US4300776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing assembly for two relatively movable machine parts
Assignee: Mannesmann Demag Krauss Maffei GmbH
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Filing: 1980-11-25
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Granted: 1981-11-17
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Expires: 2000-11-25
Abstract
Abstract A packing for a piston-and-cylinder arrangement, especially for a dosing or metering unit for highly-filled reactive synthetic resin components such as a polyol or isocyanate, e.g. for producing polyurethanes, comprises a stack of yieldable rings of V-section with one member at an end of the stack bearing with a planar surface against a planar shoulder of the piston and the ring at the opposite end of the stack engaging a spring ring of V-section which confronts an abutment of the piston. According to the invention, the angle α between the two shanks of the V of the spring ring, in its unstressed state, is greater than the angle γ between the flanks of the packing ring at this end of the stack which define the V of this packing ring. The arrangement is such that under stress the angle α can be reduced to a value less than the angle γ.
Inventors
- 👤 Peter Taubenmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:30
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/18; F16J15/184; F16J15/185; F16J15/186; B; B29; B29B; B29B7/00; B29B7/30; B29B7/58; B29B7/60; B29B7/603; F04; F04B; F04B53/00; F04B53/14; F04B53/143; F16J15/164; F16J15/56
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
166 words
A packing assembly for sealing two relatively movable machine elements against one another as a first of said elements moves toward a fluid compartment under pressure in a forward direction and can be retracted in an opposite direction, said packing assembly comprising: an abutment formed on one of said elements remote from said compartment; a stack of packing members braced at one end against said abutment and having V-section portions turned toward said compartment and defined by flanks diverging at angle γ; a spring element of V-shaped cross section engaging the flank of a member of said stack proximal to said compartment and having a flank angle α; and a counter-surface supporting said spring element against said stack, said angle α being greater than the angle γ in a relaxed condition of said spring element and said counter-surface being shaped to permit deflection of flanks of said spring element to reduce the flank angle thereof to a value less than γ upon stressing of said stack.
Claim 2
Dependent Claim
166 words
A packing assembly for sealing two relatively movable machine elements against one another as a first of said elements moves toward a fluid compartment under pressure in a forward direction and can be retracted in an opposite direction, said packing assembly comprising: an abutment formed on one of said elements remote from said compartment; a stack of packing members braced at one end against said abutment and having V-section portions turned toward said compartment and defined by flanks diverging at angle γ; a spring element of V-shaped cross section engaging the flank of a member of said stack proximal to said compartment and having a flank angle α; and a counter-surface supporting said spring element against said stack, said angle α being greater than the angle γ in a relaxed condition of said spring element and said counter-surface being shaped to permit deflection of flanks of said spring element to reduce the flank angle thereof to a value less than γ upon stressing of said stack.
Claim 3
Dependent Claim
112 words
The packing assembly defined in claim 1 wherein said one of said elements is a piston and the other of said elements is a cylinder receiving said piston (and preferably forming a metering pump for a highly-filled reactive synthetic resin component therewith), said piston being formed with an outwardly open annular compartment receiving said stack and having a first annular shoulder forming said abutment, a second annular shoulder supporting said counter-surface and means for axially displacing one of said shoulders toward the other of said shoulders to stress said stack against said spring element and said counter-surface, said members forming packing rings, said spring element forming a spring ring encircling said piston.
Claim 4
Dependent Claim
47 words
The packing assembly defined in claim 2 wherein said counter-surface is formed by a support ring braced against said second shoulder and having a V-shaped crest engaging said spring element and formed with a flank angle β, said flank angle β being smaller than the angle γ.
Claim 5
Dependent Claim
24 words
The packing assembly defined in claim 3 wherein said support ring is formed adjacent said second shoulder with a plurality of radially extending passages.
Claim 6
Dependent Claim
22 words
The packing assembly defined in claim 3 wherein the angle α is about 120° in the relieved condition of said spring ring.
Claim 7
Dependent Claim
26 words
The packing assembly defined in claim 3 wherein said spring ring is formed with internal and external generally cylindrical flanges along inner and outer rims thereof.
Claim 8
Dependent Claim
27 words
The packing assembly defined in claim 2, claim 3, claim 5 or claim 6 wherein a V-section metal spring ring is provided between two of said members.
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) | 1984-11-16 | 1985-05-18 | 1985-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-16 | 1989-05-18 | 1989-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-16 | 1993-05-18 | 1993-11-17 | $7700.00 | Window Closed / Lapsed |