US3429294A - Sound transmitter for gaseous operating fluid - Google Patents

Sound transmitter for gaseous operating fluid Download PDF

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Publication number
US3429294A
US3429294A US573422A US3429294DA US3429294A US 3429294 A US3429294 A US 3429294A US 573422 A US573422 A US 573422A US 3429294D A US3429294D A US 3429294DA US 3429294 A US3429294 A US 3429294A
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US
United States
Prior art keywords
diaphragm
pressure
housing
operating fluid
ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US573422A
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English (en)
Inventor
Bengt Lennart Holm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kockums Mekaniska Verkstads AB
Original Assignee
Kockums Mekaniska Verkstads AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kockums Mekaniska Verkstads AB filed Critical Kockums Mekaniska Verkstads AB
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Publication of US3429294A publication Critical patent/US3429294A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • G10K7/00—Sirens
    • G10K7/06—Sirens in which the sound-producing member is driven by a fluid, e.g. by a compressed gas
    • 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
    • G10K5/00—Whistles
    • 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

Definitions

  • This invention relates to sound transmitters for gaseous operating fluid, the movable part of which is a circular diaphragm provided in a housing and held by its inherent elasticity in engagement with an annular, preferably circular seat concentric with the periphery of the diaphragm to form a valve member controlling the communication between an inlet passage outside the seat and a resonator passage within said seat.
  • operating fluid usually air or steam
  • the diaphragm is raised from the seat as soon as said pressure has attained a value enabling it to overcome the force by which the diaphragm is held in engagement with the seat.
  • a pressure shock will arise in the resonator passage, and according to generally known principles this pressure shock in turn results in several successive pressure shocks of a frequency substantially determined by the acoustic conditions in a horn connected to the resonator passage.
  • the diaphragm may be secured at its periphery in many diflerent ways in the housing. Frequently, the diaphragm is fixedly clamped at its periphery by means of a cover provided on said housing and arching over the diaphragm on that side thereof which is opposite the inlet and resonator passages, a planar edge of said cover engaging the edge portion of the diaphragm and urging said edge portion against a shoulder or packing in the housing.
  • a disadvantage of this arrangement is that during the sound production the peripheral parts of the diaphragm cannot move radially during the bulging movements of the diaphragm.
  • a fixed clamping of the diaphragm in this manner may result in an undesirable blocking of the diaphragm in bulging position due to radial thermal stresses, unless the diaphragm and the housing always have the same temperature.
  • a diaphragm which is radially movable at its periphery can be obtained by not clamping the cover against the housing and instead holding the diaphragm in correct position with a certain clearance. However, in most cases this does not bring the desired seal and also results in a not unimportant wear at the periphery of the diaphragm due to the diaphragm movements, for which reason frequent adjustments of the clearance have been necessary.
  • the diaphragm can also be secured resiliently, for instance by means of a rubber packing between the diaphragm and the housing or between the diaphragm and the cover, or both.
  • a rubber packing between the diaphragm and the housing or between the diaphragm and the cover, or both.
  • the present invention relates to a sound transmitter of the type described above, in which the diaphragm is clamped at its periphery against a resilient abutment by means of a cover, but where the drawbacks of present attachment methods are eliminated.
  • such a sound transmitter is characterized in that the cover abuts one side of the diaphragm along a line located radially inwardly of the general line, located on the other side of said diaphragm, of maximum pressure exerted by the resilient abutment on the diaphragm.
  • FIG. 1 is a partial axial section of a sound transmitter according to the invention, where the resilient abutment is an O-ring;
  • FIG. 2 is a corresponding section of a sound transmitter where the resilient abutment is a metallic annular member.
  • the sound transmitter shown in FIG. 1 comprises a housing 10 with a cover 11 and a circular seat 12 fixedly connected with the housing. Between the cover 11 and a packing ring 13 which is of resilient material and rests on a shoulder 14 in the housing 10, there is resiliently clamped a circular diaphragm 15 which is concentric with the seat 12 and by its inherent elasticity is held in engagement therewith so as to form, in known manner, a valve member controlling the communication between an inlet passage or chamber 16 outside the seat in the housing and a resonator passage or chamber 17 within the seat in the housing, the inlet passage communicating with a conduit for the supply of gaseous operating fluid and the resonator passage being connected to a horn.
