A quick coupler circuit for attaching and detaching an attachment to a quick coupler includes a coupler cylinder, an actuator, a first hydraulic pump, a boosting valve, a coupler changeover valve, and a changeover switch. The boosting valve switches to a boosting position and the coupler changeover valve switches to a lock-side position when the changeover switch switches to a lock position. When the changeover switch switches to a hold position, the boosting valve switches to a non-boosting position and the coupler changeover valve switches to the lock-side position. When the changeover switch switches to an unlock position, the boosting valve switches to the boosting position and the coupler changeover valve switches to an unlock-side position.

An excavator coupler including a front jaw for receiving a first attachment pin of an accessory and a rear pin receiving area for receiving a second attachment pin of the accessory, a first closure mechanism for the rear pin receiving area, the first closure mechanism including an actuator and a movable second pin engaging surface for selectively securing the second attachment pin in the rear pin receiving area and for pulling the first attachment pin into the front jaw of the coupler, a second closure member for the front jaw for selectively retaining the front attachment pin in the front jaw, and a front latch control component for selectively controlling the second closure member between an open state and a closed state wherein the actuator includes a release member for selectively engaging a release arm on the front latch control component to activate or deactivate the front latch control component.

This invention related to a coupler for securing an attachment to an earth working machine. The coupler comprises a coupler body that presents a receptacle having a capture region. A pin of an attachment can move into and out of the capture region. A retainer can capture the pin in the capture region but the retainer can be moved by a hydraulically driven driver to a position to allow release the pin from the capture region. A trigger that the pin will strike when the pin moves into or out of the capture region, decouples the driver from the retainer and the retainer is then allowed to be biased back to its retaining position by a spring.

An implement attachment adapter, including a centrally located top clevis; two spaced apart lower clevises located below the centrally located top clevis and on opposing sides of a line extending vertically through the top clevis. The two spaced apart lower clevises being are recessed into or behind a first face of a flat plate. The flat plate further includes side tabs located proximate each horizontal peripheral edge thereof extending outwardly away from the first face of the plate. A bottom tab extends outwardly downwardly away from the first face at an obtuse angle relative to the plate. A top bar extends across proximate a top portion of the plate and outwardly away from the first face of the plate and is oriented at an acute angle to the plate. The plate further presents engagement apertures and a second face opposing the first face to which the implement may be coupled.

A quick-change device for changing attachments on a construction machine comprises a main body and parallel lateral flanks with oppositely disposed first and second bearing bushings for receiving mounting pins. To expand the range of applications, at least two oppositely disposed first bearing bushings can be inserted at different angular positions into first oppositely disposed passage openings in the lateral flanks by rotating the bearing bushings about an axis, which is offset relative to a central axis of a receiving hole of the first bearing bushing, and have an external contour for rotationally rigid engagement in a complementary internal contour of the passage opening.

The invention relates to a removable tool assembly for a backhoe digging apparatus of a construction equipment machine having spaced apart parallel first and second fastening pins, said removable tool assembly including an attachment mechanism for releasably attaching said removable tool assembly onto the backhoe digging apparatus, the attachment mechanism including:—a first attachment element having first receiving areas adapted to receive the first fastening pin, and—a second attachment element having second receiving areas adapted to receive the second fastening pin, wherein the second attachment element is movable relative to the first attachment element between a first position, in which the first and second fastening pins can be removed from the first and second receiving areas.

A work tool coupling assembly for a machine with a working implement. The work tool coupling assembly can include an excavator stick and a pin grabber coupler. The pin grabber coupler can include a first plate, a second plate, and a middle plate positioned between the first plate and second plate. The middle plate includes a portion protruding away from the first plate and second plate and is coupled to the excavator stick by a stick pin. The middle plate, the first plate, and the second plate are configured to couple with the working implement.

A coupler including a housing with a top part for attachment to an excavator arm of an excavator, and a bottom part for attachment to an accessory for the excavator, such as an excavator bucket, the bottom part including a front jaw open to a front of the coupler for receiving a first attachment pin of an accessory and a rear pin receiving area for receiving a second attachment pin of the accessory, a latching member for the rear pin receiving area, the latching member including a body, a further jaw extending below the body, a release member extending forward of the body, an attachment point for an end of an actuator and a hole through the body into which a sprung member is located, wherein the sprung member extends through and to under the body and into or partially across a mouth of the further jaw.

The invention relates to a quick-change device (IO) having at least one locking bolt (26) and a motor drive which moves the locking bolt (26) into a locking position and an unlocking position, wherein the drive (16) has an energy connection (28a, 28b) and output means (34) interacting with the locking bolt (26), wherein the drive (16) comprises a rotary drive (30) having a motor and an output shaft (34), wherein the output shaft (34) is mechanically connected to the locking bolt (26), with the result that the locking bolt (26) is movable along an actuation axis. The invention is distinguished by the fact that the drive (16) has an attachment (20) for a shaft-hub connection, on which attachment a tool for manual actuation can be mounted, with the result that a manual actuation acts directly on the output shaft (34) and here the attachment (20) is arranged coaxially to a rotary connection (32a, 32b) of a gear shaft (32c, 32d).

A quick-change device for changing attachments on a construction machine includes a support, first receptacles arranged on one side of the support for receiving a first coupling element, second receptacles arranged on the other side of the support for receiving a second coupling element, and a capturing device arranged on the support for capturing the attachment. In order to avoid damage to the support caused by improper strain on the capturing device, the capturing device has at least one capturing hook pivotably arranged on the support.