Patent ID: 6588775
Filing Date: 2003-07-08
Classification: B62B

Abstract:
A method of locking a dual purpose hand cart convertible between a two wheel, upright hand cart and a four wheel horizontal hand cart and locking the wheel structure for converting the hand cart into a four wheel cart onto the two wheel cart yet permitting the two wheel cart to be normally used,said method comprising providing a two wheel hand cart having spaced, longitudinally extending side rails, providing a second pair of longitudinally extending side rails and normally arranged in a spaced, parallel relationship with the side rails for the two wheel hand cart and pivotably securing the second pair of side rails along the sides of the first mentioned pair, said second pair of side rails including a brace rod extending between said second pair of side rails and movable with the pivotal movements of said second pair of side rails, providing a speed rod mounting locking means for securement to the side rails for the two wheel cart and securing the speed rod and locking means to said side rails to permit the speed rod and locking means to slide in a substantially vertical plane relative to said side rails for locking and unlocking purposes in response to locking and unlocking forces applied thereto and normally residing in a locking position, and imparting a swinging movement to said second pair of side rails causing said brace rod to impact the locking means to cause said locking means to be momentarily slidably moved out of its locking position in response to the impact so the brace rod assumes a locking position and then the locking means automatically moves back to the locking position for locking up the brace rod in place.