Not a pump, but a can. Travel Tips

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Not a pump, but a can. Travel Tips

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Every time the whole family is going on vacation, I have the task of checking the condition of our bikes. As a rule, all nodes are in perfect order, with the exception of tires: they require periodic pumping. This is where you sometimes have to sweat, and a lot of time is spent on it.

It was necessary to come up with a device that would replace the pump. I borrowed its main components from ... a home siphon for carbonating water. The principle of operation of the device is very simple. Carbon dioxide gets inside, evaporates there, creating the overpressure that tires need.

General view tire inflation devices shown in the figure. It consists of a body 1, into which a cartridge 2 with carbon dioxide is inserted, a cover 3, on which there is a needle 4 for piercing the stopper of the cartridge. Hose 5 from the bicycle pump is screwed to the body. The tightness of the joints is achieved by rubber gaskets 6 and 7.

The body and lid are machined from steel on a lathe. Two holes are drilled in the cover: with a diameter of 2,5 mm to a depth of 3 mm for the M3 thread - for installing a needle and a diameter of 4,2 mm to a depth of 6 mm for the M5 thread - for installing a hose from a bicycle pump. Two plates 8 and 9 are welded to the body and cover - ribs for ease of twisting.

The needle for piercing a carbon dioxide canister is made from an M3 screw with a length of at least 20 mm. A head is cut off from it, a cut is made with a metal file for the length of a screw 1,5 mm deep (for the passage of carbon dioxide), and then sharpened in the form of a needle. After installing the needle in the lid, locking is done by hitting the construction dowel with a hammer, the tip of which crushes the threads of the needle and the lid (pos. XNUMX, below).

Canister-pump: 1 - body; 2-can; .5 - cover; 4-needle; 5 - bicycle hose; 6,7-gaskets; 8,9 - ribs (for ease of twisting); 10 - bicycle hose fitting (click to enlarge)

A rubber gasket made according to the drawing is glued to the outside of the lid with Moment glue.

The hose also needs to be modified. The part that is screwed to the pump is removed from it. A fitting similar to it is made, but with an M5 metric thread. The hose is connected to the body through a rubber gasket.

Tire inflation works as follows. A can of carbon dioxide is installed in the body, a lid is put on it and slightly screwed on. The bicycle hose is connected to the cover, and then to the nipple of the bicycle tire. By rotating the body and lid, the carbon dioxide can is pierced. This will be indicated by a slight hiss. After emptying the contents of the can, unscrew the bike hose from the tire. If the tire pressure is insufficient for normal driving, it will be necessary to refill it with carbon dioxide. If the pressure is more than necessary, then excess carbon dioxide should be bled from the tire.

This device can be successfully used for pumping balls. It will also come in handy for lovers of water tourism, fishermen and hunters: it instantly pumps up a mattress or a rubber lifebuoy, inflatable pillows, seats. With this device, you can also refill an aerosol can, suitably modified.

Author: S.Semenov

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