Patent ID: 7603747

Claim:
A rotating shaft structure with automatic locking mechanism comprising: a) an axial member having a shaft and a linking portion, the shaft has a connecting segment located on a free end thereof; b) a main frame having a frame plane and a connecting portion, the frame plane has a core hole; c) a friction disc; d) a connecting part connected to the frame plane; e) a cam member having a fastening part and a sliding part; f) at least one elastic body; and g) an end closure connected to the connecting segment of the shaft connected with a end enclosure and forming axial pressure to constrain the main frame, the friction disc, the connecting part, the cam member, and the at least one elastic body, wherein the shaft is sequentially inserted through the core hole of the upright frame plane of the main frame, the friction disc, the connecting part, the fastening part, the sliding part, the at least one elastic body, and the end closure; wherein outer and inner edges of adjacent surfaces of the fastening part and the sliding part are respectively provided with at least one wedge block and at least one wedge slot alternately so as to connect the fastening part and the sliding part together; wherein, when the axial member rotates in a first direction, the inclined plane of the wedge slot of the sliding part moves upward along the inclined plane of the wedge block and thus axially presses the elastic body thereby prompting the contact plane of the sliding part to rotate along the wedge blocks of the fastening part; wherein, when the axial member rotates in a second direction being opposite to the first direction, the at least one wedge slot of the sliding part moves to the at least one wedge block of the fastening part and, the elastic body pressing the at least one wedge slot to engage the at least one wedge block forming an automatic locking of butting joint.