Patent US4572698A successfully refreshed from Google Patents.
US4572698A
Expired / Lapsed
US
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Key stop for a marine propeller shaft
Assignee: GENERAL POPELLER COMPANY A FLA CORP
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Filing: 1984-02-10
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Granted: 1986-02-25
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Expires: 2004-02-10
Abstract
Abstract An improved key stop for use in connection with a marine propeller and drive shaft assembly. The key includes a pin positioned for insertion into a radial bore in the keyway, thus precluding axial movement fore and aft of the key in the keyway, while retaining ease of installation of the propeller hub on the drive shaft.
Inventors
- 👤 George W. Rauch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:55
CPC Classifications
F; F16; F16D; F16D1/00; F16D1/06; F16D1/08; F16D1/09; F16D1/092; B; B63; B63H; B63H23/00; B63H23/32; B63H23/34; F16D1/0876; F16B; F16B2200/00; F16B2200/69; Y; Y10; Y10T; Y10T403/00; Y10T403/70; Y10T403/7018; Y10T403/7021
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
236 words
A tapered marine propeller shaft and key apparatus comprising: a shaft for use in driving a propeller to obtain thrust for propelling a boat in water, said shaft having an aft end portion and a tapered portion adjacent from said aft end portion; said aft end portion being threaded to accept a nut; a propeller hub having a tapered interior hub portion; said shaft tapered portion being matable with said hub tapered portion; an axial keyway in each of said tapered portions, including a first keyway in said hub portion extending through at least the fore propeller side, and a second keyway in said shaft tapered portion extending through at least said threaded aft end portion; said second keyway having a radial bore; a key having a pin extending from one surface of said key normal to the longitudinal axis of said key; said pin being located on said key for insertion into said bore on positioning said key in said keyway; means on the key accommodating a certain accumulation of dirt in the keyway while still providing a tight fit of the key; said hub portion being mounted on said shaft and locked in place by locking nut means on said threaded aft end portion, said pin thereby precluding movement of said key in both fore and aft axial directions in said keyway while maintaining facility in the assembly of said shaft and key apparatus.
Claim 2
Dependent Claim
236 words
A tapered marine propeller shaft and key apparatus comprising: a shaft for use in driving a propeller to obtain thrust for propelling a boat in water, said shaft having an aft end portion and a tapered portion adjacent from said aft end portion; said aft end portion being threaded to accept a nut; a propeller hub having a tapered interior hub portion; said shaft tapered portion being matable with said hub tapered portion; an axial keyway in each of said tapered portions, including a first keyway in said hub portion extending through at least the fore propeller side, and a second keyway in said shaft tapered portion extending through at least said threaded aft end portion; said second keyway having a radial bore; a key having a pin extending from one surface of said key normal to the longitudinal axis of said key; said pin being located on said key for insertion into said bore on positioning said key in said keyway; means on the key accommodating a certain accumulation of dirt in the keyway while still providing a tight fit of the key; said hub portion being mounted on said shaft and locked in place by locking nut means on said threaded aft end portion, said pin thereby precluding movement of said key in both fore and aft axial directions in said keyway while maintaining facility in the assembly of said shaft and key apparatus.
Claim 3
Dependent Claim
50 words
The shaft and key assembly of claim 1 wherein said key is rectangular, having a chamfered edge at one end and wherein said pin is spaced in close proximity to the chamfered edge and extends from the longitudinal surface bearing the chamfered corner for ease of removal of said key.
Claim 4
Dependent Claim
19 words
The shaft and key assembly of claim 1 wherein said bore is located near said threaded aft end portion.
Claim 5
Dependent Claim
204 words
A tapered marine propeller shaft end and key assembly for receiving a mating propeller hub, said assembly comprising: said propeller hub having an internal opening tapering from a front diameter opening to a smaller rear diameter opening; a shaft having a threaded end portion and a tapered portion adjacent said threaded end portion; said tapered portion being matable with said tapered hub internal opening; an axially extending keyway formed in said shaft from said tapered portion to said threaded end portion; an axially extending keyway formed in said hub; a key sized to fit tightly within each of said keyways; means on the key accommodating a certain accumulation of dirt in the keyway while still providing a tight fit of the key; said keyways each having a uniform depth of approximately one-half the radial thickness of said key; a radial bore within said keyway; a pin on said key, said pin extending from a bottom surface of said key in perpendicular relation thereto; said pin having one chamfered edge on said bottom surface nearest said pin; said pin being insertable into said bore on placement of said key into said keyway thereby precluding movement of said key in both fore and aft axial directions.
Claim 6
Dependent Claim
204 words
A tapered marine propeller shaft end and key assembly for receiving a mating propeller hub, said assembly comprising: said propeller hub having an internal opening tapering from a front diameter opening to a smaller rear diameter opening; a shaft having a threaded end portion and a tapered portion adjacent said threaded end portion; said tapered portion being matable with said tapered hub internal opening; an axially extending keyway formed in said shaft from said tapered portion to said threaded end portion; an axially extending keyway formed in said hub; a key sized to fit tightly within each of said keyways; means on the key accommodating a certain accumulation of dirt in the keyway while still providing a tight fit of the key; said keyways each having a uniform depth of approximately one-half the radial thickness of said key; a radial bore within said keyway; a pin on said key, said pin extending from a bottom surface of said key in perpendicular relation thereto; said pin having one chamfered edge on said bottom surface nearest said pin; said pin being insertable into said bore on placement of said key into said keyway thereby precluding movement of said key in both fore and aft axial directions.
Claim 7
Dependent Claim
17 words
The assembly of claim 4 wherein said keyway extends through a segment of said threaded end portion.
Claim 8
Dependent Claim
18 words
The assembly of claim 4 wherein said propeller hub has an axial keyway extending through the front opening.
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) | 1989-02-24 | 1989-08-26 | 1990-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-24 | 1993-08-26 | 1994-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-24 | 1997-08-26 | 1998-02-25 | $7700.00 | Window Closed / Lapsed |