US3809503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fan construction
Assignee: Ebm Papst St Georgen GmbH and Co KG
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Filing: 1972-07-31
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Granted: 1974-05-07
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Expires: 1992-07-31
Abstract
Abstract A fan, particularly a portable fan, includes a substantially square flat casing having a top wall with an inlet and substantially parallel side walls and front and rear walls. The front wall is provided with an open front face for the discharge of the air from a radially operating motor driven fan wheel which is positioned within the casing in an eccentric arrangement. The casing is provided with a partition wall on the rear wall side of the fan which is substantially cylindrical and the axis of the fan is located so that the clearance between the periphery of the fan and the adjacent side wall at one side is less than at the opposite side. The fan is also oriented so that its axis is positioned at a greater distance toward the curved partition wall on the closer spacing side than the opposite side so that an inwardly spiralling flow path in the form of a volute is provided from one side toward the other.
Inventors
- 👤 V Schlicker
- 👤 G Wrobel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:11
CPC Classifications
F; F04; F04D; F04D25/00; F04D25/02; F04D25/06; F04D25/0606; F04D25/0613; F04D25/064; F04D25/0646
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
122 words
A fan construction comprising a substantially square flat casing having a top wall with an air inlet opening, substantially parallel and rectilinear front and rear walls and substantially parallel and rectilinear side walls interconnecting said front and rear walls, a motor-driven fan wheel in said casing having an axial air intake, radially extending fan blades for radial air discharge and an axis of rotation transverse to said top wall and substantially parallel to said front wall; the axis of rotation of said fan wheel being positioned eccentrically in said casing so that the periphery of said fan wheel is substantially closer to one side wall than to the other; said front wall being substantially fully open to constitute an air discharge opening.
Claim 2
Dependent Claim
122 words
A fan construction comprising a substantially square flat casing having a top wall with an air inlet opening, substantially parallel and rectilinear front and rear walls and substantially parallel and rectilinear side walls interconnecting said front and rear walls, a motor-driven fan wheel in said casing having an axial air intake, radially extending fan blades for radial air discharge and an axis of rotation transverse to said top wall and substantially parallel to said front wall; the axis of rotation of said fan wheel being positioned eccentrically in said casing so that the periphery of said fan wheel is substantially closer to one side wall than to the other; said front wall being substantially fully open to constitute an air discharge opening.
Claim 3
Dependent Claim
28 words
A fan construction, according to claim 1, wherein the lateral dimensions of said top wall are a multiple of the height of said front, rear and side walls.
Claim 4
Dependent Claim
54 words
A fan construction, according to claim 1, including a partition in said casing defining a substantially circularly curved air flow wall on the back wall side of said fan wheel, the spacing between the periphery of said fan wheel and said partition wall increasing constantly in the direction of rotation of said fan wheel.
Claim 5
Dependent Claim
46 words
A fan construction, according to claim 3, wherein said partition is in the form of a semi-circular wall having an axis of curvature substantially parallel to said axis of rotation, said semi-circular wall extending from one side wall to the other side wall of said casing.
Claim 6
Dependent Claim
39 words
A fan construction, according to claim 1, which is a small lightweight fan construction, including a flat electric motor arranged in said casing, said fan wheel being an annular fan wheel and being driven by said flat electric motor.
Claim 7
Dependent Claim
62 words
A small lightweight fan construction, accordinG to claim 5, in which said motor has an external rotor constituting the rotor of said annular fan wheel, and means supporting said radially extending blades on said rotor with their radially inner edges in radially spaced relation to the external periphery of said rotor to define an annular axial air intake for said fan wheel.
Claim 8
Dependent Claim
52 words
A small lightweight fan construction, according to claim 5, in which said casing has a partition wall defining a substantially circularly curved air flow wall on the side of said fan wheel adjacent said back wall, the axis of said fan wheel further being positioned eccentrically with respect to said partition wall.
Claim 9
Dependent Claim
69 words
A small lightweight fan construction, according to claim 7, wherein an imaginary line drawn from a center point of the curvature of the partition wall on the longitudinal axis of the casing through the axis of the fan rotor makes an angle of from 20* to 40* with a line drawn normal to the longitudinal axis of the casing and intersecting the center of curvature of the partition wall.
Claim 10
Dependent Claim
65 words
A small lightweight fan construction, according to claim 7, including an air guide grid located in said discharge opening of said front wall and including rib members extending between said top and bottom wall and curved from the discharge side of said fan wheel on the side thereof with the greatest spacing to the associated side wall outwardly of said casing, said grid being exchangeable.
Claim 11
Dependent Claim
45 words
A small lightweight fan construction, according to claim 7, wherein said casing has an electrical component space defined between said partition wall and said rear wall, and electrical switch means located in said component space, said space being ventilated by openings in said partition wall.
Claim 12
Dependent Claim
27 words
A small lightweight fan construction, according to claim 7, wherein said motor comprises a shaded pole motor having a rotor with a higher electrical short-circuiting ring resistance.
Claim 13
Dependent Claim
30 words
A small lightweight fan construction, according to claim 11, wherein said short-circuiting ring resistance is made of aluminum-silicon alloy and has a reduced cross-section relative to its maximum dimensional cross-section.
Claim 14
Dependent Claim
21 words
A small lightweight fan construction, according to claim 7, including an electrical heater arranged between said fan and said discharge opening.
Claim 15
Dependent Claim
86 words
A small lightweight fan construction, according to claim 7, wherein said casing is made of two half shell parts of generally pot-shape configuration which are joined together, and means for clamping said parts together including a threaded bolt adjacent at least one end of said casing interengaging said top and bottom parts and a disc on each side wall overlying the juncture of said top and bottom parts, and a U-shaped stirrup having leg portions on each side engaged in the respective discs on each side.
Claim 16
Dependent Claim
41 words
A small lightweight fan construction, according to claim 7, including selector switch means in the space between said partition wall and said rear wall of a size in which it is clamped between top and bottom shell portions without additional securement.
Claim 17
Dependent Claim
45 words
A small lightweight fan construction, according to claim 14, wherein each of said discs includes a plurality of angularly spaced notches around its periphery, said stirrup being selectively engageable in respective notches for positioning said stirrup at a desired angle in respect to said casing.
Claim 18
Dependent Claim
26 words
A small lightweight fan construction, according to claim 7, wherein said casing is made of an insulating material, and including an insulating plate covering said motor.
Claim 19
Dependent Claim
82 words
A small lightweight fan construction, according to claim 7, wherein said inlet opening of said top wall comprises a plurality of openings arranged at least partly directly above said fan wheel, said fan wheel being at least partly opened on the side facing said openings, said openings being arranged within a circular area, and sub-dividing ribs extending over said top wall dividing said openings of said circular area and having paralleL guide faces extending parallel to the axis of said fan wheel.
Claim 20
Dependent Claim
22 words
A small lightweight fan construction, according to claim 18, including a separate top plate on said top wall carrying said intake openings.
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) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |