US4838908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine air intake screen assembly
Assignee: Kohler Co
•
Filing: 1988-07-27
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Granted: 1989-06-13
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Expires: 2008-07-27
Abstract
Abstract An engine intake screen assembly as provided. A rotatable screen (22) has a continuous peripheral skirt (26) which telescopes with an upstanding housing ring-like flange (12) so as to create a serpentine entry path for grass and other foreign matter trying to enter at the seam between the screen (22) and the inlet (37). Entry can be further restricted through the use of a radially outwardly directed ring extension (28) on the screen (22) and/or a guard ring member (29). These parts can combine to form a trap pocket (39) and/or to increase the serpentine nature of the entry path. In one version, the grass will form its own seal (44) in the trap (39).
Inventors
- 👤 Mark S. Bader
- 👤 Robert L. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:52
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/16; F01; F01P; F01P11/00; F01P11/12; F02B63/00; F02B63/02; F02B75/007; F02M; F02M35/00; F02M35/02; F02M35/04; F02M35/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
167 words
In an engine intake screen assembly of the type having: (a) a shaft that rotates when the engine is running; (b) a screen and a fan, both adapted to be operatively connected to and rotated by the shaft; (c) a fan housing around the fan having a housing wall with an air intake port formed therein, the upstream side of said wall being formed with an upstream directed substantially continuous annular flange that surrounds the intake port; and (d) the screen being positioned upstream of the intake port and flange; the improvement comprising: the screen having a downstream directed substantially continuous peripheral skirt positioned radially outward of said annular flange so as to require foreign matter seeking to enter the air intake port by traveling outside the screen peripheral edge to follow a serpentine entry path in order to do so; and the screen has a radially outwardly directed substantially continuous lip extension extending from the screen peripheral edge which forms part of the serpentine entry path.
Claim 2
Dependent Claim
167 words
In an engine intake screen assembly of the type having: (a) a shaft that rotates when the engine is running; (b) a screen and a fan, both adapted to be operatively connected to and rotated by the shaft; (c) a fan housing around the fan having a housing wall with an air intake port formed therein, the upstream side of said wall being formed with an upstream directed substantially continuous annular flange that surrounds the intake port; and (d) the screen being positioned upstream of the intake port and flange; the improvement comprising: the screen having a downstream directed substantially continuous peripheral skirt positioned radially outward of said annular flange so as to require foreign matter seeking to enter the air intake port by traveling outside the screen peripheral edge to follow a serpentine entry path in order to do so; and the screen has a radially outwardly directed substantially continuous lip extension extending from the screen peripheral edge which forms part of the serpentine entry path.
Claim 3
Dependent Claim
168 words
In an engine intake screen assembly of the type having: (a) a shaft that rotates when the engine is running; (b) a screen and a fan, both adapted to be operatively connected to and rotated by the shaft; (c) a fan housing around the fan having a housing wall with an air intake port formed therein, the upstream side of said wall being formed with an upstream directed substantially continuous annular flange that surrounds the intake port; and (d) the screen being positioned upstream of the intake port and flange; the improvement comprising: the screen having a downstream directed substantially continuous peripheral skirt positioned radially outward of said annular flange so as to require foreign matter seeking to enter the air intake port by traveling outside the screen peripheral edge to follow a serpentine entry path in order to do so; and a guard ring attached to said wall with a portion positioned upstream of the screen periphery and a portion positioned radially outward of the screen periphery.
Claim 4
Dependent Claim
168 words
In an engine intake screen assembly of the type having: (a) a shaft that rotates when the engine is running; (b) a screen and a fan, both adapted to be operatively connected to and rotated by the shaft; (c) a fan housing around the fan having a housing wall with an air intake port formed therein, the upstream side of said wall being formed with an upstream directed substantially continuous annular flange that surrounds the intake port; and (d) the screen being positioned upstream of the intake port and flange; the improvement comprising: the screen having a downstream directed substantially continuous peripheral skirt positioned radially outward of said annular flange so as to require foreign matter seeking to enter the air intake port by traveling outside the screen peripheral edge to follow a serpentine entry path in order to do so; and a guard ring attached to said wall with a portion positioned upstream of the screen periphery and a portion positioned radially outward of the screen periphery.
Claim 5
Dependent Claim
50 words
The assembly of claim 2, wherein the guard ring has a substantially continuous annular portion extending upstream of said fan housing wall which is positioned radially outward of the screen peripheral edge so as to define a trap between the guard, the screen and the upstream side of said wall.
Claim 6
Dependent Claim
29 words
The assembly of claim 3, wherein the screen has a radially outwardly directed lip extension extending from the screen peripheral edge between the guard ring and fan housing wall.
Claim 7
Dependent Claim
14 words
The assembly of claim 3, wherein the trap widens in the radially outward direction.
References Cited (Backward Citations)
US23146A
Cited
USRE23146E
Cited
US1649220A
Cited
US2034323A
Cited
US2601907A
Cited
US2823656A
Cited
US2834419A
Cited
US2848987A
Cited
US3183899A
Cited
US3276679A
Cited
US3252449A
Cited
US3371471A
Cited
US3566848A
Cited
US3433206A
Cited
US3744468A
Cited
US3994067A
Cited
US3952712A
Cited
US4358303A
Cited
US4261302A
Cited
US4323369A
Cited
US4589379A
Cited
DE3423047A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |