A hinged connection device (1) is suitable for connecting a power supply device and an electric device (5),Having a movable head (2) rotating relative to the base (4),The head (2) has a head body (21), the head body (21) has a spherical cap shaped convex part (23), and a connector (3). The connector (3) has a first end (32) leading out the connecting part, and a second end (33) leading out the convex part, The second end (33) has a protruding handle (35), and the base (4) has a peripheral bracket (41),The peripheral contact surface (413) has a shape complementary to the convex part, the peripheral contact surface receives the convex part to establish a patellar connection between the head and the base, and the central support (42) has a central contact surface (421) in contact with the handle.Figure 7
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