| 摘要 |
A quick coupler for coupling an attachment, such as a digging bucket to a machine such as an excavator. The quick coupler includes a first fixed jaw 5 for a first coupling pin of the attachment. The quick coupler also includes a latch that cooperates with the first fixed jaw and which is moveable to a latched position for retaining the first coupling pin. A moveable jaw is provided that is able to slide, under power of a hydraulic ram, to a closed position in which it retains the second coupling pin. A locking arm is arranged 10 to assume a locked position in which it prevents withdrawal of the moveable jaw from the closed position. The latch is fast with the locking arm and assumes the latched position upon the locking arm assuming the locked position. Consequently, even in the event of a hydraulic failure the locking arm member simultaneously locks both the first attachment coupling pin, by 15 means of the latch, and the second attachment coupling pin by means of it preventing movement of the movable jaw from the closed position. A second fixed jaw is also provided which opposes the movable jaw and which acts to retain the second attachment coupling pin in the event of a failure of the movable jaw to thereby prevent potentially dangerous swinging of the 20 attachment. |
