US1815559A - Vibration eliminator for phonograph turntables - Google Patents

Description

'July 21, 1931. c. e. GARRIGUS VIBRATION ELIMINATOR FOR PHONOGRAPH TURNTABLES Filed April 10. 1929 BY I y I l ATTORNEY Patented July 21,1931

UNITED STATES PATENT OFF-ICE CLARENCE G. GARRIGUS, OF BRISTOL, CONNECTICUT, ASSIGNOR T WM. H. BRISTOL TALKING PICTURE CORPORATION, OF WATERBURY CONNECTICUT, A CORPORA- TION OF CONNECTICUT 'V IBRATION ELIMINATOR FOR PHONOGRAPH TURNTABLES Application filed April 10,

The invention relates to sound translating apparatus as utilized in the recording and reproduction of sound, more especially to apparatus of this nature embodying a turn- 61 table for supporting and rotating a suitable disk record or blank and to which table rotational movement is communicated through an intermediate shaft from a suitable driving member, as a spring or electric motor.

More particularly, the invention has to do with sound translating apparatus of a system wherein the sound finally is rendered in greatly magnified volume, as in the exhibition of motion pictures in association with 1 such sound. The synchronized driving mechanism in a system of this character, in the making of the original records as well as in the ultimate reproduction therefrom, has been found to cause more or less vibration of 2 the disk-supporting" turntable employed, which vibration may 'objectionably affectthe sound reproduction, the same being more apparent when the sound is to be thus greatly magnified.

It is the object of the present invention to afford means in connection with the driving of the turntable of such sound-translating apparatus whereby vibration of the same is substantially eliminated so that no excessive vibration or vibrations as would objectionably afiect reproduction of sound prevails.

In carrying out the invention there is introduced between the driving means and the turntable a torque or transmission shaft which is suitably mounted therebetween and v constructed in such a manner that any excessive vibration introduced by the initial driving means will be resisted and taken up in said connection and not be transmitted to the supporting turntable for the disk or blank rotated thereby. f To this end, flexible joints are preferably provided at the points of connection of the 1 torque shaft respectively to the driving mechanism and to the immediate turntable shaft;

and said torque shaft,. furthermore, is constructed of two axially displaceable elements relatively movable to eliminate vertical or axial vibrations and having laterally or radi- 60 ally extending coacting arms affording a cou- 1929. Serial No. 353,947.

ple acting at an appreciable distance from the shaft axis for the transmission of the rotational movement and tending to resist and balance out any twisting or torsional movements which might otherwise be transmitted through said torque shaft to the turntable, whereby rotation is transmitted to the latter in a perfectly smooth and steady manner, The upper displaceable element, furthermore, is made comparatively heavy to damp out effectively vertical vibrations, and a fly wheel or like mass orload device may be further secured thereto above the arms to absorb any vibrations which might pass the other means provided.

The nature of the invention, however, will best be understood when described in connection with the accompanying drawings, in which:

Fig. 1 shows in perspective the novel connection as introduced between the driving mechanism for a turntable and the said turntable.

Fig. 2 is an enlarged front elevation, partly in vertical section, of the novel torque shaft Referring to the drawings, 10 designates the synchronized driving mechanism for operating a turntable 11, said driving mechanism being of any well known or special design, and, in the embodiment illustrated, serving to rotate a vertically disposed shaft 12 in synchronism with motion picture taking or projecting apparatus (not shown) and all of which is well understood and forms no particular part of the present invention.

The turntable 11 is secured to a shaft 13 vertically disposed in a suitable bearing 14 and mounted at the top of a tripod support 15 whose legs are pivotally connected thereto at 16, as indicated, and surround or enclose the driving mechanism 10, and have rubber feet or pads 15 to absorb vibration from the floor. A device 17 as an electric pick-up or cutter provided with a stylus 18 is designed to cooperate in the usual manner with a sound record or record shown) and which is adapted to be supported on the table 11.

Between the shafts 12 and 13 there is in troduced a motion transmitting member disblank of the disk type (not posed in the vertical axis of the tripod support and comprising two telescoping elements as the tube or sleeve 20 and rod 21 which is adapted to extend and slide therein. The '5 said elements are connected, through flexible or spring joints 22 and 23, respectlvely with the corresponding shafts 12 and 13 so that vertically acting Vibrations will be materially damped thereby. As stated, the two elements are, designed to be freely slidable one within the other; and to transmit rotation of the one element 20 the other element 21, a further slidable connection is made between the two but at points laterally or radially displaced with respect to the longitudinal axis of said telescoping elements 20 and 21. For this purpose, the inner end of the element 20 is provided with a head having the oppositely and diametrically extending arms 24 and 25 which are bored through at their ends to receive rods 26 and 27, respectively, and extending therein from a further and comparatively heavy head member or slider, having the correspondingly directed arms 28 and 29 with shouldered ends 30 and 31, for engagement with the said arms 24 and 25. This latter head, moreover, is adapted to fit over and to be rigidly secured to the element 21, as by means of a set screw 32 bearing on the flattened surface 33 of said element, whereby the slider head is secured against rotationon its rod and, also, whereby the two telescoping elements may be adjusted relatively to each other in accommodating the same between the shafts 12 and 13 and such that the rod members 26 and 27 will always fit, within the limits of possible vertical vibration, in the ends of the arms 24 and 25, respectively.

By this expedient, the rotational movement imparted to one of the telescoping elements from the driving means will be communicated to the. other through the respective arms and the slidable rods in engagement therewith. Also, by securing a suitable mass 34 to the rod 21 at a position between the said slider and the corresponding upper flexible joint, the same will act as a fly wheel to give the rod sufficient inertia to overcome or absorb any vertical or rotational vibrations which might pass the aforesaid slidable coupling between the rod and sleeve, thus further insuring against objectionable transmitted vibrations.

I claim:

1. In a phonograph apparatus embodying a turntable and a synchronized driving member therefor: a vertically disposed transmission shaft for operating the turntable, comprising two telescopically mounted elements connected between the said turntable and driving member, and driving means connecting the telescopic elements and embody- 05 ing radially displaced coupling elements unturntable and a synchronized driving member therefor: a vertically disposed transmission shaft for operating the turntable, comprising two telescopically mounted elements, flexible joints connecting the telescopic elements respectively to the said turntable and driving members, and driving means connecting the telescopic elements and embodying radially displaced coupling elements unattached to each other and adapted for transmitting rotation therebetween.

4. In phonograph apparatus embodying a turntable and a synchronized driving member therefor: a vertically disposed transmission shaft for operating the turntable, comprising two telescopically mounted elements, two head members having arms extending radially therefrom, one head being rigidly con-' nected with, one of the telescoping elements and the other adj ustably secured to the other element, and rods extending from one of the heads parallel to the axis of the telescdpic elements and slidably mounted in sockets prolxlidild in the ends of the arms of the other 5. In phonograph apparatus embodying a turntab-leand a synchronized driving member therefor: a vertically disposed transmission shaft for operating the turntable, comprislng two telescopically mounted elements, 110 two head members having diametrically opposed arms extending radially therefrom, one head being rigidly connected with one of the telescoping elements and the other adjustably secured to the other element, and rods "I extending from one of the heads parallel to the axis of the telescopic elements and slidably mounted in sockets provided in the ends of the arms of the other head. V

6. In phonograph apparatus embodying a ll turntable and a synchronized driving member therefor: a vertically disposed transmiss1o n -shaft for operating the turntable, comprising two telescopically mounted elements, two head members having diametrically op- 18 posed arms extending radially therefrom, one head being rigidly connected with one of the telescoping elements and the other secured to the other element, and having shoulders adapted for engagement with the other head "at n eie eee member, and rods extending from the shoulder of the one head parallel to the axis of the telescopic elements and slidably mounted in sockets provided in the ends of the arms of the other head.

In testimony whereof I afiix m signature.

CLARENCE G. G RIGUS.

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