Books – strips – and leaves – Book or leaf holder – Cooperating with leaf fold
Patent
1974-05-31
1979-02-06
Schnall, Jerome
Books, strips, and leaves
Book or leaf holder
Cooperating with leaf fold
281 29, B42D 1300, B42D 302
Patent
active
041381432
ABSTRACT:
The invention relates to loose leaf binders for holding periodicals and the object of the invention is to provide a loose leaf binder having a curved back and no rivets visible from the back.
For this purpose, the paper-retaining means are fitted to an inner flat spine which is connected to the covers by means of welds extending along the hinge lines between the covers and the outer spine. The covers consist of boards enclosed in flexible polyvinyl chloride sheeting and the outer spine is reinforced with a semi-rigid polyvinyl chloride strip. The inner spine consists of a strip of board enclosed in flexible polyvinyl chloride sheeting, the width of the sheeting being greater than the width of the board strip so that flexible hinges are produced on each side of the strip. When the inner spine is assembled with the covers and outer spine, the welds are produced along the hinge lines so that there is no tendency to tear out the inner spine when the covers are opened and closed.
REFERENCES:
patent: 1143562 (1915-06-01), West
patent: 1246243 (1917-11-01), Daniels
patent: 1495467 (1924-05-01), White
patent: 2322298 (1943-06-01), Johnston
patent: 2390125 (1945-12-01), Schade
patent: 2790651 (1957-04-01), Winstead
patent: 2809852 (1957-10-01), Miller
patent: 2960090 (1960-11-01), Schugart
patent: 3190678 (1965-06-01), Peterson et al.
patent: 3596928 (1971-08-01), Edmonds
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