US1186951A - Pencil-sharpener. - Google Patents

Description

G. J. SENGBUSCH.

PENCIL SHARPENER.-

APPLlCATION FILED JULY' |912. 11,1 86,95 1 Patented June 13, 1916.

2 SHEETS-SHEET l.

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THE COLUMBIA PLANOGRAPH CD.. wAsmNoToN, D. C.

6.1. SENGBUSCH.

, PENCIL SHARPENEH.

APPLICATION men JULY-8. 1912.

1,186,951. 1 t PatendJune13,1916.

2 SHEETS-SHEET 2.V

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THE coLUM'BlA lfLMydGRAPH C0., WASHINGTON. D. C.

' construction and operation in a device of' GUsTavnJ. sENeBUscH, or MILWAUKEE, 'WisceNsINY lAssrGNeR To NEW ERA MFG.' co., OF NEW YORK, N. Y., A CORPORATION OF NEW' YORK.

PENCIL-SHARPENEB..

Liedern.l

My invention applies to that class of.

Sharpeners in which a cutting blade is reciprocated substantially longitudinally of the pencil in the sharpener, andV among the important objects ofthe invention areto provide a construction in which theknife will be automatically vlifted to clear the pencil at each back stroke to thus avoid the tendency of the knife to kdraw `the pencil out of the chuck during'the back strokes;4

to pro-vide a grinding wheel for the knife built in as a part of the Sharpener so that the knife can be ground; toV provide such arrangement that the knife will be brought up to and under the action of the grinding wheel at the end of each cutting stroke; to provide such arrangement for the grinding wheel and knife that the knife will be actedV upon by the wheel for a certain time afterl each cutting Stroke thereof; to provideim-V proved mechanism for effecting reciprocation of the knife blade supporting frame so that said frame is positively and accurately moved in either direction; to provide im'- proved ratchetanechanism for efectingstep by step rotation of the pencil; .and ingen eral to provide improved and. more eiicient the class referred to.

The device illustrated on the accompanying drawings embodies the various features of vmy invention andV in these drawings Figure 1 iS a side elevational view of' a Sharpener, Fig. 2 is a plan view thereof, Fig. 3 is a sectional view' taken from plane 3 3' of Fig. 2; Fig. lis a front end view of the knife bladek and its supporting frame, Fig. 5 is a plan View of the knife' supporting frame, and Fig. 6 shows the mounting of the grindingwheel on its 'supporting axle.

The supporting structure for the sharpener comprises a cup-shaped frame 1Q from;

whose sides extend the standards 11 and 12, and which has at its rear' end the diagonal extension 14E provided with a bore 15 for specification of Leiters Patint.

Patented June 1.3, 191e.

, Application filed July 8,1912. Serial No. 708,161.

I receiving a pencil tobe sharpened, thetopi` of the extension formingthe inclined guide Surface 16 for the cutting` blade 17. A' collar 18 supportedy across Vthe mouth ofthey borelsjournals a chuck 19 carrying Springl clips20,k forclamping they pencil insertedV throughthe chuck, the outer .flange of the chuckhavingratchet teeth 21 for coper-w ating Awith the ratchet pawls to be described i later. .The bore 15 terminates at its inner end atx'the opening 22 in fthe surface 16j through whichy opening.r the end of the pencil projects during the-sharpening op.- i

eration. Thelower end of the surface 16 leads to theinterior of the cup frame 10 to guide the Shavings thereto.' and a passagef4 way 23 leadsr from Opening 22 to carry the graphite cuttings to, `the cup.

. The extension lthas side plates 24' andy 25 secured theretowhich extend beyond the Surface 16k and at their upper edges are provided withinwardly,extending flanges or guide tongues 26 .and 27 parallel with the surface 16 and for receivingthe grooves 28 and 29 of the. block 30. This block has downwardly extending lugs 31 and 32 at its sides which support af shaft 33 ony which is hinged the knife Supporting frame 34. The construction of this knife Supporting frame iS .best sho-wn in Figs. i and '5, the frame having the dove-tailed channel 35-in its lower Vface forireceiving the blade 17. A

slot 36 extending a 'distance rearwardly from the front end of they frame,odivides the front end of thisv frame, and a clamping screw 37 passing through y'the part 3e andv threading into the part 34 serves to draw these parts together tov securely clamp the blade in adjusted position. f A compression spring 38 interposedl between the 'block30 and frame 3i tendsito hold the pointv of thc moved rearwardly, the front endv ofthe ratchetlever is released fromk the lug 32 and the front end of the Vlever is swung arm downwardly and when'the block 30 is `i y Y forward strokeV of the knife blade the .part l ,of the pencil*.projectingy above the surface Y 1 engagementwith another ratchet tooth. n

