Abstract: A coupler (24) for coupling an accessory (28) to an excavator arm (12) of an excavator (10), the coupler comprising a first jaw (30) that points in a generally longitudinal direction relative to the frame of the coupler (24), the jaw (30) being for receiving a first attachment pin of an accessory (28) and having a first sensor (40) for detecting the presence of an attachment pin therein, the coupler (24) further having a second jaw (32), or a latch (34), longitudinally spaced from the first jaw (30), and being for receiving a second attachment pin of the accessory (28), and having a second sensor (42) for detecting the presence of an attachment pin therein. The sensors (40, 42) transmit or send signals to a receiver (46, 48) for notifying the driver of the coupling status of the coupler (24) with respect to the accessory (28).

Abstract: A coupler (11) for connecting a dipper arm (3) of an excavator to a bucket (1) without need for the operator of the excavator to leave the cab of the excavator, the coupler (11) having a device for connecting it to the end of the dipper arm (3), and a latching hook (17) for connecting it to a bucket (1), wherein the latching hook (17) has a special internal profile (56, 57, 61) so that when it is supporting the weight of a bucket (1), it will tend to move to a latching position, not to an unlatching position.

Abstract: A coupler (11) for connecting a dipper arm (3) of an excavator to a bucket (1) without the need for the operator of the excavator to leave the cab of the excavator, the coupler (11) having means for connecting it to the end of the dipper arm, and means, including a latching hook (17) for connecting it to one of a plurality of different buckets (1) and wherein locking means (25) is provided to prevent inadvertent unlatching of the latching hook (17), said locking means (25) being operable from the cab. The locking means may be gravity operated and include resiliently deformable means (27), thereon to prevent unlatching when the coupler (11) is inverted. Alternatively, it may be spring (71) operated in which case, further means (73, 75) is provided to move the locking means against the bias of the spring. Preferably, the hook (17) has a special internal profile (56, 57, 61) so that when it is supporting the weight of a bucket, it will tend to move to a latching position, not to an unlatching position.