A device forming a coupler including a coupler, or quick-release fastener for attachment to a construction machine, such as a mechanical shovel; a connection device for attachment to a tool, such as a bucket; coupling means to couple the quick-release fastener to the connection device; and locking means to lock the coupling; the connection device including at least one trunnion and preferably two trunnions parallel with one another, the coupler including a base body defining a rear receiving cavity for at least one of the trunnions, characterised in that the coupler includes a lever mounted to pivot between a closed position holding one of the trunnions in the rear receiving cavity and an open position in which it does not hold the trunnion, the locking means being arranged to block or prevent rotation of the lever in the closed position.

Quick-release fastener including a first connection part for attaching to a tool and a second connection part for attaching to an arm of a machine, the first part including a base plate with a front and rear edge, a coupling pin or hook protruding from the lower face of, and a locking hook protruding from the upper face of, the base plate. The second part includes a hook or pin to couple to the coupling pin or hook of the first part, and a slidably mounted locking plate, the locking hook of the first part passing through a through-opening formed in the slidable locking plate of the second part to hook to an edge of the opening once the locking plate has slid to lock the quick-release fastener device. The front edge of the base plate of the first part defines a notch, in particular in a flared shape.

A device forming a coupler including a coupler, or quick-release fastener, and a connection device; the connection device including at least one, preferably two, trunnions, front and back respectively; the coupler including a base body from which, on a front side, at least one hook originates having a region forming a rod and a region forming a hook head extending upwards from the region forming a rod to form, with the base body, at least one receiving cavity for the trunnion or trunnions, having an opening at the top extending between the base body and the region forming the respective head of the respective hook. When the trunnion or trunnions in the receiving cavity comes into contact with the region forming a rod, the region forming a head extends upwards beyond the centre of the circular section of the trunnion.

A device forming a coupler includes a coupler, or quick-release fastener, for attachment to a construction machine, such as a mechanical shovel; a connection device for attachment to a tool, such as a bucket; coupling means to couple the quick-release fastener to the connection device; and locking means to lock the coupling. The connection device includes at least one trunnion and preferably two trunnions parallel with one another, the coupler including a bottom body defining a rear receiving cavity for at least one of the trunnions, characterised in that the coupler includes a lever mounted to pivot between a closed position holding one of the trunnions in the rear receiving cavity and an open position in which it does not hold the trunnion, the locking means being arranged to block or prevent rotation of the lever in the closed position.

Quick-release fastener device for attaching a tool to an arm of a machine including a first part and a second part, the first part including a base plate having front and rear edges, a coupling hook or pin protruding from the lower face of the base plate, and a locking hook protruding from the upper face of the base plate. The second part includes a pin or hook to couple to the coupling hook or pin of the first part; a base plate; and a slidable locking plate, the locking hook of the first part passes through the slidable locking plate to hook to an edge of the opening once the locking plate has slid to lock the device. Two prominences, one right and one left, project from the front of the base plate of the first part.

A device forming a coupler includes a coupler, or quick-release fastener (1) intended to be attached to a construction machine, such as a mechanical shovel, and a connection device (2) intended to be attached to a tool, such as a bucket (3), including at least one coupling trunnion (5), or hook respectively, which is intended to be coupled to at least one associated coupling hook, or trunnion respectively, of the quick-release fastener, and locking means intended to lock the quick-release fastener to the connection device, characterised in that it includes guide means (800, 810) intended to guide the pivoting movement of the quick-release fastener in relation to the connection device after coupling in order to lock the device, in particular self-centring means intended to allow relative self-centring of the quick-release fastener and the connection device.

A system, method, and apparatus for opening a coupler and releasing pressure in a hydraulic circuit comprises an upper brace, a lower brace, a cutout formed in the lower brace, and a plunger release engaged with the upper brace and aligned with the cutout in the lower brace, where the plunger release further comprises a handle, a threaded shaft extending from the handle, and a release socket on an end of the threaded shaft.