Dual Linkage Front Fork with Steering Lock for Scooter

Abstract

A vehicle includes a dual linkage assembly coupled to two front wheels and a fork. The dual linkage assembly includes arms coupled at pivot points. Each arm rotates independently at the pivot points and responds to force applied by the rider, such that both front wheels maintain contact with the ground. The vehicle further includes a lock assembly including a lever and a lock block coupled to the front fork, a first piece with a first notch coupled to one or more of the arms, and a second piece with a second notch coupled to a head tube. When locked, the lock block engages the first notch, preventing the dual linkage assembly from rotating, and engages the second notch, preventing the fork from rotating. The vehicle is then capable of standing upright without assistance from a rider or stand.

What is claimed is: 
     
         1 . A vehicle comprising at least three wheels, comprising;
 a first front wheel;   a second front wheel;   a front fork; and   a dual linkage assembly, comprising:
 a first upper arm and a second upper arm; 
 a first lower arm and a second lower arm; 
 a first upright and a second upright; 
 a first end of the first upright coupled to the first front wheel; 
 a second end of the first upright coupled to a first end of the first upper arm at a first upper outer pivot point; 
 the second end of the first upright coupled to a first end of the first lower arm at a first lower outer pivot point; 
 a first end of the second upright coupled to the second front wheel; 
 a second end of the second upright coupled to a first end of the second upper arm at a second upper outer pivot point; 
 the second end of the second upright coupled to a first end of the second lower arm at a second lower outer pivot point; 
 a second end of the first upper arm coupled to a second end of the second upper arm and the front fork at an upper center point; 
 a second end of the first lower arm coupled to a second end of the second lower arm and the front fork at a lower center point, 
 wherein the first upper arm, the second upper arm, the first lower arm, and the second lower arm each rotate independently at the corresponding first upper outer pivot point, the second upper outer pivot point, the first lower outer pivot point, and the second lower outer pivot point. 
   
     
     
         2 . The vehicle of  claim 1 , further comprising:
 a first upper coupling mechanism coupling the first end of the first upper arm and the second end of the first upright at the first upper outer pivot point;   a first lower coupling mechanism coupling the first end of the first lower arm and the second end of the first upright at the first lower outer pivot point and at a first position closer to the first front wheel than the first upper arm;   a second upper coupling mechanism coupling the first end of the second upper arm and the second end of the second upright at the second upper outer pivot point;   a second lower coupling mechanism coupling the first end of the second lower arm and the second end of the second upright at the second lower output pivot point and at a second position closer to the second front wheel than the second upper arm;   an upper center coupling mechanism coupling the second end of the first upper arm and the second end of the second upper arm at the upper center point; and   a lower center coupling mechanism coupling the second end of the first lower arm and the second end of the second lower arm at the lower center point.   
     
     
         3 . The vehicle of  claim 2 , wherein the upper center coupling mechanism and the lower center coupling mechanism directly couples the dual linkage assembly to the front fork.