US3783590A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter-silencer for pneumatic devices
Assignee: Individual
•
Filing: 1970-07-09
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Granted: 1974-01-08
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Expires: 1990-07-09
Abstract
Abstract A filter-silencer for pneumatic devices such as air valves, cylinders and the like of the type including a porous filter of a sintered metallic mass wherein, upon clogging of the filter and reduction of the air flow through the exhaust port for the corresponding air device, an auxiliary exhaust path is established which precludes the build-up of excessive back pressures in the pneumatic device and which also provides an audible warning signal indicating the need for servicing of the filter-silencer to restore the porous filter to its normal and intended functional state.
Inventors
- 👤 A Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:12
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0084; B01D46/0086; B01D46/24; B01D46/2403; B01D46/42; B01D46/4236; F; F01; F01N; F01N13/00; F01N3/00; F16; F16K; F16K15/00; F16K15/14; F16K15/141; F16K15/142; F16K15/144; F16K15/145; F16K17/00; F16K17/02; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7859; Y10T137/7861; Y10T137/7879; Y10T137/7888; Y10T137/7889
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
256 words
A filter-silencer comprising a body including a passage having an exhaust inlet adapted to be connected to an exhaust flow under pressure and an outlet port, a porous filter connected to said outlet port and constructed and arranged to pass exhaust to atmosphere and to preclude foreign matter from entering said outlet port, means in said body providing at least one auxiliary port to atmosphere for said exhaust flow and valve means on said body normally closing said auxiliary port and operable when the back pressure therein exceeds a predetermined value as a result of the clogging of said filter for opening said auxiliary port to atmosphere to relieve said back pressure, said valve means being constructed and arranged to normally prevent foreign matter from entering into said body through said auxiliary port during the operation thereof, said valve means also being constructed and arranged to return to its normal position in response to relief of said back pressure to reclose said auxiliary port, said body including at least one radial bore intermediate said exhaust inlet and said outlet port and communicating with said passage to provide said auxiliary port, said body being formed with a circumferentially extending annular seat through which said exhaust port opens to atmosphere and said valve means including a circumferentially extending annular valve member normally disposed in said seat and blocking said auxiliary port, said valve member being fabricated of an elastomeric material and deforming when said back pressure exceeds said predetermined value to periodically open and close said auxiliary port.
Claim 2
Dependent Claim
256 words
A filter-silencer comprising a body including a passage having an exhaust inlet adapted to be connected to an exhaust flow under pressure and an outlet port, a porous filter connected to said outlet port and constructed and arranged to pass exhaust to atmosphere and to preclude foreign matter from entering said outlet port, means in said body providing at least one auxiliary port to atmosphere for said exhaust flow and valve means on said body normally closing said auxiliary port and operable when the back pressure therein exceeds a predetermined value as a result of the clogging of said filter for opening said auxiliary port to atmosphere to relieve said back pressure, said valve means being constructed and arranged to normally prevent foreign matter from entering into said body through said auxiliary port during the operation thereof, said valve means also being constructed and arranged to return to its normal position in response to relief of said back pressure to reclose said auxiliary port, said body including at least one radial bore intermediate said exhaust inlet and said outlet port and communicating with said passage to provide said auxiliary port, said body being formed with a circumferentially extending annular seat through which said exhaust port opens to atmosphere and said valve means including a circumferentially extending annular valve member normally disposed in said seat and blocking said auxiliary port, said valve member being fabricated of an elastomeric material and deforming when said back pressure exceeds said predetermined value to periodically open and close said auxiliary port.
Claim 3
Dependent Claim
69 words
A filter-silencer according to claim 1 wherein said valve member circumferentially bears on said valve body at one side of said seat, a major portion of said valve member being free of support and confronting said exhaust port and providing a radially deformable flap section which vibrates in response to exhaust flow through said auxiliary port to provide an audible high pitch warning indicating the clogging of said filter.
Claim 4
Dependent Claim
21 words
A filter-silencer according to claim 2 wherein said filter is a porous sintered metallic mass and said valve member is rubber.
Claim 5
Dependent Claim
257 words
A filter-silencer comprising an elongated body including a longitudinally extending passage having an exhaust inlet adapted to be connected to an exhaust flow under pressure and an outlet port, a porous filter connected to said outlet port and constructed and arranged to pass exhaust to atmosphere and to preclude foreign matter from entering said outlet port, means in said body providing at least one auxiliary port to atmosphere and a flapper valve on said body normally blocking said auxiliary port and operable when the back pressure in said passage exceeds a predetermined value as a result of the clogging of said filter for opening said auxiliary port to atmosphere to relieve said back pressure, said flapper valve being constructed and arranged to normally prevent foreign matter from entering into said body during the operation Thereof, said flapper valve also being constructed and arranged to return to its normal position in response to the relief of said back pressure to reclose said auxiliary port and including a deformable flapper member of an elastomer seated on said body and selectively operable to connect said auxiliary port to atmosphere, a plurality of radially extending auxiliary ports formed in said body, each of said auxiliary ports communicating at its inner end with said passage and opening at its outer end through a circumferentially extending portion being formed with an annular valve seat of a longitudinal extend greater than the corresponding dimension of said auxiliary ports and said flapper member being mounted in said seat straddling and normally blocking said auxiliary ports.
Claim 6
Dependent Claim
257 words
A filter-silencer comprising an elongated body including a longitudinally extending passage having an exhaust inlet adapted to be connected to an exhaust flow under pressure and an outlet port, a porous filter connected to said outlet port and constructed and arranged to pass exhaust to atmosphere and to preclude foreign matter from entering said outlet port, means in said body providing at least one auxiliary port to atmosphere and a flapper valve on said body normally blocking said auxiliary port and operable when the back pressure in said passage exceeds a predetermined value as a result of the clogging of said filter for opening said auxiliary port to atmosphere to relieve said back pressure, said flapper valve being constructed and arranged to normally prevent foreign matter from entering into said body during the operation Thereof, said flapper valve also being constructed and arranged to return to its normal position in response to the relief of said back pressure to reclose said auxiliary port and including a deformable flapper member of an elastomer seated on said body and selectively operable to connect said auxiliary port to atmosphere, a plurality of radially extending auxiliary ports formed in said body, each of said auxiliary ports communicating at its inner end with said passage and opening at its outer end through a circumferentially extending portion being formed with an annular valve seat of a longitudinal extend greater than the corresponding dimension of said auxiliary ports and said flapper member being mounted in said seat straddling and normally blocking said auxiliary ports.
Claim 7
Dependent Claim
63 words
A filter-silencer according to claim 4 wherein said body includes a circumferentially extending mounting shoulder at one side of and within said seat, an end portion of said flapper member bearing against said mounting shoulder and the major part of said flapper member overlying said auxiliary ports and being free of support and vibrating in response to exhaust flow through said exhaust ports.
Claim 8
Dependent Claim
41 words
A filter-silencer according to claim 5 wherein said auxiliary ports are constructed and and arranged to provide a flow characteristic in said passage when in use which is comparable to that for normal operation wherein said porous filter is substantially unclogged.
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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |