US2486679A - Diaphragm type electromagnetic signal device - Google Patents

Description

Nov. 1, 1949. P. c. RECK DIAPHRAGM TYPE ELECTROMAGNETIC SIGNAL DEVICE Filed Jan. 8, 1947 ai 6 28. 6% //7 yc-vvfor A Patented Nov. 1, 1949 DIAPHRAGM TYPE ELECTROMAGNETIC SIGNAL DEVICE Peter 0.. Beck, Adrian, Mich., assignor, by mesne assignments, to ,Sperti Faraday Inc., a corporation of Ohio Application Januar 's, 1947, Serial No. 720,798

1 Claim. 1

This invention relates to vibratory diaphragm type" of electric signalling means.

This invention has utility when incorporated in sound generating devices of the electric horn type. The assembly is in a rugged compact unit with a yieldably mounted actuator in conjunction with an adjustable control therefor.

Referring to the drawings:

Fig. 1 is a front view of the unit assembled in a projectorless horn;

Fig. 2 is an enlarged view of the horn of Fig. 1, from the back or mounting side thereof, a portion being broken away;

Fig. 3 is a still further enlarged view of a fraction of the unit from the left of Fig. 2;

Fig. 4 is a fragmentary view from the right of Fig. 3, showing the yieldable mounting for the coil and the adjustment for the spring tongue of the breaker switch;

Fig. 5 is a partial side elevation of the unit of Fig. 2, broken away to show the circuit breaking switch in side elevation; and

Fig. 6 is a wiring diagram of the electric circuit for the unit.

The electric circuit Electric current supply lines I, 2, extend to terminal-s 3, 4, on a fiber insulator block 5. From the terminal 3, a lead line 6 extends to a condenser I, and in parallel therewith is a conductor line 8 to a coil 9 having an electromagnet core III. From the terminal 4 a line II extends to a terminal I2 having an insulation mounting I3. From the mounting I3 is a stirrup I4 to a riser free end I5 having an insulation assembly IS with an adjusting means H. The intermediate drop portion of the stirrup I4 has a switch terminal I8 normally in contact with a terminal I9 of a spring tongue 20 having an insulation mounting 2 I.

The circuit from the terminal I 2, thru the stirrup I4 to the closed switch I8," I 9, is to the tongue 20. Therefrom it is completed by a lin 22 to the coil 9. In parallel with the coil 9 between the terminal 3 and the tongue 20, is the condenser I having toward the terminal 3 the line connection 6 and toward the tongue 20 a line connection 23.

The enclosing mounting A resonance transmitting wall 24, in a building, vessel or plane, engaged by screws 25, may mount a support or flange 26 having rivet connections 21 with a flare shell orhousing 28 terminating in a ledge 29.

The yieldable mounting for the electromagnet Ears 33 are diametrically opposed and inward from the flange 26, carry screws 3I to engage outwardly extending springarms 32, assembled by a Mounting and enclosing the diaphragm In lieu of a projector, a perforate shield 49 may have screws 4I pass therethru to locate concentrically therein an insulation ring 42 against a diaphragm disk 43. The screws M, in passing thru the. diaphragm 43, pull the edges of the diaphragm against the outer or rim portion of the base 31, to pack a felt or compressible packing 44 against the ledge 29 as crowded theretoward by a flange 45 of the facing plate or shield 40. This provides a cushioning connection from the mounting flange 26 in the reverse way thereto than from the arms 32.

The operation of the circuit breaking switch Centrally of the diaphragm 43, there is an insulation disk 46 from which extends an armature or hammer action element 4! toward the fixed core II] in the coil 9. While the core I0 is fixed with the coil 9, the whole electromagnet assembly between the arms 32 and the cushioning at the ledge 29, is a vibration dampened mounting. As a switch 48 is closed to cut in an electric current supply, the energized coil 9 overcomes the spring 20 to open the circuit.

The energized coil 9 causes the magnet or core I9 to serve as an actuator for the armature 41, thereby to flex the diaphragm 43 as peripherally held. In this flexing, the insulation disk 46 rides against the free end of the leaf spring or tongue 20 to move it toward the coil 9. This shifts the contact I9, fixed with the tongue 20, away from the contact I8, fixed with the stirrup I4. The actuator operation is thus resisted, not only by the spring of the diaphragm 43, or the resilience therein, but by that of the tongue 29. The single end adjustment means I! may so locate the terminal I9 again-st the supplementary contact terminal l9 that the opening of this normally-closed box cover plate, or even against the inside wall of a submarine. The 725 cycle frequency develops sound values of 105 to 110 decibels at a distance of 3 ft.

In the general structure as disclosed, the current supply for energizing may be either alternating or direct, and with the voltage even up to 120 volts.

What is claimed and it is desired to secure by Letters Patent is:

An electric signal device adapted to be mounted on a resonant building structure, said device comprising a support, a coil, a core for the coil, a diaphragm, an armature mounted on the diaphragm, a housing extending from the support and about the coil and providing peripheral yieldablc con-' 4 nection for positioning the diaphragm with the armature in normal spaced proximity from the core, a switch including a contact operated directly by the movement of the diaphragm-carried armature relatively to the coil, a frame mounting th switch independent of the diaphragm, yieldable arm means from the support, and means anchoring the arm means, frame, coil and core as a unit sufilciently fixed to hold normal signal device movement relatively to the support.

PETER C. RECK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS White Oct. 20. 1942

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