US2787786A - Sound producers - Google Patents

Sound producers Download PDF

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Publication number
US2787786A
US2787786A US364734A US36473453A US2787786A US 2787786 A US2787786 A US 2787786A US 364734 A US364734 A US 364734A US 36473453 A US36473453 A US 36473453A US 2787786 A US2787786 A US 2787786A
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United States
Prior art keywords
disc
diaphragm
vibratory
center
sound
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Expired - Lifetime
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US364734A
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Zeininger Gustav
Issler Jorg
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K1/00—Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs
    • G10K1/06—Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs the resonating devices having the shape of a bell, plate, rod, or tube
    • G10K1/062—Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs the resonating devices having the shape of a bell, plate, rod, or tube electrically operated
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/18—Details, e.g. bulbs, pumps, pistons, switches or casings
    • G10K9/20—Sounding members

Definitions

  • the invention relates to a sound producer having a diaphragm which is set vibrating by periodic power impulses and which is connected centrally with a substantially even circular vibratory disc, more particularly to a signal horn for mechanically propelled vehicles.
  • the effect of a vibratory disc on the strength and audibility of the sound waves emitted may be improved in a surprising manner if it is reinforced in its freely vibrating marginal area in accordance with the present invention.
  • Sound producers are also already known in which there is provided instead of an even circular vibratory disc, a at vibratory beam which is tapered in cross section on both sides of a central attachment point in order to give greater elasticity to both its arms.
  • These vibratory beams have comparatively accurately defined vibration and depend substantially only on the diaphragm for the formation of the sound waves.
  • the vibratory disc constructed in accordance with the invention on the other hand also acts directly as a radiating surface which transmits energy in vibrations particularly in the high frequencies.
  • Fig. 1 is a diagrammatic sectional view through an electromagnetically actuated horn
  • Fig. 2 is a front view of the vibratory disc
  • Fig. 3 is a cross section on line III--III of Fig. 2, and
  • Fig. 4 is a view similar to Fig. l and showing the armature impinging on the core.
  • An electro-magnet 2 is mounted in a casing 1 and is excited periodically in a manner not shown in greater detail. Opposite the poles of the electro-magnet 2 is disposed an armature 3 which is firmly connected thereto with a bolt 4. On the bolt are also secured a diaphragm 5 and a vibratory disc 6.
  • the diaphragm 5 which is illustrated in the drawing as an even at diaphragm, but could equally well be a diaphragm provided with annular corrugations, is firmly gripped on its outer periphery between a marginal section of the casing 1 and a closing ring 7, the inner edge of which extends into the vicinity of the outer edge of the vibratory disc 6.
  • the vibratory disc 6 On its outer edge, the vibratory disc 6 has a rim-like reinforcement 8 which projects out of the plane of the disc on one side.
  • the disc 6 is so mounted that the rim 8 is disposed on the side of the disc 6 turned away from the diaphragm 5 so that the disc may be disposed as near as possible to the diaphragm.
  • the inner edge 9 of the n'm of the disc 2,787,786 Patented Apr. 2, 1957 is inclined in a direction towards the middle of the disc whereby the mechanical durability of the disc, as also the formation of the vibration, is improved.
  • the diameter of the vibratory disc 6 is also an advantage for the diameter of the vibratory disc 6 to be greater than half of the diameter of the vibratory part of the diaphragm 5.
  • a diaphragm means for im parting periodic vibration exciting power impulses to the diaphragm, a vibratory disc disposed in confronting spaced relation to the diaphragm, means for connecting the center of said disc to the center of the diaphragm, said disc having a central portion of substantially uniform thickness and being reinforced in thickness in its marginal region.
  • a diaphragm means for imparting periodic vibration exciting power impulses to the diaphragm, a vibratory disc disposed in confronting relation to the diaphragm, means for connecting the center of said disc to the center of the diaphragm, said disc having an inner portion of substantially uniform thickness and a rim portion of increased thickness projecting from the disc in a direction away from the diaphragm, said rim portion having an inner surface inclined in a direction towards the center of the disc.
  • a diaphragm means for clamping the diaphragm at its marginal edge, means for imparting periodic vibration exciting power impulses to the central portion of the diaphragm, a vibratory disc disposed in face to face confronting relation with the diaphragm, means for connecting the center of said disc to the -central portion of the diaphragm, 'said disc having a center portion of substantially uniform thickness and a rim portion of increased thickness projecting from the disc in a direction away from the diaphragm, the disc yhaving a diameter greater than half the diameter of the vibrating center portion of the diaphragm.
  • a diaphragm means for imparting periodic vibration exciting power impulses to theydi-aphragm, a vibratory disc disposed in face to face confronting relation with the diaphragm, means for connecting the center of said disc lto the diaphragm, said disc having an inner portion of substantially uniform thickness and a rim portion of increased thickness projecting from the -disc ⁇ on only one side of the disc, the thickness ⁇ of the rim of the disc being approximately twice the thickness of the inner portion of the disc.
  • a vibratory disc disposed in confronting face to face spaced relation with the diaphragm, means for connecting the center of the disc to the center ⁇ of the vibrating diaphragm with ⁇ outer parts of the disc free to vibrate, said disc having ⁇ an inner portion of substantially uniform thickness and a rim portion of increased thickness projecting from the disc on only one side ⁇ of the disc, the radial width of the rim of the disc being less th-an one eighth of the diameter of the disc.
  • a disc shaped diaphragm means for imparting periodic vibration exciting power impulses to the diaphragm, a vibratory disc, means for clamping the marginal edge of the diaphragm so that only the center portion of the diaphragm can vibrate, means connecting the center of the disc to the center of the diaphragm and disposing the dise in spaced face to face relation with the diaphragm, said disc having -a diameter greater than half the diameter of the vibrating center portion of the diaphragm, said disc having a center portion of substantially uniform thickness and a rim portion having a thickness approximately twice the thickness of the inner portion, said rim portion having a radial width less than one eighth of the diameter of the disc, projecting from the disc in a direction away from the diaphragm, and having lan inner surface inclined in a direction towards the center of the disc.

