US1194037A - kropp - Google Patents

Description

MOP?.

l MR PRQPgLLEH. AND THE LiKE.

.APPLICATION FHLEU JULYS, l914.

Patented Aug. 8, 1916.

Aiforney Saxony an c mman en lili@ `a Re..

EAR DRESDEIE',

To 1U/Ulmen t may Concern:

lie it known that i, Ginn Knorrj a citizen of the German Empire, ond resident oi Deuben, neer Dresden, in the Kingdom of l German Empire, have invent-` ed certain new :uid useful improvements in Air-Propellers and the like olf which the ii'oilowing is e speciication.

My invention relates to a device applicrible to the propulsion oi ceroplencs, and

particiihn-lj7 to i device ofthe type in which lifting surfaces wronged within e drinn are alternately `centreeted or folded and expanded or spread ont. .As constructed hitherto, sich devices eiiect the contraction of the iiiting surfaces after their working stroke, either by lneans of springs connected with rollers carrying one eiid of the respective surfacesj or by ineens of a, special opera-ting device connected ii'ith the rollers carrying the one end of the respective-enrfe'ces and serving to wind up these surfaces after their Working; stroke. Each of these old constructions is deficient in that. it fails to insure the reliable operation which is re- 3o the springs, in 'the other construction a sepeelement and quired i111 the cese oit an aeroplane; in the one construction, the :proper operation of thedevice depends on the goed quality and condition and. on the proper strength of rate complicated actuating device is necesor each driving element consisting of a-'drun1, Wi ich in devices of the present is always used in conjunction with another is provided-in e plurality of elementsv The device inventedby nie eiiords an alosolutely reliable operation, the contraction and expnsion of the lifting members or sur- 40 faces occurring automatically es the drum rotates, Without any sfiecinl additional mechanism for eiii'ecting such expansion and contraction. For this purpose, the lifting' niembers are located between the perig'iherics of two drums one of which is located within A speed.

the other, and the desired operation is ohtained simply by rotntingr 'these drums on. their respective axes, :it the suine rate of' The inner drum is arranged eecenti'i 5'0 cally Within the outer drums and thilt gior tion of the periphery or the innerfdrnm whichv moves downward (hiring the opere.- i tion, extends to or beyond the exis of tie outer drum ln the accompanying drawings have shown the application of my invention for Specification of Le .t rs Patent.

row

. vspokes IAL lo,

`zllel 'to the'other :ixles hubs 112, 13,

i i. Serial H0. sfh'.

its 'preferred purpceey 'vir/1 n, lifting' action, iigiure i h ng :i side cierre tion of ze. driving element, if 2 n horimntnl Section through the center ci? Fig. i; Fig. e, diagrammatic rcnr elevation of :in neroplzine (of the flying hoot type) in ided with two drivi that of exerting invention, this view heine' ou t Snnillersczzle than Figs. l and und Fig. #i is e detail. YView (upon :i larger ecole) showing the driving mechanism of the conetriiction represented in if`ig. $3, es seen troni above.

iiilithin the drinn l, consisting ci two rim 2, 3,huhs i? 5, spokes 6, 7 conm-:cting th' hubs-with the respective rinie: and rods connecting oneriri with the othifri tiiere arranged zt eiiizfeiicr drinn 9, c"f\'sistiiig in iilie nienner of rime l0., 1L hubs, l l 13, l and iongn idinul roos or braces 1G, The nitro o. rods S is equal to the number or rods i6; the seid rods :irc arranged in. vpatire erich coi'njjirisii si rod 8 :rnd n rod 1G, and the two rods of each pair are connected by :t liifting ineinber 17 made suitable Flexible or' textile 'fabric or oth n'nxterini. The hnhs i, ere jonrnzried upon' dining :rides 19, Secured to 'the freine i8, and seid axles :ire connecterl 'hy horizontal stays 2i, 22 respectively with nn aude para and supporting the 'irziinsinissioii chains 24:. 25 cc1ineet the hubs #i rind 5 with the linie :ind 13 res' eci\fei \j, the siirrock, engaged by seid chains heg/ing the seine ninnher ci teethg so that the two drinne will li.

in@ elements according to my GII tary speed or angular Yeioc' y. also carries :mother sprocket 26 engngcd b v :i driving" chain Q?. To the iiin'cr ends of the hubs l2, 3 of the drinn i) fare secured propeiling screws or propeliers 2S, 2) respectively oi opposite Ditch :ind so constructed :is to force nir inwzirrrlly when the drinne :irc rotating; :me to dfliver such nir to the lifting' members l?.

iillien the' flrnins L 9 :ire rotated by the chain 27', sprocket 2o? and chnins 2i, 25, noch oi1 the iiiitinje; 'e doers 17, coixsidercd :is :L eheh:7 :swings :dicht :in :Ulis which lies :it the intersection of 'the hor' html contini pinne ot' the device :nid ot tl." :chine ccnhriiiihgr the tvc rods S, "ifi of tl'mt'iizii members 17 secured thereto, which are inst in line with the corresponding inner rods 16 in the .central position shown at the extreme left in Fig.' l, will, on account of their greater linear speed, gain on or travel ahead of, the corresponding inner rods 1G which carry the inner ends of the respective lift# ing members 17 This lead oftheouter end oi the lifting members iS quite considerable even shortly after the lifting member has risen romthe central position shown at the extreme left in Fig. l, which is the fully folded or contracted position. The result is that even shortly after passing this point the members 17 tend to exert a lifting action, forming as it were pockets to catch the air and carry it around.H The lifting sur- 'faces or members 17 therefore will exert no ,lifting action only at a small portion oil' the device, say about the portion which lies to the left of a vertical plane passing through lthe axis D.

