Frame for two-wheeled cycle vehicle

Claim 1

A TWO-WHEELED PEDAL CYCLE VEHICLE COMPRISING FRONT AND REAR RUBBER TYRED WHEELS EACH WHEEL BEING OF AN OVERALL DIAMETER OF BETWEEN 14 AND 18 INCHES, A FRAME FORMED BY (A) A TUBULAR MAIN FRAME BACKBONE BEING A FLAT SIDED OVAL IN CROSS-SECTION AND EXTENDING LONGITUDINALLY OF THE VEHICLE DOWNWARDLY INCLINED REARWARDLY THEREOF, (B) A FRONT TUBE UPSTANDING FROM THE FRONT END OF THE BACKBONE AND HOUSING A STEERING COLUMN WHICH IS SURMOUNTED BY HANDLEBARS, (C) A SEAT TUBE UPSTANDING FROM THE BACKBONE REARWARDLY SPACED FROM THE FRONT TUBE AND SURMOUNTED BY A SADDLE, (D) A TUBULAR HOUSING FOR A PEDAL CRANK AXLE EXTENDIN TRANSVERSELY OF AND ADHERRED TO THE UNDERSIDE OF THE BACKBONE AT A POINT IMMEDIATELY BELOW THE JUNCTION OF THE SEAT TUBE AND BACKBONE, (E) A SUBSTANTIALLY STRAIGHT LONGITUDINAL BRACING MEMBER EXTENDIN FROM A POINT ON THE UPPER SIDE OF THE BACKBONE AHEAD OF THE SEAT TUBE AT A DISTANCE EQUAL TO AT LEAST ONE THIRD OF THE DISTANCE SEPARATING THE SEAT FROM THE FRONT TUBE REARWARDLY TO ADJOIN THE SEAT TUBE AT A POSITION BELOW THE MIDPOINT THEREOF, (F) SAID BACKBONE FORMIN THE SOLE FRAME MEMBER CONNECTING THE FRONT TUBE WITH THE REMAINDER OF THE FRAME AND BEING FORMED OF TWO INTERENGAGING FRONT AND REAR SECTIONS WHICH ARE SEPARABLE ONE FROM THE OTHER AT A POINT AHEAD OF THE JUNCTION OF THE LONGITUDINAL BRACING MEMBER WITH THE BACKBONE AND SAID REAR BACKBONE SECTION BEING PROVIDED AT ITS FRONT END WITH FORWARDLY PROJECTIN SLEEVE MEANS WHICH ARE INSERTABLE INTO THE OPEN HOLLOW REAR END OF THE FRONT SECTION.