Патент USA US2106963код для вставки
1, 1938. a M, L“ ULLMAN _ PENCIL SHARPENER Filed June 12, 1935 . an’? ‘ 2,106,963 Patented Feb. 1, 1938 ' _ 2,106,96ii UNITED STATES PATENT OFFICE 2,106,963 PENCIL SHARPENER Morris L. Ullman, Milton, Mass.‘ Application June 12, 1935, Serial No. 26,203 1 Claim. (Cl. 120—93) This invention relates generally to pencil sharp ening devices, and particularly to devices of the character wherein provision is made for effecting the retention, in and by such devices, of the 5. wood shavings and the ?nely divided graphite pared from pencils in the use thereof. The primary object of my invention is to pro vide a pencil sharpener in the use of which the wood shavings pared from pencils are compacted, 10 and, by virtue of becomingcornpacted, are ef fectively retained by the pencil sharpener during the pencil sharpening operation. The secondary object of my invention is to provide such a pencil sharpener from which such compacted 15 masses of wood shavings, together with the ac cumulations of ?nely divided graphite, can be discharged in a very simple manner. These and other objects of my invention, which will readily occur to those skilled in the art, are realized in 20 the device illustrated in the accompanying draw ing wherein: Fig. 1 is a side elevation, partly in detail, of the pencil sharpener. ~ Fig. 2 is a sectional view of the pencil sharp 25 ener in use, the section being taken along the line 2, 2 of Fig. 4, showing the manner of accu mulation of the wood shavings and of the ?nely divided graphite during the pencil sharpening, operation. 30 Fig. 3 is a plan view, partly in detail, of the ?tting snugly to the front and sides thereof, and of a conformation adapted to accomplish pur poses hereinafter to be set forth: the speci?c embodiment of the present invention may be particularly described as follows: The body l of the pencil sharpener, composed of any suitable material such as synthetic resins, is provided with a longitudinally disposed cham ber forthe reception of the ends of pencils to be sharpened. This chamber consists of the se 10 quence of the U shapedcylindrical space 2, the truncated conical space 3, and the truncated cylindrical space i, extending throughout the entire length of the body I. A rectangular slot 5 in the top of the body I communicates with 15 this chamber. Inset into the top of. the body 5, with its edge overlapping one edge of the slot '5, and held ?xed in position by‘ the screw '3, is the paring blade 6 whose edge projects slightly into the U shaped cylindrical space 2 and the trun cated conical space 3. The cover 8, composed of sheet metal in the shape shown, having turned down flanges ‘for sides and front and a top struck up into a conico-cylindrical surface, is pivoted upon the body I near its rear end by 2 means of the pivots 9 rotating in cavities of the body !. The cover, when in position, ?ts snugly to the front and sides of the body l, thus pro viding a chamber for the reception of the wood shavings and ?nely divided graphite pared from pencil sharpener, showing the arrangement of pencils during the pencil sharpening operation, the paring blade in relation to the body of the and forestalling the escape of any wood shavings or ?nely divided graphite ‘by way of the front end or the sides of the pencil sharpener. Par ticular attention is called to the fact that when the cover 8 is in position, the rear end Ill of the conical surface of the cover is positioned considerably forward of the rear end of the edge of the paring blade 6. A device of the character described, occupying a volume of approximately one cubic inch, and therefore readily portable, may be manufactured cheaply and sold at a popular price: despite its pencil sharpener, and to the pencil receiving chamber thereof: the lateral cavities in the body of the pencil sharpener for the reception of the 35 pivots of the cover are also shown. Fig. 4 is a rear elevation, partly in detail, of the pencil sharpener, showing the relationship of the edge of the paring blade to the longitudinally 40 vertical plane‘ of symmetry of the chamber for the reception of the wood shavings and ?nely divided graphite pared from pencils during the pencil sharpening operation, and showing also the mode of pivoting the cover upon the body of 45 the pencil sharpener. Fig. 5 is a front elevation of the pencil sharp ener. Fig. 6 is a plan view of the pencil sharpener. Fig, 7 is a side elevation of the pencil sharp 50 ener with the cover rotated to permit the dis charge of a compacted mass of wood shavings and an accumulation of ?nely divided graphite. As shown by these illustrations, the present in vention comprises broadly a pencil sharpener, 55 provided with a cover pivoted thereupon, and great simplicity, it is highly satisfactory and ef fective for all purposes for which it is intended; and its use is attended with cleanliness to a de gree attainable only in a costly non-portable device. In the use of this pencil sharpener, the novel advantages of my invention are readily perceived. As the pencil is rotated in a clockwise manner in the pencil sharpener, wood shavings and ?nely divided graphite accumulate in the manner shown in Fig. 2 at l2 and [3, respectively. The rate of accumulation of wood shavings at any 55 2 2,106,968 point along the edge of the paring blade 6 is proportional to the diameter of the conical plane of symmetry of the chamber is preserved: thus, for example, if the edge of the paring blade chamber 4 at that particular point, so that the rate of accumulation of wood shavings at the rear extremity II of the paring blade 6 will always be greater than the rate of accumulation of wood shavings at points forward of the point 6 is positioned at the mid point of the width of the body I, shifting of the conico-cylindrical sur I I. In actual practice, I have found that, in the sharpening of a pencil, the amount of wood 10 shavings accumulating in the region forward of face of the cover is required to reestablish the proper relationship between the edge of the par ing blade 6 and the chamber for the reception of the wood shavings and ?nely divided graphite. The compacting e?Eect thus realizable by the construction herein shown and described im 10 the point 10 will just ?ll the space provided, but the amount of wood shavings accumulating in parts to my pencil sharpener several novel ad vantages. First, the wood shavings and ?nely. the region back of the point III will become packed Y‘ divided graphite produced in the pencil sharpen tightly in the space provided, as is shown at I2 in Fig. 2. In consequence, the wood shavings so compacted form a plug which is ?rmly re tained in position, thus preventing the escape of any wood shavings or ?nely divided graphite by way of the rear end of the pencil sharpener, even ing operation are retained by and in the pencil sharpener in the simplest possible manner; sec 15 ond, the possibility of escape of Wood shavings and ?nely divided graphite during the pencil sharpening operation is eliminated; and, third, the compacted wood shavings are discharged in when the pencil sharpener is held vertically. a more or less integral mass when the pencil 20 The wood shavings so compacted can be dis lodged .from the chamber by way of the rear sharpener is emptied. end only with di?lculty, but the pencil sharpener can, of course, be emptied very readily by rotat~ 25 ing the cover 8 upon its pivots 9 and allowing the compacted wood shavings and the ?nely divided graphite to fall from the pencil sharpener. That this compacting e?ect actually occurs became apparent to me in the course of experiments made upon such a pencil sharpener, the cover of which was pivoted near the front end of the body I: in these experiments, the accumulating wood shavings invariably displaced the cover from the body in a rotational manner. Thus I 35 was lead to realize that. were the cover pivoted near the rear end of the body I, the compacting of the wood shavings would cause them to be retained within the chamber.v . In subsequent ex periments made upon pencil Sharpeners, the 40 covers of which were pivoted near the rear ends of their bodies, I found that superior compacting e?ects could be realized in a clockwise operable pencil sharpener when the edge of the paring blade is positioned, as shown, to the left of the longitudinally vertical plane of symmetry of the chamber for the reception of the wood shavings and ?nely divided graphite: in a pencil sharp ener so constructed, the compacting of the wood shavings proceeded uniformly throughout the width of the chamber. Such uniform compacting e?eot can, of course, be realized in any construc tion wherein such relationship of the edge of the paring blade 6 to the longitudinally vertical While the preferred embodiment of vmy inven tion has been shown and described, my inven tion comprises all devices employing the same principles for the accomplishment of the same 25 or similar results; and the appended claim is to be construed as broadly as possible in view of the prior art. Having thus described ‘my invention, WhatI claim is: r In a pencil sharpener, the combination of a body provided with a longitudinally disposed pencil receiving chamber, blade means parallel to and intrusive into the pencil receiving cham ber, and a snugly ?tting cover sheathing the 35:. said body save at its rear end and bottom and pivoted upon the said body near the mouth of the pencil receiving chamber, the said cover forming with the said body a conico-cylindrical chamber the end of which nearer the mouth of the pencil receiving chamber is open and the area of whose vertical cross-section perpendicu lar to the length of the blade means is substan- - tially proportional to the corresponding vertical cross section of the pencil receiving chamber 45 throughout the length of the conical portion of the said chamber but of lesser proportionality throughout the cylindrical portion of the said chamber, and the said cover being rotatably dis placeable from the top of the said body in a 5,0 : direction perpendicular to the plane of the top of the said body. ~ MORRIS L. ULLMAN.