Patent US3921669A successfully refreshed from Google Patents.
US3921669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integral power steering gear and sintered metal valve sleeve therefor
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1974-05-10
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Granted: 1975-11-25
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Expires: 1994-05-10
Abstract
Abstract An integral power steering gear in which the valve mechanism comprises a rotary valve including a sintered metal valve sleeve. The valve sleeve is formed of two separate sintered metal elements bonded together to provide a unitary structure. Cooperating and locking and bonding protuberances and recesses are formed on the mating faces of the two elements to include axially extending bonding surfaces which intersect the inner bore of the sleeve. Frequently grooves are formed in the cylindrical bore of the sleeve at the intersection of the abutting surfaces and the bore as the surfaces extend circumferentially or cylindrically about the bore. However, it has been found that such grooves do not occur along the axially extending abutting surfaces and, therefore, the axially extending abutting surfaces prevent leakage.
Inventors
- 👤 Raymon L Goff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:16
CPC Classifications
B; B62; B62D; B62D5/00; B62D5/06; B62D5/20; B62D5/24; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86638; Y10T137/86646; Y10T137/86662; Y10T29/00; Y10T29/49; Y10T29/49405; Y10T29/49412
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
122 words
A valve assembly including a valve sleeve comprising first and second valve elements formed of sintered metal and physically bonded together in abutting end-to-end relationship to define a unitary valve structure having generally cylindrically shaped inner and outer peripheral wall surfaces forming the inner and outer peripheral confines of said valve sleeve, a pair of first and second axially extending fluid flow passages opening into said inner peripheral wall surface, said first and second passages being spaced circumferentially about said inner peripheral wall surface, said first and second valve elements having interlocking abutting ends which include a plurality of cooperating abutting and generally axially extending bonding surfaces intersecting said inner peripheral wall surface and circumferentially spaced between said first and second passages.
Claim 2
Dependent Claim
122 words
A valve assembly including a valve sleeve comprising first and second valve elements formed of sintered metal and physically bonded together in abutting end-to-end relationship to define a unitary valve structure having generally cylindrically shaped inner and outer peripheral wall surfaces forming the inner and outer peripheral confines of said valve sleeve, a pair of first and second axially extending fluid flow passages opening into said inner peripheral wall surface, said first and second passages being spaced circumferentially about said inner peripheral wall surface, said first and second valve elements having interlocking abutting ends which include a plurality of cooperating abutting and generally axially extending bonding surfaces intersecting said inner peripheral wall surface and circumferentially spaced between said first and second passages.
Claim 3
Dependent Claim
31 words
An assembly as set forth in claim 1 wherein said axially extending bonding surfaces are defined by interlocking lug and recess means formed on the abutting ends of said valve elements.
Claim 4
Dependent Claim
35 words
An assembly as set forth in claim 2 wherein said interlocking lug and recess means comprises additional cooperating and abutting wall surfaces extending circumferentially and radially with respect to the axis of said valve sleeve.
Claim 5
Dependent Claim
26 words
An assembly as set forth in claim 3 including means defining cooperating axially extending radially angularly aligned alignment rib and groove means on said valve elements.
Claim 6
Dependent Claim
35 words
An assembly as set forth in claim 1 wherein said first passage extends into both of said first and second valve elements whereby said abutting ends of said valve elements meet along said first passage.
Claim 7
Dependent Claim
51 words
An assembly as set forth in claim 1 including a cylindrically-shaped valve member having a plurality of axially extending grooves formed in the periphery thereof and rotatably disposed within said valve sleeve whereby said grooves in said valve member cooperate with said passages in said sleeve to perform a valving function.
Claim 8
Dependent Claim
32 words
An assembly as set forth in claim 1 wherein said first valve element includes an enlarged cylindrical bore extending into one end thereof, said second valve element being disposed in said bore.
Claim 9
Dependent Claim
38 words
An assembly as set forth in claim 7 including means defining cooperating axially extending radially angularly aligned alignment rib and groove means on said valve elements between said bore and the outer circumference of said second valve element.
Claim 10
Dependent Claim
42 words
An assembly as set forth in claim 7 wherein said second passage terminates at the bottom of said cylindrical bore and including an axial fluid passage extending from said second passage through said second valve element to the end of said sleeve.
Claim 11
Dependent Claim
35 words
An assembly as set forth in claim 9 wherein said first passage extends into both of said first and second valve elements whereby said abutting ends of said valve elements meet along said first passage.
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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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |