초록 ▼

A device for generating and radiating ultrasonic sound waves for the control of pests such as rodents, insects and the like comprising a housing having at least two surface portions, an electrically operated sound generator carried by the housing associated with one of the housing surface portions f

A device for generating and radiating ultrasonic sound waves for the control of pests such as rodents, insects and the like comprising a housing having at least two surface portions, an electrically operated sound generator carried by the housing associated with one of the housing surface portions for providing output sound waves directed outwardly from the one surface portion of the housing and in an ultrasonic frequency range normally inaudible to humans and intolerable by pests such as rodents, insects and the like, and a pair of spaced-apart prongs of electrically conducting material extending from the other of the housing surface portions and connected electrically to the sound generator and adapted for insertion manually into the socket of a standard electrical outlet receptacle commonly found in buildings and the like for supplying electricity to the sound generator and simultaneously supporting and holding the device. The prongs are the sole means for supporting and holding the device relative to the outlet. A stabilizing bar extends from the other housing surface portion at a location spaced from the prongs and is adapted to contact the receptacle in a manner spacing the other surface portion a desired distance from the receptacle. The sound generator comprises a plurality of transducers arranged in two groups operating in two frequency ranges in a manner providing a composite output in the form of a random pattern of frequencies and amplitude peaking in the ultrasonic frequency range.

대표청구항 ▼

Apparatus for generating and radiating ultrasonic sound waves for the control of pests comprising: (a) a housing having at least one end; (b) a plurality of transducers carried by said housing adjacent said one end and arranged in first and second groups for providing sound waves when driven by corr

Apparatus for generating and radiating ultrasonic sound waves for the control of pests comprising: (a) a housing having at least one end; (b) a plurality of transducers carried by said housing adjacent said one end and arranged in first and second groups for providing sound waves when driven by corresponding electrical signals, said sound waves being at frequencies normally inaudible to humans and intolerable by pests such as rodents and insects, each of said transducers having a natural frequency of oscillation, said transducers of said first group operating in a frequency range from about 20 kilohertz to about 35 kilohertz and said transducers of said second group operating in a frequency range above about 50 kilohertz; (c) first driver means operatively connected to said transducers of said first group for applying electrical signals to said transducers to provide said sound waves, said first driver means applying to each of said transducers of said first group an electrical signal having a frequency different from the natural frequency of said transducer to provide a composite output in the form of a random pattern of frequencies and amplitude peaking in the ultrasonic frequency range; (d) second driver means operatively connected to said transducers of said second group for applying electrical signals to said transducers to provide said sound waves, said second driver means applying to each of said transducers of said second group an electrical signal the same as the natural frequency of said transducer; (e) switching means operatively connected to said first and second driver means for causing said first and second groups of transducers to operate one at a time; and (f) means carried by said housing for supplying electrical current to said first and second driver means.