Solenoid Door Locks
Dear Ken,
A couple of options come to mind:
- Obviously, the thing you are looking for is a "Solenoid Door Lock". Using variations on those terms should get you something relevant.
- Consider both Home door lock options, and Car Door lock/unlock mechanisms, they effectively do what you need them to, are in the size/strength range you're looking at, and can have manual-override handles attached to the moving "shot bolt" section without too much issue. (The typical modeller is inventive enough to work-out a solution ).
- a search of Radio-Shack found this
http://www.radioshack.com/product/index.jsp?productId=25085346
What it actually requires in terms of drive signal I do not know, but it's a start.
- Amazon
http://www.amazon.com/Amico-Open-Frame-Solenoid-Electric/dp/B005FOTJF8
- Instructables how-to
http://www.instructables.com/id/Build-a-Remote-Control-Deadbolt/
/> (NB plenty of room to add a "manual over-ride" handle to the locking bolt)
- Images
https://www.google.com.au/search?q=door+lock+solenoid&safe=off&espv=2&biw=1280&bih=642&tbm=isch&tbo=u&source=univ&sa=X&ei=oujmU5GSHs_q8AXL8oGICg&ved=0CBsQsAQ
- YT example, while powered by Rasberry Pi, the mechanicals are of interest
- Of course, if you're comfy with magnet wire, brass tube, and a portion of steel rod, you could simply "wind your own"?
https://www.google.com.au/search?q=two+coil+homemade+solenoid&safe=off&espv=2&biw=1280&bih=642&tbm=isch&tbo=u&source=univ&sa=X&ei=ienmU4bgDMbo8AXD7IHwDw&sqi=2&ved=0CBsQsAQ
http://www.electronicspoint.com/threads/homemade-solenoid-coil.10505/
Indeed, if "emergency egress" is the priority, even a single-coil solenoid + and spring acting on the steel slug would work.
- spring pushes the slug "open" allowing door movement
(this is the "default" condition)
- apply power = magnet ON = slug "closed" = door locked
(maybe tie in with basic layout power, so that if the layout is OFF, the lock is "open").
Just some thoughts, hope this helps...
Happy Modelling,
Aim to Improve,
Prof Klyzlr
PS Things to note:
- when the bolt tries to slide into "locked" position, the alignment of the door and the shot-bolt needs to be quite good. If not, the bolt will not move the entire way, and will not give positive locking.
- equally, if in a panic, a person is pushing/pulling on the door,
the bolt may be jammed in the "locked" position, and the mechanism not-strong-enough to slide it free against the additional friction. The person needs to release the sideways pressure on the door, and the bolt will slide free into the "open" position.
(if they remove their hands from the door to operate the "emergency over-ride" handle, the pressure will be released in consequence... ).
- instead of a "shot bolt", what about a hospital-type magnetic door lock?
Viz:
- The door has a metal plate mounted to it,
- and a powerful electromagnet is mounted in-alignment with the plate, stationary to the door frame or the floor
- If the magnet is ON, the door is "Held closed",
(but can be "kicked open" with enough force if needs be,
as soon as you break the magnet's hold,
the rapid increase in distance magnet<> steel-plate will greatly reduce the magnet's attractive force),
and when the magnet is OFF, the door can swing freely as normal/expected...
http://keyeslifesafety.com/tag/door-locks/
http://keyeslifesafety.com/wp-content/uploads/2012/02/2-magnetic-door-locks-11.jpg
http://www.sdcsecurity.com/newproducts.htm
/> (scroll down to "EH series magnetic Door Holder",
interesting solenoid option immediately above!)
http://www.olideautodoor.com/magnetic-lock-for-sliding-doors/