US3845840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silencer and lubricant trap for air tool exhaust
Assignee: MASTER PNEUMATIC DETROIT
•
Filing: 1973-06-04
•
Granted: 1974-11-05
•
Expires: 1993-06-04
Abstract
Abstract A combined baffle and air turbulator-lubricant interceptor gap is mounted within the upper part of a cup defining an expansion chamber and subjacent lubricant sump. The baffle directs exhaust air from a pneumatic tool into circumferential, lubricantdepositing impingement against the wall of the expansion chamber. The turbulator-interceptor gap prevents lubricant from being propelled along interior surfaces to the outlet. Engaged-base double cones of porous sintered metal in the outlet muffle the sound of the outgoing air by breaking up its flow into myriad paths.
Inventors
- 👤 G Thrasher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:09
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/30; F01N1/00; F01N1/08; F01N1/10; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
241 words
A silencer and lubricant trap for air exhausting from pneumatically powered tools which comprises, means forming a body having an inlet adapted to receive air exhausted from a pneumatic tool, said body defining an expansion chamber having a wall, a passageway between said inlet and chamber, a lubricant sump below said chamber, and an outlet downstream of said chamber, baffle means in said passageway effective to direct air flowing therethrough into lubricant-depositing impingement against the expansion chamber wall, muffler means effective to muffle the sound of air passing through said outlet, there being surface portions within said body along which air flows toward said outlet, and at least one gap between certain of said surface portions surrounding the path of said air flow, said gap being so dimensioned and positioned as to intercept lubricant propelled toward said outlet along those of said surface portions upstream of said gap, said baffle means comrising a circumferentially arranged series of alternate webs and passages dimensioned and positioned to so divert air flowing through said passages, said baffle means, said certain surface portions, and said gap comprising elements of an assembly, said webs and passages being disposed around the periphery of said assembly, said assembly having a partition which inter-connects said webs, forms inner surfaces of said passages, and forms an outer side of said gap, said assembly having a skirt which is spaced from said partition and forms the inner side of said gap.
Claim 2
Dependent Claim
241 words
A silencer and lubricant trap for air exhausting from pneumatically powered tools which comprises, means forming a body having an inlet adapted to receive air exhausted from a pneumatic tool, said body defining an expansion chamber having a wall, a passageway between said inlet and chamber, a lubricant sump below said chamber, and an outlet downstream of said chamber, baffle means in said passageway effective to direct air flowing therethrough into lubricant-depositing impingement against the expansion chamber wall, muffler means effective to muffle the sound of air passing through said outlet, there being surface portions within said body along which air flows toward said outlet, and at least one gap between certain of said surface portions surrounding the path of said air flow, said gap being so dimensioned and positioned as to intercept lubricant propelled toward said outlet along those of said surface portions upstream of said gap, said baffle means comrising a circumferentially arranged series of alternate webs and passages dimensioned and positioned to so divert air flowing through said passages, said baffle means, said certain surface portions, and said gap comprising elements of an assembly, said webs and passages being disposed around the periphery of said assembly, said assembly having a partition which inter-connects said webs, forms inner surfaces of said passages, and forms an outer side of said gap, said assembly having a skirt which is spaced from said partition and forms the inner side of said gap.
Claim 3
Dependent Claim
26 words
The structure defined in claim 1 wherein said passages have a length in the direction of air flow therethrough which is greater than their cross dimension.
Claim 4
Dependent Claim
26 words
The structure defined in claim 2 wherein said passages have helical form and are oriented to effect centrifugal impingement of said air against said chamber wall.
Claim 5
Dependent Claim
18 words
The structure defined in claim 3 wherein said passages have substantially uniform effective sectional area throughout their lengths.
Claim 6
Dependent Claim
31 words
The structure defined in claim 1 wherein said partition and skirt terminate in a downward direction substantially at a common horizontal plane and have bottom surfaces comprising said certain surface portions.
Claim 7
Dependent Claim
28 words
The structure defined in claim 5 wherein said webs comprise vanes engaged against portions of a wall defining said passageway and forming outer peripheral portions of said passages.
Claim 8
Dependent Claim
66 words
The structure defined in claim 6 wherein said body comprises a head and a cup, said head having said inlet and an upstream part of said passageway, said cup being secured to said head and defining a downstream part of said passageway, said chamber and lubricant sump, said vanes having flanges secured against tHe top of said cup by interengaged means on said head and assembly.
Claim 9
Dependent Claim
37 words
The structure defined in claim 7 wherein said assembly is annular and has a tubular extension of said skirt extending downstream therefrom, said interengaged means including the downstream end of said extension and means on said head.
Claim 10
Dependent Claim
36 words
The structure defined in claim 8 wherein said muffler means comprises at least one porous, sintered metal member having a peripheral portion contained between said downstream end of said extension and said means on said head.
Claim 11
Dependent Claim
38 words
The structure defined in claim 9 wherein there are a pair of said members having generally conical shape with interengaged flanged bases, the flanges of which are so contained between said downstream end and means on said head.
Claim 12
Dependent Claim
45 words
The structure defined in claim 10 wherein a generally conical portion of one of said members projects through said extension into said expansion chamber, and a generally conical portion of the other of said members projects away from the outlet and exteriorly of said head.
Claim 13
Dependent Claim
28 words
The structure defined in claim 8 wherein said assembly comprises a body of plastic material, said elements and tubular extension being integrally formed in said body of material.
Claim 14
Dependent Claim
185 words
A silencer and lubricant trap for air exhausting from pneumatically powered tools which comprises, means forming a body having an inlet adapted to receive air exhausted from a pneumatic tool, said body defining an expansion chamber having a wall, a passageway between said inlet and chamber, a lubricant sump below said chamber, and an outlet downstream of said chamber, baffle means in said passageway effective to direct air flowing therethrough into lubricant-depositing impingement against the expansion chamber wall, there being surface portions within said body along which air flows toward said outlet, and at least one gap between certain of said surface portions surrounding the path of said air flow, said gap being so dimensioned and positioned as to intercept lubricant propelled toward said outlet along those of said surface portions upstream of said gap, said baffle means, said certain surface portions, and said gap comprising elements of an assembly, said outlet being open to atmosphere, muffler means effective to muffle the sound of air passing through said outlet to atmosphere, said body and assembly having support means which secure said muffler within said outlet.
Claim 15
Dependent Claim
185 words
A silencer and lubricant trap for air exhausting from pneumatically powered tools which comprises, means forming a body having an inlet adapted to receive air exhausted from a pneumatic tool, said body defining an expansion chamber having a wall, a passageway between said inlet and chamber, a lubricant sump below said chamber, and an outlet downstream of said chamber, baffle means in said passageway effective to direct air flowing therethrough into lubricant-depositing impingement against the expansion chamber wall, there being surface portions within said body along which air flows toward said outlet, and at least one gap between certain of said surface portions surrounding the path of said air flow, said gap being so dimensioned and positioned as to intercept lubricant propelled toward said outlet along those of said surface portions upstream of said gap, said baffle means, said certain surface portions, and said gap comprising elements of an assembly, said outlet being open to atmosphere, muffler means effective to muffle the sound of air passing through said outlet to atmosphere, said body and assembly having support means which secure said muffler within said outlet.
Claim 16
Dependent Claim
32 words
The structure defined in claim 13 wherein said muffle has a portion which projects into said expansion chamber and a portion which projects beyond said outlet to the exterior of said body.
Claim 17
Dependent Claim
19 words
The structure defined in claim 14 wherein said muffler is formed of a porous sintered metal and is hollow.
Claim 18
Dependent Claim
38 words
The structure defined in claim 15 wherein each of said muffler portions has the form of a truncated cone with a base, the bases of the cones having interengaged flanges, said flanges being engaged by said support means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |