Boom limit safety control circuit back-up system

Details Boom limit safety control circuit back-up system Boom limit safety control circuit back-up system

B - Operations, Transporting

66

C

341/97

B66C 23/88 (2006.01) B66C 23/62 (2006.01)

Patent

CA 1201793

- 26 - 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 inhi- bit 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.

382703

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