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Great Idea, Charlie.
I think I get the idea from your description. Makes it an automatic safety feature - unlike poles which I would have to remember to pull down and which gravity might catch some fellow underneath (like me). If I have the idea correct, this half pipe simply sits on top of the retracted rod/cylinder when the door is closed and when it opens, the rod/door pulls this half pipe up until it is past the end of the cylinder whereupon the pipe drops down on the rod just in front of the front surface of the cylinder resting lightly on the rod. Then retracting slightly would have the pipe pinned against the front of the cylinder.
Even if a gust of wind momentarily lifted the door slightly the pipe should stay in position - I like it.
Might glue some rubber on inside so pipe would not mar rod.
Whether you though of it originally or not you get my credit.
Thanks Charlie
Ed
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----- Original Message ----- From: "Charlie England" <ceengland@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, August 15, 2006 8:03 PM
Subject: [FlyRotary] Re: Emailing: DoorOpenLside.jpg
Ed Anderson wrote:
Hi Ben, good question concerning safety. The door hydraulic cylinders are single acting push-only. A restrictor valve holds the door open and a push of a button opens the value to let the fluid back into the tank thereby lowering the doors. The doors do not slam down but do come down within 10-15 seconds (will have to time and see exactly how long it takes).
But, regardless of double acting or single acting if a hose breaks you could be in trouble as you suggest. I intend to have 9-10 foot pipes attached to main beam that when the door is open, I can pull down and set to hold the door up. That way should a hose fail the door won't slam down. These are 4000 psi bursting lines with 450 psi maximum pressure - so hopefully I am not over stressing them.
It could certainly ruin your day to have that door come down on you.
Thanks for mentioning it - safety is always a high concern.
Ed
Hi Ed,
The door looks great. FWIW, you might be able to mechanically 'safety' the hydraulic cylinders with tubes over the cylinders themselves. If the business end of the cylinder is more or less flat, the tube would be big enough to slide over the cylinder but slightly shorter than the ram stroke & be hinged on the same pin that holds the ram to the door. When the ram extends, gravity pulls the free end off-center & it will prevent the ram from retracting. (not my idea; it's on some gas struts on some of our equipment at work)
More details available, but I'm too lazy to type them all. Give me a call if you're interested.
Charlie
601-879-9596 until 7:30 pm or 601-351-066 tomorrow morning after 2:00 AM
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