Patent ID: 9428971
Filing Date: 2016-08-30
CPC Classification: E21B

Claim Text:
1. A rock drilling unit comprising: a feed beam, which is an elongated piece; a rock drilling machine arranged movably on the feed beam and defining a drilling axis, whereby the rock drilling machine includes a shank for connecting a drill rod to the drilling axis; means for moving the drill rod in a transverse direction relative to the drilling axis; at least one retainer device arranged on the feed beam and located on the drilling axis; and at least one clamp having a retaining feature allowing one single drill rod at a time to be retained at a predetermined side position, which is parallel to the drilling axis and is located at a transverse distance from the drilling axis, the clamp including contact surfaces which are pressed against a retained drill rod placed between the contact surfaces, the clamp being spring-actuated, wherein the retaining feature of the clamp is independent of a driving force external to the clamp.