US1029801A - Pencil-sharpener. - Google Patents

Description

A. D. FISHER.

PENCIL SHAEPENER.

APPLIoATIoN FILED JULY s, 1909.

Patented June 18, 1912.

,W W @5W/wy@ 1 l AHORA/Ba cuLUMBlA PLANDGRAPH 0., WASHINGTON. n. c.

ALEXANDER D. FISHER, OF TORONTO, ONTARIO, CANADA.

PENCIL-SHARPENER.

Specification of Letters Patent.

Patented J une 18, 1912.

Application filed July 8, 1909. Serial No. 506,613. u

To aZZ 'whom t may concern Be it known that I, ALEXANDER D.- FISHER, of the city of Toronto, in the Province of Ontario, Canada, have invented certain new and useful Improvements in Pencil-Sharpeners, of which the following is a specification.

This invention relates to pencil sharpeners of the type in which the pencil is held in a recessed holder and sharpened by a sliding cutter, and my object is to devise a Sharpener of this type which will be efficient, cheap, light, compact and easily operated without soiling the fingers.

I attain my object by the constructions hereinafter specifically described.

Figure l is a plan view of my improved pencil Sharpener. Fig. 2 is a longitudinal vertical section showing the tightener bar in the position it assumes to free the cutter from its working position. Fig. is asimilar view showing the t-ightener bar moved to hold the cutter down to its working position. Fig. 4 is a side elevation of the Sharpener partly broken away to show means for holding the cutter in position. Fig. 5 is a cross-section through the pencil holder showing the slide in front elevation. Fig. 6 is a cross-section of the slide. Fig. 7 is a cross section showing a modification of Y the cutter clamp and cutter adjustment.

In the drawings like letters of reference yindicate corresponding parts in the different figures.

A is the pencil holder formed of a substantially rectangular bar having a suitably shaped recess B formed therein to receive the pencil in such a manner as to exposev its end partly through the upper surface of the holder in position to be acted on by the cutter as hereinafter described. Owing to the inner end of the recess being conical a tapered opening is formed in the upper side of the pencil holder and to prevent the breaking of the point of the lead during sharpening I form a slight enlargement a at the end of this tapered opening. The forward edge of this enlargement forms a stop against which the point of the lead will abut to limit the forward feed of the pencil after. the latter has been sufficiently sharpened.

On the holder A the slide C is longitudinally movable. This slide it will be seen embraces the pencil holder its upper part being formed partly by the seat D for the cutter, and forward of that by the ribs q.

The cutter E is formed of a small circular knife having a stud b projecting from its upper surface. The upper surface of the seat D 1s inclined as shown particularly in Figs. 2, 3 and t to present the edge of the clamp F which has a hole formed therein to fit over the stud b when the parts are in the position shown in Figs. 1, 2 and 3.

Thisclamp is formed of spring metal so that it may be sprung tightly down on top of the cutter and its forward end engaged beneath the swinging lock bar G which is pivoted at al at one side of the slide and is adapted to engage in notch e at the opposite side. p When the clamp is held beneath this lock bar the cutter will be securely held in place on the seat. When the clamp is thrown back as shown in Fig. 4 the cutter is readily removed for replacement. It will be noted that the stud Z) is provided with a slot for a screw driver. The cutter may thus be readily turned whenever desired to present a fresh cutting edge for action. Gage marks are preferably provided, on the clamp F, as shown in Fig. l, to aid in the adjustment of the cutter, and a coperating index mark is formed on the head of the stud Z).

To secure effective action it is important that the cutter be held closely down to its work during the cutting stroke and that it be allowed tovlift from its work during the return stroke in order that the pencil may be turned during the return stroke to present a fresh surface to be cut. If no such provision is made the knife will drag back over the work which not only spoils the cutting edge but is apt to break the point of the lead. I avoid this result by the mechanism I will now describe.

Between the under side' of the slide and the under side of the pencil holder is located a tightener bar H. This is preferably carried by the pencil holder. This tightener bar is provided with the projections f having inclined rear edges. Similarly shaped projections g are formed on the underside Aof the holder A. The tightener bar may thus assume either the position shown in Fig. 2 or when shifted endwise the position shown in Fig. 3. Whenin the latter position the slide C is held down with the cutter in proper position for work. When the tightener bar is in the position shown in Fig. 2 the slide is loose and may be drawn back and lifted yover the work as already described without damage to the cutter or the point ofthe pencil.