Description

Filed June 29, 1955 fsiii'mf.
,Mrt a i II .9
United States Patent O SOUND PRODUCERS Gustav Zeininger, Oberesslingen, and Jrg Issler, Stuttgart, Germany, assignors to Robert Bosch G. m. b. H., Stuttgart, Germany Application June 29, 1953, Serial No. 364,734
Claims priority, application Germany July 5, 1952 6 Claims. (Cl. 340-388) The invention relates to a sound producer having a diaphragm which is set vibrating by periodic power impulses and which is connected centrally with a substantially even circular vibratory disc, more particularly to a signal horn for mechanically propelled vehicles.
With the previously known sound producers of the type set forth the vibratory disc is either equally thick throughout or is tapered towards its edge.
The effect of a vibratory disc on the strength and audibility of the sound waves emitted may be improved in a surprising manner if it is reinforced in its freely vibrating marginal area in accordance with the present invention.
By this means it is rendered possible for as large a portion as possible of the energy imparted to the vibratory disc by the power impulses to be radiated in the high frequencies whereby sound waves of a tone particularly suitable for penetrating areas of noise are produced.
Sound producers are also already known in which there is provided instead of an even circular vibratory disc, a at vibratory beam which is tapered in cross section on both sides of a central attachment point in order to give greater elasticity to both its arms. These vibratory beams have comparatively accurately defined vibration and depend substantially only on the diaphragm for the formation of the sound waves. The vibratory disc constructed in accordance with the invention on the other hand also acts directly as a radiating surface which transmits energy in vibrations particularly in the high frequencies.
The invention will be further described by way of example in greater detail with reference to the accompanying drawings which show by way of example one construction embodying the present invention and in which:
Fig. 1 is a diagrammatic sectional view through an electromagnetically actuated horn,
Fig. 2 is a front view of the vibratory disc,
Fig. 3 is a cross section on line III--III of Fig. 2, and
Fig. 4 is a view similar to Fig. l and showing the armature impinging on the core.
An electro-magnet 2 is mounted in a casing 1 and is excited periodically in a manner not shown in greater detail. Opposite the poles of the electro-magnet 2 is disposed an armature 3 which is firmly connected thereto with a bolt 4. On the bolt are also secured a diaphragm 5 and a vibratory disc 6. The diaphragm 5 which is illustrated in the drawing as an even at diaphragm, but could equally well be a diaphragm provided with annular corrugations, is firmly gripped on its outer periphery between a marginal section of the casing 1 and a closing ring 7, the inner edge of which extends into the vicinity of the outer edge of the vibratory disc 6.
On its outer edge, the vibratory disc 6 has a rim-like reinforcement 8 which projects out of the plane of the disc on one side. In the example of construction illustrated the disc 6 is so mounted that the rim 8 is disposed on the side of the disc 6 turned away from the diaphragm 5 so that the disc may be disposed as near as possible to the diaphragm. The inner edge 9 of the n'm of the disc 2,787,786 Patented Apr. 2, 1957 is inclined in a direction towards the middle of the disc whereby the mechanical durability of the disc, as also the formation of the vibration, is improved.
It has proved to be an advantage if the rim 8 `is so proportioned that its radial width is smaller than one eighth ofthe diameter of the disc 6, whilst the axial thickness of the reinforcement 8 is about twice the thickness of the centre part of the disc.
For the desired production of a sound-penetrating tone it is also an advantage for the diameter of the vibratory disc 6 to be greater than half of the diameter of the vibratory part of the diaphragm 5.
For the vibratory disc 6 special materials with low internal damping effect are suitable such as for example aluminium, artificial material, ceramic substances, glass or the like.
