US1657627A - Sound-recording and sound-reproducing instrument - Google Patents

Description

Jan. 31, 1928. 1,657,627

F. KAY ET AL SOUND RECORDING AND SOUND REPRODUCING INSTRUMENT Filed May 24, 1924 Patented Jan. 31., 1928 UNITED STATES 1,657,627 PATENT OFFICE.

FRED KAY AND WILLIAM ERNEST CLIFTON, OF LONDON, ENGLAND, ASSIGNORS TO CLIFTOPHONE LIMITED, 01? LONDON, ENGLAND, A'BRITISI-I COMPANY.

SOUND-RECORDING AND SOUND-BEPRODUCING INSTRUMENT.

, Application filed May 24, 1924, Serial No. 715,606, and in Great Britain May 31, 1923.

This invention consists in improvements in or relating to sound-recording and soundreproducing instruments and has for its object to provide an improved mounting for a stylus-bar operating in conjunction with a diaphragm.

Sound-recording or sound-reproducing instruments of the type contemplated by the present invention are well known in their use for example with talking machines and consist broadly in a vibratory diaphragm held within a casing in which the stylusbar is mounted with one of its ends connected to the diaphragm and the other end formed with or constructed to receive a stylus or needle.

According to one feature of the present invention means. for mounting a stylus-bar comprises at least two spring blades each of which will be operatively connected at its opposite ends respectively to the sound-box casing and to the stylus-bar with one of the blades arranged in or substantially parallel to a plane containing the stylusaxis, characterized by the other blade being so operatively connected to the stylus bar and to the sound-box casing (or a part connected therewith) that it will be in a lane which is transverse to that of the first blade and a central line joining its ends by which it is held will be in the plane of the first blade or in a plane substantially parallel thereto, and will also be transverse to a central line joining the ends by which the said first blade is connected. It will be appreciated that with such a mounting the blade which is so operatively connected will, as the stylus-bar rocks, be subjected to torsional stress.

Preferably in place of either one or both of the blades aforesaid two or more blades respectively are employed lying in one and the same plane.

One preferred construction according to the invention will now be described, by way of example only, with the aid of the accompanying drawings in which- Figure 1 is a perspective View illustrating a complete unit comprising the stylus-bar and its spring mounting ready for. attachment to a sound-box, and

Figure 2 is a side view illustrating the in vention applied to the sound-box.

Like reference numerals indicate like 55 parts in both figures of the drawings.

The stylus-bar 1 is formed with or has connected to it a U-shaped yoke 2. In the example illustrated, this yoke is formed at the extremity of an extension 3 which is transverse to the length of thestylus-bar, and comprises a needle or stylus socket. For thls purpose, a passage 4: is provided to receive the end of the needle or stylus and a clampmg screw 5 serves to hold the latter within the said passage.

One end of a. spring blade 6 is secured in the throat of the yoke 2. Two other spring blades 7 are each secured between a limb of the yoke and an external abutment 8 which in use projects from the sound-box casing; The two blades 7 extend in opposite directions laterally from the limbs of the yoke 2 and an imaginary line joining the ends of the blades by which they are, held respec tively. in the yoke 2 and abutment 8 is, as stated above, transverse to the length of the stylusbar and is substantially parallel with what will be the plane of the diaphragm. Such an imaginary line will, for the sake of brevity, be hereinafter referred to as a line joining the ends by which the blades are connected or by an equivalent expresson.

In the illustrated embodiment of the invention the two abutments 8 form part of a bridge-piece 9 which is formed with lugs 10 .85 by which it may be secured to a marginal wall 11 of the sound-box casing as shown in Figure 2. The stylus-bar spring blades and bridge-piece9 are therefore assembled as an unitary structure ready to be attached to the sound-box.

If the end 12 of the stylus-bar 1, that is to say that end which is to be. secured to the diaphragm, is secured directly to the latter or substantially in contact therewith, it is found advantageous to mount the parts so that the two spring blades 7 aresubstantially in the plane of the diaphragm. Alternatively it may be found preferable, in some instances, to so mount the parts that the spring blades 7 are not actually in the plane of the diaphragm but are in a plane parallel with and spaced away therefrom.

A feature of the invention therefore may be said to consist in a stylus-bar mounting comprising two spring blades (or two sets of spring blades) whereofone blade (or the blades of one set) is disposed in a plane at right-angles to the plane of the other blade (or. a plane containing the blades of the 10 iii El l

the other blade is arranged in a plane which is transverse to that of the first blade and in such a manner that a central line join ing its ends by which it is held will be trans verse to a central line joining the ends by which the first blade is connected and will be substantially in the plane of the first said blade, both said central lines being also transverse to the length of the stylus bar.

8. For a sound box of the type described, means for mounting a stylus bar comprising at least two spring blades each operative ly connected at its opposite ends respectively to the sound box casing and to the stylus bar, one of which blades is arranged substantially in a plane containing the stylus axis, and the other blade is arranged in a plane which is transverse to that of the first blade and in such a manner that a central line joining its ends by which it is held will be substantially in the plane ot the diaphragm and transverse to a central line joining the ends by which the'first blade is connected and will also be substantially in the plane of the first said blade.

