Atlas Copco Aktiebolag

Bo Erik Forsberg

Carl G Ekwall

Kurt H Andersson

Sven Ingemar Johansson

A rock drill is mounted on a cradle that is axially displaceably mounted on a feed beam. The drill has a front aperture for receiving the rear end of a drill string. The drill string is freely insertable into and retractable out of a rotation transmitting wear bushing in the aperture, and a drill string retainer is mounted on the cradle. The wear bushing is also freely retractable out of the drill, and it is also held in position by the drill string retainer. The rear end of the drill is mounted to the cradle by means of a hinge connection so that the front end of the drill can be swung up when the wear bushing is to be replaced.

Rock drilling apparatus

A recoil damping device for a percussive tool comprises a retard piston which is movable in a cushioning chamber. The feeding force and/or the pressure in the supply passage to the cushioning chamber is regulated so that the retard piston is axially free relative to the machine housing.

Method and device for damping the recoil of a work tool connected to a

An impact motor has a reciprocating piston that has its piston rod guided in bushings in the housing. The bushings are lubricated by oil-loaded compressed air but the piston is forced to reciprocate by oil-free compressed air.

Growing community of inventors

Tyreso, Sweden

Bo Erik Forsberg