US3716039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hand-starting auxiliary device for internal combustion engines
Assignee: Individual
•
Filing: 1971-11-10
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Granted: 1973-02-13
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Expires: 1991-11-10
Abstract
Abstract An auxiliary device that is attached to the crankshaft of a hand-started internal combustion engine, comprising a beehiveshaped body having a base, adjacent to the engine, and a spiral groove therearound that terminates in a notch at the apex thereof within four full turns. The initial groove at the base comprises a double groove. Substantial inward progression of the groove toward the axis of the body approximately coincides with the initiation of firing by the engine, whereby high power input is sustained until firing commences, and rotational speed is increased thereafter.
Inventors
- 👤 D Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:36
CPC Classifications
F; F02; F02N; F02N3/00; F02N3/02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; Y; Y10; Y10T; Y10T74/00; Y10T74/13
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
65 words
A manual starting device for an internal combustion engine attached to the crankshaft of said engine, comprising a beehiveshaped body having a spiral groove of sufficient width to accomodate a pull rope, said groove having an initial double width along a portion of its length at the base of said body and terminating in a pull notch at the apex thereof within four full turns.
Claim 2
Dependent Claim
65 words
A manual starting device for an internal combustion engine attached to the crankshaft of said engine, comprising a beehiveshaped body having a spiral groove of sufficient width to accomodate a pull rope, said groove having an initial double width along a portion of its length at the base of said body and terminating in a pull notch at the apex thereof within four full turns.
Claim 3
Dependent Claim
65 words
A manual starting device for an internal combustion engine attached to the crankshaft of said engine, comprising a beehive-shaped body having a spiral groove of sufficient width to accomodate a pull rope, said groove having an initial double width along a portion of its length at the base of said body and terminating in a pull notch at the apex thereof within four full turns.
Claim 4
Dependent Claim
65 words
A manual starting device for an internal combustion engine attached to the crankshaft of said engine, comprising a beehive-shaped body having a spiral groove of sufficient width to accomodate a pull rope, said groove having an initial double width along a portion of its length at the base of said body and terminating in a pull notch at the apex thereof within four full turns.
Claim 5
Dependent Claim
44 words
The device of claim 1 wherein the diameter of said base is 6.2 inches and the cumulative circumference, C, of said spiral groove, as measured by the length of wound pull rope thereupon, is given in inches per turn, T, as: C 20.0 T0.90
Claim 6
Dependent Claim
30 words
The device of claim 1 wherein said engine has a pulley thereon and said body is attached to said crankshaft by superimposing said body over the hub of said pulley.
Claim 7
Dependent Claim
66 words
The device of claim 3 wherein said body has a central well which is open on the apex end of said body and an annular slot that is open on the base side of said body, said well having a base that is flush with said base and sides which form the sides of said slot, said base having a central opening that fits said crankshaft.
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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |