Shock Absorbers on B&M's Chain Dog Ratchet?

Thursday, July 7, 2005 1:09 PM
I was riding Chang last night after I got off work(two train operation last night?!?!?!?...while T2 only had one train??????). Anyways, I was in the front row and going up the lift I was looking at the chain dog ratchet. Then I took a closer look and it appeared that they weren't even attached to the track at all. Then every 20 feet or so, the ratchet section ended and a new one began, where it looked like a small shock absorber (actually it looked like about 4 inches thick of rubber) connected it to the track. I don't understand why B&M would want the ratchet to move a little bit and why it would have a shock absorber. Can anyone explain this to me, and also, does every B&M have this, or just stand-ups, or older beamers?
Thursday, July 7, 2005 3:59 PM
Was the train making the clickity-clack noise? If not, perhaps to retract them? Cut down on noise?
Thursday, July 7, 2005 4:31 PM
No, I don't think it prevents the clickity-click noise. I think it's if the chain breaks and the chain dogs are used, some of the train's momentum of going backwards will go into those absorbers. Only one problem with this: the train won't move that far backwards, if at all.
Thursday, July 7, 2005 4:54 PM
What you are describing is the Anti-Rollback Rack. It is installed in sections with rubber shock absorbers. Keep in mind that B&M trains weigh at least 20,000 pounds. When the train stops on the lift during block checks or due to a ride fault, the shock absorbers soften the impact to the ride structure.
Friday, July 8, 2005 3:51 PM
The chain dog is the ratchet on the train that grabs on to the chain. If you're going up a lift hill where the chain dog isn't being used you'd better hope the anti-rollbacks are working or there's only one train on the track.
Friday, July 8, 2005 4:34 PM
Chain dog/anti-rollback, Michael/John...what's the difference?? ;)

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