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| Number | Title | Issue Date |
| 7108459 | Power assisted drill press A power assisted drill press having a feed cylinder fed by a variable pressure regulator which allows a user to controllably feed a bit and work material together while activating a drill motor to rotate the bit. An embodiment of the power assisted drill press utili... | 09/19/2006 |
| 6938702 | Method and equipment for controlling operation of rock drilling apparatus A method and an equipment for controlling the operation of a rock drilling apparatus, which rock drilling apparatus comprises a percussion device for producing impact energy to a tool of the rock drilling apparatus, a rotating device for rotating the tool in a drill... | 09/06/2005 |
| 6209661 | Method and arrangement for controlling feed in rock drilling A method and an arrangement for controlling the feed of a rock drill. In the method, the pressure in a pressure conduit (7a) of a pressure-fluid-operated feed motor (6) is measured, and when the pressure value measured is below the pre-set threshold value... | 04/03/2001 |
| 6112829 | Rock drill air leg control system The invention relates to a rock drill air leg control system incorporated in the backhead (10) of a rock drill. The system comprises a single spool valve (22) having two manual controls (46, 53), one for setting a trust applied by an air leg to a rock dri... | 09/05/2000 |
| 4271914 | Automatic feed and rotational speed control system of a hydraulic motor operated drill A needle valve placed in series with the hydraulic drill feed motor, and responsive to fluid flow in the hydrualic system subject to the operation of a pressure relief valve therein, causes the thrust to increase and the feed rate to decrease as the drill... | 06/09/1981 |
