US2039687A - Pencil sharpener - Google Patents

Description

Patented May 5, 1936 PATENT" optics PENCIL snanrnnnn Johannes Ficker and Emil Eckert,

Munich, Germany Application May 13, 1935,- Serial No. 21.24!

s Qlaims. oi. 120-93) This invention relates to alead pencil sharpener and particularly to a pencil sharpener in which safety razor bladesmay be utilized as the cutting instrumentality effective to shave the wood and cut the graphite core. It is an object of this invention to'produce a knife holder and to-provide a guide for the pencil in order-that the pencil may be brought into such relation to the blade that'when tie pencil 1 is turned in the guide in engagement with the a blade, a tapered point will result by a device that has -a pleasing appearance and is without external projecting parts that might cause injury or damage to furniture or to the highly finishedobjects or clothing with which it might come in contact. 1 v a 7 It is a further object of this invention to provide a body having novel means for holding a blade in operative relation to the guide in which the lead pencil is presented to the blade, the said means for holding the bladebeing yieldable in,

order'that it may operate in conjunction with blades of differentsizes, within predetermined bounds, and to provide means lead that is displaced during the sharpening operation. v

It is furthermore an object of this invention to provide means for allowing the escape of shavings or cuttings of the wood portion of the said pencil. l

With the foregoing and other objects in view, the invention consists in the details of construction, and in'the arrangement and combination E of parts to be-hereinafter more fully set forth and claimed.

In describing the invention in detail, reference will be had to the accompanying drawing forma' ing part of this application, wherein like characters denote corresponding parts in the several views, and in which- Figure 1 is a perspective view of a. lead pencil sharpener embodying the invention;

Figure 2 is'a perspective view thereof, with a lidor cover removed; 1

Figure 3 is a sectional view ofthe pencil sharpener with the lid in place;

Figure 4 is a sectional view of the pencil sharpener on the line 4-4 of Figure '1 with the'lid ap- 50 plied;

line 5-5 of Figure 7; a

Figure 6 is a longitudinalsectional view on the lineB-OofFigure'l; Figure 'l is a view in elevation of the rear of for collecting the escape v I Figure-5 is a longitudinal sectional view on the one form of the pencil'sharpener, with the lid omitted; y g

Figure 8 is an underneath plan view of the lid as modified; I

Figure 9 is a longitudinal sectional view on the 5 line 9-9 of Figure 8; and Figure 10 is a view-in elevation of a modified spring for holding the blade in operative position. In carrying the invention into practice, ac-'- cording to the present embodiment of the invention, a rectangular box like body a is employed, through which a screw b extends whose threads engagethreads of a cover or lid c. -It is shown in Figure 4 that the body is countersunk to afford a clearance for the head of the screw. A blade (1 is interposed between'the convex surface '6 of the body and the cover 0, it being shown that the cover has marginal flanges or ribs cwhich aline with grooves or recessesf and j overwhiclr grooves the longitudinal edges of the blade d project and when the screw is turned to draw the cover inwardly, a pressure is exerted on the blade near its edges so'that it is stiffened to withstand the cutting action when operating on 25 thepencil. I

Preferably, at one end, the body is-provided with a guiding channel g which tapers from the outer end to the inner end thereof and it is disposed at such angle to the knife that when a. pencil is introduced or pushed into the guiding channel and turned, the side of the pencil will be shaved or out to a taper or point. The taper of the channel g and its relation to the groove 1' over whichthe knife lies is shown in dotted lines in'FigureZ, H

The body is also shaped'or out to form a longitudinal slot h which merges with the groove f and the cover c'has' its edge recessed as at i to 40 form a. clearance for shavings or cuttings which through the groove 1 and beveled outer surface asat c to aid in the escape of the cuttings.

g a collecting box 1 is formed in the body and the 55 The lid is shown as seated in ai'recess between material of the body is shaped to produce a clearance or recess i at the upper edge of the cover.

' apertures of the blade one, a guide plate m The blade d, which may be of ordinary type, is provided with the usual apertures d. which receive the pins n and n of this invention, and the central hole s of the blade receives the screw b. If the size of the blade yet be used in this device byreason of the fact that the pins or studs 1: and n are yieldable or resilient and they may be held, in engagement with the apertured portions of the the blade may be held under pressure or tension with its cutting edge in operative relation to the channel in which the pencil is placed and manipulated. The relation of parts is such that the studs 11 and n engage the blade at the edges of the apertures hold the blade with its cutting edge in operative relation to the channel in which the pencil is rotated. Other means or a modified construction may be employed for accomplishing the result of holding the blade in operative relation to the pencil and one such modification is shown in Figures'iq and 7, wherein a spring 0, here shown as a flat member seated edgewise in thepartition 1' has itsends embracing the pins n" and n" and the spring is so shaped that it will exert force on the pins 11." and n in the direction of the channel in which the pencil is manipulated. In order to accomplish this result, the aperture s in the blade is slightly largerthan the screw b. t.

As a further modification the result of holding the blade in operative relation to the pencil, a modified cover such as C will be provided with posts or studs 11 and n which will -fit into holes of erably thestuds are resilient material which will have the effect of exerting pressure on the blade to force its cut-v ting edge into operative relation to the pencil.

In the forms of the inventionshown in Figures 2 to '7. the cover c will not be provided with studs, but the posts 1:, n or the pins. 1:", n will be relied upon to efi'ect the result.

Figure 10 shows a further modified means for holding the blade in operative position'to the pencil-and this comprises a spring 0' similar to the spring 0 which may be anchored in the body in the same manner as the spring 0 and as a substitute therefor, but in this modified form, the spring is shaped with 0 at its ends which are intended to enter the and perform the same function as the members 1:" form of the invention shown in Figure 6.

In order to render this pencil sharpener avail-- able for pencils smaller than the normal penmay'be provided which is oscillatable on a pin or stud a anchored at the end of the body, and the said guide plate will have an aperture a smaller than the channel a. The

said plate maybe swung clear of the end of that portion of the body having, the channel a when pencils of normal size are to be sharpened, or it may be swung to cover a portion of the end of the body with its'aperture g in registry with is not normal it may blade so that 1 and exert pressure as stated to for accomplishing operative relation with the blade and prefprovided with Jackets q of I upwardly projecting lugs.

and n of. that a hole in the threaded engagement with the cover and oper- 'ribs of the c support, said support being of a width to hold a blade with its edges overLving the grooves, the said body having recesses on each side of the blade support, blade engaging studs anchored in the body and projecting into thereoesses and occupying holes of the blade. resilient means for forcing the studs toward the guiding channel whereby the blade is forced into perative rela-v tion with a pencil in theguidlng channel, a cover for the blade having ribs engaging the upper surment with the cover and operative to exert a pull on the cover to force the ribs of the cover into engagement with the blade, whereby, the

-. said blade is flexed, the said cover and blade ,the said body having recesses'on each side of the blade support, flexible blade engaging studs anchored in the body and projecting into the recesses and occupying holes of the blade, re-

silient means for forcing the studs' toward'the guiding channel whereby the blade is forcedintc channel, a cover for the blade having ribs engaging the upper surface of the blade. at its edges, and a screw rotatable in the-body passing through a hole in the blade, the said screwbeing in threaded engagement with the cover and, operative to exert a pull on the cover to force the ribs of the cover into engagement with the blade. whereby the said blade and blade having clearances for the escape of cuttings during the pencil operation.

3. A pencil sharpener using safety razor blades consisting of a rectangular blade carrier having a guiding channel for the reception of a pencil and a receptacle port formed as a part of the body and the said body having grooves at the edges of the blade support, said support being of a width to hold a blade with its edges overlying the grooves, the blade'support having its upper surface transversely convex,

on each side of the blade support, blade engaging studs anchored in the body and'proiecting into the recesses and occupying holes of the blade,

resilient means for forcing the guiding channel operative relation with acpencil'in the guiding channel, a cover for the blade having ribs engaging the upper surface of the blade at its edges,

studs toward the the said body having recesses whereby the blade is forced into a pencil in the guiding is flexed, the said cover 5 at its inner end, a blade sup and a screw rotatable in the body passing through blade, the said screw being in ative to exert a pull on the cover to force the over into engagement with the blade, whereby the said blade is flexed, and. blade having. clearancesfor the escape of cuttings during the pencil operation.

