Patent US4079951A successfully refreshed from Google Patents.
US4079951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal piston with annular flanges having synthetic overlay and annular seal
Assignee: Scott Technologies Inc
•
Filing: 1977-03-10
•
Granted: 1978-03-21
•
Expires: 1997-03-10
Abstract
Abstract A piston and cylinder device wherein the piston comprises an annular metal core with a peripheral groove for receiving an annular seal. The metal core has a peripheral overlay of nylon which provides a bearing surface at each side of the peripheral groove and the overlay follows the contour of the periphery of the metal core including the walls of the peripheral seal receiving groove.
Inventors
- 👤 Ward Sievenpiper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:48
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/06; F16J15/00; F16J15/16; F16J15/32
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
97 words
A piston assembly for axial movement in a cylinder, said assembly comprising an annular metal core having a pair of axially spaced radially-extending annular flanges at the exterior periphery thereof, an overlay of synthetic resin material extending over the surface portions of said flanges whereby the portions of said overlay at the peripheries of said flanges provide bearing means for supporting said piston in said cylinder, and an annular seal disposed in the axial space between the overlay material at the facing radial surfaces of said flanges and adapted to engage said cylinder wall in sealing relationship.
Claim 2
Dependent Claim
97 words
A piston assembly for axial movement in a cylinder, said assembly comprising an annular metal core having a pair of axially spaced radially-extending annular flanges at the exterior periphery thereof, an overlay of synthetic resin material extending over the surface portions of said flanges whereby the portions of said overlay at the peripheries of said flanges provide bearing means for supporting said piston in said cylinder, and an annular seal disposed in the axial space between the overlay material at the facing radial surfaces of said flanges and adapted to engage said cylinder wall in sealing relationship.
Claim 3
Dependent Claim
42 words
A piston assembly according to claim 1 wherein said synthetic overlay extends continuously about the interior annular space between said flanges whereby said annular seal means seats thereagainst at the inner diameter of said seal means and at the end faces thereof.
Claim 4
Dependent Claim
34 words
A piston assembly according to claim 1 wherein said seal means comprises an annular outer member of relatively non-deformable material and an inner annular expansion member bearing radially outwardly against said annular outer member.
Claim 5
Dependent Claim
34 words
A piston assembly according to claim 2 wherein said seal means comprises an annular outer member of relatively non-deformable material and an inner annular expansion member bearing radially outwardly against said annular outer member.
Claim 6
Dependent Claim
20 words
A piston assembly according to claim 1 wherein said overlay comprises nylon or synthetic material having substantially equivalent physical properties.
Claim 7
Dependent Claim
20 words
A piston assembly according to claim 2 wherein said overlay comprises nylon or synthetic material having substantially equivalent physical properties.
Claim 8
Dependent Claim
33 words
A piston assembly according to claim 1 wherein said flanges have openings in radial faces thereof with said synthetic resin material extending into said openings to lock said overlay to said metal core.
Claim 9
Dependent Claim
33 words
A piston assembly according to claim 2 wherein said flanges have openings in radial faces thereof with said synthetic resin material extending into said openings to lock said overlay to said metal core.
Claim 10
Dependent Claim
27 words
A piston assembly according to claim 1 wherein said seal means extends radially inwardly between said metal core flanges to be supported therebetween in an axial direction.
Claim 11
Dependent Claim
27 words
A piston assembly according to claim 2 wherein said seal means extends radially inwardly between said metal core flanges to be supported therebetween in an axial direction.
Claim 12
Dependent Claim
72 words
A piston assembly according to claim 1 including a piston rod extending axially through said annular metal core, said piston rod having a radial face bearing directly against one radial face of said metal core and a threaded end portion, and nut means engaging said threaded piston rod end portion and bearing directly against the other radial face of said metal core to provide an axially rigid piston and piston rod assembly.
Claim 13
Dependent Claim
72 words
A piston assembly according to claim 2 including a piston rod extending axially through said annular metal core, said piston rod having a radial face bearing directly against one radial face of said metal core and a threaded end portion, and nut means engaging said threaded piston rod end portion and bearing directly against the other radial face of said metal core to provide an axially rigid piston and piston rod assembly.
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) | 1981-03-20 | 1981-09-19 | 1982-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-20 | 1985-09-19 | 1986-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-20 | 1989-09-19 | 1990-03-21 | $7700.00 | Window Closed / Lapsed |