Fan

Application filed June 8, 1929. Serial No. 389,333.

My invention relates to a fan, and particularly to a motor driven fan. One purpose is the provision of a compound fan in which a plurality of fan members are rotated in 5 opposite directions. Another object is the provision of a fan motor in which the armature and field of the motor are both rotatably mounted, and rotate in opposite directions, and both carry fan blades or elements. 10 Another object is the elimination of the spiral effect caused by the usual type of single . disc fan. Another object is the creation of a breeze which has a greater penetration for a given power input. Another object is 15 quietness in operation obtained as a result of slow speed. Another object is the provision of a greater delivery of air by a fan of given diameter. Other objects will appear from time to time in the course of the ²⁰ specification and claims.

I illustrate my invention more or less diagrammatically in the accompanying drawings, wherein—

Figure 1 is an elevation along the axis ²⁵ of the fan, with parts broken away; and

Figure 2 is a section on the line 2—2 of Figure 1.

Like parts are indicated by like symbols throughout the specification and drawings. ³⁰ Referring to the drawings herein it will be understood that although I have shown the fan mounted on an adjustable bracket, such as may be used for furnace fan operation, I do not wish to be limited to such use, ³⁵ as the fan may be applied for example to desk, ceiling or ventilation use.

Referring to the drawings, A generally indicates any suitable base member, the central hub or support A¹ and the round en⁴⁰ gaging members A². A³ is a stem or tube upwardly projecting from the Central hub A¹. At its upper end, as in Figure 1, is indicated the locking or adjusting sleeve A⁴which is slidable up and down the member A^{3 45} but which may be set at any desired position therealong, as by the locking screws A⁵. It may include or have associated with it the adjusting segment A⁶, clearly indicated in Figure 2 which has the single pivot aperture ⁵⁰ A⁷, and the plurality of adjusting apertures

A⁸ through which may pass any desired securing means, for example the screw A⁹.

Referring to the motor I have illustrated more or less diagrammatically an old style split phase shaded pole motor, both field and 55 armature being rotatably mounted. To support the various rotatable parts I may employ the single hollow bearing shaft B which is mounted within the hub B¹ with its terminal aperture housing or shield including 60 a portion B² perpendicular to the axis of the shaft B and the cylindrical circumferential flange Β³. Β⁴ B⁴ indicate any suitable locking members or screws, whereby the members B and B¹ may be held against relative ⁶⁵movement. B^B indicates a flat part or projection from the end of the member B¹ which is apertured as at B³ to receive the adjusting screw A⁹ which in turn may be inserted at choice in any one of the adjusting apertures ⁷⁰A^s of the segment A⁶. Any desired pivotal securing and supporting means may be employed for securing the member B¹ in relation to the aperture A⁷ of the segment whereby the entire motor and fan device may be ⁷⁸rotated about the center A⁷ for adjustment in fixed relation to any one of the apertures A⁸ of the segment A⁶.

The shaft B is indicated as hollow, the inner space C serving as a lubrication sup- ⁸⁸plying conduit. The aperture C¹ is aligned with the corresponding aperture C² in the hub B¹, which may be closed as by the hinged cap C³, whereby lubricant may be admitted. C⁴ C⁵ are apertures intermediate the ends of ⁸⁸the shaft B, whereby the lubricant so supplied may be delivered to the rotating parts below described. The ends of the shaft B are closed as by the screws C³ C⁷. The screw C⁷ is provided with a readily extended head ⁰⁰of a diameter greater than the outside diameter of the shaft B, the purpose of this extension being later discussed.

Referring to the motor proper the field structure is generally indicated as D. It in- ⁰⁵eludes the bearing hub D¹ with the inner oiling space D² aligned with the aperature C‘ and the oiling passages D⁵. The hub rotates about the shaft B one end abutting against the washers or packings D³ which are between ¹⁰⁰

1,886,687 in one direction and the field in the other, the fan blades H¹ and H³ being pitched in opposite directions. Each set of blades assists the other in producing a current of air, but the spiral effect which is created ⁷⁰by the usual type of single disc fan is eliminated by the use of two sets of blades revolving in opposite directions.

Owing to the employment of two sets of blades which supplement each other, a breeze W is created the penetration of which for a given power output is greater than in the prior art form of fan in which a single rotating member or set of blades is employed.

Owing to the employment of two sets of 80 blades lie speed of the motor, for a given delivery of air can be greatly reduced. Each set of blades is driven at, say, half the number of rotations per minute of the ordinary fan employing a single set of blades. The 85 reduction in the speed of the motor and the reduction in the speed of rotation of the fan members themselves results in a very quiet operation.

A greater delivery of air is produced by 80 a fan of given diameter. The spiral effect, which is a limiting factor in the simple disc or single fan set type, is eliminated.

The device herein shown is easily lubricated and the wear on the moving parts is #5 greatly reduced. In the first place, the speed of rotation is cut in half. In the second place by employing the hollow shaft B as the bearing support,! am able tb employ it to deliver lubricant, through the apertures C⁴ C⁵, to 100 the spaces D² and E². The inclined ducts D⁵ and E³ deliver the lubricant to the antifrictional washers D^e D⁸ and E⁴, and to the outer face of the shaft B. The result is a thorough lubrication with a minimum of 105 heating and upkeep.

In the particular form of fan herein shown ready adjustment is provided for the angle of the fan and the height of the fan. The fan assembly may be vertically adjusted HO on the shaft A⁸. It may be rotated about the shaft A⁸. And its angle may be varied from the horizontal, as by varying its angle of attachment to the segment A⁸.

In my drawings I have illustrated fans HO of the centrifugal type. It is characteristic of the fan blades which I employ that they will take air at any velocity and add velocity to it. I am thereby enabled to employ two sets of members, one boosting the other. The 120 centrifugal type of fan is particularly efficient if used in a duct, as in air heating systems, since it has the characteristic of building up pressure. Whan used in a duct, as contrasted to the use of the ordinary screw 125 propeller, it will load up rather than unload and increases its efficiency, as compared to its efficiency in the open. The angle of the fan elements increases from tip to center. The fan blows air back over the motor and ³³⁰ the hub D¹ and the inward projection D⁷ of the hub B¹. D⁸ indicates other washers or packings or anti-friction members positioned at the opposite end of the hub D\ D⁹ is an g outwardly extending web upon which is supported the frame portion proper D¹⁰ to which is bolted or secured the field wiring or coils generally indicated as D¹¹. These may be secured as by the stud D¹² with its nut D¹³. io D¹⁴ is an extension of the web from the opposite direction, to which is secured the nonconductive disc D¹⁵ upon which are mounted the contact rings D¹⁸.

The armature includes a hub E¹ corre15 sponding to the hub D¹ and having an inner oiling aperture E² with its oiling ducts E³. The hub is confined between the washers D⁸and the terminal washer E⁴, the screw head C⁷ serving to maintain the hubs D¹ and E¹20 in position on the shaft B. E^s is a cap which rotates with the hub E¹ and surrounds the ' screw C⁷ and protects the washer E⁴. E⁸indicates an outer frame and web member projecting from the hub E¹ and terminating 28 in the circumferential flange E⁷ which closely approaches the cylindrical portion D¹⁰ of the field assembly D. E⁸ diagrammatically indicates the wiring of the armature.

Since the electrical details of the motor do so not of themselves form part of the present invention I am making no detailed showing of the wiring or circuit. It will be observed from Figure 1 that I may employ brushes or contacts G G¹ with the supporting member 35 G² which may be secured to or associated with the frame extension B² of the hub B¹. These brushes G G¹ are in contact with the conductive segments or rings D¹⁸. G³ G⁴ indicate conductive lines extending to any suitable 40 power source.

Mounted on the field assembly, as upon the abutments H are a plurality of fan elements H¹, in Figure 1 indicated as three in number. Mounted on the corresponding abutments H* 45 of the armature assembly are fan members H⁸, shown in Figure 1 as two in number. The fans Η¹ H³ are indicated as opposite in pitch.

It will be realized that whereas I have de50 scribed and shown a practical and operative device, nevertheless many changes might be made in the size, shape, number and disposition of parts without departing from the spirit of my invention. I therefore wish my 55 description and showing to be taken as in a broad sense illustrative and diagrammatic rather than as limiting me to my specific showing.

The use and operation of my invention are JO as follows:

I illustrate a motor in which the field structure and the armature structure are both mounted for rotation about a shaft B. It will be understood that the torque produced ^C5 by. the motor causes the armature to revolve

1,856,687 neous rotation in opposite directions, and fan elements associated with the armature structure and the field structure respectively, said elements being of opposite pitch, a normally fixed shaft on which said armature ⁷⁰and field structures are mounted, a support to which said shaft is secured and means for angularly adjusting said shaft in relation to said support.

8. A motor driven fan structure which ⁷⁵includes a motor armature structure and a motor field structure adapted for simultaneous rotation in opposite directions, and fan elements associated with the armature structure and the field structure respectively, ⁸⁰said elements being of opposite pitch, a normally fixed shaft on which said armature and field structures are mounted, a support to which said shaft is secured and means for rotatably adjusting said shaft in relation to ⁸³said support.

9. A motor driven fan structure which includes a motor armature structure. and a motor field structure adapted for simultaneous rotation in opposite directions, and ⁹⁰fan elements associated with the armature structure and the field structure respectively, said elements being of opposite pitch, a normally fixed shaft on which said armature and field structures are mounted, a support to ⁹⁵which said shaft is secured and means for vertically adjusting said shaft in relation to said support.

Signed at St. Louis, State of Missouri, this 28th day of May, 1929. ^loc

LAURENCE M. PERSONS.

the motor fills what would have been a vacuum, resulting in an increase in the efficiency of the blades. The fan blades may be set at an angle of more than 45 degrees to the ₅ transverse plane.

A particularly important application of my device is. to the delivery of air through conduits or passages, as for example in the conduits or passages employed in hot air ₁₀ heating systems. I have not indicated such conduits in the drawings, as their details are well understood and it is thought that such illustration is unnecessary.