Patent ID: 6135889
Filing Date: 2000-10-24
Classification: B06B,Y10T

Abstract:
A blade actuator comprising a shaft being rotatable about a shaft axis of said shaft with a combined simple rotation and an alternating rotation of limited extent, and a blade connected to said shaft so that said blade is also rotatable substantially about said shaft axis with said combined simple rotation and said alternating rotation of limited extent, said blade actuator further comprising:two supporting plates coupled directly with said shaft so as to rotate together with said shaft about said shaft axis;a vibration generator coupled to said shaft and subjecting said shaft to said alternating rotation of limited extent about said shaft axis;a gear mounted between said two supporting plates such that said plates are positioned at respective opposite faces of said gear, said gear being freely rotatable with respect to the shaft and with respect to said two supporting plates about said shaft axis;a rotation actuation device associated with said gear for rotating said gear about said shaft axis;two pairs of first slotted holes, one respective pair of said two pairs of said first slotted holes being formed in a respective one of said plates and said two pairs of said first slotted holes being mutually diametrically opposite with respect to the shaft, and said two pairs being positioned mutually facing in a direction parallel to the direction of said shaft axis;a pair of second slotted holes formed in said gear such that said two pairs of mutually facing first slotted holes are arranged in a position corresponding to that of the second slotted holes;two pairs of shaped elements, each pair of said two pairs of shaped elements comprising two shaped elements which are mutually oppositely arranged in contact with respective mutually opposite end profile surfaces of one of said pair of said slotted holes and of respective mutually facing first slotted holes of said two supporting plates; andelastic elements which are coupled between respective facing surfaces of each of said two pairs of shaped elements.