US630375A - Letter-file. - Google Patents

Description

uw 9 8, nw u A d e t, n e t a P No; 630,375. v E. C. MAGNUS.

LETTER FILE.

(Application med Jan. 1s,- 1s99.)`

(mi Model.)

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UN-lrT-ED-f;N STATES lPATENT OFFICE.

EDNVARD CHARLFSMAGNUS, OF POPPELSDORF-BONN, GERMANY.

LETTER-FILE.

SPECIFICATON fdgming para of nettersratent No. 630,375, dated August s, 1899.

Application iilecl January 18, 1899. Serial No. 702,582. (No model.)

T0 all whom it may concern:

Be it known that I, EDWARD CHARLES MAG- NUs, a citizen of the United States of America, and a resident of Poppelsdorf-Bonn, in the Province of the Rhine, German Empire, have invented certain new and useful Improvements in Letter-Files, (for which application for patent was filed in Germany on the 3d of Decelnber, 1898,) of which the following is an exact specification.

Certain letter-tiles or letter-clamps hitherto used were of such a construction that the wire clamping-frame was acted upon by a spiral spring attached to the frame at one side and to the board of the file at the other side, so that the frame was under tension in its open as well as in its closed position. In both positions the spring acted upon the frame at an acute angle and through the intermedium of a short lever-arm, its force thus never being fully utilized. In consequenceof this cornparatively feeble' pressureV the4 documents, when the file was hanging vertically,`were apt to slip out and fall. `The unfavorable action of the spiral spring was increased when a greater number of letters was under the clamping-frame, as the frame as it was raised away from. the board-caused the angle at which the spring acted upon the extension part or handle-piece of the frame to grow more acute, thereby decreasing the pressure of the frame against the board. In its open position the frame was held by the spring under an increased tension and when released, after having passed the dead-center, Was violently thrown onto the board. Using a more powerful spring for the purpose of securing greater pressure of the frame upon the board would not be advantageous, as this would naturally enhance the drawback mentioned.

To prevent this inconvenience is the object of my invention, in which the spiral spring acting upon the frame is not attached, as usually, tothe board proper, but to a revoluble disk or similar device in such a manner that, according to the two extreme positions of the disl,the spring either presses the frame downup'on the`docnments on the board with its forceincreased by a long lever-arm or it tends to draw or lift the frame away from the `frame c is the ordinary one. sion-piece c of the frame is covered by a cap the board. The intermediate positions of the disk allow of regulating the tension of the spiral spring within certain limits.

In order to make my invention more clear, I refer to the accompanying drawings, in which- Figure l is a side view through my letterclamp, the wire clamping-frame being pressed down upon the board, its positionwhen lifted being shown in dotted lines. Fig. 2 is a top view of Fig. l. Fig. 3 is a back View of Fig. 1. Fig. 4 is a side view,`the lframe heilig lifted. Fig. 5 is a top view of Fig. 4, and Fig. 6 a rear view of Fig. 4.

In all the figures the board is only partly shown, and similar letters denote similar parts throughout the various iigures.

On the board a as usually employed is fastened a metal part b, provided with a bearing for the 'clamping-frame c. The shape of The extene, into which is hooked the one end of the spiral spring d. The other end of the spring is attached to a short arm f', revolubly attached to the bearing-plate b by means of a stud g. The short arm f' forms a bell-crank lever with an arm 7L, having at its free eX- tremitya wing or thumb-piece 7c, the arms f' and h being adapted to rotate one hundred and eighty degrees around the stud g.

In the position shownin Figs. 1 to 3 the clamping-frame c is forcibly pressed against the board cr. i

In the position shown in Figs, 4. to G the bellcrank lever f 7L is turned so that the shorter arm f', to which the spring d is attached, points vertically downward, which position causes the spring to act from this lower point, whereby the extension-piece c' is drawn down and the frame proper, c, lifted. The accidental and forcible flying back of the frame upon the board is thereby absolutely prevented, Which cannot be attained with this class of letter-files as hitherto constructed.

Having thus fully described the nature of this invention, what I desire to'secure by j Letters Patent of the United States isw i In a letter-file, the combination ofa boardplate a, with a clamping-frame c having an extension-piece c' provided with a cap e, a

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plate b xed to the board-plate andforming the bearing of the clamping-fram@ a bellerank lever` f h revolubly attached to the plate b, a spiral spring d fixed to the cap e I and to the shorter arm f of the bell-crank lever f h, the whole substantially as and for y the purpose set-forth.

In Witness whereof I have hereu-utoset my hand in presence of two Witnesses.

EDWARD CHARLES MAGNUS.

Vitmesses:

WILLIAM H. MADDEN, CHAS. E. BARNES.

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