Patent US3855906A successfully refreshed from Google Patents.
US3855906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact free and directly cooled piston arrangement
Assignee: Individual
•
Filing: 1974-03-15
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Granted: 1974-12-24
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Expires: 1994-03-15
Abstract
Abstract A mushroomed type piston is mounted on the top of a reciprocating hollow cylindrical piston bushing. The piston has a flanged side wall extending downwardly adjacent to and parallel to the piston cylinder wall so that an annular space is formed between the piston side wall and the piston bushing. A supporting wall extends upwardly into the annular space and sliding bearing pieces are mounted on the supporting wall and slidably provide frictionless support for the piston bushing. Provided on the exterior of the flanged side wall of the piston is a contact-free labyrinth packing or seal which serves the dual function of sealing and cooling the piston. Inlet and outlet ports are provided through the piston side wall to admit carburant and cooling air, and to exhaust combustants.
Inventors
- 👤 Ertel M Mohrenstein
- 👤 Ertel A Mohrenstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 00:52
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/32; F02F; F02F3/00; F02F3/28; F02B75/02; F02B2075/022; F02B2075/025; F05; F05C; F05C2201/00; F05C2201/04; F05C2201/0433; F05C2201/0448
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
187 words
In a device having a cylindrical chamber having a cylindrical wall and inlet and outlet ports on opposite side of the chamber, a contact-free piston arrangement comprising: a supporting wall mounted within the chamber at the lower portion of the chamber to form an annular recession between said supporting wall and the cylindrical wall of the chamber; annular bushing means mounted on said supporting wall capable of being biased inwardly; a cylindrical sleeve slidably supported and guided by said bushing means for movement between a first position and a second position within the chamber; a piston head mounted on said sleeve, said piston head dimensioned to slide within the chamber without contacting the cylindrical wall of the chamber, said piston head having an annular cylindrical side wall essentially parallel to said sleeve and adapted to extend into the annular recession between the cylindrical wall of the chamber and said supporting wall when said sleeve is in its first position, and said piston head having annular grooves formed in said side wall to form a labyrinth seal between said piston head and the cylindrical wall of the chamber.
Claim 2
Dependent Claim
187 words
In a device having a cylindrical chamber having a cylindrical wall and inlet and outlet ports on opposite side of the chamber, a contact-free piston arrangement comprising: a supporting wall mounted within the chamber at the lower portion of the chamber to form an annular recession between said supporting wall and the cylindrical wall of the chamber; annular bushing means mounted on said supporting wall capable of being biased inwardly; a cylindrical sleeve slidably supported and guided by said bushing means for movement between a first position and a second position within the chamber; a piston head mounted on said sleeve, said piston head dimensioned to slide within the chamber without contacting the cylindrical wall of the chamber, said piston head having an annular cylindrical side wall essentially parallel to said sleeve and adapted to extend into the annular recession between the cylindrical wall of the chamber and said supporting wall when said sleeve is in its first position, and said piston head having annular grooves formed in said side wall to form a labyrinth seal between said piston head and the cylindrical wall of the chamber.
Claim 3
Dependent Claim
56 words
A contact-free piston arrangement, as claimed in claim 1, further comprising: sealing means at the bottom of the chamber abutting said sleeve to form an enclosed chamber between said sealing means and said bushing means; and means to circulate a lubricating and cooling agent through said enclosed chamber between said sealing means and said bushing means.
Claim 4
Dependent Claim
18 words
A contact-free piston arrangement, as claimed in claim 1, wherein said bushing means comprises axially spaced plain bearings.
Claim 5
Dependent Claim
17 words
A contact-free piston arrangement, as claimed in claim 3, wherein said Plain bearings are hydrodynamic plain bearings.
Claim 6
Dependent Claim
60 words
A contact-free piston arrangement, as claimed in claim 1, wherein the annular grooves formed in the side wall of said piston head vary in width and depth so that the grooves at the upper portion of the side wall are narrower and shallower and the grooves at the lower portion of the side wall of said piston head are wider.
Claim 7
Dependent Claim
44 words
A contact-free piston arrangement, as claimed in claim 3, wherein said plain bearings are mounted on slotted conical rings, and tension screw means are provided causing said plain bearings to be radially biased by axial displacement of said rings by said tension screw means.
Claim 8
Dependent Claim
81 words
A contact-free piston arrangment, as claimed in claim 6, wherein said plain bearings comprise: a plurality of sliding members uniformly distributed about the circumference of said sleeve, said sliding members comprising: an outer piece having a point like projection bearing on an associated ring; an inner piece; rollers mounted between said inner and outer pieces; a plastic layer affixed to the inner piece; and a white metal sheet affixed to said plastic layer, said white metal sheet slidably contacting said sleeve.
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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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |