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EP0021435A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Air-powered motor and a rotor therefor

Assignee: Black and Decker Inc
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Filing: 1980-06-26
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Granted: —
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Expires: 2000-06-26
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Abstract

Abstract The present invention is directed to an air-powered motor and a turbine rotor therefor which can be used to drive small power tools, such as a vacuum cleaner floor tool, a sander or a grinder, and in which the motor can be coupled to a household vacuum cleaner to provide a source of vacuum or forced air to drive the turbine rotor. The turbine rotor has a structure which substantially increases the efficiency of the motor as compared to prior art devices and, in particular, the motor comprises a housing having a turbine chamber, an air inlet and an air outlet. The turbine rotor is rotatably mounted in the chamber, the turbine rotor having a plurality of turbine blades extending from the outer surface of the rotor towards the interior thereof. A plurality of turbine buckets are formed in the rotor, the top and bottom of the buckets being formed by a semi-circular wall. The structural elements which form the buckets are positioned with respect to one another such that the bucket angle of the bucket β ≦ 60°, the bucket radius ratio ≦ 0.44 and the blade inlet angle a g 27°. Further- more, the turbine rotor is balanced to further enhance the efficiency of the motor.

Inventors

  • 👤 Stanley Joseph Rodowsky Jr.

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 08:26
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/02; A47L9/04; A47L9/0405; A47L9/0416; F; F01; F01D; F01D1/00; F01D1/34; F04; F04D; F04D17/00; F04D17/02; F04D17/04; F04D29/00; F04D29/26; F04D29/28

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 90 words
An air-powered motor comprising a housing (1) having a turbine chamber (7), an air inlet (3) and an air outlet (5); a turbine rotor (13) rotatably mounted in said chamber (7), characterized in that said turbine rotor (13) having a plurality of turbine buckets wherein the bucket angle of each of said buckets is β ≦ 60°; and a nozzle means (9) formed in said chamber (7) between said inlet opening (3) and said rotor (13) for directing air from said air inlet into the buckets of said rotor (13).
Claim 2
Dependent Claim 90 words
An air-powered motor comprising a housing (1) having a turbine chamber (7), an air inlet (3) and an air outlet (5); a turbine rotor (13) rotatably mounted in said chamber (7), characterized in that said turbine rotor (13) having a plurality of turbine buckets wherein the bucket angle of each of said buckets is β ≦ 60°; and a nozzle means (9) formed in said chamber (7) between said inlet opening (3) and said rotor (13) for directing air from said air inlet into the buckets of said rotor (13).
Claim 3
Dependent Claim 16 words
An air-powered motor as set forth in claim 1 wherein the radius ratio of said bucket
Claim 6
Dependent Claim 26 words
An air-powered motor as set forth in any of claims 1 or 2 wherein the blade inlet angle of each of said buckets α ≦ 27°.
Claim 7
Dependent Claim 14 words
An air-powered motor as set forth in claim 3 wherein 15°≦ α ≦ 27°.
Claim 8
Dependent Claim 34 words
An air-powered motor as set forth in any of claims 1 or 2 wherein said air inlet (3) and said air outlet (5) are offset from one another with respect to the bucket opening.
Claim 9
Dependent Claim 25 words
An air-powered motor as set forth in any-of claims 1 or 2 wherein said turbine rotor (13) is dynamically balanced about its axis of rotation.
Claim 10
Dependent Claim 29 words
An air-powered motor as set forth in claim 1 wherein the width of said nozzle (3) is less than, or equal to, 1/2 the width of said rotor (13).
Claim 11
Dependent Claim 248 words
An air-powered motor for driving a tool as set forth in any of the preeding claims characterized by the turbine rotor means (13) including a shaft (15) aligned with the axis thereof, said rotor means (15) being rotatably mounted in said chamber (7) on said shaft (15), said shaft having an output portion means extending outside of said housing (1) for coupling said turbine rotor means to a tool (10), said turbine rotor means (13) further including turbine blades (23) extending from the peripheral surface of said rotor towards the interior thereof, and a plurality of turbine buckets formed in said rotor (13), wherein the top and bottom of said bucket is formed by adjacent turbine blades (23), the sides of each bucket are formed by the sides (29) of the turbine rotor, and the bottom of each bucket is formed by a wall (27) extending between the ends of said turbine blades (23); a nozzle means (9) formed in said chamber (7) between said inlet opening (3) and said turbine rotor means (13) for directing air from said air inlet into said buckets; wherein air flows into said air inlet, through said nozzle (9), into said bucket, and against the bottom (27) thereof, and then out of said bucket in the opposite direction, and then into said chamber (7) and out of said air outlet (5), thereby rotating said turbine rotor means (13) whereby the output portion means of said shaft is rotated for driving a tool.
Claim 12
Dependent Claim 30 words
An air-powered motor as set forth in claim 8 wherein said air power source is a means coupled to said air inlet (3) for driving air through said air inlet.
Claim 13
Dependent Claim 104 words
A turbine rotor (13) for use in an air-powered motor according to one of the preeding claims, characterized by a) a pair of parallel circular side walls (29); b) a plurality of turbine blades (23) extending between said side walls (29); c) wall means (27) extending between said side walls (29) and between adjacent turbine blades (23), wherein side walls, turbine blades and wall means form a plurality of buckets in said rotor having open ends positioned around the periphery of the rotor (13) and wherein the bucket angle of said buckets is β ≦ 60°; d) the said wall means (27) is semicircular.

References Cited (Backward Citations)

FR1103927A Cited
US2962748A Cited
US3044100A Cited
DE2203284A1 Cited
US4014625A Cited
DE2746202A1 Cited

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