US4720244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fan blade for an axial flow fan and method of forming same
Assignee: Hudson Products Corp
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Filing: 1987-05-21
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Granted: 1988-01-19
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Expires: 2007-05-21
Abstract
Abstract There are disclosed a blade for use as part of an axial flow fan and a method of forming such a blade wherein a large concentration of silica particles are molded into the leading edge of a hollow, one-piece molded body which includes a core of reinforced, thermosetting resin having relatively low abrasion resistance.
Inventors
- 👤 George E. Kluppel
- 👤 Robert C. Monroe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:03
CPC Classifications
B; B29; B29D; B29D99/00; B29D99/0025; B29D99/0028; B29C; B29C70/00; B29C70/02; B29C70/021; B29C70/025; B29C70/04; B29C70/28; B29C70/40; B29C70/42; B29C70/44; B29C70/443; B29C70/446; F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/282; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/38; F04D29/388; B29C43/00; B29C43/02; B29C43/10; B29C43/12; B29K; B29K2063/00; B29K2067/00; B29K2067/06; B29L; B29L2031/00; B29L2031/08; F05; F05D; F05D2240/00; F05D2240/20; F05D2240/30; F05D2240/303; Y; Y02; Y02T; Y02T50/00; Y02T50/40
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
51 words
For use as part of an axial flow fan, a blade comprising a hollow, one-piece molded body having leading and trailing edges and including a core of reinforced, thermosetting resin having relatively low abrasive resistance, and a large concentration of silica particles molded into the body along only its leading edge.
Claim 2
Dependent Claim
51 words
For use as part of an axial flow fan, a blade comprising a hollow, one-piece molded body having leading and trailing edges and including a core of reinforced, thermosetting resin having relatively low abrasive resistance, and a large concentration of silica particles molded into the body along only its leading edge.
Claim 3
Dependent Claim
24 words
A fan blade of the character defined in claim 1, wherein the silica particles are molded within the thermosetting resin along with said reinforcement.
Claim 4
Dependent Claim
45 words
A fan blade of the character defined in claim 2, wherein said reinforcement is in the form of fiberglass cloth, and said silica particles are carried within a layer of felt which is folded over the fiberglass cloth along the leading edge of the body.
Claim 5
Dependent Claim
25 words
A fan blade of the character defined in claim 3, wherein the thermosetting resin is selected from a group consisting of vinyl ester and polyester.
Claim 6
Dependent Claim
37 words
A fan blade of the character defined in claim 1, wherein the silica particles are contained within another thermosetting resin which has relatively high abrasion resistance and which is bonded to the thermosetting resin of the core.
Claim 7
Dependent Claim
25 words
A fan blade of the character defined in claim 5, wherein the silica particles are carried within a cloth-like material impregnated with the other resin.
Claim 8
Dependent Claim
26 words
A fan blade of the character defined in claim 5, wherein the first resin is selected from vinyl-ester and polyester, and the other resin is epoxy.
Claim 9
Dependent Claim
129 words
In a method of forming a hollow, one-piece reinforced plastic fan blade body having leading and trailing edges and adapted for use in an axial flow fan, the steps of arranging a large concentration of silica particles along the portion of the core which is to form the leading edge of the body, containing the reinforcement and silica particles within a closed space between a flexible bag and a rigid outer mold conforming to the outer configuration of the body, injecting a thermosetting resin having relatively low abrasion resistance into the space to impregnate the reinforcement, and applying fluid pressure to the inside of the bag while maintaining the resin at a temperature which cures the resin and molds the silica particles into the leading edge of the body.
Claim 10
Dependent Claim
129 words
In a method of forming a hollow, one-piece reinforced plastic fan blade body having leading and trailing edges and adapted for use in an axial flow fan, the steps of arranging a large concentration of silica particles along the portion of the core which is to form the leading edge of the body, containing the reinforcement and silica particles within a closed space between a flexible bag and a rigid outer mold conforming to the outer configuration of the body, injecting a thermosetting resin having relatively low abrasion resistance into the space to impregnate the reinforcement, and applying fluid pressure to the inside of the bag while maintaining the resin at a temperature which cures the resin and molds the silica particles into the leading edge of the body.
Claim 11
Dependent Claim
25 words
In a method of the character defined in claim 8, the further step of molding the silica particles within the resin along with the reinforcement.
Claim 12
Dependent Claim
38 words
In a method of the character defined in claim 9, the further steps of laying up the reinforcement in cloth form, and arranging a layer of cloth-like material containing the particles along the leading edge of the cloth.
Claim 13
Dependent Claim
24 words
In a method of the character defined in claim 10, wherein the thermosetting resin is selected from a group consisting of vinyl-ester and polyester.
Claim 14
Dependent Claim
34 words
In a method of the character defined in claim 8, the further step of containing the silica particles within another thermosetting resin which is molded to the core of reinforcement and first mentioned resin.
Claim 15
Dependent Claim
26 words
In a method of the character defined in claim 12, wherein carrying the silica particles within a cloth-like material which is impregnated with the other resin.
Claim 16
Dependent Claim
30 words
In a method of the character defined in claim 12, wherein the first resin is selected from a group consisting of vinyl-ester and polyester, and the other resin is epoxy.
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) | 1991-01-18 | 1991-07-20 | 1992-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-18 | 1995-07-20 | 1996-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-18 | 1999-07-20 | 2000-01-19 | $7700.00 | Window Closed / Lapsed |