US2523663A - Pencil sharpener - Google Patents

Description

2 Sheets-Sheet 1 Filed Oct. 17, 1945 ATTORNEYS M W. 5 M

Sept. 26, 1950 J. s. MILNE PENCIL SHARPENER 2 Sheets-Sheet 2 Filed Oct. 17, 1945 Uvvmroe JOHN 5 M/LNE A770/P/VEY5 Patented Sept. 26, 1.950

PENCIL SHARPENER Johns. Milne Chicagml llnassignpr to Sears,

Roebuck and 60., New'York Chicago, 111., a corporation of Application qctc ber 17, iai'slseriaiivo. 622,971

The present. invention relates to pencil sharp- I I.

eners and is more particularly concerned" with certain improvements in pencil sharpener design and apparatus for affording thev attainment of a streamline, esthetic product which includes ad- 7 justment for pencil diameter variations and severability for chafi discharge; V

V The principal object of the present invention is the attainment of a pencil sharpener structure whose outer contours are gracefully streamlined after the manner of aeronautic teardrop design and yet in which is incorporated all of the mechanical advantages and structural details of adjustability, efficiency in performance and economy of manufacture,

Pencil sharpeners customarily are provided with a system of rotatable cylinder cutters con tained within a housing that provides a reservo'ir for the retention of cuttings or'cha'ff subject to periodic cleanout or disposal. In addition, this class of apparatus in order to have universal adaptability, must be provided with aperture adjustment so as to appropriately receive and secure various conventional diameters of pencil structures'toward the end of achievingmoreiefficient and concentrica1ly accurate cutting operations. Heretofore known -rnechanisins in which these functionally desirable features have been incorporated possessed considerable irregularity of outline orcontour so as to la cking from an esthetic orartistic viewpoin @The manner in whichthe desired structure'sare designed in the present embodiment contributes" toward the attainment or a streamlining of the overall struc ture whereby there is achieved higher standards of esthetic beauty and pleasing symmetry.

For a more comprehensive understanding of the present invention, reference will now be had to the accompanying drawings and to the following detailed specification in which like references designate corresponding parts throughout and in which: I

Fig. 1 is a perspective view of a mechanical pencil sharpening apparatus showing the symmetry and esthetic lines of the outer structure such as is afforded by virtue of the mechanical features embodied in the present invention,

Fig. 2 is a side elevation view partially in section of the apparatus featured in Fig. l'revealing the interior structure,

Fig. 3 is a plan View of the same apparatus having portions broken away in order to reveal interior features of the construction, and

Fig. 4 is a transverse sectional View taken ap-' proximately on the line 44 of Fig. 2.

Fig. 5 is a sectional view taken approximately on line 5-5 of Fig. 2.

The reference numeral II indicates generally a pedestal'casting'the foot 12 of which is gracefully curved and filleted with the integral vertical post [3, as best indicated in Figs. 1 and 2. With the latter there is integrally associated at its uppermost. extremity a journal ring l4, the outer lines of which form part of the bullet nose or streamline conformation completed in the adjacent threaded collar. l5 of the. crank arm Hi. The

. journal or bearing ring M is centrally apertured as at l to receive the principal or bearing portion of a shaft f8 which is confined endwise beturning of the assembly with minimum endwise tween the abutment of its enlarged diameter head [9' and the limit collar I5. i in reduced diameter of shaft I8 is threaded as at 22 into the collar l5 so that when the latter is drawn taut, its shoulder 2| engaging the adjacent end surfaces of the bearing portion l8, adequate clearance will be afforded for the easy shoulder 2| of the threaded play or clearance. The rotor, which is integral with the head {9, includes a convention cage cast 7 ing comprising the for-e portion 23 having a con- I centric openingzlarge enough to receive the maxi mum diameter of pencil and the pair of supporting flanges 24 and 25 Within which are received the ends of the cuttershafts after the manner of conventional structure of this class of apparatus. The two shafts converge toward the rotor axis and-are threaded into the head 19" giving support each to an associated one of a 'pair'of cutters'26 and 21. i

