F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
255/35
F15B 11/20 (2006.01) E21B 15/04 (2006.01)
Patent
CA 1103233
ABSTRACT OF THE DISCLOSURE A drill boom arrangement has hydraulic parallel motion means for positioning an elongated rock drilling apparatus to different drilling positions with respect to the boom support. A boom is pivoted at its rear end on a first universal joint for lateral and vertical swinging by first and second hydraulic cylinder means pivotally connected between the boom and support. A boom head carrying the elongated rock drilling apparatus is pivoted at the forward end of the boom on a second universal joint for lateral and vertical swinging. Third and fourth hydraulic cylinder means swing the boom head and rock drilling apparatus. The boom support carries the first hydraulic cylinder means for swinging about a third universal joint arranged on one side of the vertical swinging plane of the boom. The third hydraulic cylinder is pivotally connected to the boom head for swinging about a fourth universal joint arranged on the other side of the vertical swinging plane of the boom. A hydraulic circuit including conduits connecting the first and third hydraulic cylinder means for hydraulic slave coupling thereof to maintain substantially parallel displacement of the rock drilling apparatus during positioning.
325225
Kimber Erich V.
Lundstrom Axel L.
Atlas Copco Aktiebolag
Fetherstonhaugh & Co.
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