US 1881393 A
Description (OCR text may contain errors)
C. P. WOOD TURNTABLE DRIVE Oct. 4, 1932.
Filed Dec. 28, 1929- 2 Sheets-Sheet l I NVENTOR [flare/a2 1? Wand BY W ATTORNEY C. Pa WOOD TURNTABLE DRIVE Oct. 4, 1932.
2 Sheets-Sheet 2 INVENTOR Clzmmce 1? Wm BY w 424 ATTORNEY Filed Dec. 28 1929 Patented Oct. 4, 1932 UNITED STATES PATENT OFFICE CLARENCE P. WOOD, OF NEW YORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS, TO ROBERT B. KILL-GORE, 0F SHORT HILLS, NEW JERSEY TURNTABLE DRIVE Application filed. December 28, 1929. Serial No. 417,075.
irregularity in the feed of the projector wastransmitted to the phonograph and caused the turntable to almost imperceptibly accelerate or retard resulting in a wavering reproduction of the sound groove in the record.
It is my object to overcome this defect in direct coupled machines by means of the phonograph hereinafter described, as well as to provide a simple, cheap and sturdy phonograph which can be quickly and easily connected to any projector head and which does not interfere with the door in the projector through which access is had to the mechanism inside the head for oiling and cleaning purposes. 7
In the drawings Fig. 1 is a cross-sectional view of my improved phonograph; Fig. 2 a view of the structure of Fig. 1 on the line 22 thereof; and Fig. 3 a detail view of the mechanical filter on the turntable shaft.
My phonograph comprises a base 1, carrying a vertically adjustable housing 2, held at any required heighth by a set screw 3. This housing carries a divided turntable shaft 4:4: whose meeting ends are preferably rounded as shown in Fig. 1. The upper section 4 terminates in the record centering pin 5. The lower section 4 of the shaft rests in the bearing 6 and against the thrust bearing 7. The upper section 4 of the shaft rests in the bearing 8 and is provided with a thrust bearing 9.
The two sections of the shaft are coupled together by a resilient, elastic mechanical filter comprising a yoke 10 on the shaft section 4! and a like yoke 11 on the shaft section 4, with an elastic rubber disk 12 secured to the yoke ends, which are in staggered relation as shown in Fig. 3.
sleeve 23 apart.
The turntable 13 is very heavy, about 120 pounds in practice, so that the inertia while revolving will resist the effects of any slight variations inthe speed of the driving mechanism and hold the turntable to an absolutely steady speed.
The turntable and its'shaft are revolved by means of a worm and gear. A gear 14 is mounted on the shaft sect-ion 4 below the mechanical filter and a worm 15 is cut on the shaft 16 which is carried in the bearings 17 and 18 and projects through the bearing 18, the extended end carrying a pin 19, the bearing 17 receiving the drive thrust.
, The coupling shaft connecting the phonograph to the projecting head is made in sections. The first section is in the form of a sleeve 20 having a notch 21 in its end adapted to engage the pin 19 and carries a disk 22 on its other end. The second section is in the form'of a sleeve 23 provided with slots 2431K]. carries a disk 25. The disks 22 and 25 are coupled by means of a flexible rubber disk 26 to form a cushioned universal joint. The third section is in the form of a shaft 27 which slides in the sleeve 23 and carries a pin 28 engaging the slot 2 1, the free end .carrying a disk 29. "A spring 30 wound around the shaft 27 forcesthe shaft 27 and The fourth section comprises a shaft 30 with a pin 31 atone end and a disk 32 at the other. A. flexible rubber disk 33 connects the two disks 29 and 32 to form a cushioned universal joint. A notched nut or coupling piece 34 is adapted to be secured to the exposed end of the main or crank shaft of the projecting head and engages the pin 31.
I An arm 35 may be mounted on the housing 2 to carry the reproducing. or pick-up head of the phonograph.
In operation the phonograph and projecting head are coupled up to operate as a unit, being driven by the motor of the projecting machine. The record and film each has the starting point marked thereon and after the appropriate adjustments are made the motor is started and the projecting machine feeds the film and drives the phonograph in synchronism therewith.
The unavoidable slight irregularities in the speed of the projecting head are absorbed in the flexible rubber disks 12, 26 and 33 before they can overcome the inertia of the very heavy turntable 13 so that any slight variations in the speed of the projecting head 2 will cause the rubber disks to deform-slightly to filter or absorb the irregularities without affecting the constant speed of theturntable.
Should the projecting head he suddenly I stopped the gear 14: will climb the-worm 15 slightly lifting the mass of the turntable and then the weight of the turntable will cause it to slowly settle back, coming to a shockless stop. V
Whenthe door of the projecting machine has to be opened to oil the interior mechanism the shaft 2? is slid further into the sleeve 28 by compressing the spring 30 and the pins 31 and 19 cleared from the slots so that the projecting head is in the samecon'dition that it would be were there no phonograph associated therewith.
The principle involved may be summed up as the utilization of the mass of a very heavy turntable to store up inertia to prevent speed variations and the interposition of mechanical filters between the turntable and the projecting machine to absorb any irregularities in the drive. a
I claim A phonograph comprising housing, a divlded turntable shaft there1n,aheavy turn- I table on the upper section of said, shaft, a
yokeion the lower end of the upper shaft section, a second yoke on the upper end f i the lower shaft section, an elastic connection engaging both of said yokes, aworm gear on the lower shaft section, a driving orm en- 7 gaging said worm and adapted to be connected to the main shaft of a moving picv ture projector, whereby on the sudden stoppage of said turntable the rotary movement thereof is converted into a vertical movement for stopping said turntable without shock ,orjarh y In testimony whereof I have hereunto subscribed my name.
CLARENCE P. woon.