US 2512159 A
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June 20, 1950 G. H. KOCH AIR TRANSLATING APPARATUS 3 Sheets-Sheet 1 Filed March 15, 1947 INVENTOR Gus'rnv H. KocH ATTORNEY WITNESSES. 5. 14. LIE \xw AL Q? June 20, 1950 G. H. KOCH I 2,512,159
AIR TRANSLATING APPARATUS Filed March 1:5, 1947 :5 Sheets-Sheet 2 FIG-.2.
INVENTOR Gusrnv H. KocH A ORNEY June 20, 1950 KOCH 2,512,159
AIR TRANSLATING APPARATUS Filed March 15, 1947 3 Shuvts-Sheet 3 Pic-L3.
F I G; 4.
WITNESSES: INVENTOR 6.34. .Gusmv H. KOCH ow. MM, M
ORNEY Patented June 20, 1950 2,512,159 AIR TRANSLATING APPARATUS Gustav H. Koch, Springfield, Mass, assignor to Westinghouse Electric Corporation, East Pittsburgh, Pa., a corporation of Pennsylvania Application March 13, 1947, Serial No. 734,517
11 Claims. 1
This invention relates to ventilating fans, and more particularly to an electric ventilating fan of the type mounted in a wall box or duct.
In designing an electric ventilating fan of the wall box type for household use, such as a relatively small exhaust fan to be employed for improving the ventilation of a kitchen, it is desirable to provide simply and sturdily constructed means to enable mounting of the fan unit in place at minimum expense. Such a mounting means should also be .constructed and arranged to facilitate ready accessibility of the fan unit for cleaning, in view of the tendency of an exhaust fan to accumulate a deposit of grease and soot during operation in ventilating a kitchen or the like.
It is a principal object of the present invention to provide an improved ventilating fan assembly of the household type embodying the desirable features of construction just mentioned.
Another object of the invention is the provision of an improved fan assembly including a novel mounting frame structure constituting a convenient means for supporting the fan while in use and for facilitating the removal of the unit from the wall box for cleaning.
A feature of the invention is the provision of an improved ventilating fan assembly comprising a fan motor housing having complementary casing sections, and a supporting frame including an inner member engirdling the motor and clamped between the casing sections and having substantially radially extending strut portions for mounting the assembly in place.
Still another object of the invention is to provide an improved ventilating fan and mounting frame assembly as just described, which may be equipped with a convenient operating switch device supported on the frame and thus facilitating mounting of the entire assembly as a unit in a wall box.
It is a further object of the invention to provide an improved ventilating fan structure of economical design which may readily be manufactured and assembled by mass production techniques at minimum cost to produce a sturdy and eflicient operating unit having a long service life.
These and other objects are effected by my in vention as will be apparent from the following description and claims taken in connection with the accompanying drawings, forming a part of this application, in which:
Fig. 1 is an isometric or perspective view of a wall box and ventilating fan assembly embodying features of the invention;
Fig. 2 is a somewhat enlarged side view of the 66- wall box and fan assembly shown in Fig. 1, certain portions thereof being shown in section;
Fig. 3 is an exploded view, of the component parts of a fan motor and mounting frame structure constructed in accordance with the invention, and illustrating the method of assembly thereof;
Fig. 4 is a front view of the mounting or carrier frame of the assembly shown in Fig. l, illustrating association thereof with a wall box or duct;
Fig. 5 is a fragmentary sectional view taken along the line V-V of Fig. 4; and
Fig. 6 is a fragmentary sectional view taken along the line VIVI of Fig. 4.
As shown in Fig. 1 of the drawings, the improved ventilating fan assembly embodying features of the present invention is adapted for an sociation with a wall box or duct indicated generally by the reference character I which may be mounted in any suitable manner in an aperture provided in a wall of the kitchen or other space to be ventilated. The wall box or duct preferably comprises a cylindrical section 2 having interior and exterior openings, the exterior opening of which may be provided with suitable door or other closure (not shown) supported on an integral flanged plate 3.
As shown in Fig. 2, the interior opening of the cylindrical section 2 of wall box I may be screened by a closure member or grill plate 4, which is adapted to be secured in place in a manner hereinafter explained. Adjacent this interior opening, the cplindrical section 2 of the wall box is provided with a number of mounting lugs or tabs 5, each of which is welded or otherwise secured to the interior wall of the cylindrical section and has an inwardly extending portion provided with a threaded bore 6.
As shown in Figs. 2 and 3 of the drawings, the fan assembly includes a motor 1 for driving a fan or propeller 8 and supported within the wall box I by means of a mounting frame 9. The fan motor 1 comprises a pair of complementary casing sections 10 and II which are adapted to be secured in assembled relation by means of a plurality of through bolts 12 and associated nuts 13, for which suitable recessed openings are formed in the two casing sections. Mounted within the assembled casing sections I0 and l I is a stator 14, which is disposed in cooperative alignment with a rotor I5 carried by a shaft l6 that is journaled in bearings l6a and lBb, mounted in the respective casing sections. One end of the shaft l6 extends outwardly of the casing section I l and carries the propeller 8. It will be understood, of
course, that the construction of the motor I is not illustrated in detail, the elements identified 'having been mentioned in order to facilitate proper understanding of the invention.
According to the invention, the mounting frame 9 is preferably made of stiff wire or light bar stock, and comprises an inner annular portion or ferrule H, a pair of concentricall disposed substantially rectangular outer portions or bails l8, and a plurality of substantially radially disposed strut portions [9 spaced in pairs for connectingthe bails l8 to the ferrule IT. The outer bails l8 are similar in size and preferably made substantially rectangular in form. with flattened corner portions l8a disposed approximately 90 degrees apart, as best shown in Fig. 4:. The strut portions is are similarly spaced substantially 90 degrees apart with the inner ends thereof contiguous to and welded to one side of the ferrule !l The outer ends of the respective pairs of strutportions I9 are bent slightly out of alignment, one end of each pair beinginterposed between and welded tothe separate, bails l8, and the endof the adj acentstrut portioniof each pair being welded to the outer side of oneof the bails.
The frame assembly 9 is adapted to be combined with the casing elements of the motor. 1 to form a unitary structure, which may easily be handled and mounted in an suitable position while affording maximum protection to the motor and fan. As isbest illustrated in Fig. 3 of the drawings, the inner annular portion or ferrule ll. of th frame assembly is of substantially the same diameter as the complementary casing sections H) and! i, so that assembly of the unit may readily be accomplished by first mounting the stator 15,.rotor l5 and shaftlfi in the casing section Hl, after which the ferrule i! of the frame assembly may be placed adjacent thereto arid finally clamped between. the two casing sections by means of the bolts l2. It will be noted. that suitable notches are formed in the abutting edge of the casing section Hi to receive therespective ends of strut portions i9 overlapping. the ferrule ll of the frame assembly, when the parts are assembled.
Referring again to Fig. 1, it will be notedthat the construction and arrangement of the strut portions E9 of frame assembly 9, with the ends of four such strut portions welded between the bails l3 and the ends of the alternate strut portions welded only to the inner bail, provides a motor carrier structure which may be conveniently mounted within the wall box 5. With the frame, assembly 9 tiltedangular-ly to enable corner portions l8a ofthe inner bail. l 8" to. pass the respective lugs 5', the frame assembly may be inserted into the cylindrical portion l of the wall box and. turned in. clockwise direction. asviewed in. Fig. l, to cause the four corner portions. [8a to slide over the lugs5, whichthen occupy the spaces between the bails 53 and between thestrut portions; of the respective pairs. Referring. to Fig. i, itwill be seen that with. the frame 9 thus mounted in wall box I, and properly centered therein, the threaded bores 6 of thelugs- 5 will be exposed inwardly of the corner portions of bails IS.
The frame assembly 9' and fanmotor 1- are then adapted to be secured in position within the wall box 1 upon attachment to'the wall box of the interior closure plateor grill 4, Which-is provided with suitably spaced apertures 4a: (see Fig. 6)- for receiving screws 20 designed for engagement in therespective threadedboresfi ofslugsi.
The grill may be of any suitable construction, and may consist of either a punched sheet steel plate or a die casting provided with louvres or small apertures. The grill 4 is preferably provided with a peripheral flange of suflicient width to overlap the interior edge of the cylindrical portion 2 of the wall box, as shown in Fig. 6, thereby contributing. to theappearance of theapparatus when installed.
In order to facilitate the electrical connection of the fan motor 1 to a suitable power supply, an outlet fixture 2| is provided in the lower wall of the cylindrical portion 2 of the wall box for receiving a plug 22. of the usual detachable type connected to amotor terminal conductor 23, as shown in Fig. 1. An operating switch device of suitable construction may also be associated with the motor 1 and may preferably be housed withina tubular element 24 made of a non-conducting composition. As shown in Figs. 1 and 2 of. the drawings, the switch housing 24 is..ar ranged in a vertical position and is supported on a bracket 25, the lower end of which is secured to the bails I8" by means of bolts 26. In order to provide further support for the switch housing 25, the upper end. thereof is provided with a groove Zl through which extends a horizontally disposed strut 28, the opposite ends of which are welded to two of the radial strut portions of the frame assembly 9. With the switch housing 2% thus mounted as an integral element of the frame assembly 9 and motor 7, mounting of the apparatus in the wall box is facilitated, since the only electrical connection. that needbe made consists in insertion of the plug 22 into the outlet fixture 2 I.
From the foregoing, it will now be apparent that a ventilating fan. assembly having features of the invention is adapted to be manufactured and assembled. at low cost, and can readily be mounted in awall box and secured in place with out special tools or fixtures. Although the fan assembly, when mounted in the wall box, may be expected to. operate throughout a long service period without attention, when inspection and cleaning become desirable, the entire fan unit cluding the frame assembly and motor may easily be removed from thewall. box and safely handied during the cleaning operation and afterwards replaced in the wall box with minimum effort. It will further. be recognized that the novel features of construction of motor 7 and the associated carrier frame 9, enabling. treatment of these elements as a unit, may readily be adapted. to a variet of purposes other than that of association with a wall box as hereinbefcre disclosed.
