US3917290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Assembly comprising a piston groove, a piston ring and an inertia ring sliding in a cylinder
Assignee: Individual
•
Filing: 1973-11-28
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Granted: 1975-11-04
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Expires: 1993-11-28
Abstract
Abstract The invention relates, in a machine cylinder in which a piston is moved with an alternating motion, to an assembly including on said piston a groove and a ring which assembly reduces the disadvantages of the de-phasing between the axial movements of the piston and those of its ring, by arranging at least one inertia ring in the piston ring groove, between one face of the groove and the piston ring, the said inertia ring sliding axially on the piston in a fluid-tight manner within the limits of the clearance between the piston ring, the inertia ring and the groove.
Inventors
- 👤 Robert Geffroy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:31
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/12; F16J9/20; F16J9/206; F16J9/203; F05; F05C; F05C2225/00; F05C2225/04; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/944; Y10S277/945; Y10S277/946
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
145 words
An assembly comprising a cylinder, a piston, an axially floating piston ring and at least one axially floating inertia ring, in which the piston is moved with an alternating motion, said piston comprising a groove having side flanks and an internal face, said piston ring in said groove having an external face engaging said cylinder, an internal face with clearance relative to the internal face of said groove and side faces, said inertia ring arranged in said groove between one side face of said piston ring and the adjacent flank of said groove, said rings having a combined axial clearance in said groove relative to the entire surfaces of said side faces, said inertia ring including means for sliding in a fluid tight manner on the internal face of said groove within limits of clearance between said piston ring, said inertia ring and said groove.
Claim 2
Dependent Claim
145 words
An assembly comprising a cylinder, a piston, an axially floating piston ring and at least one axially floating inertia ring, in which the piston is moved with an alternating motion, said piston comprising a groove having side flanks and an internal face, said piston ring in said groove having an external face engaging said cylinder, an internal face with clearance relative to the internal face of said groove and side faces, said inertia ring arranged in said groove between one side face of said piston ring and the adjacent flank of said groove, said rings having a combined axial clearance in said groove relative to the entire surfaces of said side faces, said inertia ring including means for sliding in a fluid tight manner on the internal face of said groove within limits of clearance between said piston ring, said inertia ring and said groove.
Claim 3
Dependent Claim
89 words
An assembly as claimed in claim 1, in which said inertia ring is of metal, is provided with adjacent ends and is subjected to an elastic pre-tension closing said ends, the sliding and fluid-tightness of said inertia ring on said piston being ensured by the contact of the internal face of said inertia ring with the internal face of said piston groove, said contact being maintained by said elastic pretension and said ends being adjusted so as to give, under all working conditions, a positive but very small clearance.
Claim 4
Dependent Claim
42 words
An assembly as claimed in claim 1, in which the sliding movement and fluid-tightness of said inertia ring on said piston are ensured by the interposition of a sealing means between said inertia ring and the internal face of said piston groove.
Claim 5
Dependent Claim
55 words
An assembly as claimed in claim 1, in which said inertia ring is made of an elastic material such as a fluorinated elastomer of which a production is known by the name of Viton, and is mounted by expansion on said piston and ensures fluid-tightness of its internal face against said piston by elastic pressure.
Claim 6
Dependent Claim
62 words
An assembly as claimed in claim 1, in which said inertia ring is made of a plastic material such as polytetrafluoroethylene known by the name of Teflon and has spaced ends with clearance necessary to accommodate the thermal expansion of said material, and supplemental elastic means to effect the clamping of said inertia ring against the internal groove face of said piston.
Claim 7
Dependent Claim
50 words
An assembly as claimed in claim 1, in which said inertia ring has, over at least part of its height, an external diameter sufficiently distant from the wall of said cylinder, in order to constitute an annular oil reserve volume between said inertia ring and the wall of said cylinder.
Claim 8
Dependent Claim
49 words
An assembly as claimed in claim 1, in which said piston ring is a compression ring in which a seal of deformable material partially occupies the clearance space between said ring and the internal face of said groove, and is adapted to move axially under the effects of inertia.
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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |