GB696588A - Improvements in or relating to dial switches for use with coin-box telephone instruments - Google Patents
Improvements in or relating to dial switches for use with coin-box telephone instrumentsInfo
- Publication number
- GB696588A GB696588A GB2802650A GB2802650A GB696588A GB 696588 A GB696588 A GB 696588A GB 2802650 A GB2802650 A GB 2802650A GB 2802650 A GB2802650 A GB 2802650A GB 696588 A GB696588 A GB 696588A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pawl
- dial
- teeth
- flange
- spring
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M17/00—Prepayment of wireline communication systems, wireless communication systems or telephone systems
- H04M17/02—Coin-freed or check-freed systems, e.g. mobile- or card-operated phones, public telephones or booths
- H04M17/026—Constructional features
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Computer Security & Cryptography (AREA)
- Signal Processing (AREA)
- Prepayment Telephone Systems (AREA)
- Control Of Vending Devices And Auxiliary Devices For Vending Devices (AREA)
Abstract
696,588. Impulse transmitters. AUTOMATIC TELEPHONE & ELECTRIC CO., Ltd. Nov. 14, 1951 [Nov. 16, 1950], No. 28026/50. Class 40 (iv). In order to prevent fraudulent calls the dial of a coin-box telephone set can be advanced only from its normal position. A disc 40 secured to the dial shaft 10 has a flange 47 turned away from the finger-plate and provided with teeth 48. A pawl 50 rigid with an arm 55 loaded by a spring 53 is hinged on a pivoted member 52 which normally is held by the spring 53 against a stop. The pawl 50 rests in a gap in the flange. When the dial is advanced from its normal position the pawl rides over the teeth 48. At the start of the return movement, one of the teeth 48 rotates the pawl 50 and the member 52 in a clockwise direction until the member 52 is snapped back to its rest position by the spring 53. Should an attempt be made to advance the dial before it has been allowed to return completely this will be prevented by engagement of the pawl 50 against a tooth 48. It is arranged that the cam-operated contacts removing the short-circuit on the impulsing contacts when a free call digit is dialled are reclosed before the pawl 50 drops into the gap in the flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2802650A GB696588A (en) | 1950-11-16 | 1950-11-16 | Improvements in or relating to dial switches for use with coin-box telephone instruments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2802650A GB696588A (en) | 1950-11-16 | 1950-11-16 | Improvements in or relating to dial switches for use with coin-box telephone instruments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB696588A true GB696588A (en) | 1953-09-02 |
Family
ID=10269065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2802650A Expired GB696588A (en) | 1950-11-16 | 1950-11-16 | Improvements in or relating to dial switches for use with coin-box telephone instruments |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB696588A (en) |
-
1950
- 1950-11-16 GB GB2802650A patent/GB696588A/en not_active Expired
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