US4285305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Keyed adapter sleeve
Assignee: Tecumseh Products Co
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Filing: 1979-11-16
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Granted: 1981-08-25
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Expires: 1999-11-16
Abstract
Abstract An ignition timing method and apparatus is disclosed for presetting the ignition timing of an internal combustion engine having an engine driven shaft and a wheel supported on that shaft carrying a portion of the ignition system with another portion of that ignition system supported by the engine in a relatively fixed position adjacent the wheel. A slot is provided in the shaft surface extending generally in the direction of the axis of rotation of the shaft and a further slot is provided along an inner hub of the wheel. A selected one of several different keys including spacer keys of a generally frustoconical configuration having an outer protuberance for engaging a keyway in the wheel hub and an inner protuberance for engaging a keyway in the shaft is selected and positioned intermediate the shaft and hub to fix the relative angular orientation between the shaft and hub with those keys of the frustoconical sleeve configuration compensating for the dissimilarity in the size between the hub and shaft. The spacing between the inner and outer protuberances on the frustoconical sleeve determines a selected one of the different possible angular orientations while a non-spacing key having a selected offset determines the particular angular orientation between the wheel hub and a mating shaft.
Inventors
- 👤 Vernon R. Kaufman
- 👤 Eugene L. Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:22
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/05; F16; F16D; F16D1/00; F16D1/06; F16D1/08; F16D1/0876; Y; Y10; Y10T; Y10T403/00; Y10T403/70; Y10T403/7018; Y10T403/7021; Y10T74/00; Y10T74/19; Y10T74/1987; Y10T74/19893; Y10T74/19898
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
169 words
An arrangement for adapting a standardized wheel and included portion of an ignition system to any of a number of different ignition systems and their associated different timing requirements on any of a number of different internal combustion engines including at least two different size engine driven shafts having tapered surface portions for rotatably supporting the standardized wheel wherein the standardized wheel has a wheel hub integral therewith having a tapered central opening matable with a larger of the two shaft tapered surface portions, and the shaft tapered surfaces and the wheel hub tapered central opening each contain a keyway, comprising a generally frustoconical sleeve having an outer surface matable with the wheel hub central opening and an inner surface matable with a smaller of the two shaft tapered surface portions and having an outer protuberance for engaging the wheel hub keyway and an inner protuberance for engaging the shaft keyway with the spacing between the inner and outer protuberances selected to provide a desired engine ignition timing setting.
Claim 2
Dependent Claim
169 words
An arrangement for adapting a standardized wheel and included portion of an ignition system to any of a number of different ignition systems and their associated different timing requirements on any of a number of different internal combustion engines including at least two different size engine driven shafts having tapered surface portions for rotatably supporting the standardized wheel wherein the standardized wheel has a wheel hub integral therewith having a tapered central opening matable with a larger of the two shaft tapered surface portions, and the shaft tapered surfaces and the wheel hub tapered central opening each contain a keyway, comprising a generally frustoconical sleeve having an outer surface matable with the wheel hub central opening and an inner surface matable with a smaller of the two shaft tapered surface portions and having an outer protuberance for engaging the wheel hub keyway and an inner protuberance for engaging the shaft keyway with the spacing between the inner and outer protuberances selected to provide a desired engine ignition timing setting.
Claim 3
Dependent Claim
19 words
The arrangement of claim 1 wherein the outer protuberance extends generally uniformly along a slant height of the sleeve.
Claim 4
Dependent Claim
28 words
The arrangement of claim 1 wherein the sleeve has a generally uniform side wall thickness for determining the spacing between the wheel hub and the shaft tapered surface.
Claim 5
Dependent Claim
42 words
The arrangement of claim 1 wherein the outer protuberance extends generally uniformly along a slant height of the sleeve and the inner protuberance comprises a pair of radially inward side wall depressions spaced along a slant height distinct from the outer protuberance.
Claim 6
Dependent Claim
27 words
The arrangement of claim 1 wherein the shaft keyway and the wheel hub keyway are each of a generally uniform depth relative to their respective tapered surface.
Claim 7
Dependent Claim
146 words
The arrangement of claim 1 wherein when a standardized wheel is mounted on an engine having a smaller shaft tapered surface portion and equipped with a magneto type ignition system, a sleeve having a first spacing between the inner and outer protuberances is positioned between the shaft tapered surface and the wheel hub tapered central opening, while, when a standardized wheel is mounted on an engine having a smaller shaft tapered surface portion and equipped with a capacitor discharge solid state type ignition system, a sleeve having a second spacing between the inner and outer protuberances different from said first spacing is positioned between the shaft tapered surface and the wheel hub tapered central opening, and when a standardized wheel is mounted on an engine having a larger shaft tapered surface portion, the wheel hub tapered central opening and shaft tapered surface are in direct contact.
Claim 8
Dependent Claim
34 words
The arrangement of claim 6 wherein the ignition system portion included as a part of the standardized wheel comprises a permanent magnet as an essential component of any one of said ignition system types.
Claim 9
Dependent Claim
29 words
The arrangement of claim 7 wherein the standardized wheel is constructed primarily of a non-magnetic material with the permanent magnet fastened to the wheel near the outer periphery thereof.
Claim 10
Dependent Claim
89 words
An adapter sleeve for accommodating a standardized flywheel to a number of different size shafts at a number of different angular orientations relative to each shaft and used only in conjunction with shafts smaller than the largest shaft to which the flywheel may be mounted comprising a generally frustoconical sleeve having an outer protuberance for engaging a keyway in the flywheel and an inner protuberance for engaging a keyway in a shaft, the spacing between the inner and outer protuberances determining a selected one of the different angular orientations.
Claim 11
Dependent Claim
89 words
An adapter sleeve for accommodating a standardized flywheel to a number of different size shafts at a number of different angular orientations relative to each shaft and used only in conjunction with shafts smaller than the largest shaft to which the flywheel may be mounted comprising a generally frustoconical sleeve having an outer protuberance for engaging a keyway in the flywheel and an inner protuberance for engaging a keyway in a shaft, the spacing between the inner and outer protuberances determining a selected one of the different angular orientations.
Claim 12
Dependent Claim
28 words
The adapter sleeve of claim 9 wherein the sleeve has a generally uniform side wall thickness for determining the spacing between the flywheel and a selected smaller shaft.
Claim 13
Dependent Claim
42 words
The adapter of claim 9 wherein the outer protuberance extends generally uniformly along a slant height of the sleeve and the inner protuberance comprises a pair of radially inward side wall depressions spaced along a slant height distinct from the outer protuberance.
Claim 14
Dependent Claim
34 words
The adapter of claim 11 wherein the sleeve is formed as a stamping from sheet metal stock of relatively uniform thickness which thickness determines the spacing between the flywheel and a selected smaller shaft.
Claim 15
Dependent Claim
211 words
In an internal combustion engine having an engine driven shaft with a tapered surface portion, and a shaft supported wheel for rotatably supporting a portion of the engine ignition system, an improved arrangement for coupling the shaft and wheel at a selectable relative angular orientation to determine the engine ignition timing comprising: a wheel hub integral with the wheel and having a tapered central opening; at least one keyway in the shaft tapered surface; at least one keyway in the wheel hub tapered central opening; and key means effective only when the hub and shaft are joined with their respective tapers in spaced alignment to join a hub keyway and a shaft keyway locking the wheel to the shaft in any selected one of a plurality of relative angular positions; the shaft tapered surface and the wheel hub tapered opening each including but a single keyway, the key means comprising a plurality of differing keys any one of which may join the hub keyway and the shaft keyway and each of which provides a different relative angular orientation between the wheel and the shaft with each key comprising a generally frusto-conical sleeve having an outer protuberance for engaging the wheel hub keyway and an inner protuberance for engaging the shaft keyway.
