Patent ID: 7165642

Claim:
A vehicle chassis comprising: a coupling unit; first and second chassis parts that are coupled detachably to each other through said coupling unit when said first and second chassis parts are moved to a coupling position, and that are aligned in a longitudinal direction; a locking unit including a first engaging part that is pivoted to said first chassis part so as to be rotatable relative to said first and second chassis parts between locking and unlocking positions, that is formed with first and second engaging recesses, and that has a curved guiding face extending between said first and second recesses, a second engaging part mounted on said second chassis part and formed with a tongue such that said tongue pushes said first engaging part to rotate from said unlocking position to said locking position, and slides along said curved guiding face into said first recess during movement of said first and second chassis parts from a decoupling position to said coupling position, and a first urging member for restoring said first engaging part from said locking position to said unlocking position; and a retaining unit including a retaining part that is pivoted to said first chassis part so as to be rotatable relative to said first and second chassis parts between retaining and releasing positions, and that has an engaging end, and a second urging member for restoring said retaining part from said releasing position to said retaining position; wherein said engaging end of said retaining part extends into said second recess in said first engaging part when said retaining part is disposed at said retaining position, thereby retaining said first engaging part at said locking position; and wherein said engaging end of said retaining part is disengaged from said second recess when said retaining part is disposed at said releasing position, thereby permitting rotation of said first engaging part from said locking position to said unlocking position.