Spring frame for scooter-type trail vehicle

Claim 1

A TRAIL VEHICLE COMPRISING A FORWARD FRAME SECTION HAVING A STEERING POST ATTACHED THERETO FOR SWIVEL MOTION ABOUT A GENERALLY VERTICAL AXIS AT THE FORWARD PART OF SAID FRAME SECTION, A FRONT GROUND WHEEL CARRIED BETWEEN FORK ARMS AT THE LOWER END OF SAID STEERING POST, THE UPPER END OF SAID POST HAVING A STEERING HANDLE FOR CONTROLLING TURNING MOVEMENTS OF SAID STEERING POST, A RIDER''S SEAT MOUNTED ON THE FORWARD FRAME SECTION BELOW AND BEHIND SAID STEERING HANDLE SO THAT A RIDER SEATED THEREON MAY CONVENIENTLY GRASP SAID STEERING HANDLE, A REAR FRAME SECTION SECURED TO SAID FRONT FRAME SECTION FOR RELATIVE SWING MOTION ABOUT THE CENTER OF A HORIZONTAL TRANSVERSE PIVOT PIN LOCATED INTERMEDIATE THE FRONT WHEEL AND A REAR GROUND WHEEL CARRIED BY SAID REAR FRAME SECTION FOR ROTATION IN SUBSTANTIALLY THE SAME LONGITUDINAL VERTICAL PLANE AS SAID FRONT WHEEL, A SPRING SO CONNECTED TO EACH OF SAID FRAME SECTIONS AS TO PRESCRIBE A RELATIVE ANGULAR POSITION OF THE SECTIONS WHEN THE SPRING IS UNFLEXED, SAID SPRING YIELDINGLY RESISTING RELATIVE SWINGING OF THE FRAMES SO THAT, AS SAID VEHICLE RIDES OVER ROUGH TERRAIN, RESULTING SHOCKS TO SAID WHEELS WILL BE PASSED INTO THE SPRING, SAID FRONT AND REAR FRAME SECTIONS HAVING COMPLEMENTING STOP MEMBERS LYING IN THE SAME LONGITUDINAL VERTICAL PLANE, SAID STOP MEMBERS BEING SO DISPOSED THAT AS A RELATIVELY STRONG UPWARD FORCE IS APPLIED TO EITHER WHEEL TO RESPONSIVELY SWING THE RELATED FRAME SECTION, THE STOP MEMBERS OF EACH SECTION WILL BE BROUGHT TO BEAR AGAINST ONE ANOTHER TO A LIMIT OF WING, THE STEERING POST COMPRISING TWO PIECES SEPARATED BY A SHOCK-DAMPENING PAD THE LOWER PORTION OF SAID STEERING POST BEING PIVOTALLY MOUNTED ON AN AXIS RIGID WITH RESPECT TO SAID FRAME SECTION SO THAT SHOCKS TRANSMITTED TO SAID FRAME SECTION THROUGH SAID FRONT WHEEL ARE DAMPENED WITH RESPECT TO THE UPPER STEERING POST PART BY MEANS OF SAID PAD, SAID SPRING BEING A LONGITUDINAL LEAF SPRING POSITIONED ADJACENT SAID PIN AND CAPABLE OF BEING INVERTED SO THAT THE ANGLE DEFINED BETWEEN TWO PLANES ONE OF WHICH CONTAINS THE PIVOT AXIS AND AN AXLE FOR THE REAR WHEEL AND THE OTHER OF WHICH CONTAINS SAID PIVOT AXIS AND AN AXLE FOR THE FRONT WHEEL MAY BE INCREASED OR DECREASED AT WILL.