Connection device for connecting box to bicycle handlebar

A connection device comprising:

• a fixing board connected to a rear end of a box and including an insertion extending from a lower end thereof and two apertures defined in two sides of a top of the fixing board, a slot defined through the fixing board;
• a main part including a front board, a back board and a locking unit, the front board including a groove defined in a lower end of a side facing the fixing board and two protrusions extending from a top thereof, the insertion of the fixing board engaged with the groove of the front board, the two protrusions engaged with the apertures of the fixing board, a passage defined through the front board, the locking unit including a locking member, a spring, a button and a safety member, the locking member including a tongue extending from an end thereof and two inclined surfaces defined on two sides of the locking member, two positioning members extending from two sides of the other end of the locking member, the tongue extending through the passage of the front board and the spring having one end connected to the locking member and the other end of the spring connected to the back board, two push rods extending from a lower end of the button and each push rod including an inclined side, the two push rods being slidably connected with the inclined surfaces of the locking member, two concavities defined on two sides of the button, two engaging portions extending from a side of the safety member and engaged with the two concavities of the button, a spring plate having one end fixed on the safety member and the other end of the spring plate extending beyond the other side of the safety member, the spring plate contacting against the button, two stops and a trigger portion extending from the safety member, the safety member being pushed by the spring plate and the two stops being rested on the back board so that the safety member cannot move downward, and
• a clamping unit for clamping the main part to a handlebar.