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Old 07-31-2008, 08:04 PM
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linear actuator override

I am planning to put a power toneau with a linear actuator, my question is if it fails for some reason how could you override it to get the cover open?

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Old 08-01-2008, 10:34 PM
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bump, anyone?
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Old 08-01-2008, 11:00 PM
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In fail safe mode, motor would probably lock. To turn it by hand, using a ratchet drive stuck in the end of the drive tube or motor side, would be the only way to retract it.

Are you using a track on either side for alignment? What material you using for tonneau?

Check out tubular motors or try this site: http://www.wistarmotor.com/newEbiz1/...tml/index.html

or http://www.dclinearactuators.com/

or http://firgelliauto.co.uk/show_info.php?page_id=4

Last edited by alittle1; 08-01-2008 at 11:15 PM.
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Old 08-01-2008, 11:40 PM
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Mount the actuator so that you can access the mounting screws from the underside of your compartment.. Then if the actuator fails you can unfasten it and lift the tonneau.

There are some ballscrew type actuators that will allow the moving end to extend manually, but those are typically expensive heavy duty industrial units that you won't find at an automotive type supplier.

Another drawback to the ballscrew type is that they provide movement of the load in one direction only, and won't hold the lid down, so you will need a latching mechanism.

Hope this helps..
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Old 08-05-2008, 07:04 AM
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thanks, I am sure this has happened to someone before. just trying to build in safeguards.
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Old 08-05-2008, 09:40 AM
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Assuming this is a pickup truck tonneau cover; it would be convenient if the mounting location on the bedside would be accessable thru the wheel well thus hidden from view by the rear fenders. Gonna put 2 actuators on ?
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Old 08-05-2008, 06:07 PM
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Quote:
Originally Posted by Fergusonic
Assuming this is a pickup truck tonneau cover; it would be convenient if the mounting location on the bedside would be accessable thru the wheel well thus hidden from view by the rear fenders. Gonna put 2 actuators on ?
no probably just one in the center. I could make the fastener acessible under the bed but the runnining boards are about 4 inches off the ground (50 chevy) what happens if you do it for your hood?
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Old 08-05-2008, 11:06 PM
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I don't have a solution but I thank you for bringing it up. I too have been kicking around using such motors for doing something interesting. I never thought of the failure possiblities. I can see in certain setups that would be at the very least pretty darn annoying and in others make something like a pickup truck tonneau cover just plain locked down and inaccessable.
Definitely food for thought. Many such actuators do NOT move without power. And if they can be moved with a tool that would be no help if you couldn't get at them.
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Old 08-05-2008, 11:48 PM
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Very interesting thread. A friend of mine has 2 linear actuators under his tonneau (52 ford). I never thought about how he would get it open if the battery was dead or the circuit fried.

I was planning on building one like his when I get to the paint stage on mine.


Please post up if you get something to work well.

For mine...maybe have the fasteners accessable under the rear fender like Mikey said would work.
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Old 08-06-2008, 01:00 AM
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linear actuator fail/safe

How about some kind of latch at the "upper" end that can be released by yanking a wire hidden behind a tailite or tucked into the side of the rear gate? I'm thinking of something along the lines of power garage door openers that can be released from the power track by tugging on the cord that hangs down from the slider.

This way, in full failure mode, you yank the wire/cord/rope/whatever and release the tonneau cover from the actuators, allowing it to be lifted by hand to access the mechanism

Just trying to "think outside the (pickup) box!"
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Old 08-06-2008, 06:23 PM
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Quote:
Originally Posted by Brian_B
Very interesting thread. A friend of mine has 2 linear actuators under his tonneau (52 ford). I never thought about how he would get it open if the battery was dead or the circuit fried.

I was planning on building one like his when I get to the paint stage on mine.


Please post up if you get something to work well.

For mine...maybe have the fasteners accessable under the rear fender like Mikey said would work.
under the fenders may be possible if you use 2 actuators. I read it may be hard to get them both adjusted and synchronized if you use 2
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Old 08-09-2008, 05:11 PM
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this is an idea , how about putting one of the pivot points in a bear claw latch and have a cable to release the latch hidden somewhere, so if there is a problem all you would have to do is pull the release and the actuator would be free. just a thought. Let us know what you come up with.
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Old 08-11-2008, 10:58 PM
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Quote:
Originally Posted by 71-78malibu
this is an idea , how about putting one of the pivot points in a bear claw latch and have a cable to release the latch hidden somewhere, so if there is a problem all you would have to do is pull the release and the actuator would be free. just a thought. Let us know what you come up with.
that might be an idea, then I could just use one actuator as planed. the truck will be to low to get under and unbolt the mount and my gas filler will be in the bed, so need a backup.
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