Y detent pawl 42 supported' from the plate 26 downwardly by the `41V and 'the Lchuck with the pencil therein is given a Vrotational advancement.y y Y kward stroke of the block 30fthe lug 32 en-` gages withthe front `end of the ratchet klever to raisethe outer end 40 thereof foAr locks thechuck in positionafter ladvancement by the ratchet lever. During each 16 is shaved off and the friction of the blade on the p'encilvwill ,keep the pencil Lend at the innerendof thefbore untilthe pencil Ilias @been sharpenedall the' way 'around Vto correspond with thefconical lsurface 15 of ythe' bore;

In order tov prevent the knife; fromdrawing out or (displacingk Ythe pencil during back strokesprovisionis made to raise the knife pointtovclear the pencilduring such back strokes. vrThe shank` v37"of screwl 37 has yat-its ends sl'ots v451r and 46 extending extends laterally cthrough the longitudinal `opening 43 in the side plate 24, and coperates with the cam plate 44.l` "This cam plate part-ly vertically, andl partly longitudinally `ofthe plate, screws 48 and49 threaded into theside plate 24 receiving these slots.

spring' 50 secured tothe camfplate and to thesidev-'plate 2.4tends vto Ahold the cam plate lit-s outer position with the lower ends ofits' slots in-fengz'igement with the screws 48,1and`49, as shown in full lines in Fig. 1.`j This is they position 'whenever the i @knife blade isfrat the end yofpitsforward stroke, the upper surfac'e4`4 of the fcam plate vextending intojthe lopening43 and into fthe' pathof the outward movement of s thev screw shank '37', the front end 44" of this surface l44 beingincludfed downwardly i .so that the knife blademay assume its lowermostr position. Thelouter end of the `cani I plate isfcut Vaway for a short distance to leave a shoulder 51 atthe outer end of the surface Als-the block 30 and with it. y'the knife `rframe' 34 fisl moved rearwardly the Vshank of screw37. will engage the inelinel 44 and' willi reach the surface ,514', the knife supporting frame `44 being thus swung I upwardly to raise the-.knife edge Y above the surface16 and above the pencil fpart projecting throughopening 22, and this raised position of theknife frame'is maintained until the screw 37 falls into the cut awaypart of the cam plate and behind theshoulder 51, the'knife edge then V being in engagement with surface 16 ready for the next cutting stroke.

As the knife supporting structure is now moved forwardly the screw: 37 will abut against' the shoulder lp-and will carry the vcam lplate44 forwardly a distance until` the bends of the slfotsk45 'and v46 reach the screws 48 and 49 Upon the for-V whereupon the screws 4S and 49 will receive the vertical ends of the slots and the cam plate willdrop so that its upper sur face 44"will be removed from t-he path of the screw shank 37 so that the blade edgek cam plate. As soon as the knife supporting Structure reaches the end of its forward stroke and the screw shank 37 has yleft the top of the cam plate, spring 5() will raise the cam plate and will shift it back'to lits normal position so that it will again form a rigid cam runway for t-he screw shank 37 during the next back stroke ofk the knife supporting structure. Thus during `re'ciprocation of the knife supportcally raised to clear the pencil during the back st-rokesand isy automatically brought into cutting posit-ion during the forward strokes.

