Patent ID: 8098128

Claim:
A system for performing lock control of a working machine, comprising a working machine and a management device which are connected via a communication network so as to be capable of mutual communication, wherein: said working machine comprises: an input means for inputting information; a first communication means which performs mutual communication with said management device via said communication network; and a control means which initiates lock control, where operation of said working machine is restricted, or releases said lock control, based upon either or both of remote actuation by information which has been inputted from said management device via said first communication means and local actuation by information which has been inputted from said input means; and said management device comprises: a second communication means which performs mutual communication with said working machine via said communication network; a lock setting means which transmits a locking signal initiating said lock control, via said second communication means, to said working machine; and a lock release means which transmits an unlocking signal to said working machine for releasing said lock control via said second communication means; and said control means comprises: a first password storage means which stores first password information which is a user password for comparison with information inputted from said input means; a second password storage means which stores second password information which is a one-time password for comparison with information inputted from said input means; and a third password storage means which stores third password information for comparison with information inputted from said management device; and lock setting storage means identifying lock setting information comprising whether said lock control was set by said local actuation or said remote actuation; wherein said working machine is under said lock control, and said control means: releases said lock control, when said lock setting storage means identifies said lock setting information as being set by said local actuation and when said information inputted by local actuation from said input means matches said first password information or said second password information; releases said lock control, when said lock setting storage means identifies said lock setting information as being set by said remote actuation and when said information inputted by said local actuation matches at least either one of said second password information and said third password information; releases said lock control, when said lock setting storage means identifies said lock setting information as being set by said local actuation and when said information inputted by said remote actuation matches said third password information; and prevents release of said lock control by local actuation, when said first password was reset by said remote actuation.