GB543590A - Improvements in or relating to apparatus for producing audible signals - Google Patents
Improvements in or relating to apparatus for producing audible signalsInfo
- Publication number
- GB543590A GB543590A GB13682/40A GB1368240A GB543590A GB 543590 A GB543590 A GB 543590A GB 13682/40 A GB13682/40 A GB 13682/40A GB 1368240 A GB1368240 A GB 1368240A GB 543590 A GB543590 A GB 543590A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- contacts
- arm
- stop
- speed
- 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
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B3/00—Audible signalling systems; Audible personal calling systems
- G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Electromechanical Clocks (AREA)
Abstract
543,590. Signalling by audible signals. COMPTON ORGAN CO., Ltd., J., and FAIR. W. T. H. Aug. 31, 1940, No. 13682. [Classes 40 (i) and 118 (ii)] Apparatus for producing audible signals, particularly air-raid warnings, comprises an electric sound generator rotated by a motor, and means for alternately energizing and deenergizing the motor thereby varying the speed of the generator and producing a note of undulating pitch. The generator may be of the kind described in Specifications 403,444 and 433,050 in which a number of rings are employed to generate undulating electric potentials. The generator is rotated by an electric motor 4 and is connected to a source of potential 2 and one or more loudspeakers 3. The motor is connected to a source of power 5 through a throwover switch with two sets of contacts one of which, 8, is connected to the motor by leads 6, 7. When the contact is closed, the motor rotates at a steady speed and the " all clear " signal is given by the loudspeaker 3. The contacts 12 are connected to the motor by leads 9, 11, and contacts 10 which are opened and closed intermittently to vary the speed of the motor to give the "take-cover" signal. This is effected by a centrifugal governor 13, on the shaft of the motor, which is provided with a disc 14 that moves axially along the shaft. The disc oscillates a pivoted arm 15 which is connected by a blade spring 19 with another pivoted arm 16. One end of the arm 16 operates the contacts 10, and the other end is provided with a stop 21 that engages a stop 20 on the arm 15. In operation, when the contact 12 is closed, the speed of the motor increases and the arm 15 is rocked. At a particular speed, the stop 20 moves clear of the stop 21 and the spring 19 moves the arm 16 to a position at which it opens the contacts 10. The speed of the motor then decreases until the stop 20 has again moved clear of the stop 21 when the spring 19 moves the arm 16 to a position at which the contacts 10 are closed. If desired, the contacts 10 may be replaced by a mercury switch mounted on the arm 16. A multi-pole switch 23 may be provided to enable any generator ring, or selection of rings, to be connected to the source of potential 2 so that any tone pitch may be produced. The sound produced may ' be made intermittent, for " imminent peril" warnings for example, by operating a pair of contacts 26 by a rotating cam 27. A number of cams may be used to repeat a given cycle of tone pitches, and according to the Provisional Specification the device may be arranged to transmit Morse signals.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB13682/40A GB543590A (en) | 1940-08-31 | 1940-08-31 | Improvements in or relating to apparatus for producing audible signals |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB13682/40A GB543590A (en) | 1940-08-31 | 1940-08-31 | Improvements in or relating to apparatus for producing audible signals |
Publications (1)
Publication Number | Publication Date |
---|---|
GB543590A true GB543590A (en) | 1942-03-04 |
Family
ID=10027486
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB13682/40A Expired GB543590A (en) | 1940-08-31 | 1940-08-31 | Improvements in or relating to apparatus for producing audible signals |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB543590A (en) |
-
1940
- 1940-08-31 GB GB13682/40A patent/GB543590A/en not_active Expired
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB543590A (en) | Improvements in or relating to apparatus for producing audible signals | |
US3820105A (en) | Electric signaling device for alarm clocks | |
GB528000A (en) | Improvements in and relating to apparatus for supervising the speed of revolution of engines and machines | |
US3322876A (en) | Electro-acoustic generator adapted to produce low frequency signals transformable into musical sounds by means of any amplifiers | |
US1343754A (en) | Apparatus for teaching codes as used in telegraphy | |
US990796A (en) | Drum-actuated alarm. | |
US1325354A (en) | Speed-determining | |
US1045909A (en) | Synchrorotor. | |
US2473749A (en) | Telegraphic code teacher | |
US1056892A (en) | Apparatus for producing tone effects in wireless telegraphy. | |
US1459876A (en) | Alarm-controlling mechanism for clocks | |
US1342863A (en) | Sounding signaling device | |
US269124A (en) | Paul seiler | |
US490014A (en) | Electric telemeter system | |
US1294691A (en) | Selecting device for electric bells and the like. | |
US400523A (en) | Harmonic telegraphy | |
US1733078A (en) | Apparatus for measuring the period of reciprocating bodies | |
US906405A (en) | Means for electrical transmission of designs, figures, and photographs. | |
US1978828A (en) | Apparatus for transmitting music by radio | |
GB619299A (en) | Improvements in or relating to apparatus for displaying information for advertising or other purposes, for example, announcing | |
US923122A (en) | Mechanically-actuated diaphragm horn or alarm. | |
US1529432A (en) | Radio sound transmitter | |
US1394768A (en) | Instrument for use in learning telegraphy | |
US1548300A (en) | Testing device | |
US1068939A (en) | Alarm or signaling apparatus. |