Clarence E Whitaker, of Lynn, Massachusetts April 17th 1894 wrote;
The connection is made by interlocking tooth formations, and with this construction the fulcrum point varies with the rocking of the two sections and thereby permits more extended movement of the sections. This is more especially advantageous whereby the wheel collides with an obstacle of sufficient fixed character to suddenly stop the machine. The two sections are connected by a spring. Said springs are well stiffened and it will be understood that the rocking movements of the sections, as they take place under the weight of the rider, are opposed by the tensional strain of the springs.
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