4. A lead pencil sharpener using safety razor blades consisting of a rectangular blade carrier having a guiding channel for the reception of a lead pencil and a receptacle at its inner end, a blade support formed as a part of the body and the said cover the said body having grooves at the edges of the blade support, said support being of a width to hold a blade with its edges overlying the grooves, the blade support having its upper surface transversely convex, the said body having recesses on each side of the blade support, flexible blade engaging studs anchored in the body and projecting into the recesses and occupying holes of the blade, resilient means for forcing the studs toward the guiding channel whereby the blade is forced into operative relation with a pencil in the guiding channel, a cover for the blade having ribs engaging the upper surface of the blade at its edges, and a screw rotatable in the body passing through a hole in the blade, the said screw being in threaded engagement with the cover and operative to exert a pull on the cover to force the ribs of the cover into engagement with the blade, whereby the said blade is flexed, the said cover and blade having clearances for the escape of cuttings during the pencil sharpening operation.

5. A pencil sharpener using safety razor blades consisting of a rectangular blade carrier having a guiding channel for the reception of a pencil and a receptacle at its inner end, a blade support formed as a part of the body and the said body having grooves at the edges of the blade support, said support being of a width to hold a blade with its edges overlying the grooves, the blade support having its upper surface transversely convex, the said body having recesses on each side of the blade support. blade engaging studs anchored in the body and projecting into the recesses and occupying holes of the blade, resilient means for ment with the blade, whereby the said blade is flexed, the said cover and blade having clearances for the escape of cuttings during the pen cil sharpening operation, and a plate pivoted directly to the end of said body adjacent a channel to cover and uncover the channel, said pivoted plate having a pencil receiving opening therein of less diameter than the channel and concentric thereto upon the plate being in position to cover the channel. I

6. A lead pencil sharpener using safety razor blades consisting of a rectangular blade carrier having a guiding channel for the reception of a lead pencil and a receptacle at its inner end, a blade support formed as a part of the body and the said body having grooves at the edges of the blade support, said support being of a width to hold a blade with its edges overlying the grooves, the blade support having its upper surface transversely convex, the said body having recesses on each side of the blade support, flexible blade engaging studs anchored in the body and projecting into the recesses and occupying holes of the blade, resilient means for forcing the studs toward the guiding channel whereby the blade is forced into operative relation with a pencil in the guiding channel, a cover for the blade having ribs engaging the upper surface of the blade at its edges, a screw rotatable in the body passing through a hole in the blade, the said screw being in threaded engagement with the cover and operative to exert a pull on the cover to force the ribs of the cover into engagement with the blade, whereby the said blade is flexed, the said cover and blade having clearances for the escape of cuttings during the pencil sharpening operation, and a plate pivoted directly to the end of said body adjacent a channel to cover and uncover the channel, said pivoted plate having a pencil receiving opening therein of less diameter than the channel and concentric thereto upon the plate being in position to cover the channel.

7. A pencil sharpener using safety razor blades consisting of a rectangular blade carrier having a guiding channel for the reception of a pencil and a receptacle atits inner end, a blade support formed as a part of the body and the said body having grooves at the edges of the blade support, said support being of a width to hold a blade with its edges overlying the grooves, the blade support having its upper surface transversely convex, the said body having recesses on each side of the blade support, a cover for the blade having ribs engaging the upper surfaces of the blade at its edges, a screw rotatable in the body passing through a hole in the blade, the said screw being in threaded engagement with the cover and operative to exert a pull on the cover to force the ribs of the cover into engagement with. the blade, whereby the said blade is flexed, the said cover and blade having clearances for the escape of cuttings during the pencil sharpening operation,

said carrier and cover forming cooperating parts,

and blade engaging studs anchored in one of said parts and projecting into recesses, said studs being arranged to engage holes of the blade to retain the blade in operative relation to a pencil in the channel.

8. A pencil sharpener using safety razor blades consisting of a rectangular blade carrier having a guiding channel for the reception of a pencil and a receptacle at its inner end, a blade support formed as a part of the body and the said body having grooves at the edges of the blade support, said support being of a width to hold a"bl a de with its edges overlying the grooves, the blade support having its upper surface transversely convex, the said body having recesses on each side of the blade support, a screw rotatable in the body passing through a hole in the blade, the said screw being in threaded engagement with the cover and operative to exert a pull on the cover to force the ribs of the cover into engagement with the blade, whereby the blade is flexed, the said cover and blade having clearances for the escape of cuttings during the pencil sharpening operation, and blade engaging studs anchored in the cover and projecting therefrom to occupy holes of the blade and retain the blade in operative relation to a pencil in the channel.

JOHANNES ER. EMIL ECKERT.

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