Патент USA US2412536код для вставки
1. Dec. 10, '1946. F. RIEBER 2,412,536 MEGHANICALLY TUNED OSCILLATOR ' Filed Jan. 219, 1944 4-0 . ‘ o _ a Ill. IN VENTOR By v '"W. ‘- Patented Dec‘. 710, ‘1946 ‘I “ 2,412,536 10mm ' STATES PATENT (OFFICE v V ‘ MECHANICALLYTUNEDOSCELATOR Richer, New Yer-k, N. Y., assignor to Inter-v val Instruments, Inc. , New York, N. Y., a corpo ration of New York v ApplicationJanuary29, 1944, Serial N... 520,204 9 Claims. (01. 250-36) . 2 ' This invention relates to a device for readily measuring the frequency of an alternating cur They may, however, be so designed as to impose rent with great accuracy. In my copending application for transducers ?led of even date herewith and bearing Serial port the weight l9, and they are intended to be an initial tension on the wire I8, as well as sup such as to offer no restraint to the movement of the weight l9 along the axis of the shell, so long No. 520,196, I have disclosed a transducer in as that movement does not exceed a small which the period of vibration of a stretched wire is so coordinated with an alternating current that the frequency of the alternating current may be determined by measurement of the tension upon the wire. In that application the tension upon amount. The lower end of the lower stud 23 is provided with a nut 24 which may be arranged to engage an adjustable screw 25 to limit the stretching of the wire |8 too far, regardless of the condition the wire is shown adjustable by means of a cam having a dial such that the reading on the dial to which it is subjected. may be used directly'to indicate the frequency of the current. ' ' With the device as above constructed in origi nally adjusting the device, it will be clear that 15 when the device stands with the weight I9 at In accordance with the present invention, the the top and with an extending end of the wire same principles are utilized in measuring the fre l8 protruding through the stud N, we may grasp quency of an alternating current but in the in the extending end of the wire I8 and place upon stant case a different method of varying the ten it a weight corresponding to the desired initial sion upon the wire is employed. 20 tension thereof, and then clamp it with a screw It is an object of this invention to provide 30. Thereafter ii the shell I3 is turned through a frequency meter of great simplicity of con any angle from the inverted vertical just de struction and operation which will be rugged and scribed, the tension on the wire will gradually inexpensive, and yet very sensitive. increase because the pull of the weight l9 varies The invention accordingly comprises a device 25 with the cosine of the angle through which it is possessing the features, properties and the rela turned, until the position shown in Fig. 1 is at tion of elements which will be exempli?ed in the tained, in which position the weight l9 will be article hereinafter described and the scope of added to the tension instead of being subtracted from it. the application of which will be indicated in the claims. Mounted upon the end of the shaft l4 upon For a fuller understanding of thenature and one side is a pulley 3|, and mounted upon its objects of the invention, reference should be had outer end is an indicating hand 32, and between to the following detailed description, taken in the pulley and the indicating hand is a ?xed dial connection with the accompanying drawing, in 33. Mounted below the pulley 3| upon the base which: 35 is a bearing 34 carrying a shaft 35, on one end of Fig. 1 is an elevation, partly in section, of an which is a small pulley 36 in alignment with the apparatus embodying this invention, connected pulley 3|, and connected to it by a belt. Mounted to a circuit forming a part of the apparatus. upon the other end of the shaft 35 is a knurled head 31. Fig. 2 is a side elevation thereof to a reduced scale. The lower end of the wire I8 is electrically con 40 Fig. 3 is a section on line 33 of Fig. 1. nected to the shell 20, which is itself electrically Fig. 4 is a section on the line 4-4 of Fig. 1. connected to ground. The upper end of the wire In the drawing the numeral ||l designates a ‘base I8 is connected through a lead 40, a condenser having a pair of uprights || carrying bearings l2, 4|, and a feed back control resistance 4|a, with in which is pivoted a frame l3 mounted on trun the plate circuit 42 of an oscillator tube 43. nions l4. The frame l3 may take the form of Mounted within the shell I3 is an insulator S0 a closed cylindrical casing, although it will be of a height substantially equal to the vibrating understood that this closed casing is severable at portion of the wire l8, and this insulator is cut some point in order to aiiord easy access to the away through its central portion, as shown at 5|, interior for construction and repair. Mounted 50 leaving two arms 52, one at top and one at bot in the center of one end of the shell is an insu tom, between which is stretched an electrode 53; lator l6 carrying a hollow stud II, in which is while a permanent magnet 54 surrounding the fastened one end of a wire l8, the other end of member 50 has its poles disposed on opposite the wire l8 being connected to a weight IS in the sides of the wire l8, so that its lines of force lower portion of the shell. 55 move transverse to the plane de?ned by the wire Above and also below the weight I9 there is I8 and the electrode 53. provided a diaphragm 20 and 2|. The weight I9 The electrode 53 is electrically connected by a is provided with studs 23 and 23 by which it is wire 56 through a condenser 51 to the grid 58 connected to the center of the diaphragms 20 of the vacuum tube above referred to, while means and 2 I. These diaphragms are quite ?exible. 60 are provided to maintain a proper potential upon 2,412,586 4 3 the grid shown in the form of a grid leak resist frame, including means for imposing tension upon ance 59. A potential is imposed upon the elec trode 53 by means of a battery 60 acting through a resistance 6!; and a battery 62 actingthrough a translating device 63 supplies potential to the said wire, even when said frame is rotated to plate 42. With the construction above outlined, it will be seen that as we turn the knurled knob 31, we vary the effect of the weight I!) upon the tension of the wire l8, and thus vary its‘ fre quency, according to the law that the tension at 10 |_¢ from inverted position = initial tension — weight l9 and associated parts X cos ¢. When this device is connected to the oscillating circuit above described, the calibration of the in- _ strument will at all times indicate the frequency 15 of the current maintained by the oscillator. If, however, it is desired to measure the fre quency of an incoming current, the feed back cir cuit from the oscillator may be omitted and the incoming current may be fed through the vi 20 bratable wire. The incoming signal, however, will have no effect upon the vibrating wire until the latter has been brought in tune with it. The instrument may then be turned until the fre quency of the wire is tuned to the incoming fre 25 quency, which will start the wire in vibration. The vibration of the wire will thereupon start the tube 43 in oscillation and this point will be instantly recognizable by the response of the in bring said weight above said wire,‘ an oscillator including means controlled by the vibration of said wire to maintain said wire in vibration, and means to measure the angle through which said frame is turned. 3. A device of the character described compris ing, in combination, a wire, a magnet disposed to have its lines of force transverse to said wire, an oscillator actuated by the movement of said wire and connected to maintain said wire in vi bration, a frame having a diaphragm therein, said wire having one end connected to said frame and the other end to said diaphragm with said wire axially disposed in said frame, a weight car ried by said diaphragm, and means for indicat ing the angle through which said frame is turned. 4. A device of the character described compris ing, in combination, a frame, an upper and lower diaphragm extending across said frame, a wire stretched across between said frame and said up per diaphragm and disposed 'axially in said frame, a weight connected between said dia Dhragms, said frame being rotatable about a hor izontal axis, means for measuring the degree of rotation thereof, an oscillating system including means responsive to the vibration of the wire for determining the period of oscillation, means sup strument connected to the translating device 53 30 plied by said oscillator for passing current through the wire, and a permanent magnet supported by which is used in this speci?cation as typically said frame having its poles disposed onoppo embodying any use to which the alternatingcur rent may be placed either to operate a. visual meter or to perform some electrical function or site sides of said wire, - » 5. A device in accordance with claim 1, in otherwise. These speci?c uses are ancillary to but 35 which the oscillator includes an electrode parallel to the wire connected to the grid of the oscil form no part of the present invention. The in lator, means for imposing electric tension on said strument calibration will then read the frequency electrode, a magnet disposed with its poles on directly. opposite sides of said wire, and a connection for When the instrument is used in this manner, it serves to amplify any component of the incom 40 feeding current through said wire from said os ing wave that is in tune with the setting of the cillator. 6. A device in accordance with claim 2, in which instrument. Since certain changes may be made in the the oscillator includes an electrode parallel to the wire connected to the grid of the oscillator, means above construction and di?erent embodiments of the invention could be made without departing 4.vi for imposing electric tension on said electrode, a magnet disposed with its poles on opposite sides from the scope thereof, it is intended that all matter contained in the above description or of said wire, and a connection for feeding cur rent through said wire from said oscillator. shown in the accompanying drawing shall be in 7. A device in accordance with ‘claim 3, in terpreted as illustrative and not in a limiting which the oscillator includes an electrode parallel sense. to the wire and means for imposing electric ten It is also to be understood that the following sion on said electrode, said electrode :being'con claims are intended to cover all of the generic and speci?c features of the invention herein de neoted to the grid of the oscillator, and con nections for feeding current from said oscillator scribed, and all statements of the scope of the in vention which, as a matter of language, might 55 through said wire. 8. A device in accordance with claim 4, in which be said to fall therebetween. the oscillator includes an electrode parallel to the Having described my invention, what I claim wire and means for imposing electric tension on as new and desire to secure by Letters Patent is: 1. A device of the character described compris said electrode, said electrode being connected to the grid of the oscillator, and connections for ing, in combination, a frame mounted for rotation feeding current from said oscillator through said about a horizontal axis, a wire attached to said frame having its other end connected to a weight, wire. 9. A device of the character described compris means supported by said frame for holding said wire and weight axially disposed in said frame, ing, in combination, a frame mounted for rota an oscillator including means controlled by the 65 tion about a horizontal axis, a wire attached to said frame having its other end connected to a vibration of said wire to maintain said wire in weight, means supported by said frame for hold vibration, and means to measure the angle through which said frame is turned. ' ing said wire and weight diametrically disposed in said frame, means for feeding a current 2. A device of the character described com prising, in combination, a frame mounted for ro 70 through said wire, and a magnet disposed to cause its lines of force to pass transverse to said tation about a horizontal axis, a wire attached to said frame having its other end connected to a weight, means supported by said frame for hold ing said Wire and weight axially disposed in said wire. > ~ - FRANK RIEBER.