US5009124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wrist pin
Assignee: AE PLC
•
Filing: 1990-02-27
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Granted: 1991-04-23
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Expires: 2010-02-27
Abstract
Abstract Wrist pins for use in pistons are described. The wrist pin comprises an elongate, substantially hollow member having two spaced-apart convex surface portions of substantially cylindrical or oval curvature, the two convex portions being connected by two walls of different curvature. Because the connecting walls are more nearly in compression and bending loads are minimised a lighter wrist pin for a given application may be produced.
Inventors
- 👤 Olivier Beaurepaire
- 👤 Frederick H. Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:18
CPC Classifications
F; F16; F16J; F16J7/00; F16J1/00; F16J1/10; F16J1/14; F16J1/16; F05; F05C; F05C2201/00; F05C2201/04; F05C2201/0433; F05C2201/0448; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32606; Y10T403/32861; Y10T74/00; Y10T74/21; Y10T74/2142; Y10T74/2162; Y10T74/2173
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
67 words
A wrist pin comprising an elongate, substantially hollow member having two spaced-apart convex portions each having a substantially cylindrical outer form and which co-operate with corresponding surfaces in wrist pin bosses of an associated piston and in the small end of an associated connecting rod wherein said convex portions are connected by walls of greater radius of curvature than the radius of curvature of said convex portions.
Claim 2
Dependent Claim
67 words
A wrist pin comprising an elongate, substantially hollow member having two spaced-apart convex portions each having a substantially cylindrical outer form and which co-operate with corresponding surfaces in wrist pin bosses of an associated piston and in the small end of an associated connecting rod wherein said convex portions are connected by walls of greater radius of curvature than the radius of curvature of said convex portions.
Claim 3
Dependent Claim
14 words
A wrist pin according to claim 1 wherein said walls are of concave section.
Claim 4
Dependent Claim
15 words
A wrist pin according to claim 1 wherein said walls are of substantially planar form.
Claim 5
Dependent Claim
18 words
A wrist pin according to claim 1 wherein said walls are of thinner section than said convex portions.
Claim 6
Dependent Claim
27 words
A wrist pin according to claim 1 wherein at the junctions of said convex portions and said walls the intersecting inner surfaces thereof have a blending radius.
Claim 7
Dependent Claim
27 words
A wrist pin according to claim 1 wherein at the junctions of said convex portions and said walls the intersecting outer surfaces thereof have a blending radius.
Claim 8
Dependent Claim
16 words
A wrist pin according to claim 1 wherein said two convex portions have different surface areas.
Claim 9
Dependent Claim
16 words
A wrist pin according to claim 1 wherein said convex portions have a non-uniform section thickness.
Claim 10
Dependent Claim
23 words
A wrist pin according to claim 8 wherein said section thickness is at a maximum about a plane which bisects said convex portions.
Claim 11
Dependent Claim
27 words
A wrist pin according to claim 9 wherein said section thickness is at a minimum adjacent the region of intersection of said convex portions and said walls.
Claim 12
Dependent Claim
61 words
A wrist pin comprising an elongate, substantially hollow member having two spaced apart convex portions and which co-operate with corresponding surfaces in the wrist pin bosses of an associated piston and in the small end of an associated connecting rod wherein said convex portions have an oval outer profile and are connected by walls of less curvature than the convex portions.
Claim 13
Dependent Claim
61 words
A wrist pin comprising an elongate, substantially hollow member having two spaced apart convex portions and which co-operate with corresponding surfaces in the wrist pin bosses of an associated piston and in the small end of an associated connecting rod wherein said convex portions have an oval outer profile and are connected by walls of less curvature than the convex portions.
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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) | 1994-04-22 | 1994-10-22 | 1995-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-22 | 1998-10-22 | 1999-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-22 | 2002-10-22 | 2003-04-23 | $7700.00 | Window Closed / Lapsed |