| 摘要 |
<p>Fall-back prevention press of a crane in the form of a gas pressure cylinder, with a piston rod engaging in a cylinder space of the gas pressure cylinder configured as piston-type accumulator, with gas in the bottom space of the cylinder being in exchange with the gas in the piston rod and the ring space in surrounding relationship to the piston rod. A seal arrangement in a rod guide of the cylinder seals the piston rod against the cylinder. The seal arrangement includes a lubricant groove which extends around the rod guide and via which the piston rod is lubricated on the outside. The lubricant is acted upon by gas pressure prevailing in the cylinder with interposition of a pressure transmitter.</p> |
