US1336497A

US1336497A - Edward c

Info

Publication number: US1336497A
Authority: US
Publication date: 1920-04-13
Anticipated expiration: 1937-04-13

Description

E. C. WOOD.

RECEIVER MOUNTING FOR SUBMARINE SIGNALS.

APPLICATION FILED MAY 1.8., I.9I8

menwaApr. 13,1920.

2 SHEETS-SHEET 1.

Patented Apr. 13, 1920.. r

2 SHEETS-SHEET 2.

nHQMI "UNTTED sTnTns PATENT OFFICE.

EDWARD C. WOOD, OF SOMERVILLE, MASSACHUSETTS, ASSIGNOR TO SUBMARINE SIGNAL COMPANY, OF PORTLAND, MAINE, A CORPORATION OF MAINE.

I RECEIVER-MOUNTING- FOR SUBMARINE SIGNALS.

Application filed May 18, 1918.

To aZZ whom t may concern:

Be it known that I, EDWARD C. WOOD, of

Somerville, in the county of Middlesex and State of Massachusetts, a citizen of the United States, have invented a new and useful Improvement in Receiver-Mountings for Submarine Signals, of which the follow ing is a specification.

A microphone installed on board ship to receive signals or sounds is subject not only to the influence of those sound waves approaching it from outside the ship but also to vibrations originating on shipboard. Thus at the receiving station, say the pilot house, there is apt to be confusion between those sounds which it is intended to receive and those which may be called immaterial., f. c., those which, originating at the receiving station, convey no intelligence to the observer. He is intent on analyzing or receiving sounds or signals from a distance and his work is confused by sounds otherwise originating.

I shall describe my inventionl with relation to shipboard installation, but I do not mean to limit it thereto as it may be otherwise used. It relates to a mounting of a microphone, such that not only are the undesirable lateral vibrations largely eliminated, but the microphone vibrations are amplified.

My invention will be understood by reference to the drawings in which it is shown in its preferred form;

Figure l being a horizontal section of a mechanism embodying my invention, and

Fig. 2 a section on line 2 2 of Fig. l.

A is a plate which may be part of the skin of the ship, preferably a portion of the side thereof, A1 being the usual ribs. B a heavy metallic inertia ring which is bolted to the ribs by bolts b. It may be otherwise or additionally attached if thought best. C is a heavy cast iron ring carrying supports c for knife edges Z or the like projecting laterally from a reed or other vibrator D. Hence it is convenient to call the ring C an anvil. The supports c, c are preferably threaded and screw into the anvil so as to be adjustable. Between the anvil Specification of Letters Patent.

Patented Apr. 13, 1920.

semi No. 235,377.

C and the ring B is a gasket E preferably a soft rubber ring of such size and character as to serve as an acoustic insulator between the two parts and so reduce to a minimum the communication of vibrations between B, which is attached to the ship, and the parts attached to C as well as C itself. The supports may be flat on their upper surface as shown in one instance or may be grooved as at 01 or otherwise as thought best.

TWhen the apparatus is in position the reed or its equivalent D is attached to the plate A by a wire F, preferably by a screw eye a which is held in place by a set nut al, the upper end of the wire being attached to a second screw eye Z1 having a somewhat longer shank, which is held in place by set nuts (Z2, (Z2, the whole being arranged to hold the knife edges Z firmly on their seats so that the reed will vibrate in phase with the plate A.

The upper end of the screw eye Z1 holds a core, preferably in the form of a cup, Gr which as shown is threaded to it and rests against the upper nut Z2 so that it also vibrates with the reed D, and around this cup, which is preferably made of aluminium, is wound a coil H of insulated wire the ends of which are connected with binding posts it which in turn are connected by wires h1 with a source H1 of direct current.

The binding posts /L are mounted in an inverted U-shaped strap J which is attached by screws j to the anvil C, said binding posts being insulated from the strap J by sleeves and washers jl of insulating material.

To the strap J is also attached, though insulated therefrom, one member K Vof the microphone, the other member K1 of which is attached by the screws Z to a plate L which forms the end of a copper tube'Ll which is of slightly smaller diameter than the cup G so that it may vibrate freely within it, and which forms a secondary to the coil H. The leads Zo of the microphone are connected to a telephone receiver or other indicator and a source of current in the usual manner. M is a cover bolted to the ring B with a rubber gasket in it to make it watertight.

