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US 4,074,737 AGranted
Wood planer cutterhead design for reduced noise level
OwnerJohn S. Stewartinventor
Life of this patent
Estimating the term…
Abstract
A helical cutterhead for a wood planer for reducing noise level during planing by supressing vibration and sound radiation by having more than one knife blade engaged in the workpiece at any instant by satisfying the minimum condition of the formula L=.pi.D cot.phi./N is less than the workpiece width and in which L is the contact distance, D is the cutterhead diameter, N is the number of knife blades, and .phi. is the helix angle, and in which L is less than 4 inches.
Claims9
A wood planer cutterhead for reducing noise level comprising:
- a rotatable shaft, a cylindrical cutterhead mounted on said shaft, a series of helically mounted cutting blades mounted on said cutterhead, said cutting blades being spaced circumferentially on said cutterhead and positioned to simultaneously engage a surface to be cut to reduct noise level, the spacing between said cutting blades being in accordance with the formula L=.pi.Dcot.phi./N in which L is the linear distance between adjacent helical cutting blades, D is the cutterhead diameter, N is the number of cutting blades and .phi. is the helix angle, and the ratio of W/L, in which W is the width of the workpiece, is greater than 1.
Dependencies are inferred from the claim text.