US2561448A - Skate for roller skating - Google Patents

Description

y 24, 1951 A. E. MURRAY 2,561,448

SKATE FOR ROLLER SKATING Filed Aug. 12, 1946 4 Sheets-Sheet l INVENTOR Alan E. Marla 17 ATTORNE:

July 24, 1951 A. E. MURRAY SKATE FOR ROLLER SKATING Filed Aug. 12, 1946 4 Sheets-Sheet 2 INVENTOR .flllazz E Marra :1 avg E A ATTORN I July 24, 1951 A. E. MURRAY SKATE FOR ROLLER SKATING 4 sheets-sheet 4 Filed Aug. 12, 1946 fatentecl July 24, 195 1 UNITED STATES PATENT OFFICE 2,561,448" 7 SKATE FOR ROLLER skArING Alan E. Murray, New York ,-N. Y. V Application August 12, 1946, serial N... 690,050

My invention relates particularly to skates adapted for roller skating of all kinds.

The object of my invention is to provide'roller skates, by means of which a far more effective mechanism for supporting the foot or body of L the skater from the rollers is available. Another mechanism. An underslung suspension isprefa erably provided for this purpose. Another purpose is to provide a construction in which the parts tend to become self-aligning. Another object is to provide achassis construction for the skate which can be partly built and completed by the wearer to suit the most desirable conditions for the individual skater. For instance,

the elastic suspension may be applied or re-;

newecl by the wearer to provide the desired degree of tension or resistance to movement desired by the wearer of the skates and the plates used" for attachment of the skate platform to the roller mechanism may be placed at will, and so as to vary, as desired, the angles to the vertical of the axes on which the two pairs of rollers, with their struts, axles and axle housings, rotate in the turning movement of the skate while skating. Further objects of my invention will be seen from the detailed description hereinafter.

While my invention is capable of embodiment in many dillerent forms, for the purpose of illus-,

tration I have shown only certain forms thereof hereinafter, which in the accompanying drawings, in"

Fig. l is a side elevation, partly in section, of

a roller skate made in accordance with my invention;

Fig. 2 is a vertical cross-section of the same;

Fig. 3 is a horizontal section of one of the axle, housings showing the mounting of the rollers thereon;

Fig. 4 is a plan view of one of the axle housings,

showing the lower elastic suspension of the body of the skate therefrom;

Fig. 5 is an enlarged left side elevation showing 12 Claims. (Cl. 280---11.28)

Fig. 7 is a side elevation similar to Fig. 5, but showing a modified form of elastic connection;

.Fig. 8 is ,a side elevation of another form of sus-- pension means that may be used instead of the embodiment in Fig.l;" Fig. 9 is a side elevation of still another modified form of suspension means that may be used;

FigfIO is a plan view of the shoe-supporting 1 plate shown in Fig. 9;

Fig. 11 is a side elevation of a shoe-support: ing plate in a modified form of the plate shown inf-fig. 9;to be used with an arched shoe;

"Fig. 12 is a side elevation showing another modification of the suspension means shown in Fig. 1;

Fig. l3is a plan view of a detail thereof;

Fig; l l is a plan View of one of the hook plates that can be used in attaching the axle housings elastically to the shoe-supporting plate of the skate;

Fig; 15 is a rear elevation, partl in section, of a rnodified elastic suspension between the foot plate and the axleihousings; Fig. "1G is a front elevation of a front bracket of another form of suspension for the axle from thefoot plate; and Fig.1? is a similar view, partly in section, showing the elastic cord windings thereon. In "the drawings, referring first to the form of my invention shown in Figs. 1 to 6, I have shown a shoe l of any desired character, having attached thereto a plate 2 of wood, inany desired way, as,

for instance, by screws (not shown). The plate 2,

two front rollers 5 and two rear rollers 6. To the bottom of the plate 2 there may be attached a strut in the form of a block 1, of wood or other material, by means of four-screws B. Said block 7 may, also, have on the opposite sides thereof curved recesses 9 and ID to provide ample room in the turning directions ofthe rollers 5 and 6. Furthermore, the block 1 may have front and rear extensions Ii and I2 thereon, through which a rod 1 3 extends longitudinally and having screw threaded ends l4 thereon carrying tapered nuts i5,|6,l1 and I8.

