US1334096A - Washing-machine - Google Patents

Description

E. B. HOFF. WASHING MACHINE. APPLICATION FILED MAY 25. 1917.

1,334,096. Patented Mar. 16, 1920.

3 SHEETS-SHEET I.

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39 1 /4 a Z5 r W I 5 I x l v I r r 7 I. Z 1/ 5 6 P 15. :F if 16 4 n-if F 5 I 1019 5L 1 20 17 i WM MW E. B. HOFF. WASHING MACHINE. APPLICATION FILED MAY 25, I917- Patented Mar. 16,

3 SHEETSSHE-ET 2- E. B. HOFF. WASHING MACHINE. APPLICATION FILED MAY25, 1917.

Patented Mar. 16, 1920.

3 SHEETSSHEET 3.

UNITED STATES PATENT OFFICE.

EARL B. HOFF, OF EAST CLEVELAND, OHIO,

ASSIGNQR TO ELECTRIC VACUUM CLEANER COMPANY, INC., OF EAST CLEVELAND, OHIO, A CORPORATION OF NEW YORK.

WASHING-MACHINE.

Specification of Letters Patent.

Patented Mar. 16, 1920.

Application filed May 25, 1917. Serial No. 170,832.

To all whom it may concern Be it known that I, EARL B. Horn, a citizen of the United States, residing at East Cleveland, in the county of Cuyahoga. and State of Ohio, have invented a certain new and useful Improvement in lVashing-Machines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

This invention relates to washing machines and has for its object the provision of a device of this character of great cheapness, simplicity, and reliability, that will wash efficiently and rapidly the clothing or fabrics intrusted thereto with a minimum 0 wearing and tearing, and with a minimum of danger that oil, rust or metal dust will come in contact therewith. In the drawings accompanying and forming a part of this application, I have illustrated certain simple constructions which embody my inventive idea, although it will be understood that these illustrations constitute only a small number of the mechanical forms by which my inventive idea may be realized, wherefore 1 limit myself only by the terms of the claims hereto annexed and not to the particular features of construction illustrated.

In these drawings Figure 1 represents a vertical central sectional view through a washing machine constructed in accordance with my invention; Fig. 2 is a top plan View of the device shown in Fig. 1; Fig. 3 is a transverse sectional view taken on the line of Fig. 1 and looking downwardly; Fig. 4 is a perspective view of the oscillating mechanism or escapement; Fig. 5 is a vertical central sectional view illustrating a modification of my invention; Fig 6 is a vertical central sectional view of another modified form of washing machine embodying my invention; Fig. 7 is a perspective view of a portion of the oscillating mechanism employed in Fig. 6; Fig. 8 is a detail sectional view of yet another form of oscillating mechanism, Fig. 9 is a-horizontal sectional view on line 9-9 of Fig. 8 looking downwardly and Fig. 10 is a fragmental plan view of a part of the driving mechanism illustrated in Fig. 6.

Describing theparts by reference characters, 1 represents the tub or casing of my improved washer which is preferably of cylindrical shape and secured to a frame work 2 of the usual or any suitable type and supported by legs 3 of any desired number. The bottom of the tub or casing is hi her inthe center than at the periphery, t ere being a more or less gradual slope from the center outwardly. The purpose of this is to give to the material being acted upon by the 'bells or pounders a tendency to move outwardly from the center and in this manner reduce the tendency of said material to wrap around the central pillar. Rising axially inside this casing or tub isthe pillar at in which is journaled the rotatable shaft In the present embodiment this pillar is threaded into a vertical boss 6 carried by the frame 2, the tub is next applied to said pillar, and the whole secured together by a single nut 7 threaded upon the exterior of the pillar, said arrangement also forming a watertight seal.

In order to afford to the shaft 5 a slow uniform rotation, with the employment of a high-speed electric motor, I have illustrated a peculiar type of gearing best shown in Figs. 1 and 3. Rigidly secured to the lower end of the shaft 5 is a spur gear 10 which meshes with a pinion 11 journaled on a fixed stud 12 carried by the frame 2. Rigid with the pinion 11 is a spur gear 13 which meshes with a pinion '14 secured to the hub 15 of a friction wheel 16. The hub 15 is sleeved upon the shaft 5 beneath the gear 10 and is rotatably secured in place thereon by a collar 17. This hub is also peculiarly arranged Within a recess 18 formed at the center of said friction wheel as shown in Fig. 1, the bottom of said recess being sloping as shown at 19 as far as the passage 20 which leads to the oil well 21, and the top of said recess having a flange 2-2 which overhangs the gear 13. The wheel 16 is operated by a friction wheel 23 driven by the motor 24. As a result of the peculiar construction of the: wheel 16 and its associated gearing, any oil falling upon the portion 19 will be carried outwardly" by centrifugal force and will eventually find its way to the gear 13 by way of the flange 22 whence it will be distributed. to the gears 10 and 14, so that all parts will be continuously lubricated without any danger of dripping oil.

