Expert: William J Perkins - 3/4/2008

Question
I am restoring a large Cuckoo clock make by Fritz Haertel.  The movement looks similar to others I've seen on the internet: 3 levers on the lower left.  1 is clearly for the hammer that strikes the gong or spring. The clock has 2
bellows. Do the remaining 2 levers operate the 2 bellows, independently? If so, what makes the bird open his mouth and raise his wings when exiting the clock?  It appears that the builder used a bird with articulating wings and beak, but never hooked them up to articulate? I would appreciate any help.  Bob

Answer
You have it right with respect to the lift levers.  As to the birds action, there is a whip wire that causes the birds tail to lift, it is the lifting of the tail that causes the mouth to open.  To get a complete understanding of cuckoo clock functioning try to get a copy of Karl Kochmann's book, "The Black Forest Cuckoo Clock"
This book is a virtual manual on cuckoo clocks and is an essential component of any cuckoo clock lover's library.  Many public libraries have this book available through their networks.  It is also a frequent seller on ebay.  I urge that you take a look see at this book.  Incidentally replacement birds, with flapping wings, are still available.  Let me know how you come out with this.  Regards WJP