| 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.
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