US652485A - Combined gear-muffler and shunt for magneto-generators. - Google Patents

Description

No. 652,485. Patented June 26, I900. J. G. NULEN.. COMBINED GEAR MUFFLER AND SHUNT FOB MAGNETO GENERATORS.

(Application filed May 10, 1900.) V (No Model.) 2 Sheets-Sheet l.

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No. 652,485 A Patented June 26, 1900.

J. a. NOLEN.. COMBINED GEAR MUFFLER AND SHUNT FOR MAGNETO GENERATORS.

(Application filed May 10, 1900.) (No Model.)

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UNITED STATES PATENT OFF-ICE.

JAMES G."NOLEN, OF CHICAGO, ILLINOIS, ASSIGNOR OF TW'O-THIRDS TO STANLEY A. DUVALL, OF SAME PLACE, AND BENJAMIN F. STEWART,

OF EVANSTON, ILLINOIS.

COMBINED GEAR-MUFFLER ANDSHUNT' FOR-MAGNETO-GENERATORS.

SPECIFICATION forming part of Letters Patent No. 652,485, dated June 26, 1900. Application fild May 10, 1900. Serial No. 16,207. (No model.)

To ctZZ whom it may concern:

Be it known that I, JAMES G. NOLEN, a citizen of the United States, residing at Chicago, Cook county, Illinois, have invented certain new and useful Improvements in a Combined Gear-Muffler and Shunt for Magnetic Generators; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improved gearmuflier and shunt for telephone magneto-generators and the like.

The object of my invention is to provide a mechanism by means of which the noise in the gear-driven magnetogenerator due to backlash will be avoided, while at the same time the mechanism used for this purpose will also participate in the automatic opening and closing of a shunt-circuit around the armature-coils of the generator.

With this general object in view my invention consists in the features, details of con- 2 5 struction, and combination of parts, which will first be described in connection with the accompanying drawings, and then particularly pointed out in the claims.

In the drawings, Figure 1 is a side elevation 0 of a magneto-generator embodying my invention in its preferred form; Fig. 2, an end elevation of the same; Fig. 3, a detail viewindicating the circuits; Fig. 4, a view of a part of the movable spring-arm; Fig. 5, a similar 3 5 view of a modified form of spring-arm; Fig. 6, a detail view, in side elevation, showing the gear-muffling mechanism in position for assembling; Fig. 7, a side elevation of a generator, showing the shunt-circuit opened; Fig.

0 8, a similar View of a modified form of myinvention and Fig. 9, adet'au perspective view of the end of the armature-shaft, the sleeve, and the pinion.

Referring to the drawings, A is a magnetogenerator provided with a crank A, fixed to the end of a crank-shaft A mounted in bearings a a inthe generator-frame. Upon this crank-shaft is secured a gear-wheel A The generator has its armature-shaft A extended at one end, said end being preferably reduced in diameter and provided with a radial pro jection a preferably in the form of a feather or spline, as shown in Figs. 6 and 9. This spline is located somewhat inward from the end of the armature-shaft, and on that por- 5 5 tion of the shaft which projects beyond the spline is loosely mounted a pinion B, which has an inward-extending projection b, preferably V-shaped, the said pinion meshing with the gear-wheel A The pinion is held on the shaft by a washer Z), secured to the end of the shaft A by a screw b j The projection b on the pinion enters a correspond ingly-shaped groove in a sleeve C, which is movably mounted on that part of the arma+ ture-shaft which is provided with a spline, the said spline being received in a key way or slot 0, Fig. 9, in said sleeve. The inner surface of the sleeve is in contactwith a washer C, which bears against the end of a movable spring-arm D, which arm has one end secured to and in electrical communication with the generator-frame. O ver this fixed 'end of said spring-arm D is secured a fixed contact sprin'g D, which is insulated from the spring-arm D by a layer of insulating material, as indicated at d, the said contact-spring D having a contact-point d, arranged to contact with the spring-arm D when the latter is in its normal position.

The end of the spring-arm D which bears against the sleeve C may be forked to receive the armature-shaft A, as shown in Fig. 5, or preferably may have an eye formed thereon, through which the shaft passes, as is shown in Fig. 4.. v v

Inside the movable spring-arm D is located a helical spring E, surrounding the arm ature shaft A", which spring assists the spring-arm D in pressing the sleeve Coutward. v

The end of the armature-shaft A which is opposite the driving mechanism is provided with a pin F, insulated from said armatureshaft and connected to one end G of the armature-winding, the other end GA of which winding is connected to the armature-shaft in the usual way. The pin] F is insulated from the armature -shaft A in'an'y' desired 1nanneras, for example, by driving it into a hole in a bushing g, of vulcanite or the like, Fig. 3, which bushing is inserted in a hole in the end of the armature-shaft. A spring H is arranged to bear against the pin F, said spring being insulated from the generatorframe, as shown in Fig. 1.

The generator frame is provided with a binding-post I, Fig. 7. The said bindingpost and the spring II form the two terminals of the apparatus. The spring II is connected by a conductor h to the fixed contactspring D.

The manner of connecting the generator with the line being well known need not be described.

The operation of this apparatus is as follows: When the generator is not in operation, the sleeve G is held at its extreme outward position by the resiliencies of the movable spring-arm D and the coiled spring E. In this condition the contact-point d of the fixed contact-spring D touches the outer face of the movable spring-arm D, whereby the circuit from the lines is closed not only through the armature-coils in the usual way, but also through the spring-arm D, contact-point cl,

fixed contact-spring D, conductor h, and contact-spring II, the shunt-conductor It being in parallel with the armature-coil. The resistance of this divided path is therefore very low. When the crank A is turned to operate the generator, the initial rotation of the gearwheel A causes the pinion B to rotate, and the sleeve 0 is moved longitudinally inward against the action of the movable spring-arm D and the coiled spring E, thisinwardmovement of the sleeve 0 being due to the fact that the inclined surfaces of the projection b on the pinion acting against the corresponding inclined surfaces of the groove in the end of the sleeve translate the movement of rotation of the pinion B into a longitudinal movement of the sleeve 0. This movement of the sleeve causes the spring-arm D to leave the contact-point cl, thus opening the shunt-circuit through the conductor h, as will be understood from Fig. 7. As the sleeve 0 moves inward the resiliency of the spring becomes greater and finally prevents the further inward movement of the sleeve at such a point that the sleeve is still in engagement with the feather or key a whereupon the rotation of the pinion 13 produces rotation of the armature-shaft, and thus causes the generation of electricity in the armature-coil. As the shunt is open at this time, the current of electricity is sent out on the line. WVhen the operation of the generator is stopped, the spring-arm D, assisted by the coiled spring E, forces the sleeve 0 outward into its normal position, at the same time closing the shunt-circuit by coming into contact with the contact-point d.

It will be noted that during the operation of the generator the resiliencies of the spring arm D and of the coiled spring E keep a certain amount of yielding pressure on the pinion in a direction opposite to that in which it is being rotated. Hence all backlash between the pinion and its gear-wheel is taken up, and thereby all rattling is avoided and the noise of operation of the gear and pinion is reduced to a minimum.

In Fig. 8 I have shown a modified form of my invention, which differs from that previously described only in having the spring contact-arm D and the fixed contact-spring D located above the armature-shaft instead of below it.

Referring to the preferred form of springarm D, (shown in Fig. 4,) it is to be noted that as the end of the said spring-arm encircles the crank-shaft the pressure of the sleeve 0 is brought upon the end of the spring in an even manner, and at the same time all twisting of the spring is avoided. It will be noted that the said spring D, whether made in the form shown in Fig. 4 or that shown in Fig. 5, not only performs its function of closing the shunt circuit, but also acts to assist the spring E in returning the sleeve 0 to its normal position.

In addition to the above advantages it will be seen that but two contact-springs are necessary with my constructiomand these springs are so located as to be easily attached and readily accessible.

It will be seen that the inclined projection b on the pinion B and the correspondinglyinclined rentrant surfaces on the sleeve 0 form what may be termed cam-surfaces, and these cam-surfaces together form a cam device, which, in combination with the sleeve 0, the spring E, and the spline a forms a flexible connection between the armature-shaft and the pinion B, which also acts as a backlash device. Of course the spring-arm D may be employed alone as the spring device for pressing the sleeve outward; but in order not to unnecessarily wear out the spring D the coiled spring E is preferably employed also.

Having thus fully described myinvention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a magneto-generator, the combination with an armature-shaft, and means for rotating the same, of a backlash device intermediate said rotating means and the armatureshaft, and a circuit-breaking device operated by the backlash device.

2. In a magneto-generator, the combination with a gear-wheel and means for rotating the same, of a pinion driven by said gear-wheel, an armature-shaft, a flexible connection between said pinion and the armature-shaft, and a circuit-breaking device operated by the flexible connection.

3. In a magneto-generator, the combination with a driving-wheel, and means for rotating the same, of a driven wheel loosely mounted on the armature shaft, a sleeve longitudinally movable on the armature-shaft, a cam device intermediate the driven wheel and the sleeve and means for yieldingly pressing the sleeve toward the driven wheel.

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able spring' arm provided with an opening at one end into which enters the armature-shaft, and a coiled spring encircling the armatureshaft and arranged to press the spring-arm and sleeve outward, of a fixed contact-spring arranged to engage the spring-arm when the latter is in its outward position.

In testimony whereof I affix my signature in presence of two witnesses.

JAMES G. NOLEN.

WVitnesses:

G. A. PATTERSON, M. E. BUEHRLE.

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