The rod 13 is'underslung beneath axle housings l9 and 20 having therein axles 2| and 22, to provideaxial support for the rollers 5 and 6. As shown in Fig, 4, the axle housings l9 and 20 are then secured abovethe rod l3 by wrappings of a cord '23 of rubber or rubber substitute about in diameter under tension, or some stretcharound the axle 2| and the screw-threaded end: of the rod l3. For this purpose there is first ap,-.

plied a spaced spiral wrapping 24 extending 'be-'- tween the nuts I5 and I6 and thenasimilar "or-2 second wrapping 25 above one half of the first wrapping between the housing ['9 and the'nut'" l6, towards the middle of the skate. Then athird series of about three diagonal wrappings 26 are made around. the. axle housing is and the rod end-l4, and'tjhena' fourth seriesof about three similar diagonalwrappings'z'l at right angles'to thejtwrappin g 25, These wrappingsj and 26 will pullthe'h'ousin'g l9 and'rodendfM together. Then there are applied a fifth" series of about five hori'zontal' wrappings 28, to format neck of thef' wrappin'gs betweenthe housing 19 and the rod end 14. This tends to pull-down a hook 29,

which forms a part of an axle hood including the housing 1 9. While 'I may u'se'the hook 29 forthis purpose, itis to be understood that any other eyemember may be used instead of a hook wherever I have mentioned herein a hook. Then there are applied a sixth series of about three or four wrappings 363, each horizontally towards the front around the hook-29 (there being a corresponding oppositelyfsupplie'd rear hook 3] on the housing ZO 'aTnd then down behind and underneath each side of the axle'housing l9 and again horizontally around the front of the hook 29. to make thesaid three or: four wrappings,..so as to pull th'hook 29 upwardlysomewhat to give it a di-.

rection inclined towards thefront for the front axle andtowa s meo t e e ax e at an'angle of about 10 to the vertical, or nearly vertical, for ordinary and fancy skating, but preferably at a still greater; angler'to; the vertical for speed skating (see Fig". 5') althoughany other angles can be 7, chosen. -Thereupon I apply a seventh-series of crossed diagonaljwindings, each of about ten diagonal wrappings 32, 33, and theremay be alternated .repetitionsof these crossed:

diagonal windings indicated diagrammatically at 32, 33 until, around tl' ecro'ssedhousingv t9 and the rod hi, there are. about six. layers of these alternating. crosseddiagjonal. windings..- Then there are applied an eighth set of figure-.8 windings 34,35, the. figure-3 windings 34, about ten in number, being looped under the rod end: 14 fore and aft and crossed above the housing l9, and the figure-8 windings 3-5, about tenin-nurm. her, being looped under theaxle-housing l9 and crossed above the axle housing I3. Finally,.there can be added on the. outside a ninth. set of alternatin'g diagonalwrappingslike thewrappings 32, 3.3 ,with more orlessof the wrapping's 32 or- 33 in one direction, to make'the distance between the right side rollers. equal to the distance'between the'left, side rollers.

It will be noted from Figs. 1,. 5, 6 and 14, that the book 29 is attached at theifro'nt and rear of the skate to a hook 35, secured to a plate 36 attached to the wooden plate 2 by screws 31 passe ing through; slots'38 so that, if desired, by'the lateral adjustment of the plates 31 the four rollers 5 and 6 can be adjusted so as to occupy the same horizontal plane. The hook 29 can be secured to the hook 35 to suspend the latter, by further wrappings of a cord or cords of rubber or rubber substitute 39, or both, preferably a rubber substitute underneath and rubber outside. Also, as shown in Fig. 6, the hook 35, at the front or back of the skate, or both, will preferably be located to one-side -or the othen as desired, of the hook 29, before applying the \vrappings thereto.- Metal contact between the same is avoided by the position shown in Fig. 6, of the windings applied thereto. A first series of about three to five windings 4!! is applied vertically around the two hooks-'29 and 35 to bind them together. Then a second series of about five or six windings M, which actually spread the hooks apart as in Fig. 6, is applied-horizontally around the windings 40. Thereafter, a third series of windings 42, like thewindings- 40,1 applied; Finally a fourth series of abouttwentywindings43 is applied; hon-.- zontally, like-the windings 4;l The windings 43, o theind n s or bot serve to separatethel two-hooks; 2s-and 35 to preventmetal to metal. ont c Asshowm-in Fig. 1, amodifi'ed form of adoue hie-hook 44;,inthe; place of the hook35, can b'e used so to have two laterally directed strad dlingshooksi=45 and' 46,: which may be each attachedto the hoo'k 29 bysimilai wrappings tothose applied'to the hooks 29. and 3 5, as for in stance; "alternating layers of, each, about five windings .41 and 48 =going around "the hook 29- andrthehook45, and around the hook 29 and *the} hook' ldrespectively; Eas well as a" series of about twenty. horizontal windings wgoing between thehook 29 ahd thehooks '45 and to separate the hooksr-ziIn this -wam thestraddling of the hook 29 by the hooks '45 and 46 provides a suspension by the-latter from the hook-29.-

