| 摘要 |
<p>WRITING BOARD A portable writing board mountable for use on a steering wheel of a vehicle and also entirely stable for writing use when rested upon any flat surface. The board has a platform member which has substantially parallel side edges, a lower edge, and a curved upper edge approximating the curvature of the outer diameter of a vehicle steering wheel. A retaining collar depends from said curved upper edge and is unified thereto. The retaining collar consists essentially of a depending skirt portion and a flange-like portion directed radially inwardly from the bottom edge of said skirt portion to thereby form a recess capable of accommodating the rim of a vehicle steering wheel. Said depending retaining collar is further characterized by the fact that its most depending portions form a bottom surface which extends continuously along the entire curvature of said retaining collar, which bottom surfaces lies in an imaginary plane intersecting said platform at an axis line perpendicular to said side edges of said platform and located at the lowermost bottom edge of said platform, whereby said bottom surface of said retaining collar provides continuous contact for underlying stable support of the entire curved upper edge of said writing board when the same is used on a flat surface.</p> |
