Sound reducing means

Details Sound reducing means Sound reducing means

1986-06-30

1987-04-28

Olszewski, Robert P.

Cutting

Processes

83478, 83860, 83701, 30376, 181200, 181205, 144251R, 144252R, B26D 114, B26D 700

Patent

active

046604480

ABSTRACT:
The sound produced by the movement of the teeth of an idling circular saw or band saw blade in air is substantially reduced by exposing the blade to a radiation impedance which is effectively imaginary, thereby subjecting a preselected portion of such sound to propagation cut-off. Propagation cut-off is achieved by providing a cover including a pair of closely spaced parallel acoustically hard-wall plates positionable on both sides of the blade. Preferably the plates are spaced apart by a distance less than 21 millimeters, and extend beyond the tips of the teeth by a distance several times the space between the plates. Portions of the plates may be moveable to expose the teeth during the cutting operation.

REFERENCES:
patent: 3692335 (1972-09-01), Vickers et al.
patent: 3899043 (1975-08-01), Hall

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