US3789954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air motor noise suppressor
Assignee: Graco Inc
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Filing: 1973-06-19
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Granted: 1974-02-05
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Expires: 1993-06-19
Abstract
Abstract Self-contained apparatus is described for reducing the acoustic and mechanical noise associated with an air-operated motor, wherein noise signals are contained within a sealed enclosure surrounding the air motor and channeled over a complex path including noise filters to the atmosphere.
Inventors
- 👤 W Raleigh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:19
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/08; F01N1/10; F01B; F01B31/00; F01B31/005; F01N2450/00; F01N2450/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
100 words
Apparatus for suppressing air motor noise caused by mechanical contact of said air motor moving parts and by air exhaust blasts emitted from said motor exhaust ports, comprising: a first enclosure surrounding said motor exhaust ports and having a plurality of exhaust holes for releasing said air exhaust blasts; a base portion sealably attached to anD covering the bottom of said air motor; a second enclosure surrounding said first enclosure and detachably connected to said base portion, said second enclosure having an outlet hole; and an open-ended muffler duct attached to said second enclosure in alignment with said outlet hole.
Claim 2
Dependent Claim
100 words
Apparatus for suppressing air motor noise caused by mechanical contact of said air motor moving parts and by air exhaust blasts emitted from said motor exhaust ports, comprising: a first enclosure surrounding said motor exhaust ports and having a plurality of exhaust holes for releasing said air exhaust blasts; a base portion sealably attached to anD covering the bottom of said air motor; a second enclosure surrounding said first enclosure and detachably connected to said base portion, said second enclosure having an outlet hole; and an open-ended muffler duct attached to said second enclosure in alignment with said outlet hole.
Claim 3
Dependent Claim
22 words
Apparatus as claimed in claim 1, further comprising a layer of resilient foam material covering the surface area within said muffler duct.
Claim 4
Dependent Claim
29 words
Apparatus as claimed in claim 2, wherein said open-ended muffler duct further comprises a baffle plate internal said second enclosure and a deflector plate external of said second enclosure.
Claim 5
Dependent Claim
21 words
Apparatus as claimed in claim 3 wherein said base portion further comprises a sealing collar surrounding said air motor drive shaft.
Claim 6
Dependent Claim
22 words
Apparatus as claimed in claim 4, further comprising a layer of sound-deadening mastic material over the inner surface of said second enclosure.
Claim 7
Dependent Claim
30 words
Apparatus as claimed in claim 5 wherein the cross-sectional area of said muffler duct open end is 10-100 times the cross-sectional area of said first enclosure plurality of exhaust holes.
Claim 8
Dependent Claim
79 words
In an air driven motor assembly having exhaust air emitted during each stroke of the motor, the improvement comprising: a. an enclosure surrounding the entire air motor assembly and having sealable connections for the air inlet supply and motor drive shaft; b. an air outlet in said enclosure; and c. a baffle and deflector plate attached to said enclosure and aligned with said air outlet to form an elongated air duct in communication with said enclosure interior and exterior.
Claim 9
Dependent Claim
79 words
In an air driven motor assembly having exhaust air emitted during each stroke of the motor, the improvement comprising: a. an enclosure surrounding the entire air motor assembly and having sealable connections for the air inlet supply and motor drive shaft; b. an air outlet in said enclosure; and c. a baffle and deflector plate attached to said enclosure and aligned with said air outlet to form an elongated air duct in communication with said enclosure interior and exterior.
Claim 10
Dependent Claim
25 words
Apparatus as claimed in claim 7 further comprising a layer of resilient foam material over a substantial portion of said elongated air duct interior surface.
Claim 11
Dependent Claim
23 words
Apparatus as claimed in claim 8 further comprising a surface of sound-deadening mastic material over substantially the entire inner surface of said enclosure.
Claim 12
Dependent Claim
25 words
Apparatus as claimed in claim 9 wherein said elongated air duct is partially external to said enclosure and has a downwardly extending external open end.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |