Depth control for asphalt pavement milling machine
First Claim
1. An asphalt pavement milling machine having a frame adapted for movement along a line of machine travel, rotary milling means rotatably carried on the frame for milling engagement with the pavement, and depth-of-cut control means for locating the frame at a precise distance above the pavement to be milled so as to locate the rotary milling means relative to the pavement to provide a precise depth of cut, the depth-of-cut control means including depth control shoe means adapted to slide over the pavement, slide means connected to the shoe and carried for vertical sliding motion on the frame, rocker arms means pivotally connected to the slide means and to the main frame, and fluid power cylinder means having a cylinder body and a rod partially extensible from and retractable into the cylinder body, the cylinder means being pivoted to the main frame and to the rocker arm, cylinder rod movement relative to the cylinder body thus operating to rock the rocker arm means, slide the slide means, and raise and lower the shoe means relative to the frame.
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Abstract
An asphalt pavement milling machine is disclosed which includes mechanism for precisely controlling the depth of cut made by a rotating milling head carried on a machine frame. The depth-of-cut control apparatus includes a shoe adapted to slide over the pavement, and fluid power cylinder means which urge the shoe toward and away from the head-carrying frame through a rocker arm and a vertical slide. A similar device can be mounted upon an opposite side of the machine frame. A fluid power system interconnects the operating cylinders to level the frame and provide smooth, stress-free operation.
28 Citations
20 Claims
- 1. An asphalt pavement milling machine having a frame adapted for movement along a line of machine travel, rotary milling means rotatably carried on the frame for milling engagement with the pavement, and depth-of-cut control means for locating the frame at a precise distance above the pavement to be milled so as to locate the rotary milling means relative to the pavement to provide a precise depth of cut, the depth-of-cut control means including depth control shoe means adapted to slide over the pavement, slide means connected to the shoe and carried for vertical sliding motion on the frame, rocker arms means pivotally connected to the slide means and to the main frame, and fluid power cylinder means having a cylinder body and a rod partially extensible from and retractable into the cylinder body, the cylinder means being pivoted to the main frame and to the rocker arm, cylinder rod movement relative to the cylinder body thus operating to rock the rocker arm means, slide the slide means, and raise and lower the shoe means relative to the frame.
- 13. An asphalt pavement milling machine having a bi-sided frame adapted for movement along a line of machine travel, rotary milling means rotatably carried on the frame and located between the frame sides for milling engagement with the pavement, and depth control means mounted on each frame side for locating the frame at a precise distance above the pavement to be milled, each depth control means including a depth control shoe adapted to engage and slide over the pavement, extensible fluid power cylinder means functionally interposed between the frame and the associated depth control shoe to raise and lower the frame and said milling means relative to that shoe, and a fluid power circuit means including a source of pressurized fluid and conduit means connecting each fluid power cylinder to the source of pressurized fluid and connecting each fluid power cylinder to every other fluid power cylinder in a parallel connection arrangement whereby to level said frame relative to the pavement over which the frame is traveling.
Specification