Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1987-06-02
1989-07-18
Chapman, John
Communications: electrical
Condition responsive indicating system
With particular coupling link
340901, 49 14, 180271, G08G 100, H04B 726
Patent
active
048497355
ABSTRACT:
Presented is a radio controlled safety stop system for forklift trucks including a transmitter mounted above a doorway in a warehouse or other building in such a way that a radio signal is continuously transmitted by the transmitter when the door is closed in a pattern such that the signal strength of the radio signal at a predetermined far distance from the door is detectably weaker than the radio signal that is detectable at a predetermined near distance from the door. Mounted on the forklift truck and provided with an appropriate antenna to detect the signals being transmitted, is a radio receiver which detects the radio signal when the forklift truck moves into the far distance zone included by the relatively weak radio signal, and which then functions to activate an alarm to warn the driver that he is approaching a danger zone. If the driver disregards the alarm and proceeds closer to the point of danger, say to the predetermined near distance limit at which the radio signal is more intense, the radio receiver on the forklift truck detects this second level of radio signal strength and responds by disabling the ignition system of the forklift truck.
REFERENCES:
patent: 2025106 (1935-12-01), Hirshfeld
patent: 4013994 (1977-03-01), Ragano et al.
patent: 4115757 (1978-09-01), Blahunka
patent: 4217588 (1980-08-01), Freeny
patent: 4621252 (1986-11-01), Johns et al.
Kirtley James M.
Lamb Kevin S.
Chapman John
Kirtley James M.
Leavitt John J.
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