As shown in Fig? l5,"stil-l a other'form of hook 53, whichis arranged transversely of the foot, maybe p rovided'in the place of the book 35 In, this instancethe hook-29 passesthrough the hook, 5H "and, if desired', 'th e latter: may, but not necer. sarily,-have thereon a preliminary winding 5 of a rubber-or rubbersubstituteoord. Also, this oranother similar cord maybe applied to bind the. hooks 2,9 a'ndfifitowards each other by provid-. ing; first, alternatingjlayers of about'ten each. of crossedflayers'of windings 52"a'nd 53,, 'as shown, in Fig. l5,v each; layer-being. arranged to go. through bothhooks-iilfand' 56. so that in use, when skating, the foot, becomes suspended from the hooks 29 bythe'fhooks 5B." 1

Each of the axlesf'zi and. 22,} which are con structed alike, preferably has scorings .54 onthe, middleportionsojas to, firmly position them in theirrespeotive housings i9, '20. Besides,; the. ends of. the axle are screw-threaded to receive t eo conicalfim er and outer ball. races- 55 56 to support series of bearing balls 5? and58. so, 15. to cooperate with roller races 59, and 6.3 on a sleeve 3| fastened in; each rollerE, a'ndfi. Outside, the outer racesa 53, there is, a..D.-shaped washer 62' "cooperating with a flat area 63 on the undere. side of theaxle 2H,: 22 Outside. of the ill-washer EZTtl'iere is a nut Mjto secure, each or" the rollers 5 and 6 from lateral displacement onits axle. If desired, there maybea fibreoil-g-uard 65:10- cated between each ihnenballrace 55and the ad jacent part of'the'hoiising 1.9,2 3 -Also,.if desired there maybe .applietit'o, the outside ofeach of the rollers 5 and 6 a dust screws 61.

As illustrated in Fig. 8, I have shown another form of suspension means instead of the block I. In this instance, instead, I have shown two cylindrical hollow metal standards or struts 68 and 58a, having circular plates 69 and secured thereto, which are fastened by screws II to the wooden plate 2. These cylinders 68 and 58a are closed at the bottom by welded caps 12 and I3 and are provided with lower front and rear flat circular areas 14 through which the rod I3 passes, and is provided with long screw-threads and 15 to receive tapered nuts I] and I8, in addition to the tapered nuts i5, I5, I! and I8 previously referred to.

A variation of the construction in Fig. 8 is cap 66 by means of shown in Figs. 9 and 10, in which the construetion is the same as in Fig. 8 except that instead of the unitary rod I3 there are a longitudinally adjustable front rod I9 and a longitudinally ad-.

justable rear rod 80. Also, in this instance there are welded to the inner ends of the rods 19 and 80, hooks BI and 82 respectively, and around the two hooks, through the eyes thereof, there are a first layer of about ten horizontal windings 83 of said rubber or rubber substitute cord, and a second vertical layer 84 of about ten windings thereof, which prevent metal to metal contact and strongly return the rods 79 and 80 to their alignment from any variation thereof during skating, due to any flexibility in the shoe I, made of leather or molded from rubber and fabric or rubber substitute and fabric materials. If desired, there may also be provided a similar attachment comprising hooks 19a and 80a attached to the standards 68 and 68a, said hooks having elastic cord windings 84a like the windings 84. In this form the flexibility movement is aided owing to the plate 2 being substituted by a twopart plate 85 and 86, between which there are two rubber or rubber substitute blocks or plates 81 and 88 attached, respectively, to the inner adjacent ends of the two- part plate 85 and 86. Said inner ends of the plates 85 and 86 are bound together by a rubber or rubber substitute cord 89,.

of the above character, which passes through holes 99 and 9| in the two plates 85 and 86, respectively.

In Fig. 11 I have shown another modified form of suspension which is similar to that just described in connection with Figs. 9 and 10. In Fig. 11, however, instead of the two-part plate 85 and 86 I may use a flexible platform 92 of laminated wood or laminated fabric and rubber or a rubber substitute, to which the standards 68 and 68a, for suspension of the foot, are attached, when wearing an arched shoe 93. In this instance the construction is more rigid than that shown in Figs. 9 and 10. Accordingly, there may be arranged higher up screw-threaded rings 94 and 95, secured to the supports 58- and 68a, respectively, to receive the screw-threaded ends of hooks 95 and 97, respectively. These hooks 96 and 91 may be bound together, yieldingly, by horizontal 98 and vertical 99 windings of the rubber or rubber substitute cord, which, as in all the other instances of windings therewith herein, the windings are applied preferably under some tension or stretching.

. In Figs. 12 and 13 I have shown still another form of suspension. This is the same as in Fig. 1, except that I provide rods I00 and I 0| which pass through and are fastened to front and rear struts or blocks, I02 and I03 respectively by the tapered.

nuts I5 and I! on the outside of the blocks I 02 and I03 and nuts I04 and I05 on the inside of said blocks. The blocks I02 and I03 are secured to front and rear wooden plates I06 and I0! by four U-shaped screw-threaded bolts I08, I109, H0 and III. and nuts Illa. The blocks I02 and I03 have adjoining tapered inner ends I I2 and H3, to provide more turning space to receive the rollers 5 and 6, which have four spherical recesses H4, II 5, H5 and I I? to receive two rubber balls H8, H9 of any desired construction, but preferably having a core or body of rubber or an artificial rubber cord, as above referred to, wound under tension. To apply further compression to the balls H8 and II9 the blocks I02 may have therein eight screw hooks I20, I2I, I22, I23, I24, I25, I26 and I21. These screws are bound together elastically in pairs I20 and IZI, I22 and I23, I22 and I25, and I26 and I21, by means of any desired number of windings I28 of said rubber or an artificial rubber cord under tension.

In Figs. 16 and 17 I have shown a modified form of elastic suspension of the axle housing and the foot plate. In this instance there is provided a bracket I29 of metal having two depending arms I30 and I3I provided with holes in their ends through which a cylindrical rod I32 passes and is held tightly, or loosely for removability therein, as desired. This makes an opening I33 through which the upper end of the hook 29 can pass, although the hook can pass below the rod I32, if desired. Four screw holes I34 are provided in the plate I29 for attachment of the latter to the plate 2. The hook 29 is attached to the bracket I29 by suspension therefrom with an elastic cord of rubber or a rubber substitute, such as that above referred to. For this purpose a first winding I35 is made around the rod I32. Then a second winding I39, of about five turns, is made diagonally over and around the middle part of the hook 29 through the opening I33 and around the rod I32 near the arm I30. Then a third winding I31, of about five turns, is made similarly over and around the middle part of the hook 29 and thence through the opening I33 and around under the rod I32 near the arm I3I. Then a fourth ticity and flexibility so as to override all unevennesses in the skating floor, without impeding the momentum of the skater due to the elastic suspension of the skater from the axle hoods or housings I9 and 20. This is particularly true due to the underslung position of the rod I3 which is suspended, without metal contacts, beneath the axle housings I9 and 29. Nevertheless, the windings of the rubber or rubber substitute cords which suspend the rod I3 from the housings I9 and 20 are such as to permit a very great aneular turning movement while providing for returning the foot and skate always to its original normal position. This suspending action, with freedom from metal contacts, is also present due to the position of the hooks 35 and 29 so that the former becomes suspended from the latter but always returns to the normal position, neverthe less. It will be understood, also, that the cord windings can be. applied by the individual skater.

to apply. the degree' of tension or resistance to movement or elasticity desired by him and that, furthermore, he may even supply his own elastic cords; axles and particular rollers carried thereon,so that he canmake the final assembly there-- of, as desired.

The same is true in the hook suspension in Fig. .7, wherein the hooks 45 and 4% become: elastically suspended from the hook 2c in skatin due to the elastic cord windings as placed thereon. This of itself gives an important elastic sus pension irrespective of the form of the attach ment of the axle housings". is and=2e to the foot, especially-as the shape of the hooks 45 and 46 always returns the hook 29 to the middle position between them.

In Fig. 8 the operation is substantially 'thesame as in Figs. 1 to 6.

