Book holder assembly

1. A book holder assembly for holding an open book mounted therein at a desired book reading slope, comprising:

a pair of spaced-apart book holder planar book support elements each having opposed longitudinal side edges and opposed transverse bottom and top edges;

a book holder book spine support element having longitudinal edges and joined at each said longitudinal edge by a hinge to a respective longitudinal side edge of one of said pair of spaced-apart book holder planar book support elements;

a pair of spaced apart book holder angularity support elements each having longitudinal side edges and transverse bottom and top edges and each joined at its said transverse top edge by a hinge to a respective top edge of one of said pair of spaced-apart book holder planar book support elements;

an eyelet positioned near each bottom edge of each of said pair of spaced-apart book holder planar book support elements and of each of said pair of spaced apart book holder angularity support elements; and

a flexible cord threaded through said eyelets and provided with a co-operating adjustably positioned clamp to form a cord closed loop of desired effective diameter that limits the slope of said pair of book holder planar book support elements to the desired book reading slope.

2. The book holder assembly invention of claim 1 , and wherein said flexible cord has sufficient extra length beyond said closed loop whereby said flexible cord extra length may also be looped over the book holder assembly to function as a book mark.

3. The invention defined by claim 1 , and wherein each of said pair of book holder planar book support elements is provided with multiple accessory insert through-pockets positioned on and attached to its reverse side, said accessory insert through pockets of each book holder planar book support element abutting each other and extending between said longitudinal edges of the book holder planar book support element.

4. The invention defined by claim 3 , and further comprised of a pair of accessory insert page holder elements, each said accessory insert page holder insert element slidably co-operating with one of said multiple abutting accessory insert through-pockets in a respective one of said pair of book holder planar book support elements.

5. The invention defined by claim 4 , and wherein each of said accessory insert page holder elements is provided with a curved page contact element, said curved page contact element being mounted on said accessory insert page holder element with a spring that urges said curved page contact element to yieldably press against said book holder planar book support element.

6. The invention defined by claim 5 , and wherein each of said book holder accessory insert page holder elements is offset longitudinally with respect to the other along said book holder book support longitudinal edges.

7. The invention defined by claim 1 and further comprised of a pair of spaced-apart book support ledges, each of said book support ledges being integrally formed with the bottom edge of a respective book holder assembly planar book support element.

8. The invention defined by claim 7 wherein said eyelet positioned near each bottom edge of each of said pair of spaced-apart book holder planar book support elements is positioned in each of said book support ledges.

9. The invention defined by claim 1 where in said eyelet positioned near each bottom edge of each of said pair of spaced-apart book holder planar book support elements is positioned in said book holder spine support element.

10. The book holder assembly invention of claim 3 , wherein one accessory insert through-pocket on one of said pair of book holder planar book support elements is aligned longitudinally with another accessory insert through-pocket on the other of said pair of planar book holder support elements and an accessory insert element projects through said one and another accessory insert through-pockets to thereby retain said pair of book holder book planar book support elements in an open position.

11. A book holder assembly for holding an open book mounted therein at a desired book reading slope, comprising:

a pair of spaced-apart book holder planar book support elements each having opposed longitudinal side edges and opposed transverse bottom and top edges;

a book holder book spine support element having longitudinal edges and joined at each said longitudinal edge by a hinge to a respective longitudinal side edge of one of said pair of spaced-apart book holder planar book support elements;

a book holder angularity support element having longitudinal side edges and transverse bottom and top edges and joined at its said transverse top edge by a hinge to a respective top edge of one of said pair of spaced-apart book holder planar book support elements;

an eyelet positioned near a bottom edge of one of said pair of spaced-apart book holder planar book support elements and said book holder angularity support element; and

a flexible cord threaded through said eyelets and provided with a co-operating adjustably positioned clamp to form a cord closed loop of desired effective diameter that limits the slope of said pair of book holder planar book support elements to the desired book reading slope.

12. The book holder assembly invention of claim 11 , and wherein said flexible cord has sufficient extra length beyond said closed loop whereby said flexible cord extra length may also be looped over the book holder assembly to function as a book mark.

13. The invention defined by claim 11 , and wherein each of said pair of book holder planar book support elements is provided with multiple accessory insert through-pockets positioned on and attached to its reverse side, said accessory insert through pockets of each book holder planar book support element abutting each other and extending between said longitudinal edges of the book holder planar book support element.

14. The invention defined by claim 13 , and further comprised of a pair of accessory insert page holder elements, each said accessory insert page holder insert element slidably co-operating with one of said multiple abutting accessory insert through-pockets in a respective one of said pair of book holder planar book support elements.

15. The invention defined by claim 14 , and wherein each of said accessory insert page holder elements is provided with a curved page contact element, said curved page contact element being mounted on said accessory insert page holder element with a spring that urges said curved page contact element to yieldably press against said book holder planar book support element.

16. The invention defined by claim 15 , and wherein each of said book holder accessory insert page holder elements is offset longitudinally with respect to the other along said book holder book support longitudinal edges.

17. The invention defined by claim 11 and further comprised of a pair of spaced-apart book support ledges, each of said book support ledges being integrally formed with the bottom edge of a respective book holder assembly planar book support element.

18. The invention defined by claim 17 wherein said eyelet positioned near a bottom edge of one of said pair of spaced-apart book holder planar book support elements is positioned in said book support ledge.

19. The invention defined by claim 11 where in said eyelet positioned near a bottom edge of one of said pair of spaced-apart book holder planar book support elements is positioned in said book holder spine support element.

20. The book holder assembly invention of claim 13 , wherein one accessory insert through-pocket on one of said pair of book holder planar book support elements is aligned longitudinally with another accessory insert through-pocket on the other of said pair of planar book holder support elements and an accessory insert element projects through said one and another accessory insert through-pockets to thereby retain said pair of book holder book planar book support elements in an open position.