US3601419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid-pressure-operated piston-and-cylinder device
Assignee: Dowty Seals Ltd
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Filing: 1968-05-29
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Granted: 1971-08-24
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Expires: 1988-05-29
Abstract
Abstract A ringlike sealing or wiping member is interposed between a pair of coaxially disposed but relatively slidably engaged cylindrical surfaces, one of which has a stepped contour thereon defining a pair of shoulders, the end walls of which are radially oppositely disposed about the cylindrical axis of the surfaces and spaced apart from one another by a circumferential recess in the one surface. In addition, one of the shoulders is spaced apart from the other of the surfaces, to form a radial clearance which allows for substantial relative radial movement therebetween. The ringlike member is interposed in the recess between the surfaces, and the main body of the member is yieldably biased along the axis of the surfaces in the direction of the radial clearance and the end wall of the one shoulder. The body has a continuously closed annular construction between the inner and outer peripheries thereof, and there are relatively flexible annular limbs on the inner and outer peripheral portions of the member which project from the main body of the same in the aforesaid direction of the bias thereon, and are spaced apart form one another at the ends thereof relatively remote from the body of the member, so that the limbs and body can flex in relation to one another. The end portion of one of the limbs is engaged with the end wall of the one shoulder, whereas the end portion of the other limb extends from the recess into the radial clearance between the surfaces and is engaged with the other surface thereof, in the clearance. There are also means including a space between the ringlike member and the end wall of the other shoulder, whereby the ringlike member is shiftable against the bias thereon.
Inventors
- 👤 Alan G Fern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:14
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3204; F16J15/3232; F16J15/3236
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
281 words
In combination, means defining a pair of coaxially disposed but relatively slidably engaged cylindrical surfaces, one of which has a stepped contour thereon defining a pair of shoulders, the end walls of which are radially oppositely disposed about the cylindrical axis of the surfaces and spaced apart from one another by a circumferential recess in the one surface, one of said shoulders being spaced apart from the other of the surfaces, to form a radial clearance which allows for substantial relative radial movement therebetween, and there being a ringlike member interposed in the recess between the surfaces, the main body of which is yieldably biased along the axis of the surfaces in the direction of the radial clearance and the end wall of the one shoulder, and has a continuously closed annular construction between the inner and outer peripheries thereof, there being relatively flexible annular limbs on the inner and outer peripheral portions of the ringlike member which project from the main body of the same in the aforesaid direction of the bias thereon, and are spaced apart from one another at the ends thereof relatively remote from the body of the member, so that the limbs and body can flex in relation to one another, the end portion of one of which limbs is engaged with the end wall of the one shoUlder, whereas the end portion of the other limb extends from the recess into the radial clearance between the surfaces and is engaged with the other surface thereof, in the clearance, and means including a space between the ringlike member and the end wall of the other shoulder, whereby the ringlike member is shiftable against the bias thereon.
Claim 2
Dependent Claim
281 words
In combination, means defining a pair of coaxially disposed but relatively slidably engaged cylindrical surfaces, one of which has a stepped contour thereon defining a pair of shoulders, the end walls of which are radially oppositely disposed about the cylindrical axis of the surfaces and spaced apart from one another by a circumferential recess in the one surface, one of said shoulders being spaced apart from the other of the surfaces, to form a radial clearance which allows for substantial relative radial movement therebetween, and there being a ringlike member interposed in the recess between the surfaces, the main body of which is yieldably biased along the axis of the surfaces in the direction of the radial clearance and the end wall of the one shoulder, and has a continuously closed annular construction between the inner and outer peripheries thereof, there being relatively flexible annular limbs on the inner and outer peripheral portions of the ringlike member which project from the main body of the same in the aforesaid direction of the bias thereon, and are spaced apart from one another at the ends thereof relatively remote from the body of the member, so that the limbs and body can flex in relation to one another, the end portion of one of which limbs is engaged with the end wall of the one shoUlder, whereas the end portion of the other limb extends from the recess into the radial clearance between the surfaces and is engaged with the other surface thereof, in the clearance, and means including a space between the ringlike member and the end wall of the other shoulder, whereby the ringlike member is shiftable against the bias thereon.
