Many years ago I either built or repaired a wood pump for my sister Karen. This spring she informed me the old one was shot and I needed to build her a new one. Here is a picture of the old one........the 1/4" plywood bottom had rotted out and fallen out:
I searched my records, and I did not find any plan or design for making this........so from the worn out model, I made a Google Sketchup of the design:
I changed the 1/4" plywood bottom to regular 3/4" thick stock, with a 1/2" gap between boards to let the rain drain out. The two green uprights are from a landscaping timber which is round with 2 flats as shown.
I had quite a time designing the handle. It was too large to scan the old one and import into Sketchup. I traced the old one on cardboard, then used it to design something similar in Sketchup. This picture shows drilling the dowel hole in the handle:
Here are photos of the completed new pump:
Concluding Thoughts on this Project:
I designed the top pieces of the pump to be removable by having them rotate on a 3/4 inch dowel on the centerline. If the unit needs repair, I can just build a new piece in my workshop versus hauling the whole thing home. I mounted the spout with a 3/4" horizontal dowel also.
The pump handle usually breaks at the top, like the old one shown above. I don't know how to make it any stronger, except maybe make it out of 3 glued up laminations using external plywood. Now that I have the handle pattern captured in Sketchup, it is not big deal to make a new handle, since Sketchup prints out the to-scale pattern (you have to glue up 3 sheets but it works ok).