Patent US4461595A successfully refreshed from Google Patents.
US4461595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wrist pin for reciprocating engines
Assignee: Individual
•
Filing: 1982-09-29
•
Granted: 1984-07-24
•
Expires: 2002-09-29
Abstract
Abstract A wrist pin for coupling a connecting rod to a piston in an engine is disclosed. The pin takes the form of a metal tube having a specially designed aperture with an increased surface area in comparison with conventional wrist pins having bores with circular cross section. In the preferred embodiment, the internal aperture is defined by alternately connected convex and concave surface portions.
Inventors
- 👤 Angelos Mallas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:37
CPC Classifications
F; F16; F16J; F16J1/00; F16J1/10; F16J1/14; F16J1/16; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49249; Y10T29/49266; Y10T29/49826; Y10T29/49945; Y10T403/00; Y10T403/32; Y10T403/32606; Y10T403/32861; Y10T403/32893; Y10T74/00; Y10T74/21; Y10T74/2142; Y10T74/2162
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
102 words
In an assembly for use in a reciprocating engine, the improvement comprising: a piston; a connecting rod having an upper portion with an opening extending therethrough; and a wrist pin passing through the opening in the connecting rod and coupled to the piston, said wrist pin being defined by a tube having an outer surface dimensioned to as to substantially correspond in size to the opening in the connecting rod, said tube including a single, generally concentric, inner aperture extending throughout the longitudinal length of the tube, said aperture having an irregularly shaped cross-section defined by alternately connected convex and concave portions.
Claim 2
Dependent Claim
102 words
In an assembly for use in a reciprocating engine, the improvement comprising: a piston; a connecting rod having an upper portion with an opening extending therethrough; and a wrist pin passing through the opening in the connecting rod and coupled to the piston, said wrist pin being defined by a tube having an outer surface dimensioned to as to substantially correspond in size to the opening in the connecting rod, said tube including a single, generally concentric, inner aperture extending throughout the longitudinal length of the tube, said aperture having an irregularly shaped cross-section defined by alternately connected convex and concave portions.
Claim 3
Dependent Claim
27 words
The improvement of claim 1 wherein there are an equal number of convex and concave portions, with said convex portions being located diametrically opposite said concave portions.
Claim 4
Dependent Claim
141 words
In an assembly for a reciprocating engine, the improvement comprising: a piston; a connecting rod having an upper portion with an opening therein, and a wrist pin passing through the opening in the connecting rod and having ends thereof coupled to spaced locations, said wrist pin being defined by an integral metal tube having an outer surface with a diameter essentially the same size as the opening in the connecting rod, said tube including a single, concentric inner aperture extending longitudinally throughout the length of the tube, said aperture having an irregular-shaped cross-section defined by an equal number of alternately connected convex and concave portions having smooth transitions therebetween, said convex portions being located within the tube so that they are diametrically opposite said concave portions thereby providing wall regions of varying thicknesses, with thicker wall regions opposing thinner wall regions.
Claim 5
Dependent Claim
141 words
In an assembly for a reciprocating engine, the improvement comprising: a piston; a connecting rod having an upper portion with an opening therein, and a wrist pin passing through the opening in the connecting rod and having ends thereof coupled to spaced locations, said wrist pin being defined by an integral metal tube having an outer surface with a diameter essentially the same size as the opening in the connecting rod, said tube including a single, concentric inner aperture extending longitudinally throughout the length of the tube, said aperture having an irregular-shaped cross-section defined by an equal number of alternately connected convex and concave portions having smooth transitions therebetween, said convex portions being located within the tube so that they are diametrically opposite said concave portions thereby providing wall regions of varying thicknesses, with thicker wall regions opposing thinner wall regions.
Claim 6
Dependent Claim
18 words
The improvement of claim 3 where the ends of the tube are connected to the piston by snap-rings.
Claim 7
Dependent Claim
15 words
The improvement of claim 3 wherein there are seven convex portions and seven concave portions.
References Cited (Backward Citations)
GB189317633A
Cited
US1157666A
Cited
US1330316A
Cited
FR531002A
Cited
US1859360A
Cited
US3053595A
Cited
US3479929A
Cited
US3702092A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-24 | 1988-01-23 | 1988-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-24 | 1992-01-23 | 1992-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-24 | 1996-01-23 | 1996-07-24 | $7700.00 | Window Closed / Lapsed |