US3673441A - Control apparatus - Google Patents

Control apparatus Download PDF

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Publication number
US3673441A
US3673441A US820927A US3673441DA US3673441A US 3673441 A US3673441 A US 3673441A US 820927 A US820927 A US 820927A US 3673441D A US3673441D A US 3673441DA US 3673441 A US3673441 A US 3673441A
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US
United States
Prior art keywords
spring
plane
transducer
clamping
springs
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
US820927A
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English (en)
Inventor
Larry H Royster
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.)
Honeywell Inc
Original Assignee
Honeywell Inc
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Filing date
Publication date
Application filed by Honeywell Inc filed Critical Honeywell Inc
Application granted granted Critical
Publication of US3673441A publication Critical patent/US3673441A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/08—Mouthpieces; Microphones; Attachments therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers

Definitions

  • the present invention relates generally to transducers and more specifically to bender bar transducers.
  • the method of mounting transducers has varied over a wide range.
  • the springs were mounted in parallel with the longitudinal axis of the bender bar transducer, and then as shown in a Gordon Vincent U.S. Pat. No. 3,341,721 issued Sept. 12, 1967 and assigned to the same assignee as the present invention, the spring hinges were mounted at right angles to the longitudinal axis.
  • this method of mounting provided increased efficiency over the prior systems, failure often occurred when using large bender bars. The failure resulted from over stressing the springs.
  • the present invention overcomes the prior art problems in two ways which may be used separately or together.
  • the first I is to clamp the springs so that they can flex from at the longitudinal axis of the transducer rather than only at locations outward from the edge of the transducer as shown in the Vincent patent, and the other is to reduce the thickness of the spring hinges atthe desired flexure point along with providing clamps which extend past the edge of the reduced section so that there are no concentrated stresses on the springs at the edges of the clamps.
  • the concentrated stresses were found to occur even though the clamps were rounded at the comers.
  • the present method of clamping substantially reduces this type of stress.
  • FIG. 1 is a side view of a spring mounted transducer
  • FIG. 2 is a front view perpendicular to the longitudinal plane of the transducer showing its general shape and method of clamping;
  • FIG. 3 is a detail view of the clamping portion along with the reduced section spring
  • FIG. 4 shows the prior art clamp
  • FIG. 5 is a schematic illustration of the bending mode produced in the prior art spring mounts.
  • FIG. 6 is an illustration of the bending mode produced in the spring mount of-the present invention.
  • a bending bar transducer generally indicated as 10 i is shown adjacent a support'l2 and connected thereto by springs 14 and l6.'The springs 14 and Marc clamped against the support 12 by segmented portions 18 and 20 respectively.
  • the support 12 may be part of a housing or any other stationary object with respect to which the transducer 10 is to vibrate.
  • the transducer 10 has bolts 22 extending therethrough and compressing the transducer elements between clamps 32 and 34 in a manner known in the art and described in the abovereferenced Vincent patent. On each end of the transducer 10 are additional bolts 24 and 26 compressing clamps 28 and 30 respectively against mating portions on clamps 32 and 34.
  • Bolts 24 and 26 extend through holes in the clamps 28 and 30 and the springs 14 and ,16 to hold the springs in place. As shown more clearly in FIG. 2 springs 14 and 16 are clamped securely against raised shoulders on clamps 32 and 34 which are used to hold the transducer 10 in a compressed state. The clamping of the springs 14 and 16 at the support end is shown schematically as there are many ways of accomplishing the clamping not pertinent to the invention.
  • FIGLB a bolt 41 is shown with its head against an upper clamp 43 holding one end 45 of a flexible spring generally designated as 47 against a lower portion 49 of the clamping mechanism. Only a section of portion 49 is shown.
  • the spring 47 and the clamps have holes therein through which the bolt 41 passes to produce the clamping or compressing action.
  • spring 47 also has a right hand portion 51 and a reduced thickness section 53.
  • the reduced section 53 extends from a short distance interior of the edge of clamps 43 and 49 to a short outside the edge. Upon flexing of the clamped portion, the primary flexing will occur in the reduced section 53 and somewhere near the middle thereof if the end 51 is kept stationary.
  • FIG. 4 a further clamp is shown comprising a spring hinge or flexure means 56 clamped between clamping portions 58 and 60 by a bolt 62.
  • the right hand side of clamps 58 and 60 are rounded as in the prior'art to reduce stress in the spring 56. While this arrangement is better than square comers for reducing stress in spring 56, there is still a substantial amount of stress at the contacting edges since movement of the clamp relative to a stationary support to which the right hand portion of spring 56 is fixed will create most of the stress at the contact points.
  • FIG. 5 illustrates how the springs are bent when they are clamped as shown in the above-referenced Vincent patent.
  • the dashed lines show a bender bar 65 in a relaxed or nonoperating condition while solid lines show the bender bar, which is numbered 65 under maximum deflection in an operative mode.
  • a spring at one end is designated 67 in the unbent or relaxed condition and 67' in the operative condition of maximum deflection. It will be noted that there is substantial bending of the spring due to the fact that there is a significant distance from the longitudinal axis 69 to the edge of bar 65'.
  • FIG. 6 a portion of the drawing of FIG.. 5 is reproduced using 71 and 71' to identify the bender bar, 73 to identify the spring and 75 to identify the longitudinal axis of the bender bar 71. It will be noted that since the end of transducer 71 moves much less at its center line than at its edge, there will be considerably less bending induced in the spring 73 than occurs in spring 67. Thus, the spring is able to support the bender bar 71, without being over stressed, for considerably greater deflections of the bender bar than in the prior art method of mounting.
  • the present invention pertains both to an improved method of mounting a spring hinge supported transducer so that the springs can flex at the longitudinal axis of the transducer, and to an improved configuration of the flat spring hinge or flexure wherein the clamping stresses are reduced to provide for greater reliability.
  • transducing apparatus of the type I wherein a transducing element deflectable in a direction perpendicular to a central longitudinal axis thereof is supported at opposite ends by flat springs positioned generally perpendicular to the axis, each spring extending to a mount on a housing, the axis lying in a plane perpendicular to the direction of deflection, the improvement which comprises:
  • each spring includes an area of reduced thickness adjacent its intersection with the plane.
  • said clamping means includes: a member interposed between each spring and the transducing element;
  • the spring includes an area of reduced thickness adjacent its said means for affixing the spring to said member comprises intersection with the plane.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Measuring Fluid Pressure (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
US820927A 1969-05-01 1969-05-01 Control apparatus Expired - Lifetime US3673441A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US82092769A 1969-05-01 1969-05-01