The air gap d between the core of the electromagnet 2 and the armature 3 connected with the diaphragm when in resting position is so small, that the armature impinges on the core on every pull exerted by the electromagnet as shown in Fig. 4.
We claim:
1. In a sound producer, a diaphragm, means for im parting periodic vibration exciting power impulses to the diaphragm, a vibratory disc disposed in confronting spaced relation to the diaphragm, means for connecting the center of said disc to the center of the diaphragm, said disc having a central portion of substantially uniform thickness and being reinforced in thickness in its marginal region.
2. In a sound producer, a diaphragm, means for imparting periodic vibration exciting power impulses to the diaphragm, a vibratory disc disposed in confronting relation to the diaphragm, means for connecting the center of said disc to the center of the diaphragm, said disc having an inner portion of substantially uniform thickness and a rim portion of increased thickness projecting from the disc in a direction away from the diaphragm, said rim portion having an inner surface inclined in a direction towards the center of the disc.
3. In a sound producer, a diaphragm, means for clamping the diaphragm at its marginal edge, means for imparting periodic vibration exciting power impulses to the central portion of the diaphragm, a vibratory disc disposed in face to face confronting relation with the diaphragm, means for connecting the center of said disc to the -central portion of the diaphragm, 'said disc having a center portion of substantially uniform thickness and a rim portion of increased thickness projecting from the disc in a direction away from the diaphragm, the disc yhaving a diameter greater than half the diameter of the vibrating center portion of the diaphragm.
4. In a sound producer, a diaphragm, means for imparting periodic vibration exciting power impulses to theydi-aphragm, a vibratory disc disposed in face to face confronting relation with the diaphragm, means for connecting the center of said disc lto the diaphragm, said disc having an inner portion of substantially uniform thickness and a rim portion of increased thickness projecting from the -disc `on only one side of the disc, the thickness `of the rim of the disc being approximately twice the thickness of the inner portion of the disc.
5. In a sound producer having a vibrating diaphragm, a vibratory disc disposed in confronting face to face spaced relation with the diaphragm, means for connecting the center of the disc to the center `of the vibrating diaphragm with `outer parts of the disc free to vibrate, said disc having `an inner portion of substantially uniform thickness and a rim portion of increased thickness projecting from the disc on only one side `of the disc, the radial width of the rim of the disc being less th-an one eighth of the diameter of the disc. V
6. In a sound producer, a disc shaped diaphragm, means for imparting periodic vibration exciting power impulses to the diaphragm, a vibratory disc, means for clamping the marginal edge of the diaphragm so that only the center portion of the diaphragm can vibrate, means connecting the center of the disc to the center of the diaphragm and disposing the dise in spaced face to face relation with the diaphragm, said disc having -a diameter greater than half the diameter of the vibrating center portion of the diaphragm, said disc having a center portion of substantially uniform thickness and a rim portion having a thickness approximately twice the thickness of the inner portion, said rim portion having a radial width less than one eighth of the diameter of the disc, projecting from the disc in a direction away from the diaphragm, and having lan inner surface inclined in a direction towards the center of the disc.
References Cited in the le of this patent UNITED STATES PATENTS 1,523,964 Horig Ian. 20, 1925 1,737,883 Hecht a Dec. 3, 1929 1,940,150 Sei'ss Dec. 19, 1933 2,046,772 Critchfield July 7, 1936 2,228,677 Scofield Jan. 14, -1941 FOREIGN PATENTS 346,355 Germany Dec, 29, 1952
US364734A 1952-07-05 1953-06-29 Sound producers Expired - Lifetime US2787786A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB21070A DE969187C (en) 1952-07-05 1952-07-05 Sound generator for signaling purposes

Publications (1)

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US2787786A true US2787786A (en) 1957-04-02

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US (1) US2787786A (en)
AT (1) AT184490B (en)
BE (1) BE521219A (en)
CH (1) CH313481A (en)
DE (1) DE969187C (en)
DK (1) DK84709C (en)
ES (1) ES209690A1 (en)
FR (1) FR1083686A (en)
GB (1) GB731642A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3358084A (en) * 1964-02-17 1967-12-12 William J Ashworth Electromagnetic sound reproducer
EP0052975A1 (en) * 1980-11-22 1982-06-02 LUCAS INDUSTRIES public limited company Horn body and horn having such a horn body
FR2977062A1 (en) * 2011-06-23 2012-12-28 Renault Sa Diffuser for disk-type sound-signaling hooter in siren alarm of car, has coupling region, where resonant frequency of diffuser is equal to harmonic of nth order of fundamental frequency of excitation in which number n is integer

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1226231A (en) * 1958-07-16 1960-07-08 Magneti Marelli Spa Electro-acoustic warning device, in particular for motor vehicles
US3157151A (en) * 1962-04-25 1964-11-17 Westinghouse Electric Corp Ultrasonic generator
DE2261868C2 (en) * 1972-12-18 1982-03-04 Westfälische Metall Industrie KG Hueck & Co, 4780 Lippstadt Acoustic signal generator, in particular an impact horn

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE346355C (en) *
US1523964A (en) * 1922-12-26 1925-01-20 Bosch Robert Signaling instrument
US1737883A (en) * 1924-02-20 1929-12-03 Signal Ges Mit Beschankter Haf Diaphragm especially for sound receiving and radiating apparatus
US1940150A (en) * 1930-01-02 1933-12-19 George J Seiss Automobile horn
US2046772A (en) * 1929-06-29 1936-07-07 Gen Motors Corp Sound signal
US2228677A (en) * 1938-06-11 1941-01-14 Sparks Withington Co Warning signal

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE381250C (en) * 1923-09-18 Robert Bosch Akt Ges Acoustic signal instrument
US1750348A (en) * 1925-07-10 1930-03-11 North East Appliance Corp Electric horn
US1759443A (en) * 1925-07-10 1930-05-20 North East Appliance Corp Electromagnetic horn
DE441898C (en) * 1926-03-04 1927-03-19 Sparks Withington Company Electromagnetic horn, in which, in addition to the record, a vibrating disc firmly connected to it is set in vibration by an electromagnet
AT124847B (en) * 1929-08-31 1931-10-10 Bosch Robert Electromagnetic horn, in particular for vehicles.
DE578551C (en) * 1931-10-20 1933-06-15 Herm Riemann Fa Magnetic horn

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE346355C (en) *
US1523964A (en) * 1922-12-26 1925-01-20 Bosch Robert Signaling instrument
US1737883A (en) * 1924-02-20 1929-12-03 Signal Ges Mit Beschankter Haf Diaphragm especially for sound receiving and radiating apparatus
US2046772A (en) * 1929-06-29 1936-07-07 Gen Motors Corp Sound signal
US1940150A (en) * 1930-01-02 1933-12-19 George J Seiss Automobile horn
US2228677A (en) * 1938-06-11 1941-01-14 Sparks Withington Co Warning signal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3358084A (en) * 1964-02-17 1967-12-12 William J Ashworth Electromagnetic sound reproducer
EP0052975A1 (en) * 1980-11-22 1982-06-02 LUCAS INDUSTRIES public limited company Horn body and horn having such a horn body
FR2977062A1 (en) * 2011-06-23 2012-12-28 Renault Sa Diffuser for disk-type sound-signaling hooter in siren alarm of car, has coupling region, where resonant frequency of diffuser is equal to harmonic of nth order of fundamental frequency of excitation in which number n is integer

Also Published As

Publication number Publication date
DE969187C (en) 1958-05-08
GB731642A (en) 1955-06-08
BE521219A (en) 1953-07-31
DK84709C (en) 1958-04-08
AT184490B (en) 1956-01-25
CH313481A (en) 1956-05-31
ES209690A1 (en) 1954-08-01
FR1083686A (en) 1955-01-11

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