GB2072405A - Sound generating device - Google Patents
Sound generating device Download PDFInfo
- Publication number
- GB2072405A GB2072405A GB8009397A GB8009397A GB2072405A GB 2072405 A GB2072405 A GB 2072405A GB 8009397 A GB8009397 A GB 8009397A GB 8009397 A GB8009397 A GB 8009397A GB 2072405 A GB2072405 A GB 2072405A
- Authority
- GB
- United Kingdom
- Prior art keywords
- reed
- rod
- solenoid
- spindle
- core
- 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.)
- Withdrawn
Links
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
-
- 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
- G10K1/063—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 the sounding member being a bell
- G10K1/064—Operating or striking mechanisms therefor
- G10K1/0645—Operating or striking mechanisms therefor provided with loudness adjustment
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Electromagnetism (AREA)
- Electromagnets (AREA)
Abstract
A reed 1 is arranged to be vibrated by a solenoid 2, supplied with alternating or pulsed direct current, to produce a sound. The core of the solenoid takes the form of a rod 7 which is screw-threaded into a stirrup 4. One end of the rod projects towards the reed and the other end engages a manually rotatable spindle 11 so that the rod 7 can be screwed into or out of the stirrup 4 thus varying the amount by which the rod 7 projects towards the reed 1. This controls the amplitude of vibration of the reed and hence the volume of the sound so produced. The spindle 11 has a lug 5 which co-operates with stops so as to limit rotation of the spindle to the useful range. The spindle 11 is a push-fit on the rod 7 to allow the range of adjustment to be pre-set. <IMAGE>
Description
SPECIFICATION
Sound generating devices
This invention relates to sound generating devices, and particularly to such devices in which a solenoid supplied with alternating current or pulsed direct current is arranged to cause a metal reed to vibrate so as to produce a buzzing or ringing sound.
British Patent Specification No. 1 312 291 discloses a device of this kind. In that device the reed is vibrated by a solenoid supplied with alternating current. In order to control the volume of the sound produced by vibration of the reed, a cam eccentrically mounted on a rotatable spindle is arranged to contact the side of the reed remote from the solenoid, such that rotation of the spindle causes the cam to vary the amplitude of vibration of the reed. Whilst there is no doubt that that arrangement works very well, a simpler arrangement for adjusting the amplitude of vibration of the reed has now been devised.
According to the invention, a sound generating device comprises a solenoid, a reed fixed at one end in a predetermined relationship to the solenoid such that when the solenoid is supplied with alternating current or pulsed direct current the reed is caused to vibrate to produce a sound, and a rod extending through the solenoid with one end of the rod projecting towards the reed and the other end having means of adjusting the amount by which the rod projects towards the reed so as to control the amplitude of vibration of the reed.
The amplitude of vibration of the reed may be controlled by contact of the adjacent end of the rod with the reed, but preferably the rod is formed of a magnetisable material to enable the amplitude of vibration to be controlled by adjustment of the size of the air gap between the end of the rod and the reed, so as to control the force with which the solenoid attracts the reed.
The sound produced by vibration of the reed may be enhanced by vibration of the reed aganst a bell or other resonant member.
Where no such resonant member is used, the volume of the sound may be enhanced by mounting the device on a sounding board.
Where the device is used as an alarm in an automatic tea-making apparatus for example, the case or some other suitable part of the apparatus may be used as a sounding board.
When the solenoid is supplied with direct current, the supply may be pulsed by connecting the solenoid in series with a switch which is associated with the reed such that each time the solenoid attracts the reed the switch breaks the supply to the solenoid.
Preferably the means of adjusting the amount by which the rod towards the reed incorporates a screw thread by which the rod is moved into or out of the solenoid on rotation of a spindle.
In a preferred arrangement, the screw thread is formed on the rod and the rotatable spindle engages the rod such that rotation of the spindle causes the rod to rotate.
Use of the screw thread allows fine control over the amount by which the rod projects towards the reed.
Preferably the spindle has a projection which engages stops which are fixed relative to the solenoid, in order to limit rotation of the spindle to the useful range.
The spindle preferably has a socket at one end to receive an end portion of the rod, this end portion having a plurality of circumferentially spaced ridges which locate in complementary grooves on the inside of the socket whereby the spindle engages the rod. The angular relationship of the spindle to the rod may thus be pre-adjusted to produce the required range of linear movement of the rod on rotation of the spindle between the predetermined limits defined by the stops, to compensate for cumulative manufacturing tolerances.
According to a much preferred embodiment of the invention, a sound generating device comprises a solenoid having a core of magnetisable material, a reed fixed at one end in a predetermined relationship to the solenoid such that when the solenoid is supplied with alternating current the reed is caused to vibrate to produce a sound, the core being screw threaded into the solenoid with one end of the core projecting towards the reed and the other end of the core engaging a manualiy rotatable spindle, the spindle being arranged such that rotation thereof screws the core into or out of the solenoid thus varying the amount by which the core projects towards the reed so as to control the amplitude of vibration of the reed.
The invention will now be described, by way of example only, with reference to the accompanying diagrammatic drawings in which:
Figure 1 shows a longitudinal section through a device according to the invention;
Figure 2 is an elevation of the device in the direction A of Fig. 1; and
Figure 3 shows the opposite end of the spindle of the device from that shown in Fig.
2.
The device comprises a reed 1 of spring steel which is arranged to be vibrated by a solenoid 2 when the solenoid is supplied with alternating current via a pair of leads 3.
The solenoid 2 is held in a metal stirrup 4 by a plastics spacer 5. One end of the reed 1 is secured to an arm 4a of the stirrup such that the reed is held in spaced-apart parallel relation to that arm, and the other end of the reed, the free end, carries a disc 6 of magnetisable material.
A rod 7 of magnetisable material, which constitutes the core of the solenoid, is received within an axial bore 8 in the solenoid and extends through apertures 9a, 9b. in the arms of the stirrup 4 and an aperture 10 in the spacer 5, One end of the rod 7, the left hand end as shown, projects from the aperture 9a towards the disc 6. The other end of the rod 7 projects from the aperture 9b and forms a head portion 7a of hexagonal crosssection. A portion 7b of the rod adjacent to this head portion is screw-threaded and the aperture 9b has a complementary screw thread to engage this threaded portion.
A hollow plastics spindle 11 has at one end a slotted head 1 2 and at the other end a socket 1 3. As shown in Fig. 3, twelve Vshaped longitudinal grooves 14 are formed in the wall of the socket 1 3. The hexagonal head portion 7a of the rod is received in the socket 1 3 such that the corners of the hexagon locate in six of the grooves thereby preventing rotation of the spindle relative to the rod. A lug 1 5 is formed on the outside of the spindle adjacent to the stirrup 4. As shown in Fig. 2, two stops 1 6, 1 7, are formed on the spacer 5 so as to limit rotation of the spindle 11 by contact of the lug 1 5 with the stops.The pitch of the thread on the screw-theaded portion 7b and the position of the stops 1 6, 1 7 are arranged such that rotation of the spindle between the limits defined by the stops causes the rod 7 to be screwed into or out of the solenoid by an amount which is equal to or slightly less than the gap present between the disc 6 and the stirrup 4 when the solenoid is not energised.
The position of the rod 7 in the bore 8 is preadjusted by screwing the rod 7 into the bore by hand with the spindle 11 removed, until the end of the rod adjacent to the disc 6 is at a required limit of the useful range of adjustment. The spindle 11 is then pushed over the head portion 7a of the rod with the lug abutting the appropriate stop 1 6 or 1 7.
The spindle may be fitted onto the head 7a in any one of twelve circumferentially spaced positions at 30 intervals by virtue of the twelve V-shaped grooves 14 in the socket 1 3.
This procedure of pre-adjusting the rod 7 will normally be carried out during installation of the device in an apparatus such as an automatic tea-maker.
After installation, the volume of the sound produced by inserting a screw driver or a coin into the slotted head 12, and rotating the spindle to screw the rod into or out of the solenoid between the predetermined limits, so adjusting the gap between the end of the rod 7 and the disc 6. The size of this gap determines the amplitude of vibration of the reed 1 when the solenoid is energised and so determines the volume of the sound produced as the reed vibrates.
Where frequent manual adjustment is required a knob may be fitted onto the spindle.
Claims (8)
1. A sound generating device comprising a solenoid, a reed fixed at one end in a predetermined relationship to the solenoid such that when the solenoid is supplied with alternating current or pulsed direct current the reed is caused to vibrate to produce a sound, and a rod extending through the solenoid with one end of the rod projecting towards the reed and the other end having means of adjusting the amount by which the rod projects towards the reed so as to control the amplitude of vibration of the reed.
