US1395725A - Braking mechanism for talking-machine motors - Google Patents

Description

L. H. MULLIKIN.

BRAKING MECHANISM FOR TALKING MACHINE MOTORS.

APPucATioN FILED MAR. 26. 1920.

1 95,725. Patented Nov. 1, 1921.

PATENT orFicE.

LEVIN H. MULIiIKIN, or EASTON, MARYLAND.

BRAKING MECHANISM FOR TALKING-MACHINE Morons.

Specification of Letters Patent.

Patented Nov. 1, 1921,.

Application filed March 26, 1320. Serial No. 369,140.

To all whom, it may concern Be it known that I, LEVIN H. MULLIKIN, a citizen-of the United States, residing at Easton, in the countyfof Talbot and State of Maryland, have invented certain new and useful Improvements in Braking Mechanism for Talking-Machine Motors, of which the following is aspecification.

My invention relates to speed regulating mechanism for spring motors such as are used in talking machines.

The object of the invention is to regulate the speed of the motor by means of a nonrotatable element movable back and forth with the speed responsive means and a stop to limit the effective movement of said nonrotatable element to cause the speed-responsive means to exert a pulling action on said non-rotatable element and so effect a braking or retarding action on the motor shaft. In the construction shown, the speed-responsive element is a centrifugal governor and the outward movement of the weights thereof is limited by the predetermined position of the stop and the pull of the governor sleeve upon the non-rotatable member to which it is swiveled or in which it freely turns. The greater the tendency of the weights to fly outwardly due to the speed of the motor, the greater the pull upon the nonrotatable element, and hence a braking or retarding action upon the motor shaft fol lows. This construction effectively does away with the noise and uneven action generally present where a brake pad is employed in opposition to and to one side of the center of a disk rotating with the governor sleeve.

This object I accomplish by the construction shown on the accompanying drawing in which Figure 1 is a front elevation, and

Fig. 2 is a section on line 2-2, Fig. 1.

The vertical shaft 1, which carries the usual horizontal table, not shown, is provided at its lower end with a worm 2 meshing, as usual, with a worm wheel 3 driven from a motor, not shown. The table shaft 1 is provided with a worm wheel 41 meshing, as usual, with a Worm 5 on the inner end of the governor shaft 6 mounted in the frame 7. Upon the governor or worm shaft 6 is mounted the governor sleeve 8 connected at its inner end to the inner endsof the governor springs 9 provided with weights or balls 10; the outer ends of the springs 9 being socured to a collar 11, fixedly secured to the shaft 6. WVhen the balls or weights 10 are thrown out by centrifugal action. the governor sleeve 8.will be moved to the right and with it a slide 12 mounted in a slideway 13 secured to or forming part of the frame The connection between the slide 12 and sleeve 8 is formed by means of a lateral extension 14 extending. at right angles from the slide 12, and provided at its inner end with an aperture 15 through which extends a headed collar 16 secured to the inner end of the governor sleeve. Ball bearings 16 are placed between the adjacent faces of the collar 16 and extension 14. This forms a swiveled connection and permits the governor sleeve to turn freely without rotating the slide and causes the slide to move back and forth with the sleeve under action of its weights and balls. The governor sleeve is thus, in effect, provided with an annular groove 17 receiving the apertured end of the slide.

In moving to the right as the balls or weights fly out the laterally extending end 14 of the slide 12 will be brought up against a pad or stop 19 carried by a bell crank lever 20 pivoted at 21 to the frame and having a set-screw 22 at its outer end engaged by the overlying lever 22 pivoted at its inner end to the frame and engaged at its opposite end by an adjusting screw 28. By means of these screws 22, 23 the pad 19 may be set at the exact position it is to occupy just as the pads in prior constructions were set with respect to the rotating brake disks with which they cooperated. The slide 12 is nicely fitted in the slideway 13 so that no rattling is possible, and, since the braking is effected through this slide, it will be termed the braking member or slide. There is no rotary wearing movement of the braking member upon the pad so that it will not wear down and the parts require constant adjust ment. Furthermore, the pad and braking member in my construction will bear a constant relation to each other when adjusted, and, even though the pad should get hard or be made of material harder than the felt of which such pads are commonly made, there will be no squeaky noises such as are made by friction. The effective braking action is where the collar 16 pulls upon the lateral extension 14 of the braking member or slide 12, even though a so-called anti-friction or ball hearing be employed at this point, for the greater the tendency of the weights to fiy outwardly, the greater the pull upon the anti-frictionmember with its consequent clamping or braking action.

I find that motors equipped with my im proved mechanism are entirely noiseless and they run better, due to the absence of frietion produced by the rotary disk upon a fixed pad. In talking machines absolute noiselessness of the motor and its parts is, of course, of the very highest importance.

Any form of pad or stop and means for adjusting it may be employed in lieu of that shown, as that forms no part of my invention.

I claim:

1. The combination with the governor shaft and a centrifugal governor thereon provided at one end with a loosecollar, of a sliding brake member having a laterally extending arm. swiveled at its free end to the said loose collar, a guide-way for the slide,

and a stop in the path of the said slide to limit its movement.

2. The combination with the governor shaft provided with "a centrifugal governor having a flanged collar at one end loose upon the shaft, a sliding braking member provided with a lateral arm having an aperture in which said flanged collar freely turns, a guide-way for the sliding braking member and an adjustable. stop in the path of the braking member;

In testimony whereof I affix my signature.

LEVIN H. MULLIKIN.

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