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Air Compressor: Twin Pump-Cylinder, Water-Cooled (Shop Notes, 1912)
A simple compressor that fills a tank to about 50 lb: two bought cast-iron well-pump cylinders, 2 1/2 in bore, driven alternately by a rocking arm from a crank, with check valves in and out and a water jacket pipe to cool them.
Source: Popular Mechanics Shop Notes for 1912, pp. 1708-1709. Unknown: tank, pipe sizes. Picture: Figs. 1-2 of the book.
Intermediate
Unknown
Instructions
1
1
Pipe the two cylinders
Pipe the two cylinders
Take two ordinary cast-iron open-well pump cylinders, 2 1/2 in bore, bought complete with guide rods and plungers. Join their open ends with tees to a cross pipe C, and fit a packing box from an old valve (A, B) into each tee so the plunger rods D and E pass through (Fig. 1).
Materials for this step:
Unknown Metal2 pump cylinders with plungers
Steel Pipe (thick-walled, threaded ends)1 pipe C
Threaded Pipe Fitting2 tees
Unknown Packing2 packing boxesTools needed:
Pipe Wrench2
2
Fit the valves
Fit the valves
On the outer end of each cylinder fit an inlet check valve (H, I) and an outlet valve (J, K), the outlets joined to pipe L running to the tank.
Materials for this step:
Check Valve (Non-Return)4 H, I, J, KSteel Pipe (thick-walled, threaded ends)1 pipe LThreaded Pipe Fitting1 piece
Unknown Material1 air tankTools needed:
Pipe Wrench3
3
Water-cool it
Water-cool it
Run cooling water through pipe C, set by valve M in and valve N out, so there is no pressure on the water to push it into the air chambers O and P.
Materials for this step:
Globe Valve2 M and NTools needed:
WaterPipe Wrench4
4
Fit the crank drive
Fit the crank drive
Drive it from a shaft (Fig. 2): crank S works an arm pivoted at its centre T, and the plunger rods D and E attach to the arm's ends U and V.
Materials for this step:
Unknown Metal1 crank, arm
Hex Bolt - Grade 8.81 pivot and rod pins, number not givenTools needed:
Hand Drill
Adjustable SpannerMaterials
8- 1 crank, armPlaceholder
- Placeholder
- 1 piecePlaceholder
- 2 packing boxesPlaceholder
- 4 H, I, J, KPlaceholder
- 1 air tankPlaceholder
- 2 M and NPlaceholder
- 1 pivot and rod pins, number not givenPlaceholder
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