EP 0066891 A3 19840118 - NOISE DAMPING MEANS FOR DRILLING RODS
Title (en)
NOISE DAMPING MEANS FOR DRILLING RODS
Publication
Application
Priority
- DE 3122968 A 19810610
- DE 3133286 A 19810822
Abstract (en)
[origin: EP0066891A2] 1. Arrangement for sound quieting to be applied in the operation of percussive drills particularly in underground mining and tunnel construction, in that the resistance of the drilling rod which has any of the known polygonal, round or elliptic cross-sections, and which is provided for being inserted between drill hammer and drill bit, is increased thus inhibiting the generation of natural acoustic oscillations by means of additional masses that are attached to the drilling rod and permanently fixed thereto, characterized in that a sleeve-like metallic compound (3) consisting of two individual masses (4, 5) separated by a simply slipped-on sleeve-like spacer (6) made of rubber, synthetic material or a metal piece of pipe with internal rubber or plastic coating, is attached to the drilling rod directly before the shank (2) of the drilling rod (1) to be inserted into the drill hammer ; this is done in a permanent way - for example by means of pressing on, possibly after previous insertion of rubber of synthetic rings between drilling rod (1) and individual masses (4, 5), in order to improve non-skidding properties - whereby the - preferably identical - individual masses (4, 5) themselves as well as the mass compound (3) as a whole are dimensioned such that they are short in relation to the overall length of the drilling rod (1), but do represent a sensible additional mass in relation to the mass of the drilling rod (1).
IPC 1-7
IPC 8 full level
B25D 17/11 (2006.01); E21B 17/00 (2006.01)
CPC (source: EP)
B25D 17/11 (2013.01); E21B 17/00 (2013.01); E21B 17/006 (2013.01)
Citation (search report)
- [XD] DE 2920139 A1 19801120 - RUHRKOHLE AG
- [Y] FR 1452240 A 19660225 - MONTABERT ETS
- [Y] BE 507310 A
- [A] DE 2454784 B2 19761125
- [A] FR 2442110 A1 19800620 - WACKER WERKE KG [DE]
- [A] DE 2602021 A1 19770728 - RUHRKOHLE AG
- [A] US 3926265 A 19751216 - BOUYOUCOS JOHN V
- [A] US 3819168 A 19740625 - NITTINGER R, et al
- [E] GLüCKAUF, Band 118, Nr. 23, Dezember 1982, Seiten 1181-1183, Bochum, DE., B. Baerendorf: 'Stand der Laermminderung im Steinkohlenbergbau an der Ruhr'
Designated contracting state (EPC)
DE FR GB SE
DOCDB simple family (publication)
EP 0066891 A2 19821215; EP 0066891 A3 19840118; EP 0066891 B1 19860312; DE 3269795 D1 19860417
DOCDB simple family (application)
EP 82105048 A 19820609; DE 3269795 T 19820609