Automatic boom telescopic motion apparatus for working machine

An automatic boom telescopic motion apparatus for a working machine, comprising:

• a boom including a plurality of boom members, the boom performing telescopic motion by shifting next boom members in front of respective ones with respect to the boom members other than a top boom member;
• a telescopic cylinder configured to allow the boom to perform the telescopic motion;
• a driving source configured to drive the telescopic cylinder;
• an output detection part configured to detect an output of driving force supplied from the driving source;
• a boom telescopic motion input part configured to input a direction of the telescopic motion of the boom and also input an operation to adjust a speed of the telescopic motion of the boom;
• an on/off operation part configured to be able to switch between on and off by a predetermined operation;
• and
• an automatic telescopic motion part configured to continue the telescopic motion of the boom without inputting an operation to perform the telescopic motion of the boom by the boom telescopic motion input part, in a state in which the on/off operation part is turned on, when the output detection part detects an output which is equal to or greater than a predetermined value and an operation is inputted to the boom telescopic motion input part to increase the speed of the telescopic motion of the boom to a value equal to or higher than the predetermined value.