Patent US4140047A successfully refreshed from Google Patents.
US4140047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mobile cab with air filter
Assignee: Blue Leaf IP Inc
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Filing: 1978-04-07
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Granted: 1979-02-20
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Expires: 1998-04-07
Abstract
Abstract Mobile vehicles and the like having enclosed cabs such as tractors, combines and the like, are provided with air inlet means for the comfort of the operator. The air inlet means are provided with a readily removable filter element and means to support the same by an overhanging forward portion of the roof which extends beyond the windshield of the cab. The filter element is supported by a frame and includes means to raise and lower the frame respectively to support the filter element in upper, operative position and lower, removable position, insertion and removal of the same occurring through an opening adjacent one side edge of the roof of the cab and normally closed by a door, the entire removal occurring exteriorly of the interior of the cab.
Inventors
- 👤 Robert L. Bowman
- 👤 Edwin O. Margerum
- 👤 Mark L. Cozine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:03
CPC Classifications
B; B60; B60H; B60H3/00; B60H3/06; B60H3/0608; B60H3/0616
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
201 words
A mobile vehicle having an enclosed cab including a front window and a roof having an extension thereon directed forwardly a limited distance from said window above the same and having opposed sides in combination with a housing connected to said roof extension for support thereby forwardly of said window and having an exposed wall extending substantially between the sides of said roof extension and provided with an elongated air inlet opening therein of appreciable length extending transversely between said sides of said roof extension and forwardly of said window, an air discharge opening in said housing being in flow communication with the interior of said cab, an air filter element substantially coextensive in area with said air inlet opening, a frame supporting said filter element above said air inlet opening, means supporting said frame for movement between an upper operative position for said filter element and a lower position for removal of said filter element, an access opening in one end of said housing adjacent one side of said roof extension and in alignment with one end of said frame and through which said filter element can be inserted and removed, and means operable to move said frame as aforesaid.
Claim 2
Dependent Claim
201 words
A mobile vehicle having an enclosed cab including a front window and a roof having an extension thereon directed forwardly a limited distance from said window above the same and having opposed sides in combination with a housing connected to said roof extension for support thereby forwardly of said window and having an exposed wall extending substantially between the sides of said roof extension and provided with an elongated air inlet opening therein of appreciable length extending transversely between said sides of said roof extension and forwardly of said window, an air discharge opening in said housing being in flow communication with the interior of said cab, an air filter element substantially coextensive in area with said air inlet opening, a frame supporting said filter element above said air inlet opening, means supporting said frame for movement between an upper operative position for said filter element and a lower position for removal of said filter element, an access opening in one end of said housing adjacent one side of said roof extension and in alignment with one end of said frame and through which said filter element can be inserted and removed, and means operable to move said frame as aforesaid.
Claim 3
Dependent Claim
33 words
The vehicle and cab according to claim 1 in which said means movably supporting said frame comprising linkage means adjacent opposite ends of said frame connected movably to said frame and said housing.
Claim 4
Dependent Claim
67 words
The vehicle and cab according to claim 2 in which the linkage means at one end of said frame extends at an angle to the vertical in operative position and movable to at least a lesser angle to the vertical to move said end of said frame to said lower position thereof and the linkage means for the opposite end of said frame is a toggle arrangement.
Claim 5
Dependent Claim
38 words
The vehicle and cab according to claim 3 in which said housing includes an outwardly and downwardly sloping surface interengageable with said opposite end of said frame to effect movement of said end to said lower position thereof.
Claim 6
Dependent Claim
49 words
The vehicle and cab according to claim 4 in which said toggle arrangement includes a pair of links each having one end pivoted together and the opposite ends of said links respectively being pivotally connected to said opposite end of said frame and said housing adjacent said access opening.
Claim 7
Dependent Claim
41 words
The vehicle and cab according to claim 5 in which one of said links of said toggle arrangement has a manually engageable handle thereon comprising said means to move said frame as aforesaid, said handle being accessible through said access opening.
Claim 8
Dependent Claim
42 words
The vehicle and cab according to claim 1 further including flange means depending from the upper part of said housing and operable to position th upper portion of said filter element operatively when said frame is in the upper operative positon thereof.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |