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Low voltage connector

Discussion in 'Electronic Basics' started by d, Jan 29, 2004.

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  1. d

    d Guest

    Greets to all,

    I need to pass 12V current from a chassis to a door. I would like the
    door to have a spring loaded contact that would complete the circuit
    when the door is closed by making contact with a flat contact in the
    chassis. I'd thought such things would exist, but can't seem to find
    them. I am getting desperate for a solution as the product I am
    designing is already in production and without a comparable solution,
    I will be forced to use grommets and run wire through the door into
    the chassis.

    Any help or direction is greatly appreciated.....

    Dave
     
  2. These were used in car doors at one time.
     
  3. Greg Neill

    Greg Neill Guest

    Forget running the wire to the door and use instead
    a magnetic reed switch on the door frame. The only
    thing you need connect to the door is a small magnet.
     
  4. d

    d Guest

    Great, but I need power inside the door that originates from inside
    the chassis. It would be fine if the power to the door was always on,
    but the way I envisioned the contacts, this would not be the case.
     
  5. d

    d Guest

    I heard there was an application for car audio that had similiar
    components, but have been unable to locate. Perhaps I'm not using the
    correct keys in my search.....
     
  6. d

    d Guest

    A good example of the concept is the PENN ENGINEERING Waveguard
    grounding system (PN:
    DPRS-375-ZI)http://www.pennfast.com/design_info/partdescription.html.
    Unfortunately, it is too large and is not isolated.
     
  7. I have seen a spring loaded contact mounted in a nylon housing that
    snaps into the door post on vans, and a mating contact that mounted in
    the door for the license plate light. Another method was a small close
    wound spring for the ground contact, and a wire run inside the spring.
    This method was more reliable, but the spring could get in the way. it
    would depend on your design. If this is a low current application, you
    might consider the "Pogo Pins" used in bed of nail test fixtures. Not
    cheap, but fairly reliable.
     
  8. d

    d Guest

    Thanks for your help. I knew something like it had to exist. The pem
    product would work, but it's just too big. This is for a computer, so
    I can't use the chassis or door to carry current or ground. Guess I'll
    be using a grommet and feeding wire through. Not very elegant, but it
    will function. My fear is that the opening and closing of the door
    will wear on the wire and result in a break or short.
     
  9. Greg Neill

    Greg Neill Guest

    Just choose the right wire type. Talk to a wire manufacturer.
    For example: http://www.alphawire.com/pages/flex.cfm
     
  10. Use a spring (A smaller version of a screen door spring.) to keep the
    wire from bending sharply. I have seen this done in industrial
    equipment, and large computer systems to protect the wiring on swing out
    assemblies.

    If you do this, you will extend the life of the wires. You can also
    make it a plug in assembly that is easy to replace, just in case.
     
  11. Tim Auton

    Tim Auton Guest

    For those of us in cold, relatively bug-free places for whom screen
    doors are a bit alien - what does a screen door spring look like?


    Tim
     
  12. About a foot long, and formed so that it retracts to the point the
    turns of the spring touch each other. They look like a threaded rod when
    they are not stretched out by a door.
     
  13. JeffM

    JeffM Guest

    pass 12V current from a chassis to a door
    You're making this much harder than it needs to be.
    It's done all the time by burglar alarm companies.

    To put lead foil on a door,
    there is a cable which bridges the gap at the hindge side.
    For more extreme cases, the cable is a coily-cord.

    To sense closure,
    a reed switch and magnet on the other edge of the door
    (usually on the top side where the fewest people will monkey with it)
    is the most foolproof.
     
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