Coming now to the mechanism for reciprocating the knife supporting structure, the standards 11 and 12 support at intermediate points the shaft 52 which between the standards is deflected to forni the crank loop` 53, the outer end of the shaft carrying the actuating'lever 54 provided with the handle 55. Supported between the upper ends of the standards 11 and 12 is a shaft 56 which pivots theswinging actuator plate 57. This actuator plate has the arcuate arms V58 and 59 between whose ends enters t-he lug 60 extending upwardly from the reciprocating block 30 of the knife supporting structure, this lug being engaged by the arm 58 to cause back strokes of the knife supporting structure, and is engaged by the arm 59 to cause the forward strokes as the cam plate 57 is swung forward and back. Extending through the arm 58 is a slot 61 whose inner and outer surfaces 62 and 63 forni cam surfaces for the yoke 53 of the crank loop 53, which yoke extends through the slot, 61. The slot 61'eXtends along the arc of a circle and when the plate 57 is in one position theslot 61 and the cam surfaces 62 and 63`will be concentric with the crank shaft so that the crank shaft 'may be rotated through the extent of the slot without causing movement of the actuator. plate or of the knife mechanism. As shown, the slot 61 is of substantially k180 degrees extent so that for each half revolution of the crank shaft the knifestructure willV be at rest and during the remaining revolution of the crank shaft the knife supporting `structure will be reciprocated. Describing ing structure, the knife edge is automatiposition indicated in dotted lines.

the operation more in detail, the ciankis rotated in vcounter-clock (Fig. 3). reaches the upper end of slot 61 it will. upon kfurther movement, engagev with the cam surface 62 to swing the actuator plate toward the left so that the knife support ing structure is moved outwardly to the After the actuator plate has been swung to its routermost position toward the left, the crank yoke will engage with the cam sur- 63 and the actuator plate will be swung toward the right and the knife supporting structure will be swung inwardly by the arm 59. At the end of such inward movement the slot 61 is concentric with the crank shaft and although the crank shaft con tinues to revolve there will be no further movement of the knife supporting structure until the crankyoke again reaches the outer endof slot 61, and the arcuate length of the slot determines the length of this vperiod of rest of the knife supporting structure.

Sharpening means are provided for acting on the knife blade during each of the intervals of rest of the knife supporting structure and as shown, such sharpening means comprises a grinding wheel 64 mounted on a shaft 65 journaled in the sides of a yokeframe 66 whose ends are pivoted on the crank shaft so that the yoke frame tol gether with the wheel may swing. The shaft 65 extends laterally through the elongated opening 67 in the standard 12 and at its outer end carries the pinion 68 which meshes with the gear 69 mounted on the crank shaft. Thus during rotation of the shaft the grinding wheel will be rotated and at the same time the wheel is free to swing bodily through a distance limited by the length of the opening 67. The wheel is p0- sitioned to engage with the knife blade end when the knife supporting structure is at the end of its forward stroke so that during the time that the crank yoke is coperating with the slot 61 the wheel will be grinding and sharpening the blade. When the knifbe is withdrawn the wheel will move downwardly and when the knife is moved forwardly it irst raises the grinding wheel so that during the grinding interval the weight'of the wheel and yoke will supply the necessary pressure to effect efficient grinding. Thus after each cutting stroke of the knife, the knife will be ground and thoroughly sharpened and during the sharpening period the knife supporting structure is rigidly held in place by the actuator cam which is locked against movement by the crank loop engaging in the slot 61 while said slot is concentric with the crank shaft.

I thus provide a very eiiicient pencil wise "directionv As soonas the crankyoke V53 Sharpener in which the knife issharpened during operation'of the cutter'and before or after each cutting operation, and in which the knife is prevented' from engaging with the pencil duringthe return strokes so that the pencil will not become displaced. rIlhe knife supporting structure is positively moved both forward'and back and is rigidly held duringfthe'timethat the knife is acted v upon by Vthe sharpening mechanism.

I do not, of course, desire to be limited to the exact construction and arrangement shown and described as modifications can be made which would still comevwithin the scopeV of the inventionV and I claim `thekfollowing:

1. In a pencil sharpening device, the comv bination cfa support foi" apencil, a cutting blade, asupporting structure for said blade reciprocable to effect cutting engagement of said bladewith said pencil,a crank shaft, means intervening betweensaid crank shaftv and knife blade supporting structure for causing reciprocation of said supporting structure during only part of each revolution of the crank shaft, said supporting structure being at rest during the remainder of each revolution of thecrank shaft, and sharpening means controlled by the rotation of said crank shaft to c'operate with the blade during such period of rest of the of said structure during only part of each revolution of said rotating member, said supporting structure being at rest .during the remainder of each revolution, and a sharpening member driven by said rotating member to sharpen the blade during such intervals of rest structure.

3. In a pencil sharpening device, the'combination of a supportV for pencils to be sharpened, a supporting structure recipro# cableon said supportandfcarrying a knife"VV blade, a crank pin, meansffor revolving said crank pin, a cam member interposed between said crank pin and supporting structure and having cam surfaces to be engaged by said crank pin to effect reciprocation of said structure during only part of each revolution of said crank pin, and grinding mecha-y nism cooperating with said blade during ofthe blade supporting the remainder of each revolution of said pin. a. In a pencil sharpening device, the comf bination of a support for pencils to rbe sharpened, a frame reciprocable on saidlsup-y port and carrying a knife blade, a crank pin to `the `cranklpin .and having a cam'slot for receiving Vsaid p1n,gsa1d cam slot being cony centric Withthe axis of revolution of said pinwhen said cam vmember is in one positiony 1Wherebyl said cammember Will remain stationaryy during engagementfof said crank y pin in "saidslot at such time, abutments on `10 said cam member Vcoperating with said frame toeffect reciprocation thereofas said cam member is `swung aftersaid crank pin .reachesthe'end yof said cam slot, and means for; grinding said blade during saidv period Whenthecam member, is stationary.

5. In a pencilsharpening device, the combination of a support for pencils to be sharpened, v'a frame reciprocable von said support and carrying la knife blade, a crank pin andvmean's for revolving/same, a swinging cam member havingabutments for coperating with' saidframe'to effect reciprocation thereof during swing of the cam member, means ,Connecting said cam member with said crank pin to effect swing-'of said cam member during only part of each revolution of said crank pin, and to hold it stationary during the remainder of the revolution, and

1 means forgrinding said blade When the cam member is at rest.

` 6. In -a pencil sharpeningdevice, the combination of a support Vfor pencils to be sharpened, a framefreciprocable on said support and carryingav knife blade, a crank pin and 'means for revolving samea swinging cam memberv havingfabutments for coperatingy With said frame to effect reciprocaktion thereof during swing Yof the cam member, means connecting said. cam member with said Vcrank pinto yeffect swing of said cam member during only partY of each revolution of said crank pin,and a continuously .rotating vgrinding Wheel engaged by the thepencilholder; a cutter mounted to recip- .Y Genies ofi-.this patent may be obtained for recate. in coperative relation to the pencil 1,186,951"V l Y holder.; actuating means mounted on the overhanging supports; and connections between the actuating means and the cutter and pencil holder for actuating the same; and a cutter YSharpener freely suspended on the overhanging supports and swinging into cooperative relation with the cutter, Whereby the latter may be sharpened at the end of its cutting stroke. f

8. In a pencil sharpening device, the combination of a support yfor pencils to be sharpened, avsupporting structure reciprocable on said support and carrying a knife blade, a crank shaft, cam mechanism connecting between said crank shaft and supporting structure for causing reciprocationl of said structure, a frame hung from said crank shaft, a grinding Wheel journaled in said frame, and means for causing engagement of said blade and Wheel after each cutting operation of said blade.

9. In a pencil sharpening device, the combination .of a support for pencils to be sharpened, a supporting structure reciprocable on said support and carrying a knife blade, a crank shaft, vcam mechanism connecting with said crank shaft and supporting structure and adapted upon rotation of said crank shaft to cause reciprocation of said structure to sharpen the pencil, a grinding Wheel having driven connection with said crank shaft and disposed to be engaged by thevknife blade at the end of each cut-y ting stroke and prior to the return stroke.

1,0. In aY pencil sharpening device, the

vcombination of a support for pencils to be sharpened, a reciprocating support carrying a'knife, means for reciprocating said support torcarry the knife back and forth over a pencil to be sharpened, a grinding Wheel operating in the path of movement of the knife and near the end of said path, and

means for actuating said Wheel, whereby the knife, as it nears the end of its cutting movement, engages said Wheel and issharpened thereby. n

vIn Witness. whereof, I hereunto subscribe my name,this 8rd day of July, A. I). 1912.

GUSTAVE J. SENGBUSCH. Witnesses i H. B. BERENDSEN, H. L. KLATT.

ve cents each, by addressing' the Commissioner of.Patents, Washington, D. C.

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