Working Principle
Electric current flows through the coil when the switch is ON, and the iron core acts
as an electromagnet. The
iron core attracts the hammer towards it. The hammer hits
the bell and produces a sound. The
circuit breaks at the screw contact when the hammer moves towards the iron core. At this point, the iron
core ceases to be an electromagnet. The hammer
is pulled back to its original position due to the spring action of the steel rod, and then touches the contact again to
complete the circuit. The circuit is completed and current flows through the coil again,
and the hammer strikes the bell
Assembly Instructions
Take base board. Fix 4 foam pieces at 4 corners of the board from bottom side after removing release
paper from tape attached
to each piece. Fix 3 'L' shaped brackets
to board using bolts & nuts.
Insert a long bolt into the rightmost
hole from bottom side of board. Fix
it firmly with board using a nut
from top side. Insert one more nut in
the bolt and bring it approximately
to the centre of the bolt.
Hold the electromagnet horizontally with two electrical terminals on top. Insert 'U' shaped metal bracket over the threaded portion of iron core. Pass remaining threaded portion of iron core through the top hole of L shaped bracket on the board and fix it tightly using a nut.
Take a bolt. Pass it through
top hole of the leftmost 'L'
bracket from front side. Insert
hammer over the threaded portion of bolt keeping copper plate in the
front. Keep
hammer perfectly horizontal to board and then fix it tightly to bracket using a nut.
the end of the hammer can strike the bell dome from side. Put-in one more nut from top of the bolt to fix the dome in place. Keep small gap between dome and round part of hammer so that hammer can vibrate freely. This gap can be increased or decreased by rotating the dome
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