Patent ID: 7341390

Claim:
A loose-leaf binder comprising: a) a back having: i) two ends; ii) a spine having a top surface, a bottom surface, two edges and two through holes defined near the ends of the back; iii) two skirts defined respectively on the bottom surface respectively at the edges of the spine; iv) two tracks defined between the two skirts on the bottom surface of the spine, wherein two longitudinal lips are defined respectively on the tracks and parallel to the spine; v) two side slots defined respectively between the corresponding side skirts and tracks; and vi) a middle slot defined longitudinally between the tracks; b) a binder made of a flexible material, attached to the back, and having multiple open rings being detachably attached to the back and defined in a curved shape with at least one angle, each open ring of the multiple open rings having: i) two ends; ii) two inclined sections being defined adjacent respectively to two level sections of the open rings; and iii) the two level sections are defined respectively on the ends of the open rings, are parallel to the inclined sections and hooking on one of the inclined sections; and c) two end plugs mounted respectively in the ends of the back, each of the two end plugs having: i) a plug cover attached to one of the ends of the back; ii) a middle tine extending from the plug cover and having: (1) a top; (2) a distal end; (3) a proximal end formed integrally with the plug cover; (4) a middle inclined compression surface is defined on the top of the middle tine at the proximal end; and (5) a latch defined at the distal end and having an inclined release surface sloping down toward the corresponding plug cover; and iii) two side tines extending from the plug cover on opposite sides of the middle tine, each of the two side tines having: (1) a top; (2) a bottom; (3) a distal end; (4) a proximal end formed integrally with the plug cover; (5) a side inclined compression surface defined on the top of the side tine at the proximal end; and (6) a sloped groove defined longitudinally in the bottom of the side tine between the distal end, proximal end of the side tine and facing the middle tine and pressing the inclined section of at least one of the open rings on the binder.