Claim 3
Dependent Claim
17 words
The combination according to claim 1 wherein the surfaces are relatively slidable along the cylindrical axis thereof.
Claim 4
Dependent Claim
39 words
The combination according to claim 1 wherein the end wall of the other shoulder is closed, and there is a resilient biasing member interposed in the space between the ringlike member and the end wall of the other shoulder.
Claim 5
Dependent Claim
20 words
The combination according to claim 3 wherein the resilient biasing member takes the form of a rubber or rubberlike O-ring.
Claim 6
Dependent Claim
30 words
The combination according to claim 3 wherein the resilient biasing member is annular in shape, and spaced apart from the other of the surfaces, to form a radial clearance therebetween.
Claim 7
Dependent Claim
39 words
The combination according to claim 5 wherein the inner peripheral body portion of the ringlike member is spaced apart from the other of the surfaces, but engaged with the resilient biasing member in the latter said radial clearance therebetween.
Claim 8
Dependent Claim
281 words
In combination, means defining a pair of coaxially disposed but relatively slidably engaged cylindrical surfaces, one of which has a stepped contour thereon defining two shoulders, the end walls of which are radially oppositely disposed about the cylindrical axis of the surfaces and spaced apart from one another by a circumferential recess in the one surface, one of said shoulders being of different diameter than the other, whereby a substantial radial clearance is formed between said one shoulder and the other of said surfaces, and there being a ringlike member interposed in the recess between the surfaces, means including a space between the ringlike member and the end wall of the other of said shoulders, whereby the ringlike member is shiftable in the recess along the axis of the surfaces, and a resilient biassing member being interposed in said space, yieldably to bias the ringlike member along the axis of the surfaces in the direction of the end wall of said one shoulder, said ringlike member having a base portion upon which said resilient biassing members bears and two annular limbs which divergingly extend from said base portion, one limb being engaged at its free end portion with the end wall of said one shoulder, and the other limb projecting beyond the plane of that wall into said radial clearance, being engaged at its free end portion with the other of the surfaces, the dimensions of said radial clearance and of the projecting portion of said other limb disposed in that clearance being such that said projecting portion is accommodated in said clearance with freedom to permit substantial movement in the radial sense of one surface with respect to the other.
Claim 9
Dependent Claim
281 words
In combination, means defining a pair of coaxially disposed but relatively slidably engaged cylindrical surfaces, one of which has a stepped contour thereon defining two shoulders, the end walls of which are radially oppositely disposed about the cylindrical axis of the surfaces and spaced apart from one another by a circumferential recess in the one surface, one of said shoulders being of different diameter than the other, whereby a substantial radial clearance is formed between said one shoulder and the other of said surfaces, and there being a ringlike member interposed in the recess between the surfaces, means including a space between the ringlike member and the end wall of the other of said shoulders, whereby the ringlike member is shiftable in the recess along the axis of the surfaces, and a resilient biassing member being interposed in said space, yieldably to bias the ringlike member along the axis of the surfaces in the direction of the end wall of said one shoulder, said ringlike member having a base portion upon which said resilient biassing members bears and two annular limbs which divergingly extend from said base portion, one limb being engaged at its free end portion with the end wall of said one shoulder, and the other limb projecting beyond the plane of that wall into said radial clearance, being engaged at its free end portion with the other of the surfaces, the dimensions of said radial clearance and of the projecting portion of said other limb disposed in that clearance being such that said projecting portion is accommodated in said clearance with freedom to permit substantial movement in the radial sense of one surface with respect to the other.
Claim 10
Dependent Claim
30 words
The combination according to claim 7 wherein the resilient biasing member is annular in shape, and spaced apart from the other of the surfaces, to form a radial clearance therebetween.
Claim 11
Dependent Claim
20 words
The combination according to claim 7 wherein the resilient biasing member takes the form of a rubber or rubberlike O-ring.
References Cited (Backward Citations)
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FR1196448A
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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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |