US992749A - Pencil-sharpener. - Google Patents

Description

F. A.. BEGKETT.. PENCIL. SHARPENER. APPLIOATIQN FILED MAR. 4, 1910.

992,749. Patented May 23,1911.

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FREDERICK a. BECKETT, oE NEW YORK, N. Y.

PENCIL-SHARPENER.

Specification of 4Letters Patent.

Patented May 23, 1911;

Application led March 4, 1910. Serial No. 547,225.

To all whom 'it may concern.'

Be it known `that I, FREDERICK A. BECK- E'r'i, a citizen of the United States, residing at New York, county and State of New York, have invented certain new anduseful Itmproveinents in Pencil-Sharpeners, of which the following is a full, clear, and exact description.

This invention relates to pencil sharpeners, andits chief object is to provide a simple, inexpensive and withal thoroughly effective device by which a pencil can be sharpened rapidly and easily with the production of a neat, accurate point without waste or breakageof the lead.

To these and other ends t-he invention coiisists in the novel. features of construction and combinationsof elements hereinafter described'.

vIn carrying out the invention in the preferred manner I provide a suitable receptacle orbox, preferably cubical in forni, having an open top and provided near its upper edge with a groove or slot in which the pencil is moved in thesharpening operation.

Mounted within the box, adjacent to theV said slot, is an arc-shaped support carrying a thin, flexible, and preferably double-edged,

blade, which is held flexed in close conformity to the curvature of the support by suitable`means in the nature of a removable clamp. Below t-lie blade supportis a removblade support, with the blade in position.`

Fig. 5 is a plan view of the flexible blade employed. Fig. (l is a perspective view of the clamping device for securing the flexible blade to th*y arc-shaped supporter carrier.

The cubical box 10, open at the top as sliownyand preferably7 of cast metal, serves as a support for the other parts, and its base is flanged or extended as at 11, to perinitit to be screwed to a table or desk 12 or secured by means of clamping devices, such for example as is shown at 13. Vertical and lateral. extensions 13a may also be provided. vfor 'securing the box to a 'wall or other upright support if desired. On the inside of opposite -sides of the box or support n ear the top thereof and Aadjacent to onevof the other sides are two lugs` or shelves 14, on which is mounted the arc-shaped blade-carrier v15. The latter is provided with ears 16 at its ends, resting onthe lugs 14 and detachably secured .thereto by means of thumbscrews 17.. In the forward edge of the bladecarrier isa notch 18 and inthe rear of the notch are two vapertures 19, on opposite sides of the notch but at different distances therefroin, as shown'. Below the blade-carrier, on

' the under or concave side of the same, is the flexible blade 20, provided with two cutting.

edges 2l, 2Q, and having two slightly elongated apertures 23, registering with the holes 19 in the blade-carrier; aiidbelow the blade is a clamping member in the forin of aA spring plate 24 formed with a notch 25 in one edge and having a pairof threaded studs or pins 2G extending upwardly through the registering holes 23 and 19 in the'blade and the blade-carrier respectively. This clamp-- ing member is of less. curvature than the blade-Carrier, but being of spring metalA it may be drawn, and with it the flexible blade 20, intoclose conformity to the carrier by the thuinbnuts 27 on thestuds 2G, thereby`7 holding the blade firmly in place. As shown in Figs. 1 and 2 the clamping member is slightly shorter and narrower than the curved portion of the blade-carrier, and the notch 25 is less deep than the i'iotch 18 in the former, so that the .metal of the clamping member, extending forwardly under the notch 18, will afford adequate support to the fiexible blade :it-thatpoint. These notches expose the cutting edge of the blade, and their forward edges serve as guides for the pencil in the sharpening operation, as will be more apparent hereafter.

In the box-wall adjacent to the blade- 'carrier is an aperture 2S, through which the pencil, indicated atlf), is passed. and at the bottom of the aperture is an inclined troughshaped support 30, in which the pencil slides in the sharpeninfr operation.

The method ot using the|device will no7 be readily understood from theforegoing. The blade being properly clamped to the carrier the pencil is introduced through the aperture 28 into engagement with the blade as shown in Fig. l, and is then retracted, in Which movement t ie blade removes a chip or shaving from the encil. This operation is repeated, the pencil being slightly rotated between strokes, until a pointof the desired length and tapens produced. The chips and sliavings drop into a removable drawer 3l, which may be removed and emptied from time to time as the debris accumulates.

