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US 4,006,783 AGranted
Hydraulic operated rock drilling apparatus
AssigneeLinden-Alimak AB
InventorSven Granholm
Life of this patent
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AssigneeLinden-Alimak AB
InventorSven Granholm
Estimating the term…
A rock drilling apparatus comprises a hydraulically rotated drill, a percussion motor having a piston which transfers impact energy to the drill, the piston defining together with the machine housing first and second pressure chambers for receiving pressure liquid to move the piston, the percussion motor having a hydraulic circuit including a high pressure side and a low pressure side, a pressure liquid distributing valve having a control input for receiving a control pressure, the distributing valve being located in the hydraulic circuit of the percussion motor for alternately connecting at least one of the pressure chambers to the high pressure side and low pressure side, respectively, of the hydraulic circuit in response to the control pressure, the hydraulic circuit for rotating the drill being separate from the hydraulic circuit of the percussion motor and including a high pressure side and a low pressure side separate from the high and low pressure sides of the percussion motor, a control valve for controlling the control pressure in response to the pressure at the high pressure side of said rotary motor.
A rock drilling apparatus, comprising a machine housing, means for mounting a drill in said housing, a hydraulically operated rotary motor for rotating said drill, a percussion motor with an impact piston hydraulically operable to perform a power stroke to and a return stroke from said drill for transferring impact energy thereto, said piston defining together with said machine housing first and second pressure chambers for receiving pressure liquid to move said piston to and from the drill, respectively, said percussion motor having a hydraulic circuit including a high pressure side and a low pressure side, a pressure liquid distributing valve having a control input for receiving a control pressure, said distributing valve being located in said hydraulic circuit of the percussion motor for alternately connecting at least one of said pressure chambers to the high pressure side and low pressure side, respectively, of said hydraulic circuit in response to said control pressure, said rotary motor having a hydraulic circuit separate from said hydraulic circuit of the percussion motor and including a high pressure side and a low pressure side separate from the high and low pressure sides of the percussion motor, and a control valve for controlling said control pressure in response to the pressure at the high pressure side of said rotary motor, the control valve being responsive to the pressures at the high pressure sides of both hydraulic circuits to open and close a control pressure supply line to said control input of said distributing valve for controlling the connection of the high pressure side of the hydraulic circuit of the percussion motor to said first chamber, via said distributing valve.
A rock drilling apparatus, comprising a machine housing, means for mounting a drill in said housing, a hydraulically operated rotary motor for rotating said drill, a percussion motor with an impact piston hydraulically operable to perform a power stroke to and a return from said drill for tranferring impact energy thereto, said piston defining together with said machine housing first and second pressure chambers for receiving pressure liquid to move said piston to and from the drill, respectively, said percussion motor having a hydraulic circuit including a high pressure side and a low pressure side, a pressure liquid distributing valve having a control input for receiving a control pressure, said distributing valve being located in said hydraulic circuit of the percussion motor for alternately connecting at least one of said pressure chambers to the high pressure side and low pressure side, respectively, of said hydraulic circuit in response to said control pressure, said rotary motor having a hydraulic circuit separate from said hydraulic circuit of the percussion motor and including a high pressure side and a low pressure side separate from the high and low pressure sides of the percussion motor, and a control valve for controlling said control pressure in response to the pressure at the high pressure side of said rotary motor, said control valve and said impact piston including means cooperating for controlling the stroke length of the impact piston.
A rock drilling apparatus, comprising a machine housing, means for mounting a drill in said housing, a hydraulically operated rotary motor for rotating said drill, a percussion motor with an impact piston hydraulically operable to perform a power stroke to and a return stroke from said drill for transferring impact energy thereto, said piston defining together with said machine housing first and second pressure chambers for receiving pressure liquid to move said piston to and from the drill, respectively, said percussion motor having a hydraulic circuit including a high pressure side and a low pressure side, a pressure liquid distributing valve having a control input for receiving a control pressure, said distributing valve being located in said hydraulic circuit of said percussion motor for alternately connecting said first pressure chamber to the high pressure side and the low pressure side, respectively, of said hydraulic circuit in response to said control pressure, said rotary motor having a hydraulic circuit separate from said hydraulic circuit of the percussion motor and including a high pressure side and a low pressure side, a control valve for controlling the supply of pressure fluid via said distributing valve to said first pressure chamber in response to the pressures at the high pressure sides of both hydraulic circuits, said impact piston and said machine housing defining valve means connecting said high pressure side of said hydraulic circuit of the percussion motor with said control input in the rearmost position of said impact piston.
Dependencies are inferred from the claim text.