Diaphragm Hand Pump

thingiverse

A childhood dream of mine was owning a water pump; however, I never got one, so I designed a simple pump that could potentially bring joy to other kids. To create this pump, print the base plate, cover, cylinder, handle, and two rings. Cut the diaphragm from a rubber balloon, and the valves from a thin polypropylene sheet. Attach an M6 bolt with a length of at least 65mm and a thread length of around 20mm to the handle, sawing off the head and gluing it in place. Slide the cover over the bolt and add the components one by one: nut, ring, diaphragm, ring, and bolt (refer to the section view for correct orientation). Tighten the nuts. Then, attach the valves over 8 M3x40mm bolts on the base plate, followed by the cylinder, diaphragm, and cover, securing with nuts. Attach hoses to the in- and outlets. The Creo Elements Express file is available for part modification as needed, such as for different hose diameters. Note that watertightness may be an issue; if so, add thin cardboard seals between parts.