2. A device according to Claim 1, in which the rod is formed of a magnetisable material.
3. A device according to Claim 1 or 2, in which the means of adjusting the amount by which the rod projects towards the reed incorporates a screw thread by which the rod is moved into or out of the solenoid on rotation of a spindle.
4. A device according to Claim 3, in which the screw thread is formed on the rod and co-operates with a complementary screwthreaded aperture, and the rotatable spindle engages the rod such that rotation of the spindle causes the rod to rotate.
5. A device according to Claim 3 or 4, in which the spindle has a projection which cooperates with stops which are fixed relative to the solenoid, in order to limit rotation of the spindle.
6. A device according to Claim 5, in which the spindle has a socket at one end to receive an end portion of the rod, this end portion having a plurality of circumferentially spaced ridges which locate in complementary grooves on the inside of the socket whereby the spindle engages the rod.
7. A sound generating device comprising a solenoid having a core of magnetisable material, a reed fixed at one end in a predetermined relationship to the solenoid such that when the solenoid is supplied with alternating current the reed is caused to vibrate to produce a sound, the core being screw threaded into the solenoid with one end of the core projecting towards the reed and the other end of the core engaging a manually rotatable spindle, the spindle being arranged such that rotation thereof screws the core into or out of the solenoid thus varying the amount by which the core projects towards the reed so as to control the amplitude of vibration of the reed.
8. A sound generating device which is substantially as described with reference to and as shown in the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8009397A GB2072405A (en) | 1980-03-20 | 1980-03-20 | Sound generating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8009397A GB2072405A (en) | 1980-03-20 | 1980-03-20 | Sound generating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2072405A true GB2072405A (en) | 1981-09-30 |
Family
ID=10512239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8009397A Withdrawn GB2072405A (en) | 1980-03-20 | 1980-03-20 | Sound generating device |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2072405A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GR20160100633A (en) * | 2016-11-04 | 2018-08-29 | Γεωργιος Πετρου Ποντικας | Bell percussion mechanism with stainless antimagnetic shell and percussion intensity- adjusting means |
-
1980
- 1980-03-20 GB GB8009397A patent/GB2072405A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GR20160100633A (en) * | 2016-11-04 | 2018-08-29 | Γεωργιος Πετρου Ποντικας | Bell percussion mechanism with stainless antimagnetic shell and percussion intensity- adjusting means |
| GR1009670B (en) * | 2016-11-04 | 2020-01-07 | Γεωργιος Πετρου Ποντικας | Bell percussion mechanism with stainless antimagnetic shell and percussion intensity- adjusting means |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3894232A (en) | Rotationally adjustable support mechanism | |
| US2545514A (en) | Anchoring device | |
| JPS6146828B2 (en) | ||
| GB2072405A (en) | Sound generating device | |
| US2919624A (en) | Apparatus for inspecting material | |
| US3530463A (en) | Buzzer having spring blade vibrating at natural frequency | |
| US5052262A (en) | Cymbal tilt adjustment mechanism | |
| US4334204A (en) | Proximity switch assembly | |
| US2471838A (en) | Pressure switch | |
| US2467073A (en) | Magnetic control mechanism | |
| US4340919A (en) | Head adjustment mechanism | |
| CN107942470B (en) | Fine adjustment device and method for reflector | |
| US20140311279A1 (en) | Apparatus for on demand limiting the value range of a parameter adjustment device | |
| EP0363055A3 (en) | Electron gun and process of producing same | |
| JP2006317810A (en) | Adjusting method for contact point gap of flat type sound alarm device and adjusting jig | |
| US2399977A (en) | Metal disintegrating device | |
| EP1215015A3 (en) | Method and device for interrupting the feeding movement | |
| US4409589A (en) | Adjustable electric bell | |
| US1241756A (en) | Wire coiling and clamping device. | |
| JP2510704Y2 (en) | Oil reduction detector | |
| US3405590A (en) | Tuner for stringed musical instruments | |
| SU1252819A1 (en) | Apparatus for forming coating on elongated articles | |
| SU1307494A1 (en) | Device for tuning waveguide path | |
| JPH0675578A (en) | Electronic buzzer | |
| SU1687941A1 (en) | Adjustable stop |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |