Patent US3822963A successfully refreshed from Google Patents.
US3822963A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Model airplane propeller spinner
Assignee: Individual
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Filing: 1973-01-24
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Granted: 1974-07-09
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Expires: 1993-01-24
Abstract
Abstract A model airplane spinner to be mounted with a propeller on the propeller shaft and thrust plate of an engine by a propeller retainer and providing a base plate mountable on the propeller to receive the propeller, retained on the propeller shaft, with a hollow dome adapted to be positioned on the front of the base plate to enclose the center of the propeller therein with releasable means for securing the dome in position.
Inventors
- 👤 C Goldberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:31
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/34; B; B64; B64C; B64C11/00; B64C11/02; B64C11/14
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
213 words
A model airplane engine propeller spinner to be mounted with a propeller on the propeller shaft and thrust plate of the engine by a propeller retainer such as a propeller nut threadably tightened on the propeller shaft comprising a circular laminar base plate having an axial passage for receiving the engine propeller shaft axially therethrough, said base plate having a central radial portion adjacent said axial passage with rear and front radial surfaces adapted to complementally engage the front of the thrust plate and the back of the propeller respectively, an axially symmetrical and hollow dome having a base portion which is radially relieved to receive the propeller radially therethrough, said dome having a radial base surface portion adapted to complementally engage the front of said base plate to radially and coaxially position said dome thereon and to enclose the propeller shaft and propeller center within said dome, and means for releasably securing said dome in position on said base plate, whereby said dome may be selectively released and removed from its position on said base plate to allow the propeller retainer to be tightened or loosened on said propeller shaft to respectively retain or loosen said propeller and base plate from said thrust plate to allow the propeller to be separately manipulated.
Claim 2
Dependent Claim
213 words
A model airplane engine propeller spinner to be mounted with a propeller on the propeller shaft and thrust plate of the engine by a propeller retainer such as a propeller nut threadably tightened on the propeller shaft comprising a circular laminar base plate having an axial passage for receiving the engine propeller shaft axially therethrough, said base plate having a central radial portion adjacent said axial passage with rear and front radial surfaces adapted to complementally engage the front of the thrust plate and the back of the propeller respectively, an axially symmetrical and hollow dome having a base portion which is radially relieved to receive the propeller radially therethrough, said dome having a radial base surface portion adapted to complementally engage the front of said base plate to radially and coaxially position said dome thereon and to enclose the propeller shaft and propeller center within said dome, and means for releasably securing said dome in position on said base plate, whereby said dome may be selectively released and removed from its position on said base plate to allow the propeller retainer to be tightened or loosened on said propeller shaft to respectively retain or loosen said propeller and base plate from said thrust plate to allow the propeller to be separately manipulated.
Claim 3
Dependent Claim
32 words
An engine propeller spinner as defined in claim 1 wherein said base plate has means projecting axially from the front thereof to circumferentially position the back of the propeller with respect thereto.
Claim 4
Dependent Claim
92 words
An engine propeller spinner as defined by claim 2 with said base plate propeller positioning means being positioned on said base plate to laterally engage the trailing back edge of the engine propeller and to thereby circumferentially position the propeller with respect to the front of said base plate and said dome securing means aligned with said base plate, to align the proPeller with the radial reliefs in said dome base portion when the propeller is positioned thereon and affixed thereto to allow said dome to be secured to said base plate.
Claim 5
Dependent Claim
87 words
An engine propeller spinner as defined in claim 1 wherein said means for releasably securing said dome comprises three passage portions in said base plate having respective passages formed axially therein and equally radially and angularly spaced about the base plate axis, and three pins extending axially from said dome base portion and adapted to be in respective registry with said three base plate passages to engage said base plate within the passages of said passage portions to retain said dome in position on said base plate.
Claim 6
Dependent Claim
90 words
An engine propeller spinner as defined in claim 4 wherein said base plate propeller positioning means comprises projections respectively positioned adjacent said pin passages in said base plate and adapted to engage the rear edge of the propeller to circumferentially position the propeller axially adjacent said pin passages when the propeller is mounted on said base plate front surface and propeller shaft, and said dome radial propeller reliefs are correspondingly positioned adjacent said dome pins to accommodate the propeller when said dome is positioned and retained on said base plate.
Claim 7
Dependent Claim
106 words
An engine propeller spinner as defined in claim 4 wherein said passage portions comprise separate axial passages having radially inwardly extending and resiliently deformable ridges, and said dome pins have tapered and resiliently deformable end portions having a small diameter adjacent the pin end and a larger diameter portion inward from said pin end and larger than the inner diameter of said passage ridges, whereby said pins will be respectively snapped into and retained in said passages by axial interference between said ridges and respective large diameter pin portions when the pin end portions are inserted axially through and beyond said passage ridges in said passage.
Claim 8
Dependent Claim
63 words
An engine propeller spinner as defined in claim 6 wherein said dome pins have an axial relief passage opening in the ends thereof and extending inwardly beyond said respective ridges thereof for allowing radially inward deformation of said pin end portions and radially outward deformation of said passage ridges to facilitate resiliently deformative passage of said pins in said base plate passage portions.
Claim 9
Dependent Claim
77 words
An engine propeller spinner as defined in claim 7 wherein said pin relief passages are adapted to receive and retain a plug in engagement with the sides of said pin passages, and a plug is provided for insertion into said pin passages to selectively reduce the radially inward deformability of said dome pins, as otherwise provided by said pin relief passages, to selectively increase the retentive force of said relief pins with respect to said passage portions.
Claim 10
Dependent Claim
52 words
An engine propeller spinner as defined in claim 8 wherein said plug comprises a tapered screw whereby said screw will selectively reduce the radial inward deformability of said pins, and thereby increase the pin retentive force, according to the extent to which said screw is threaded axially into said pin relief passages.
Claim 11
Dependent Claim
64 words
An engine propeller spinner as defined in claim 4 wherein a radial slot is provided in said dome base surface portion to allow ready entry of a tool whereby said dome can be urged away from engagement with said base plate against the retentive action between said axial dome pins and said axial base plate passages to release said dome from said base plate.
Claim 12
Dependent Claim
64 words
An engine propeller spinner as defined in claim 1 wherein said dome base surface portion includes an axially extending flange adjacent the periphery thereof, and said base plate is provided with a recess for complementally receiving said dome flange when said dome is positioned thereon whereby outward radial movement of the rear portion of said dome with respect to said base plate is prevented.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |