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US 4,092,903 AGranted
Vibratory drive mechanism
AssigneeGraystone Corporation
InventorFranz Allmer
Life of this patent
Estimating the term…
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AssigneeGraystone Corporation
InventorFranz Allmer
Estimating the term…
Opposed pivotally mounted tamper arms are oscillated by respective single-acting hyraulic piston assemblies controlled by separate hydraulic duplex rotary distributing valves. Fluid supply and return lines for each piston assembly are connected to a source of pressurized hydraulic fluid via the respective rotary valve. Each valve has a stationary ported shell which receives a rotary cylindrical spool having a pair of axially displaced supply and return throughports which alternately register with supply and return line ports in the shell to open and close the connections between the respective piston assembly and the supply and return lines. While the rotary valves are preferably driven by a common drive unit, the relative phase of the oscillations of the arms can be determined by rotationally offsetting one of the spools with respect to the other by the desired phase angle.
A vibratory drive mechanism for an oscillating tool, comprising:
A tandem vibratory drive mechanism for a pair of cooperatively oscillating tools, comprising:
Dependencies are inferred from the claim text.