Abstract: Windmill (10) having a plurality of hydrodynamic, folding blades (12, 14, 16 and 18) secured to a hub (64). The blades are propelled by wind current such that the windmill rotates about a central axis of a shaft (20) on which a hub (64) is journalled. Each folding blade extends radially from the hub and includes a lower blade portion (24) attached to the hub and an upper blade portion (22) pivotally attached to the lower blade portion. The lower blade portion includes a hydrodynamic surface extending from a first edge(43) and terminating at a trailing edge (42). The upper blade portion is hydrodynamically contoured so as to form a nose cone (44). An apex of the nose cone forms a leading edge (40) of the upper blade portion that is opposite a trailing edge (41).

Abstract: A detachable headrest (10) for removable installation on a seat back (12) includes a frame (16) having a base member (18) for contacting the seat back and a collapsible, resilient upper member (20) projecting upwardly from the base member above the seat back. A cushion (22) is mounted on and supported by the upper member of the frame. Channel brackets (25) are secured to the underside of the base member and grip the top of the seat back. A flap (46) of fabric extends downwardly from the anterior face of the cushion and covers a portion the seat back so that a person leaning against the flap secures the detachable headrest in position.