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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20322  
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Could you not maybe use regular door locking actuators then modify them and add a locking mech that they can lock / unlock.
No doubt those cost a fortune though... Just an idea, hard to think about unless you see what your actually dealing with. |
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30th May 2015 4:28pm |
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| Gareth Member Since: 12 Dec 2011 Location: Bramhall Posts: 1099 
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That'll confuse the pikeys
However, what if you run out of air and can't unlock it? 2021 Defender 110 X-Dynamic HSE D300 MHEV 1966 S2a 109 aka Betsy 1968 S2a 88 aka Bob 2014 Jaaaag F Type 3.0 Supercharged. |
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30th May 2015 4:59pm |
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| mikeh501 Member Since: 07 Jan 2013 Location: United Kingdom Posts: 1142
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so if you lose air pressure do you get locked in or out?
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30th May 2015 9:34pm |
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| bluebottle Member Since: 08 May 2015 Location: Not in my Landy enough! Posts: 705
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I imagine for UK road safety purposes you'd need to have a system where the doors failed safe, so they unlocked in the event of a crash... Although if you could get away with it, the better system would be akin to railway brakes - the doors are locked by default and a vacuum created to unlock them, as the power is only required to create the vacuum for the relatively short period of time when the door goes from the open to shut (or vice versa) position.
I'm sure there could be a way to conceal an override valve or something in case you got locked in or out. |
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30th May 2015 10:26pm |
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| AndrewS Member Since: 10 Apr 2007 Location: Hereford Posts: 3707 
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To answer the above few comments:-
custom90steve Regular door locking actuators are too expensive and it would take a lot of engineering to make them work and I don't think there is room enough. Gareth The air tank outlet can also be used to fill the tank should it be required. mikeh501 The cylinders are not spring loaded either way so they will remain in the last position selected should an air loss situation arise. So I could get locked out (if I include the front doors) or not be able to lock the doors if air is lost. Perhaps I should hide a foot pump on the vehicle should an air loss situation occur 
bluebottle The rear doors on the side open to an area that is not accessible to the main interior of the truck ie it opens to shelving, the rear upward opening door and tailgate would be difficult to access as an escape route in the event of a crash. Also the 'air door locks' will only be operated whilst the car is parked and locked, not whilst on the move or with operatives inside. So I'm not concerned about the 'failed safe' requirement. With regard the the vacuum option, the doors will be open for long periods when on site so I don't think this will be viable. For clarification the 'air door locks' are only there as a layer of security for when the vehicle is parked in a vulnerable situation as the AFN supplied rear key operated door locks are not good enough IMO. Please also note that the tailgate doesn't even have a lock. 130's have feeling's as well you know  |
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31st May 2015 9:28am |
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| trackm90 Member Since: 24 Jun 2012 Location: Salisbury Posts: 3
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A few thoughts, during the eighties I built several air locking systems for vehicles with valuable cargo etc. Very simple and reliable. The air cylinder piston rod is used a a bolt between door and frame. If two cyls are used or one driving several bolts on land rover doors, it prevents them being stolen even if hinges are removed! there are several ways of being able to provide an overide in event of failure. If you want small cylinders have a look at Clippard pneumatic s.
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31st May 2015 3:35pm |
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