Placing the axis of movement oit the littn ing members at one eine, as at l), (instead of centrally)Y presents another important' advantage. That is to say, the linear speed ofthe inner edges (rods le) of fthe lifting members 17 at the points where the greatest eliiciency is obtained (extreme right in Fig. l), is materially greater (owing to the greater distance or radius) than if the said axis were for instance coincident with the aXis of the drum l. The result is that the center of pressure of 'the air-,resistance is brought as far as possible Alioiii the `center of the lifting members, and thus i obtain a very eiiicieiit lifting action of said members.

The screws or propellers 28, 29 may be ar ranged outside of the two drums l, 9 instead of inside as shown. Provision may also be' made for stopping one or the other ot these screws, so that thec one screw remaining in operation will have the function, not only of Yforcing air into-the drums l, 9, as explained above, but also of propeliing the body (aeroplane) which carries the device.

In Fig. 3 l have shown the general ar rangement of an aeroplane (flying boat) 4provided with my improved driving or prop'elling device. .The frame 18 is secured to the .boat hull 3l provided with landing Wheels 3() and carrying at each. side one or more pairs of driving elements l, 9. Within the hull 3,1 is arranged the main shaft 32, operated say by an internal combustion motor vand transmitting its motion by mea-ns of a chain 33 to a. sprocket Wheel 54 and to its shaft 35. The latter actuates adifferential gearingBG; this on one side operates a spur- Wheel 37 .mounted loosely on the shaft 35 and meshing-With gear 38 on the shaft of which is also secured a sprocket 39 operating the cha-in 27, while on the other side of the differential gearing there is a sprocket 420 likewisel loose on the shaft'. 'On' the tively. The shaft 35 further carries the main .propeller 45 of the aeroplane or flying boat.

Vith the arrangement shown in Figs. 3 and 4, if a current oif air should strike only one of the pairs of driving elements l, Q and impede or retard the operation oit this pair, an equalization is obtained immediately by 'the automatic action of the did'erential gearing Which in this case will cause the corresponding pair oi elements l, 9 on the other side or' the aeroplane to be accelerated oi' speeded up. This action, to `Wit, the-acceleration of one pair of lifting or driving elements relatively to the other pair driven by the same differential, may be obtained at any time at the operators Will, by applying one of the brakes i3 or dei. The transverse oi' lateral stability et" the aeroplane is there fore ver f O'reat both. as to automatic cone device will.. operate as a Various modifications may be inade with# out departing from the nature oit my invention as set forth in the appended claims.

l claim as my invention:

l. A. device ci' the class described, comprising two drums of diilerent diameters, one located Within the other eccentrically, aconnection between said drains whereby they are compelled to rotate in unison, and ilexible connecting members or surfaces entending from one drum to the other and adapted to be expanded and contracted alternately as i the drums rotate.

2. A. device oi' the class described, com prising two drums ot' different diameters, 'one located Within the other eccentricaily and reaching .at least to the center of the larger drum, a connection between said drums whereby they are compelled to rotate in unison, and *flexible connecting mem-' bers or surfaces extending from one drinn to the other and adapted to be expanded and contracted alternately as the drums rotate.

3. A, devicel of Jche class described, comprising two rotary members, one located Aeccentrically Within the other, a connection between said members 'whereby they are compelled to rotate in unison, and ileXiole connecting members or surfaces extending from lli) ine/noe? one rotary member to the other and adapted to be expanded and contracted alternately as said members'rotate.

4. A device of the class described, comprising two rotary members, one located ec centrcally Within the other, a connection between said members -Wliereby they are compelled to rotate-in unison at'the same angular velocity, and iiexible connecting membersfor surfaces extending from one rotary member to the other -and adapted to be eX- l an operative connection' between tbe two drums to compel them to rotate in unison, and exible members or surfaces having their respective ends secured to corresponding longitudinal rods of the two drums.

6. A device ot the class described, provided with members arranged to rotate about parallel axes, connecting members of iexible material extending from one rotary member to the other and adapted to be expanded 4and contracted alternately as said members rotate, and means for directing a fluid toward said connecting members.

ln testimony whereof, l have signed this specification in the presence of two subscribing Witnesses. l u

' y CARL KROPP. Witnesses:

L. A. BnRGHoLz, PAUL Anims.

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