Патент USA US2410805код для вставки
Nov. 12, 1946. R. BLACK. JR 4 2,410,805 VIBRÀTION DETECTOR ‘ Filed Jan. 16, 1942 F76 _.'\?`_\. F 5 IG. 29' f/ao 75 90 RFC.E5QU.NCY- _ Patented Nov. 12, 1946- 2,410,805 >UNIT-ED STATES PATENT OFFHCE 2,410,805 VIBRATION DETECTOR Robert Black, Jr., South Orange, N. J., assignor to Bell Telephone Laboratories, Incorporated, New York, N. Y., a corporation of New York Application January 16, 1942, Serial No. 426,989 3 Claims. (Cl. 177-386) . 1 2 . This invention relates to vibration detectors Fig. 1 is a side view of a vibration detector em and, more particularly, to such detectors used in a liquid medium, for example, water, in the de- tection of noises, signal waves or other'under water disturbances. An object of the invention is to provide an inexpensive, small and eilicient detector of under water vibrations. bodying the invention; Fig. 2 is an end View of the device of Fig. l; Fig. 3 is a cross-sectional view, enlarged, of the device of Figs. 1 and 2 taken along the lines 3_3 of Fig. 2', Fig. .4 is another cross-sectional view of the de vice of Figs. 1 and 2 taken along the lines 4_4 of Another object is to detect efñciently under Fig. 3; water vibrations with an inertia-type transducer, 10 Fig. 5 is a View in perspective of the inertia device or unit. type transducer, device or unit incorporated in A feature of the invention comprises complete the device of Figs. l and 2; and ly surrounding an electromechanical transducer, Fig. 6 illustrates the response characteristic of device or unit for use in a, liquid medium, such the device of Figs. 1 to 5 for vibrations incident as water, with a body of ñexible, elastic or resil 15 normal to the cylindrical surface thereof. ient material. . The vibration detector H00 of Figs. l to 5 is in tended and adapted for the detection and trans Another feature comprises detecting under Water vibrations with an inertia-type device or lation into an electric current of submarine sig naling waves or other under-water disturbances resilient material, such as a soft rubber, intimate 20 or vibrations. It embodies an inertia-type elec ly adherent to the unit. tromechanical transducer, device or unit substan A further feature comprises an arrangement tially the same as the telephonie device disclosed for protecting the detector unit against water in M. S. Hawley United States Patent No. unit embedded in a body of ñexible, elastic or ' diffusion through the elastic body in which it is 2,202,906 of June 4, 1940, the principal diiferences embedded. 25 being that the device l0 herein includes a pair of In accordance with the invention, an inertia set screws 50 threading through the pole-pieces type electromechanical transducer, device or unit I3, I4 and bearing at their rounded ends on the is embedded in ka body of flexible, elastic or resil spider memberl@ to enable adjustment of the air ient material, such as a soft rubber. The trans gap between the armature 23 _and the pole faces ducer preferably comprises a container or case 30 of the arms l5, i6 of the pole-pieces; and in that of relatively inflexible material to the cuter 'sur-, the long or longitudinal edges 29’ of the cover 20 face of which the elastic material is intimately of the unit I0 herein, slope or are contoured at adherent. The body of flexible material may an angle of approximately 45 degrees with respect have a geometrically symmetrical outer surface to the outer surface of the cover. More specifical and, in a preferred embodiment, this outer con 35 ly, the device l0 herein comprises a pair of bar tour may be cylindrical in character. Terminal permanent magnets Il, l2; a pair of U-shaped members are supported at the ends of the cylin pole-pieces i3, Id whose inner arms l5, I6 are sur drical body, and conductors are embedded in the rounded by and support current coils l1, I8; an elastic material for connecting the transducer armature 23 fastened to and supported by a spider with the terminals. In order to protect the trans 40 member 20, the spider member being secured to ducer against the effect of possible water diffusion the outer arms of the~ pole-pieces by screws 2l, through the elastic body, the latter is enclosed in 28, spacer members or washers 25, 26 being in a thin metallic sleeve or shield, the ends of which terposed between vthe spider member and the project beyond the ends of the elastic body where pole-pieces. The magnet structure and the by rigid, cup-shaped metallic members may be at 45 spider are enclosed by a case or container com tached thereto. The electromechanical trans prising casing 30 of relatively inflexible material ducer may be an inertia-type bone conduction re ceiver such as has been disclosed in M. S. Hawley such as a plastic, and a 'cover member 29 of simi will be evidenced by, and a more complete under bushings embedded in the cover. The coils il, I8 may be connected in series, their free ends lar material, being fastened to and supported ' Patent No. 2,202,906 of June 4, 1940. solely by the cover member, the fastening means Other objects and features of this invention A50 comprising screws 3| threading into tapped standing of it will be derived from, the detailed description that follows, taken in conjunction w" h the showing of the appended drawing, where mi - being brought out to spring terminals adapted to be engaged by pin or plug connectors 00. The 55 davide l0 is embedded in and completely sur 2,410,805 4 3 rounded by a body 10 of flexible, elastic or re silient material, such as a soft rubber, the body nested through suitable conductors with the ter 1|! being of an elongated, geometrically symmet rical configuration, in the particular embodi ment, cylindrical in outer contour with planar The elastic material may be such that the product of its density and the velocity of originating from the directions faced by the cy lindrical surface of the vibration detector, the response characteristic will have the general shape shown in Fig. 6. The vibration detector propagation through it is substantially equal to perature about 38° F. The abscissa is in cycles per second, the ordinate is open circuit voltage at minals 90. For vibrations, waves or disturbances was located at a depth of ten feet in water of tcm that of the liquid medium in which the device ||1|l is to be used. 'I'he material of the body 10 is 10 the terminals in decibels down from one volt per dyne per square centimeter. The signal source intimately adherent to the relatively inflexible casing and cover of the device ||l, being vul was at a distance of onehfoot. The device |00 dis canized therearound. The elastic body is en crimlnates against waves, vibrations or disturb ances originating from a direction faced by the closed in a thin metallic shield or sleeve 80 whose end portions 8| project beyond the planar ends 15 ends of the elastic body. of the elastic body. This shield may be of elec trotinned brass approximately .005 inch in thick ness. Relatively rigid cup-shaped metallic mem bers 15 are inserted Within the projecting ends of the sleeve, are fastened thereto, for example, 20 by solder, and bear against the planar ends of the elastic body. A terminal member 90 is sup ported on an insulator member 9| at each end of the elastic body, and is connected by a bare The vibration detector described with reference to the appended drawing may be included with a plurality of similar vibration detectors in a cable included in a submarine signal or vibration detecting or locating system. A specific vibration detector constructed in accordance with this in vention was quite small and compact being of the order of less than one inch in outer diameter and approximately three inches in length. Although this invention has been disclosed with wire or conductor 92, 92’ with the plug or con 25 nectors 60. The wires 92, 92’ are brought out to reference to a specific embodiment thereof, it their respective terminals through a glass bead will be evident that it is not limited thereto, but 93 supported in the tapered end of a. copper sleeve is of a scope evidenced by the appended claims. What is >claimed is. . 94, the enlarged end 95 of which is spun over to 1. A vibration detector comprising a unitary firmly grip the insulator member 9|, and is sol 30 assembly comprising a container including a. hol dered to the member 15. The glass bead-copper sleeve provides a water-tight seal for the con low case of relatively infiexible'material and a ductors, the elastic body being intimately adher cover of similar material for said case, and an ent to the outer surfaces of the glass bead and electromechanical transducer within said case 35 and supported solely from said cover, and a body copper sleeve. of soft rubber completely enclosing said container It will be observed that the unit l0 is a sub stantially regular geometrical body of relatively and intimately adherent to the outer surfaces of said case and cover. greater length than either width or thickness, and that the elastic body is of substantially reg 2. A vibration detector comprising an inertia ular geometrical configuration of considerably 40 type electromechanical transducer including a greater length than diameter, the lengthwise di case of relatively inflexible material, a body of mension extending inithe same direction as the relatively flexible material completely surround lengthwise or longitudinal dimension of the de ing said case and intimately secured thereto, said body having a cylindrical outer contour, a thin vice |0, with the thickness of the elastic body material along the long or lateral surfaces of the 45 metallic sleeve attached to and surrounding said unit l0 being small compared to the elastic body body, a relatively rigid cup-shaped member at material thickness at the ends of the device I0. each end of said body secured to the latter and When the vibration detector described is sub- l fitting within the ends of said sleeve, a terminal merged in a liquid medium, 'the sleeve 80 pro member within each of said rigid members, and tects the device l0 against. water diffusion 50 conductors embedded in said body and connecting through the elastic body. The sleeve 8|] also acts said transducer with said terminals. to transmit signal waves, vibrations or other dis turbances incident thereon to the device I0 3. A vibration detector comprising an inertia type electromechanical transducer including a through the material of the elastic body. The case of relatively iniiexible material, a body of vibrations so transmitted will vibrate the de 55 relatively flexible material completely surround vice IIJ, and the relative movement of the arma ing said case and intimately secured thereto, a ture 23 and the pole-pieces |3, I4 will result in thin metallic sleeve attached to and surrounding a variation in the reluctance of the magneticA said body, a relatively rigid, closure member at circuit constituted by the permanent magnet, each end of said body secured to the latter and pole-pieces and armature, which variation' in re 60 fitting within the ends of said sleeve, a terminal luctance causes a variation in the magnetic flux member attached to each of said rigid members, in the circuit, whereby currents corresponding to and conductors embedded in said body and con the vibration are induced in the coils l1, I8. necting said transducer with said terminal. ` These currents may be detected by suitable indi cating or recording equipment (not shown) con 65 ROBERT BLACK, Jn.