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US3891349A
Expired / Lapsed
US
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Cooling fan construction and method of making same
Assignee: Wallace Murray Corp
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Filing: 1972-02-22
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Granted: 1975-06-24
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Expires: 1992-02-22
Abstract
Abstract A cooling fan formed of two sheet metal layers joined to a centrally contained spider arm. The configuration of the resulting blade is streamlined or an airfoil in cross section. In constructing the fan the surface pieces are normally spaced from the central support arm and during assembly are forced together and joined to the arm. The resulting stress imposed on the leading and trailing edges of the surface sheets reduces vibratory stresses in the blade. In one embodiment the trailing edge of one of the sheets is permitted to slide along the surface of the other sheet when the other sheet is decambering due to centrifugal and aerodynamic forces generated by rotation of the fan. The result is to vary the moment arm of the restraining forces imposed on the decambering trailing portion of the flexing sheet, thus giving better control of the decambering rate of that sheet.
Inventors
- 👤 Jr William E Woollenweber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:01
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/66; F04D29/661; F04D29/668; F04D29/26; F04D29/32; F04D29/38
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
152 words
A fan blade construction adapted for use in cooling systems for automotive and truck applications, said construction including, a. an elongated spider arm, b. a pair of sheet metal, elongated sheets of generally rectangular configuration, each sheet having a leading lengthwise edge and a trailing lengthwise edge, c. said sheets being of a width greater than the width of said spider arm, d. said sheets each being secured to said spider arm, to sandwich the spider arm, the longitudinal axis of the arm and the said sheets being substantially parallel, e. at least one of said sheets being convex with respect to said spider arm, f. at least one of said leading lengthwise edges of said pair of sheets resiliently abuting the other sheet of said pair of sheets, g. whereby force would have to be exerted to displace the resiliently abutting leading lengthwise edge from the sheet against which it bears.
Claim 2
Dependent Claim
152 words
A fan blade construction adapted for use in cooling systems for automotive and truck applications, said construction including, a. an elongated spider arm, b. a pair of sheet metal, elongated sheets of generally rectangular configuration, each sheet having a leading lengthwise edge and a trailing lengthwise edge, c. said sheets being of a width greater than the width of said spider arm, d. said sheets each being secured to said spider arm, to sandwich the spider arm, the longitudinal axis of the arm and the said sheets being substantially parallel, e. at least one of said sheets being convex with respect to said spider arm, f. at least one of said leading lengthwise edges of said pair of sheets resiliently abuting the other sheet of said pair of sheets, g. whereby force would have to be exerted to displace the resiliently abutting leading lengthwise edge from the sheet against which it bears.
Claim 3
Dependent Claim
15 words
The fan blade construction of claim 1 wherein said leading lengthwise edges abut each other.
Claim 4
Dependent Claim
53 words
The fan blade construction of claim 1 wherein at least one of said trailing lengthwise edges of said pair of sheets resiliently abuts the other sheet of said pair of sheets, whereby force would have to be exerted to displace the resiliency abutting trailing lengthwise edge from the sheet against which it abuts.
Claim 5
Dependent Claim
15 words
The fan blade construction of claim 3 wherein said trailing lengthwise edges abut each other.
Claim 6
Dependent Claim
53 words
The fan blade construction of claim 2 wherein at least one of said trailing lengthwise edges of said pair of sheets resiliently abuts the other sheet of said pair of sheets, whereby force would have to be exerted to displace the resiliently abutting trailing lengthwise edge from the sheet against which it abuts.
Claim 7
Dependent Claim
31 words
The fan blade construction of claim 3 wherein one of said trailing lengthwise edges has a curled portion, curving away from the sheet which it abuts, to thereby reduce stress concentrations.
Claim 8
Dependent Claim
16 words
The fan blade construction of claim 1 wherein said sheets are of different degrees of resiliency.
Claim 9
Dependent Claim
16 words
The fan blade construction of claim 5 wherein said sheets are of different degrees of resiliency.
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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |