Locking mechanism for fixing gas spring for e.g. car hatch in extended position, has casing and tensioning device extending around piston rod and capable of expanding rod when subjected to a load

摘要

The casing and tensioning device extend around the piston rod in the spring and when they are subjected to a load they expand the rod elastically. The dimensions of the tensioning device are chosen so that it can withstand a limited overload, above which the casing disengages from the piston. The spring comprises a cylindrical piston and an extendable piston rod normally secured to a door frame and door wing respectively. The casing extends around at least part of the rod and is secured to the outer end of the latter. The casing is engaged with the piston in a first position so that the rod is prevented from being inserted into the piston and in a second position it is disengaged from the piston. An elastically resilient tensioning device acts upon the casing as it moves from the first position to the second.