▪ US Patent No. 8,651,445 (SANG-HWA LEE)
발명의 명칭: PORTABLE BOOK HOLDER
1. A portable book holder comprising: a body having long grooves formed along the left and light sides thereof; a screw shaft rotatably mounted inside the body and having a right-handed screw and a left-handed screw formed symmetrically on front and rear outer peripheries thereof; a front nut and a rear nut coupled correspondingly to the front side right-handed screw and the rear side left-handed screw and moved in forward and backward directions of the screw shaft in such a manner as to be distant from or adjacent to each other in accordance with the rotation of the screw shaft; a book holding stand hinge-coupled to the front nut on a front end thereof and having a plurality of left and right supporting members extended and contracted in a telescoping manner in the left and right directions from the inside thereof so as to support an underside of the book and a folding type bottom supporting member disposed on a top surface of the front end thereof so as to support a bottom end of the book; an angle adjusting member hinge-coupled to the rear nut on one end thereof and rotatably coupled to an underside surface of the book holding stand on the other end thereof so as to adjust an angle of the book holding stand through the forward and backward movements of the front nut and the rear nut in accordance with the rotation of the screw shaft; and a cover having long coupling protrusions formed along inner surfaces of left and right sides thereof in such a manner as to be slidingly inserted into the long grooves of the body and coupled to the body to cover the top surface of the book holding stand.
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