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  • Knocker

    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
    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

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    • #3
      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

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      • #4
        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

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        • #5
          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
          Owner- Halloween Undercroft
          http://www.halloweenundercroft.com/
          Owner- Haunt Your House llc

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          • #6
            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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