Publications (1)

Publication Number Publication Date
US3673441A true US3673441A (en) 1972-06-27

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US820927A Expired - Lifetime US3673441A (en) 1969-05-01 1969-05-01 Control apparatus

Country Status (4)

Country Link
US (1) US3673441A (enrdf_load_stackoverflow)
JP (1) JPS5023794B1 (enrdf_load_stackoverflow)
DE (1) DE2019357A1 (enrdf_load_stackoverflow)
GB (1) GB1259402A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2419114A1 (fr) * 1978-03-08 1979-10-05 Yernaux & Cie Ets Systeme vibrant a deux structures assemblees elastiquement
US5009106A (en) * 1989-07-06 1991-04-23 Kistler Instrumente Ag Accelerometer with improved shock resistance
US20080049545A1 (en) * 2006-08-22 2008-02-28 United Technologies Corporation Acoustic acceleration of fluid mixing in porous materials

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60183151U (ja) * 1984-05-11 1985-12-05 住友金属工業株式会社 研削装置
JPS6139348U (ja) * 1984-08-08 1986-03-12 住友金属工業株式会社 研削装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3093760A (en) * 1960-06-15 1963-06-11 Bosch Arma Corp Composite piezoelectric element
US3202962A (en) * 1959-09-03 1965-08-24 Honeywell Inc Transducer
US3321189A (en) * 1964-09-10 1967-05-23 Edison Instr Inc High-frequency ultrasonic generators
US3328610A (en) * 1964-07-13 1967-06-27 Branson Instr Sonic wave generator
US3341721A (en) * 1964-12-16 1967-09-12 Honeywell Inc Transducer housing with flexible supports
US3360664A (en) * 1964-10-30 1967-12-26 Gen Dynamics Corp Electromechanical apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3202962A (en) * 1959-09-03 1965-08-24 Honeywell Inc Transducer
US3093760A (en) * 1960-06-15 1963-06-11 Bosch Arma Corp Composite piezoelectric element
US3328610A (en) * 1964-07-13 1967-06-27 Branson Instr Sonic wave generator
US3321189A (en) * 1964-09-10 1967-05-23 Edison Instr Inc High-frequency ultrasonic generators
US3360664A (en) * 1964-10-30 1967-12-26 Gen Dynamics Corp Electromechanical apparatus
US3341721A (en) * 1964-12-16 1967-09-12 Honeywell Inc Transducer housing with flexible supports

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2419114A1 (fr) * 1978-03-08 1979-10-05 Yernaux & Cie Ets Systeme vibrant a deux structures assemblees elastiquement
US5009106A (en) * 1989-07-06 1991-04-23 Kistler Instrumente Ag Accelerometer with improved shock resistance
US20080049545A1 (en) * 2006-08-22 2008-02-28 United Technologies Corporation Acoustic acceleration of fluid mixing in porous materials
US20100046319A1 (en) * 2006-08-22 2010-02-25 United Technologies Corporation Acoustic Acceleration of Fluid Mixing in Porous Materials
US8408782B2 (en) 2006-08-22 2013-04-02 United Technologies Corporation Acoustic acceleration of fluid mixing in porous materials
US8789999B2 (en) 2006-08-22 2014-07-29 United Technologies Corporation Acoustic acceleration of fluid mixing in porous materials

Also Published As

Publication number Publication date
GB1259402A (enrdf_load_stackoverflow) 1972-01-05
JPS5023794B1 (enrdf_load_stackoverflow) 1975-08-11
DE2019357A1 (de) 1970-11-12

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