| 摘要 |
A device for the coupling of an implement (1) to the operating arm of an excavator, comprising an operating arm attachment (25) and a locking member (50) with a hydraulic cylinder (51) and a control unit (41) for supplying the cylinder with an operating pressure, the cylinder having double pistons (57, 58) with piston rods (52, 53) forming locking wedges, wherein the pressure area of the piston is greater on the plus side for locking than on the minus side for opening, said device also comprising an implement attachment with coupling members (4, 5) and locking elements (80, 81) by means of which the implement attachment is coupled to the operation-arm attachment under the influence of the locking member, which operating-arm attachment is provided with two links (26, 27) having counter-supports (39) for cooperation with counter-supports (16, 17) on the implement attachment, the locking member thus exerting pressure on the links in order to press them against the coupling member. According to the invention the cylinder is loosely mounted in openings (93, 94) in the links and stop members are arranged on the cylinder and a link to prevent rotation of the cylinder. Furthermore the control unit also pressurizes the chambers (71, 72) on said plus sides even during locking. The control unit pressurizes the chambers (73, 74) on said minus sides even when the locking wedges are moved from opening to locking position and when the locking wedges assume locking positions. A non-return valve (45) is arranged in the locking connection between the control unit and the chambers (71, 72) on said plus sides, this valve being openable to the emptying of the latter chambers by means of the operating pressure. |
