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AeroElectric-List Digest: 13 Msgs - 04/27/06

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tlamp(at)genesishcs.org
Guest

Posted: Fri Apr 28, 2006 3:27 am Post subject: AeroElectric-List Digest: 13 Msgs - 04/27/06

Joe here is a picture of my install.



http://home.columbus.rr.com/tlamp/mvc-398f.jpg



and my entire construction page of the Long EZ at:



http://home.columbus.rr.com/tlamp/planpics.htm



I'm sure you have seen this type before, it has the typical microswitch

located behind the latch.



I think it would be better if I also had a magnetic switch inline to also

verify that the canopy is shut, as the latch can be locked and the canopy

not captured. It is pretty obvious if that happens, but it would be a safer

installation.



Terry Lamp

Long EZ N977JT

Ohio



________________________________  Message 5

_____________________________________

Time: 09:24:26 AM PST US

From: Joe Dubner <jdubner(at)yahoo.com>

Subject: Canopy Latched Sensor






I'm looking for a better way to implement the canopy unlatched warning

system on a Long-EZ.  The standard method is to use a small microswitch

that responds to "canopy latched".  (This is not the same as "canopy

closed", which would be easy enough to implement but I want a "latched"

indication.)



Here's an illustration of the standard system:

http://users.lewiston.com/hth/jd/CanopyLockMicroswitch.jpg



When the canopy locking handle is pushed forward (left in the image) far

enough to latch the canopy locking mechanism, the head of the screw on

the handle (at the right in the image) fits in the hole on the latch and

actives the microswitch through its (specially bent) lever.



I'm not happy with the microswitch as it doesn't hold up well under use

and wonder if any Aeroelectric Connection readers can come up with a

better idea.  I've searched for optical interrupters but can't find one

with a gap large enough for the head of the relatively large #10 screw.

 I'm not familiar with any specific reflective-type optical sensors but

I'm guessing that would be the way to go.



Any ideas?



Thanks,

Joe

Long-EZ 821RP

Lewiston, ID

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echristley(at)nc.rr.com
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Posted: Fri Apr 28, 2006 5:09 am Post subject: AeroElectric-List Digest: 13 Msgs - 04/27/06

AeroElectric-List Digest Server wrote:



 	  Quote: 	
		  ________________________________  Message 8  _____________________________________

Time: 03:22:31 PM PST US

From: Joe Dubner <jdubner(at)yahoo.com>

Subject: Re: Canopy Latched Sensor






Thanks, Dave but the metal-to-metal contact isn't reliable.  The screw

head fits loosely inside the hole in the latch and the screw's grip

doesn't necessarily make solid contact with the edge of the .020" SS

latch.  And there's no pressure on the "contacts".



Still looking for an optical solution ...



  



Make a "washer" from the .020" SS, one that has a long tab coming out 
	


one side.  Put the tab under the screwhead and arrange it so that the 

tab interrupts the optical sensor.



-- 

         ,|"|"|,               Ernest Christley     |

----===<{{(oQo)}}>===----     Dyke Delta Builder    |

        o|  d  |o          www.ernest.isa-geek.org  |

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jdubner(at)yahoo.com
Guest

Posted: Fri Apr 28, 2006 2:27 pm Post subject: AeroElectric-List Digest: 13 Msgs - 04/27/06

 	  Quote: 	
		   


	


 	  Quote: 	
		   Make a "washer" from the .020" SS, one that has a long tab coming out 

 one side.  Put the tab under the screwhead and arrange it so that the 

 tab interrupts the optical sensor.


	


There isn't enough clearance for a tab, long or short, coming out one

side as the head of the screw is nearly in contact with the latching

mechanism.  When latched, the head actually passes through the hole in

the latch but "enroute" to latching, it drags across the surface of the

latch mechanism until it "drops into" the hole.  The latching mechanism

is "springy" SS (.020").



I've received some good ideas but what I really want is an optical

solution, with no metal-to-metal contact.



Apparently an optical interrupter approach is out because of the

clearance involved (the gap is far too tiny for the head of the #10

screw).



But what about a reflective optical sensor?  It would mount on the

inside of the hinged door (which is open in the photo) and see nothing

under unlatched conditions.  When the canopy is latched, the head of the

screw would reflect light and activate the sensor.



Has anyone done this?  I see lots of datasheets for reflective optical

sensors but I don't know specifically which ones are readily available,

inexpensive, long focal length, useful and stable output level, etc.

Does anyone have real-world experience with one and can recommend a

specific part number?



Thanks,

Joe

http://users.lewiston.com/hth/jd/CanopyLockMicroswitch.jpg

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mprather(at)spro.net
Guest

Posted: Fri Apr 28, 2006 3:59 pm Post subject: AeroElectric-List Digest: 13 Msgs - 04/27/06

I found that digikey has a large variety of slot type optical switches for

reasonable prices.  So far, it seems that all of them would require just a

tiny bit of glue logic to make them work.



Mechanically, instead of configuring the switch so that the screw head

interrupts the LED beam, design a lever arrangement which causes a flag to

be actuated when the screw head is in position.



Attempt at a picture which might be worth a few hundred words:



http://www.webpak.net/~mprather/Share/switch.jpg



When the screw head is in the latched position, the flag is moved such

that light passing between trasmitter and receiver are interrupted.  Drawn

in the unlatched position.

Regards,



Matt-

 	  Quote: 	
		   



> 

> <echristley(at)nc.rr.com>



> Make a "washer" from the .020" SS, one that has a long tab coming out

> one side.  Put the tab under the screwhead and arrange it so that the

> tab interrupts the optical sensor.



 There isn't enough clearance for a tab, long or short, coming out one

 side as the head of the screw is nearly in contact with the latching

 mechanism.  When latched, the head actually passes through the hole in

 the latch but "enroute" to latching, it drags across the surface of the

 latch mechanism until it "drops into" the hole.  The latching mechanism

 is "springy" SS (.020").



 I've received some good ideas but what I really want is an optical

 solution, with no metal-to-metal contact.



 Apparently an optical interrupter approach is out because of the

 clearance involved (the gap is far too tiny for the head of the #10

 screw).



 But what about a reflective optical sensor?  It would mount on the

 inside of the hinged door (which is open in the photo) and see nothing

 under unlatched conditions.  When the canopy is latched, the head of the

 screw would reflect light and activate the sensor.



 Has anyone done this?  I see lots of datasheets for reflective optical

 sensors but I don't know specifically which ones are readily available,

 inexpensive, long focal length, useful and stable output level, etc.

 Does anyone have real-world experience with one and can recommend a

 specific part number?



 Thanks,

 Joe

 http://users.lewiston.com/hth/jd/CanopyLockMicroswitch.jpg

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