| 摘要 |
<p>A coupler (1) for coupling an accessory (5) to an arm of a machine is disclosed. The coupler comprises: a structure (6) having first and second jaws (25, 26); first retention means (21) for locking a first pin (35) of an accessory in said first jaw; second retention means (28), for locking a second pin (36) of the accessory in said second jaw; and actuating means (12, 13, 14) for moving said first retention means between a first position, in which it locks said first pin in said first jaw, and a second position, in which it does not lock said first pin in said first jaw. The arrangement is such that, if said first retention means is in said first position, said second retention means locks said second pin in said second jaw and, if said first retention means is in said second position, said second retention means does not lock said second pin in said second jaw. The coupler also comprises restraining means (22) for restraining movement of said first retention means from said first to said second position in the event of a failure of said actuating means.</p> |
