Motor bell alarm
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United States of America Patent
Stats
-
Nov 13, 1990
Issued Date -
N/A
app pub date -
Jan 26, 1990
filing date -
Dec 7, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A motor bell alarm comprises an electric motor and a linkage by which the rotational motion generated by an electric motor is translated to a longitudinal oscillating motion so as to cause a plunger coupled to the linkage to cyclically strike a shell, thereby creating a ringing sound. The volume and clarity of the ringing sound are enhanced by minimizing the time in which the plunger is in contact with the shell and by minimizing the rest mass that is in contact with the shell as it is struck by interposing a lost-motion connection between the plunger and the linkage to the electric motor, whereby upon and after striking the shell the plunger is mechanically uncoupled from the lever.
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