The longitudinal mo-vement is imparted to the tightener bar in the following manner. A lug I is formed at the rear end of the tightener bar and a lug J is detachably secured to the forward end of the tightener bar. This lug J is made detachable to aid in the assembling of the device. The bottom of the slide itV will be seen is in position to engage these lugs I and J. Assuming a pencil to be inserted in the holder while the parts are in the position shown in Fig.-2 the slide C is drawn back unt-il it engages the lug I when the tightener bar is drawn to the position shown in Fig. 3. The cutting stroke is now made the forward movement continuing until the slide has strucl; the lug J and caused the tightener bar to assume the position shown in Fig. 2. The slide is thus freed to loosen the cutter from its work ready for the return stroke during which the pencil may be turned as already described.

I find it necessary to provide the tightener bar with spring means tending to retain it either in the position shown in Fig. 2 or Fig. 3. `For this purpose I secure in a suitable recess in the'under side of the pencilholder A the bent spring K. One end L is bent into a U, as shown in Figs. 2 and 3, and is held in the corner of the recess by a pin The free end of the spring extends substantially parallel to the axis of the holder and is bent back upon itself as shown, the end y' passing through a loose hole formedon the lug is formed on the tightener bar I-I. This spring tends to hold the tightener bar in either of the positions shown without interfering with the longitudinal movements of the bar. The lug la by abutting on the ends of the notch Z serves to limit the longitudinal movements of the tightener bar. l

I find in practice that owing to the antifriction properties of graphite that the knife will sometimes slightly spring up over the lead point instead of cutting it down level with the cut in the wood. The unyielding knife seat then passing on over the point will break it. To avoid this I slightly cut away or groove the knife seat behind the working edge of the cutter to afford a space into which the lead may spring after thecutter has passed by, as shown particularly'at m in Figs. 2, 3,4 and 6.l It will be noted that Vthe forward end of the cutter clamp F is extended diagonally forward and upward to the lock bar Gr. This upwardly inclined portion L forms a chip guard to prevent chips and graphite flying back to contact with the lingers gripping. the movable slide. The upwardly extended sides n of the slide form side guards to aid in securing the desired result. The chips and powdered graphite are pushed forward by the chip guards into a chip recess IVI formed near the front end of the pencil holder. From this recess they may be tipped into any suitable receptacle after the sharpening operation is finished.

To give the end of the holder a secure grip on any surface without marring the sur face I provide the end of the holder with a rubber vacuumcup N suitably secured thereto. The end pressure of a pencil when placed in position in the holder will securely hold this vacuum cup against any suitable surface while the slide is being reciprocated. In order that the slide may be easily gripped and operated I preferably curve the sides longitudinally and linurl or otherwise roughen them as shown particularly in Figs. 1 and 4. I may also provide the slide with a handle-0 secured to its under side to suit those who may vnot find the holder convenient to operate by grasping its sides. For some purposes it may be convenient to secure the holder permanently to some vertical surface. I therefore provide the attaching lug P which may be secured to the end of the holder in place of the vacuum cup N.

yTo enable the cutter to be set for a line or a coarse cut I preferably provide the following means. A lug Q, is formed on the cutter clamp F through which is threaded the adjusting screw R which engages the rear side of the stud b of the cutter E. The hole in the cutter clamp through which the stud passes is made slightly oblong, as shown particularly in Fig..1, hence by adjusting the screw R the cutter Amay be pressed forward down its seat to give any depth of cut desired within the limits of adjustment provided. A

In Fig. 1 I show a modification of the cutter clamp. Lugs o are inwardly extended from the parts n of the side and the forward end of the cutter clamp F is inserted beneath them. The rearward end of the clamp is bent down to form a flange p. Through a hole in the flange is passed a screw S which screws into the back of the cutter seat D. The stud b will fit closely in the hole in vclamp F so that by adjusting the screw S the cutter may be adjusted on its seat. The cutter clamp, as in the form previously, must be sprung down on the cutter before it can be secured, thus tightly holding down the cutter. In each form of clamp shown it will be seen t-hat there is a hinge arrangement at one end, free in one case and pinned in t-he other, and a releasable fastening means at the other.

I nd that a pencil Sharpener constructed in accordance with my invention will quickly and easily sharpen a pencil Without breaking the lead. By the use of suitable die casting processes and sheet metal stampings the device may be cheaply and accurately made. By the use of the rotatable cutter ofthe size shown at least 24 different Working edges may be consecutively brought into position for use, and when one cutter is completely dulled all around its Working edge it is readily replaceable by another. These cutters being small may be turned out at a price making the cost of renewal a mere trifle.

What I claim as my invention is z- 1. In a pencil sharpener the combination of a pencil holder; a slide mo-vable longitudinally on said holder and also movableto and from its Working position; a cutter carried by said slide; and means for holding the slide down to its Working position during the cutting stroke; and means for free ing it at the end of said stroke.

2. In a pencil Sharpener the combination of a pencil holder; a slide movable longitudinally on said holder and also movable to and from its Working position; a cutter carried by said slide; and a tightener bar adapted to be automatically moved at the end of the return stroke of the slide to hold the slide down to its Working position and at the end of the cutting` stroke to release it automatically romsaid Working position.

8. In a pencil Sharpener the combination of a pencil holder; a slide movable longitudinally on said holder and also movable to and from its Working position; a cutter carried by said slide; and a tightener bar movable by the slide at the end of its return stroke to hold the slide down to its Working position and at the end of the cutting stroke. to release it from said Working position.

4f. In a pencil Sharpener the combination of a pencil holder; a slide movable longitudinally on said holder and also movable to and from its Working position; a cutter carried by said slide; a tightener bar movable by the slide at the end of its return stroke to hold the slide dovvn to its working position at the end of the cutting' stroke to release it from said Working position; and a spring tending to hold the 'said bar in its slide releasing` position.

5. In a pencil Sharpener the combination of a pencil holder; a slide movable iongitudinally on said holder and also movable to and from its Working position; a cutter carried by said slide; a tightener bar longitudinally movable; and means for moving said bar to and from the holder comprising inclined planes formed on the pencil holder and said bar respectively.

6. In a pencil Sharpener the combination of a pencil holder; a Slide movable longitudinally on said holder and also movable to and from its Working position; a cutter carried by said slide; a tightener bar longitudinally movable; means for moving said bar to and from the holder comprising inclined planes formed on the pencil holder and said bar respectively; a spring secured to the holder having an arm extended substantially parallel to the axis of the holder and bent back upon itself; and a lug on the bar having a hole therein through which the free end of the spring passes.

7. In a pencil Sharpener the combination of a pencil holder; a slide movable longitudinally on said holder and also movable to and from its Working position; a cutter carried by said slide; a tightener bar longitudinally movable; means for moving said bar to and from the holder comprising inclined planes formed on the pencil holder and said bar respectively; and stops limiting the longitudinal movements of the bar on the holder.

8. In a pencil Sharpener the combination of a pencil holder; a slide movable longitudinally on said holder and also movable to and. from its Working position; a cutter carried by said slide; a tightener bar adapted to be automatically moved at the end of the return stroke of the slide to hold the slide dovvn to its Working position and at the end of the cutting stroke to release it automatically from said Working position; a spring secured to the holder having an arm extended substantially parallel to the axis of the holder and bent back upon itself; and a lug on the bar having a hole therein through Which the free end of the spring passes.

9. In a pencil Sharpener the combination of a pencil holder; a slide movable longitudinally on said holder; a rotatable cutter; a seat for said cutter formed on the slide; a cutter clamp having a swinging engagement With the slide at one end; releasable means for holding down the other end of the clamp; a central stud on the cutter the clamp being provided With an oblong hole to receive said stud; a lug on said clamp; and an adjusting screw threaded through said lug and engaging the stud.

10. The combination of a pencil holder; a slide longitudinally movable on the holder; a rotatable cutter; a cutter clamp having a hol-e therein; and a stud on the cutter passing through said hole gage and index marks being formed around the hole and on the stud.

11. In a pencil Sharpener the combination of a pencil holder; a slide movable longitudinally on said holder and also movable to and from its Working position; a cutter car- `part longitudinal movement to the tightenei' ried by Said slide; a. tightener bar longitnbar, one of saidlugs being detachable. dinally Inova-ble; means for moving said Toionto7 this 2nd day of July, 1909.

barkto and from the holder comprising in- ALEXANDER D. FISHER. @lined planes formed on the pencil holder Signed in the presence of# and said bar respectively; and lugs with A. CAMPBELL,

which the slide is adapted to engage to imo F. W. MOKENDRICK.

Copies of this patent mai7 be obtained for ve cents each, by addressing the Commissioner of Patents,

' Washington, D. C.

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