Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1993-06-25
1996-04-09
Groody, James J.
Communications: electrical
Condition responsive indicating system
With particular system function
340539, 340584, 340689, G08B 1900
Patent
active
055065651
ABSTRACT:
A device (10) for signaling the felling of a tree (50) includes a transmitter, an inclination switch (14) which is positioned or mounted within the trunk (52) of the tree (50), the inclination switch (14) being responsive to detect inclination such that the inclination switch (14) is off when the trunk (52) is in an upright position and the switch (14) is on when the trunk (52) has been felled and a fire alarm switch (15) which is responsive to detect a threshold temperature such that the fire alarm switch (15) is off when the environment's temperature is lower than the threshold and the fire alarm switch (15) is on when the threshold temperature is exceeded. The transmitter is connected to the inclination switch (14) and the fire alarm switch (15) and is energized to transmit a signal to a remote location when either or both of the switches is on. The device (10) may be part of a system which includes a plurality of like devices (10) each of which are installed into different trees (50). The trees (50) into which the devices (10) are to be installed may be strategically selected in a pattern among trees to protect the entire forest. In order to determine which device (10) is transmitting a signal, two receivers (60, 62) and triangulation techniques are employed.
REFERENCES:
patent: 4521120 (1985-06-01), Blank et al.
patent: 4958145 (1990-09-01), Morris
patent: 5045839 (1991-09-01), Ellis et al.
patent: 5089808 (1992-02-01), Amirdash
patent: 5168264 (1992-12-01), Agustin
Andrew de Leon Joseph
Petersen Brian W.
Groody James J.
Miller John W.
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