Object that rotates in a flow of air, suitable for recreational use

Abstract

An object intended to rotate in a flow of air (F), comprising a plate ( 2 ) with a general planar aspect and globally extending along a plane, the plate ( 2 ) comprising: a rear face ( 4 ) having a central area ( 16 ) on which an operator ( 6 ) is intended to exert a pressure force (F 1 ) either directly or via a support; a front face ( 8 ) intended to receive the flow of air; a peripheral portion ( 10 ); and a main portion ( 14 ) extending between the peripheral portion; the plate having a stable shape at rest, the plate having a shape in use such that: the pressure force balances a resulting force (F 2 ) exerted by the flow of air on the plate, so that the central area remains in contact with the operator or the support, and the flow of air exerts a torque on the plate causing rotation of the plate around an axis substantially perpendicular to the plane.

1 . An object ( 1 ;  101 ;  201 ) intended to rotate in a flow of air (F), notably for recreational use, comprising a plate ( 2 ) with a general planar aspect, globally extending along a plane (P) the plate ( 2 ) having a center of inertia (I) and comprising:
 a rear face ( 4 ) including a central area ( 16 ) located in the vicinity of the center of inertia (I), on which an operator ( 6 ) is intended to exert a pressure force (F 1 ), either directly or via a support, during periods of use of the object ( 1 ;  101 ;  201 );   a front face ( 8 ) intended to receive the flow of air (F) substantially along an axis (Iz) passing through the center of inertia (I) and perpendicular to the plane (P);   a peripheral portion ( 10 ,  210 ) encompassing an edge ( 12 ) of the plate ( 2 ); and   a main portion ( 14 ) extending between the peripheral portion and including the central area ( 16 );   
       the plate ( 2 ) having a stable shape at rest, preferably able to be piled up, and having this shape after each of the periods of use, 
       the plate ( 2 ) having, during any of the periods of use, a shape in use such that:
 the pressure force (F 1 ) exerted by the operator balances a resulting force (F 2 ) exerted by the flow of air (F) on the plate ( 2 ), so that the central area ( 16 ) remains in contact with the operator ( 6 ) or the support, and 
 the flow of air (F) exerts a torque on the plate ( 2 ) causing rotation of the plate ( 2 ) substantially around the axis (Iz). 
 
     
     
         2 . The object ( 1 ;  101 ;  201 ) according to  claim 1 , characterized in that the plate ( 2 ), on at least 90% of the surface area of the rear face ( 4 ), has a thickness (e) comprised between 5 and 500 μm, preferably between 10 and 200 μm, and a basis weight comprised between 10 and 200 g/m 2 , preferably between 20 and 100 g/m 2 . 
     
     
         3 . The object ( 1 ;  101 ;  201 ) according to  claim 1 , characterized in that the peripheral portion ( 10 ,  210 ) of the plate comprises one or several areas ( 18 ,  20 ,  22 ,  24 ,  26 ,  28 ,  30 ,  32 ) which cannot be developed. 
     
     
         4 . The object ( 1 ;  101 ;  201 ) according to  claim 1 , characterized in that the peripheral portions ( 10 ,  210 ) comprises at least one area forming with the plane (P), at rest, an average angle (α, β) greater than or equal to 10°, preferably greater than or equal to 30°. 
     
     
         5 . The object ( 201 ) according to  claim 1 , characterized in that the plate ( 2 ) comprises, at rest, at least one convex area ( 14 - 211 ) for which the convexity is oriented from the front face ( 8 ) towards the rear face ( 4 ), and at least one other convex area ( 210 ) for which the convexity is turned from the rear face ( 4 ) to the front face ( 8 ), so that the plate ( 2 ) may be reversibly used by the operator ( 6 ). 
     
     
         6 . The object ( 1 ;  101 ;  201 ) according to  claim 1 , characterized in that the plate ( 2 ), for passing from the position at rest to the position in use, undergoes flexure along a weakness axis (Dl, D 2 ). 
     
     
         7 . The object ( 1 ;  101 ;  201 ) according to  claim 1 , characterized in that the shape at rest of the plate ( 2 ) is such that, if the plate ( 2 ) retained the shape at rest during the period of use, the flow of air (F) would be incapable of causing rotation of the plate ( 2 ) substantially around the axis (Iz). 
     
     
         8 . The object ( 1 ;  101 ;  201 ) according to  claim 1 , characterized in that the plate ( 2 ), in an orthogonal projection on the plane (P), substantially has a general shape taken from the following shapes: triangular ( 501 ) rectangular ( 302 ), parallelogram ( 401 ,  402 ,  403 ,  404 ,  405 ), trapezoidal ( 601 ), four-sided and convex ( 601 ,  302 ,  402 ), four-sided and concave ( 305 ,  602 ) with the center of inertia (I) being located inside the quadrilateral, convex polygonal ( 701 ), star-shaped polygonal ( 801 ) with the center of inertia (I) being located inside the star-shaped polygon. 
     
     
         9 . The object ( 1 ;  101 ;  201 ) according to  claim 1 , characterized in that the plate ( 2 ), in an orthogonal projection on the plane (P), has a polygonal shape including sides with a substantially rectilinear, concave, convex, S or toothed shape. 
     
     
         10 . The object ( 1 ;  101 ;  201 ) according to  claim 1 , characterized in that the plate ( 2 ) is in plastic polymer, in bio-plastic polymer, in a laminated material comprising a plastic polymer or a bio-plastic polymer, or in tissue paper.