1. Field of the Invention
The present invention relates to a rotation angle-adjustable rotating device, more particularly to a rotation angle-adjustable rotating device for use in an electrical appliance.
2. Description of the Related Art
A conventional rotating device is shown to be employed in an electrically operated fan, and includes coaxially disposed first and second gears 12, 13, a third gear 14 formed with a coupler shaft 15, a connecting plate 16, and a swing arm 17. The first gear 12 is driven by a threaded portion 111 of a drive shaft 11 of the fan, while the second gear 13 is meshed with the third gear 14. One end of the connecting plate 16 is securely mounted on the coupler shaft 15 for co-rotation therewith, and the other end thereof is pivoted to a first end of the swing arm 17. A pushing element 171 is fixed on a second end of the swing arm 17, and extends into an elongated slot 181 formed in a fan housing 18 of the fan in such a manner that rotation of the drive shaft 11 results in synchronous rotation of the coupler shaft 15, which, in turn, results in a back-and-forth swing action of the swing arm 17, thereby driving the fan housing 18 to swing through the pushing element 171.
One disadvantage of the conventional rotating device resides in that the rotation angle of the fan housing 18 is unadjustable, thereby inconveniencing the user when he or she desires a larger swinging angle of the fan.