Quick coupler

摘要

A quick coupler for coupling a tool like for example a scoop, shell grab or demolition tongs to a tool guide such as an excavator arm or the like, including a coupling receptacle for receiving a first locking part and a locking receptacle for receiving a second locking part, wherein to the coupling receptacle a self-locking securing element is associated for catching and/or securing the first locking part in the coupling receptacle, and to the locking receptacle a pressure-medium-actuatable locking element is associated for locking the second locking part in the locking receptacle. The self-locking securing element of the coupling receptacle likewise is actuatable by the pressure circuit.

主权项

1. A quick coupler comprising:
a coupling receptacle for receiving a first locking part, the coupling receptacle having a self-locking securing element for one or both of catching or securing the first locking part in the coupling receptacle; a locking receptacle for receiving a second locking part, the locking receptacle having a pressure-medium-actuatable locking element for locking the second locking part in the locking receptacle; a pressure circuit actuating both the self-locking securing element and the pressure-medium-actuatable locking element, the pressure circuit having:
an unlocking pressure port;a locking pressure port;a valve means selectively connectable with one of a pressure source or a return line; anda pressure control means; wherein the self-locking securing element is connected with the unlocking pressure port via a first switching valve that opens upon reaching and subsequently exceeding a first pressure; and wherein the pressure control means selectively controls the pressure applied at the unlocking pressure port to a second pressure greater than the first pressure and to a third pressure less than the first pressure.