Patent ID: 8297888

Claim:
A hydraulic prop for the use in underground mining and tunnel construction, having an exterior pipe ( 15 ) with an end-side foot connection part ( 16 ) as well as a handle ( 17 ) attached to the opposite pipe end, and having an interior pipe ( 19 ) which is designed to be displaceable in the exterior pipe ( 15 ) and has an end-side head plate ( 20 ) and an allocated filling/release valve ( 21 ), pressure-limiting valve ( 22 ) and lock wires ( 30 ) to be slid into connecting grooves ( 36 ) for the exterior pipe ( 15 ), foot connection part ( 16 ) and handle ( 17 ) as well as the interior pipe ( 19 ) and head plate ( 20 ), wherein the lock wires ( 30 , 31 , 32 ) are formed as rectangular wire ties ( 35 ) of spring steel, which are designed to be able to be placed in a connecting groove ( 36 , 37 , 38 ), corresponding in width to the wire ties ( 35 ), and to be able to be displaced from here into a transition region ( 42 ) and thus into an opposite connecting groove ( 39 , 40 , 41 ), corresponding in width to the wire ties, and to connect the pipes together at this location.