Apparatus for tamping paving material
AssigneeBlaw-Knox Construction Equipment Corporation
InventorsAdrian Baker, Godfrey G. Little
Life of this patent
Estimating the term…
Abstract
An apparatus that tamps paving material and distributes the paving material evenly across a screed plate before the paving material is leveled by the screed plate. The apparatus includes a tamper bar for compacting material, a drive connected to the tamper bar, and a biasing member. The drive intermittently forces the tamper bar downward into contact with the paving material at a desired speed and to a desired depth. The biasing member is connected to the tamper bar and biases the tamper bar upward against the drive such that the biasing member raises the tamper bar out of contact with the paving surface after the drive forces the tamper bar downward.
Claims11
An apparatus for tamping paving material before the paving material is leveled by a screed plate, the apparatus comprising:
- a tamper bar;
- a rod having a lower end attached to the tamper bar and an upper end;
- a cam drive including a rotatable camshaft and a cam mounted to the camshaft and slidably contactable with the upper end of the rod, the camshaft being configured to rotate the cam such that the cam slides against the rod upper end to drive the tamper bar downward against the paving material;
- and
- a biasing member coupled with the drive rod and configured to bias the rod upwardly against the cam so as to displace the tamper bar upwardly from the paving material.
An apparatus for tamping paving material and distributing the paving material evenly across a screed plate before the paving material is leveled by the screed plate, the apparatus comprising:
- a tamper bar for compacting the paving material;
- a drive connected to the tamper bar for driving the tamper bar downward into contact with the paving material;
- and
- a biasing member connected to the tamper bar for biasing the tamper bar upward against the drive such that the biasing member raises the tamper bar out of contact with the paving surface when the drive is not driving the tamper bar downward.
An apparatus for tamping paving material before the paving material is leveled by a screed plate, the apparatus comprising:
- a tamper bar;
- a drive including a camshaft having a drive shaft and a cam mounted to the drive shaft such that rotation of the camshaft drives the tamper bar, the cam engaging the tamper bar and having a configuration that determines the upward and downward speed of the tamper bar;
- a push rod coupled to the tamper bar and engaged with the drive for transmitting a driving force to the tamper bar from the drive;
- a push rod guide slidingly engaged with the push rod;
- and
- a biasing member engaged with the tamper bar and the push rod guide for biasing the tamper bar upward against the drive.
A tamping apparatus for a screed assembly used with a paving vehicle, the vehicle having a width and the screed assembly including a screed plate for leveling paving material, the apparatus comprising:
- a plurality of tamper bars located forwardly of the screed plate and spaced apart along an axis extending generally across the width of the paving vehicle;
- a drive including a drive shaft and a plurality of cams mounted to the drive shaft, each of the plurality of cams being connected to a corresponding one of the plurality of tamper bars, and having different profiles for driving each of the plurality of tamper bars at different speeds, wherein each of the plurality of tamper bars are driven downward at the same frequency;
- and
- a plurality of biasing members such that each of the biasing members is coupled with a corresponding one of the plurality of tamper bars to bias the plurality of tamper bars upward against the drive.
Dependencies are inferred from the claim text.