US762427A - Loose-leaf binder. - Google Patents

Description

. No. 762,427. A PATENTED JUNE 14, 1904.

' S. H. MITCHELL.

I LOOSE LEAF BINDER. APPLIOATION rILm 00T. 1s. 190s.

UNITED STATES STEPHEN H.. MITCHELL,

Patented June 14, 1904.

OF CHICAGO, ILLINOIS.

Loose-LEAF BINDER.

vSPEC-IF'ICATIION forming part of `Letters Patent No. 762,427, dated June 14, 1904. Application filed October 19, 1903. Serial No. 177,566. (No modell.)

To rl/Z whoml it may con/cern,.-

Be it known that I, STEPHEN H. MITCHELL,y

aeitizen of the United States of America, re-

siding at Chicago, inthe county of Cookand- State of Illinois, have invented certain .new

and useful Improvements in Loose-Leaf Binders, of which the following is such a full, clear,

ledgers, and has special reference to the means for causing the covers to move toward oraway from each otherand for locking the device after .the leaves have been inserted. The invention consists in certain novelfeatures hereinafter rst fully described and then l particularly pointed out in the claims.

i In the annexed drawings, which fully illustrate my invention, Figure l i.s a ,View look? ingat'the inner side of the end or back of the binder and showing it adjusted to permit the insertion of the leaves. Fig. 2 is a side view of the same. Fig. 3gis a view similar to Fig. 2, but showing the device closed. j Fig. 4 is a sectional view taken between the rack-bars and t adjacent end of the binder, andrFig. 5 isa etail perspective View of vthe locking device.

AA and at or near the ends of the saine are formed rack-bars D, and on .the edges of the ends of the upper member E of the back A are formed inwardly-projectingiianges F, having rack-bars G formed on their rear faces in the same plane with the rack-bars I). A shaft or rotatable rod H extends along the backA and is provided with pinions I, meshing with the .rack-bars D and Cr, whereby when the rod is rotated the rack-bars will be caused to slide in opposite directions, so as to move-the covers toward or away from each other. The movement of the covers will cause the posts B to be extendedl or contracted, as will be readily understood. y

One end of the shaft or rod H is extended beyond the adjacent pinion and is given an angular. formation, as sho'wn at J. Mounted is a plate K, having a pintle L at its lower end projecting over the adjacent rack-bar. Pivotally hung on this pintleL is a pawl M, adapted to engage the rack-bar and held normally in engagement therewith by a spring N, secured on the pintle and bearing on the back of the pawl, as clearly shown. The end of the pawl is formed into a tooth O, having its upper or outer face arrangedpapproximately perpendicularly to the teeth of the rack-bar, while its under or inner face is beveled or arranged more nearly parallel to the outer ends of the teeth. By this formation I permit the covers to be readily moved together to hold the leaves inserted therebetween; but an accidental or unauthorized attempt to separate the covers will be prevented -by the tooth dropping into the space ybetween the adjacent teeth of the rack-bar, and thereby locking the rack-bar against movement. Movement of the opposing rackthe inability of the pinion to rotate. l Projecting from the outer face of the pawl is an arm P, which extends -over the angular en d of the rod or shaft H and has its extremity formed into a finger Q, having -a beveled orinclined lower edge which isfnormally close to the said angular end of the rod or shaft H. lWhen. it is desired to open the binder in order to insert a leaf or number of leaves, it is nccessaryto usea key R, which is inserted throughlthe ends of the members of the back and engaged on the angular end o f the shaft The end of 'the key strikes against the inclined edge of the finger Q, and thereby lifts or pushes the same away from the shaft, and consequently disengages the pawl from the rack-bar. If the key be then bar isasimultaneously prevented, because of' on the rod in juxtaposition to the saidpinion l rack-bars caused to recede from each other.

The rack-bars being formed on the members of the back the said members will be caused to move away from cach other, so as to un cover the pin portions of the telescopic posts, and consequently permit the insertion or removal of a leaf. Slots S are formed in the ends of the back members to facilitate the insertion of the key and permit the members to slide past the key in the operation of the device.

From the foregoing description, taken in connection with the accompanying drawings, it is thought the operation and advantages of my device will be readily appreciated. The parts of the device are few and' simple in construction and are all within the side lines of the same, so as to be protected against breakage through sudden sharp blows.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, iss 1. In a binder, the combination of the telescoping back members, rack-bars on said members, pinions engaging the said rackbars, means for rotating the pinions to actuatc "maaar their inner faces, pinions engaging saidracln bars, a shaft carrying said pinions and. having an angular end adapted to be engaged by an operating-key, and a pawl engaging one of the rack-bars, and having an arm projecting over the angular end of the shaft and provided with an inclined edge adapted to be engaged by the operating-key.

In testimony whereof ll have. signed this speciiication in the presence et' two subscribing witnesses.

STEPHEN H. MTCHELL Vifitnesses: l

JoHN RomNsoN, "WILLIAM lul. SrunLDs.

Images