US4597322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seal assemblies
Assignee: Moog Inc
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Filing: 1984-10-19
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Granted: 1986-07-01
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Expires: 2004-10-19
Abstract
Abstract A seal assembly is arranged to contain leakage of hydraulic fluid passing between a wall opening and a penetrant rod portion passing through the opening. The seal assembly includes a sliding-seal member mounted on a portion of the rod for sliding movement toward and away from an abutment surface and a non-sliding flexible-seal member arranged between the body and the sliding-seal member. The body, flexible-seal member, sliding-seal member and rod define a sealed chamber into which such fluid will leak. The chamber communicates with a fluid reservoir through a oneway check valve. The sliding-seal and flexible-seal members are arranged in parallel with one another. In one embodiment, a spring urges the sliding-seal member to move toward an abutment surface provided on the rod. In another embodiment, movement of the sliding-seal member relative to the body is limited by facing abutment steps.
Inventors
- 👤 Kenneth D. Garnjost
- 👤 David J. Flavell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:04
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/002; F16J15/004; F15; F15B; F15B15/00; F15B15/08; F15B15/14; F15B15/1423; F15B15/1433; F15B15/149
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
146 words
In a fluid-powered actuator having a body and a rod, said body having a portion configured as a wall, said rod having an inner portion arranged on one side of said wall, having a penetrant portion passing through an opening in said wall, and having an outer portion arranged on the other side of said wall, the improvement which comprises: a seal assembly for containing fluid leakage between said rod penetrant portion and said wall opening, said seal assembly including a first abutment surface on one of said body and rod outer portion; a sliding-seal member mounted on said rod outer portion for sealed sliding movement therealong toward and away from said first abutment surface; and a flexible-seal member joining said body and sliding-seal member and defining between said body, said sliding-seal member and said rod outer portion, a sealed chamber communicating with said wall opening.
Claim 2
Dependent Claim
146 words
In a fluid-powered actuator having a body and a rod, said body having a portion configured as a wall, said rod having an inner portion arranged on one side of said wall, having a penetrant portion passing through an opening in said wall, and having an outer portion arranged on the other side of said wall, the improvement which comprises: a seal assembly for containing fluid leakage between said rod penetrant portion and said wall opening, said seal assembly including a first abutment surface on one of said body and rod outer portion; a sliding-seal member mounted on said rod outer portion for sealed sliding movement therealong toward and away from said first abutment surface; and a flexible-seal member joining said body and sliding-seal member and defining between said body, said sliding-seal member and said rod outer portion, a sealed chamber communicating with said wall opening.
Claim 3
Dependent Claim
21 words
The improvement as set forth in claim 1 wherein said first abutment surface has a component facing away from said wall.
Claim 4
Dependent Claim
18 words
The improvement as set forth in claim 2 wherein said first abutment surface is provided on said rod.
Claim 5
Dependent Claim
34 words
The improvement as set forth in claim 3 and further comprising: a resilient member acting between said body and said sliding-seal member for urging said sliding-seal member to move toward said first abutment surface.
Claim 6
Dependent Claim
16 words
The improvement as set forth in claim 4 wherein said resilient member is a coil spring.
Claim 7
Dependent Claim
17 words
The improvement as set forth in claim 4 wherein said resilient member is arranged within said chamber.
Claim 8
Dependent Claim
48 words
The improvement as set forth in claim 4 wherein said sliding-seal member may move away from said first abutment surface when the force attributable to the pressure within said chamber exerted on said sliding-seal member exceeds the opposing force exerted on said sliding-seal member by said resilient member.
Claim 9
Dependent Claim
23 words
The improvement as set forth in claim 1 and further comprising: A valve operatively arranged to relieve excess pressure within said sealed chamber.
Claim 10
Dependent Claim
24 words
The improvement as set forth in claim 8 wherein said valve is a check valve operatively arranged to permit fluid to exit said chamber.
Claim 11
Dependent Claim
18 words
The improvement as set forth in claim 2 wherein said first abutment surface is provided on said body.
Claim 12
Dependent Claim
30 words
The improvement as set forth in claim 10 and further comprising a second abutment surface provided on said body and having a component facing toward said first abutment surface component.
Claim 13
Dependent Claim
28 words
The improvement as set forth in claim 11 wherein said sliding-seal member is mounted for movement relative to said body between said first and second abutment surface components.
Claim 14
Dependent Claim
42 words
The improvement as set forth in claim 12 wherein said flexible-seal member is movable between a fully-extended position and a fully-retracted position, and wherein said flexible-seal member is substantially in said fully-retracted position when said sliding-seal member engages said second abutment surface.
Claim 15
Dependent Claim
43 words
The improvement as set forth in claim 13 wherein said flexible-seal member has an unbaised free length, and wherein said slidable-seal member is positioned substantially half-way between said first and second abutment surfaces when said flexible-seal member is at said unbiased free length.
