US1439533A - Talking machine - Google Patents

Description

Dec. 19, 1922. 1,439,533. J. F. SMITH.

TALKING MACHINE.

FILED 05c. 3. ms.

. means for sliding the Weight aLong the free 45 projccts.

Patented Dec. 19, 1922.

UNITED STATES PATENT OFFIGE.

JAMES. E. SMITH, OF ST: LOUIS, MISSQURI, ASSIGNQR. QB QNEI-THHED1 T ANTHONY F.

IT'DNER AND ONE-THIRD Tflw ARTHUR E. BRABEEY, ROUTE OF ST. LGKI IS, MESSGU BI;

TALKING MACHINE.

Application'filed December 3, 1919.

T0 at whom it may cOncern:

Be it known that 1. JAMES F. SMITH, a citizen of the United States. and a resident V of the city of St. Louis and State of Missouri', have invented a new and useful Emprovement in Talking Machines, of which the following is a specification.

This invention relates to talking machines and has for its principal objects to provide means for adjustin the weight of the overhanging portion or the tone arm with relation to the sound record whereby the desired pressure of the stylus on the sound record may be obtained. Another object is to provide a flexible joint or connection between the tone arm and the main sound amplifying device that will permit universal movement of the tone arm without permitting esca e of sound through the joint. A fiirthe'r o ject is to improve the tone quality by providin the tone chamber with a sound-diffusing device. Further objects appear in con nection with the following description of the invention.

"i5 The lnvcntlon consists in the arranqements and combinations oi parts hereinai ter described and claimed.

In the accompanying drawin which f'orn'is part of this s ccihcation and wl erein to like svmbols refer to like parts herever the dccur dig l is a central vertical section taken 'through a portion of a talking machine showing; my invention applied thereto, the

section'being taken lengthwise of the sound conduit;

Fig. 2 is avertical section crosswise of the sound'conduit, the section being taken on, the line 2-2 in Fig. 1;

Fig. 3 is a detail plan view showing the end of the lever arm; and

Fig. 4 is a. plan view oi the slotted late through which the weight actuating ever Referring lo the drawings, 5 iliulicatcs the top oi a ta-llrin g, machine cabinet. 6 the turn tablc on which the sound record T is mounted. Q the tone chamber and 9 the main sound '50 amplifier which leads from said chamber.

The tone arm ll is arraugwl tor easy lateral and vertical movement at its free end which has mountci thereon a sound box provided with two diaphragnts. This sound box. which is of a well known mal-re. is pro- Serial No. 342,131. M

vided with three Styluses 12, 13 and 14, the desired stylus being brought into engagement with the sound record by manual rotation of the sound box. The diamond stylus 12 is connected" to, one of the diephragms oi; the sound box and is adapted to be used with. a well known make of record having per fendicularly undulating record grooves. e Styluses, l3 and 14 are both connected to the other diaphragm of the 'cs sound box, the stylus 13 hevi a. ball tip adapted for records fiaving perpendlculfar-ly undulating record rooves and the stylus 14g having'a, sharp oint' for playing records having lhiteffi'l y undulatingwo record grooves.

The tone arm support which is, shown and described in my Patent No. 1,30%,487, dated April 29, 1919, comprises on annular supp t g: acket 15, which surrounds a. oircular opening 16 in the top of the cabinet, and is provided with a base flan, e adapted to be secured to the top. of the caiiinet' in any desired manner. Mounted on op ositeb d,isposed piv0t$ 17 within the annuiitr supporting bracket 15, so to oscillate upon a. horizontal axis and permit vertical movement of the Free end of the tone arm, is a. ring 18 whicll rotatabl'y supports tlliei enlarged end. of the, tone arm and permits the some to swing laterally. The tone arm provided with an annular flange l9, and; beaming balls 20 are arran ed in the supporting ring 18 above and be ow, the flange 19 to. reduce t e friction between the rotating tone arm and the supporting ring. A screw ring 21 is threaded into the supporti ring 18 to retain the annular flange 19 o the tone arm therein.

filommunication between the tone arm 10 and the tone chamber 9 is established by means of a flexible tube '22. This tube is preferably made of sheet rubber or other flexible material. The upper end of the (lcrdblc tube 2; is secured to the supporting: rim 18 by means of a spring clamping ring "2 and the lower cud ol' the tube is sleeved over an annular projection on the upper end ol' the sound chamber 9. A coil spring :H is positioned within the tube 2; to prevent the walls thereof from collapsing.

The upper portion of the tone chamber is provided with a sound diffusing device con1 prisino a series of vertically spaced screens f hcse screens modi'l' the sound by eliminating harsh noises and act as tone puriuers.

A horizontally disposed lever arm 25 is iulerumed in a bracket 26 secured to the under side of the top of the cabinet. This lever arm is arranged parallel with the Ion gitudinal axes of the oppositely disposed pivots if which pivotally support the tone arm supporting ring id. The end of the short arm of the lever 25 is connected to the front portion 01' the tone arm supporting ring 18 by means of a short link 27 whose upper end is pivoted between spaced lugs or ears 28 which project from the under side of the ring 18. The lower end of the link 27 is pivoted to the end of the short arm of the lever 25. A weight 29 is slidably mounted on the free long arm of the lever and serves to counterbalance the overhanging portion of the tone arm and the sound box mounted thereon.

The pressure of the stylus on the sound record may be varied by sliding the weight 29 along the long arm of the lever 25 towards and away from the fulcrum of said lever. The movement of the weight along the lever arm is controlled from outside the cabinet by means of a hand lever 30 which i fulcrumed in a slot 31 cut in the top of the cabinet. The upper end of the hand lever is provided with a. finger button and the lower end is connected to the weight 29 by means of an extcndible link comprising two sections 32 and $33. The section 32 of the extendible link has one end secured to the lower end of the hand lever 30 and its other end laps one end of the other section 33 whose other end is pivoted to the weight 29. and 33 of the extendible link are secured together by means of a pair of screws 34: which pass through a slot 35 in the section 32 and are threaded into the other section 33. This arrangement permits the link to be lengthened or shortened and thus control the length of the sliding movement of the weight on the free end of the lever 25. A. slotted plate 36 is fitted over the slot 31 in the top of the cabinet and the hand lever 30 which projects therethrou h also rojects through the slot in the plate 36. he slot 31 in the top of the cabinet is made wide enough to permit the hand lever to move lengthwise of its pivot, and the Slot in the plate 36 is provided with two notches 37 and 39 adapted to receive the hand lever and hold the same in either of its two adjusted positions.

With this arrangmnent. when it is desired to play records which require a very slight pressure ot' the stylus thereon, the hand lever lid is turned on its pivot and moved lengthwise thereof into the notch -7 in the plate 36. This action. by reason of the connection between the lower end of the hand lng.

ably mounted on the other arm of said lever The lapped portions of the sections 32 lever and the sliding weight, causes the weight to slide along the lever 25 in the direction of the bracket 26 in which the lever arm is pivoted. This causes the weight of the overhanging portion of the tone arm and the sound box to be more evenly balanced and permits the stylus to hear lightly on the record. \Vhen it is desired to play records which require a heavy pressure of the stylus thereon, the action is reversed, the hand lever being turned in the opposite direction and moved into the notch 38 in the plate 36. This causes the weight to be moved away from the fulcrum point of the lever 25 and permits the stylus to hear more heavily on the record by reason of the increased weight of the tone arm and sound box. The pressure of the styluses 12,

l8 and 14 on the sound record may be adjusted by shortening or lengthening the extendible link. This arrangement also per inits the weight to be adjusted for use in connection with tone arms of different weights.

The foregoing arrangement is considered only as an example and as the one best adapted to the tone arm shown in the draw- Therefore, I do not wish to be limited to the precise details or arrangement of parts shown in the drawing.

WVhat I claim is:

1. In a talking machine, the combination with a tone arm of a pivotally mounted supporting ring adapted to rotatably sup port said tone arm, a lever fulcrumed on said machine and having one arm connected to said supporting ring, a weight movand means for shifting the weight along said second mentioned arm for counterhaL,

ancing the weight of said tone arm.

2. In a talking machine, the combination of a tone arm, a supporting ring mounted for oscillation upon a horizontal axis and connected to said supporting ring, a weight slidably mounted on the other arm of said lever, and an operating lever connected to said weight for sliding the same along said second mentioned arm of said lever.

3. In a talking machine, the combination of a pivotallv mounted tone arm adapted to support a sound box at its true end. a lever hilt-ruined on said machine and having one arm operatively connected to said tone arm. a weight slidably mounted on the other arm of said lever. an operating lever for sliding said weight along said second mentioned arm of said leven and an extendible means connecting said operating lever to said weight.

4. In a talking machine, the combination with a pivotally mounted tone arm of a lever fulcrumed on said machine and having one arm operatively connected to said tone arm, a weight slidably mounted on the other arm of said lever, an operating lever for sliding said weight along said second mentioned arm of said lever, and an extendible link connecting said operating lever to said weight whereby the distance between said lever and said Weight may be varied.

In a talking machine comprising a cabinet, the combination with a tone arm pivotally mounted on said cabinet of a fulcrumed lever disposed entirely Within said cabinet and having one arm operatively connected to said tone arm, a Weight mounted on the other arm of said lever, and means extending outside of said cabinet l for sliding said Weight along said second mentioned arm 01 said lever for counterbalancing the weight of said tone arm.

6. In a talking machine, the combination with a pivotally mounted tone arm of a lever fulrrumcd on said machine, and having one arm operatively connected to said tone arm, a weight mounted on the other arm of said lever, means for sliding said Weight along said second mentioned arm of said lever for counterbalaneing the weight of the tone arm, and means for varying the distance between said weight and the sliding means therefor.

Signed at St. Louis, Missouri, this 29th day of November, 1912).

JAMES F. SMLTH.

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