Driving force of a bending motor is transmitted to a sprocket via a clutch mechanism portion. The operation of a switching operation lever switches the clutch mechanism portion to a disconnecting/restoring status. A bending control device includes a bending angle calculating portion which calculates...http://www.google.se/patents/US20040054258?utm_source=gb-gplus-sharePatent US20040054258 - Electric bending endoscope apparatus
