Patent ID: 7313938

Claim:
Bicycle lock for blocking rotation of the crankshaft of a bicycle, the bicycle lock being provided at the bottom in a saddle tube of the bicycle close to the crankshaft, the bicycle lock comprising a lock housing accommodating a locking pin and a locking mechanism, the locking mechanism being adapted to be operated by a key to be inserted through a hole in the saddle tube, the locking mechanism being adapted to fix the locking pin in either of two positions, wherein the locking pin in an upper position thereof releases the crankshaft and in a lower position thereof blocks the crankshaft, an end of the locking pin in the lower position thereof engaging a matching notch in the crankshaft, the lock housing being coupled to the saddle tube by a rotating coupling, the locking pin in the lower position thereof having a nonrotable engagement with said matching notch, thus blocking rotation of the lock housing and preventing it from being removed from the saddle tube.