Patent US932254A successfully refreshed from Google Patents.
Patent US3860362A successfully refreshed from Google Patents.
US3860362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible bladed fan
Assignee: Ford Motor Co
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Filing: 1973-12-14
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Granted: 1975-01-14
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Expires: 1993-12-14
Abstract
Abstract A flexible blade fan assembly suitable for use as an automobile radiator cooling fan. The leading edges of the flexible blades are riveted between the fan spider arms and reinforcement strips or clamps. The radially inner edges of the blades are shaped to minimize or reduce stress concentrations at their intersections with the edges of the reinforcement strips, i.e., the inner radial edge of each fan blade approaches the trailing edge of the adjacent reinforcement strip either tangentially or at an acute angle.
Inventors
- 👤 Allen J Bentley
- 👤 Ashok K Goyal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:15
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/34
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
141 words
A fan structure including a spider having arms extending generally radially outwardly from a central hub portion, a reinforcing member overlying one face of each of said arms, flexible fan blades having portions underlying said reinforcing members, fasteners securing said reinforcement members and said blades to said arms, each of said blades having at least a leading edge, a trailing edge and a radially inner edge, said reinforcing members overlying the portions of said blades adjacent said leading edges, the portions of said blades trailing said reinforcing members when viewed in a radial direction being simple curves curving in a single direction, each said reinforcing member having a trailing edge extending generally parallel to the arm to which it is secured, said inner edge of said blade including a concave curved portion tangentially approaching said trailing edge of said reinforcing member.
Claim 2
Dependent Claim
141 words
A fan structure including a spider having arms extending generally radially outwardly from a central hub portion, a reinforcing member overlying one face of each of said arms, flexible fan blades having portions underlying said reinforcing members, fasteners securing said reinforcement members and said blades to said arms, each of said blades having at least a leading edge, a trailing edge and a radially inner edge, said reinforcing members overlying the portions of said blades adjacent said leading edges, the portions of said blades trailing said reinforcing members when viewed in a radial direction being simple curves curving in a single direction, each said reinforcing member having a trailing edge extending generally parallel to the arm to which it is secured, said inner edge of said blade including a concave curved portion tangentially approaching said trailing edge of said reinforcing member.
Claim 3
Dependent Claim
26 words
A fan structure according to claim 1, a reinforcement extension overlying a leading portion of each of said blades, said reinforcing member overlying said reinforcement extension.
Claim 4
Dependent Claim
184 words
A fan structure including a spider having arms extending radially outwardly from a central hub portion, reinforcing members overlying one face of each of said arms and extending beyond the ends of said arm, flexible fan blades having leading portions underlying at least portions of said reinforcing members, said fan blades having portions trailing said reinforcing members, said trailing portions when viewed in a radial direction being simple curves curving in a single direction, and fastening means spaced along the length of each arm to rigidly join the arm, reinforcing member and blade, each of said fan blades having a leading edge, a trailing edge and a radially inner edge interconnecting the leading edge and the trailing edge, the leading edge of each of said fan blades having a greater radial length than the trailing edge of each of said fan blades, said radially inner edge including a first edge portion and a second edge portion, said reinforcing member overlying said first portion, said first portion and said second portion being interconnected by a curved edge tangentially approaching an edge of said reinforcing members.
Claim 5
Dependent Claim
184 words
A fan structure including a spider having arms extending radially outwardly from a central hub portion, reinforcing members overlying one face of each of said arms and extending beyond the ends of said arm, flexible fan blades having leading portions underlying at least portions of said reinforcing members, said fan blades having portions trailing said reinforcing members, said trailing portions when viewed in a radial direction being simple curves curving in a single direction, and fastening means spaced along the length of each arm to rigidly join the arm, reinforcing member and blade, each of said fan blades having a leading edge, a trailing edge and a radially inner edge interconnecting the leading edge and the trailing edge, the leading edge of each of said fan blades having a greater radial length than the trailing edge of each of said fan blades, said radially inner edge including a first edge portion and a second edge portion, said reinforcing member overlying said first portion, said first portion and said second portion being interconnected by a curved edge tangentially approaching an edge of said reinforcing members.
Claim 6
Dependent Claim
142 words
A fan structure including a spider having arms extending generally radially outwardly from a central hub portion, a reinforcing member overlying one face of each of said arms, flexible fan blades having portions underlying said reinforcing members, fasteners securing said reinforcing members and said blades to said arms, each of said blades having at least a leading edge, a trailing edge and a radially inner edge, said reinforcing members overlying the portions of said blades adjacent said leading edges, the portions of said blades trailing said reinforcing members when viewed in a radial direction being simple curves curving in a single direction, each said reinforcing member having a trailing edge extending generally parallel to the arm to which it is secured, said inner edge of said blade including a portion approaching said trailing edge of said reinforcing member at an acute angle.
Claim 7
Dependent Claim
142 words
A fan structure including a spider having arms extending generally radially outwardly from a central hub portion, a reinforcing member overlying one face of each of said arms, flexible fan blades having portions underlying said reinforcing members, fasteners securing said reinforcing members and said blades to said arms, each of said blades having at least a leading edge, a trailing edge and a radially inner edge, said reinforcing members overlying the portions of said blades adjacent said leading edges, the portions of said blades trailing said reinforcing members when viewed in a radial direction being simple curves curving in a single direction, each said reinforcing member having a trailing edge extending generally parallel to the arm to which it is secured, said inner edge of said blade including a portion approaching said trailing edge of said reinforcing member at an acute angle.
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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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |