On this day in 1909 Hiram Phelps Arms was granted the patent for Alarm Clock. U.S. Patent No. 924,127.
The object of the invention is to provide a simple and cheap alarm clock which may be placed beneath the pillow of a bed occupied by a person that is hard of hearing and which will effectively awaken such a person without disturbing others in the apartment. This object is attained by constructing a clock which can be set to let off the alarm at the desired hour, with a percussion board and a hammer which, when the alarm is freed, will produce a concussive effect sufficient to awaken the deaf sleeper, and with a shield which so covers the clock and the hammer as to deaden the sound waves and protect the mechanism from interference and disarrangement by the pillow and clothing of the bed or its occupant.
