Bicycle handlebar adjustment assembly

Claim 1

For use with a bicycle having a frame incorporating a vertically presented head tube, a stem, and handlebars engaged to said stem, a handlebar height adjustment assembly comprising a vertically presented stem tube engaged in the upper portion thereof to said stem and projecting downwardly therefrom into said head tube and being of relatively reduced diameter and coaxially with respect thereto for axially reciprocal shiftable movement relative to said head tube, said stem having a passage communcating with the interior of said stem tube, a control rod extending downwardly through said stem passage into said stem tube, a fork tube fixed within said head tube in coaxial and surrounding relationship to said stem tube, said fork tube being of multi-splined configuration, a sliding head disposed inwardly of said head tube, said sliding head being rigid on the lower end portion of said stem tube and being contoured complementarily to the fork tube spline configuration for being matingly engageable therewith whereby relative rotative movement between said fork tube and said stem tube is inhibited, a cross pin carried on said control rod in its lower end portion, a latch arm having its longitudnal axis perpendicular to the axis of said cross pin carried on said pin by means of an opening in said arm through which the said pin extends, said latch arm extending transversely of said stem tube, and means for selectively engaging said latch arm through operation of said control rod with said fork tube for presenting and maintaining said handlebars in predetermined vertical relationship with respect to said head tube.