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Constrained Layer Damper and Noise Suppressor for Rock Drill Steel.

Authors
Jensen-JW; Visnapuu-A
Source
U S Pat 3 842 942 1974 Oct; :
Link
NIOSHTIC No.
10011998
Abstract
A constrained layer damper and noise suppressor is made an integral part of a rock drill steel shaft. Rearward of the drill bit a viscoelastic layer constituting a damping medium is bonded around the drill steel for a major portion of its length. Coextensive with the outer diameter of this medium a smooth thin-walled, rigid, abrasion-resistant tube is bonded. Usually the diameter of the constraint tube is less than the major diameter of the drill bit so the entire invention can penetrate a drilled hole.
Publication Date
19741001
Document Type
PA;
Fiscal Year
1975
NTIS Accession No.
NTIS Price
Identifying No.
PAT 3,842,942
NIOSH Division
RORC;
Source Name
U.S. Pat. 3,842,942, Oct. 22, 1974, Chem. Abstr. Not Found
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