Has anyone seen a bike actuated drawbridge? I was just wondering if more creative individuals have ever come up with a bridge that can be actuated from either end by a bike riding onto it. Thanks.
The best I can come up with is two teeters attached with a pulley system.
Yes! We are being ambitious. Unidirectional is easy. Bidirectional is a bit more work. I have a solution but i wanted to probe the community as well. I'll post what i have in mind when i get home. Thanks.
Excellent! Thank you. I'll post mine as soon as I can.
I don't need a draw bridge. It was an idea a friend had. I'm just trying to solve the problem. We figured it would be a cool entrance to a skills section of trail.
All ideas are welcome. Sketches are appreciated. There is no wrong way of doing this. We just want the least amount of moving parts. My idea falls along the lines of what was posted above minus the pulleys.
Here is another one. Attach chainrings to both bridge pivot points. Connect enough chain together to reach around both chainrings and cross them in the middle.
Here's my very rough sketch. This isn't to scale and all that stuff. For simplicity it's drawn as one-way but the same rigging from the opposite direction should allow two-way traffic.
I like the simplicity of Hillybilly Hank's drawing. Just remember to add the appropriate counter weights. I don't see why it wouldn't work bi-directionally though.
I like the simplicity of Hillybilly Hank's drawing. Just remember to add the appropriate counter weights. I don't see why it wouldn't work bi-directionally though.
Counter weights or off center pivot works too. The teeter in my yard is off center but it's easy enough to screw some extra boards on to adjust weight as needed.
It doesn't have to be exactly like a draw bridge. Just similar. With a pylon in the center of the crossing and no pulleys... A criss-cross overlap system could do the trick.
Keep the designs coming. I'll design this in 3d when i get a chance. Thanks all.
Reasons stated above. I want all sorts of crazy stuff I probably won't get approved. The cool thing is that if I don't get approval I will build it in my back yard.
Short answer. Because it's different, ingenious, a good filter for advanced skills sections, etc. And, of course, this trail section would be a branch and not a main line.
Shorter answer, because it's cool. And because I already got a no to build a hamster wheel.
A quick image search found this at Whistler on "A River Runs Through It". This means it's been done and approved by a team of lawyers. That's good news for you.
I have a device that can access the total knowledge of man. I use it to look at pictures of cats and argue with strangers.
A quick image search found this at Whistler on "A River Runs Through It". This means it's been done and approved by a team of lawyers. That's good news for you.
Yeah, but if you have an IMBA Club/Chapter's insurance policy, which doesn't allow teter-totters because they have moving/articulating parts, I don't see how this will be insured either.
Charlottesville Area Mountain Bike Club www.cambc.org
Yeah, but if you have an IMBA Club/Chapter's insurance policy, which doesn't allow teter-totters because they have moving/articulating parts, I don't see how this will be insured either.
No, it wouldn't. It's definitely a teeter. The "Whistler did it" argument might help in other cases but if your insurance forbids it, you're out of luck. I'd never get that approved in any of the public parks I build in. I've never built a municipal skills park but I see things in some of those parks that my parks would never allow.
I have a device that can access the total knowledge of man. I use it to look at pictures of cats and argue with strangers.
when you say "drawbridge" are you simply talking about 2 teeters (that move through whatever angle) that articulate together, or do you mean something that actually opens wide enough to allow some one or something to pass through the space?
Seems to me like a dual-teeter, the second half is really just there to make it intimidating, or ridable in both directions is a different design problem than something that's meant to open up enough for something to pass through.
If you were really building a draw bridge, and the opening was for boats... that would be the coolest thing ever.
This is purely academic. But thank you all for the supportive and negative feedback. The objections are all of great concern. I wouteeters that build anything I don't have approval for. I'm just an enthusiastic builder that cannot, unfortunately, devote time to tOur administrative side if things. Having said that, there is a skills trail in one of our parks. This was state approved. The new master plan has extended it. Therefore, the possibility for new features exists. Currently, two tweeters are there. As a result, the proposal of another set of tweeters that happen to create a bridge might not be such a difficult thing to get approved.
I'd rather design it and have it rejected as a complete idea than have it shot down as a result of poor presentation.
So, for our purposes here, this is an academic endeavor. Thank you all!
Besides, nothing stops me from building in my backyard.
How about this? Two teeter totters connected at the end with a pin/slot mechanism. As one goes down, it pulls the other with it.
They would need to lock together when full down. I'll try to sketch that up when I get a chance later.
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Originally Posted by robbiexor
