US1266306A - Centrifugal speed-regulator for phonographs. - Google Patents

Description

v A PARNALL.

CENTRIFUGM SPEED REGULATOR FOR PHONOGRAPHS.

APPLICATION HLED APR. 12. 1915.

Patenied May 14, 1918.

' shaft 20 journaled in the UNITED STATES PATENT onrion ARCHIE E. PARNALL, OF CHICAGO, ILLINOIS, ASSIGNOR T0 FRANK W. WILLIAMS, 0]?

. CHICAGO, ILLINOIS.

GENTBIFUGAL SPEED-REGULATOR FOR PHONOGRAPHS.

Application filed April 12, 1915.

To all whom it may concern:

Be it known that I, ARCHIE E. PARNALL, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Centrifugal Speed-Regulators for Phonographs, of which the following is a full, clear, concise, and exact description, reference being had to the accomformlng a part of th1s panying drawing, specification. I

My invention relates to phonographs and more specifically to improvements in the means for controlling the starting and stop. ping and speed of the record support.

ong the objects of my invention is to provide such means which will be simple in construction and efficient in use, and in which the same lever which controls the starting and stopping of the record support is also used in controlling the speed.

Further objects will appear from the detailed description to follow and the appended claims.

In the drawing, in which I have illustrated one embodiment of my invention- Figure 1 is aplan view of a phonograph showing the controlling lever and the adjustable stop;

Fig. 2 is a vertical section substantially on the line 22 of Fig. 1, showin the governing mechanism and the control and the connections therebetween; and

Fig. 3 is a section substantially on the line 3-3 of Fig. 2 showing the driving and transmission mechanism and the governing mechanism.

Referring now to the drawing in detail the parts of the phonograph shown comprise the casing or cabinet 10 havin a top 11, side walls 12, a base 13, the cIr-iving and transmission mechanism indicated in general at 14, the governing mechanism indicated at 15, and the starting, stopping and speed controlling mechanism indicated at 16..

The driving, transmission and governing mechanism is supported by and between two plates 17 and 18 (Fig. 2), which plates are connected together and supported from the top 11 of the casing by means of three upright posts 19. The driving and transmission mechanism comprises a vertical lates 17 and 18, a pinion 21 secured to the s aft 20 and driven from any suitable source of power, such as Specification of Letters Patent.

on the upper end of the ing lever,-

Patented May 14, 1918. Serial N 0. 20,863.

a spring motor (not shown),

meshing with a pinion 23 which is secured on a vertical shaft 24 journaled in the plates 17 and 18. The upper end of the shaft 24 extends through an opening 25 in the top 11 of the casing and has secured thereto the record support indicated in dotted lines at 26 (Figs. 1 and 2), on which the record, indicated at 27, rests. A spur gear 28 is secured to the shaft 24 and meshes with a pinion 29 which is secured on the governor shaft 30 which is mounted in suitable bearings on the plates 17 and 18. A collar 31 (Fig. 2) is secured shaft 30 by means of a set screw 32. Spring strips 33 are secured at their upper endsto the collar 31 and at their lower ends to a collar 34 which is slidably mounted on the governor shaft 30. Weights 35 are secured to the springs 33 intermediate their lengths. A friction brake disk 36 is secured to the collar 34 to slide therewith and is engaged by a brake shoe 37 which may be a felt punching, secured to one arm 38 of a bell crank lever 39 which is mounted on a bracket 40, secured to the plate 18, by means of a screw 41 extending through the bracket and lever. The

other arm 42 of the lever 39 extends upwardly through the opening 25 and into an opening 43 in thelink44 which is adjustably secured to the lever 45 by means of a wing nut 46 which engages a threaded memer extending through the slot 47 in the link 44. The lever 45 is pivotally mounted on the top 11 of the casing in any suitable manner as by means of a screw 48 extending through an opening in the lever and into the tog 11 of the casing.

' he movable end of the lever 45 extends through a slot or opening 49 in a bracket or keeper 50 which 1s secured to the top 11 by means of screws 51. The slot 49 has an off-set portion 52 with which the end of the lever 45 engages when it is moved to the extreme left, the lever 45 being constructed of resilient material and the tension in the lever being such as to tend to hold the end of the lever up in the off-set portion 52. The lever 45 has a projection 53 which is used ,as a pointer and also engages an adjustable pitch and tempo spiral face or edge portion with which the projection 53 engages. Graduations 58 are provided adjacent the spiral edge 57 for cooperation with the pointer 53. The phonograph is provided with the usual handle 59 for winding up the spring and with the usual tone arm, the base of which is indicated diagrammatically at 60.

The use and operation of my device is as follows: Assuming that the lever is in its left hand'position and that its end is engaged within the off-set portion 52 of the slot, the friction between the brake shoe .3? and the brake disk 36 will be so great that the motor will not be able to drive the record support. The adjustable stop 54 is then set to give the desired time and pitch to the selection to be played by manipulating the thumb piece 56 and observing the graduations 58 and the pointer 53. The end of the lever a5 is then pressed down to release it from its engagement within the ofi-set portion 52 of the slot and the lever is then moved to the right until the projection 53 comes into engagement with the spiral edge or face 57 oi the adjustable stop 54. lhis movement of the lever 45 raises the brake shoe Bland permits the motor to rotate the record support and also the governing mechanism until the weights 35 on the governing mechanism fly out sufficiently against the tension of the springs 33 to lift the friction plate 36 up against the brake shoe 3'? with suficient force to maintain the speed of the governor, and consequently the record support, constant.

it will be seen that the speed at which the phonograph will run will depend on the height to which the brake shoe 37 is lifted which, in turn, will depend upon the distance to which the lever i5 is moved to the right, and that this distance will depend on the position of the adjustable stop 5%. After the stop 51 has been set to give the desired the phonograph can be and-started again as often as destopped the sired and will always come baclr to same pitch and tempo.

The adjustable connection between the link and the lever is is provided to take up the wear on the parts such as the wear brclre shoe and the friction between the will be device in 1 and speed by means or ima es nections with the governing device, and means are provided whereby after the desired pitch and tempo have been provided for the machine may bestopped and started as often as desired and will always come back to the desired pitch and tempo.

Having thus described my invention what I claim as new and desire to secure by I Letters Patent is 1. A phonograph comprising movable speed controlling means accessible for manual operation and movable to a position to stop the phonograph, and an adjustable stop for said speed controlling means, said stop having a spiral face for engagement with said speed controlling means.

2. A phonograph comprising movable speed controlling means accessible for manual operation and movable to a position to stop the phonograph, and a rotatable adjustable stop for said speed controlling means.

3. A phonograph comprising a movable speed controlling means accessible for manual operation and movable to a position to stop the phonograph, and an adjustable stop for said speed controlling means, said means having a projection thereon for engagement with said stop.

l. A phonograph comprising a movable speed controlling means accessible for man ual operation and movable to a position to stop the phonograph, and an adjustable stop for said speed controlling means, said stop having a spiral portion, and said means having a projection thereon for engagement with said spiral portion.

5. A phonograph comprising movable speed controlling means accessible for manual operation and movable to a position to stop the phonograph,and an adjustable stop for said speed controlling means, said stop comprising a flat member having a spiral edge for engagement with said speed controlling means.

6. A phonograph comprising movable speed controlling means accessible for manoperation and movable to a position to stop the phonograph, and an adjustable stop for said speed controlling means, said stop comprising fiat member having a spiral 3 with said speed conthumb piece for adl have hereunto sub-

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