Claim 16
Dependent Claim
211 words
In an internal combustion engine having an engine driven shaft with a tapered surface portion, and a shaft supported wheel for rotatably supporting a portion of the engine ignition system, an improved arrangement for coupling the shaft and wheel at a selectable relative angular orientation to determine the engine ignition timing comprising: a wheel hub integral with the wheel and having a tapered central opening; at least one keyway in the shaft tapered surface; at least one keyway in the wheel hub tapered central opening; and key means effective only when the hub and shaft are joined with their respective tapers in spaced alignment to join a hub keyway and a shaft keyway locking the wheel to the shaft in any selected one of a plurality of relative angular positions; the shaft tapered surface and the wheel hub tapered opening each including but a single keyway, the key means comprising a plurality of differing keys any one of which may join the hub keyway and the shaft keyway and each of which provides a different relative angular orientation between the wheel and the shaft with each key comprising a generally frusto-conical sleeve having an outer protuberance for engaging the wheel hub keyway and an inner protuberance for engaging the shaft keyway.
Claim 17
Dependent Claim
17 words
The arrangement of claim 13 wherein differing keys have varying spacing between the inner and outer protuberance.
Claim 18
Dependent Claim
19 words
The arrangement of claim 13 wherein the outer protuberance extends generally uniformly along a slant height of the sleeve.
Claim 19
Dependent Claim
177 words
In an internal combustion engine having an engine driven shaft with a tapered surface portion, and a shaft supported wheel for rotatably supporting a portion of the engine ignition system, an improved arrangement for coupling the shaft and wheel at a selectable relative angular orientation to determine the engine ignition timing comprising: a wheel hub integral with the wheel and having a tapered central opening; at least one keyway in the shaft tapered surface; at least one keyway in the wheel hub tapered central opening; and key means effective only when the hub and shaft are joined with their respective tapers in spaced alignment to join a hub keyway and a shaft keyway locking the wheel to the shaft in any selected one of a plurality of relative angular positions; the key means comprising a generally frusto-conical sleeve having an outer protuberance for engaging the wheel hub keyway and an inner protuberance for engaging the shaft keyway, the spacing between the inner and outer protuberances determining the particular selected one of the plurality of relative angular positions.
Claim 20
Dependent Claim
177 words
In an internal combustion engine having an engine driven shaft with a tapered surface portion, and a shaft supported wheel for rotatably supporting a portion of the engine ignition system, an improved arrangement for coupling the shaft and wheel at a selectable relative angular orientation to determine the engine ignition timing comprising: a wheel hub integral with the wheel and having a tapered central opening; at least one keyway in the shaft tapered surface; at least one keyway in the wheel hub tapered central opening; and key means effective only when the hub and shaft are joined with their respective tapers in spaced alignment to join a hub keyway and a shaft keyway locking the wheel to the shaft in any selected one of a plurality of relative angular positions; the key means comprising a generally frusto-conical sleeve having an outer protuberance for engaging the wheel hub keyway and an inner protuberance for engaging the shaft keyway, the spacing between the inner and outer protuberances determining the particular selected one of the plurality of relative angular positions.
Claim 21
Dependent Claim
28 words
The arrangement of claim 16 wherein the sleeve has a generally uniform side wall thickness for determining the spacing between the wheel hub and the shaft tapered surface.
Claim 22
Dependent Claim
42 words
The arrangement of claim 17 wherein the outer protuberance extends generally uniformly along a slant height of the sleeve and the inner protuberance comprises a pair of radially inward side wall depressions spaced along a slant height distinct from the outer protuberance.
Claim 23
Dependent Claim
151 words
In an internal combustion engine having an engine driven shaft with a tapered surface portion, and a shaft supported wheel for rotatably supporting a portion of the engine ignition system, an improved arrangement for coupling the shaft and wheel at a selectable relative angular orientation to determine the engine ignition timing comprising: a wheel hub integral with the wheel and having a tapered central opening; at least one keyway in the shaft tapered surface; at least one keyway in the wheel hub tapered central opening, the shaft keyway and the wheel hub keyway each being of a generally uniform depth relative to their respective tapered surface; and key means effective only when the hub and shaft are joined with their respective tapers in spaced alignment to join a hub keyway and a shaft keyway locking the wheel to the shaft in any selected one of a plurality of relative angular positions.
