US1770062A - Pencil sharpener - Google Patents

Description

July 8, 1930.

c. H. BLOMGRi EN 1,770,062

PENCIL SHARPENER Filed June 12, 1928 Cor/ ff BZamy/en Inventor A ltorney Patented July 8, 1930 CARL H. BLOMGBEN, OF SP OK ANE, WASHINGTON amen. snanrnnm Application filed June 1a, 1928. ilerial No. 284,855.

My present invention relates to an improved pencil sharpener designed especially for the purpose of sharpening the points of lead pencils having, a mechanical feed for the lead, but also adapted for sharpening the leads ofother kinds of pencilsand similar articles.

in carrying out my invention 1 utilize a stationary head having an annular or conical abrading face or surface around which the pencil. is revolved with its lead in frictional contact with the abrading' surface. A revolving pencil holder is used to carry the pencil and the pencil is maintained in rigid relation to the revolving holder as the penoil-lead frictionally engages the abrading surface.

-The primary object of my invention is the provision of a pencil sharpener of this type whereby the leads of mechanical-feed pencils may be sharpened without marring the point of the pencil case, which in many instances is fashioned from gold, silver, and other ornamental and valuable materials, and as is well known these parts are frequently marred when a file, knife or other abrading tool comes in contact with the pen cil case. 4

The invention consists in certain novel combinations and arrangements of parts as will hereinafter be more fully pointed out and claimed. In the accompanying drawings I have illustrated one complete example of the physical embodiment of my invention wherein 'the parts are combined and arranged according to the best mode I have so far devised for the practical application of the principles of my invention, but it will be understood that changes and alterations may be made therein within the scope of my appended claim without departing from the principles of the invention.

Figure 1 is a perspective viewof a pencil sharpener embodying my invention.

Figure 2 is a sectional detail view, at line 2-2 of Figure 1 showing a pencil in the holder for sharpening.

Figure 3-is a perspective view of the base or supporting block of the device.

Figure {l is a perspective tionary abrading head.

Figure 5 is a perspective view of the revolving pencil holder.

Figure 6 is a view of a pencil having a mechanical feed for its lead point, before sharpening, and Figure 7 is a view of the same pencil after sharpening its lead on the device of my invention;

The base or block 1 is preferably of cir cular shape and of suitable size and material, and when of suflicient weight may be used as a paper weight on the desk or table. A cushion or pad 2 of felt or similar material, is used on the bottom of the base to prevent marring the desk top when the device is used as a paper weight and to provide the necessary friction betweenthe base and its support when the sharpening device is being employed to sharpen the lead L of the pencil P.

in its upper face the block or base is fashioned with annular groove 3 that forms a pocket for the lead dust produced by abrasion, and in the center of the pocket 2. boss 4, of circular shape, is fashioned, said boss having a central screw hole 5 and a pair of spaced pin holes 6. The stationary abrading head 7 is provided with an annular or conical abrading surface or face 8 and the head, which is larger in diameter than the boss, is fixed thereto so that its lower edge projects beyond the edge of the boss and forms an overhanging, partial closure for the pocket to retain dust from abrasion, as well as providing a clear abrading surface for freedom of movement of the lead L, as it revolves about the head.

The head is affixed to the boss by the use of a screw 9 and a pair of dowel pins 10, the former threaded in the hole 5 and the latter forced into the pin holes 8 to provide a rigid, stationary head and abrading surface.

The pencil holder, which is revolvable about the head, comprises an arm 11 that is ournaled on a shoulder 12 beneath the head 13 of the screw 9, and at its outer, free end this arm has a socket head 1 in which a tapered bushing 15 is fixed. The bushing is preferably. of rubber or other similar .resilview of the staient, elastic material to form a cushion for the point P, of the pencil case, and possessing the necessary frictional qualities to clasp the tapered metal point of the pencil case. Thus, the pencil point P is pushed into the bushing, and due to the frictional qualities of the bushing material, the point is clasped or clamped without danger of marring the point P, and the pencil is held rigid with the pencil holder and against rotation on its own axis. The lead of the pencil projects through the bushing for frictional contact with the abrading face of the head, and one revolution of the pencil holder will cause an abrasion of the annular periphery of the lead. If necessary a second or third revolution may be given to the holder and pencil, and at the same time pressure is applied to the pencil to force the lead across the abrading surface of the head for the purpose of providing a sharp point to the lead.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is The combination with a stationary head having an annular abrading surface, of a revolvable pencil holder journaled in the head, a socket head on the holder, and a rubber bushing fixed within said socket head.

In testimony whereof I afiix my signature.

CARL H. BLOMGREN.

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