US3608976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fan blade having wear-resistant ribs and fan including a plurality of same
Assignee: Stoody Co
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Filing: 1969-09-12
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Granted: 1971-09-28
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Expires: 1989-09-12
Abstract
Abstract A fan blade is disclosed having a plurality of wear-resistant ribs extending across the width of its working surface and spaced along the length thereof for contacting solid particles, e.g. pulverized coal, to be propelled thereby. A fan including a plurality of blades as above-described is also disclosed.
Inventors
- 👤 Fines A Zugelder
- 👤 Ray K Dehn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:41
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/289
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
86 words
In a fan blade designed for mounting in an outwardly extending radial fashion from a rotor so that the working surface of said blade is substantially forwardly aligned with respect to the direction of rotation of said rotor, the improvement comprising a plurality of ribs extending across said working surface and being spaced apart along the lengTh thereof with the exposed surface of each rib containing a wear-resistant material and being shaped in the form of an inclined plane which rises in the outwardly extending direction.
Claim 2
Dependent Claim
86 words
In a fan blade designed for mounting in an outwardly extending radial fashion from a rotor so that the working surface of said blade is substantially forwardly aligned with respect to the direction of rotation of said rotor, the improvement comprising a plurality of ribs extending across said working surface and being spaced apart along the lengTh thereof with the exposed surface of each rib containing a wear-resistant material and being shaped in the form of an inclined plane which rises in the outwardly extending direction.
Claim 3
Dependent Claim
52 words
Apparatus as claimed in claim 1, wherein each rib is substantially in the form of a right triangle in cross section including a base portion, a sidewall portion and an inclined surface portion, said base portion being bonded to the base of a mating groove in the working surface of the blade.
Claim 4
Dependent Claim
51 words
Apparatus as claimed in claim 2, wherein the angle of inclination formed between the inclined surface portion of the rib and the base of the rib is between 5* and 30* and wherein the spacing between ribs is one-half to 2 times the length of the base portion of the rib.
Claim 5
Dependent Claim
98 words
In a fan including a casing and rotor assembly wherein the rotor has a plurality of blades connected thereto and extending radially outward therefrom toward the wall of the casing with the working surface of each blade being substantially parallel with the axis of said rotor, the improvement comprising a plurality of ribs extending across said working surface and spaced apart along the length thereof with the exposed surface of each rib containing a wear-resistant material and being shaped in the form of an inclined plane the apex of which is at the edge away from said rotor.
Claim 6
Dependent Claim
98 words
In a fan including a casing and rotor assembly wherein the rotor has a plurality of blades connected thereto and extending radially outward therefrom toward the wall of the casing with the working surface of each blade being substantially parallel with the axis of said rotor, the improvement comprising a plurality of ribs extending across said working surface and spaced apart along the length thereof with the exposed surface of each rib containing a wear-resistant material and being shaped in the form of an inclined plane the apex of which is at the edge away from said rotor.
Claim 7
Dependent Claim
28 words
A fan as claimed in claim 4, wherein the ribs have a coating of tungsten carbide on their exposed surfaces in order to make the same wear resistant.
Claim 8
Dependent Claim
41 words
A fan as claimed in claim 4, wherein the working surface of each blade has a plurality of grooves extending across its width, each groove having a base and sidewalls, said ribs being bonded to the blades in the grooves thereof.
Claim 9
Dependent Claim
52 words
A fan as claimed in claim 6, wherein each rib is substantially in the form of a right triangle in cross section including a base portion, a sidewall portion and an inclined surface portion, said base portion being bonded to the base of the groove in the working surface of the blade.
Claim 10
Dependent Claim
52 words
A fan as claimed in claim 7, wherein the angle of inclination formed between the inclined surface portion of each rib and the base of each rib is between 5* and 30* and wherein the spacing between ribs is one-half to 2 times the length of the base portion of each rib.
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |