US1570767A - Loose-leaf book or bindedr - Google Patents

Description

Jan. 26 1926.

4 J. W. MYATT moss LEAF BOOK ow anmzn Filed May 29, 1925 111, 1 ezv'b olz QI Z 7. wit

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Patented Jan. 26, 1926.;

UNITED STATES PATIENT OFFICE.

JOHN WILLIAM MYATT, OF TIPTON, ENGLAND, ASSIGNOR TO LEDGERS LIMITED, OF

TIP'ION, ENGLAND.

LOOSE-LEAF BOOK OR BINDER.

Application filed May 29, 1925. Serial No. 33,787.

To all whom it may concern:

Be it known that I, J oHN lVILLIAM MYA'r'r, a British subject, residing at 37 Victoria Road, Tipton, in the county of Stafford, England, have invented certain new and useful Improvements Relating to Loose-Leaf Books or Binders, of which the following is a specification.

This invention relates to loose leaf books or binders of the type in which the leaves are secured between a pair of clamping bars by a screw connected to the bars and arranged transversely to the leaves.

hen a single central screw is used in conjunction with a pair of clamping bars it is found diflicult to obtain the required security of the sheets, owing to one of two reasons; either the bars bend and cause the pressure to be localized around the screw, or, when the bars are sufiiciently rigid, the distributed pressure is insufficient to give the required security. To avoid this difficulty it is usual to employ two screws spaced at a convenient distance apart. This device enables an effective grip on the sheets to be obtained, but it involves either separate actuation of each screw or mechanism for enabling both screws to be operated simultaneously.

The object of the present invention is to enable the required security to be obtained by a single screw, and for this purpose the invention comprises the employment of means whereby the gripping action of the binding screw exerted on the leaves is localized at positions intermediate of the screw and the edges of the leaves.

Referring to the accompanying sheet of explanatory drawings Figure 1 is a side elevation and Figure 2 a rear elevation of a loose leaf book provided with this invention.

Figures 3 and t are rear elevations illustrating modified constructions.

The invention is capable of being carried out in a variety of ways. The simplest, and the one in which the underlying principle of the invention is applied most directly, consists as shown in Figures 1 and 2 in the use of clamping bars a which are gapped, or recessed or otherwise provided with end projections Z) on opposite sides of a central screw 0 and nut d so that the clamping action is exerted on the leaves 7 at positions situated on opposite sides of the screw and separated therefrom by a suitable distance which is easily found by trial. Thus for instance, as shown in Figures 1 and 2, the projections are arranged at the end of the bars, but they may be arranged at other portions nearer the screw as shown in Figures 3 and l. By so distributing the gripping action and transferring it from the region of the screw to other regions at a suitable distance apart, the one screw can be caused to effect a security which is equal or comparable to that ordinarily obtained by two screws.

Referring to Figure 3, a pair of hollow or tubular clamping bars 6 are used, each being flat throughout its length, and with in each bar is arranged a stiff bar a which is gapped or shaped along one side as aforesaid, the screw and not being attached to the inner bars. Holes are formed in the in nor surfaces of the outer bars 6 through which end portions 6 on the inner bars may project to exert a direct gripping action on the leaves.

The construction shown in Figure 4 differs from that of Figure 3 only in that the projections b are formed as separate studs formed with shanks which are pressed into holes in the bars a. Telescopic posts 9 may be arranged in any ordinary and convenient manner as shown in conjunction with either the bars a or 6.

From the foregoing it will be apparent that the invention is capable of bein carried out in a variety of ways, but 1n all cases a single screw is associated with an element or elements whereby the gripping action is exterted at a distance from the screw. In the drawings the amount by which the projections 6 project beyond the faces of the parts a or c has been slightly exaggerated to make the invention clear. A less projection is equally useful. The least permissible amount of projection can easily be found by experiment.

By this invention an important simplification is obtainable in loose leaf book or binder mechanisms of the type referred to, with resultant advantages to both the manufacturer and the user.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is 1. In loose leaf books or binders of the type specified the combination comprising a binding screw a hollow bar, a rigid clamping bar contained within the hollow bar, and leaf gripping projections on the rig-id bar extending through one side of the hollow bar at a distance from the screw, substantially as described.

2. In loose leaf books or binders the 00111- bination comprising a pair of clamping bars each provided with leaf gripping projections located on opposite sides of the centres of the bars, and a centrally arranged single binding screw connecting the bars, substantially as described.

3.111 loose leaf books or binders, the combination comprising a pair of hollow bars, a rigid bar in each of the hollow bars, leaf gripping projections on the rigid bars extending through the hollow bars, and a centrally arranged single binding screw connecting the said rigid bars substantiall as described;

In testimony whereof I have signed my name to this specification.

JOHN WILLIAM lilYATl.

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