US3631480A - Electrically operated sound generators - Google Patents

Electrically operated sound generators Download PDF

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Publication number
US3631480A
US3631480A US7799A US3631480DA US3631480A US 3631480 A US3631480 A US 3631480A US 7799 A US7799 A US 7799A US 3631480D A US3631480D A US 3631480DA US 3631480 A US3631480 A US 3631480A
Authority
US
United States
Prior art keywords
casing
solenoid
strip
armature
fixed
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
US7799A
Other languages
English (en)
Inventor
Alec John Heap
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.)
ZF International UK Ltd
Original Assignee
Lucas Industries Ltd
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 Lucas Industries Ltd filed Critical Lucas Industries Ltd
Application granted granted Critical
Publication of US3631480A publication Critical patent/US3631480A/en
Anticipated expiration legal-status Critical
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
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
    • G10K9/13—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using electromagnetic driving means
    • G10K9/15—Self-interrupting arrangements

Definitions

  • An electrically operated sound generator includes a casing housing a solenoid.
  • a fixed contact is positioned within the casing and is engageable by a movable contact carried by the armature of the solenoid.
  • the fixed and movable contacts are in the energizing circuit of the solenoid, so that when a current is supplied to the sound generator the armature of the solenoid is caused to vibrate, as the energizing circuit of the solenoid is made and broken through the fixed and movable contacts, thereby generating sound.
  • the fixed contact is carried by a deformable metal strip one end of which projects from the casing of the sound generator. In order to effect tuning of the sound generator the projecting end of the strip is moved to deform the strip to alter the position of the fixed contacts relative to the solenoid.
  • This invention relates to electrically operated sound generators of the kind including a casing, a solenoid housed within a casing, a fixed contact within the casing, and a movable contact engageable with the fixed contact, and wherein the movable contact is moved with the armature of the solenoid and the fixed and movable contacts are in the energizing circuit of the solenoid so that when current is supplied to the generator the armature is caused to vibrate, as the energizing circuit of the solenoid is made and broken, thereby generating sound.
  • the fixed contact is carried by metal strip which is capable of being deformed to alter the position of the fixed contact relative to the solenoid to effect tuning of the sound generator, one end of said strip projecting from the casing to facilitate tuning of the generator.
  • FIG. 1 is a plan view of a sound generator with part of the casing omitted
  • FIG. 2 is a sectional view on the line A-A in FIG. 1.
  • the sound generator includes a moulded synthetic resin casing 11 of open boxlike construction, the open side of which is closed in use by a molded cover plate 12 engaged as a snap fit with the casing 11.
  • the winding 13 of a solenoid Housed within the casing 11 is the winding 13 of a solenoid, the winding 13 being wound on a cylindrical synthetic resin spool 14 having integral outwardly extending flanges 15 at opposite axial ends thereof respectively.
  • the spool 14 is held in the casing by engagement of the flanges 15 with one wall of the casing, and with a log 16 integral with the casing, the spool 14 being an interference fit between the lug 16 and the wall of the casing 11.
  • the flanges 15 of the spool 14 include respective projections 15a around which the end portions of the winding 13 are looped to secure the winding on the spool.
  • the metal pole 17 of the solenoid extends through the center of the spool 14, and the armature 18 of the solenoid is rivette'd to a phosphor bronze spring strip 19 and is spaced from the pole 17, in the rest condition of the strip 19, by a predetermined air gap.
  • the end of the strip 19 remote from the armature 18 is received as an interference fit between a pair of pegs 21 and a further peg 22, the pegs 21, 22, being integral with the casing 11, and serving to retain the strip 19 in position.
  • the strip 19 Adjacent the armature 18 the strip 19 carries a contact 23 which is engageable with a fixed contact 24, the contact 23 and the armature 18 being movable relative to the casing by flexure of the strip 19.
  • the fixed contact 24 is electrically and physically connected to one limb 25a of an L-shaped copper strip 25, the other limb 25b of which is secured to the casing 11.
  • the limb 25b of the strip 25, which is secured to the casing projects from the casing and is shaped to define a blade terminal, while the limb 25a of the strip 25, which carries the contact 24, projects through a slot 26 in the wall of the casing 11 remote from the cover plate l2.
  • winding 13 is electrically connected to the phosphor bronze strip 19, and other end of the winding 13 is electrically connected to a copper strip 27 which is secured to the casing 11, and which extends therefrom in the form of a blade terminal. 1n the unstressed condition of the strip 19, the armature 18 is spaced from the pole 17 of the solenoid by a predetermined airgap, and the contact 23 is engaged with the fixed contacts 24. Thus, the winding 13 is electrically connected between the blade terminals constituted by the strip 25 and the strip 27, through the intermediary of the contacts 24 the contacts 23 and the strip 19.
  • the blade connector defined by the strip 25 is electrically connected to one pole of ADC source through a control switch, and the blade terminal defined by the strip 27 is electrically connected to the other pole of the DC source.
  • the control switch is closed, current flows in the winding 13, and the armature 18 is drawn towards the pole 17 thereby flexing the strip 19 and moving the contact 23 out of engagement with the contacts 24.
  • Disengagement of the contact 23 from the contacts 24 breaks the circuit to the winding 13 thereby deenergrzmg the solenoid
  • the generator is tuned by engaging a tool with the portion of the limb 25a of the strip 25 which projects through the slot 26, and then bending the limb 25a to alter the distance by which the contact 24 is spaced from the pole 17.
  • An electrically operated sound generator including a casing, a solenoid housed within the casing and including an armature, a deformable metal strip extending within the casing, a fixed electrical contact carried by said deformable metal strip, a movable electrical contact movable with said armature, means connecting the fixed and movable contacts in circuit with the solenoid, so that when electrical current is supplied to the generator the armature is caused to vibrate as the circuit of the solenoid is made and broken, thereby generating sound, and, said deformable metal strip including a portion which projects from the casing so as to facilitate deformation of said metal strip to alter the position of said fixed contacts, and thereby effect tuning of the sound generator.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Basic Packing Technique (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Electromagnets (AREA)
  • Electromechanical Clocks (AREA)
US7799A 1969-02-11 1970-02-02 Electrically operated sound generators Expired - Lifetime US3631480A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB727069 1969-02-11

Publications (1)

Publication Number Publication Date
US3631480A true US3631480A (en) 1971-12-28

Family

ID=9829893

Family Applications (1)

Application Number Title Priority Date Filing Date
US7799A Expired - Lifetime US3631480A (en) 1969-02-11 1970-02-02 Electrically operated sound generators

Country Status (6)

Country Link
US (1) US3631480A (fr)
AU (1) AU1108470A (fr)
DE (1) DE2005599A1 (fr)
ES (1) ES156006Y (fr)
FR (1) FR2032716A5 (fr)
GB (1) GB1295052A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3774200A (en) * 1972-11-10 1973-11-20 Gen Motors Corp Buzzer including coil with wound connections
US3864823A (en) * 1974-01-08 1975-02-11 Gen Signal Corp Method of making a buzzer structure
US3938143A (en) * 1971-10-22 1976-02-10 Stewart-Warner Corporation Buzzer
US4005413A (en) * 1974-01-08 1977-01-25 General Signal Corporation Buzzer construction and method of adjusting the same
US4075627A (en) * 1977-02-02 1978-02-21 Pittway Corporation Electric horn

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1298675A (en) * 1969-06-11 1972-12-06 Lucas Industries Ltd Electromagnetic horns

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2791765A (en) * 1954-11-18 1957-05-07 Trix Ltd Magnetic sound generators

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2791765A (en) * 1954-11-18 1957-05-07 Trix Ltd Magnetic sound generators

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938143A (en) * 1971-10-22 1976-02-10 Stewart-Warner Corporation Buzzer
US3774200A (en) * 1972-11-10 1973-11-20 Gen Motors Corp Buzzer including coil with wound connections
US3864823A (en) * 1974-01-08 1975-02-11 Gen Signal Corp Method of making a buzzer structure
US4005413A (en) * 1974-01-08 1977-01-25 General Signal Corporation Buzzer construction and method of adjusting the same
US4075627A (en) * 1977-02-02 1978-02-21 Pittway Corporation Electric horn

Also Published As

Publication number Publication date
ES156006Y (es) 1971-01-01
DE2005599A1 (de) 1970-09-03
GB1295052A (fr) 1972-11-01
ES156006U (es) 1970-04-16
AU1108470A (en) 1971-08-12
FR2032716A5 (fr) 1970-11-27

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