The latter elements are preferably of a cylindrical mill cutter type having spirally fluted cut ting edges and integrally formed with beveled gear elements 2B'and 29 spaced from each other but meshing with an internally toothed gear ring 3| which may be milled of flat stock material and secured to the forward face 32 of the bearing.

ring I4. Upon rotation of the manual knob 33 and the arm IS, the entire assembly including the rotor cage '23, shaft [8 and threaded arm nut 15 will revolve customarily in a counter-clockwise direction, as viewed in Fig. 4, and through the engagement of the bevel gears 28 and 29 with optionally at 90 therefrom in the case of wall or vertical surface mounting of the pedestal l I. Toward this end the shoulder 35 may have a pair of peripheral notches 58 and 69 and the=fitting ring 3'! may have a lug 6'! insertable endwise into alter-n native ones of said notches, see Fig. 5. After the end ring 31 is placed upon the shoulder or undercut 35 and the internally toothed gear ring 3| is positioned and secured, the hood 36 may not beremoved inadvertently and the'entire assembly including the hood 36 will form an integral association. The hood 36 which overlies the rotor assembly continues the outer streamline sym metry described above in connection with bush ing or sleeve I4 and nut and describes substantially 180 of barrel shapedcontour terminating at horizontal extremities in the curved edges 4|, of which one is visible in Fig.1 and another in Fig.3, While just beneath these edges 41 the hood is provided with groovedguide flanges including the protruding lips 42 and the groove recess 43, Fig. 1.

The forward face of the hood 36 is molded so as to present three alternative notches designated 44, 45 and 46 into one or another of which there may be received a detent embossment 4'I, Fig. 4, of an escutcheon lever..48'which is pivotally supported at 49 on a shoulder screw, 5| threaded into the body of the receptacle casting 52. The ,es. cutcheon lever 48 includes an arcuate segment 53 having three openings designated 54, 55 and.

50 of different diameters each-for receiving an appropriate one of three conventional pencil sizes when thelever 48 is characteristically placed, Fig. 4, in corresponding position, which position is detentably retained by the engagement of the ridge embossment47 within one of the notches 44, 45 or 46. I r vThe receptacle casting 52 affords a chamber 6| for catching and retaining pencil shavings as they fall from the cutter elements '26 and 21 and its sidewalls 62 are provided with-guide-lips 63 tion 66 may be hollowed out in those regions where rigidity and strength are otherwise adequate.

While the present invention has been explained and described with reference to a particular structural embodiment, it is to be understood nevertheless that various modifications and variations may be instituted without departing from the essential spirit or scope thereof. Accordingly, it is not intended to be limited to the particulars of the foregoing detailed specification, nor to the illustrations in the accompanying drawings, but rather to be permitted a realm of construction as indicated by the hereunto appended claim.

The invention claimed is:

A pencil sharpener assembly of the rotatable milling-cutter class comprising a pedestal castmg formed with a journal for affording bearing support :tov the shaft of a milling-cutter cage and a foremost shouldered portion affording a ring with a shaft rotatable in said pedestal journal,

and a shavings receptacle comprisinga unitary housing contoured to supplement and continue the curvatures of said hood and having :lips receivable in said guide grooves of said hood, said receptacle including a solid foremost section provided with a cylindrical aperture to receive and support pencils directed to the milling cutters of said cage.

' JOHN S. MILNE.

REFERENCES CITED 5 The following references are of record in the file of this patent:

1 UNITED STATES PATENTS Number Name Date 1,285,528 Wilson Nov. 19, 1918 1,305,855 Wilson June 3, 1919 1,393,378 Johnson Oct. 11, 1921 1,609,538 Cronan Dec. 7, 1926 1,810,284 Luppert June 16, 1931 2,094,549 Miller Sept. 28, 1937 2,251,058 Hoffmann July 29, 1941 2,287,247 Hoffmann June 23, 1942

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