Claim 16
Dependent Claim
44 words
The improvement as set forth in claim 14 wherein said flexible-seal member exerts a force on said sliding-seal member which urges said sliding seal member to move relative to said rod outer portion whenever said flexible-seal member is displaced from said unbiased free length.
Claim 17
Dependent Claim
15 words
The improvement as set forth in claim 1 wherein said flexible-seal member is a bellows.
Claim 18
Dependent Claim
46 words
The improvement as set forth in claim 1 and further comprising a frictional element operatively arranged between said sliding-seal member and said rod outer portion to provide a desired level of frictional resistance to relative sliding movement between said sliding-seal member and said rod outer portion.
Claim 19
Dependent Claim
21 words
The improvement as set forth in claim 1 and further comprising: relief means for relieving excess pressure within said sealed chamber.
Claim 20
Dependent Claim
15 words
The improvement as set forth in claim 18 wherein said relief means is a valve.
Claim 21
Dependent Claim
157 words
In a fluid-powered actuator having a body and a rod, said body having a portion configured as a wall and provided with an opening therethrough, said rod having an inner portion arranged on one side of said wall, a penetrant portion passing through said wall opening, and an outer portion arranged on the other side of said wall, the improvement which comprises: a seal assembly for containing fluid leaking between said rod penetrant portion and said wall opening, said seal assembly including a sliding-seal member mounted on said rod outer portion for sealed sliding movement therealong, and a flexible-seal member having one end sealingly connected to said body and having another end sealingly connected to said sliding-seal member, said flexible-seal being movable within a displacement range relative to said body, the frictional forces between said sliding-seal member and said rod outer portion being greater than the force required to move said flexible-seal member throughout said displacement range.
Claim 22
Dependent Claim
157 words
In a fluid-powered actuator having a body and a rod, said body having a portion configured as a wall and provided with an opening therethrough, said rod having an inner portion arranged on one side of said wall, a penetrant portion passing through said wall opening, and an outer portion arranged on the other side of said wall, the improvement which comprises: a seal assembly for containing fluid leaking between said rod penetrant portion and said wall opening, said seal assembly including a sliding-seal member mounted on said rod outer portion for sealed sliding movement therealong, and a flexible-seal member having one end sealingly connected to said body and having another end sealingly connected to said sliding-seal member, said flexible-seal being movable within a displacement range relative to said body, the frictional forces between said sliding-seal member and said rod outer portion being greater than the force required to move said flexible-seal member throughout said displacement range.
Claim 23
Dependent Claim
23 words
The improvement as set forth in claim 20 wherein said sliding-seal member and said flexible-seal member are arranged in parallel with one another.
Claim 24
Dependent Claim
164 words
In a fluid-powered actuator having a body and a rod, said body having a portion configured as a wall and provided with an opening therethrough, said rod having a penetrant portion passing through said wall opening and having an outer portion arranged on one side of said wall, the improvement which comprises: a seal assembly for containing fluid leaking between said rod penetrant portion and said wall opening toward said wall one side, said seal assembly including a sliding-seal member mounted on said rod outer portion for sealed sliding movement therealong, a flexible-seal member having one end sealingly connected to said body and having another end sealingly connected to said sliding-seal member to form a variable-volume chamber to receive fluid leaking between said wall opening and said rod penetrant portion, and biasing means for urging said sliding-seal member to move with said rod but permitting said sliding-seal member to move relative to said rod when the pressure in said chamber exceeds a predetermined pressure.
Claim 25
Dependent Claim
164 words
In a fluid-powered actuator having a body and a rod, said body having a portion configured as a wall and provided with an opening therethrough, said rod having a penetrant portion passing through said wall opening and having an outer portion arranged on one side of said wall, the improvement which comprises: a seal assembly for containing fluid leaking between said rod penetrant portion and said wall opening toward said wall one side, said seal assembly including a sliding-seal member mounted on said rod outer portion for sealed sliding movement therealong, a flexible-seal member having one end sealingly connected to said body and having another end sealingly connected to said sliding-seal member to form a variable-volume chamber to receive fluid leaking between said wall opening and said rod penetrant portion, and biasing means for urging said sliding-seal member to move with said rod but permitting said sliding-seal member to move relative to said rod when the pressure in said chamber exceeds a predetermined pressure.
Claim 26
Dependent Claim
25 words
The improvement as set forth in claim 22 wherein said biasing means is a spring arranged to act between said body and said sliding-seal member.
Claim 27
Dependent Claim
26 words
The improvement as set forth in claim 22 wherein said biasing means are provided by frictional forces between said sliding-seal member and said rod outer portion.
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) | 1989-06-30 | 1989-12-30 | 1990-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-30 | 1993-12-30 | 1994-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-30 | 1997-12-30 | 1998-07-01 | $7700.00 | Window Closed / Lapsed |