US2070628A - Sound producing apparatus and mounting therefor - Google Patents

Description

Feb. 16, 1937. A. M. SKUDRE SOUND PRODUCING APPARATUS AND MOUNTING THEREFOR Filed Feb. 26, 1935 INVENTOR.

ARNOLD M.SKUDRE ATTORNEY.

' "Patented'Feb. is, 1937 ATEN l FECE SOUND PRODUCING APPARATUS AND MOUNTING THEREFOR Arnold M. Skudre, San Francisco, Calif., assignor to Submarine Signal Company, Boston, Mass.,

a corporation of Maine Application February 26, 1935, Serial No. 8,335

3 Claims.

sels in which there is difficulty of cutting anopening in a vessel. This applies perhaps more especially to wooden ships and to apparatus that is used in depth sounding where a beam of highfrequency compressional waves is produced.

Particularly in wooden vessels it is very difficult to cut an opening in theves'sel and insert a submarine sound projector or an oscillator and seal the device in such a manner that it is watertight. While it is possible to accomplish this, nevertheless great precautions must be taken and the expense of installation is very high. In addition, it frequently happens that the installation will not remain watertight even if special precautions are taken. This may perhaps be due to the use of different materials with different elastic properties in the sound-producing apparatus and in the vessel, and it is also due no doubt to the shape and size of the apparatus that is installed.

In'the present invention the installation is a so-called keel-mounting type but is attached in r such a manner to the vessel that the only opentageously received from a downward direction.

The oscillator is also preferably arranged lengthwise or longitudinally with the keel so that the beam will spread perpendicular to the keel or in the directionof the roll of the vessel.

The invention will be more fully described in connection with the drawing in which Fig. 1 shows a section through the lower part of the keel where the oscillator is placed; Fig. 2 shows a side view moving from the left of Fig. 1; Fig. 3 shows a modification of a detail shown in Fig. 2; Fig. 4 shows a sectional view from the end of the keel of the modification shown in Fig. 3; and Fig. 5 shows a broken section on the line 55 of Fig. 1.

In Fig. 1 the wooden hull is represented as I with the keel projecting from the bottom as indownward and running longitudinally of the keel. The oscillator is provided with two recessed portions 6 and l in which are positioned the bolts 8 and 9 which pass through the keel 2 and are held fast on the other side by means of the nuts l holding the washer ll against the keel. The recessed portion 1 is filled with cement 30 to cover the bolt heads and complete a flush surface with the outside of the oscillator.

The oscillator itself is provided with a frame l2, as indicated in Fig. 5, at one end of which there is provided means for conducting the cable to the inner casing l3 in which the energizing mech anism is maintained. This means positioned at the end of the frame comprises two chambers it and IS with a wall partition it between. The

' chamber It has a flange I 1 coming out flush to the side edge of the oscillator frame, and the chamber i is also closed at its external side by a surface !8 flush with the side of the oscillator and by a cover plate l9 which is threaded into the side walls of the chamber [5.

The conducting cable 20 enters from the chamber it through a stufling box 2! into the watertight chamber if: from whence it enters the part of the oscillator where the generating mechanism is. The cable 20 enters from the top of the oscillator through the opening 22, as indicated more clearly perhaps in Fig. 1. The cable. is protected by a cover 23 which may be nailed to the side of the keel as indicated by the nails 24.

As shown in Figs. 1 and 2 this protecting shield extends upward to the side of the vessel where the cable passes through a hole 25 into the interior of the vessel, a watertight joint being provided by the stufhng box 26 at the inside of the vessel. It will be noted from the description above that no external cables are provided, and that the entire installation is effected simply by two holes drilled through the keel itself and. not into the vessel. It is quite obvious that the expense involved in such an installation is very insignificant and that it can be accomplished in a. very short time at favorable opportunities such as when the vessel is docked.

In Figs. 3 and 4 there is shown a modification of the installation otherwise shown. The oscillator frame 21 is provided with an upwardly extending flange 28 contacting with the side surface of the keel. This upwardly extending flange furnishes a pressure element for any force that may strike the bottom of the oscillator.

It will be noted that in the operation of the device the oscillator extending longitudinally of the keel and having a surface which is large in its length as compared with the wave length of the frequency produced, will produce a beam of compressional waves of a fan type which will extend out sidewise of the vessel and will, therefore, direct a beam downward regardless of the roll of the vessel. In this way the operator may be assured that the impulse transmitted will be received on the receiver which may, of course,

' the oscillator having an open side facing the keel, means bolting said oscillator to said keel through said web portion and means providing electrical connectingelements through said web from said chamber.

2. In combination with a wooden keel of a vessel, a high-frequency compressional wave oscillator having a casing and a diaphragm formed at one side thereof, said casing being elongated and. having extending at the end thereof a web element, said web element being normal to the surface of the diaphragm and said diaphragm being adapted to face in a downward direction, said web element forming with the walls of the casing a compartment, means providing electrical connections through said compartment and through said web element to the interior of the casing and bolt means holding said casing to said keel, said bolt means passin through said web and said keel.

3. In combination with a wooden keel of a vessel, a high-frequency compressional wave oscillator having a casing with an elongated diaphragm positioned on one face of the casing, said casing having a side edge normal to the diaphragm and adapted to fit flush with the keel of the vessel, means provided at each end of said casing for holding said casing to the keel, said means including as a part of the casing a web element positioned normal to the diaphragm at the ends of the casing and substantially spaced from the side surface adapted to abut the keel, a bolt passing through each web into the keel of the vessel and means covering said bolt and forming a continuous surface at the side opposite the one abutting the keel.

ARNOLD M. SKUDRE.

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