US932801A - Loose-leaf binder. - Google Patents

Description

s. H.- MITCHELL.

LOOSE LEAF BINDER.

APPLICATION ,I'ILED MAY 14-. 1909.

932,801 Patented Aug. 31, 1909;

Snuantoz UNITED STEPHEN HENRY MITGHEIiL, F SAIJJ. IJAKE CITY, UTAH.

, Loose-LEAF BINDER.

Specification of Letters Patent.

Patented Aug. 31, 1909.

Application fiI ed'May 14, 1909. Serial No. 496,976.

I To all whom it may concern:

Be it known th'at I, STEPHEN HENRY. MITCHELL, a cit zen of the United States of America, res ding at Salt-Lake City, in

the countyof Salt Lake and State'of Utah,

have invented certain new and usefulImprovements in Loose-Leaf Binders, of which the following is such a full, clear, and exact description as will enable others skilled in the art to which it appertains to make and use the same.

The object ofthis invention is to provide simplemeans for locking and unlocking the movable. or clamping member of the device, and it consists in certain novel featureshereinafterfully described and particularly pointed out in the claim. i y

In the drawings, Figure 1 is a side elevation, partly in section; and, Fig. 2 is a 1on gitudinal section, taken between the'frame bars of the movable member.

In carrying out the present invention, I employ a base-plate or bar 1 from which I posts 2 rise, the said posts being intended to retain the'loose leaves by passing through openings formed in the same, as will be readily understood. Above the loose leayes,

a slidable frame or casing is mounted on .the

posts, the frame being shown in the drawings as consisting of two plates 3 held rigidly a slight distance apart by connecting bolts or rivets l. These plates are, of course, provided with openings 5,: through which the posts pass, and between the plates'a rockshaft 6 is journaled in suitableybearing's, the said rock-shaft being provided near its ends withradial arms 7 which extend inwardly under a pair. of springs 8 fastened on the upper face of the lower one of the two. bars 3 and one at each end of the frame. The free end of each of these springs is rounded out to embrace the adjacent post 2 and the tendency of the spring is to spring downwardly and thus normally bite into the post On top of each spring is fastened a sup-plemental spring 9 whose free end bears down upon the free end of the main spring S-and assists in forcing it against the post 2, i The rock-shaft 6 extends approximately the full length of the bars 3 and each of its ends is squared off to adapt it to receive a keyor other tool. v

The loose leaves, it will be understood, are

previously prepared with perforations so lift the springs 8 suliiciently to re posts and thus permit the frame to he slid and pressed downwardly upon the leaves.

As. the slidableframe is pushed down over the posts the frictional engagement of the posts and the notched springs 8 will 'cause the free ends of saidsprings to bend slightly upwardly sufficiently to permit the frame to shde downwardly on the posts. Should it be attempted to raise the franie,'howeve r, the frictional engagement between the said springs and posts would cause the springs to bind or bite against the posts and thereby prevent upward movement of the frame. -The surreptitious or accidental removal of leaves is thus prevented, but when the leaves are to be removed, the custodian of theapparatus will apply a suitable key to either end of the rock-shaft and rock the same sufficiently to cause the radial armsor pins 7 to ease the upwardly far enough to unclamp the leaves. The. device is verylsimple in its construe tion, being composed of few parts which are compactly arranged. The slidable clamping frame may be easily pushed downward to more firmly secure the leaves .but can be lifted to loosen or permit removal of the leaves only after the releasing key has been brought into play, as will be readilyund erstood from the foregoing description.

Having thus fully described my invention,

what I claim as new, and desire to secure by Letters Patent, is v In a loose-leaf binder, the combination of a-plate carrying lip-standing posts, a clamping frame slidably mountedon said posts, springs fastened to said frame and'normally grippln said posts to prevent upward movement .0 said. frame on said posts, a rockshaft extending approximately the full lengthof said frame and-adapted to receive an operating tooland provided with lateral pins extending under said springs, for the purpose set forth.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses, a

STEPHEN HENRY MITCHELL. Witnesses:

Enwny J. S;1mnps, GERTRUDE SNEVELY.

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