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Patent: Circuit Control Device

Patent: Circuit Control Device - cover thumbnail  

"Another object is to provide a time control circuit device that is free from complexity and economical to manufacture."

Patent: Circuit Control Device
US No. 2,207,189
Walter C. Austin & Webster Hill
July  1940
Patent, 3 pages

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About this title

Application for patent filed August 15 1938; patent granted July 9 1940.

"This invention relates to a circuit controlling device, and more specifically to that type of device used for the time control of electric circuits. An object of the invention is to provide an improved control means capable of making or disrupting a circuit after a predetermined interval has elapsed. A further object of the invention is concerned with an improved device capable of controlling a circuit over a predetermined interval of time, and in which said interval can be varied."

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Patent: Circuit Control Device
Submission date: 17/07/2016
A backup copy has been saved as:
TitleID: 1479 | Filesize: 382KB
Credit*: Pit
Format: PDF
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User comments:

Oh yes, the infamous Austin timer, an instrument of torture introduced during the Inquisition to punish unbelievers. AMA rules required a timed engine run for free flight events, starting at 30 seconds and getting shorter as the engines developed more power. I never had one of these, preferring the more reliable Tatone clockwork timer, which was actually a modified camera timer. Austins had a tendency to stick, allowing your engine to run until out of fuel and out of sight, never to be seen again. Those who were lucky enough to have their model found miles away sometimes got the remains back, usually water soaked and rusty, from the AMA address tag inside. Believe it or not, these are still available, not for model airplane use though. I ran into some of them in my day job, used as timers on electric locks. The locks were installed on doors as part of a card reader access control system. The fire codes mandated an emergency egress button be installed near the door to let you out if something went wrong with the system. Of course they tended to stick just like the ancient Austins did, never allowing the door to re-lock after the required 30 seconds. We found the fire code required a minimum of 30 seconds exit time before re-locking but there was no maximum, so we installed a switch that would latch when pushed until reset by twisting the button. Of course, the first day all the buttons would get pushed by the cleanup crew, so we had to install buzzers to alert the staff when someone mistakenly pushed the button. The system would send an alarm to the guard desk when the emergency exit was activated, but it all worked a lot better than the pneumatic timer. Austin's main failing was the way it was designed in the first place. When you activated the Austin timer, a spring pushed a plunger down thru an airtight tube until it got to the bottom. A tiny adjustable orifice regulated how long it took the air pressure to bleed down. ANY kind of dirt or dust would clog up the orifice and the whole mess would hang up. Sheet rock dust is what ruined our modern day timers just like the antique Austins.
DougSmith - 18/07/2016
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