US1058168A - Pencil-sharpener. - Google Patents

Description

J. H. FASSETT. PENCIL SHARPENER. APPLICATION FILED MAR.18, 1910.

2 SHBETS-SHEET 1.

COLUMBIA PLANOCIHAPH CO..WASHINOTON. D. C.

Patented Apr. 8, 1913.

J. H. FASSETT. PENCIL SHARPENER. APPLICATION FILED MAR.18, 1910.

Patented Apr. 8, 1913.

2 SHEETS-SHEET 2.

COLUMBIA PLANOGRAPH :0, WASHINGTON. D. c

JAMES I-IJ FA SSETT, F. NASHIIA, NEW "HAMPSHIRE.

' 'PENCIL-SHARPENER.

"Specification ofjLetters'Patent.

' 'PatentedApr; 8,1913.

Application filedTMarch 18,4910. :Se-rial N0*.'55 0,1194- Tozall whom it may concern 'IBe'it' known that. 1,; JAMEsnH. :Fassn'r'r,

a citizen of the United: States, :residing at Nashua, in the county (of l'Hillsborora-nd- State of' New i Hampshire, 1 "have invented icertain new I and :useful improvements :in TIBGIIGll Sharpeners, iofwhich'.-.the:following specification, reference beings had Ito-the ac} company-Trig drawings. I

=My invention :relates to improvements in pencil-sharpeners sand: 1 particularly. to c improvements tin pencllis'harpeners in which I I the pencil is rotated while ipressed. against a rotatingor whirling abrasive device; and

fan obj ect of umy:1nvention is to; provide. a

pencil-sharpener 10f -theichamcter ust: described lin iwhich the -lead ofthe pencil will be preserved fromecraclcing: and breaking and only sufficient of. the pencilwill be-Jworn I aw ay to give to 'the pencilithe requiredp oint.

1 Another obj ect of my invention :isrtonprovide a pencil-sharpener "with a pencil-holding device which will hold the pencil firmly and which will at thesameltime be' yielding enough to'receive pencils of varying diameters.

- A third object of my vide a pencil-sharpener in whichwthe pressure acting to force -the pencilagainst the abrasive disk may be finely-adjusted.

Other features of my invention willbe set forth in the description and claims' which gr pping fingers s of the spht tube 1* a band fOllOW. g

In the drawings illustrating the-principle of my invention and the best mode now known to me of applying that principle,

Figure 1 is an elevation of my new pencllsharpener; Flg. 2 is a plan of the same; Fig. 3 is a section on the line A-A of Fig. 1; Fig. 4 is a detail in section showing the manner in which the pencil is held against the abrasive surface of the disk; and Fig. 5 is a detail of the pencil-holding device, the rubber band being shown in section.

The housing or casing a is open in front and at its bottom is provided with holes through which may be passed screws 6 to fasten the casing to the top of a suitable support, as a shelf, desk or table. In the lower part of the casing a is slidably fitted a drawer c in which is collected the material abraded from the pencil. The walls of the housing are so formed as to insure that this material will be collected in the drawer c. From the back wall d of the housing projects a boss or stud c which is hollow and posed between; the

invention is to proin whichisjournaledithe 'shaft fiupon the outer end of which is mountedfast-a pinion g. andupon the inner end eofwhichiis :formed I integral ea .diskiJz.

rend ofztheshaft filSiL thumb-screw c' which passes 5 through ;a:.ciroul=ar-platemj ,and the a Screwed into the "inner disk is of abrasive material, which is interplate: jzzandw-the disk h. Projecting fromz'thetbaclewall' daof the hous- .;i ng =is a iseoond .stud :or: :boss maformed' with an .interiorlyihreaded :sorewedthe threaded-tend iof' a screw 01, which serves as anla-Xis ofarotation oria stationary shaft for: thegspur' gear r0. ixThe lattermeshes with :andgdrivesfthepinion g,shaft if, disk It flandithe. abrasive material is held thereon .by the plate :and athumb=screw a. ;-For ned I in- :tegral with. the zsp'url-lgear .0 :lS asrsmaller socket: into which -.is

bevel-gear .p which @meshes with and 1 drives the bevel gear 9 mou'nted-on a' split :tube 1" the,.inner end 'of: wl1ichvis :slit-t'edaso as to form. a number "'Ofa gripping: pfingers .s. I Aroundv 'the- 2 latter @is mounted a rubber band 6.

l Ithas heretofore been. found difiicult. to provide a pencil holding clutchthat would hold the pencil firmly and not allow itto-be .pushedwbackqby the :abradant. and which would atthe same time be sufliciently yielding to receivejpencils varying. inqdiameter as n do the pencils commonly found on the market. By combining wi t h..-the. resilient tflof .ielding material, I have produced a penci -holding device which is yielding enough to fit pencils having different diameters and which will nevertheless hold the different pencils with a grip so firm that none will suffer displacement by the rotatingdisk or abradant. The split'tube r is journaled in bearings formed in the side of the casing and in a bracket-arm a formed integral therewith.

In the top of the casing there is formed a hole 4; through which projects inwardly and downwardly a tang 10 formed on the end of a leaf spring a: the other end of which is formed with a slot y. Through the latter passes a stop-screw a. For purposes of ad justment of the tang w, the leaf spring w is pivotally mounted on the tap-screw z. The tang 'w is semicircular in cross-section as is shown in Fig. l; and this shape allows the pencil to be easily pushed between the tang and the abradant disk is. The tang w serves to hold the end of the pencil against the latter with a yielding pressure and by adjusting the leaf spring as, the length of the bevel formed on the end of the pencil may be Varied.

As is best shown in Fig. 3, the circular plate 7' is slightly dished or concaved at its center, whereby a springiness is conferred upon the plate and the pressure With which the contacting rim portion 7" bears upon the abradant 74 may be varied by turning the thumb-screw 2'.

Integral with the spur gear 0 is cast the crank-arm 2 to which is fastened the knob 3 and by which the spur gear 0 is turned, thereby rotating the shaft 9 and the splittube 1'.

The operation of the device is too obvious to need further description.

In a recess d in the back wall (Z at the base of the stud 6 there is mounted a coil spring h which bears against the abradantcarrying disk it near the junction of the latter with the shaft f. This spring h maintains the abradant disk is pressed against the pencil with a yielding pressure which, assisted by the spring action of the tang w, tends to prevent breakage of the point of the pencil and to adapt the sharpener to receive pencils of diflerent sizes.

As is clearly shown in Figs. 1, 2 and l, the parts are so arranged that the end of the pencil to be sharpened is held tangent to a circle concentric with the shaft f, that is, the center of which lies in the axis of the latter and, further, that the same end is held in a vertical plane passing through that axis. By thus positioning the pencil-end to be sharpened, it is insured that the sharpening of the pencil will be accomplished with the least wearing away of the graphite consistent with the giving to the pencil a satisfactory point.

claim:

1. In a pencil-sharpener, a casing, rotatable pencil-holding means journaled in said casing, pencil-sharpening means also journaled in said casing, and means yieldingly and adjustably engageable with the pencil for holding the end thereof to be sharpened against said sharpening means, comprising: a slotted leaf-spring pivoted to said casing, leaf-spring clamping-means carried by said casing and projecting through said leafspring slot, and a tang carried by said leafspring and engageable with the pencil, toward the end thereof to be sharpened.

2. In a pencil-sharpener, a casing, rotatable pencil-holding means journaled in said casing, pencil-sharpening means also journaled in said casing, and means yieldingly and adjustably engageable with the pencil for holding the end thereof to be sharpened against said sharpening means, comprising: a slotted leaf-spring pivoted to said casing, leaf-spring clamping-means carried by said casing and projecting through said leafspring slot, and a tang, arcuate-shaped in cross section, carried by said leaf-spring and engageable with the pencil, toward the end thereof to be sharpened.

In testimony whereof I hereunto set my hand at Nashua, New Hampshire, this 16th day of March, 1910, in the presence of the two undersigned witnesses.

JAMES H. FASSETT.

WVitnesses:

CLARA M. SMITH, F RED L. CLARK.

Copies of this patent may be obtained for five cents each, by'addressing' the Commissioner of Patents,

Washington, D. G.

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