Pleger, John J · Chicago : The Inland printer company · leaf 221
BINDERS. The mechanical construction of Figs. 1-3 consists ofa three-piece round back made of steel, and rigidly con-nected. It is operated by a propelling screw rod, havingright and left triple threads carrying traveling nuts,which are connected with side plates with heavy steel arms. The screw… … Fig. 3. are polished and corners and edges are rounded. Speciallocks can be attached to these metal fasteners, which havespecial grooved keifs. They can be attached to the insideof the back, and strengthen the mechanism. The samekey that unlocks the binder operates the controlling screw (200) LOOSE…
Bookbinding
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