US838289A - Manufacture of cutters for pencil and like sharpeners. - Google Patents

Description

No. 838,289. PATENTED DEG. 11 1906.

- K. WEBER.

MANUFACTURE OF GUTTERS FOR PENCIL AND LIKE SHARPENERS.

APPQIOATION FILED DEO.22.1905.'

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KARL TRAUGOTT WEBER, OF KOSWIG, GERMANY.

Specification of Letters Patent.

Patented Dec. 11, 1906.

Applicatioii filed December 22,1905. Serial No. 292,986.

To all whom it may concern.-

Be it known that vI, KARL TRAUGOTT WVEBER, a subject of the King of Saxony, residing at Koswig, Saxony, German Empire, have invented a certain new and useful Improved Manufacture of Cutters for Pencil and Like Sharpeners, of which the following is a specification.

This invention relates to the manufacture of cutters intended for sharpening slatepencils, lead-pencils, and the like, whereby a simple and cheap manufacture of suitable cutter-blades is effected.

According to this invention I first produce in a strip of sufficiently hard and strong material, preferably steel plate, a number of oblique cutters parallel to each other, but not yet in their final oblique position. Then the cutters are ground parallel to the common plane of the cutting edges, which can be done very conveniently and cheaply. As the sharpened portions as long as they are parallel to the common cutting-edge plane do not form good cutting edges, they are further twisted or inclined into the desired final oblique positionthat is to say, until they form an angle with the common plane of the cutting edges, whereby excellent cutting edges are produced. The advan tages of this method lie in the simplicity with which it can be carried out and which makes it possible to avoid having to sharpen each cutting edge to the proper angle.

Tools prepared according to this invention can be of various shapes; but they are all distinguished by simplicityof construction and use and by being very suitable for their purpose and hi hly efiicient.

The application of the method according to this invention to the manufacture of various forms of cutter-strips will be now described with reference to Figures 1 to 15 of the accompanying drawings, wherein- Figs. 1, 2, and 3 show, respectively, a side view, an end elevation, and a plan of one form of cutter. Figs. t-and 5 show, respectively, a plan and front elevation of part of a blade-strip. A second construction specially adapted for sharpening lead pencils is shown in Figs. 6, 7, 8, and 9, Fig. 6 showing a longitudinal section on the line 6 6 of Fig. 7, which is a front elevation, while Figs. 8 and 9 show plan views of the whole pencilsharpener and of the blade, respectively. Figs. 10 and 11 are vertical longitudinal sections through a strip with double cutters on a large scale and serve for explaining the process of manufacture. Figs. 12, 13, 14, and 15 show views of the stages of manufacture of another form of cutter.

Referring to Figs. 1 to 5, out of the strip A, Fig. 4, which is made, say, of steel plate, are stamped projections or tongues a, by twisting which relatively to the plane of the strip a series of oblique cutters are produced parallel to each other in such manner that the tongues project freely from the back of the cutter-strip. Then all the cutting edges of these cutters are ground simultaneously parallel to the common plane of the cutting edges. By further twisting the cutter-strips the cutting edges are brought into the desired final oblique position, in order to form in that position properly acting cutting edges, the ground surfaces retreating from the common plane of the edges.

If the device is to be used for sharpening slate-pencils or chalks, it is not necessary to grind the cutters, provided the strip is of sufficiently thin material.

By securing two comb shaped cutterstrips A and A, formed as described, between two bars B or in a suitable frame forming a grooved holder ,and by causing the tongues a to intermesh with each other with their free ends at an angle a very efficacious sharpener will be produced, in the groove of which the pencil will be drawn to and fro.

In the construction of cutter-strip shown in Figs. 6 to 11, Figs. 10 and 11, respectively, illustrate the position of the tongues before and after the grinding operation.

By the method according to this invention tongues a are stamped out from a metal strip A in such manner that they form crossbars when placed in the frame-body, the ends of the bars remaining attached to the side parts of the strip. The blades a are twisted about the side parts,which remain in the original plane, as about an axis, so that they project both upward and downward from the plane of the strip. There is formed a series of cutters on each side of the sheet-metal strip.

Between the tongues or cutters a is an interval or space through which the shavings can fall. The tongues a are at first turned to a smaller extent than required for bringing them into their final position. Compare Fig. 10 with Fig. 11, which latter shows the final position of the tongues. When turned in the position of the tongues in Fig. 10, the

edges of the tongues are ground parallel to the plane of the strip in the direction of the arrows shown in that figure, which can be done very easily and cheaply. The sharpened portions are then, however, parallel to the plane of the strip and would not be of much use as cutting edges; but if the tongues are then twisted into their final position, Fig. 11, the sharpened portions form an angle with the plane of the strip and very suitable and eificient cutting edges are pro duced. In this way it is not necessary to grind every cutting edge separately to the proper angle.

In the modified construction of cutterstrips shown in Figs. 12 to 15 the cutterstrip A is cut out in such manner as to produce bridges or cross-strips a separated by intervals. Then the strip itself is bent into a zigzag shape, so that the bars a are oblique to the former plane of the strip and parallel to each. other, but arenot yet in their final position. Then in accordance with the method according to this invention the bars or bridges are ground at their cutting edges parallel to the common plane of the cutting edges. In order to obtain efficient cutting edges, the strip is then further bent by pushing the strip together longitudinally,whereby the zigzag structure is reduced and deepened in such manner that the cross-bars or bridges come into the desired final oblique position that is to say, that the cutting-faces form an angle with the longitudinal plane of the strip.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The method of manufacturing cutterstrips for pencil-sharpenersgand the like, consisting in providing a strip of metal with a series of oblique cutters parallel to each other and integral with the strip but not yet in their final oblique position, grinding the cutting edges of the said cutters parallel to the common cutting plane, and finally further inclining the cutters in such manner as to bring them into the desired final oblique position, so that the cutting-surfaces are at an angle to the common cutting plane.

2. The method of manufacturing cutterstrips for pencil-sharpeners and the like, consisting in forming from a fiat sheet-metal strip tongues in such manner that they project from the central plane of the strip, bend- I ing the stamped-out tongues relatively to the plane of the strip-body in such manner that they are in oblique position thereto and parallel to each other, but not yet in their final position, the oblique tongues projecting from the cutter-strip body, grinding the cutting edges of the tongues parallel to the common plane of the cutting edges, and, finally, in further twisting the tongues so that the cutting-faces are at an angle to the common cutting plane.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

KARL TRAUGOTT WEBER.

Witnesses OTTO VVOLFF, RICHARD IPFERTE.

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