In Figs. 9 and'll), the operation is similar to thatof Fig. 8, but in Figs.-9' and 10, however, there is still more freedom of action in skating due to the relative possible different rotations of the front roller 5 mountings from the rear roller 6 mountings, not only on vertical axes but also on horizontal axes due to the elastically bound rubber or rubber substitute plates 3? and 88 bound together with the rubber or the rubber substitute binding as, but also due to the hooks l9 and 85 and their elastic bindings 84, which,

however, always return the skate to normal position.

In Fig. 11 the operation is similar to that in Figs. 9 and 10, except that here there is a supporting laminated plate 92 for the arched shoe 93,which permits a torsional movement in said plate 92 one. horizontal axis and even some relative axial turning movement on said axis between the supports for the front rollers 5 and the rear rollers 6 owing to the elastic bindings as between thehooks 96 and 91.

In Figs. 12 and 13 the operation is similar to the action in Figs. 9 and 10. Here, however, the compression present in the balls i 18 and l is gives a greater resistance to displacement of the foot from the normal position of the struts 102 and E03 and a more positive return to the normal position of the skate, Also, a more free or ready adjustment of the relative positions of the sup ports for the front rollers 5 and the'supports for the rear rollers ii can be attained.

In Fig. 15 the suspension is similar to that shown in Figs. 5 and 6, but here the upper hook Ed is suspended from the lower hook'29, by'the elastic windings E2 and 53, as each of the hooks 29 and-58 passes through the other.

In Figs. 16 and 17, another efiective form of suspension of the foot from the lower hook 29 is provided in that the rod :32 from by the elastic windings I36, I31, I38 and While I have described my invention above in detail'I wish it to be understood that many changes may be made therein without departing from the spirit of the same.

I claim:'

l.-A roller skatedevice comprising a pair of rollers near each end of the skate, said skate having an axle support in the form of an axle housing carrying a hook, and a foot-supporting element having parts extending above and below the axle, an elastic cord connection from the upper part of said element to said axle housing hook and another elastic cord connection from said element to said axle, permitting'horizontal rotary. shifting of said-axle, for allowing said is suspended there' element to be suspended from theax'le elasticallmz the elastic connection between the hookbnthe axlehousing and the foot-supporting element being located at an angle to the vertical topermit horizontal guiding movement of the skate:

2. A roller skate device comprising a pair of. rollers near each end of the skate, said skate having an axle supportin the form of anaxle' housing carrying a hook, and a foot-supporting element having parts extending above and he low the axle, an elastic cord connection from: the upper part of said'element to said axle-hous=- ing hook and another elastic cord connection from said'element to said axle, permitting hori zontal'rotary shifting of said axle, for allowing said element to be suspended from the axle I elastically, the elasticconnection between the hook on the axle housing and the foot-su'pport ing element being located at an angle to the vertical to permit horizontal guiding movement of the skate andhaving a hook on' said element: to receive the elastic connection from the first mentioned hook.

3. A roller skate comprising a pair'of 'rollers near each end of the skate, a roller support: including an axle, for a pair of the rollers, and a ioot supportingelement having parts'extendc ing above and below the axle, elastic cord means rotatably yieldable horizontallyfor attaching the axle to the lower part of the foot-supporting element frombelow the axle elastica'lly'so as to exerta pull by extension'irom the axle and an other elastic cord extending from the axle up wardly to the upper part of the root-supporting element, permitting horizontal rotary shiiting ct said axle:

4. A- roller skate comprising a pair of rollers near each end of the skate, a roller support including anaxle for a pair of therollers, a foet supporting element havingparts extendingabove and below said axle, including aconnecting member above the axle,-an elastic cord 'fastenedto said connecting member, rotat'ably yieldable horizontally extending upwardly at an angle to thefoot-s'upporting element above the axle, and: another elastic suspension cord extending upwardly to the axle from the lower part of the foot-supporting element, permitting horizontal rotary shifting of said axle.

5. A roller-skate comprising a pair of rollers near each end of the skate, a rollersupport' including an axle for a pair of the rollers, a foot supporting element having parts extending above and below said axle, including a depending eye member: above the axle, anelastic cord fastened to said depending eye member, rotatably yieldable horizontally extending upwardly'at an angle to the foot-supporting element above the axle, and anotherelastic suspension cordextending upwardly to the axle from the lower part of the foot-supporting element, permitting horizontal rotary shifting of said axle;

6. A roller skate comprising a pair of rollers near each end of the skate, a roller support including an" axle for a pair of the rollers; a. foot-supporting element having parts extending above and below said axles, including a de-' pending eye member above the axle, an elasticcord fastened to said depending: eye member rotatably yieldable horizontally extending up wardly at an angle to the foot-supporting element above the axle, and another elastic sus-"' pension cord extending upwardly to the axle from the lower part of thefoot-suppo'rting' ele ment, permittinghorizontal rotary shiftingof' said axle, the axle having a housing with another eye member to which the first mentioned elastic cord is attached.

