A-A-2642
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.
B. Construction (general). Each binder shall consist of two separable covers, hinged to cover stubs or plates, as applicable, 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.
Covers. Covers shall be paperboard, as specified in 1.C.(3). The binding material shall be plastic, as specified in 1.C.(1), and shall completely cover the inner and outer surfaces of the board extending beyond the covers to fabricate the hinges and stubs.
Hinges. Hinges shall consist of at least two layers of plastics which extend from the covers and shall be reinforced over the entire area of hinge with vinyl-impregnated nylon cloth, or by other means which will provide equivalent reinforcing strength and flexibility to that of the specified cloth. A strip of black fiberboard, or equivalent material, 1.14 + 0.0762 mm (0.045 + 0.003)” in thickness and the approximate width of the binding mechanism, shall be bound into each cover stub for reinforcement and mounting of the binding mechanism. All edges of the binding material shall be heat sealed.
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 6.e).
(a). Class 1, Style A. The binding mechanism 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.
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