US4246833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure spherical piston
Assignee: United States Department of the Navy
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Filing: 1978-12-29
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Granted: 1981-01-27
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Expires: 1998-12-29
Abstract
Abstract A spherical piston for high-pressure applications. By shifting the o-ring oove to the pressure side of the major diameter of a spherical piston such that one edge of the groove is the major diameter, a very close fitting spherical piston that will not have metal to metal interference is created. Contrary to traditional spherical pistons, the spherical diameter of the present invention is less than the diameter of a cylinder wall. Elimination of metal to metal interference between the piston and the cylinder wall permits the piston to be made of harder metal than the cylinder wall without concern for damage if the piston cants on its axis within the cylinder.
Inventors
- 👤 Vernon D. Burklund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:04
CPC Classifications
F; F16; F16J; F16J1/00; F16J1/001
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
165 words
A high pressure single-acting spherical piston assembly comprising: a block with a cylindrical opening of predetermined diameter for containing pressurized fluid; a reciprocating spherical piston with a major diameter and a single-acting side within said cylindrical opening for working with said fluid to perform a predetermined task with said contained pressurized fluid and where said spherical piston has a spherical diameter equal to said major diameter but less than the diameter of said cylindrical opening; and an o-ring placed in an o-ring groove on said spherical piston parallel to the major diameter of said spherical piston for closing a diametrical clearance equal to the difference between said cylinder diameter and said piston major diameter where said o-ring is on the single-acting side of said spherical piston such that one side of said o-ring groove forms a portion of the major diameter of said spherical piston such that said spherical piston can rock within said cylindrical opening without physical contact between said piston and said block.
Claim 2
Dependent Claim
165 words
A high pressure single-acting spherical piston assembly comprising: a block with a cylindrical opening of predetermined diameter for containing pressurized fluid; a reciprocating spherical piston with a major diameter and a single-acting side within said cylindrical opening for working with said fluid to perform a predetermined task with said contained pressurized fluid and where said spherical piston has a spherical diameter equal to said major diameter but less than the diameter of said cylindrical opening; and an o-ring placed in an o-ring groove on said spherical piston parallel to the major diameter of said spherical piston for closing a diametrical clearance equal to the difference between said cylinder diameter and said piston major diameter where said o-ring is on the single-acting side of said spherical piston such that one side of said o-ring groove forms a portion of the major diameter of said spherical piston such that said spherical piston can rock within said cylindrical opening without physical contact between said piston and said block.
Claim 3
Dependent Claim
29 words
A high pressure single-acting spherical piston as described in claim 1 further comprising a lubrication means within said block for preventing binding of said O-ring within said cylindrical opening.
Claim 4
Dependent Claim
19 words
A high pressure single-acting spherical piston assembly as described in claim 2 where said block is made of aluminum.
Claim 5
Dependent Claim
21 words
A high pressure single-acting spherical piston assembly as described in claim 2 where said reciprocating spherical piston is made of steel.
Claim 6
Dependent Claim
32 words
A high pressure single-acting spherical piston assembly as described in claim 2 where said O-ring is composed of silicon rubber of shore hardness 90 for preventing rollup or extrusion of said o-ring.
Claim 7
Dependent Claim
26 words
A high pressure single-acting piston assembly as described in claim 2 wherein said lubrication means comprises a solid film lubricant on the walls of said block.
Claim 8
Dependent Claim
19 words
A high pressure single-acting spherical piston assembly as described in claim 1 where said block is made of aluminum.
Claim 9
Dependent Claim
21 words
A high pressure single-acting spherical piston assembly as described in claim 1 where said reciprocating spherical piston is made of steel.
Claim 10
Dependent Claim
32 words
A high pressure single-acting spherical piston assembly as described in claim 1 where said o-ring is composed of silicon rubber of shore hardness 90 for preventing rollup or extrusion of said o-ring.
Claim 11
Dependent Claim
170 words
A high pressure single-acting spherical piston assembly comprising: an aluminum block with a cylindrical walled opening of predetermined diameter for containing pressurized fluid; a reciprocating steel spherical piston with a major diameter and a single-acting side within said cylindrical walled opening for working with said fluid to perform a predetermined task with said contained pressurized fluid and where said spherical piston has a spherical diameter equal to said major diameter but less than the diameter of said cylindrical walled opening; and an o-ring placed in an o-ring groove on said spherical piston parallel to the major diameter of said spherical piston for closing a diametrical clearance equal to the difference between said cylinder diameter and said piston major diameter where said o-ring is on the single-acting side of said spherical piston such that one side of said o-ring groove forms a portion of the major diameter of said spherical piston such that said spherical piston can rock within said cylindrical opening without physical contact between said piston and said block.
Claim 12
Dependent Claim
170 words
A high pressure single-acting spherical piston assembly comprising: an aluminum block with a cylindrical walled opening of predetermined diameter for containing pressurized fluid; a reciprocating steel spherical piston with a major diameter and a single-acting side within said cylindrical walled opening for working with said fluid to perform a predetermined task with said contained pressurized fluid and where said spherical piston has a spherical diameter equal to said major diameter but less than the diameter of said cylindrical walled opening; and an o-ring placed in an o-ring groove on said spherical piston parallel to the major diameter of said spherical piston for closing a diametrical clearance equal to the difference between said cylinder diameter and said piston major diameter where said o-ring is on the single-acting side of said spherical piston such that one side of said o-ring groove forms a portion of the major diameter of said spherical piston such that said spherical piston can rock within said cylindrical opening without physical contact between said piston and said block.
Claim 13
Dependent Claim
34 words
A high pressure single-acting spherical piston assembly as described in claim 10 further comprising a lubrication means within said block for preventing binding of said o-ring with said cylindrical walled opening in said block.
Claim 14
Dependent Claim
32 words
A high pressure single-acting spherical piston assembly as described in claim 10 where said o-ring is composed of silicon rubber of shore hardness 90 for preventing rollup or extrusion of said o-ring.
Claim 15
Dependent Claim
32 words
A high pressure single-acting spherical piston assembly as described in claim 11 where said o-ring is composed of silicon rubber of shore hardness 90 for preventing rollup or extrusion of said o-ring.
Claim 16
Dependent Claim
26 words
A high pressure single-acting piston assembly as described in claim 11 wherein said lubrication means comprises a solid film lubricant on the walls of said block.
References Cited (Backward Citations)
US2710137A
Cited
US2792790A
Cited
US2956845A
Cited
US3035879A
Cited
US3181779A
Cited
US3320902A
Cited
US3695150A
Cited
US3716310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |