ROTATIONAL ACTUATOR

WIPO Patent Application WO/2011/141183

A3

A perfected rotational actuator, comprising, in two box-shaped shells (31, 32), a pair of plates (12, 13) connected to each other by a central pin (14) and containing, between the same, a plurality of pulleys (25), with two superimposed perimetric slots (29), in which a shape memory alloy wire (21) circulates, wherein two segments of said wire (21) are arranged in aligned slots (29) of the pulleys (25) and are constrained at opposite ends to non-conductive elements (19) integral with a tooth (16) protruding radially from a plate (12) and in a position shifted by a certain angle (θ) with respect to each other, the two segments of wire being defined by passage through a further non-conductive element (20) integral with a tooth (17) radially protruding from the second plate (13), a torque spring (23) situated on the central pin (14) being interposed between the plates (12, 13), the opposite ends of the wire (21) being connected to an electric wire (22), radial arms (34, 35) of each of the shells (31, 32) being connected to elements to which the rotation movement is to be transmitted.

PITTACCIO SIMONE (IT)
VISCUSO STEFANO (IT)
BESSEGHINI STEFANO (IT)

PCT/EP2011/002385

April 05, 2012

May 10, 2011

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CONSIGLIO NAZIONALE RICERCHE (IT)
PITTACCIO SIMONE (IT)
VISCUSO STEFANO (IT)
BESSEGHINI STEFANO (IT)

F03G7/06; A61H1/00; H01H61/01

US4965545A	1990-10-23
DE29804490U1	1998-06-25
US5396769A	1995-03-14
US4472939A	1984-09-25
US4092874A	1978-06-06

MARTEGANI, Franco (Monza, IT)

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