Patent ID: 8240400
Filing Date: 2012-08-14
Classification: B25D,E21B

Abstract:
1. A shield structure of a rock drilling apparatus for dampening noise, the rock drilling apparatus comprising a feed beam, with one end that is a drilling end; a rock drill that moves on the feed beam; a drill rod coupled to the rock drill; and a sound-dampening housing surrounding the feed beam, the rock drill, and a part of the drill rod, the shield structure comprising: a first shield part mounted immovably relative to the feed beam in the drilling end of the feed beam at an end of the sound-dampening housing; and a second shield part mounted movably relative to the feed beam in its longitudinal direction, whereby both the first and second shield parts comprise an opening through which the drill rod, which is coupled to the rock drill, moves during the drilling, wherein a flexible tubular shield that is flexible at least in its longitudinal direction is mounted between the openings of the first and the second shield parts, the flexible tubular shield being tightly attached by its ends to the first and the second shield parts in such a way that there is a closed space between the openings of the first and the second shield parts, and wherein the shield structure further comprises,