US3608724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil filters with front-end bypass valve
Assignee: Baldwin Filters Inc
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Filing: 1970-01-07
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Granted: 1971-09-28
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Expires: 1990-01-07
Abstract
Abstract An oil filter incorporating a front-end bypass valve interposed between the baseplate providing the front or bottom closure of the filter shell and a filter element contained therein. Said bypass valve is so constructed as to provided a relatively elongated and unobstructed annular oil flow channel therethrough which at its lower end is in full open communication with the interior space of the filter adjacent its lower, oil-entering end and whose upper end connects to the oil outlet opening of the filter via a ring valve which is urged to its seated, channelclosing position by a spring reactive against its upper face. The arrangement is such that when oil pressure within the interior space of the filter, and which is always effective on the under face of the ring valve, exceeds the seating force exerted by said spring on the upper face thereof, due to normal oil flow through the filter element being restricted because of clogging or the oil being too viscous as to readily flow therethrough, the bypass valve provides an alternate path of oil flow between the filter oil inlet and filter oil outlet openings, which path is characterized by a minimum obstruction and is further sufficiently elongated as to reduce restriction of oil flow due to turbulence caused by change of oil flow direction.
Inventors
- 👤 Jesse A Baldwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:18
CPC Classifications
B; B01; B01D; B01D27/00; B01D27/08; B01D27/10; B01D27/103; B01D27/106; B01D27/14; B01D27/142; B01D27/144
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
299 words
An oil filter comprising a filter shell closed at its front end by a closure plate having a plurality of circumferentially spaced, oil-entry openings and an inturned neck whose bore provides a central oil outlet opening, an annular filter element enclosed within said closed filter shell and means mounting same in the normal path of oil flow between said oil entry and oil outlet openings for filtering the oil flowing therebetween, and bypass valve means also enclosed within said closed filter shell and operative to provide an alternate path of oil flow between said oil entry and oil outlet openings responsive to increased oil pressure developing within the closed filter shell with restriction of oil flow through said filter element, said bypass valve means comprising a cylindrical valve-body member interposed between said front-end closure plate and said filter element, a tubular member of lesser diameter than and being mounted coaxially within said valve-body member and forming therewith a relatively elongated closed-bottom open-top passage, said valvebody member being provided in its lower periphery with nonvalved oil entry openings which establish full open communication between the interior space of the closed filter shell adjacent its front end and said annular passage, annular upwardly facing valve seat means at the open-top end of said passage, a ring valve operatively associated with said valve seat means and being movable between a seated position in which it closes off the open-top end of said annular passage and a raised position in which it places said annular passage in full-open communication with said central oil outlet opening, and spring means mounted exteriorly of said passage for maintaining said ring valve seated but allowing said valve to move to its raised position upon predetermined increase of oil pressure developing within the closed filter shell as aforesaid.
Claim 2
Dependent Claim
299 words
An oil filter comprising a filter shell closed at its front end by a closure plate having a plurality of circumferentially spaced, oil-entry openings and an inturned neck whose bore provides a central oil outlet opening, an annular filter element enclosed within said closed filter shell and means mounting same in the normal path of oil flow between said oil entry and oil outlet openings for filtering the oil flowing therebetween, and bypass valve means also enclosed within said closed filter shell and operative to provide an alternate path of oil flow between said oil entry and oil outlet openings responsive to increased oil pressure developing within the closed filter shell with restriction of oil flow through said filter element, said bypass valve means comprising a cylindrical valve-body member interposed between said front-end closure plate and said filter element, a tubular member of lesser diameter than and being mounted coaxially within said valve-body member and forming therewith a relatively elongated closed-bottom open-top passage, said valvebody member being provided in its lower periphery with nonvalved oil entry openings which establish full open communication between the interior space of the closed filter shell adjacent its front end and said annular passage, annular upwardly facing valve seat means at the open-top end of said passage, a ring valve operatively associated with said valve seat means and being movable between a seated position in which it closes off the open-top end of said annular passage and a raised position in which it places said annular passage in full-open communication with said central oil outlet opening, and spring means mounted exteriorly of said passage for maintaining said ring valve seated but allowing said valve to move to its raised position upon predetermined increase of oil pressure developing within the closed filter shell as aforesaid.
Claim 3
Dependent Claim
16 words
An oil filter according to claim 1, wherein said cylindrical valve-body member provides said filter-element-mounting means.
Claim 4
Dependent Claim
56 words
An oil filter according to claim 1, wherein said valve seat means comprises coplanar and concentric outwardly and inwardly turned steps on the valve-body and inner tubular members, respectively, on which the outer and inner marginal edges of the ring valve seatably engage under the bias of said spring means effective on said valve as aforesaid.
Claim 5
Dependent Claim
49 words
An oil filter according to claim 1, wherein said valve-body and inner tubular members are together centered on said inturned neck of the closure plate and extend coaxially with respect to the filter element, and wherein said cylindrical valve-body member directly supports said filter element from the closure plate.
Claim 6
Dependent Claim
77 words
An oil filter according to claim 4, and further including antidrainback valve means for closing said oil entry openings in the closure plate to reverse oil flow therethrough including a flexible-material annular valve member also centered on said inturned neck of the closure plate and being held thereto along its inner edge portion by said similarly centered valve-body and inner tubular membErs of the bypass valve, between which and the closure plate said inner edge is interposed.
Claim 7
Dependent Claim
54 words
An oil filter according to claim 4, wherein said inner tubular member has substantially greater axial length than said valve-body member and its upper end portion extends into the central opening of the annular filter element and terminates in a spring retaining flange, between which and said ring valve said spring means is reactive.
Claim 8
Dependent Claim
70 words
An oil filter according to claim 6, wherein said tubular member provides an inward extension of said filter outlet opening and its upper end portion has lesser diameter than that of said central opening of the filter element into which it extends, thereby forming with the central-opening wall an annular passage which extends in continuation of said ring-valve-controlled annular passage and connects the latter passage with the filter outlet opening.
References Cited (Backward Citations)
GB950810A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |