IMPROVEMENTS IN DRILLING APPARATUS

摘要

The invention provides a drilling apparatus (1) having a base (2) from which a drilling arm is pivotally mounted. The drilling arm (3) has an inner arm (4) and an outer arm (5). The inner arm (4) has a first end (6) and a second end (7). The first end (6) is pivotally connected via a first pivot joint (8) to the base (2). The outer arm (5) has a first end (9) and a second end (10). The second end (7) of the inner arm (4) is pivotally connected via a second pivot joint (11) to the first end (9) of the outer arm (5). At the second end (10) of the outer arm (5) is a drill mounting assembly (12). Actuation of the inner and outer arms (4) and (5) is achieved via drive means in the form of hydraulic cylinders (13). Proper operation of the cylinders (13) causes the second end (10) of the outer arm (5) to follow a substantially linear path.