![]() We have found that many manufacturing plants and warehouses utilize vast square footage areas to perform their various functions, and that delivery of supplies and the shipping of materials from these plants is frequently by truck or railroad car. 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. 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. 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. for limiting or indicating lifting force for fork-lift trucks DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD B66F- HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g.Application granted granted Critical Publication of US4849735A publication Critical patent/US4849735A/en Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by KIRTLEY JAMES M 839 COLUMBIA AVENUE SALINAS CALIFORNIA 93901 filed Critical KIRTLEY JAMES M 839 COLUMBIA AVENUE SALINAS CALIFORNIA 93901 Priority to US07/057,380 priority Critical patent/US4849735A/en Assigned to KIRTLEY, JAMES M., 839 COLUMBIA AVENUE, SALINAS, CALIFORNIA 93901 reassignment KIRTLEY, JAMES M., 839 COLUMBIA AVENUE, SALINAS, CALIFORNIA 93901 ASSIGNMENT OF ASSIGNORS INTEREST. Original Assignee KIRTLEY JAMES M 839 COLUMBIA AVENUE SALINAS CALIFORNIA 93901 Priority date (The priority date is an assumption and is not a legal conclusion. ![]() KIRTLEY JAMES M 839 COLUMBIA AVENUE SALINAS CALIFORNIA 93901 Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Lamb Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US07/057,380 Inventor James M. Google Patents Radio controlled safety stop system for forklift trucksÄownload PDF Info Publication number US4849735A US4849735A US07/057,380 US5738087A US4849735A US 4849735 A US4849735 A US 4849735A US 5738087 A US5738087 A US 5738087A US 4849735 A US4849735 A US 4849735A Authority US United States Prior art keywords signal radio forklift truck mhz truck Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US4849735A - Radio controlled safety stop system for forklift trucks US4849735A - Radio controlled safety stop system for forklift trucks
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