US 1892930: "Jan. 3, 1933. ZZZ P. V. BURMAN IMPELLER FOR BLOWERS Filed Feb. 3, 1930 118 (OCR)"

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Patent Title: Jan. 3, 1933. ZZZ P. V. BURMAN IMPELLER FOR BLOWERS Filed Feb. 3, 1930 118 (OCR)
Patent Number: 1892930 Filing Date: Jan 01, 0001
Application Number: Issue Date: Jan 03, 1933
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Jan. 3, 1933. ZZZ P. V. BURMAN IMPELLER FOR BLOWERS Filed Feb. 3, 1930 11892@930 Inven@top

Patented Sam. 3, 1933 l@8929330 UMATED STATES PATENT OFFICE FRANZ V. BUP.XAN, OF ST. PAUL, MINNESOTA IMPELLF,R FOR BLOWERS Application filed February This invention relates to fans or impellers and has for an object the provision of a simple, highly efficient impeller which is perf ectly balanced and centered and which will operat6 noiselessly. It is a further object of my present i-nvention to provide an impeller of the type havine a miiltidlicity of eircumferentially arra@nged blad@s wherein the body, fraine and nO blades are integrally formed and accurately constiucted from a single piece of material. Most impellers used at the present time for ventilating systenis, oil burners and analogous uses have been objecti6nably noisy, due 15 to the fact that the balance aild centerincy havenotbeenperfect. Castin(rof anintegral el impeller including the frame and blades has been attempted and has been found entirely unsatisfactory, since the blades and othei- 20 portions will vary somewhat in thicl@ness and consequently in weight. Many impellers comprise a, ilrame or body and a multiplicity of independent blades rigidly attached to the body. It is practically impossible in such 25 structure to secure all the blades at the same angulation and the same distance f rom the center, and it is usually difficult to perfectly center the hub with reference t6 the bodyMoreover, independently attached impeller 30 blades, in many instances, becorne detached from the body or frame of the impeller due to the citect ol centrifuoal f orce and are projected through the air with much violence, often causing considerable dama-e. 35 A further object of m invention is to overconie the above noted o ,@jections and to -provide an impeller, the body and blade; of which are pressed from a single sheet of material, whereby the device will be perfectly 40 centered and balanced and each blade identical in structure and an,-ulation, si-nee all blades are cut and pressed by the same die. Another object is to provide a compara- 3,1930 . Serial No. 425,438. cie nt method for mal@in- an inte,ral im- pel ler of the class above described. These and otlier objects and advtnt,a,(,Yes of the invention will be f ully set forth in the f ollowin- desci-iption made iii coniiectioii 55 tn wit h the accompanyiii- di-aiving lvherein lil@e ref ererice cliaracters refer to similar parts thr oughout the several views, and Nvlierein; F ig. I is a front elevation of the intalce of a blower having iiiy impeller n-ioLinted 60 the rein; F ig. 2 is a vertical section talieii on tlle line 2-2 of Fi(@. 1 ; F ig. 3 is' t detail view slioivin(, a fra,- me nt of the iiiipeller in front elevation- " 65 F ig. 4 is a fragmeiitary side elon,ation of niy impeller detaclied, t portioii of the rein- for ced azid turr,@,,d outer ed-e of the body bei no- bi@ oken away; and- F lig. 5 is a side elevttion illusti,atin(- the 7 0 t, ste p of iny method, wliieli consists in loncl- L@ tud inally slitting a syiiiii-ietrical perfectly ce ntered pan-shaped body. As shown in the drawizi,, my impeller is t, mo unted in a conveiitioiial blower casing, 75 co mprisin- telescoped sliell sections 5 and 6, said shell sections being constructed to af - for d a spiral passage sui@i-oundinu the blower an d terminating in a diseliar,-e 7. The shell sec tions 5 and 6 are rigidly secured to a base 80 8 by suitable means, such as a pair of angle bra ckets P and 10, spot-welded or otherwise rigi dly connected with base 8 and with the ext erior of the shells. Shell member 5 car- rie s a symmetrical converging intake cas- 85 ing 11, which, as shown, is provided with an out wardly projecting annular lip Ila. A suit able electric motor M is mounted rear- wa rdly of the shell 6 and secured to base 8 e shaft 13 of said 90 with the intake ithin the center ells 5 and 6. My 45 ti-vely inexpensive and efficient impeller mpeller is xe to armature shaft 13 and ssed from a symnietrical pan- shaped disposed substantially centrally of the blow- 95 Eor"dy, wherein the portions of the body be- er casing and c'oncentrically with the intake @tween the several pressed blades will be en- casing 11 and directly therebehind. tirely unobstructed to permit free passage My impeller is constructed from a single of air. sheet or disc of material, such as sheet metal 50 Another object is to provide a, simple effi- and the rnaterial is first presse,d or spun to 100

form a perfectly symmetrical pan-shaped body; preferably being tapered froin its edge to its base. The base 14 of my impeller is provided with a perfectly centered circular hub-receivi .Lng aperture 14a and a series of relatively small eircumferentially spaced at- tachment apertures (as shown, four in num- ber) surrounding said hub-receiving aper- ture. If the body is die-pressed, the base is 10 preferably formed flat by the die and the hub-receiving ap I erture and attachment apertures are @precisely positioned and formed by the die in the pressing operation. The body so formed is next preferably jr, placed on a spinner and the base 14 is spun in the shape of a cone projec@ting inwiirdly toward the peripheral edge of the body. During the spinning operation, I also prefer to turn the edge of the body iiato a reinfore- 20 ing,bead X. It will, of course, be understood that my method is not limited to the @tep of spinning the base or die-pressing the body, but that the pan-shaped body may be formed from sheet material by any suitable means 2r, whereby the body is perfectly balanced, symmetrically formed and the hub-iecelv'mg aperture perfectly ceiatered. The pan-shaped body so form6d is next progressively rotated and at each rotative step 3o a suitable die slits the body longitudinally from a point adjacent its rim to a point a,jacent its base and simultaneously presses inwardly a relativqly iaarxow portion of the stock to form oneof the blades 15, the angu- 35 lation of the blades being determined by the shape -of the die and the width of the blades bein@ determined by timing and actiiating mecha.nism for progressively rotating the body before each operation of the die. The 4o blades are of concave-convex cross section with their concave sides disposed inwardly of the body and are so formed in the,@tep of my method above described. ' In the steps of forming the blades, the material at the con- 45 nected ends of the blades is -drawn by the die so that it will not break or separate but will leave curved webs 15a and 15b at the ends of the blad6s. The material of the body is only severed along straight lines extending 50 lonoitudinally of the body aiad eircumfer-entially, thereof. After, the blades are slit and pressed out, the body may be progressively run through the die again to p6rfect the shaping of the lilades and their inclinatioli. li5 The portions of the body between two slits are skewed by the die or angled with, respect to the peripheral edge of the body, and since they are pressed and die-made each oiae will be a perf-ect r@plica of the other. ao A hub is f ormed for the body and is pref erably made on a serew machirie to insure perfect symmetry, balance and centering. Ti@s hub includes a heavy sleeve which is provided with a@ threaded radially extending channel in which a set screw is disposedf6r fixing the hub to the motor shaft 13. The hub also carries a symraetrical truncated conical flanlre or skirt which has an annular abutment sl@oulder Rdfa@ent its restricted encl and this skirt precisely fits the restricted ppr- 70 ti6n of the truncated conical base of the im- peller,body, the peripheral edge of the aper- tured portion of said base abutting the shoul- der and the base being secured to the flange or skirt by suitable means, such as bolts dr riv- 7t, ets 16 which extend through the attachment apertures in base 14. From the foregoing description it will be seen that a very perfect impeller can be made from sheet material at exceedingly low cost, 80 and that the angulation of the multiplicity of blade , as well as the weight and shape o the blades, will be identical since the impeller is dieformed. Itfurtherwillbe,apparentthat the impeller will be perfectly centered, and 85 consequeni;ly will oper@te efficiently and prac- tically noiselessly, and can never throw a blade. One' of the most important features of my invention is that the body of the impeller i 90 comparatively unobstructed, thereby effect- ing the displacement of a relatively great amount of air in comparison with other in@@ pellers of the Sirocco type. It will be noticed that no material of the body extends between 95 the blades nor are the blades provided with any flanges or other obstructions at their lon- gitudinal edges. This is due to the fact that the blades are slit longitudinally from the material of the body and the slit portions 100 tiirned on their longitudinal axes, the only connections of said blades with the b6dy be- the webs 15a and 15b at their extremities. @ns9has been stated, the material of the body 0,; is only severed filong straight lines exten ing longitudinally thereof aiad the material is drawn at the ends and no rib or reinforcement meriiber obstructing the passages between the blades is necessary to support the same. The passage of air radially and out- iio wardly of the impeller is only obstra@ted @y the thickness of ihe sheet material, which is almost nelrlip-ible. Due to fh@-structure and advantages above described, my impeller has been found to have 115 much greater capacity and effieiency than other sheet-metal impellers known to me at this time. . It will, of course, be understood that va@. rious changes may be made in the forin, de- 120 tails, arrangement and, proportions of the parts without departing from the scope of my invention. Nnat is claimed is: 1. An, impeller comprising a syMMetrical i25 rim constructed of sheet metal and provided with a series of longil-ludinal slits interme- dia-@,,e its edges, the portions of said rim be- tween said slits being bent out of the curve 'of said rim providing spac'ed blades connected 13o

with the rim only at th6ir ends, the ends er the bent portions between said longitudinal slits being uncut and drawn in said bending to form triangulai-shapled ends for the blades angled with res@ect to the main por,+,ions o@ the blades and bent out of the peiiphery of tl-ie rim. 2. An impeller comp I rising a. syrametrical annular rim constructed of. she6t metal and 2o provided with a series of longitudinal slits intermediate its ends, the entire portions of ,the material of said rim beiween said slits being bent out of the curve of said rim to p@ovide spaced blades connected with -the rim n5 oniy at their ends, the ends of said blades b@eing integrally connectecl with said rim throughout their entire widths and being drawn in the b@-nding of said blades to form triangular-shaped connection portions angled 20 with respect to the main portions o'L the blades and bent out of the peripher.7 of the rim. In testiinony whereof T afflx my signature. 25 FRANK V. BU-RYILAN. ,3 rD d5 so or], so

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