US1478795A - Needle or style for gramophones and like machines - Google Patents

Description

Dec; 25, 1923. EAT/8,795

K. H. PERKINS NEEDLE OR STYLE FOR GRAMOPHONES AND LIKE MACHINES Filed July 15, 1922 i atenied Dec. 25 1923.

Parr rare.

KENNETH HAROLD PERKINS, F BEJDITCH, ENGLAND.

Application filed July 13, 1922. serial No. 574,601.

To all whom it may concern:

Be. it known that I, KENNETH Harrow PERKINS, subject of the King of Great Britain, and residing at The CedarsflAsta wood Bank, Redditch, England, have invented certain new and useful Improvements in Needles or Styles for .Gramophones and like Machines, of which the following is a specification.

This invention refers to an improyed needle or style for gramophones and the like, and has for its object to provide a single needle or style bearing two blades or points of difi'erent lengths, so that the same needle I may be employed for producin either loud or soft tones as require By this means there is a considerable saving in manufacturing expense as only one set of discs is required while the life of at each needle in use is considerably prolonged.

My invention essentially. comprises a needle or style for a gramophone or like machine in which a stem or shank carries a pair of flattened blades set atan angle thereto, the blades bein of different lengths,

and preferably of di erent'thickness, and terminating in points which lie on opposite sides of the axial line of the stem or shank. B turning the needle through a half so revo ution .in the holder on the reproducer eitherpoint may be caused to engage the sound record or groove on the record disc, and flats are preferably formed on opposite sides of the stem or shank, the flats being adapted to be engaged by the clamping screw which secures the needle in the holder to ensure the needle being correctly placed therein.

Any other suitable means may be provided 40 for this purpose, as for example, the stem or shank or the needle may be of square or other an lar cross-section.

The b ades are preferably of a thickness substantially equal to the width of the sound as record or groove on the record disc so that they-may be a working fit therein and do not foul the sides ofthe groove. The needle me. thus be used repeatedly without apprecia 1e wear either of the needle or record, so and the objectionable sibilant noise caused by the contact of a round pointed needle with the sides of the groove is eliminated.

One preferred embodiment of my invention is illustrated in the accompanying drawings in which-- Figure 1, is a side elevation on an enlarged scale of the lower portion of a needle.

Flgurc 2, is an end elevation of Fig 1.

Figure 3, is a sectional plan on the lines 3-3 of Fig. l.

In the drawing a is the cylindrical stem or shank of the needle having flattened portions 5, a, on opposite sides of its periphery, and (Z, c, are the flattened blades. The needle is preferably made from steel wire or like material, and the flattened blades may be formed by stamping, pressing, grinding, or milling. v

The shaping of the blades may be eii'ected by trimming or shearing either in the same tools or in a subsequent operation, and the plane of the blades may coincide with the axis of the stem, or may coincide with one side face of the stem as shown in Fig. 2.-

The latter construction is preferred as a better tone is obtained with a needle of this construction in use.

' By turning the needle within the holder on the reproducer either of the blades or points d, 6, may be caused to engage the record disc, and as the point e is longer and more resilient than thepoint d, the point 6 will give a. soft tone, while'the point d will give a loud tone.

A shown in Fig. 2, the blades are extremely thin in a direction at right angles to the sound record or groove on the record disc, their thickness being substantially equal to the width of the groove so 'that they may be a smooth working fit therein. 7

If desired the blade 6 for soft tones may be made of slightly less thickness than the blade d to give greater resilience, convenient thicknesses of the two blades being, for example, five thousandths and eight thousandths of an inch respectively.

I claim 1. A needle or style for gramophones and the like comprising a shank part having a pair of pointed blades at one end set at an angle thereto.

2. A needle or style for gramophones and the like, comprising a shank part having at one end a pair of flattened blades each set at an angle to the hank, said blades being of difierent lengths and terminatin in points whieh lie on opposite sides 0 the axial line of the shank.

3. A needle or style for gramopho'nes and 6 the like, coinprisin a shank part, flats on opgosite sides of said shank part, a flattened en to said shank part, said end bein formed into two pointed blades of different lengths each set at an angle to the shank art. p 4. 'A needle or stylefor gramophones'and the like; comprisin a shank part, means on said shank for ena ling it to be secured in the needle holder of a machine in either of two positions, a pair of flattened blades at one end of the shank part, the plane of saidv blades being approximately coincident with one side of the shank part, eachof said blades terminating in a. point and being set at an angle to the shank. T:

5. A needle or style for gramophones or the like comprising a shank with a flattened portionat one end formed into two blades of different thicknesses.

pointed 6. A needle or style for gramophones or it the like comprising a shank with a flattened end formed nto two pointed blades of different lengths each set at an angle to the shank part.

In testimony whereof I afiix my signature.

KENNETH HAROLD PERKINS.

Images