Doorknob Handle

thingiverse

Update https://www.thingiverse.com/thing:4228668 - more options, more parameters, customizable, stronger joint. Doorknob Handle ============== Unfortunately this was inspired by the COVID-19 Pandemic *If you think these may help you, your family, or others, please feel free to customize and print as many as needed.* *If you would like to manufacture and commercialize this product please contact me, we can work something out.* COVID-19 is spread like cold and flu viruses via contact with droplets from an infected individual. It has been proven viable in the air for 3 hours and has been demonstrated to contaminate surfaces for up to 3 days where it may be picked up on hands. A potential vector for infection is touching your face (mouth, nose, or eyes) with the virus on your hands. Frequent thorough hand washing with soap and water and minimizing touching your face are suggested ways to reduce the likelihood of contracting the COVID-19 infection. Centers for Disease Control: https://www.cdc.gov/coronavirus/2019-ncov/prepare/transmission.html The use of round doorknobs require a hand to grasp and twist to open a door. Entry and exit doors in particular must be touched by everyone entering a household, are usually touched before having access to a sink, and after potentially touching public handles, railings, shopping carts, elevator buttons, ATM's, money, gas pumps, rest rooms... Doors with handles can be opened with elbows and forearms which are less likely to relay infection. This handle is easy to print and clamps firmly, gently, and non-destructively to round doorknobs. *An added bonus: Handles are easier to open while carrying packages, groceries, or beverages!* Styles -------- There are two styles, flat (push) and curved (pull). The flat version will likely print more easily and is perfectly fine for doors that push open. The curved version is tailored for doors that need to be pulled and in general is more universal. I can open our doors inside and out with my elbows, but even if you can't get your elbow in there, at least you can limit exposure to one finger rather than your whole hand grabbing a doorknob. You can customize the length, style, size of the doorknob and more in the OpenSCAD parameters in the file (even more if you dig into the code - have fun!). Fitting -------- The default size is 54mm diameter, 23mm thick doorknob. The model can accommodate slightly larger and smaller sizes as is. To fit your doorknob you may either scale the STL file before printing (measure your doorknob diameter D and scale by D/54), or adjust the parameters in OpenSCAD, render (F6), save STL, and then print. Installation ------------- 1. Place the handle ring over the doorknob. 2. Tighten the screw until snug. 3. If necessary, wrap a rubber band around one arm of the handle ring prior to installation. 4. Test the handle by opening the door with your elbow or knee. Note, there should be enough friction to open the door with your elbow or knee but the plastic handle may not be able to grab the smooth metal doorknob with enough force to secure it against any force without slipping. Simply slide it back to the original position or you can try installing a rubber band for more "_gription_". Conclusion ---------- I will never know, but I hope this is helpful. I hope this has a chance of preventing at least one person from getting sick - even if it is not against COVID-19, perhaps against one of the 200 viruses known to cause the common cold, or influenza (8,200 deaths in US in 2019), or Norovirus... Maybe you just want to make it easier to bring in your groceries. If you would like to support invention for the greater good, you can donate to your local makerspace... or mine: http://blog.workshop88.com/ http://blog.workshop88.com/membership/#donations *(they will need support during these times of social distancing and isolation)* Also, please don't judge my filthy garage/workshop doors too harshly... I have to go scrub them now. *Stay well, wash your hands, and don't touch your face!*