A-A-2810 Binder, Loose-Leaf, Coated Cloth Bound, Stiff Covers (For Tabulating Machine Paper And Accessories)This commercial item description covers requirements for flexible-post binders for containing unburst marginal punched tabulating machine paper and accessories. Covers are separable and have a binding mechanism with locking devices for containment of contents.

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A-A-2810A

Class 1. Class 1 binders shall be designed for loading or withdrawal of sheets from the top and bottom of the binder.

Class 2. Class 2 binders shall be designed for loading or withdrawal of the sheets from the top of the binder only.

Style A. Style A binders shall be designed so that the cover stubs turn into the binder and have an inside locking mechanism.

Style B. Style B binder shall be of a mechanical hinge, piano style, with an outside locking mechanism in the top hinge plate, and be designed for loading from top only.

3.2. Construction (general). Each binder shall consist of two separable covers, hinged to cover stubs or plates, as applicable, for containment of a binding mechanism. Construction shall be such that no parts of the binders will mar smooth surfaces. Metal hinge components shall be properly secured and aligned. Hinges shall be recessed into plates in accordance with normal commercial practice, and plates and covers shall lay flat on smooth, even surfaces. Covers shall have round corners on the side of the binder, parallel to the binding side.

3.2.1. Covers. Covers shall be paperboard, as specified in 3.3.3, securely glued over the entire area of contact with the covers. The coated-cloth binding for each cover, including hinge and stub, shall be of one-piece construction (without splices), and shall conform to 3.3.1. The binding material shall be carried over the inside surfaces of the covers, except the binding edge, at least 9.5 mm (3/8”). On the binding side, the coated cloth shall extend beyond the edge to fabricate the hinge and fold back on the inside of the binder cover in a manner to completely cover the stub and reinforcing material, overlapping the binding edge of the cover at least 31.8 mm (1-1/4”). The overlap at the top and bottom edges of covers shall extend to overlap the top and bottom edges of the hinges and stubs for the same distance as on the covers. The overlapping binding material shall be secured to the covers and hinge in a manner that the edges are neatly and securely turned in, and there are no frayed or loose ends which will tear or pull out when the binder is in normal use. Each cover hinge shall be glued together and stubs shall be reinforced with black fiberboard, or equivalent, 0.76 + 0.05 mm (0.030 + 0.002)” in thickness and the approximate width of the binding mechanism. A paper lining, as specified in 3.3.4, shall be securely glued over the entire area of contact with the inner surfaces of the covers and with the binding material. The lining shall overlap the turned under edges of the binding material.