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Thread: Knocker

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  1. Default Knocker 
    #1
    Join Date
    Feb 2012
    Posts
    8
    I am needing to know where I can get something that will knock on the underside of a bridge when triggered by a motion detector. Can anyone help me out with this?
     

  2. Default  
    #2
    well this isn't exactly a knocker, but years ago we put cheap palm sanders to the underside of our bridge. strapped the corners with "plumbing strap" so they were tight to the bottom. 2 of them worked for a 12ft bridge, we also used a power drill with a piece of "flatbar" welded to a bolt ,chucked inside to slap a door to make it "slam" open & closed..you might could use that same type setup to work.
    Slaughter
    www.theslaughterhousehorror.com
     

  3. Default  
    #3
    Join Date
    Jan 2012
    Location
    ohio
    Posts
    29
    i have used a air chisel on piece of metal wow is it load but you do need a actor. Also a chair massager motor both work great this dont have a sound effect but the vibration is really cool in the dark makes people think the are getting shocked
     

  4. Default  
    #4
    Join Date
    Dec 2010
    Location
    Frederick, Maryland
    Posts
    195
    This is an idea I used for another prop that you might consider. Although it's not a knocker, it makes a rattle that is loud.

    I built this out of 2x4s and mounted it under an empty wooden barrel. It made a lot of noise.

    Its an octagon shaped ring. Inside there are metal bearings welded to spring-loaded thick metal wires. There are four of them in the picture but I think that's overkill, the thing made a ton of noise. Plus, if you remove three of the balls this will give you a nice vibration too. The only bad part is you will need to replace the boards. They wear down fast.

    Each wire is attached to a motor shaft underneath the octagon plate. The plate is just a cut plywood sheet. This worked great for barrels, so maybe you can use it under your bridge.

    2013-06-09 07.44.43.jpg
    RIP

    ~The Imagineer~

    Andrew de Ruiter

    Download part 1 of Andrew's Black Book of ideas for haunts here:
    http://www.epubbud.com/book.php?g=EGQDK8HZ
     

  5. Default  
    #5
    Join Date
    May 2009
    Location
    HauntYourHouse.net/House of Shadows/Sparta Wisconsin
    Posts
    217
    One of my buddies at our haunt is a fire alarm tech. He came up with a couple fire alarm bell hammers (I believe are 24volt). You can find these online. I believe I posted this a while back. But the bell hammer simply strikes a steel plate (instead of the bell). He just mounted the electric hammer and the strike plate under the bridge. Extremely simple, virtually fail proof, and was LOUD and rattled the h-e-l-l out of the bridge he had it under!

    Just another idea depending on what you have access to!
    Kelly Anderson
    House of Shadows Sparta Wisconsin
    http://www.house-of-shadows.org/
    Owner-Haunt Your House.net
    http://www.hauntyourhouse.net
     

  6. Default  
    #6
    Join Date
    Feb 2009
    Location
    Brilliant Ohio
    Posts
    336
    Give a call to fright props and tell them what you wanna do, I'm sure they'll tell you what you need. They have all that stuff
    Like a midget at a urinal, you gotta be on your toes

    http://www.wellstownshiphauntedhouse.com
     

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