US3814073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recoil engine starter
Assignee: Yamaha Motor Co Ltd
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Filing: 1972-08-15
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Granted: 1974-06-04
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Expires: 1992-08-15
Abstract
Abstract A recoil engine starter comprising a sheave to operate a crankshaft of an internal combustion engine by drawing a starting rope wound upon the sheave, a spring biasing the sheave in a rope recoiling direction, and a ratchet-and-pawl mechanism selectively transmitting the rotation torque of the sheave to the crankshaft. The sheave comprises a rope winding portion formed in a regular polygonal shape and the ratchet-and-pawl mechanism includes an engaging device to engage the sheave with the crankshaft at a plurality of engaging positions corresponding to the number of apexes of the polygonal shape.
Inventors
- 👤 T Nakatani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:47
CPC Classifications
F; F02; F02N; F02N3/00; F02N3/02; F02B; F02B61/00; F02B61/04; F02B61/045
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
192 words
In a recoil engine starter comprising a sheave to operate a crankshaft of an internal combustion engine by drawing a starting rope wound upon said sheave, a spring biasing said sheave in a rope recoiling direction, and a ratchet-and-pawl mechanism selectively transmitting the rotation torque of said sheave to said crankshaft, the improvement wherein said sheave comprises a rope winding portion formed in a regular polygonal shape and said ratchet-and-pawl mechanism includes means for engaging said sheave with said crankshaft at a plurality of engaging positions corresponding to a number of apexes of said polygonal shape, one of imaginary lines connecting the axial center of said sheave and one of the apexes of said polygonal shape crossing substantially at a right angle against the rope pulling direction just before the arrival of the piston of said engine at its top dead center in the compression stroke, wherein said sheave comprises a pair of disc plates rotatably assembled within a starter housing and a plurality of winding pins for connecting said disc plates to be in parallel to each other, said winding pins being arranged to form said regular polygonal rope winding portion.
Claim 2
Dependent Claim
192 words
In a recoil engine starter comprising a sheave to operate a crankshaft of an internal combustion engine by drawing a starting rope wound upon said sheave, a spring biasing said sheave in a rope recoiling direction, and a ratchet-and-pawl mechanism selectively transmitting the rotation torque of said sheave to said crankshaft, the improvement wherein said sheave comprises a rope winding portion formed in a regular polygonal shape and said ratchet-and-pawl mechanism includes means for engaging said sheave with said crankshaft at a plurality of engaging positions corresponding to a number of apexes of said polygonal shape, one of imaginary lines connecting the axial center of said sheave and one of the apexes of said polygonal shape crossing substantially at a right angle against the rope pulling direction just before the arrival of the piston of said engine at its top dead center in the compression stroke, wherein said sheave comprises a pair of disc plates rotatably assembled within a starter housing and a plurality of winding pins for connecting said disc plates to be in parallel to each other, said winding pins being arranged to form said regular polygonal rope winding portion.
Claim 3
Dependent Claim
78 words
A recoil engine starter as set forth in claim 1, wherein said rope winding pins are three winding pins arranged to correspond respectively with three apexes of a regular triangle, an imaginary line between the axial center of said sheave and any one of said three winding pins crossing substantially at a right angle to the rope pulling direction just before the arrival of the piston of said engine at its top dead center in the compression stroke.
Claim 4
Dependent Claim
78 words
A recoil engine starter as set forth in claim 1, wherein said rope winding pins are four winding pins arranged to correspond respectively with four apexes of a regular square, an imaginary line between the axial center of said Sheave and any one of said four winding pins crossing substantially at a right angle to the rope pulling direction just before the arrival of the piston of said engine at its top dead center in the compression stroke.
Claim 5
Dependent Claim
40 words
A recoil engine starter as set forth in claim 1, wherein said sheave further comprises a plurality of rollars respectively journalled on said winding pins between said disc plates, said starting rope being wound upon the periphery of said rollars.
Claim 6
Dependent Claim
39 words
A recoil engine starter as set forth in claim 3, wherein said sheave further comprises four rollars respectively journalled on said four winding pins between said disc plates, said starting rope being wound upon the periphery of said rollars.
References Cited (Backward Citations)
US2942599A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |