GB2022292A - Timing systems - Google Patents

Timing systems

Info

Publication number
GB2022292A
GB2022292A GB7918212A GB7918212A GB2022292A GB 2022292 A GB2022292 A GB 2022292A GB 7918212 A GB7918212 A GB 7918212A GB 7918212 A GB7918212 A GB 7918212A GB 2022292 A GB2022292 A GB 2022292A
Authority
GB
United Kingdom
Prior art keywords
motor
lamp
ambient light
timing
windings
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.)
Granted
Application number
GB7918212A
Other versions
GB2022292B (en
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.)
Smiths Group PLC
Original Assignee
Smiths Group PLC
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 Smiths Group PLC filed Critical Smiths Group PLC
Priority to GB7918212A priority Critical patent/GB2022292B/en
Publication of GB2022292A publication Critical patent/GB2022292A/en
Application granted granted Critical
Publication of GB2022292B publication Critical patent/GB2022292B/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C23/00—Clocks with attached or built-in means operating any device at preselected times or after preselected time-intervals
    • G04C23/38—Mechanisms measuring a chosen time interval independently of the time of day at which interval starts

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)

Abstract

A timing system for a lamp 4 or other electrical equipment has a control circuit connected in series between the lamp and an electrical power supply 5 and 6. The system has a switching circuit 1 including an SCR 14 that is switched on to illuminate the lamp when ambient light falls below a predetermined level, and a timing circuit 2 that includes a synchronous motor 30 having two sets of windings 32 and 33 which provide first and second timers respectively. The motor 30 is driven by energisation of either one of windings 32 or 33 and controls via cams or levers the switching of a two-way switch 40. In operation, when ambient light falls to a predetermined level, the lamp 4 is illuminated and motor winding 32 is energized. After a first predetermined interval the motor driven cam causes the lamp to be switched OFF and changes over switch 40 to cause energization of winding 33 instead of 32 and the motor continues to rotate. After a second predetermined interval has elapsed the motor driven cam is returned to its original setting, switch 40 being returned to contact 41 and rotation of the motor is stopped until the ambient light level falls again. The timing operation is then repeated. <IMAGE>
GB7918212A 1978-05-26 1979-05-24 Timing systems Expired GB2022292B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7918212A GB2022292B (en) 1978-05-26 1979-05-24 Timing systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2296378 1978-05-26
GB7918212A GB2022292B (en) 1978-05-26 1979-05-24 Timing systems

Publications (2)

Publication Number Publication Date
GB2022292A true GB2022292A (en) 1979-12-12
GB2022292B GB2022292B (en) 1982-07-14

Family

ID=26256217

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7918212A Expired GB2022292B (en) 1978-05-26 1979-05-24 Timing systems

Country Status (1)

Country Link
GB (1) GB2022292B (en)

Also Published As

Publication number Publication date
GB2022292B (en) 1982-07-14

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee