US2017696A

US2017696A - Stylus for making sound records

Info

Publication number: US2017696A
Application number: US637961A
Authority: US
Inventors: Hesse Walther
Original assignee: Individual
Current assignee: Individual
Priority date: 1931-10-29
Filing date: 1932-10-15
Publication date: 1935-10-15
Anticipated expiration: 1952-10-15

Description

Oct. 15, 1935. w. HESSE STYLUS FOR MAKING SOUNb RECORDS Filed Oct. 15, 1932 d bi 17;. fly. I2 fig /4 Q Q l fly- 22 19:92 25,

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6 WHLTf/Ef? f/sssz QTTOEA/[SY w a a 6 E C H Z I. a a a K G Patented Oct. 15, 1935 UNITED STATES PATENT} OFFICE s'rrLUs Fon MAKING SOUND nnconns Walther Hesse, Aachen, Germany Application October 15, lcsa'seriai N... 637,961 In Germany October 29, 1931 3 Claims.

two cutting edges of said cutting point portion forming with each other an angle of substanti'ally 90.

The invention will appear more clearly from the following detailed description when taken together with the accompanying drawing showing preferred embodiments of the inventive idea.

In the drawing:

Figure 1 shows in side elevation a'stylus of the type used in prior art.

Figure 2 is a bottom plan view of the stylus shown in Figure 1.

Figure 3 shows in front elevation another stylus of the type used in prior art.

Figure 4 is a bottom plan view of the stylus shown in Figure 3.

Figure 5 is a front elevational view of a different stylus known in prior art.

. Figure 6 shows in front elevation a stylus made in accordance with the principles of the present invention.

Figure 7 shows in side elevation the stylus illustrated in Figured Figure 8 is a back view of the stylus illustrated in Figure 6.

Figure 9 is a section along the line A--B of Figilre '1. a Figures 10, 11 and 12 are front view, side view and back view, respectively, of a difierent stylus. Figure 13 is a section along the line C-D of Figure 11.

Figures 14, 15 and 16 are front view, side view and back view, respectively, of another stylus. Figure 17 is a section along the line E-'F of Figure 15. r

Figures 18, 19 and 20 are front view, side view and back view, respectively, of a different stylus.

Figure 21 is a section along the line G-H of Figure 19.

. I6 Figure 23.

.the stylus in the holder.

The point of the known styluses of this kind forms, as shown in elevation and bottom plan views in Figs. 1 to 4 a three-sided or four-sided pyramid. Styluses are also known which, as

shown in Fig. 3, are formed by an equilateral triangular cutting plate bevelled at the edges on both sides, which plate is detachahly connected to the shank of the stylus by a screw. As in the known styluses with pyramidic point" the base I of the point corresponds to the cross section of 10 the shank, these styluses are not very rigid. The

same applies to the styluses with a triangular cutting plate flxed-on the shank by screws, especially as this plate is relatively thin and its intersecting cutting edges form an angle of only These 15 known styluses consequently vibrate considerably when cutting sound grooves in records of hard material, such as hard rubber and metal, and cut and tear chips from the record. The sound records cut in hard record plates'by meansof 20 these known styluses are consequently not sharp and clean so that disturbing secondary noises and considerable distortion of tone occur when such records are played. These objections are over- I come by employing the styluses according to the 25 invention.

The invention consists substantially in that the point worked from the material of the circular or non-circular shank is wider at its base than the shank of the stylus. When'cutting sound grooves even in hard records by means of the stylus according to the invention, all detrimental vibrating of thestylus is avoided, owing to the special shaping of its point, and consequently a very clean cut is produced because a continuous chip is cut from the record.- Records produced with this stylus therefore give a reproduction without disturbing secondary noises and distortion of tone. Moreover, by the shape of the point of the shaft, convenient flat gripping sur- 40 faces are produced thereon, which facilitate the correct insertion of the stylus into the holder of the sound box, which is very important for making records. Owing to the flat shape of the point the new stylus also presents the advantage, that 45 it can be provided by means .ofcolour or in some other manner with clearly visible markings onits point to further facilitate the proper fitting of The bevelled lateral edges cf the point of the 50 stylus preferablyform an angle of about A stylus constructed in this manner produces a particularly clean cut.

Experiments have shown that it is particularly advantageous to: the point to have either'a flat c5 surface both on its front side and also on its rear points of the different styluses.

side, or a flat surface on one side and a recessed surface on the other side.

Five embodiments of the invention are illustrated by way of example in Figs.-6 to 25 of the accompanyin drawing.

In all five forms of construction a point a, 12 having chisel-shaped edges is worked from a shank c, which point is wider at its base than the shank c so that the point projects beyond the shank on each side. The two cutting edges a and b of the point form an angle of approximately and are undercutground or bevelled from the front towards the rear. The examples illustrated differ chiefly only as regards the shape of the surfaces on the front and rear sides of the In the construction shown in Figs. 6 to 9 the point of the stylus has flat surfaces d and e on its front and rear sides, which surfaces are slightly inclined relative. to the longitudinal axis of the shank c. 1

In the construction illustrated in Figs. 10 to 13 the point of the stylus only has a flat surface a slightly inclined to the longitudinal axis of .the

shank c on its rear side, whereas on its front side .it is provided with a hollow surface f, which is formed by two surfaces inclined towards one another to form an obtuse angle.

In the form of construction according to Figs.

14 to 17 the point has on its front side, a flat surshank and on its rear side a hollow surface corresponding to an imaginary cylinder, the longitudinal axis of which is parallel to the longitudinal axis of the shank.

The stylus illustrated in Figs. 22 to 25 has on its 5 front side a flat surface m slightly inclined to the longitudinal axis of the shank, and on its rear side a recessed surface n corresponding to a portion of the surface of an imaginary ball.

I claim:'-. v 10 l. A stylus for making sound records, comprising a shank having a cutting point and cutting side edges with flattened and converging front and rear faces, said cutting side edges being formed by an upwardly and rearwardly bevelled 15 end of the stylus, forming a blunt V-shaped cutting edge, the stylus at the end of said bevels being laterally enlarged.

2. A stylus for making sound records, comprising a shank'having a cutting point and cutting 20 side edges with flattened and converging front and rear faces, said cutting side edges being formed by an upwardly and rearwardly bevelled end of the stylus, forming a blunt v-shaped cutting edge, the stylus at the end of said bevels 25 being laterally enlarged, the converging rear face being inwardly and outwardly curved.

3. A stylus for making sound records, comprising a shank having a cutting point and cutting side edges with flattened and converging front and rear faces, 'said .cutting side edges being formed by an upwardly and rearwardly bevelled end of the stylus, forming a. blunt V-shaped cutting-edge, the stylus at the end of said bevels being laterally enlarged, said flattened front face 35,

having a lower portion which extends outwardly away from said rear face.

WALTHER HESSE.