  • the function of such sound transmitters is well known so that no detailed description would here seem necessary.
  • the diaphragm 15 is secured in the housing 10 in a manner specific to the invention.
  • the cover 11 is formed on its inner side with a relatively sharp-edged ridge 18 by which the cover engages the diaphragm along the periphery thereof at a radial distance from the centre of the diaphragm which is smaller than the radial dis tance of that general line along the periphery of the diaphragm along which the packing ring 1'3 in the form of an O-ring exerts its maximum pressure on the diaphragm on that side of the diaphragm which is opposite the cover, the radial position of said line being indicated in FIG. 1 by a dash-and-dot line 19.
  • the attachment of the diaphragm 15 causes adjacent the periphery of the diaphragm a bending moment tending to increase the pressure force of the diaphragm against the seat 12 and having a value which is determined inter alia by the mutual radial distance between the line along which the diaphragm bears against the ridge 18 of the cover and the general line along which the O-ring exerts its maximum pressure on the diaphragm.
  • the bending moment is highly important to the function of the diaphragm and above all to its strength. It is well known that the highest stress of a bulging diaphragm of uniform thickness occurs in the vicinity of the diaphragm centre if the diaphragm is loosely placed along its periphery, i.e.
  • the peripheral bending moment acting on the diaphragm can be mastered in a manner which has hitherto not been possible with resiliently clamped diaphragms, viz. by a suitable choice of the radial distance between the pressure line 19 of the packing ring 13 on one side of the diaphragm and the pressure line of the ridge 18 on the opposite side of said diaphragm. Because the bending moment on the diaphragm is produced according to the invention by means of a force couple adjacent the periphery of the diaphragm, the compression of the packing ring may be relatively insignificant, while still providing an adequate bending moment suitable for the function.
  • this moment is only slightly dependent on the hardness of the packing so that a change in the hardness due to a possible aging of the material in the packing ring will not deteriorate the function of the sound transmitter.
  • the bending moment can be favourably influenced by the pressure of the operating fluid in the inlet passage 16. If the resilient abutment is a massive O-ring, as in FIG.
  • the sound transmitter can be supplied under a pressure which may vary within relatively wide limits without considerable variations in the intensity of the sound and thus in the consumption of gaseous operating fluid. This is especially important in steam-operated sound transmitters where water of condensation in the steam supply pipe to the inlet passage 16 may often result in an irregular temporary throttling of the supply of dry steam to the sound transmitter; in steamoperated sound transmitters it is ditficult completely to avoid the formation of water of condensation.
  • the abutment may be in the form of a metal ring 13' of S or C profile, as is shown in FIG. 2, the said ring being supported in the housing 10 against the shoulder 14 with its one edge and engaging the diaphragm 14 with its other edge.
  • a pressure fluid operated sound generator comprising in combination:
  • a a generally cylindrical, horn-like composite housing
  • said housing (10) including annular wall means defining a central resonator passage (17) and terminating at an inner end in unitarily formed annular seat means (12) spaced radially inwardly of said housing wall (10) which latter space constitutes part of a fluid inlet chamber (16);
  • said diaphragm disk (15) defining together with said housing and said annular seat means (12) an annular inlet chamber (16) for receiving gaseous operating pressure fluid around said annular seat means (12) and said disk further serving as a vibratory valve therewith for periodically admitting pressure fluid from the inlet chamber (16) into the resonator passage (17);
  • said resilient ring (13) having a cross sectional shape capable of resilient deformation responsive to the application of pressure fluid in the inlet chamber (16) acting on one side only of said ring (13);
  • said ring (13) assumes a greater cross-sectional dimension between said shoulder (14) and said diaphragm disk (15) at increasing fluid pressure in the inlet chamber ('16), whereby said ring (13) aids said abutment means (18) in biasing said diaphragm disk (15) against said annular seat means (12) with an increasing force at increasing fluid pressure in the inlet chamber.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Diaphragms And Bellows (AREA)
  • Measuring Fluid Pressure (AREA)
US573422A 1965-08-24 1966-08-18 Sound transmitter for gaseous operating fluid Expired - Lifetime US3429294A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE11025/65A SE307757B (da) 1965-08-24 1965-08-24

Publications (1)

Publication Number Publication Date
US3429294A true US3429294A (en) 1969-02-25

Family

ID=20293219

Family Applications (1)

Application Number Title Priority Date Filing Date
US573422A Expired - Lifetime US3429294A (en) 1965-08-24 1966-08-18 Sound transmitter for gaseous operating fluid

Country Status (4)

Country Link
US (1) US3429294A (da)
DE (1) DE1949611U (da)
GB (1) GB1115857A (da)
SE (1) SE307757B (da)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3714193A (en) * 1970-09-23 1973-01-30 Colgate Palmolive Co Derivatives of 1,2,3,4-tetrahydro-5h-benzothieno[2,3-c]azepines
US3757731A (en) * 1972-07-05 1973-09-11 Falcon Safety Prod Gas power operated hand held acoustic devices
US4171678A (en) * 1977-07-22 1979-10-23 Midland-Ross Corporation Air horn
US5662064A (en) * 1991-10-30 1997-09-02 Gyoergy; Laszlo High acoustic output horn
US20060150890A1 (en) * 2005-01-13 2006-07-13 Wayne Cohen Horn assembly
US20060201330A1 (en) * 2005-03-11 2006-09-14 Wayne Cohen Combined beverage container and horn assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2222297A (en) * 1988-05-28 1990-02-28 John Alfred Worthington Improvements to gas powered alarm device

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1029521A (en) * 1911-03-16 1912-06-11 Theodore Weiss Electrical signaling device.
US1085354A (en) * 1913-01-25 1914-01-27 Peter J Mukautz Sound-box.
US2273968A (en) * 1940-10-22 1942-02-24 Westinghouse Air Brake Co Pneumatic horn
US2352467A (en) * 1939-03-18 1944-06-27 Broden John Gustaf Mauritz Alarm apparatus
US2579784A (en) * 1945-04-28 1951-12-25 Kockums Mekaniska Verkstads Ab Vibrator
US2658470A (en) * 1950-02-02 1953-11-10 Nathan Mfg Corp Sound producing device
US2884892A (en) * 1954-12-01 1959-05-05 Nathan Mfg Corp Pneumatic sound producing device
US3117552A (en) * 1961-10-05 1964-01-14 Railway Appliance Res Ltd Pneumatic sound producing devices

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1029521A (en) * 1911-03-16 1912-06-11 Theodore Weiss Electrical signaling device.
US1085354A (en) * 1913-01-25 1914-01-27 Peter J Mukautz Sound-box.
US2352467A (en) * 1939-03-18 1944-06-27 Broden John Gustaf Mauritz Alarm apparatus
US2273968A (en) * 1940-10-22 1942-02-24 Westinghouse Air Brake Co Pneumatic horn
US2579784A (en) * 1945-04-28 1951-12-25 Kockums Mekaniska Verkstads Ab Vibrator
US2658470A (en) * 1950-02-02 1953-11-10 Nathan Mfg Corp Sound producing device
US2884892A (en) * 1954-12-01 1959-05-05 Nathan Mfg Corp Pneumatic sound producing device
US3117552A (en) * 1961-10-05 1964-01-14 Railway Appliance Res Ltd Pneumatic sound producing devices

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3714193A (en) * 1970-09-23 1973-01-30 Colgate Palmolive Co Derivatives of 1,2,3,4-tetrahydro-5h-benzothieno[2,3-c]azepines
US3757731A (en) * 1972-07-05 1973-09-11 Falcon Safety Prod Gas power operated hand held acoustic devices
US4171678A (en) * 1977-07-22 1979-10-23 Midland-Ross Corporation Air horn
US5662064A (en) * 1991-10-30 1997-09-02 Gyoergy; Laszlo High acoustic output horn
US20060150890A1 (en) * 2005-01-13 2006-07-13 Wayne Cohen Horn assembly
US20060201330A1 (en) * 2005-03-11 2006-09-14 Wayne Cohen Combined beverage container and horn assembly

Also Published As

Publication number Publication date
DE1949611U (de) 1966-11-10
SE307757B (da) 1969-01-13
GB1115857A (en) 1968-05-29

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