Cord switch and pressure sensor

A pressure sensor characterized in that a cord switch is used in which 4n wire electrodes (n represents a positive integer) are spirally arranged along the inner surface of an insulator hollowed in the cross section, which comprises a restorative rubber or plastic material, in the longitudinal direction in a situation where said wire electrodes are not electrically contacted each other, and said wire electrodes are fixed to said hollowed insulator in a state where the wire electrodes are projected from said insulator;

• in one end of said cord switch, a power supply is connected between said two wire electrodes, and a current adjusting resistor is connected between other two said wire electrodes;
• in other end of said cord switch, said wire electrodes are connected each other to form a serial circuit comprising said power supply, said current adjusting resistor and said wire electrodes.