It will be observed that the arc-shaped support gives the blade an arch form. This is one of the most important features of the device, as it gives the flexible blade the necessary stiffness or rigidity and prevents springing or chattering of the blade as the pencil is drawn against its edge.l The curvature of the blade also rounds the point nicely, so that a neatly rounded point can be v produced with ease. The trough 30 and-the blade 2O have such relative inclination as to give a neat taper to the point, and for this purpose the blade itselfis inclined slightly instead of giving all thefinclination to the troughed pencil support so as to afford plenty of room for thehand in manipulating the pencil. This desired downward inclination of the blade is most conveniently accomplished by properly inclining the tops of` the lugs 14 on which the blade-carrier rests.

The location of the blade-holding studs at' unequal distances from the sharpening notch is also an important feature, as it permits two portions of each cutting edge to be used, as will be readily understood.

If desired the box l0 may be presided with a shallow drawer 32, below the chipdrawer or receptacle 31, for holding a supply of blades. The box itself is thus a convenient support for the blade carrier and the receptacles 31, 32.

As previously stated, the en'ibodiment herein illustrated is the preferred form of. the invention, which may be emljiodied in other forms without departure from its proper spirit and scope.

I claim: i

l. ln a pencil Sharpener, in combination,

a rigid arc-shaped blade-carrier, a thin llexi bleblade, and means for holding the blade curved .in close conformity with the carrier \vith"t he` cutting edge of the bladc curved longitudinally,whereby to support the blade .and give thecntting edge thereofthe requisite stilfness,'said blade-carrier exposing the cutting edge on the concave side ot' the blade for engagement with a'pencil applied to such concave side. l n i 2. la a pendii sharpener, in combination,

vand clamping means for holding the blade curved in close conformity to the carrier with the cutting edge of the blade curved longitudinally whereby to support the blade and `give the cutting edge thereof the requisite stiffness, said blade- -arricr exposing the cutting edge on the concave side of the blade for engagement with a pencil applied to such concave side.

, 4. In a pencil Sharpener, in combination, a rigid arc-shaped blade-carrier, a thin flexible blade, means for holding the blade curved in close conformitywith the carrier with the cutting' edge of the blade curved longitudinally whereby to support the blade and give the cutting edge thereof the requisite stillness, and a support for the carrier provided with a guide arranged to direct the pencil into operative engagement with. the cuttingl edge of the blade on the concave side thereof. i

5. In a pencil Sharpener, in combination, a rigid arc-shaped blade-carrier, a thin lexible blade on the concave side of the carrier, and a resilient clamping member provided with releasable mea-ns for drawing the member and the blade into close conforn'iity with the carrier whereby to support the blade and give the cutting edge thereof the requisite stiilness. v i

(l. In a pencil Sharpener, in combination, a rigid'arc-shaped blade-carrier having a notch in its edge, a thin flexible blade mounted on the carrier and having its cutting edge exposed attbc said notch, and means for removably securing the blade to the carrier in close conformity to the curvature thereof, said means being conslruclcdto permit the shi fling olf the blade to expose dillerent portions of the same cutting edge at the said notch.

7. ln a pencil sharpener, in combination, av rigid arc-shaped'blade-carrier having a notch in its edge and provi-ded with apertures spaced laterally from said notch at unequal distances therefrom, a thin flexible blade having apertures in register with those in'v the carrier, and a removable clamping member having binding means extending through said registered apertures to bind the blade in ,close conformity to the curvature of the carrier. y

8. In a pencil sharpcnelyin combination, a ,rigid arc-shaped blade-carrier' having a notch in-its edge, a thin flexible blade mountbut of less depth than the notch in the bladeedf-.on .fthe carrier and haying its cutting carrier. 10

` l:edge exposed at' saidnotch, and a clamping In testimony whereof I 'ax my signature late for binding the blade in close conin the presence of two subscribing witnesses.

5 ormity with the carrier whereby to support FREDERICK A. BECKETT.

' `thelblade and gi-ve the cuttin edge thereof Witnesses:

fthe 'requisite stillness, said clamping'plete S. S. DUNHAM,

h aying `in its edge a notch registering with M. LAWSON Dm.

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