US1793558A - Portable automatic pencil sharpener - Google Patents

Description

Feb. 24, '1931.

T. NlsHlMURA PORTABLEUTOMTIC PENCIL SHARPENER /NveN TWK Affili/fl,F/

Ay MMM@ Filed Deo. 9, 1929- Patented Feb. 24, 1931 UNITED STATES PATENT OFFICE PORTABLE AUTOMATIC PENCIL SHAIR'PENER Application led December 9, 1929, Serial No. 412,856, and in Japan December 14, 1928. v

The present invention relates to a portable automatic pencil Sharpener, wherein a screw cutter is rotatably mounted adjacent a hollow conical part connected with a hollow 5 cylindrical bushing; a cylindrical pencil holder having the splits u to near its end is inserted in the bushing t rough a toothed wheel at its rear end; keys projecting in the interior of said wheel engage with said 19 splits; a toothed wheel is geared between said wheel and the wheel at the rear end of the cutter, toothed wheel being provided with a hand crank; the pencil holder and the cutter are connected together in such a manner that each rotates around its own axis simultaneously in the same direction, the holder being also slidable vertically; and aclamp is screwed to the end of the holder so that the pencil is clamped by it and pressed gradually into the bushing together with the holder as it is sharpened. The object of this invention is to obtain such a portable and endurable vpencil Sharpener that it sharpens the pencil automatically and neatly only by holding it with one hand and rotating the crank with the other hand and accordingly can be used easily even by little children.

Referring to the accompanying drawings,

Figure 1 is the longitudinal side View of the pencil Sharpener according to this invention;

Figure 2, the front View having no pencil;

Figure 3,'the enlarged longitudinal side view of the pencil holder;

Figure 4, is a sectional view on line 4 4 of Fig. 1 and Figure 5, the side view partly in section of the modification of the present invention.

In the drawings, 1 is a bushing consisting of a hollow cylindrical body and a hollow conical body. A screw cutter 2 is rotatably mounted adjacent the longitudinally-split outside of the conical part of the sheath by means of metal pieces 3 and 4 and has a toothed wheel 5 upon its upper end for rotating it. In the bushing there is inserted through a toothed wheel 8 at its rear end a cylindrical pencil holder 6 which can slide in contact with the interior wall of the bushing 1 and which have the splits 7 cut vertically from near its top to the bottom.' These splits 7 assist the holder 6 in clamping the pencil. and also engage with keys 9 projecting in the interior of the wheel 8, so that the holder 6 may rotate according to the revolution of the wheel 8, when it may also be able to slide vertically lalong the keys 9 in the bushing. The end of the holder 6 has an inclined surface 6 (Fig. 3) and has a screw threaded part in connection with this inclination. To this part is fixed a clamp 10, a grip 11 is attached rotatably which has a clasp 12 to prevent it from getting out. Also, a toothed wheel 14 is provided at one side of the bushing 1, and it 1s engaged with the toothed wheels 5. Therefore, the cutter and holder rotate simultaneously in the same direction and -consequently the contactparts of the cutter and pencil rub each other in the opposite direction. 16 is a iece for preventing the wheel 8 from movlng vertically along with the holder and has it xed to the side of the bushing 1. The cutter has a cover 18 of suitable material so as to facilitate the grasping of the Sharpener on the palm. Said cover may have an enlarged end having a lid 19-which is opened when it is desired to take out the chips accumulated in the enlarged part'.

In this invention two cutters ma be fixed oppositely to the conical part of the ushing 1; In this case, a toothed wheel 5 is provided at one end of each cutter so that it engages with two wheels 14 both being geared with a toothed wheel.

The following is the manner of using this article First draw out the holder 6 slightly from the bushing 1, loosen the clamp 10 and insert a pencil deeply enough thereinto, after which the clamp is tightened. Then, put the cover 18 on the palm of the left hand and support the grip 11 with the thumb and the forenger, grasping the bushing and cutter, and turn the crank with the right hand, pressing the holder toward the bushing 1 with the left hand. As regards the Sharpener shown in Fi ure 5,. turn its. end toward the thumb of the le hand and grasp the bushing and cutter, and, sup- 'lso port the grip 11 with the little finger and turn the handle with the right hand, pressing with the thumb of the left hand the edge of the metal piece 4 at the end of the cutter. Then, the pencil and cutter will rotate simultaneously in the same direction according to the rotation of the crank, whereby the contact parts of the pencil and cutter rub each other in the' opposite direction and the pencil can be pressed gradually into the bushing during sharpening thereof. Thus, the .point of the plncil can be sharpened neatly in conical s ape.

There is the Sharpener to which the screw cutter is applied, but according to the resent invention the whole Sharpener includin the cutter can be grasped on the palm an the cutter can be rotated in that position. If you simply hold it with the left hand and turn the crank with the right hand, pressing the grip and sheath with the left hand, the pencil will be sharpened neatly and rapidly, even by little children. I

Claims:

v 1. In a pencil Sharpener, the combination of a rotary cutter having a toothed' wheel connected therewith, a bushing lixed adjacent the cutter, a pencil holder slidable in the bushing and having longitudinal slits therein, a wheel on the holder having keys carried thereby, for slidably engaging the slots to permit sliding of the holder in the bushing during the sharpening operation, a wheel in mesh with the rst mentioned wheel, and a crank for rotating the latter wheel to impart rotary movement to the wheels and to the holder.

2. In apencil Sharpener, the combination of a rotary cutter, a bushing adjacent the cutter, a pencil holder having longitudinal slits therein, a toothed wheel having a central opening receiving the holder, keys extending into the opening and engaged in said slits to slidably interlock the Wheel and holder to Eermit the holder to move vertically in the ushing during rotation ofv the cutter, and means for simultaneously rotating the wheel and cutter.

In testimony whereof, I have signed myv naine to this specication at Tokyo, Japan, this 18thV day of November, 1929.

- TOKUZO NISHIMURA.

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