GB572554A - Improvements in or relating to electric alarm clocks - Google Patents
Improvements in or relating to electric alarm clocksInfo
- Publication number
- GB572554A GB572554A GB1700243A GB1700243A GB572554A GB 572554 A GB572554 A GB 572554A GB 1700243 A GB1700243 A GB 1700243A GB 1700243 A GB1700243 A GB 1700243A GB 572554 A GB572554 A GB 572554A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- electric alarm
- relating
- alarm
- alarm clocks
- 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
- G04—HOROLOGY
- G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
- G04C21/00—Producing acoustic time signals by electrical means
- G04C21/02—Constructional details
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Treatment Devices (AREA)
- Rehabilitation Tools (AREA)
Abstract
572,554. Electric alarm clocks. SMITH & SONS (ENGLAND), Ltd., S. [formerly SMITH & SONS (MOTOR ACCESSORIES), Ltd., S.], and RUSSELL, V. J. S. Oct. 15, 1943, No. 17002. [Class 118 (ii)] In an electric alarm clock having an electromagnetic alarm, e.g. a buzzer operated by an electromagnet 12, in series with the motor 20, e.g. a self-starting A.C. synchronous motor, driving the clock mechanism, adjustable means are provided for varying the inductance of the alarm device and hence the current through the motor. These means may comprise a screw 16 formed of magnetic material and adjustably secured in one limb of the core of the magnet so that by varying the distance between the end of the screw and the other limb the inductance is varied. The armature 17 may be mounted as described in Specification 571,082.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1700243A GB572554A (en) | 1943-10-15 | 1943-10-15 | Improvements in or relating to electric alarm clocks |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1700243A GB572554A (en) | 1943-10-15 | 1943-10-15 | Improvements in or relating to electric alarm clocks |
Publications (1)
Publication Number | Publication Date |
---|---|
GB572554A true GB572554A (en) | 1945-10-12 |
Family
ID=10087476
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1700243A Expired GB572554A (en) | 1943-10-15 | 1943-10-15 | Improvements in or relating to electric alarm clocks |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB572554A (en) |
-
1943
- 1943-10-15 GB GB1700243A patent/GB572554A/en not_active Expired
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