US1550245A - Pencil sharpener - Google Patents

Description

K DOUGAN PENCIL SHARPENER Filed Jan, 27, 1925 Aug. 18, 1925.

m m M Patented Aug. 18, 1925a PATE OFFICE.

OF MINNEAPOLIS, MINNESOTA, EXECUTOR OF THE SAID KENNEDY DO'UGAN, DE-

CEASED.

PENCIL SIL'JIARPEINERa Application led January 27, 1923. Serial No. 615,398.

l and State of Minnesota, have invented new and useful Improvements in a `ilencil Sharpener, of which the following is a specication.

@ne object of my invention is to provide :a Sharpener for lead pencils and the like that can be easily operated with one hand.

Another object is: to provide a pencil Sharpener that will sharpen a pencil when the device is given a reciprocal motion,

Another object is to provide in a pencil ISharpener having a cutting edge means for causing the rotation of the cutting edge through the reciprocating mot-ion of the device. Y

Another object is to provide means fer transforming the reciprocating to a rotating motion with the minimum amount of friction.

Another object is to provide an improved form of grip for the pencil.

lllith these and incidental objects in view, the invention consists of certain novel features of construction and combinations of parts, the essential elements of which are hereinafter described with reference to the drawing which accompanies and forms a part of this specification.

In the drawing, Figure 1 is a side elevation of my device shown attached to the under part of a table.

Figure 2 is a fragmentary sectional view taken on a longitudinal axis.

Figure 3 is a section taken on the line 3M-3, Figure 2.

Figure 4L is a top view of the device, Figure 5 is a section taken on the line 5--5 Figure 4.

As shown, the pencil Sharpener consists of a body l in which is mounted a rotatable head 2 carrying a cutting knife 3. Extendingl from this head 2 is a spirally twisted metal strap 4 which forms a double threaded screw.

The bracket 5 has mounted on the depending feet 6 grooved anti-friction rollers 7 set at an angle to readily receive the edges 8 of the screw thread.

A pencil may be inserted into the head as shown at 9 and the body is slotted at lO to allow it to grip the pencil.

The pencil positioned in the head is gripped by the hand with the thumb or linger or both holding the external part of the body l and also the pan l1, then when the hand is moved bach and forth horizontally the screw will be rapidly turned by the reaction of the rollers: 7, thereby causing the head 2 with the cutting edge 3 to rotate in the body l, thus sharpening the pencil in the customary manner.

The pan ll snaps over the body encircling the barrel thereof as plainly shown at l2 in Figures l and 5 and receives the turnings from the pencil and may be readily detached and emptied when it becomes full.

The ordinary type of pencil Sharpener requires the use of two hands so the advantage to` a draftsman, or anyone steadily working at a bench or table in being able to sharpen a pencil with one hand only is easily recognized by anyone who has ever engaged in this line of work.

`While I have described my invention and illustrated it in one particular design, l do not wish it to be understood that l limit myself to this construction as it is evident the application of the invention may be varied in many ways within the scope of the following claims:

l. In a pencil sharpener, the combination of a body adapted to receive and grip the pencil therein with a cutter head rotatably mounted in said body, a mounting frame for the device and means connecting said head and said frame for translating al reciprocating motion applied to said body into a rotative movement of said head.

2. In a pencil Sharpener, the combination of a frame with grooved pulleys mounted on said frame, a screw co-acting with said pnlleys whereby a reciprocating1 movement of said screw rotates said screw and a cuttin edge, rotatable by said screw.

3. In a pencil Sharpener, the combination with a body, of a cutter head rotatably mounted in said body, a cutting edge carried by said head, a screw extending from said cutter head, a vmounting frame, and antifriction grooved rollers co-acting in nutlike fashion with said screw.

KENNEDY DOUGAN.

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