Title:
SOUND-PROOF CASING FOR PNEUMATICALLY OPERATED ROCK DRILLING MACHINE
Document Type and Number:
Japanese Patent JPS60173288
Kind Code:
A
Abstract:
The internal absorbent layer (9) of the casing delimits an internal volume (10) around the drill (1), which volume is divided on either side of the exhaust orifice (3) by two transverse partitions (13A, 13B) into three successive expansion chambers (11A, 11B, 11C) between the exhaust orifice (3) and the outlet opening (12) to the air outside the casing.
Inventors:
FUREDERITSUKU ETEINU MARUSERU
FURANSOWAAZU JIAN MARII MOOMU
FURANSOWAAZU JIAN MARII MOOMU
Application Number:
JP23424184A
Publication Date:
September 06, 1985
Filing Date:
November 08, 1984
Export Citation:
Assignee:
CHARBONNAGES DE FRANCE
International Classes:
B25D17/00; B25D17/11; B25D17/12; E21B1/00; E21B1/30; F02B77/13; (IPC1-7): B25D17/12; E21C3/24
Attorney, Agent or Firm:
Ezaki Mitsuyoshi