US1227091A

US1227091A - Speed-regulating apparatus.

Info

Publication number: US1227091A
Application number: US87501014A
Authority: US
Inventors: John B Taylor
Original assignee: Individual
Current assignee: Individual
Priority date: 1914-12-01
Filing date: 1914-12-01
Publication date: 1917-05-22
Anticipated expiration: 1934-05-22

Description

J. B. TAYLOR.

SPEED REGULATING APPARATUS.

APPLICATION HLED DEC-1. 1914.

1,227,091 A Patented May 22, 191%.

WITNESSES I l/VI/E/VTOB Jzahn BTaglor BY M M M TTURNEYS JOHN B. TAYLOR, 015' SGHENECTADY, NEW YORK.

SPEED-REGULATING APPARATUS.

Specification of Letters Patent.

Patented May 22, 1917.

Application filed December 1, 1914. Serial No. 875,010.

To all whom it may concern.

,Be t known that 1, JOHN B. TAYLon,.a citize'n of the United States, residing in Schenectady, county'of Schenectady, State of New York, have invented certain new and useful Improvements in Speed-Regulating Apparatus; and I do hereby declare the following to be a full, clear, and exact description of the invention, suchas will enable others skilled in the art to which it appertains to make and use the same.

' stretched so that they may vibrate much like the strings of a piano. Preferably these strings are mounted in the musical instrument so as to be subject to temperature and other atmospheric changes in the same way and to the same extent as the sounding strings of the instrument. These vibrating strings of the speed. regulator are tuned, one slightly above a certain pitch and the other slightly below that pitch. Then, by providing current connections whereby the strings may be mechanically vibrated with a speed corresponding to the speed of the motor to be controlled, any change infrequency of that motor will cause one of the strings to vibrate with greater amplitude than the other. By mounting a suitable stop or movable element controlled in position bythe differential action of the two strings, connections may be made or other changes effected whereby the. motor is either increased or decreased in speed and returned to its normal or standard rate of rotation. The

mechanical details may be varied in many Ways, and the electrical mechanism for vibratingthe strings and for using their differences in amplitude of vibration may be constructed in many ways, but for the purpose of making clear'the central idea of my present invention, I have disclosed in the accompanying drawings, somewhat diagrammatically, one embodiment thereof.

In the accompanying drawings, Figure 1 is a perspective illustration, largely diagrammatic, showingthe vibrating strings and the magnet by which they are vibrated, and the differential mechanism by which that difference in vibration is utilized.

F 2 is a diagram of the electrical connections.

Fig. 3 illustrates a modification of the invention.

In the embodiment illustrated, the vibra+- ing strings 1 and 2 are shown as mounted on a suitable support over bridges 3 and at and tuned by means of pegs 5 and'6 until the natural vibratory period of string 1 is somewhat higher than a certain standard, and the natural vibratory period of string 2 is lower than that standard by an equal amount. 7 v

A means is provided for vibrating the strings either continuously oraoccasionally,

' as the circumstances may require, this means comprising a U-shaped electroinagnet 7 energized by pulsating current transmitted from the

current supply conductors

8 and 9 through a suitable interrupter 10, driven in synchronism with the motor 11 of the musical instrument or other device. If desired a commutator may be directly coupled with the motor, as indicated in Fig. 2. Alternating current may be used in place of pulsating current when more conveniently obtainable, as by the use of an alternating current generator in place of interrupter 10, but whether alternating current or pulsating current is used, the vibratory efi'ect setup in the tightly stretched Wires 1 and 2 should represent the speed of motor 11, and for normal speed of that motor, should be intermediate between the normal vibratory periods of the wires 1 and 2. In Fig. 3 there is shown an alternating current generator 25 driven by the motor 11 and adapted to energize the magnet 7 over conductors 26. When the speed'of the motor increases, the pulsations at the electromagnet will more closely approach the natural vibratory period of string 1, and the amplitude of its vibration will be increased thereby, while at the same time the vibrations of string 2 will decrease,- and, similarly, on a decreasing speed of the motor, the pulsations of the electromagnet will more closely approach the normal vibration of string 2 and the amplitude of the latter will increase.

Differential mechanism of various types may be utilized for converting this variation in the mechanical vibration of strings 1 and 2 into mechanical movement whereby the motor maybe restored to normal speed corresponding to vibrations intermediate between the two strings, and the device now preferred by me comprises a stop 12 pivoted at 13, this stop having a head 14 faced with a layer of felt and in position to receive blows from the vibrating strings, and having a tail 15 for varying the effectiveness of the resistance in the motor field circuit.

The motor here illustrated has a shunt field 16 with a resistance 17 in series there with across the armature. The outer end of resistance 17 is connected to an adjustable contact 18, and the outer end of the field winding 16 is connected to a similar adjustable contact 19 through a resistance 20. Be-

tween the contacts 1'8 and 19, and in position to establish connection therewith, is the tail 15' of the swinging element 12, which moves on its pivots 13 in accordance with the differential action of the vibrating strings 1 and 2. The inner end of field winding 16 is connected to the pivots 13 and so completes the connection to the swinging tail 15. This arrangement of resistances, field winding and vibrating contact is somewhat in the nature of a T irrill regulator, effective for varying the excitation of the motor by controlling the shunt around the field winding, for as the speed of the motor increases above normal, the amplitude of the high pitched wire- 1 will increase and the amplitude of the low pitched wire 2 will decrease, and their differential action will cause the swinging element 12 to vibrate into and out of engagement with contact 18, thereby re- .ducing the effective resistance in circuit with the field 16 and thus strengthening-the field and bringing the motor speed down toward normal. If, on the other hand, the. motor speed tends to drop off, as because of a sudden heavy load on the motor, the swinging tail 15 will vibrate into and out of connection with contact 19, thus shunting current through resistance 20 and around the field 16, thereby decreasing the field excitation and causing the motor to increase in speed. At normal speed for the motor the swinging element 12 will be in its mid-position with its tail 15 vibrating between

contacts

18 and 19.

I am aware that other means may be provided for utilizing the differential action of the two strings or wires to accelerate or retard the motor, and that it is not necessary to operate on the motor field circuit and that the motor and its adjuncts may be of a character quite different from those indicated diagrammatically by the drawings, and that other governing and controllin mechanism responsive to the differentia action of the two wires will readily suggest themselves to persons skilled in the art.

What I claim is: I

1. The combination of a motor subject to variations from its predetermined speed, a pair of vibrating elements having different natural vibratory periods, means for vibrating said elements at a frequency corresponding with the speed of the motor, and means responsive to the differential action of said vibrating elements and tending to hold said motor at substantially its predetermined speed.

2. The combination of an electric motor subject to variations from a predetermined speed, a pair of vibrating elements having different natural vibratory periods, means responsive to the predetermined speed of vsaid motor for vibrating said elements at a frequency intermediate their respective natural frequencies, and means responsive to the differential action of said vibrating elements for varying the excitation of said motor.

3. The combination of an electric motor subject to variations from a predetermined speed, a pair of stretched Wires differently tuned, means responsive to the predetermined speed of the motor for vibrating said wires at a frequency intermediate their natural frequencies, and means responsive to differences in amplitude of said vibrating wires for varying the excitation of said motor. v

4. The combination of a pair of vibrating elements tuned respectively to high and low frequency, means for normally vibrating said elements at an intermediate frequency and control mechanism responsive to the difference in vibratory amplitude of said elements.

5. The combination of a motor subject to variations from a normal speed, a pair of stretched wires having different normal vibratory frequencies, electromagnetic means responsive to the predetermined speed of said motor for vibrating said wires at an intermediate frequency, a swinging element responsive to the difference in amplitude of vibration of said wires, and means controlled by said swinging element for var ing the excitation of said motor to hold 1t at substantially normal speed.

6. Apparatus of the character described comprising in combination, a device subject to variations from a predetermined speed, a plurality of vibrating elements having different natural vibratory periods, means responsive to the predetermined speed of said device for vibrating said elements at a frequency intermediate their respective natural requencies, and means responsive to the diiferential action of said vibrating elements for maintaining substantially the predetermined speed of said device.

7. Apparatus of the character described comprising, in combination, a device subject to variations in speed, a plurality of vibrating elements having different natural vibratory periods, means for vibrating said elements at a frequency dependent upon the.

speed of said device, and means responsive to the differential action of said vibrating elements for maintaining substantially a predetermined speed of saiddevice.

8. Apparatus of .the character described comprising, in combination, an electric motor subject to variations in speed, a lurality of vibrating elements having di erent natural vibratory periods, means for vibrating said elements at a frequency dependent upon the speed of said motor, and means responsive to the differential action of said vibrating elements for varying the excitation of said motor.

9. Regulating apparatus for a device subject to variations in speed comprising, in combination, a plurality of vibrating elements each having a natural vibration frequenc means under the control of said device or causing variations in the relative amplitudes of said vibrating elements dependent upon variations in speed of said dev1ce,and means dependent upon the variations in relative amplitudes of said elements for controlling the speed of said device.

10. Apparatus of the character described comprising, in combination, a rotating ar'-. mature subject to variations in speed, an exciting field for said armature, a plurality of vibrating elements each having a natural frequency of vibration, means under the control of said armature for causing variations in the relative amplitudes of said vibrating elements dependent upon variations in s eed of said armature, and means depen ent upon the variations in relative amplitudes of said elements for controlling the excitation of saidfield.

11. Apparatus of-the character described comprisin in combination, a rotating armature su ject to variations in speed, an

of the armature for vibrating said elements at a'frequency intermediate their respective natural frequencies, and means responsive to the differential action of said vibrating elements for varying the excitation of said field.

13. Apparatus of the character described comprising, in combination, a device subject to variations in speed, a plurality of v1- 'brating'elements each having a natural frequency of vibration, means for vibrating said elements at a frequency corresponding with the speed of said device, and means responsive to the differential action of said vibrating elements for maintaining substantially constant the speed of said device.

14:. Regulating apparatus of the character described comprising, in combination, a device subject to variations from a predetermined speed, a pair of vibrating elements each having a natural frequency of vibra-- tion, means responsive to the predetermined speed of said device for vibrating said elements at a frequency intermediate their respeotive natural frequencies, and means responsive to the differential action of said vibrating elements for maintaining substantially the predetermined speed of sald device.

In testimon whereof I aflix my signature, in presence 0 two witnesses.

JOHN B. TAYLOR. Witnesses:

Lomsn Barns, M. A. BILL.