Power shovel having hydraulically driven dipper actuator
First Claim
Patent Images
1. A hydraulic system for a power shovel, comprising:
- a tank;
a pump configured to draw fluid from the tank and pressurize the fluid;
a crowd cylinder extendable and retractable to adjust a length of a dipper handle;
a valve in fluid communication with the tank, the pump, and the crowd cylinder, the valve movable to fill chambers of the crowd cylinder with fluid pressurized by the pump and to drain the chambers of the crowd cylinder to cause extension and retraction of the crowd cylinder;
a dipper actuator located at an end of the crowd cylinder; and
a passage extending through the crowd cylinder to communicate with the dipper actuator.
1 Assignment
0 Petitions
Accused Products
Abstract
A hydraulic system for a power shovel may have a tank, a pump configured to draw fluid from the tank and pressurize the fluid, a crowd cylinder extendable and retractable to adjust a length of a dipper handle, and a valve in fluid communication with the tank, the pump, and the crowd cylinder. The valve may be movable to fill chambers of the crowd cylinder with fluid pressurized by the pump and to drain the chambers of the crowd cylinder to cause extension and retraction of the crowd cylinder. The hydraulic system may also have a dipper actuator located at an end of the crowd cylinder, and a passage extending through the crowd cylinder to communicate with the dipper actuator.
-
Citations
20 Claims
-
1. A hydraulic system for a power shovel, comprising:
-
a tank; a pump configured to draw fluid from the tank and pressurize the fluid; a crowd cylinder extendable and retractable to adjust a length of a dipper handle; a valve in fluid communication with the tank, the pump, and the crowd cylinder, the valve movable to fill chambers of the crowd cylinder with fluid pressurized by the pump and to drain the chambers of the crowd cylinder to cause extension and retraction of the crowd cylinder; a dipper actuator located at an end of the crowd cylinder; and a passage extending through the crowd cylinder to communicate with the dipper actuator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A method of operating a power shovel, comprising:
-
pressurizing fluid; directing pressurized fluid to chambers of a crowd cylinder and draining fluid from the chambers of the crowd cylinder to cause the crowd cylinder to adjust a length of a dipper handle; and directing pressurized fluid through the crowd cylinder to a dipper actuator located at an end of the crowd cylinder. - View Dependent Claims (16, 17, 18, 19)
-
-
20. A power shovel, comprising:
-
a body; a boom pivotally connected at a base end to the body; a dipper handle pivotally connected at a base end to a midpoint of the boom; a crowd cylinder disposed within the dipper handle and being configured to extend and retract to change a length of the dipper handle; a dipper pivotally connected to a distal end of the dipper handle; a dipper actuator associated with the dipper and configured to selectively release a door of the dipper; a passage extending through the crowd cylinder to the dipper actuator; at least one accumulator located between the passage and the dipper actuator; and a dipper control valve fluidly connected between the at least one accumulator and the dipper actuator.
-
Specification