US1223541A - Pencil-sharpening machine. - Google Patents

Description

E. P. WEBSTER. PENCIL SHARPENING MACHINE. APPLICATION FILED FEB. 21. 19M.

Patented Apr. 24, 1917.

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176% m a I 46 1mm as WITNESSES: IN IZEyOR 197 @AWOR/VEY E. P. WEBSTER. PENCIL SHARPENING MACHINE. APPLlCATlON FILED FEB. 21. 19M- l,223,541. Patented Apr. 24,1917.

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WITNESSES: I INVENTOR wa fi ir 64; M QW gm i; ATTORNEY EDGAR P. WEBSTER, OF BRIDGEPOR'I, CONNECTICUT.

PENCIL-SHARPENING MACHINE.

Specification of Letters Patent. Patented Apr, 24, 191?.

Application filed February 21, 1914. Serial No. 820,107.

To all whom it may concern Be it known that I, EDGAR RNVEBSTER, a

citizen of the United States, residing at Bridgeport, in the county of F airfield and State of Connecticut, have invented certain new and useful Improvements in Pencil- Sharpening Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to pencil sharpening machines and it consists in certain details of construction to be more fully set forth in the following specification.

Referring to the drawings wherein the same figures of reference indicate like parts throughout the several views:

Figure 1 represents a side elevation of the machine frame;

Fig. 2 is a front elevation of the frame;

Fig. 3 is a side elevation of the machine showing the cutter carrying levers partially depressed, and broken view of the standard;

Fig. 4 is an upper plan view of the machine;

Fig. 5 is a detail view of the actuating lever for the pencil holding mechanism or chuck;

Fig. 6 is a detail broken outer View of one of the cutter carrying levers;

Fig. 7 is a detail end elevation of the cut ter carrying lever shown in Fig. 6, looking in the direction of arrow a,

Fig. 8 is a detail front elevation of the radial guide for the cutter carrying levers;

Fig. 9 is a detail side elevation of the radial guide;

Fig. 10 is a detail upper plan View of the radial guide;

Fig. 11 is a detail elevation of the pencil holding chuck;

Fig. 12 is an enlarged detail upper plan view of the pencil holding chuck;

Fig. 13 is an enlarged detail plan view of the washer for actuating the gripping fingers of the pencil holding chuck;

Fig. 14 is an enlarged detail of the gripping fingers and the wire on which they are strung; and

Fig. 15 is an enlarged detail side elevation of one of the gripping fingers.

Fig. 16 is an enlarged front elevation of the machine showing the cutter carrying levers partially depressed, and a section of the handle operating lever on line 16 of Fig. 4.

The machine frame comprises the base 1, standard 2 and head 3. 4, Fig. 4, is a short shaft journaled in the bearing 5, Fig. 1, and the flattened ends 6, Fig. 3, are embraced by the forked ends of the cutter carrying levers 7 and 8. Pins 9 and 10 project through the levers and projecting ends of the shaft 4, thus forming a universal joint for the levers, In other Words, the levers will not only have a radial movement with the shaft to which they are connected, but they Will also have a certain lateral movement on the pins 9 and 10 to conform to the concave sides 3 of the head 3, Figs. 1 and 2. To the tail-piece of the pin 10 is secured the retractile spring 11, Fig. 3, adapted to return the levers 7 and S to their normal elevated position.

The levers 7 and 8 carry the cutters 12 and 13 seated in recesses 14 formed in their outer faces. The cutters are made of thin metal and are secured to the levers by clamps 15, Figs. 3 and 16. The cutting ends of the cutters are slightly concave to conform to the concave surfaces of the head of the frame.

The guide 16 is attached to the end of the head 3 by screws 17. This guide has the inwardly turned flanges 18, Figs. 3, 9 and 10, to serve as lateral guides for the cutter carrying levers, as follows: On the ends of each of said levers are the curved raised portions 19, Figs. 3, 6 and 7, adapted to ride against the inside face of these flanges and thus cause the cutters to follow the contour of the concave sides of the head by reason of the convex form of these flanges.

The hollow pencil holding chuck, Fig. 11, comprises the toothed collar 20 adapted to be secured to the reduced portion 21 of the head by the screw 22. This collar loosely embraces the reduced body portion 23 of the chuck to permit said body, and the parts connected therewith, to freely rotate therein.

24 is a plate secured to the body and having the peripheral teeth 25 adapted to be engaged by the upper end of the lever 26, Fig. 5, presently to be more fully described, and the teeth 27 depending from the underside of the plate adapted to engage the teeth of the collar 20 to prevent a reverse movement of the rotatable part of the chuck and also to serve as means for elevating said rotatable part, presently to be more fully described. The spring 28, located between the shoulder 29 of the body and the inside shouldered portion of the collar 20, serves to keep the teeth 27 and the teeth in the upper surface of said collar in normal engagement with each other.

