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(11) | EP 1 956 165 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | A post driver |
| (57) A post driver (1) has a support frame (2) with means (3) for attachment to a carrier
vehicle. A mast (4) is mounted on the support frame (2). A hammer (5) is slidably
mounted on the mast (4) for movement between raised and lowered positions on the mast
(4). A hammer actuating assembly (8) is operable for raising the hammer (5) on the
mast (4) for release to drive a post. The hammer actuating assembly (8) has a hammer
lifting rope (10) having a first end (11) attached to the hammer (5) and a second
end (20) attached to the mast (4), said rope (10) extending outwardly from the hammer
(5) and around a fixed pulley (15) which is rotatably mounted on the mast (4) and
then downwardly and around a movable pulley (18) and then upwardly to an anchor point
(19) on the mast (4) to which the second end (20) of the rope (10) is attached. Drive
means (26) is operable for moving the movable pulley (18) away from the fixed pulley
(15) for raising the hammer (5). The movable pulley (18) is rotatably mounted on a
carriage (25), said carriage (25) slidably engaging the mast (4). The drive means
(26) is a ram connected between the carriage (25) and a ram mount (29) on the mast
(4) below the carriage (25).
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