I-lock coupler

Abstract

A quick coupler which features a safety mechanism which facilitates ease of use and assures safe use in the workplace by use of hydraulic circuits designed to automatically reset the safety locking mechanism on intentional removal of a front pin, including use of a 2-line hydraulic supply to the coupler.

1 . A method of engaging an attachment to a coupler body, including the steps of:
 a) engaging a front attachment pin within a coupler cavity of the coupler body, lowering the coupler body to contact a rear attachment pin such that a safety knuckle of the coupler locks over the attachment;   b) extending a primary wedge up the coupler body to lock the rear attachment pin;   c) actuating a lockout switch to build hydraulic pressure.   
     
     
         2 . A method of detaching an attachment from a coupler body, including the steps of:
 a) actuating a lockout switch to build hydraulic pressure;   b) retracting a safety knuckle thereby releasing a front attachment pin, permitting the safety knuckle to reset to a ready position automatically;   c) retracting a primary wedge thereby releasing a rear attachment pin.   
     
     
         3 . A coupler to link an attachment to a motorized vehicle, the coupler including:
 a) a coupler body having a front hook capable of engaging a front attachment pin;   b) a safety knuckle housed within the front hook, the safety knuckle being capable of moving from a non retracted position to a retracted position to permit the front attachment pin to enter the front hook, and then returning to a non retracted position to secure the front attachment pin;   c) a wedge capable of slidingly engaging a rear attachment pin;   d) an actuator and valve set activated by motion of the front attachment pin into the front hook, capable of storing hydraulic energy to assist and release of the safety knuckle.