The main wormwheel and worm reduction. It looks like a single start worm. So the reduction ratio is a direct result of the number of teeth on the wormwheel. Always a difficult task to count teeth from photographs. Made worse by odd numbers of wheel spokes. After repeated counts I make the wormwheel approximately 180 teeth.
One of the two, brass worm shaft bearings is next in line and supports the main worm in contact with the wormwheel. An oiler cap is provided.
The main wormwheel/cam shaft, bearing, bevel gears and secondary wormwheel seen from above. Gent's certainly did not stint on providing adequate strength in the wormwheel casting and other components. Long life and reliability are important when a device is subject to dirt and unskilled care. Even if a covering box was provided it takes only one failure to replace it for typically dirty working conditions to do their worst.
End view of the mechanism from the bell hammer rope pull end. An original length of rope is seen clamped in the linkage on the end of the bell hammer, lifting arm.
Heavy loops of iron or steel help to ensures that no damage occurs if the connection to the bell hammer, lifting lever is broken. This lever is normally held up by the tension of the bell wire or rope.
The motor shaft brake from the rear. A brass disk is fitted to the end of the motor shaft. A fibrous brake pad normally rests against the disk. When the solenoid is activated by low voltage electricity the brake pad is lifted clear of the disk. Allowing free rotation. A strong coil spring pulls the brake on when the solenoid is not powered. The spring pulls below the brake pad, pivot bearings.