Within the hollow shoulder 29 is located the wire 30, Figs. 12 and 14, on Which are journaled the pairs of pencil holding fingers '31 operating within the slots 32 in the lower part 33 of the body portion of the chuck. 34 is an actuating washer for the gripping fingers having the projections 35 adapted to project through the slots 32 and bear against the underside of the gripping fingers to maintain their central position within the body of the chuck through the medium'of the spring 36. 37 is a cap adapted to hold said spring in place.

The pencil 36, Fig. 3, is first passed through the chuck expanding the gripping fingers against the tension of the spring 36,

Fig. 11, and resting on the ledge 38-see also Fig. 1. The cutter carrying levers are then depressed by means of the handle portion '39 of lever 8 to bring the cutters into cutting engagement with the end of the pencil. The lever 26, Fig. 5, is journaled on the body of the screw 40, Figs. 1 and 4, with itsupper end 41 in engagement with the peripheral teeth of the plate 24, with its lip 41 overhanging the cutter carrying lever 8 and is actuated by the latter lever in its upward movement to partially turn the pencil holding chuck in the direction of arrow Z), Fig. 4. This partial rotation of the chuck will cause the incline portion of the depending teeth 27 of the plate 24 to ride up the incline portion of the teeth 42 of the collar 20 and thus lift and turn the chuck at the same time and thus present a fresh cutting surface for the cutters on the neXt downward stroke of the levers 7 and 8. This raising and turning of the pencil holding chuck at the completion of each cutting strokeis important in view of the fact that there is no possibility of the pencil becoming wedged in the opening 43 of the head. As soon as the depending teeth of the plate 24 has passed the teeth of the collar 20, the body of the chuck will be depressed by the before mentioned spring 28, Fig. 11, and the depending teeth of said plate and collar will re' e'ngage to prevent a reverse movement of the chuck body.

The concavity of the sides of the head 3 gradually decreases toward the lower end of said head and leaves said lower end practically straight, and of a width adapted to represent the diameter of the lead portion of the pencil. In other words, as fast as the wooden portion of the pencil is cut away,

said pencil will move down the opening 43,

until the lead 44 rests on the bottom of the scent of the pencil, the wooden portion will be gradually tapered, and the lead, instead of being brought to a needle point, as is the case with all pencil sharpeners, so far as known, the lead will be practically straight, and will have a blunt instead of a needle point. On the downward stroke of the cutter carrying levers, the underside of lever 8 will engage the edge 46, Fig. 5, of the chuck actuating lever 26 and throw the upper end of the said chuck actuating lever out of contact with the toothed plate 24 in readiness to be reengaged by the upper edge of lever 8 to rotate the chuck in the manner as before described.

Having thus described my invention, what I claim is:

1. A pencil sharpening device having a head provided with oppositely located concave surfaces merging into straight surfaces toward the lower end of the head, the distance between said straight surface being equal to the proposed diameter of the lead of the pencil, an opening in the head to receive the pencil, an oscillating shaft, cutter carrying levers mounted on the shaft and oscillating therewith and also having a lateral movement thereon, and a stationary guide engaged by said levers for maintaining the cutters in the path of said concave and straight surfaces. I

2. A pencil sharpening device having a, head provided with oppositely located concave and straight surfaces, said head having an opening, a pencil holding chuck rotatably mounted therein, v a transverse opening through the concave and straight surfaces and having a seat therein for supporting the end of a pencil, oscillatory cutter carrying levers, and a stationary guide engaged by said levers to positively maintain the cutters in the path of said concave and straight surfaces.

3. A pencil sharpening device having a head provided with oppositely located concave and straight surfaces, an opening in the head, a pencil holding chuck rotatably mounted therein, an oscillating shaft, cutter carrying levers mounted on the shaft and oscillating therewith and also having a lateral movement thereon, a stationary guide engaged by the levers to positively maintain the cutters in the path of said concave and straight surfaces, and means for rotating and elevating the pencil holding chuck on the upward movement of the levers.

4. A pencil sharpening device comprising a frame provided with concave surfaces and an opening to receive a pencil, oscillatory cutter carrying levers, a guide for maintaining the cutter carrying parts of the levers against said concave surfaces, a pencil holding chuck rotatably mounted in the pencil 10 of the cutter carrying levers to slightly r0- tate the chuck and cause the same to be temporarily lifted on the up stroke of the cutter carrying levers.

In testimony whereof I aflix my signature in presence of two Witnesses.

EDGAR P. WEBSTER.

Witnesses GEORGE N. SEARS, FREDK H. BECKWITH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, I). G.

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