Patent GB-718235-A (GB)
Title: Loose-leaf binding device
IPC: B42B5/10
Filed: 1952-10-21
Abstract: 718,235. Loose-leaf binding: bookbinding. BERBERICH, W. Oct. 21, 1952 [Oct. 22, 1951; May 9, 1952], No. 26401/52. Classes 16 and 146(1) A binding device, for loose leaves having slits along one longitudinal edge, comprises rings 2 integral at one end with, and perpendicular to one side of, a connecting bar 1 of V-shaped cross-section made of flattened springing material, the other side 1<SP>1</SP> of the bar having recesses 4 corresponding to the rings 2, into which the free ends of the rings 2, provided with notches 3, are adapted to be latched, the recesses 4 being smaller than the rings at least at one point between the edge of the bar and the ends of the recesses. The recesses 4 may either have parallel sides, Figs. 3, 14a, or have divergent sides as in Fig. 19, the width 27 being slightly less than the width between the notches 3. The rings may be interlocked with the recesses by hand but preferably guiding formations comprising a starting groove 5, Figs. 3, 5 a b c, a pin 5<SP>1</SP>, Fig. 12-13 (not shown) or a straight groove 5<SP>11</SP>, Fig. 14a, are provided for means to effect the interlocking. Interlocking means. As shown in Fig. 14a, the means comprises a stiff sheet 18 provided along one edge with slots 26 corresponding to the rings 2, which is filed on the rings. To lock or unlock the rings 2 in the recesses 4, the lower edges of the slots 26 are engaged with the grooves 5" and all the rings moved thereby to the open or closed position. In a modification, a bar is pressed against the grooves 5" from outside the device. As shown in Figs.. 3 top view, 7 bottom view, 19 side view and in cross-section in Figs. 5 a, b, c, a '  slider 6 is provided to engage the starting grooves 5 on the pins 5<SP>1</SP> somewhat in themanner of a zip-fastener. The slider 6, which as shown is for the groove 5, comprises a top 6' and bottom 6", curved to correspond with the curvature of the rings 2, interconnected at one end by a tapered bridge portion 7 which runs between the' side 1<SP>1</SP> of the bar 1 and the ends of the rings 2 when not interlocked. The top 6' has side walls 8, 11 perpendicular thereto, the wall 8 being parallel to the connecting bar 1 and the wall 11 at an acute angle thereto and they converge at the opposite end from the bridge 7. The wall 8 is spaced from the edge 9 of the bottom 6" to form a slit 10 receiving the side of the bar 1 carrying the rings 2, the side 1<SP>1</SP> lying parallel to the wall 8 inside the slider 6. The bottom 6" has a side wall 12 parallel to the wall 11, the inner edges of the wall being spaced to leave a slit 13 adapted to receive the ring ends with the wall 12 entering the groove 5 and the edges thereof being curved in an arc running towards the top 6<SP>1</SP>. A corresponding slot 14 in the wall 8' runs from the vertex of the curve to the end of the wall adjacent the bridge 7 to take the ends of the rings 2 as they aremoved inwardly due to the slant of the walls 11, 12. As the slider 6 is moved in the direction of the arrow 41 to interlock the rings 2 with the recesses 4, the course of the slit 13 . causes each ring to be lifted inwardly beyond the edge of the side 1<SP>1</SP>, over the edge and then outwardly to engage the notches 3 with the recess 4. The slit 14 holds the ring end on the inside of the slide 1<SP>1</SP> of the bar 1 and a bridge 15 is provided on the top 6<SP>1</SP> to lie between the side 1<SP>1</SP> and the groove 5 to assist engagement of the notches 3 with the recess 4. The slider 6 for engaging the pins 5<SP>1</SP> is slightly modified, the side walls 11, 12 being arranged to engage opposite sides of the pins 5'. A handle 17 is secured to a nose 16'on the slider 6 for operation of the slider and a stop at the end of the connecting bar 1, at a slider's length from the first ring 2, limits movement of the slider. As shown in Fig. 19, the recesses 4 may be enlarged at 4' in the direction of inter locking to assist engagement of the rings.