US3559540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic actuator
Assignee: Individual
•
Filing: 1968-08-06
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Granted: 1971-02-02
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Expires: 1988-08-06
Abstract
Abstract A hydraulic actuator of the lineal type which comprises a cylinder and piston with an output shaft journaled in a head mounted in one end of the cylinder. The invention is directed to the mounting of a bearing relative to a dynamic seal and wiper seal in the head or shaft guide closing the end of the cylinder and the location of the same relative to journaled surfaces on the piston together with an adjustable mounting of the head within the cylinder.
Inventors
- 👤 Arnold C Sheldon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:32
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/08; F15B15/14; F15B15/1423; F15B15/1438; F15B15/1433; F15B15/149; F16; F16J; F16J10/00; F16J10/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
424 words
A hydraulic actuator comprising: a cylinder member closed at one extremity; a head member positioned in part in an open extremity of the cylinder member; said head member having a central bore therethrough with a plurality of grooved recesses extending from the surface of the bore and distributed along the extent of the same; a piston mounted on a shaft and positioned in the cylinder member with the shaft extending through the bore of the head member; said piston having a bearing surface and sealing means positioned on the peripheral surface of the piston to engage on the internal wall on the cylinder member; means adapted to introduce a motive fluid into one end of the cylinder member to be effective on one side of said piston including a port in the head member leading to one of the plurality of recesses common to the bore of the head member within the confines of the cylinder member and to an aperture in the cylinder member aligned with the port; said port being adapted to receive a fitting to provide a passage Into the cylinder member which prevents rotation of the head member within the cylinder member; a first seal positioned in one of the recesses of the bore of the head member adjacent the outside surface thereof and remote from the cylinder member and bearing on the shaft; a self lubricated sleeve bearing fitted into another of the recesses in the bore of the head member located inboard of the first seal and adapted to receive and journal the piston shaft clear of the head member; a second seal formed of a material and into a configuration which does not permit leakage located in a further of the recesses of the bore and positioned medial to said sleeve bearing and abutting one edge of the sleeve bearing to be supported in part by the same; said further recess for the second seal having a side which aligns with the edge of the sleeve bearing and is normal to the extent of the shaft; said cylinder member having a threaded peripheral surface at one extremity thereof; said head member including an external flange on the periphery near one extremity of the same; and including a cap member having a threaded interior surface and an aperture in the one end of the same fitted over the shaft and the flange of the head member and coupling with the threaded surface of the cylinder member to secure the head member in the end of the cylinder member.
Claim 2
Dependent Claim
424 words
A hydraulic actuator comprising: a cylinder member closed at one extremity; a head member positioned in part in an open extremity of the cylinder member; said head member having a central bore therethrough with a plurality of grooved recesses extending from the surface of the bore and distributed along the extent of the same; a piston mounted on a shaft and positioned in the cylinder member with the shaft extending through the bore of the head member; said piston having a bearing surface and sealing means positioned on the peripheral surface of the piston to engage on the internal wall on the cylinder member; means adapted to introduce a motive fluid into one end of the cylinder member to be effective on one side of said piston including a port in the head member leading to one of the plurality of recesses common to the bore of the head member within the confines of the cylinder member and to an aperture in the cylinder member aligned with the port; said port being adapted to receive a fitting to provide a passage Into the cylinder member which prevents rotation of the head member within the cylinder member; a first seal positioned in one of the recesses of the bore of the head member adjacent the outside surface thereof and remote from the cylinder member and bearing on the shaft; a self lubricated sleeve bearing fitted into another of the recesses in the bore of the head member located inboard of the first seal and adapted to receive and journal the piston shaft clear of the head member; a second seal formed of a material and into a configuration which does not permit leakage located in a further of the recesses of the bore and positioned medial to said sleeve bearing and abutting one edge of the sleeve bearing to be supported in part by the same; said further recess for the second seal having a side which aligns with the edge of the sleeve bearing and is normal to the extent of the shaft; said cylinder member having a threaded peripheral surface at one extremity thereof; said head member including an external flange on the periphery near one extremity of the same; and including a cap member having a threaded interior surface and an aperture in the one end of the same fitted over the shaft and the flange of the head member and coupling with the threaded surface of the cylinder member to secure the head member in the end of the cylinder member.
