US1160091A - Pencil-sharpener. - Google Patents

Description

l. K. STEWART. PENCIL SHARPENER. APPLICATION FILED IuLY 6.1914.

x?. I ew 9. m a w W 1w n m W Bill/[Ill w T BAEB# BAT JOHN K. STEWART, 0F CHICAGO, ILLINOIS, ASSIG'NOR T0 STEWART MANFACTURING COMPANY-y CHICAGO, ILLINOIS, A CORPORATION 0F ILLINOIS.

PENCIL-SHARPENER.

Specification of Letters Patent.

lPatentedNov. 9, 1915.

aptncation filed July c, 1914. l' serialY No. 849,104.

It consists of the features and elementsf described .and shown in the drawings asindicated in the claims.

In the drawingsz-Figure 1 is a side elevation of a device embodying this invention, having the case broken away to show the interior parts. Fig. 2 is a section at the line` 2-2 on Fig'. 4. Fig. 3 is a section at the line 3-3 on Fig. 4. Fig. 4 is a. section at the line, 4 4, on Fig. 2. Fig. 5 isajsection'at the line. 5'-5, on Fig. 4.

The device shown in the drawings comprises a casing,-A, which is preferably die# cast and integral. This casing comprises as an integral part thereof an elongated shaft bearing, 3, protruding outwardly, and a fixed internal gearl or` annularinternally toothed rack, 4, formed in a h'ollowed boss or flange, B2, projecting inward in the' casing co-axial with the outwardly protruding shaft' bearing, 3. Journaled in the bearing, 3, is a rotating member, B, havinglan elongated spindle, 5, for journaling ,in said shaft bearing and-projecting there-beyond to receive an operating handle, 6, and havf ing a circular base, B1, around Athe inner end of the spindle, which base enters within and closes the cavity of the inwardly-projecting boss, B2, whose inner end constitutes the internally-toothed rack, 4, above mentioned. The cavities thus inclosed may serve as a grease pocket forlubricatioh ot. the spindle the circular base closing said pocket, serving to prevent the grease from Yescaping so as to soil the pencil or Vmingle with the shavings. The rotating member is of such dimension as to extend entirely through the casing and there-beyond at the end opposite the spindle in the form of a hollow boss, 7, whose axial cavity constistutes a pencil'guide. This pencil guide protrudes at the center of the circular head, 8, of the rotating member, which head guides and closes a .circular aperture in the wall of' the casing, A, at the side opposite that at which the internal. annular rack, 4, is situated. At thejportion of the rotating member which extends between the front andrear walls of the casing,-that is, from the face of the spindle, 5, to the inner face of the head, 8,-it is provided with diametrically opposite recesses, 10,10, which accommodate rotating cutters', 11, 11, each having at its 'end toward the spindle a bevel gear, 12, said bevel gears meshing with the internal annular rack, 4. These cutters 'are eachaxially apertured and 4journaled for rotation uponv a shaft, 13, which is inserted through the head, 8, on the outer side 'thereof, havlngthe opposite end threaded and screwed into the rotating memberv at the shonlderwhich defines the inner end of the recess in which the rotating cutteris ac-` .commodated rlhe two cutters are each cylindrical with spiral cutting edges, 15, each of said `cutting edges extending continuously from one end `to 'the other of the operating portion of the length of the cutter.

at an acute angle vlto each other which-isA bisected byv aplane through the axis of rotation of said member, said cutters converging from outer to inner end, that is, from the end at which the pencil guide is situated to the end having the pinions for meshing with the internal rack. 'll`he recesses formed in the rotating member to accommodate the two cutters thus Yconverging toward'the pinions, cut into each other as they approach said end toward which they converge, leaving standing between the cutters a tapered portion of the substance of thef" rotating member aty the inner end of the pencil-guide-way; and said pencil lguide is bored tapering at said inner end, forming a' tapering seat between the two cutters at their di'verging ends. The conical bore for this tapering seat'cuts into the portion of ,the rotating member left standing between `'lheysare mounted in the rotating member sharpened or cut away,

be forced in only as fast as the polnted lead vagainst said bar,

pinions engaging the annular' rack, while they receive planetary motion about the pencil axis by-rotation of said rotating member about the said axis.

` The two cutters are mounted in the rotating member so that their cutting edges just clear each .other at their proximate ends, and they are reduced in diameter beyond that point forming lannular shoulders, 18, between which there is mounted on the carrier a stop bar, 20, which extends across'the axis of the rotating member and of thepencil to vbe sharpened, and forms a stop for the point of the pencil so that when the pencil has been sharpened to the finest point for which the device is adapted, that point rests farther 'pushed 'in of the reduced point .will crumble under the pressure as and the pencil. can

' crumbles.

The case 1s cut away' at one side of the' lower end forming' an opening, 22; tore 'ceive a slide drawer, 23, which stands below the cutters and receives the pencil 'trim'- mings.

I claim 1. A pencil sharpenercomprising a casing having a shaft-.bearing extendingoutwardly from one end thereof and having at the same end an annular inwardly-projecting ange concentric with lsaid bearing and forming a chamber about the inner end thereof; a rotating member having a spindle journaled in said shaft-bearing, and a circular base which closes the inner end of said chamber; cutters journaled .for rotation in said rotating member between the end having the spindle and the opposite end thereof,'said Icutters being provided with means lfor engaging said annular flan-ge' for rotation of the cutters in the rotating member when the latter is rotated in the casing.

2. A pencil sharpener comprising a casing having a shaft-bearing extending outwardly from one end thereof; al rotating A member having a spindle journale'd in said shaft-bearing; diverging cutters journaled in said rotating `member betweenv the` end having the spindle and the opposite end thereof, for rotation both in and with said rotating member,- said member having at the end opposite the spindle a circular head whose diameter is at least 4as great as that of the path of rotation of said cutters about and if the pencil is still' by the -,operator the lead fast as the pencil is. furtherl the spindle axis at the point of greatest diameter of said path, and the case having at the end opposite said shaft bearing a cir- -cular opening which said head fits and closes when the rotatingmember is in operating position in the case.

3. A pencil Sharpener comprising al casing having,a` shaftbearing extending out'- wardly from one end thereof and having at the same endA anannular inwardly-projecting hollowed boss having its cavity concentric with said' bearing; aj rotating member having aspindle journaled in said shaftbearing, and cutters journaled forfrotation in said rotating member between the end having the spindle and the opposite end thereof, the oppositeI end of the casing having a circular aperture through whichrsaid rotating member .and the cutters thereon may ybe entered bodily for. inserting thespindle in the spindle bearing to operating position, said rotating member having a circular head opposite the end having-thespindle which fits and closes said circular opening, the rotating'cutters being provided with means for engaging the hollowed boss for rotation of the cutters inthe rotating-mem- .ber when the latter is rotated in the casing,

jecting ,hollowed 'boss concentric with said bearing and forming a4 chamber about 'the inner end thereof; a rotating member having a spindle journaled in said shaft-bearing, and bearings for rotary cutters to be mounted for rotation both in andwith said rotary member, said rotary member having between the base -of the spindle and said cutter bearings a circular base which its and vcloses the inner 'end ofthe chamber formed by said hollowed boss.

In testimony-"whereof, I have hereunto set.

my hand at Chicago, Illinois,- this lstpday of July, 1914.

' JOHN K. STEVIART. Witnesses:

EDNA M. MAcIn'rosH, LUCY I STONE.4

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