Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1984-05-04
1987-03-03
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
212154, 340686, 34087038, B66C 1506, G08B 2100
Patent
active
RE0323667
ABSTRACT:
A safety circuit for a lifting device extensible boom is presented wherein the boom angle of elevation and boom length are each converted into a parallel coded word. The two coded words, one representing boom angle and the other boom length, are processed in a digital logic network which provides inhibit functions that prevent boom extension or boom lowering when either of the two boom actions will place the boom in a position which will damage the boom or topple the machine. A plurality of switches are associated with the boom to generate and apply the boom length code word to a monitoring circuit, which responds thereto to provide a switch malfunction signal when one of the switches is defective, whereby boom extension or lowering are inhibited.
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JLG Industries Inc.
Lavine Irvin A.
Mullen Jr. Thomas J.
Rowland James L.
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