Claim 3
Dependent Claim
39 words
The hydraulic actuator of claim 1 in which the cap means at the aperture has dimensions which permit adjustment of the head member within the cylinder member to allow alignment of the pistons and shaft with the cylinder member.
Claim 4
Dependent Claim
296 words
A hydraulic actuator comprising: a cylinder member closed at one extremity; a head member positioned in part in an open extremity of the cylinder member; said head member having a central bore therethrough with a plurality of grooved recesses extending from the surface of the bore and distributed along the extent of the same; a piston mounted on a shaft and positioned in the cylinder member with the shaft extending through the bore of the head member; said piston having a bearing surface and sealing means positioned on the peripheral surface of the piston to engage on the internal wall on the cylinder member; means adapted to introduce a motor fluid into the cylinder member to at least one side of the piston; a first seal positioned in one of the recesses of the bore of the head member adjacent the outside surface thereof and remote from the cylinder member and bearing on the shaft; a self lubricated sleeve bearing fitted into another of the recesses in the bore of the head member located inboard of the first seal and adapted to receive and journal the piston shaft clear of the head member; a second seal formed of a material and into a configuration which does not permit leakage located in a further of the recesses of the bore and positioned medial to said sleeve bearing and abutting one edge of the sleeve bearing to be supported in part by the same; means for securing the head member to the end of the cylinder member, and including a passage in the closed end of the cylinder member and a pair of dynamic seal members forming the sealing means positioned on the peripheral surface of the piston to either side of the bearing surface on the piston.
Claim 5
Dependent Claim
296 words
A hydraulic actuator comprising: a cylinder member closed at one extremity; a head member positioned in part in an open extremity of the cylinder member; said head member having a central bore therethrough with a plurality of grooved recesses extending from the surface of the bore and distributed along the extent of the same; a piston mounted on a shaft and positioned in the cylinder member with the shaft extending through the bore of the head member; said piston having a bearing surface and sealing means positioned on the peripheral surface of the piston to engage on the internal wall on the cylinder member; means adapted to introduce a motor fluid into the cylinder member to at least one side of the piston; a first seal positioned in one of the recesses of the bore of the head member adjacent the outside surface thereof and remote from the cylinder member and bearing on the shaft; a self lubricated sleeve bearing fitted into another of the recesses in the bore of the head member located inboard of the first seal and adapted to receive and journal the piston shaft clear of the head member; a second seal formed of a material and into a configuration which does not permit leakage located in a further of the recesses of the bore and positioned medial to said sleeve bearing and abutting one edge of the sleeve bearing to be supported in part by the same; means for securing the head member to the end of the cylinder member, and including a passage in the closed end of the cylinder member and a pair of dynamic seal members forming the sealing means positioned on the peripheral surface of the piston to either side of the bearing surface on the piston.
Claim 6
Dependent Claim
38 words
The hydraulic actuator of claim 6 and including an additional seal member on the peripheral edge of the head member positioned within the cylinder member and sealing the head member to the inner wall of the cylinder member.
Claim 7
Dependent Claim
48 words
The hydraulic actuator of claim 3 in which the sleeve bearing is made of a steel backing material coated on the inner surface with a sintered bronze material and powered lead material and covered with a teflon coating to be exposed to the shaft for supporting the same.
Claim 8
Dependent Claim
78 words
The hydraulic actuator of claim 3 in which the first seal member is a wiper seal and the second seal member abutting the edge of the sleeve bearing is a static and dynamic sEal preventing flow of motive fluid in the hydraulic cylinder from passing through the head member and along the shaft to the sleeve bearing with the sleeve bearing having a dry lubricant and acting as the sole support for the shaft in the head member.
Claim 9
Dependent Claim
47 words
The hydraulic actuator of claim 3 in which the head member has the sleeve bearing disposed adjacent the second seal member with the recesses and the seal members being concentric and in which the sleeve bearing is press fitted into said another recess in the head member.
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |