US725343A - Hand-motor for toy gramophones. - Google Patents

Description

No. 725,343. PATENTED APR. 14, 1903. E. R. JOHNSON.

HAND MOTOR FOR TOY GRAMOPHONES.

APPLICATION FILED SEPT. 17. 1900.

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ELDRIDGE R. JOHNSON, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO VICTOR TALKING MACHINE COMPANY, A CORPORATION OF NEW JERSEY.

HAND-MOTOR FOR TOY GRAMOPHONES.

SPECIFICATION forming part Of Letters Patent NO. 725,343, dated April 14, 1903.

Application filed September 17, 1900. Serial. No. 30,240. (No model.)

1'0 aZZ whom it may concern:

Be it known that I, ELDRIDGE R.JOHNSON, I a citizen of the United States, and a resident of the city of Philadelphia and State of Penn sylvania, have invented certain new and useful Improvements in Hand-Motors for Toy Gramophones, of which the followingis a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification. This invention relates to an improved handn1otor, and is particularly adapted for run with thisobject in view my invention con-- sists in the construction and arrangement of the various mechanical parts, such as will be' hereinafter fully described, and particularly pointed out in the claims made hereto.-

' In the accompanying drawings, which form a part of this specification, andin which similar letters of reference are used to indicate similar parts, Figure l is a side elevation of a motor constructed in accordance with my invention, and Fig. 2 is a plan view of the same having the turn-table removed and illustrated in dotted lines. y In carrying out my invention I provide a frame A, cast in a single piece having a base a, which is secured to a wooden base-plate B by means of the screws b. The upper portion of the frame A, which is integral with the standard a, is in the form of a horizontal arm d, having a bearing (1 in one end for the reception of the turn-table spindle C. The lower end of the spindle C is journaled in a bearing 8, formed in the base portion a of the frame. The rear end of the horizontal arm 01 projects beyond the standard a and has provided thereina bearing f, through which passes the crank-shaft D. A short distance below the bearing f is an arm 6, having a bearing g formed in its free end, whichis in line with the bearing f, and the lower end of the crank-shaft D is journaled in this bracket,

. as illustrated in Fig. 1 of the drawings.

Rigidly secured on the crank-shaft D, be tween the beariugsfand g,.is a grooved pulley E.

On the turn-table spindle 0, directly below the bearing d, is rigidly secured a grooved pulley F, which corresponds in size .to the pulley E. An endless belt G, made of rubber or other flexible material, engages the two pulleys EF, the said belt being always under tensionand by means of which motion is transmitted from the crank-shaft D to the driving-spindle C. On the upper end of the driving-spindle C is a turn-table H, having a hub 72, provided with the grooves i, which engage a pin it, carried by the turn-table spin: dle, thus securing the said turn-table H to the spindle C, so as to revolve therewith.

, On the lower portion of the driving-spindle C is rigidly secured a large gear -wheel J, which meshes witha pinion l, rigidly secured to the governor-spindle L. This governorspiudle L is provided with pivoted bearings Z and Z journaled in the base Ct at its lower,

the governor, the upper ends of said arms being secured to a collar, which is rigidly secured to the governor-spindle at its upper end. The balls 0 are secured to the central portions of the governor-arms 'n. Pivoted to the standard 0 is a bell-crank lever P, having its horizontal arm 19 extending over the disk on, carried by the governor-spindle.

the friction-disk m. A rod R, having its innet ends screw-threaded and passing through the aperture formed in the web a, bears against the verticalarm p of the bell-crank lever P, as illustrated in Fig. l of the drawings, and by adjusting the rod R the bellcrank lever'P is moved to bring this arm 19 either closer to or farther away from the friction-disk m, as will be readily understood. The upper end of the crank-shaft D is provided with a handle d by means of which A friction-teat p is secured in the end of this arm p and bears against the upper surface of sion.

the said shaft is revolved. Secured to the base-plate B is a bracket-arm I (partly shown in Fig. 2 and broken away) for supporting the pivoted reproducer-arm in the same manner as in gramophones of ordinary type, it not being necessary to show the reproducing mechanism, as that forms no part of my invention.

In operation the record is placed in position on the turn-table H, and after the reproducing mechanism is adjusted the operator starts the motor by revolving the crank-shaft D. Motion is transmitted from this crankshaft D to the driving-spindle 0 through the medium of the pulleys E F and the rubber belt G, which is, as before stated, under tension. The governor mechanism heretofore described is geared, by means of the pinion Z and gear .I, to the driving-spindle C, and this mechanism maintains an even and regular speed to the driving-spindle. The speed of the governor may be regulated by means of the brake mechanism heretofore described.

The particular function of an elastic belt in connection with the centrifugal governor of the type shown results from the fact that at whatever speed the driving-wheel E is rotated above the normal the speed of the turntable will be approximately constant, for supposing the said wheel E be rotated at a speed much greater than that necessary to revolve the turn-table at the proper speed the turn-table will be retarded .by reason of the increased friction between the brake elements of the governor, while the elastic belt will slip upon the wheel F. This slipping is due to the fact that when the wheel F is retarded the run of the belt which is approaching said wheel is very much slackened, while the opposite run is put under a much greater ten- This causes the frictional contact between the belt and the wheel F to decrease very greatly, as will be apparent from a consideration of the well-known laws governing the design of belts for the transmission of power.

The above is especially true when the belt is used with the governor having the arrangement of parts herein set forth. Owing to the slight movement of the disk, and therefore a slight increase in speed necessary to greatly increase the friction, the change of speed of the governor, and therefore of the table, will be very small for any change in speed of the driving-wheel Therefore the elastic belt will begin to slip before there is any change in the speed of the table sufiicient to injure the character of the sound produced by the record.

Another advantage of the elastic belt arises from the equalizing action of the elasticity when a sudden change is made in the speed of the driving means. In such a case the belt will stretch and prevent such a change in the action of the governor as would cause it to jump or slip and act irregularly because of the inertia of the governor-balls.

Having thus described myinvention, what I claim, and desire to secure by Letters Pat ent, is-- 1. In a hand-motor for gramophones, the combination, means for imparting power by hand,an elastic belt connection and a centrifugal governor having frictional controlling means, substantially as described.

2. In a hand-motor for gramophones, the combination, means for imparting power by hand, a turn-table, an elastic belt connection between said means and said turn-table and a centrifugal governor connected with said turn table having frictional controlling means, substantially as described.

3. In a hand-motor for gramophones, the combination,adriving-wheel,means forturning said wheel by hand, a driven wheel, an elastic belt connecting said wheels, a centrifugal governor operatively connected with said driven wheel, said governor being of the type comprising a rotatable brake-disk and a fixed adjustable brake-shoe, substantially as described.

4. In a hand-motor for gramophones the combination, a driving-wheel,means for turning said wheel by hand, a driven wheel, an elastic belt connecting said wheels, a turntable spindle upon which said driven wheel is mounted, a centrifugal governor comprising a rotatable brake-disk and a fixed adjustable brake-shoe, and gearing connecting said governor and spindle, substantially as described.

In witness whereof I have hereunto set my hand this 14th day of September, 1900.

ELDRIDGE R. JOHNSON.

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