US4892460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propeller breeze enhancing blades for conventional ceiling fans
Assignee: Individual
•
Filing: 1989-01-30
•
Granted: 1990-01-09
•
Expires: 2009-01-30
Abstract
Abstract Aerodynamically designed and improved auxiliary blade attachment that wedge firmly onto the trailing edges of the main blades of conventional ceiling fans. The highly functional shape and super lightweight one-piece construction of these easy-to-use auxiliary blades and their strategic placement on the main fan blades serve to heighten the angle of incidence and thus create an intensified dual air current laterally and downwardly in relation to the fan's central core. The result is a dynamic increase of cubic feet of propeller-cooled air per minute without electrically increasing the velocity of ceiling fan rotation.
Inventors
- 👤 Steve J. Volk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:10
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/38; F04D29/388; F04D25/00; F04D25/02; F04D25/08; F04D25/088
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
143 words
Propeller breeze enhancing blade attachments for conventional ceiling fans wherein said auxiliary blades wedge firmly onto the trailing edges of primary fan blades to increase the angle of incidence and thus create a greatly increased dual air flow outward and downward in relation to the fan's central core; said blade attachments comprised of top and bottom surfaces, leading and trailing side edges, and inner and outer ends; configuration of said top and bottom surfaces being convex and concave respectively, with said leading edge being of greater depth than said trailing edge, and said outer end being of greater width and lesser depth than said inner end, with said leading edge housing the means of securing said auxiliary blades to the primary fan blades via a flexible tapered groove along said auxiliary blades' leading edge extending from their inner end to their outer end.
Claim 2
Dependent Claim
143 words
Propeller breeze enhancing blade attachments for conventional ceiling fans wherein said auxiliary blades wedge firmly onto the trailing edges of primary fan blades to increase the angle of incidence and thus create a greatly increased dual air flow outward and downward in relation to the fan's central core; said blade attachments comprised of top and bottom surfaces, leading and trailing side edges, and inner and outer ends; configuration of said top and bottom surfaces being convex and concave respectively, with said leading edge being of greater depth than said trailing edge, and said outer end being of greater width and lesser depth than said inner end, with said leading edge housing the means of securing said auxiliary blades to the primary fan blades via a flexible tapered groove along said auxiliary blades' leading edge extending from their inner end to their outer end.
Claim 3
Dependent Claim
77 words
The propeller breeze enhancing blade attachments of claim 1 in which said auxiliary blades are grooved along the entire length of their leading edge, with said groove being flexible and tapered to tightly wedge onto and firmly grip the trailing edges of the main fan blades, said groove's entry aperture being c.3 mm. in vertical depth, its seating base being c.3.2 cm. in horizontal depth, and said groove's rear wall being c. 5 mm. in vertical depth.
Claim 4
Dependent Claim
82 words
The propeller breeze enhancing blade attachments of claim 2 in which said auxiliary blades wedge securely onto the primary fan blades by means of: (a) the flexible tapered groove which is c.2 mm. less in depth at its front than at its rear to insure a tight grip, and (b) during fan operation the horizontal air pressure and uplift created by the interaction of the convex top and concave underside of said auxiliary blades secures them further to the main supporting blades.
Claim 5
Dependent Claim
36 words
The propeller breeze enhancing blade attachments of claim 2 in which said auxiliary blades accept all standard size ceiling fan blade lengths of 36", 48", and 52", with a main blade chord depth of c.5 mm.
Claim 6
Dependent Claim
35 words
The propeller breeze enhancing blade attachments of claim 1 in which said auxiliary blades are of one-piece construction with no separate parts to wear out, service, or replace, and operate virtually noiseless and maintenance free.
Claim 7
Dependent Claim
51 words
The propeller breeze enhancing blade attachments of claim 1 in which said auxiliary blades are of super light weight and of sparse mass, being constructed basically of expanded fluorocarbon+CO 2 and thus create less drag on the ceiling fan motor that other auxiliary blades made of heavier plastics, wood, or metal.
Claim 8
Dependent Claim
91 words
The propeller breeze enhancing blade attachments of claim 1 in which the vertical depth of the tapered leading edge of said auxiliary blades is c.2.5 cm.>2 cm. with the greater depth being at said blades' inner end, the chord depth of said auxiliary blades' trailing edge is c.1 cm., the length of said blades' leading edge is c.40.7 cm., the length of said blades' trailing edge is c.39.5 cm., and the chord width of said auxiliary blades is c.15.2 cm. at their outer end, and c.9 cm. at their inner end.
Claim 9
Dependent Claim
40 words
The propeller breeze enhancing blade attachments of claim 1 in which said auxiliary blades' angle of incidence is c.45° and the main fan blades' original angle of incidence is c.20°, the combined angle of incidence thus being increased to c.32.5°.
Claim 10
Dependent Claim
37 words
The propeller breeze enhancing blade attachments of claim 7 in which the enlarged angle of incidence from c.20° to c.32.5° represents a c.50% increase, and produces a correlative increase of c.50% in the fan's CFM output efficiency.
Claim 11
Dependent Claim
32 words
The propeller breeze enhancing blade attachments of claim 1 in which said auxiliary blades will be available with optional decorative luminous designs and air freshener tabs on the underside of said blades.
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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) | 1993-01-08 | 1993-07-10 | 1994-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-08 | 1997-07-10 | 1998-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-08 | 2001-07-10 | 2002-01-09 | $7700.00 | Window Closed / Lapsed |