heat Reacting Pigment

The project is conceived on the idea of using your arm or elbow to open a common round doorknob. The intention is for it to be used during the Covid-19 crisis. Therefore, the design is open source and free to be modified for specific dimensions. All parts of the assembly can be 3d printed, including the mechanical parts. The attachment allows a door to be pushed and pulled without spreading or having hand contact with viruses and pathogens. The goal was to achieve a simple design can be easily 3d printed and distributed through the maker community around the globe. One distinct feature of this model is that it is compatible with cylindrical doorknobs which are common in different parts of the globe. Thermochromic pigments were implemented on the door-attachment so that surface leaves a temporary trace of discoloration on itself if someone touched it with their hands.

Attachmentassembled in a typical round knob and a person about to open the door using the arm

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Opening motion of the door knob attachment for a push opening door.

Summary of usability of dorrhandle attachment

Installed clamp with pull lever option assembled (for pull doors)

main 3d printed parts and assembly options.

Prototypes ans Iterations of design process