The invention discloses a
doorbell, which comprises a shell with perforations on the surface, a motor compartment and a
ringing compartment inside the shell, a motor is fixedly installed in the motor compartment, and a mandrel parallel to the main shaft of the motor is arranged in the
ringing compartment. The two ends of the mandrel are respectively fixed on the two opposite side walls of the ring chamber. The middle of the mandrel is large and the two ends are small. Two torsion springs arranged symmetrically on the mandrel are sleeved on the mandrel, and half of the
torsion spring is fixedly grounded It is tightly sleeved on the larger shaft section in the middle of the mandrel, and the other half is not fixedly connected with the smaller shaft section of the mandrel, and the end of the half
torsion spring is fixedly connected with the rotating plate rotatably sleeved on the mandrel. The side of the plate facing the
motor shaft is connected with a vibrating reed; a pair of connecting rods perpendicular to the main shaft are fixed on the shaft, a spring is installed at the end of the connecting rod, and a
steel ball is fixed at the end of the spring away from the connecting rod. When the motor rotates , the
steel ball can touch the vibrating reed. The
doorbell has reliable structure, low
failure rate, and can effectively avoid excessively long
reverberation.