METHOD AND DEVICE FOR FORMING PERIMETER ZONE OF GUARD SIGNALLING SYSTEM Russian patent published in 1994 - IPC

FIELD: automatic signalling systems. SUBSTANCE: four or more measure sections of microconducting sensitive element and measure residual of sensitive elements are formed in container; the sections have equal lengths. When pulling any measure section out of the container, the sensitive element is turned to 90 deg., that permits to bring into coincidence end and beginning of rolling out of sensitive element more accurately. When winding microconductor the signal loops are formed, where broken conductors are disposed according to number of broken loops. The signal loops are connected with light indicators. Device has plastic case, inside which light source provided with switch is disposed, annunciator and signal processing unit plate. Device also has container, sensitive element made in form of two-wire microconductor, which is reeled onto inertia-free coil. Pair of internal turns of the conductor passes through die and closed together; the die is located at front edge of case of the container. Pair of outputs of external turns of two-wire microconductor of sensitive element is connected to signal processing unit plate through contact plate, disposed between inertia-free coil and signal processing unit plate. Such a construction allows to determine start and end points of rolling microconductor sensitive element more precisely, as well as to exclude break of sensitive element off the plate of signal processing unit after total amount of microconductor is pulled out the container. EFFECT: improved functional reliability. 2 cl, 4 dwg