US2662504A - Pencil sharpener - Google Patents

Description

Dec. l5, 1953 O. SCHNEIDER PENCIL SHARPENER Filed July 5, 1952 IN V EN TOR. O T70 CHM/DER Patented Dec. l5, 1953 UNITED STATES PATENT OFFICE PENCIL SHARPENER otto schneider, cincinnati, ohio Application July 3, 1952, Serial No. 297,068

This invention relates to pencil pointers; An object of this invention is to provide an improved Sharpener for pencils employed by draftsmen, designers, engineers, architects and students who require a sharp-pointed pencil their work. The pencil Sharpener commonly used consists of a paddle having sheets of Sandpaper or abrasive glued to the opposite faces thereof, Such Sharpeners will sharpen the lead of a pencil, but the graphite that accumulates on the sandpaper is a source of dirt and smudge, and this dirt and smudge gets onto the drawings no matter how great care is taken to avoid it.

An object of this invention is to provide a Sharpener in which the abrasive is housed within a compartment and which is provided with means for removing loose particles of graphite from the pencil before it is withdrawn from the Sharpener.

` A further object ofthe invention isfto provide a Sharpener in which the abrasive is in the form of a belt which can be advanced with use to provide clean abrasive as and when needed, and which is also provided with means for brushing the graphite particles from the abrasive and collecting it in the housing.

A still further object of the invention is to provide a pencil Sharpener of the type referred to above that is light in weight and inexpensive to manufacture.

Other objects of the invention will in part be apparent and will in part be obvious from the following description taken in conjunction with the accompanying drawings in which:

Figure 1 is a top plan view of a pencil Sharpener embodying a form of the invention;

Fig. 2 is a view in section taken on line III-II of Fig. 1;

Fig. 3 is a view in section taken on line III-III of Fig. 1; and

Fig. 4 is a view in perspective of the abrasive belt support embodied in the Sharpener in the preceding view.

In Fig. 1 of the drawings is illustrated a sharpener I comprising a box-like housing having a bottom section 2, and a cover 3. An abrasive belt 4 is housed in section 2. The belt Il is supported at its forward end on a hollow mandrel 5, and at the rear on a roller 6. The roller 6 is supported from mandrel by means of pins 'I that extend into the hollow of the mandrel through openings I in the rear wall 8 thereof. The openings as shown are adjacent the ends of roller 6. The outer end of each pin is formed with an eye or loop 9 in which are journalled stub shafts I0 and II secured to the ends o1' roller 6. Shaft II ex- 4 Claims. (Cl. 1Z0-89) tends through a vertical slot II' in the end wall I 2 of box section 2, while shaft I0 terminates short of the adjacent end wall I3. A knob I4 is secured to-the shaft and the abrasive belt.

In order that belt 4 may be held taut compression coil springs I5 are provided. As shown pins l extend into these springs. Pins 'I are provided with cross pins I6 which bear against the rear ends of the Springs. When the pins 'I are pushed into the mandrel springs I5 are compressed between the front wall of the mandrel and the cross pins I6.

When roller 6 is inserted through belt 4, the

`springs compressed and the stub shafts are A mounted in the ends of the roller and the eyes of pins l, the belt is held taut.

The mandrel 5 is an elongated member, the length of which is approximately equal to the length of section 2. The ends of mandrel 5 are provided with tongues I8 and I9 that are re. ceived in notches 20 in the top of the end walls of section 2.

The mandrel 5, roller 6 and belt 4 together with the belt tightening means, may be assembled as a unit, and can, therefore, be mounted in place in lox section 2 or be removed therefrom as a uni As may be seen in Fig. 3, the forward or front side of the cover 3 has an opening 2I. This opening 2l extends the full length of the cover so that the entire length of the abrasive belt may be used for sharpening or pointing pencils.

At the right-hand end of the belt, as shown in Fig. 2, there is provided a section of fabric 22 in the form of velvelt or similar material upon which the lead of the pencil may be rubbed after sharpening to remove loose particles of graphite. In order to keep the surface of the abrasive belt 4 clean, including the surface of the fabric section 22, a brush 25 is provided. Brush 25 is disposed of the underside of the abrasive belt and engages it near the forward end thereof. The brush extends the full length of the abrasive and fabric portions of the belt and is supported by a wire frame 26, the ends of which are curled to form Spring sections 2l. The free ends of the spring Sections 21 are anchored in bosses 28 and the ends of box section 2 as shown in Fig. 2.

The cover 3 is so constructed as indicated in Fig. 3 that it may be easily removed or secured in place. The rear edge of the box section 2 is II for turning roller 6 register with lock shoulders 34 at the corners of box section 2, as shown. Thus, when the cover is mounted in place as shown in Figs. 1, 2 and 3, the flange 32 is locked in the slot 3l, and the bosses 33 are nested in the sockets 34.

The box section 2 may be made from suitable plastic which can be conveniently molded to the desired shape. Cover 3 may be made of clear transparent 'plastic/sothat the sharpening' op,eral-r tion may be' observed; *l

The pencil Sharpener as illustrated and described may be mounted or placed on a draftsmans table at any convenient place for him. '12d sharpen the point of a pencil, the pencil 'pint'is inserted into the opening from the riitof;the-A cover, and rubbed on the surface: ci, the abrasive belt. When the point has beensharpned to' th'- desired degree, the loose particles of graphite are` removed by stroking it on the fabric section 22. Wetterwille. remore@ in, the Shetpenlipes seguente@ and. Stored in the box- Ths 19959,.

menne.; cannot be 'pielsd Vun by, the hands. ai;

blown around in the, air by. currents f air. to, be;

deposited on drawings and other surfaces whichr ares@ difcult to keep clean. Therefore, the

Sharpener embodyme my Yinvention has man! Seli-evident advantages over the4 commonlyl usedsandpaper s harpeners. The'graphite removed-inV the sharpening process accumulates in the, box; To` remove it, all one needs todo isto remove the cover 'and the beltV and either wash the 'graphite out or empty it in an envelope which Acan Abe seaiedfand destroyed.

"Having thus'described the invention what is ciaimed'as new and desired to be' secured by Letters Patent is: V

Apencil sharpener comprising a housing having a Abox-like' 'ottm'andab'oven the housing having a'n opening in one side thereolior accoirI meeneem@@mechanismthere@ ing adjacent a sidewall opposite said opening, a mandrel mounted in said housing parallel to said roller and disposed adjacent to the sidewall containing said opening, means for rotatably supporting the roller from the mandrel, and an endless belt having an abrasive coating thereon, said belt being trained over said mandrel and roller, the mandrel serving as a backing member for the belt 'en af.' pencil inserted through said opening sbeing- 'shrpen'd'on ther belt.`

` 2. A pencil Sharpener according to claim 1 characterized by the fact that means are provided ici; yieldingly urging the roller in a direction to tignteffid beit.

"STA "pncilfsharpener according to claim 1 chara'xcterizedby the fact that a brush is disposed w'tliii'th Lliu'sirfgon the underside of said belt anda-*mounted to engage the belt to remove graphite therefrom as the belt is advanced by said roller.

li: A pencil Sharpener. according to claim 1 characterize y OTTO 3.0319311953;

sty witntii'lenetr ofthebeit', andi-,nat

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