Exhaust means for pneumatic power tool

Details Exhaust means for pneumatic power tool Exhaust means for pneumatic power tool

1990-01-05

1991-06-11

Echols, P. W.

Tool driving or impacting

Drive control operable by hand engaging manipulating handle

173DIG2, 181230, 181255, 181256, B23B 4500

Patent

active

050224697

ABSTRACT:
A sound depressing exhaust means for a pneumatic power tool with a substantially cylindrical housing (10) and a vane motor (11) with exhaust port means (23), has an annular casing (41) surrounding a portion of the housing (10), and four expansion chambers (31-32, 34, 36, 39) arranged in series and combined with four flow restrictions (33, 37, 30, 35) and a sound trap (38). All of the expansion chambers are annular and located concentrically relative to the tool housing (10), and one of the flow restrictions has an annular screen (37) separating two of these chambers (34, 36). The last two of the expansion chambers (36, 39) in the exhaust flow direction contain high frequency absorbing elements (43, 44) of foamed plastic.

REFERENCES:
patent: 4407390 (1983-10-01), LeBlanc, Jr.
patent: 4673042 (1987-06-01), Steiner
patent: 4739837 (1988-04-01), Maslakov et al.
patent: 4778015 (1988-10-01), Jacobsson

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