US4379813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propellers and windmills
Assignee: Individual
•
Filing: 1980-06-03
•
Granted: 1983-04-12
•
Expires: 2000-06-03
Abstract
Abstract The present invention provides a propeller or windmill blank comprising a planar sheet of material having markings defining, or being shaped to have, a central or hub region and two blades extending in opposite directions along imaginary lines; and wherein the blank has a marking or line of preferential folding inclined to the first mentioned lines which, when the blank is bent therealong, will result in pitch being applied to the blades.
Inventors
- 👤 John H. Newnham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:07
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/16; B64C11/20; A; A63; A63H; A63H33/00; A63H33/40; Y; Y02; Y02E; Y02E10/00; Y02E10/70; Y02E10/72; Y10; Y10S; Y10S416/00; Y10S416/03; Y10T; Y10T428/00; Y10T428/12; Y10T428/12299
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
161 words
A propeller or windmill blank comprising a planar sheet of material having markings defining a central region and two blades extending in opposite directions along imaginary lines; and wherein the blank has a marking or a line of preferential folding or bending inclined to the imaginary lines which, when the blank is folded or bent therealong, will result in pitch being applied to the blades; a portion having a marking or line of preferential folding or bending on each side of which marking or line the portion is of generally triangular shape, and means for stabilizing a fold or bend on the first said marking or line which will result in pitch being applied, a fold or bend on the second said marking or line and for securing said portion to said central region such that said portion and said central region when so secured together define a hub region of generally tetrahedral shape from edges of which said blades project.
Claim 2
Dependent Claim
161 words
A propeller or windmill blank comprising a planar sheet of material having markings defining a central region and two blades extending in opposite directions along imaginary lines; and wherein the blank has a marking or a line of preferential folding or bending inclined to the imaginary lines which, when the blank is folded or bent therealong, will result in pitch being applied to the blades; a portion having a marking or line of preferential folding or bending on each side of which marking or line the portion is of generally triangular shape, and means for stabilizing a fold or bend on the first said marking or line which will result in pitch being applied, a fold or bend on the second said marking or line and for securing said portion to said central region such that said portion and said central region when so secured together define a hub region of generally tetrahedral shape from edges of which said blades project.
Claim 3
Dependent Claim
34 words
A propeller or windmill as claimed in claim 1, wherein said means includes a projection on one, and an aperture adapted to receive said projection in the other, of said portion and central region.
Claim 4
Dependent Claim
25 words
A propeller or windmill as claimed in claim 1 or claim 2, wherein said portion is separate from said central region when not secured thereto.
Claim 5
Dependent Claim
25 words
A propeller or windmill as claimed in claim 1 or claim 2, wherein said portion is defined by a tab extending from said central region.
Claim 6
Dependent Claim
22 words
A propeller or windmill as claimed in claim 4, wherein said tab is integrally connected to and formed with said central region.
Claim 7
Dependent Claim
26 words
A propeller or windmill blank as claimed in claim 1 wherein the sides of the generally tetrahedral shape are triangles of angles 70°±10°, 55°±5° and 55°±5°.
Claim 8
Dependent Claim
31 words
A propeller or windmill blank as claimed in claim 1, wherein said lines are parallel and spaced such that when said pitch is so applied the lines line in a plane.
Claim 9
Dependent Claim
58 words
A propeller or windmill blank as claimed in claim 4 wherein the central region and the tab each have the shape of a rhomb, wherein the central region and the tab are joined together along a marking or line of preferential folding or bending and such that the rhombs when folded or bent about the third said marking.
Claim 10
Dependent Claim
31 words
A propeller or windmill blank as claimed in claim 1, including a slot in at least one of the central region and said portion for receiving a lightweight longitudinally extending member.
Claim 11
Dependent Claim
19 words
A propeller or windmill as claimed in claim 9, wherein said slot is shaped to grip a drinking straw.
Claim 12
Dependent Claim
108 words
A propeller or windmill formed from a blank comprising a planar sheet of material having markings defining a central region and two blades extending in opposite directions along imaginary lines; and wherein the blank has a marking or line of preferential folding or bending inclined to the imaginary lines which, when the blank is folded or bent therealong, will result in pitch being applied to the blades; a portion having a marking or line of preferential folding or bending on each side of which marking line the portion is of generally triangular shape, and means for stabilizing a fold or bend on the first said marking or line.
Claim 13
Dependent Claim
108 words
A propeller or windmill formed from a blank comprising a planar sheet of material having markings defining a central region and two blades extending in opposite directions along imaginary lines; and wherein the blank has a marking or line of preferential folding or bending inclined to the imaginary lines which, when the blank is folded or bent therealong, will result in pitch being applied to the blades; a portion having a marking or line of preferential folding or bending on each side of which marking line the portion is of generally triangular shape, and means for stabilizing a fold or bend on the first said marking or line.
Claim 14
Dependent Claim
30 words
A propeller or windmill as claimed in claim 11, wherein said means includes a projection on one received in an aperture in the other of said portion and central region.
Claim 15
Dependent Claim
22 words
A propeller windmill as claimed in claim 11 wherein said portion is entirely separate from said central region when not secured thereto.
Claim 16
Dependent Claim
22 words
A propeller or windmill as claimed in claim 11 wherein said portion is defined by a tab extending from said central region.
Claim 17
Dependent Claim
22 words
A propeller or windmill as claimed in claim 14, wherein said tab is integrally connected to and formed with said central region.
Claim 18
Dependent Claim
25 words
A propeller or windmill as claimed in claim 11, wherein the sides of the generally tetrahedral shape are triangles of angles 70°±10°, 55°±5° and 55°±5°.
Claim 19
Dependent Claim
16 words
A propeller or windmill as claimed in claim 11 wherein said lines lie in a plane.
Claim 20
Dependent Claim
85 words
A propeller or windmill as claimed in claim 14 each have the shape of a rhomb, wherein the central region and the tab are joined together along a marking or line of preferential folding or bending and such that the rhombs when folded or bent about the third said marking or line and about diagonals thereof, said diagonals being or the first said marking or line and the second said marking or line, and brought together define together said hub region of generally tetrahedral shape.
Claim 21
Dependent Claim
30 words
A propeller or windmill as claimed in claim 11, including a slot in at least one of the central region and said portion for receiving a lightweight longitudinally extending member.
Claim 22
Dependent Claim
19 words
A propeller or windmill as claimed in claim 19, wherein said slot is shaped to grip a drinking straw.
Claim 23
Dependent Claim
28 words
A propeller or windmill as claimed in claim 20, wherein a drinking straw or other lightweight tubular longitudinally extending member is received in and gripped by said slot.
Claim 24
Dependent Claim
29 words
A propeller or windmill as claimed in claim 11, wherein the blades have a substantial part of their area adjacent the tip and a lesser part adjacent the root.
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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) | 1986-04-11 | 1986-10-11 | 1987-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-11 | 1990-10-11 | 1991-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-11 | 1994-10-11 | 1995-04-12 | $7700.00 | Window Closed / Lapsed |