Bicycle frame

Claim 1

A children's bicycle frame composed essentially of only five tubes comprising an elongated relatively large diameter crossbar having walls, a front and a rear, the front of said crossbar being flattened to a vertical front end having a width that is twice the wall thickness of said crossbar, the rear end of said crossbar having upper and lower walls which are turned toward each other and shaped to form an inwardly curved horizontal rear end; a tubular headpost aligned with and abutting said crossbar front end; first weld means connecting said headpost and crossbar front end around said front end; a generally U-shaped tubular rear fork having rear ends and a rounded bridge end that has a smaller diameter than that of the crossbar and engaged from above and below by said crossbar rear end upper and lower walls and following the curve of those walls so that the plane of said rear fork is perpendicular to said headpost; second weld means connecting said rear end upper and lower walls of said crossbar to said rear fork bridge end; means defining registering openings in the top and bottom walls of said crossbar forward of the rear end of said crossbar; a tubular seat post having upper and lower ends and snugly received in said crossbar openings so that the lower end of said seat post extends appreciably below said crossbar; third weld means connecting said seat post to said crossbar around said crossbar openings; a short pedal crank tube positioned crosswise against the lower end of said seat post; and fourth weld means connecting said pedal tube and the lower end of said seat post.