While I have shown. my invention in but one form, it will bev obvious to. those skilled in-v the art that it is not so limited, but is susceptible of. various changes and modifications without departing from. the spirit thereof.
What I claim is:
1. In an electric fan. assembly,incombination, a fan motor having complementary casing sections containing stator and rotor elements, and a supporting frame therefor comprising. an'inner ferrule portion adapted to be clamped between said casing sections, an outer bail portion, and a plurality of radial strut portions connecting said ferrule and bail portions.
2. In anelectric fan assembly, in combination, a' fan motor having complementary casing. sections containing stator. and rotor elements, and a supporting frame therefor comprising an inner ferruie portion adapted to be clamped between said casing sections, and a plurality of substantially radially disposed carrier strut portions projecting outwardly from said ferrule portion.
3. The combination with an electric motor having complementar casing sections, of a wire mounting frame assembly comprising an inner ferrule member adapted to be clamped between said casing sections, a concentrically arranged pair of spaced bail members surrounding said ferrule member, and a plurality of pairs of strut members disposed in substantially radial alignment with the inner ends thereof secured to said ferrule member and outer ends thereof secured to at least one of said bail members.
4. The combination with an electric motor having complementary casing sections, of a wire mounting frame assembly comprising an inner ferrule member adapted to be clamped between said casing sections, a concentrically arranged pair of spaced bail members surrounding said ferrule member, and a plurality of strut members disposed in substantially radially aligned pairs having inner ends'secured to said ferrule member and outer ends spaced apart and contiguous to said bail members, one outer end of each pair of strut members being secured between and jointly to said ball members, and the alternate outer end of each pair being secured to only one of said bail members.
5. In an electric fan assembly, in combination, a fan motor having complementary casing sections containing stator and rotor elements, a supporting frame therefor comprising an inner ferrule portion adapted to be clamped between said casing sections, an outer bail portion, and struts connecting said portions, and a switch housing entirely supported on said supporting frame in association with said fan motor.
6. In a ventilating fan assembly, a wall box having outlet and inlet openings, a fan motor having complementary casing sections, a supporting frame including an inner annular portion and strut portions extending radially therefrom, said inner annular portion being clamped between said casing sections of the motor, and means for removably securing said strut portions of the frame to said wall box for supporting said motor between said inlet and outlet openings.
7. In a ventilating fan assembly, a wall box having inlet and outlet openings, a fan motor having complementary casing sections, a supporting frame including an inner ferrule portion clamped between said casing sections, a pair of spaced substantially rectangular bail portions, and strut means joining said ball portions to said ferrule portion, a plurality of lugs carried within said wall box and adapted to be received between said bail portions of said frame, and means for locking said bail portions to said lugs.
8. In a ventilating fan assembly, a wall box having inlet and outlet openings, a fan motor having complementary casing sections, a supporting frame including an inner ferrule portion clamped between said casing sections, a pair of spaced substantially rectangular bail portions, and strut means joining said bail portions to said ferrule portion, a plurality of lugs carried within said wall box and adapted to be received between said ball portions of said frame, and a closure member for said wall box adapted to be secured to said lugs in engagement with said bail portions of the supporting frame.
9. The combination with a motor having complementary casing sections, of a mounting frame assembly comprising an inner ferrule member adapted to be clamped between said casing sections, a plurality of strut members secured to said ferrule member and disposed in pairs extending substantially radially thereof, and a pair of spaced bail members arranged concentrically of said ferrule member, one of each said pair of strut members being disposed between and secured to both said bail members and the other being secured to only one bail member, thereby defining, adjacent the respective pairs of strut members, spaces between said bail members closed at one side by the intermediate strut member and open at the other side.
10. In a ventilating fan assembly, a wall box having inlet and outlet openings, a plurality of lugs secured Within sald wall box, a fan motor having complementary casing sections, a supporting frame including an inner ferrule member clamped between said casing sections, a pair of bail members arranged concentrically of said ferrule member, and a plurality of strut members joining said bail members to said ferrule member, said strut members being arranged in radially disposed pairs, the other end of one strut member of each said pair being interposed between the bail members and the outer end of the other strut member being secured to only one of said bail members, whereby a plurality of lugreceiving spaces are provided between the strut members of the respective pairs, each of said lugreceiving spaces having an open side through which one of said lugs can enter said space.
11. In an electric fan assembly, in combina tion, supporting means, a fan motor having complementary casing sections containing stator and rotor elements, and a supporting frame therefor comprising an inner ferrule portion clamped between said casing sections, and a plurality of substantially radially disposed carrier strut portions projecting outwardly from said ferrule portion into engagement with said supporting means.
GUSTAV H. KOCH.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,739,082 Simmons et al. Dec. 10, 1929 1,843,786 Robinson Feb. 2, 1932 2,258,325 Hess et a1 Oct. '7, 1941