Percussion tool with noise reducing characteristics and method o

Details Percussion tool with noise reducing characteristics and method o Percussion tool with noise reducing characteristics and method o

1975-06-23

1977-06-21

Purser, Ernest R.

Tool driving or impacting

Processes

173162, 173DIG2, 181 33A, 181 36A, B25D 1712, B25D 1724

Patent

active

040305538

ABSTRACT:
A method of modifying a percussion tool to provide noise reduction, and a percussion tool having effective noise damping characteristics.
In the method of the present invention, a troublesome noise frequency radiated by the tool is identified, and a resonant bending mode shape for the tool is determined, which bending mode shape corresponds to the identified noise frequency. The tool is then assembled and a structural discontinuity is introduced at a point along the length of the tool which is a predetermined axial distance from a selected antinode of the bending mode shape to provide an impedance mismatch at that point.
The tool, which is of predetermined length, is formed of one or more sections, each of which is of a selected length. The lengths of the sections are carefully determined such that when the tool is in assembled condition, impedance mismatches are provided at selected points along the length of the tool, to provide noise reduction of several troublesome noise frequencies.

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patent: 2161062 (1939-06-01), Killgore
patent: 2680333 (1954-06-01), Calosi
patent: 2989130 (1961-06-01), Mathewson, Jr. et al.
patent: 3027953 (1962-04-01), Coski
patent: 3094176 (1963-06-01), Cook
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patent: 3263446 (1966-08-01), Wiggins, Jr.
patent: 3344874 (1967-10-01), Bodine
patent: 3815691 (1974-06-01), Richter
patent: 3856107 (1974-12-01), Rabett

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