9. For a sound box oi. the type described, means for mounting a stylus bar comprising a plurality of spring blades each of which is operatively connected at its opposite ends respectively to the sound b0 casing and to the stylus bar, one at least of which blades is arranged substantially in a plane which contains the stylus axis and the other blades are all arranged substantially in a plane which is transverse to that of the first men tioned blade and are so arranged that a central line joining the ends by which they are held will be transverse to a central line joining the ends by which the first blade is connected and will be substantially in the plane of the first blade.

10. For a sound box of the type described, means for mounting a stylus bar comprising in combination a U shaped yoke operatively connected with the stylus bar, an abutment to be secured to the sound box, and a plurality of spring blades, one at least of which has one end connected to the throat of said yoke, and at least two others are each secured between a limb of the yoke and the said abutment and are so arranged as to ex tend in opposite directions laterally from the limbs of the yoke in such a manner that a central line joining the ends by which they are held will be transverse to the length of the stylus bar and will be substantially parallel to the plane of the first blade.

11. For a sound box of the type described, means for mounting a stylus bar comprising in combination a ll shaped yoke operatively connected with the stylus bar, an abutment to be secured to the sound box, and a plurality of spring blades, one at least of which has one end connected to the throat of said yoke, and at least two others are each secured between a limb of the yoke and the said abutment and are so arranged as to extend in opposite directions laterally from the limbs of the yoke in a plane transverse to that of the first blade and in such a manher that a central line joining the ends by which they are held will be t ansverse to the length of the stylus bar and will be substantially parallel to the plane oi? the first blade.

12. Means for mounting a stylus bar in a sound box of the type described, said means comprising in combination a unitary structure comprising a bridge piece to be secured to the sound box, a stylus bar and at least two spring blades, each oi which blades is connected at its opposite ends respectively to the bridge piece and to the stylus bar, with one of the blades so arranged that a central line joining its ends by which it is held is transverse to the stylus axis and to the length of the stylus bar and is substantially in the plane of the other blade, and said other blade is snibstantially in plane containing the stylus axis,

13. Means for mounting a stylus bar 01 the type described, said means comprising in combination a. unitary structure comprising a bridge piece adaptedto be secured to the sound box casing, a stylus bar and a plurality oi spring blades, each of which is con nected at its opposite ends respectively to the bridge piece and to the stylus bar, one of said blades being so held that it lies substantially. in a plane containing the stylus axis, and a plurality of blades being arranged substantially in one plane and so connected that a central line joining the ends by which they are held is transverse to the length of the stylus axis and to the stylus bar but is substantially in the plane of the first named blade.

14.. Means for mounting a stylus bar of the type described, said means comprising in combination a unitary structure comprising a bridge piece adapted to be secured to the sound box a stylus bar formed with a U shaped yoke extension, and a plurality of spring blades, one of said blades being held by its opposite ends respectively in the throat of the yoke and in the bridge piece and two other blades extending in opposite directions laterally from the limbs of the yoke to the said bridge piece and secured respectively at their ends in those parts, the parts being so arranged that the plane of the first named blade is substantially in a plane containing the stylus axis, a plane containing the said other two blades is transverse to the plane of the first blade and a central line joining the ends by which said two other blades are connected is substantially in the plane of the first named blade but is transverse to a central line joining the ends by which the first named blade is held.

15. In or for a sound box of the type de- Ell) scribed, the combination of a sound box easing, a diaphragm Within said casing, a stylus bar connected therewith and having at its outer end a U shaped yoke, an abutment on said soundbox casing, a spring blade connected at its ends respectively to said abutment and to the throat oiiithe U shaped yoke and arranged in a plane which contains the stylus axis and is transverse to the length of the stylus bar, and two other spring blades extending laterally from opposite limbs of the yoke and connected each at its ends respectively to a limb of the yoke and to the abutment aforesaid, said two blades being substantially in one plane which is transverse to that of the first blade and so arranged that a central line joining the ends by which they are connected will he in the plane of the first blade but will be transverse to the stylus bar, to the stylus axis and to the central line: joining the ends by which the first named blade is connected.

16. F or a sound box of the type described, stylus bar articulating means com jirising in combination a recessed bridge pieccadapted to be secured to the sound box casing, a stylus bar contiguous with a U shaped yoke piece in the region of what will be the outer end of the stylus bar a stylus recess in the region of that outer end, a spring blade which isconnected at its ends respectively in the recess of the bridge piece and in the throat of the U shaped yoke and is arranged substantially in a plane containing the axis of the stylus recess, and two other spring blades extending late ally from opposite limbs of the yoke piece in opposite direc tions, each of said blades being conncctetl by its ends respectively to the yoke piece from which it extends and to a lateral wall of the recess in the bridge piece and both said blades being so arranged in one plane, which is transverse to the plane of the first blade, that a central line joining the ends by which those blades are connected will be substantially in the plane of the first blade but will be transverse to the length of? the .allylliti bar. to the axis of the stylus recess and to a central line joining the ends by which the first named blade connected.

17. For a soundbor: oil? the type described, means for mounting a stylus bar comprising at least two spring blades disposed with their planes at right-angles to one another and each operatively connected at their opposite ends respectively to the soundbox casing and to the stylus bar, one of said blades being flexed torsionally and the other lacing flexed longitudinally by the n'lovement ol the stylus bar.

In testimony whereof we have signed our names to this specification.

FRED KAY. WVILLIAM ERNEST CLIFTON.

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