A Mechanical Bicycle Horn
The body of the horn A is made of metal, about 3 in. in diameter, with a screw cover. The shaft B, to which is attached a driving pulley, C, and a ratchet wheel, D, is fitted in holes drilled through the diameter of the body. The diaphragm E is clamped, between the edge of the body and the cover, on a seat made of rubber rings, F, and carries a contact device, G, that is riveted to its center. The diaphragm should be set so that the contact will touch the ends of the ratchets.
The Horn is Sounded by Making Connections with the Moving Surface of the Tire
A metal cone is fastened in an opening cut in the center of the cover, over the diaphragm. The back of the body is fitted with a bracket for attaching it to the front fork on a bicycle. The lever H carries an idler pulley which is forced against the bicycle tire and the pulley C by means of a cord, J.
Adjusting the diaphragm contact on the ratchet wheel will change the tone of the horn.—Contributed by P. Mertz, Jamaica, L. I.