Patent US3987709A successfully refreshed from Google Patents.
US3987709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston
Assignee: Individual
•
Filing: 1975-04-07
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Granted: 1976-10-26
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Expires: 1995-04-07
Abstract
Abstract A piston comprising a head, a pair of opposed boss-carrying elements depending from the head and a pair of opposed skirt portions separated from each other and from the head. The skirt sections are supported from the boss-carrying elements by upper and lower pairs of struts each joined at one end to an adjacent skirt section and at the other end to an adjacent boss-carrying element. The end portions of each strut of the lower pair form an angle of between about 90° and 180°. The end portions of each strut of the upper pair form a substantially smaller angle than the end portions of the struts of the lower pair. The lower struts are stiffer than the upper struts.
Inventors
- 👤 Ray E. Day
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:01
CPC Classifications
F; F16; F16J; F16J1/00; F16J1/04; F02; F02F; F02F3/00; F02F3/02; F02F3/027
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
307 words
A one piece piston formed from a single material comprising a head, a pair of opposed boss-carrying supports depending from two opposite sides of said head, a pair of opposed skirt sections beneath said head at the remaining two opposite sides thereof and separated from each other and from said head, and strut means supporting said skirt sections from said supports, said strut means comprising a first upper pair of struts each joined at one end to the upper end of one skirt section and at the opposite end to the adjacent support, a second upper pair of struts each joined at one end to the upper end of the other skirt section and at the opposite end to the adjacent support, said first and second upper pairs of struts slanting downwardly from the skirt section to the support, a first lower pair of struts each joined at one end to the lower end of said one skirt section and at the opposite end to the adjacent support, a second lower pair of struts each joined at one end to the lower end of said other skirt section and at the opposite end to the adjacent support, said first and second lower pairs of struts slanting upwardly from the skirt section to the support, the struts of said first and second upper pairs being bent to an acute angle opening radially outwardly so as to be flexible and thus to flexibly support the upper end of said skirt sections from said boss-carrying supports, and the struts of said first and second lower pairs being bent to an angle of 90° or more opening radially outwardly so as to be less flexible than the struts of said first and second upper pairs and to less flexibly support the lower ends of said skirt sections from said boss-carrying supports.
Claim 2
Dependent Claim
307 words
A one piece piston formed from a single material comprising a head, a pair of opposed boss-carrying supports depending from two opposite sides of said head, a pair of opposed skirt sections beneath said head at the remaining two opposite sides thereof and separated from each other and from said head, and strut means supporting said skirt sections from said supports, said strut means comprising a first upper pair of struts each joined at one end to the upper end of one skirt section and at the opposite end to the adjacent support, a second upper pair of struts each joined at one end to the upper end of the other skirt section and at the opposite end to the adjacent support, said first and second upper pairs of struts slanting downwardly from the skirt section to the support, a first lower pair of struts each joined at one end to the lower end of said one skirt section and at the opposite end to the adjacent support, a second lower pair of struts each joined at one end to the lower end of said other skirt section and at the opposite end to the adjacent support, said first and second lower pairs of struts slanting upwardly from the skirt section to the support, the struts of said first and second upper pairs being bent to an acute angle opening radially outwardly so as to be flexible and thus to flexibly support the upper end of said skirt sections from said boss-carrying supports, and the struts of said first and second lower pairs being bent to an angle of 90° or more opening radially outwardly so as to be less flexible than the struts of said first and second upper pairs and to less flexibly support the lower ends of said skirt sections from said boss-carrying supports.
Claim 3
Dependent Claim
43 words
The piston defined in claim 1, wherein the struts of said first and second upper pairs are bent to an angle of about 30° and the struts of said first and second lower pairs are bent to an angle of about 90° .
Claim 4
Dependent Claim
43 words
The piston defined in claim 1, wherein the struts of said first and second upper pairs are bent to an angle of about 30° and the struts of said first and second lower pairs are disposed at an angle of about 180° .
References Cited (Backward Citations)
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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) | 1979-10-26 | 1980-04-26 | 1980-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-26 | 1984-04-26 | 1984-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-26 | 1988-04-26 | 1988-10-26 | $7700.00 | Window Closed / Lapsed |