EP 0141728 B1 19891220 - DEVICE FOR SOUND ATTENUATION OF DRILLS
Title (en)
DEVICE FOR SOUND ATTENUATION OF DRILLS
Publication
Application
Priority
FR 8316879 A 19831024
Abstract (en)
[origin: ES282200U] A soundproofing device for a drill which has an elongate shaft extending between a bit and a forged collar for attaching it to a pneumatic hammer comprises a sheath formed by a semi-rigid tube of plastics material adapted to surround the shaft without touching it. This sheath extends between sealed first mounting ring near the bit and second mounting ring near the hammer. These mounting ring are free to move relative to the shaft in rotation and in translation. Tests show a reduction in the noise level 5 m from the drill from 102 dBA to 89 dBA.
IPC 1-7
IPC 8 full level
B25D 17/11 (2006.01); E21B 1/38 (2006.01); E21B 17/00 (2006.01); E21B 19/24 (2006.01)
CPC (source: EP US)
B25D 17/11 (2013.01 - EP US); E21B 17/006 (2013.01 - EP US)
Citation (examination)
NOISE CONTROL ENGINEERING, volume 15, no. 3, Novembre - Décembre 1980
Designated contracting state (EPC)
AT BE CH DE GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0141728 A2 19850515; EP 0141728 A3 19850619; EP 0141728 B1 19891220; AT E48783 T1 19900115; AU 3427984 A 19850502; AU 567589 B2 19871126; CA 1235074 A 19880412; DE 3480772 D1 19900125; ES 282200 U 19850401; ES 282200 Y 19851101; FR 2553697 A1 19850426; FR 2553697 B1 19860314; JP S60133193 A 19850716; US 4591009 A 19860527; ZA 848261 B 19850626
DOCDB simple family (application)
EP 84402129 A 19841023; AT 84402129 T 19841023; AU 3427984 A 19841016; CA 466122 A 19841023; DE 3480772 T 19841023; ES 282200 U 19841023; FR 8316879 A 19831024; JP 22138284 A 19841023; US 66262984 A 19841019; ZA 848261 A 19841023