Drill soundproofing device

Details Drill soundproofing device Drill soundproofing device

1984-10-19

1986-05-27

Levy, Stuart S.

Boring or penetrating the earth

With tool shaft detail

181230, E21C 700, E21B 1700

Patent

active

045910090

ABSTRACT:
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.

REFERENCES:
patent: 3848931 (1974-11-01), Swisher
patent: 3926265 (1975-12-01), Bouyoucos
patent: 3971447 (1976-07-01), Ahlberg et al.
patent: 4068742 (1978-01-01), Resare
patent: 4108258 (1978-08-01), Ekwall
patent: 4387775 (1983-06-01), Adolfsson
patent: 4393947 (1983-07-01), Lutze et al.
"Noise Control of Jumbo-Mounted Percussive Drills", Erich K. Bender et al., Noise Control Engineering, Nov.-Dec. 1980.

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