Claim 24
Dependent Claim
151 words
In an internal combustion engine having an engine driven shaft with a tapered surface portion, and a shaft supported wheel for rotatably supporting a portion of the engine ignition system, an improved arrangement for coupling the shaft and wheel at a selectable relative angular orientation to determine the engine ignition timing comprising: a wheel hub integral with the wheel and having a tapered central opening; at least one keyway in the shaft tapered surface; at least one keyway in the wheel hub tapered central opening, the shaft keyway and the wheel hub keyway each being of a generally uniform depth relative to their respective tapered surface; and key means effective only when the hub and shaft are joined with their respective tapers in spaced alignment to join a hub keyway and a shaft keyway locking the wheel to the shaft in any selected one of a plurality of relative angular positions.
Claim 25
Independent Claim
291 words
The method of presetting the ignition timing of an internal combustion engine having a rotatable shaft and a wheel supported on the shaft for rotation therewith wherein the wheel is a standardized flywheel designed to fit a number of different engines including engines of at least two different sizes of rotatable shafts the largest of which fits the flywheel inner hub and wherein the engine ignition system includes a relatively fixed portion supported by the engine and a movable portion sup ported on the wheel for rotation therewith, the method comprising the steps of: providing a slot in the shaft surface extending generally in the direction of the axis of rotation of the shaft; providing a slot in the wheel along an inner hub thereof; selecting one of a plurality of spacer keys having differing offset amounts, the step of selecting including choosing a spacer key of the appropriate offset amount having a dimension to provide a uniform separation just sufficient to compensate for the difference in size between the largest size shaft and the particular shaft to which the wheel is to be assembled; assembling the wheel to the shaft with the selected spacer key intermediate the wheel and shaft forming a generally uniform separation therebetween by moving the larger open end of the wheel inner hub toward the smaller outer end of a tapered portion of the shaft until the selected spacer key firmly engages both the shaft and the inner hub, and with one part of the selected spacer key occupying the shaft slot and another part of the selected spacer key occupying the wheel slot to thereby fix the angular relationship between the shaft and wheel at the angular offset determined by the particular spacer key selected.
Claim 26
Independent Claim
291 words
The method of presetting the ignition timing of an internal combustion engine having a rotatable shaft and a wheel supported on the shaft for rotation therewith wherein the wheel is a standardized flywheel designed to fit a number of different engines including engines of at least two different sizes of rotatable shafts the largest of which fits the flywheel inner hub and wherein the engine ignition system includes a relatively fixed portion supported by the engine and a movable portion sup ported on the wheel for rotation therewith, the method comprising the steps of: providing a slot in the shaft surface extending generally in the direction of the axis of rotation of the shaft; providing a slot in the wheel along an inner hub thereof; selecting one of a plurality of spacer keys having differing offset amounts, the step of selecting including choosing a spacer key of the appropriate offset amount having a dimension to provide a uniform separation just sufficient to compensate for the difference in size between the largest size shaft and the particular shaft to which the wheel is to be assembled; assembling the wheel to the shaft with the selected spacer key intermediate the wheel and shaft forming a generally uniform separation therebetween by moving the larger open end of the wheel inner hub toward the smaller outer end of a tapered portion of the shaft until the selected spacer key firmly engages both the shaft and the inner hub, and with one part of the selected spacer key occupying the shaft slot and another part of the selected spacer key occupying the wheel slot to thereby fix the angular relationship between the shaft and wheel at the angular offset determined by the particular spacer key selected.
Claim 27
Dependent Claim
35 words
The method of claim 20 wherein each of the plurality of spacer keys is a sleeve of a generally frustoconical configuration having a relatively uniform side wall thickness which is the uniform separation providing dimension.
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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) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |