Instructables
My wife loves her pink bicycle, but when her bell stopped working after one to many over emphatic "bring-brings," she was anything but happy. To be more clear, the internal mechanism that caused the actuator to return after it was pressed broke. So to use the bell, she had to manually move it forward and back.

Eventually, I decided to open the bell to see how it works and hopefully fix it. While my solution may not work for the entire life of the bell, it is very simple and should provide plenty more "bring-brings" until I have to work on it again.

Step 2: Opening the Bell

These common bells are topped with a metal bowl. It can be easily removed by twisting it counterclockwise. With the top off, the inner parts of the bell are revealed. The broken part should be seen right away...

Step 3: Internal Mechanisms

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Once the top is off, the small nut can be removed. A pair of pliers may be needed for this. Under this nut is a plastic piece loosely holding two washers. When the bell actuator is depressed, these washers rapidly revolve around the center of the bell. The "bring-bring" sounds are created by the washers hitting the inner sides of the bell top.

There is a step up gear ratio in use here. As the actuator moves, it turns a gear with few teeth multiple times. In turn, this gear turns the removed piece holding the washers. Thus, a little movement of the actuator causes a lot of movement with the washer piece.

The actuator should be pulled back to its starting position automatically. This is done by a pair of plastic arms connected to the actuator and a small ring placed in the center of the bell. After a lot of use, these plastic arms eventually broke away from the actuator, causing the "spring" action to no longer work. 

I don't know of anyway to fix this piece that will not break again soon after.
 
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Ev1 year ago
Use some car wax on chrome to clean the rust and prevent more!
Kurt E. Clothier (author)  Ev1 year ago
Thanks for the tip. I cleaned most of it with CLR before I took the pictures, but the wax would be a good top coat.