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

3.2.2. Style B. Covers shall be paperboard, as specified in 3.3.3, bound with coated cloth as specified in 3.3.1. Binding shall be securely glued over the entire area of contact with the covers. It shall be carried over the inside surfaces of the covers at least 9.5 mm (3/8”). 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. Lining on inside of each cover shall overlap the turned under edge of the binding material, and shall overlap and be secured to each metal hinge plate, attached to the cover, in accordance with standard commercial practice.

3.2.3. Binding Mechanism. Post holes shall be provided in both top and bottom covers to receive and securely retain flexible posts. All binders shall have two post holes spaced on proper centers to utilize sprockets feed holes of the sheet size specified. Requirements for additional post holes (multiple spacing) shall be as specified (see 8.1.5).

3.2.3.1. Class 1, Style A. The binding mechanisms shall consist of two channel bars fabricated from cold-rolled steel 0.46 + 0.05 mm (0.018 + 0.002)” in thickness. One channel bar shall be attached to each cover stub by at least three metal rivets or grommets. One rivet or grommet shall be positioned in the center and one near each end of the binding mechanism. The rivets or grommets shall have sufficient upset to permanently secure the channel bars to the cover stub. Each channel bar shall have post holes in the number and with center spacing specified, and shall be fitted with two slide locks to secure the flexible posts. Stops for slide locks shall be provided in each channel bar. The slide locks shall be made of steel or plastic material. Plastic slide locks shall conform to 1-2-1 of ASTM D 1788. Slide locks shall be of sufficient thickness and design to withstand repeated opening and closing. When covers are attached to the binding mechanism, post holes shall be in alignment.

3.2.3.2. Class 2, Style A. The binding mechanism shall be as specified in (a) above except that the bottom channel bar shall be without slide locks and shall have post holes to accept the flexible posts. Alternately, at the option of the manufacturer, a steel bar or bar with post holes to accept the flexible posts may be furnished in place of the bottom channel bar, provided it is equal or greater in thickness to the channel bar specified above.