Attachment attaching/detaching device

Abstract

In an attachment attaching/detaching device 2, a fixed hook 22 that engages a first pin 51 of an attachment 5, and a movable hook 23 that moves toward and away from the fixed hook 22 and engages a second pin 52 of the attachment 5 are provided in an arm connection part 21 to which an arm 12 and a rod or a link 15 are connected. A tilt switch 46 that switches between allowing a flow of current and cutting off a flow of current depending on a tilted posture is mounted to the arm connection part 21 in a state in which the tilt switch 46 is interposed along a shared power supply line 283 to electric driving means for causing the movable hook 23 to advance and retreat. Thus, safety securing means that replaces a locking mechanism is realized.

What is claimed is: 
     
         1 . An attachment attaching/detaching device comprising
 an arm connection part to which an arm and a rod or a link are connected, the arm connection part provided with:   a fixed hook that engages a first pin of an attachment; and   a movable hook that moves toward and away from the fixed hook and engages a second pin of the attachment,   wherein   a tilt switch that switches between allowing a flow of current and cutting off a flow of current depending on a posture is mounted to the arm connection part in a state in which the tilt switch is interposed along a power supply line or a signal line to electric driving means for causing the movable hook to advance or retreat.   
     
     
         2 . The attachment attaching/detaching device according to  claim 1 , wherein:
 the electric driving means is a hydraulic cylinder to which an electromagnetic valve that switches a connection port when a current flows to the power supply line or the signal line is connected.   
     
     
         3 . The attachment attaching/detaching device according to  claim 1 , wherein:
 the tilt switch is mounted to the arm connection part in a tilted posture such that the tilt switch allows the flow of current if the center of gravity of the attachment attached to the attachment attaching/detaching device is located on a side which is further away from the movable hook than a position directly below the center of the fixed hook.   
     
     
         4 . The attachment attaching/detaching device according to  claim 1 , wherein:
 the tilted posture at which the tilt switch is mounted to the arm connection part is freely adjustable.