Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1979-01-10
1981-01-06
Simmons, David A.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156292, B29C 1902
Patent
active
042434599
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.
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patent: 2960090 (1960-11-01), Schugart
patent: 3093530 (1963-06-01), Lippman
patent: 3190678 (1965-06-01), Peterson et al.
patent: 3596928 (1971-08-01), Edmonds
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