US4852708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring shield for starter drives for internal combustion engines
Assignee: Individual
•
Filing: 1988-03-24
•
Granted: 1989-08-01
•
Expires: 2008-03-24
Abstract
Abstract A small metal shield is disclosed which lengthens the life of the rectangular springs in starter drives for internal combustion engines. The shield has a rectangular face which slightly overlaps the edges of the spring and a projection which seats the shield in the spring between the end of the spring and the cylindrical roller. The projection may be perpendicular to the face or at a slight angle from the perpendicular.
Inventors
- 👤 Charles Parkhurst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:44
CPC Classifications
F; F16; F16D; F16D41/00; F16D41/06; F16D41/064; F16D41/066; F02; F02N; F02N15/00; F02N15/02; F02N15/022; F02N15/023; F16D2041/0605; Y; Y10; Y10T; Y10T74/00; Y10T74/13; Y10T74/131; Y10T74/134
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
151 words
In a starter drive for internal combustion engines said starter drive having an overrunning clutch comprising a driving member concentric with and around a driven, member said driven member having a cylindrical outer surface, a plurality of cylindrical rollers housed within recesses formed in said driving member, each roller being biassed by a rectangular coil spring, the improvement comprising a shield of durable material positioned between the end of said spring and a surface of said roller wherein said shield comprises: (a) a rectangular face having dimensions greater than or equal to the rectangular cross-sectional shape of said spring, and comprising a durable material no harder than said roller; and (b) a projection connected to said face and received in a central opening of one end of said spring and having a length less than the length of said spring when said spring is in its state of maximum operating compression.
Claim 2
Dependent Claim
151 words
In a starter drive for internal combustion engines said starter drive having an overrunning clutch comprising a driving member concentric with and around a driven, member said driven member having a cylindrical outer surface, a plurality of cylindrical rollers housed within recesses formed in said driving member, each roller being biassed by a rectangular coil spring, the improvement comprising a shield of durable material positioned between the end of said spring and a surface of said roller wherein said shield comprises: (a) a rectangular face having dimensions greater than or equal to the rectangular cross-sectional shape of said spring, and comprising a durable material no harder than said roller; and (b) a projection connected to said face and received in a central opening of one end of said spring and having a length less than the length of said spring when said spring is in its state of maximum operating compression.
Claim 3
Dependent Claim
12 words
The improvement of claim 1 wherein said shield is made of copper.
Claim 4
Dependent Claim
15 words
The improvement of claim 1 wherein said projection connects to said face at right angles.
Claim 5
Dependent Claim
19 words
The improvement of claim 1 wherein said projection connects to said face at an angle slightly beyond the perpendicular.
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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) | 1992-07-31 | 1993-01-30 | 1993-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-31 | 1997-01-30 | 1997-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-31 | 2001-01-30 | 2001-08-01 | $7700.00 | Window Closed / Lapsed |