US1608218A

US1608218A - Signal horn

Info

Publication number: US1608218A
Application number: US34816A
Authority: US
Inventors: Ludwig P Kongsted
Original assignee: American Bosch Magneto Corp
Current assignee: Ambac International Corp
Priority date: 1925-06-04
Filing date: 1925-06-04
Publication date: 1926-11-23
Anticipated expiration: 1943-11-23

Description

Nov. 23 1926.

L.. P. KoNGsTED SIGNAL HORN Filed June 4, 1925 l 2 1 l Ill .124

dw/'7 P Kon ggg' ATTORNEY Patented Nov. 23, 1926.

UNITED STATES LUDWIG P. XONGSTED, OI' SBINGFIELI), MASSACHUSETTS, ASSIGNOR T0 AMERICAN hosen mannaro eoaroaa'rron, or non or nw roux.

SPRINGFIELD, MASSACHUSETTS, A CORPORA- SIGNAL HORN.

Application med .rune 4, 1925. serial No. 34,816.

In signal horns, particularly intended for automotive vehicles and the like, 1t 1s often desirable to produce a warning signal that is startling by reason of its lugh pitch or .5 ringing tone. This has been done 1n some measure by means of a r1g1d disc fastened centrally of a diaphragm that 1s vibrated by an electroma et, but the mass and therefore the mechanical inertia of the vlbratm. arts are thus increased and also the likellood of the diaphragm to crack or break where it bends within its clamped perlpheral rim. Furthermore, by reason of the rlgid connection between the diaphragm and the disc, the two vibrate synchronously at all times and thereby do not so effectively produce the overtones or thehigh pitch desirable for warning si als.

In accordance wit my invention, two or more sound waves of different frequencies or out of time phase with one another, one or more of the sound waves referabl hav ing overtones, are generate to ro uce a signal of ringing c aracter .capa le of extreme enetration and startllng effect over great istances. To do this, there ma be a plurality of independently supporte dlaphragms which have different natural er1- ods of vibration or are so located relatively that upon simultaneous vibration there is produced a resultant tone made u of fundamental notes and overtones, an also beats if desired, at least one of these diaphragme preferably being a resilient member conslsting either of a resilient diaphragm or a r1 1d member spring-supported to mcrease t e effect. r, any means, such as a siren mechanism or a reed, may be used to pulsate a column of air which acts on a diaphragm, preferably a resilient member, to set 1t 1nto vibration of its own natural period which may be different from the frequency of the air column. I prefer to pulsate the air column by a diagram that is electromagnetically or mechanically vibrated at high frequency, and also to use an independentlysupported resilient member whic substantially but not quite fills the diameter of the sound chamber of the first diaphragm so as to provide a comparatively narrow annulus of open space for the uninterrupted passage ofa small section of the pulsating air column while at the same time absorbing suiicient energy from that column to be effectively set .the waves emanating from into vibration thereby. The two trains of sound waves so generated are then combined inthe horn conduit or other form of sound outlet which is thus open to the diaphragm and also to the resilient member.

In the embodiment in which the independently-supported resilient member comprises a ri id member supported by a reslilient g mem er or a spring spider fastened' to the rigid member and to the casin some of the energy of vibration of the rigi member ma be transmitted to the casing itself; thereby resulting in the generation of additional sound waves in the outsideair directly from the sides of the casing. These sound waves in the radiate in a direction different from the mouth of the conduit and also partially combine therewith in the production of the warning si al.

In the accompanying drawings ilustratmg my invention in application, as an ex ample, to an electromagnetic horn, Fig. A1 is a central longitudinal section, partly 1n elevation; Fig. 2 is a section on line 2-2 of Fig. 1; and Fig. 3 shows the-resilient member in :front elevation.

The housingvconsists of a pressed-metal portion 1, a pressed-metal intermediate portion 2 fastened thereto and clampin the diaphragm 3 and forming the sound c amber 4, and a drawn or rolled steel sound conduit 5 fastened with its neck in telescoped relation to the s out 6 of the intermediate portion. An e ectromagnet having its winding 7 around the middle leg of the T-shaped laminations 8 and electrically connected through the spring-pressed mechanical interrupter 9 to a suitable source of current such as a 6-volt storage battery (not shown), actuates/ a laminated armature l0 to which is rigidly fastened the diaphragm 3 and the push rod 11. The diaphragm 3 is so tensioned as to normally hold the armature 10 away from the poles of the electromagnet and the push rod 11 away from the deflectable lever of the interrupter 9, but when an operating switch (not shown) in the suppl circuit is closed, current flowing through t e winding 7 causes the attraction of the armature 1() toward the poles of the electromagnet until the interrupter 9 is opened. The armature is then pulled back by the diaphragm until the interrupter closes, whereupon the action is rapidly repeated until the operating switch is released by the o rator.

The vi ration of the diaphragm 3 causes a pulsation of the air column in the sound chamber 4. A large part of that air column gives up its ener in acting upon the disc 12, which vis ma e of a light rigid material as aluminum or magnesium and which is fastened centrally by the riveted stud and nut 13 to a spring spider 14. Since this spider is riveted at 15 to the liousin the disc 12 is then free to vibrate indepen ently of the diaphragm 3 and therefore, upon being vibrated by the air column intercepted by it, generates sound `waves of a frequency that may be diierent from those generated by the diaphragm 3, de ding upon the natural period of vibration of the disc 12 with its spring support 14. Owing tofthis spring mounting, overtones as well as fundamental notes are erated by the disc 12. However, the ringing character of the signal so produced is increased by reason of the fact'that the sound waves generated Vby that part ofthe diaphragm 3 ogposite the free annular space'between the ousing ortipn 2 and the rim of the disc 12 pass by t e disc and combine in the conduit 5 with the, sound waves generated by the disc. The result is the production of a signal having fundamental tones and overtones, and beats if desired that give a startling signal of a ringing and enetrating character particularly eiective or vehicles. It is obvious that the tone may be varied b changing the longitudinal separation of t e disc 12 and diap ragni 3, and the diameter of the disc 12, and also by culpping or otherwise changing the shape cr t e natural period of vibration of the disc. 12 with its spring 14 forming the resilient member.

As a result of the connection of the spider 14 to the diaph 12 and the portion 2 forming a part o the casing, some of the energy of vibration of the diaphragm 12 is transmitted directly to the casing which then generates additional sound waves that radiate from the casing in a direction diferent from that of the waves from the mouth of the conduit 5.

Having thus described my invention, what I claim is:

l. In a signal horn, a plurality of vibratile diaphragms independently supported for vibration at individual fre uencies, means for simultaneously vibrating said diaphragms, and a sound outlet open to said diaphra ms for combining the sound waves produce thereby into a resultant warning si nal.

g2. In a signal horn, a plurality of vibratile diaphragms inde endently supported for vibration at indivi ual frequencies having diierent natural periods of vibration, means for simultaneously vibrating said diahragms, and a sound outlet open to said iaphra for combining the sound waves produce thereby into a resultant warning signal.

3. In a signal horn, a lurality of vibratile diaphragme of whic at least one is a resilient member, said diaphragme being independently supported for vibration' at individual frequencies, means for simultaneously vibrating said da hragms, and a sound outlet open to said diaphragme for combining the sound waves produced thereby into a resultant warning signal.

4. 1n a signal horn, a sound chamber, a plurality of vibratile diaphra s independently-supported in said soun chamber for vibration at individual uencies, means for simultaneously vibrating said diaphragms, and a sound outlet open to said diaphr s for combining the ysound waves produce thereby into a resultant warning signal.

5. In a signal horn, a vibratile diaphra m, means for vibrating said vibratile 'aphragm to produce pulsations of an air column, a second vibratile diaphragm mounted independentl of the rst for vibration at its natura frequenc 'and arranged to be vibrated by the p sating air column produced by the vibration of the rst diaphragm, and a sound outlet open to both diaphragme for `combining the sound waves produced thereby into a resultant warnin signal.

6. In a signal horn, a diaphragm, means for vibratin said dia hragm to produce pulsations o an air co umn, and a second diaphragm mounted independently of the first dia hragm 'in the sound chamber thereof, t e second diaphr substantially but not quite filling the iameter of the sound chamber.

7. In a signal horn means for pulsating an air column, an independentl -siipported member inter osed in the path o the air column so as to vibrated thereby at its natural frequency, and a sound outletopen to said pulsating air column and also to said member for combining sound waves of the air column and of the member into a resultant warning signal.

8. In a signal horn, means for pulsatin an air column, and a spring-su ported rigi member interposed in the pat of the air column so as to be vibrated thereby.

9. In a signal hornz a vibratile dia phragin, means for vibrating said diaphragm, a sound conduit, a member located in the conduit and supported independently of the diaphragm for vibration at its natural fr uency, and a sound outlet open to the diap ra and also to said member for combining t e sound waves produced thereby into a resultant warning signal.

10. In a signal horn, a sound conduit, a

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Vibratile diaphragm peripherally supported by the conduit, means for vibrating sald diaphragm, a member located in the conduit and supported thereby, and a sound outlet in air communication with the diaphragm and also with the member for combining the sound waves produced thereby into a resultant warning signal.

11. In a signal horn, a, diaphragm, means for vibrating the diaphragm, a sound conduit, and a spring-supported rigid member located in the conduit and supported independently of the diaphragm.

12. In a signal horn, a Vibratile diaphragm, means for vibrating said diaphragm, a sound chamber in front of the diaphragm, a member located in the sound chamber and supported independently of said diaphragm for vibration at its natural frequency, and a sound outlet open to said diaphragm and also to said member for combining the sound waves produced thereby into a resultant warning signal.

13. In a signal horn, a diaphragm, means for vibrating the diaphragm, a sound chamber in front of the dlaphragm, a sound con- -duit leading from the sound chamber, and

a rigid disc spring-supported in the sound chamber independently of the diaphragm, said disc having a diameter less than that of the sound chamber but greater than that of the neck of the conduit.

14. In a signal horn, a casing, means for pulsating an air column within the casing, a rigid member interposed in the path of the air column so as to be vibrated thereby, and a resilient sup ort fastened to the rigid member and to t e casing.

15. In a signal horn, a casing, a diaphragm in the casing, means for vibrating said diaphragm, a rigid disc in front of said diaphragm, and a spring spider fastened centrally of the disc and to the casing.

rIn testimony whereof I ailix my signature.

LUDWIG P. KONGSTED.

1,eos,21s

vibratile diaphragm peripherally supported by the conduit, means for vibrating said diaphragm, a` member located in the conduit and supported thereby, and a sound outlet in air communication with the diaphragm and also with the member for combining the sound Waves produced thereby into a resultant Warning signal.

11. In a signal horn, a diaphragm, means for vibrating the diaphragm, a sound conduit, and a spring-supported rigid member located in the conduit and supported independently of the diaphragm.

12. In a signal horn. a vibratile diaphragm, means for vibrating said diaphragm, a sound chamber in front of the diaphragm, a member located in the sound chamber and supported independently of said diaphragm for vibration at its natural frequency, and a sound outlet open to said diaphragm and also to said member for coinbining the sound Waves produced thereby into a resultant warning signal.

13. In a signal horn, a diaphragm, means for vibrating the dia hragm, a sound chamber in front of the diaphragm, a sound conduit leading from the sound chamber, and

14. In a signal horn, a casing, means for pulsating an air column within the casing, a rigid member interposed in the path of the air column so as to be vibrated thereby, and a resilient support fastened to the rigid member and to the casing.

15. In a signal horn, a casing, a diaphragm in the casing. means for vibrating said diaphragm, a rigid disc in front of said diaphragm, and a spring spider fastened centrally of the disc and to the casing.

rIn testimony whereof I ax my signature.

LUDWIG P. KONGSTED.

Certificate of Correction. It is hereb certiiied that in Letters Patent No. 1,608,218, granted November 23,

1926, upon e application of Ludwig P. Kongsted, of Springfield, Massachusetts.

n 1m rovement in Si al Horns, errors appear in the printed specification fguziring l:orrection as follgorvivs: Page 1, line 44, for the word diagram f read da hrag'm; line 62. for the misspelled Word resiilient read remlnt; line 70, stri e out the words in the, and line 90, for T-shaped read E-sliapef; and that the said Letters Patent should be read with these corrections therein that the same ma conform to the record of the case in the Patent Oilice.

Sign

and sealed this 28th day of December, A. D. 1926.

M. J. MOORE, Acting Oommss'ioner of Patents.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,608,218, granted November 23, 1926, upon the application of Ludwig P. Kongsted, of Springfield, Massachusetts. for an improvement in Signal Horns, errors appear in the printed specification requiring correction as follows: Page 1, line 44, for the word diagram read da hragm; line 62, for the misspelled Word resiilient read resilient; line 70, strilxe out the words in the, and line 90, for T-shaped read E-ahaped; and that the said Letters Patent should be read with these corrections therein that the same ma conform bo the record of the oase in the Patent Ove.

Sign and sealed this 28th day of December, A. D. 1926.

' M. J. MOORE,

Act'mg Uomma'sswowr of Patents.