7. A roller skate comprising a pair of rollers near each end of the skate, a roller support including an axle for each pair of rollers, a footsupporting element having parts extending above and below said axles, including depending eye members above said axles, elastic cords fastened to said .depending eye members, rotatably yieldable horizontally extending upwardly at an angle to the foot-supporting element above the axles, and additional elastic suspension cords extending upwardly to the axles from the lower parts of the foot-supporting element, permitting horizontal rotar shifting of said axles, said foot-supporting element having a depending standard extending downwardly between the pairs of rollers to which the second mentioned elastic cords are attached.

8. A roller skate comprising a pair of rollers near each end of the skate, a roller support including an axle for each pair of rollers, a footsupporting element having parts extending above and below said axles, including depending eye members above said axles, including depending eye members above said axles, elastic cords fastened to said depending eye members, rotatably yieldable horizontally extending upwardl at an angle to the foot-supporting element above the axles, and additional elastic suspension cords extending upwardly to the axles from the lower parts of the foot-supporting elements, permitting horizontal rotary shifting of said axles, said footsupporting element having two yieldably connected depending standards extending downwardly between the pairs of rollers to which the second mentioned elastic cords are attached respectively.

9. A roller skate comprising a pair of rollers near each end of the skate, a roller support ineluding an axle for each pair of rollers, a footsupporting element having parts extending above and below said axles, including depending eye members above said axles, elastic cords fastened to said depending eye members, rotatably yieldable horizontally extending upwardl at an angle to the foot-supporting element above the axles, and additional elastic suspension cords extending upwardly to the axles from the lower parts of the foot-supporting element, permitting horizontal rotary shifting of said axles, said foot-supporting element having two rigidly connected depending standards extending below the axles downwardly between the pairs of rollers to which the second mentioned elastic cords are attached respectively.

10. A roller skate comprising a pair of rollers near each end of the skate, a roller support including an axle for a pair of the rollers, a footsupporting element having parts extending above and below said axle, including a .depending eye member above the axle, an elastic cord fastened to said depending eye member, rotatably yieldable horizontally extending upwardly at an angle to the foot-supporting element above the axle, and another elastic suspension cord extending upwardly to the axle from the lower part of the foot-supporting element, permitting horizontal rotary shifting of said axle, and the axle having an axle housing with an upwardly directed eye offset laterally from the first mentioned eye for connection thereto with the first mentioned elastic cord.

11. A roller skate comprising a pair of rollers near each end of the skate, a roller support including an axle for a pair of the rollers, a footsupporting element having parts extending above and below said axle, including 2. depending eye member above the axle, an elastic cord fastened to said depending eye member, rotatably yieldable horizontally extending upwardly at an angle to the foot-supporting element above the axle, and another elastic suspension cord extending upwardly to the axle from the lower part of the foot-supporting element, permitting horizontal rotary shifting of said axle, the depending eye member being mounted on a slotted shoe plate.

12. A roller skate comprising a pair of rollers near each end of the skate, a roller support including an axle for a pair of the rollers, a footsupporting element having parts extending above and below said axle, including a depending hook member above the axle, an elastic cord fastened to said hook member, rotatably yieldable horizontally extending upwardly at an angle to the footsupporting element from the axle and another elastic suspension cord extending upwardly to the axle from the lower part of the foot-supporting element, permitting horizontal rotary shifting of said axle.

ALAN E. MURRAY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 189,451 Gibson -1 Apr. 10, 1877 257,941 Herder May 16, 1882 1,002,729 Mills et al Sept. 5, 1911 1,302,508 Caproni May 6, 1919 1,342,138 Stupar June 1, 1920 2,016,847 Wylie Oct. 8-, 1935 2,086,557 Kaptuller July 13, 1937 2,330,338 Dekome et al Sept. 28, 1943 FOREIGN PATENTS Number Country Date 23,095 Great Britain Aug. 8, 1912

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