Abstract: An attachment control system includes an electrical control system and hydraulic control system. The electrical control system interfaces with the hydraulic control system to ensure that attachment decoupling in response to operator electrical control can occur only when at least one hydraulic threshold condition is satisfied as indicated by a hydraulic pressure sensor. Attachment decoupling is prevented unless the pressure sensor outputs an electrical signal that indicates that the attachment is safely positioned (e.g., full-extend or full-curl). In one example, this is indicated with the attachment positioning cylinder is pressurized above a select threshold as indicated by a pressure sensor.

Abstract: An arm assembly for an excavator includes an arm comprising a first hook including a first open mouth. The arm further includes a first pin capturing system that selectively obstructs the first open mouth. A link is movable relative to said arm and comprises a second hook including a second open mouth. The second open mouth is oriented toward the arm, and the link further comprises a second pin capturing system that selectively obstructs the second open mouth. The first and second pin assemblies of an attachment are selectively captured in the first and second hooks. The pin assemblies include a sleeve rotatably positioned on an attachment pin that extends between ribs of the attachment. The sleeve includes a bore that closely receives the attachment pin and the length of the sleeve is selected so that the sleeve fits closely between the attachment ribs, thereby allowing the arm assembly to pick-up various attachments with different pin diameters, ribs spacings and pin-to-pin distances.

Abstract: A coupler includes a first hook assembly comprising a first hook adapted to receive a first associated attachment pin and a second hook assembly comprising a second hook adapted to receive a second associated attachment pin. The second hook assembly selectively pivots under force of an actuator relative to the first hook assembly by an actuator. The actuator comprises a screw jack that includes a locking sleeve to prevent unintended rotation of the screw member. Alternatively, the coupler includes a locking cam that moves between a retracted position and an extended position and a supplemental lock that selectively prevents movement of the locking cam from the extended position to the retracted position, and the actuator is operatively coupled to the second hook assembly and the locking cam.

Abstract: A pusher for snow or other material includes a blade including a front surface for moving material and an opposite rear surface, and upper and lower edges. A wiper is secured to the lower edge of the blade. Left and right sidewalls are connected to opposite sides of the blade. The sidewalls are each arranged transverse to the blade and define chain-engaging apertures. Left and right skid-shoe assemblies are connected respectively to the left and right sidewalls and slidably support the blade above a surface to be cleared. A plurality of cross-supports are connected to the rear surface of the blade and extending between the left and right sidewalls. A coupler structure is connected to the rear face of the pusher and defines a pick-up location adapted to be engaged by an associated pusher-moving machine for operative connection of the blade to the pusher-moving machine.

Abstract: An improved lift mechanism that is portable and towable, and has a telescopic and angularly adjustable load carrying boom, four telescopic support legs with pivotable wheels thereon, and a low center of gravity frame of a two part construction pivotally connected together and having a tilt indicator warning thereon.