초록 ▼

An elastomer muffler for the exhaust of a pneumatic percussive tool, which comprises an outer and an inner side wall. The cross-sections of the side walls are C-shaped and the side walls are longitudinally unified for forming a cavity therebetween. The muffler is detachably mounted to the tool by re

An elastomer muffler for the exhaust of a pneumatic percussive tool, which comprises an outer and an inner side wall. The cross-sections of the side walls are C-shaped and the side walls are longitudinally unified for forming a cavity therebetween. The muffler is detachably mounted to the tool by resilient snap action. To advantage, the muffler may be used in connection with a pusher leg arrangement for a rock drill. The muffler, then, is mounted on the pusher leg and the inlet mouth thereof is arranged substantially concentrically with the axis of the hinge connection between the pusher leg and the rock drill but spaced axially from said hinge connection. The exhaust port of the rock drill is also substantially concentrically with the hinge connection but spaced axially therefrom.

대표청구항 ▼

In a pusher leg arrangement for rock drills, the combination of a pneumatic rock drill (10) and a pressure fluid operated pusher leg (12) for the supporting and feeding of said rock drill, means (11) for providing a hinge connection between said pusher leg and said rock drill, a muffler housing (56)

In a pusher leg arrangement for rock drills, the combination of a pneumatic rock drill (10) and a pressure fluid operated pusher leg (12) for the supporting and feeding of said rock drill, means (11) for providing a hinge connection between said pusher leg and said rock drill, a muffler housing (56) associated with said pusher leg, an exhaust port (55) in said rock drill through which air under pressure is discharged during operation of said rock drill, and means for fluid tight connecting said muffler housing to said exhaust port, said fluid tight connecting means including an inlet mouth, said inlet mouth being arranged substantially in alignment with said hinge connection but spaced axially therefrom.