HauntWorld Home - Forums Home - Live Chat - Find Haunted Houses - Hauntworld Magazine - Haunted House Supplies - America's Best Haunts - Find Vendors
Haunted House News - Haunted Tradeshows - Join Hauntworld Facebook - Hauntworld Twitter - Advertise - Contact Us

Thread: Knocker

Results 1 to 6 of 6
  1. Default Knocker 
    Join Date
    Feb 2012
    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  
    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.

  3. Default  
    Join Date
    Jan 2012
    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  
    Join Date
    Dec 2010
    Frederick, Maryland
    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

    ~The Imagineer~

    Andrew de Ruiter

    Download part 1 of Andrew's Black Book of ideas for haunts here:

  5. Default  
    Join Date
    May 2009
    HauntYourHouse.net/House of Shadows/Sparta Wisconsin
    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
    Owner- Haunt Your House llc

  6. Default  
    Join Date
    Feb 2009
    Brilliant Ohio
    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


Thread Information
Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts