Seismic intrusion detector system Patent #: 3984803
ApplicationNo. 06/045783 filed on 06/05/1979
US Classes:367/116, Audible or tactile135/76, Separable handle135/911, CANE FOR THE BLIND342/24, BLIND AID367/910PORTABLE SONAR DEVICES
ExaminersPrimary: Farley, Richard A.
Attorney, Agent or Firm
International ClassesG01S 15/00 (20060101)
G01S 15/88 (20060101)
G01S 15/18 (20060101)
AbstractA conventional mobility cane for the blind incorporates a compact, dual-mode, ultrasonic obstacle detection sensor that includes a combination transmitting and receiving, capacitance type electrostatic transducer. The size of the protective zone associated with said sensor is infinitely variable. In one mode, the sensor warns of low lying objects that might contact the upper extremities of an ambulatory mobility cane user. In another mode, the user can determine the presence or absence of more remote objects. Means are provided for readily alternating between said object sensor modes.