. In practice compressional waves actuate the plate A and its vibration actuates the reed D which is preferably tuned, and the cup G, and sets in vibration the coil H through the instrumentality of the cup G around which the coil H is tightly wound.

The coil H produces a magnetic flux which acts uponthe copper tube L1 causing it to vibrate and energize the microphone.

The instrument should be highly eiiicient as it will not be aiected by lateral vibrations or any other vibrations than those substantially normal to the plate A, but to this end the attachment should be absolutely rigid. While the etliciency of the couple between H and K1 may be low, there is a considerable gain in the couples between A and D and hence the eiiiciency of the apparatus as a whole will give extremely good results.

It is believed that an apparatus of this character is absolutely new and hence l do not mean to connue myself to the exact embodiment of my invention shown in the drawings and above described.

liVha't 1 claim as my invention is:--

l. The indicator mounting above described comprising a compressional wave-receivino` member, a vibrating member connected thereto, an indicator, a transformer one member of which is connected to said vibrating member, the other member being mounted to vibrate and connected to said indicator, and connections whereby one member of said transformer may be electrically energized.

2. The microphone mounting above described comprising a compressional wave receiving member, a vibrating memberconnected thereto and acoustically insulated therefrom, a direct current circuit operatively mounted on said vibrating member and comprising a coil, a secondary mounted to vibrate located within said coil, and a microphone and its connections, one member of said microphone being mechanically connected to said secondary to vibrate therewith. Y

3. The microphone mounting above described comprising a compressional wave receiving member, a vibrating member connected thereto, a core mounted on said vibrating member, a coil wound around said core and forming part of a direct current circuit, a secondary mounted to vibrate located within said coil, and a microphone and its connections, one member of said microphone being mechanically connected to said secondary to vibrate therewith.

Y 4l. The microphone mounting above described comprising a compressional wave receiving member, a vibrating member connected thereto, a core of magnetic material mounted on said vibrating member, a coil forming part of a direct current circuit and` adapted to move with said core, a secondary mounted to vibrate located within said coil, and a microphone and its connections, one member of said microphone being mechanically connected to said secondary to vibrate therewith.

5. T he microphone mounting above described comprising a compressional wave receiving member, a vibrating member connected thereto and acoustically insulated therefrom, a core mounted on said vibrating mounted on said vibrating member, a coil forming part of a direct current circuit and adapted to move'with said core, a secondary mounted to vibrate located within said coil,

land a microphone and its connections, one

member of said microphone being mechanically connected to said secondary to vibrateV therewith.

7. ln a device of the kind described, a compressional wave receiving member, a vibrating member and a microphone one member of which is connected to said vibrating member, and means for connecting said receiving member and said vibrating member comprising an anvil, an acoustic insulator located between said anvil andsaid receiving member, said anvil beingV provided with means to support said vibrating member at nodal points and said vibrating member being attached to said receiving member to be vibrated thereby.

8. In a device of the kind described, a compressional wave receiving member, a vibrating member and a microphone one member of which is connected to said vibrating member, and means for connecting said receiving member and said vibrating member comprising an anvil, an acoustic insulator located between said anvil and said receiving member, said anvil being provided with n'leans to support said vibrating member at nodal points and saidvibrating member-being attachedfto said receiving member to be vibrated thereby, said anvil and said receiving member being acoustically insulated vfrom each other.

A microphone mounting comprising a receiving member, an inertia member connected thereto, an anvil, means located between said anvil and said inertia member whereby the vibrations of said inertia member will be insulated from said anvil, and a microphone one member of which is connccted to said receiving member and said anvil.

l0. That method of receiving at an indicator compressional Waves coming from a desired direction, which consists in causing one member of a transformer to be vibrated by said Waves in a line parallel With said direction, whereby the electrical energy due to the transformer action may be collected on an indicator, and absorbing the vibral0 tions or other compressional Waves before they reach the transformer.

EDWARD C. WOOD.