Title: Cover with adhesive bridges in scored areas

We claim as our invention:

1. A book cover structure of the type having a backbone with front and back covers connected to the backbone and separated from the backbone by spaced parallel score lines to enable the front and back covers to flex relative to the backbone, the improvement comprising a backbone strip of hot melt adhesive being secured on an inside face area of said backbone and means for positioning sheets in engagement with said backbone comprising a pair of cover strips of hot melt adhesive secured to inside surface areas of the front and back covers in spaced adjacency to the score lines, and bridge means of hot melt adhesive extending between adjacent strips and across said score lines, said bridge means having substantially reduced adhesive thickness at, and over said score lines.

2. The cover of claim 1 wherein said bridge means contacts the cover material substantially throughout its path from the backbone strip to the cover strips.

3. The cover of claim 1 wherein the said bridge means provides a tunnel between the backbone strip to the cover strips.

4. The cover according to claims 2 or 3 wherein the bridge means comprises a plurality of spaced connections extending between the backbone strip to the cover strips.

5. The cover of claim 1 wherein said bridge means comprises gas foamed adhesive connecting said backbone strip to the cover strips.

6. The book cover structure of claim 1 further characterized by the bridge means comprising uniformly spaced ribs spaced apart about 5/64".

7. A book cover structure of the type having a backbone with front and back covers connected to the backbone and separated from the backbone by spaced parallel score lines to enable the front and back covers to flex relative to the backbone, the improvement comprising a backbone adhesive strip of hot melt adhesive being secured on an inside face area of said backbone and means for positioning sheets in engagement with said backbone comprising a pair of cover adhesive strips of hot melt adhesive secured to inside surface areas of the front and back covers in spaced adjacency to the score lines, and bridge means of substantially reduced adhesive width and thickness extending across the score lines from the cover adhesive strips to the backbone adhesive strip, the cover strips of hot melt adhesive having a thickness in the range of 0.030" to 0.008", the bridge means including a series of generally transversely extending bridges spaced apart about 5/64" and with each cover strip having a transverse width of about 3/64".

8. A book cover structure of the type having a backbone with front and back covers connected to the backbone and separated from the backbone by spaced parallel score lines to enable the front and back covers to flex relative to the backbone, the improvement comprising a backbone adhesive strip of hot melt adhesive being secured on an inside face area of said backbone and means for positioning sheets in engagement with said backbone comprising a pair of cover adhesive strips of hot melt adhesive secured to inside surface areas of the front and back covers in spaced adjacency to the score lines, and bridge means of substantially reduced adhesive width and thickness extending across the score lines from the cover adhesive strips to the backbone adhesive strips.

9. The book cover structure of claim 8 further characterized by the cover strips of hot melt adhesive having a thickness in the range of 0.030" to 0.008".

10. The book cover structure of claim 9 further characterized by the backbone strip of adhesive having a thickness on the order of 0.030".

11. The book cover structure of claim 8 further characterized by said bridge means comprising a series of generally transversely extending ribs of a few thousandths of an inch width spaced apart about 5/64" and with each cover strip having a transverse width of about 3/64".

12. The book cover structure of claim 8 further characterized by a series of sheets being mounted in edgewise relationship upon said backbone strip of hot melt adhesive inwardly of and between said score lines and with said backbone strip to form a book, the bridge means comprising a series of adhesive ribs extending transversely over the score lines, said pair of cover strips of hot melt adhesive and said ribs all being heated to produce a bond joining lower edges of the sheets with the cover structure.

13. The book cover structure of claim 12 further characterized by said bridge means between the strips of hot melt adhesive being bonded with opposed surface areas of outside ones of said sheets at the areas of said score lines thus providing further securement for the sheets secured to said backbone.

14. A book cover structure of the type having a backbone with front and back covers connected to the backbone and separated from the backbone by spaced parallel score lines to enable the front and back covers to be bent relative to the backbone, the improvement comprising a backbone strip of holt melt adhesive being secured on an inside face area of said backbone, and means for positioning sheets in engagement with said backbone comprising a pair of cover strips of hot melt adhesive secured to inside surface areas of the front and back covers in spaced adjacency to the score lines with bridge portions of said cover strips extending across the score lines between backbone strip and the cover strips, thus providing adhesive over and on opposite sides of, the associated score line, the bridge portions being of substantially reduced adhesive width and thickness where extending across the score lines from the cover adhesive strips to the backbone adhesive strip, the bridge portions when heated and melted producing a bonded area at the associated score line, adhering the adjacent sheet to said backbone and leaving the cover freely flexible along the score line where the cover is joined with the backbone.


Other info:


Inventors: Wang, James C. (Libertyville, IL)
Murfitt, Donald (Glenview, IL)
Livingston, Paul H. (Hoffman Estates, IL)

Application Number: 06/162608
Filing Date: 1980-06-24
Publication_date: 1983-02-01
Assignee: GEN BINDING CORP

Primary Class(es): 281/21.100 281/29, 412/37
Other Classes: B42D3/00; B42C9/00; B42D3/00
US Patent Ref:

3847718	November, 1974	Watson	281/21R	ADHESIVE BINDING MEANS FOR EDGE BINDING ASSEMBLED PAGES TOGETHER IN BOOK FASHION
3957287	May, 1976	Hall	281/29	Book and cover therefor
3964770	June, 1976	Abildgaard	281/29	Case for book with pressure sensitive resilient spine pad
3973787	August, 1976	Staats	281/21R	Bookbinding system
4129471	December, 1978	Rome	281/21R	Bookbinding technique
4141100	February, 1979	Domroe	281/21R	Binding machine and cover for use therewith
4289330	September, 1981	Wiermanski	11/1AD	Bookbinding system

Other Refs:
Primary Examiner: Bell, Paul A.
Assistant Examiner: Brown, John S.
Attorney: Hill, Van Santen, Steadman, Chiara & Simpson