|
(11) | EP 2 573 279 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
|
|
|
|
|||||||||||||||||||||||
| (54) | Hydraulic ram for an excavator coupler |
| (57) A hydraulic ram for an excavator coupler comprising a cylinder having a head end
adapted to be connected to one of the body of the excavator coupler and a latching
hook thereof, a piston slidably mounted in the cylinder between a retracted position
adjacent the head end of the cylinder and an extended position adjacent a distal end
of the cylinder, opposite said head end, said piston dividing the cylinder into a
first working chamber adjacent said head end of the cylinder and a second working
chamber adjacent said distal end of the cylinder, a piston rod extending from the
piston through said second working chamber of the cylinder to extend out of the distal
end of the cylinder, a distal end of the piston rod being adapted to be connected
to the other of the body of the excavator coupler and said latching hook thereof,
a first fluid supply port being provided for supplying pressurised fluid into said
first working chamber to urge the piston and piston rod away from said head end of
the cylinder towards said extended position, wherein a signal port is provided in
the side wall of the cylinder, said signal port being arranged to communicate with
said first working chamber when the piston is in its extended position.
|