Quick coupler with front pin safety lock system

Abstract

Quick coupler with front pin safety lock system including body, front pin lock configured to rotate pivotally to lock in a pin, slide ratchet configured to move forward-backward to force the front pin lock to rotate, actuator including a cylinder and a piston rod which moves in the cylinder, rear lock connected to the piston rod, links configured to connect the rear lock and the slide ratchet and casing configured to house a part of the links and a part of the slide ratchet, is provided. It can work even when power is cut off and emergency front pin release can be performed.

1 . A quick coupler apparatus comprising,
 a body;   a front pin lock configured to rotate pivotally to lock in a pin;   a slide ratchet configured to move forward-backward to force the front pin lock to rotate;   an actuator comprising a cylinder and a piston rod which moves in the cylinder;   a rear lock connected to the piston rod;   a plurality of links configured to connect the rear lock and the slide ratchet; and   a casing configured to house a part of the links and a part of the slide ratchet.   
     
     
         2 . The quick coupler apparatus of  claim 1 , further comprising, a pivotal rod protruded from the casing. 
     
     
         3 . The quick coupler apparatus of  claim 2 , wherein
 the links comprising a first link, a second link and a third link and   the first link and the second link are movably joined by first link joint, and   the second link and the third link are movably joined by second link joint.   
     
     
         4 . The quick coupler apparatus of  claim 3 , further comprising,
 a protruded pin configured on the surface of the rear lock; and   a rear lock stroke hole configured within the first link.   
     
     
         5 . The quick coupler apparatus of  claim 3 , wherein
 the second link is connected with the pivotal rod by a rod pin.   
     
     
         6 . The quick coupler apparatus of  claim 3 , wherein
 length ratio from the first link joint to pivotal rod and from the pivotal rod to the second link joint is 1:n, wherein, n>0 and wherein n is real number.   
     
     
         7 . The quick coupler apparatus of  claim 1 , further comprising,
 a first spring configured to connect the front pin lock and the body;   a second spring placed inside of the casing.   
     
     
         8 . The quick coupler apparatus of  claim 1  any one of the claims above, further comprising,
 an emergency release handler for releasing a front pin quickly. 
 
     
     
         9 . A quick coupler apparatus comprising,
 a body;   a pivot pin attached to the body;   a locking arm pivotally attached to the pivot rod;   an actuator comprising a cylinder and a piston rod which moves in the cylinder;   a rear wedge attached to the piston rod; and   a locking guide attached to the rear wedge.   
     
     
         10 . The quick coupler apparatus of  claim 9 , the locking guide further comprising,
 a release wedge for moving the locking arm into a released status when inserted underneath the locking arm, and   a locking stopper for maintaining the locking arm to a locked status when positioned above the locking arm.   
     
     
         11 . The quick coupler apparatus of  claim 10 , wherein the locking guide is U-shaped. 
     
     
         12 . The quick coupler apparatus of  claim 9 , the quick coupler further comprising,
 a release wedge is configured to be connected to the locking guide.