Referring first to Fig. 1, it will be seen that the upper end of the shaft 5 has a crank 26 which is inclined at an oblique angle to the axis of the shaft and has at its respectively,

. or other shock absorbing lower end a stop or collar 27. Rotatably sleeved upon the crank is amember 28 having a pair of oppositely projecting fingers 29, 30, respectively, and rigidly secured to the upper end of the pillar 4 is a crown member 31 havinga plurality of upwardly extending teeth or prongs 32 arranged to receive said fingers between them successively as illustrated in Fig. 4. In the present embodiment the crown is made with an odd number of teeth and the fingers 29 and 30 are exactly opposite each other and 180 apart, but an even number of teeth could equally well be used by suitably changing the position or spacing of the fingers. Upon the rotation of the shaft 5, a gyratory movement will be imparted to the member 28, which will serve to depress first one finger and then'the other into the spaces between adjacent teeth, the elevated finger being meanwhile swung laterally over the top of the opposite tooth. The crank 26 moves in the path of an inverted cone, its outer end moving in a circular orbit as illustrated in the dotted ellipse a, while the arms 29 and 30 describe the looped paths indicated at b and 0. It will be observed by carefully considering Fig. 4 that the result of the present arrangement is to afford to the member 28 a slow rotation in a direction opposite to the rotation of the shaft. The speed of oscillation of the member is identical with the speed of rotation of the shaft, and the speed of rotation of the member is determined solely by the number of teeth in the crown.

The portion of said members above the fingers is squared as shown at 35 for the reception of the socket-36 from which extend the arms 37, 38, said socket and arms form ing a bell or pounder supporting yoke. The bells 25,25 are provided with shanks 39, 40

terminating in balls 41, 42, respectively, received in sockets 43, 44, respectively, carried at the end of elastic strips devices 45, 46, respectively, which are secured to the arms 37 and 38. The elastic strips 46 are inturned at their outer ends for the purpose of increasing their eifective action without increasing their over-all length. Inturning the ends of the strips also decreases the danger of injuring the material being washed. These elastic strips prevent breakage of the apparatus in case a wad of clothing of undue thickness should be encountered, while the universal movement of the balls 41, 42 allows for the gyratory movement of the yoke. The upper end of the member 28 is provided with a threaded portion 47 for the reception of a cap 48 by means of which the yoke 36 is secured in place yet permitting its ready removal when it is desired to introduce or remove clothing from the casing. A cover 49 is preferably provided and one of the advantages of the invention is that the mechanism for transferring the rotatory movement of the shaft 5 to the vertical and progressive movement of the bells is wholly lwithin the casing and underneath this cover whereby splashing of Water over the sides of the casing is prevented.

' It will be seen that one of the important practical features of my improved washing machine is the provision of a simple and compact mechanism, wholly within the tub, whereby the rotation of the shaft 5 is transformed into a combined reciprocatory and advancing movement of the bells or pounders; and it will further be seen that another important feature of this mechanism is a yoke mounted upon an inclined crank driven by the shaft 5 combined with means for imparting to said yoke a different rate of rotation than that of the shaft. So long as the rate of rotation of the yoke is different from that of the shaft a nutatory movement will be produced, and the crown or escapement mechanism illustrated in Fig. 1 is the simplest means that I have conceived for "securing this difference in rotation. It is immaterial whether the direction of rotation of the yoke be the same as or opposite to that of the main shaft. In the arrangement shown in Fig. 1 the direction-is opposite, but in Fig. 5 I have illustrated a crown or escapement mechanism in which the direction of rotation is the same as that of the main shaft. In this embodiment the main shaft 5 is provided at its upper end with an inc-lined crank 50 removably attached thereto as by the key and socket 51. A yoke 52 is journaled on the crank 50 as before, but its fingers 53, 54 are disposed adjacent to its upper rather than its lower end, and coiiperate with a crown 55 rigidly secured to the cover 56 instead of to. the pillar 4. The remaining features of the device are similar to the arrangement illustrated in Fig. l, and the mode of operation is the same excepting that the yoke 50 has a slow movement of progression in the same direction as the rotation of the shaft 5. To remove the bells the whole upper part of the shaft is removed at the point 51.

In Figs. 6 to 9 inclusive the rotation of the yoke is regulated by means of gearing. Referring first to Figs. 6' and 7 it Will be seen that a hollow sleeve 60 is interposed between. the shaft 5 and pillar 4 and by means of suitable gearing is arranged for rotation at a slower rate than the shaft 5. The upper end of this sleeve carries a star wheel 61, and the crank 62 of the shaft is provided with a yoke 63 having fingers 64 adapted to cooperate with the teeth of the star wheel. It will be obvious that the sleeve 60 may revolve either sloWer or faster than the shaft 5, and in the same or a differthe shaft 5, the sleeve ent direction. In the embodiment shown the sleeve and shaft rotate in opposite directions.

In the arrangement shown in Fig. 6, the shaft 5 and pounders are reversed in direction of rotation after a given number of revolutions. This periodic reversal is preferable in many cases to the continuous rotation in a single direction, and is accomplished by a system of gearing as follows: The shaft 5 carries journaled on its lower end a special gear member 80, the periphery of this gear being provided with spur teeth for mesh with the drive pinion 81 of a system of reduction gears (not shown). The member is formed on its upper side with two annular flanges 8:2 and 83 spaced far enough apart to receive therebetween a pinion 84 fixed to the vertically disposed stub shaft 85. The flanges 82 and 83 form segmental gears, the fiange 82 being provided with external spur teeth while the member 83 is provided with internal teeth. The segments on the two members alternate with each other and in the specific embodiment shown each segment extends 180 or half way around the gears. The pinion 84: meshes alternately with these segments and the direction of rotation of the stub shaft 85 is consequently reversed after a predetermined number of revolutions. The movement of the stub shaft 85 is transmitted to shaft 5 through a gear 86 fixed to the stub shaft and meshing with an idler gear 87, the idler in turn meshing with a pinion 88 fixed to the shaft 5. The direction of movement of the sleeve 60 is also reversed with being connected to the stub shaft 85 through intermeshing gears 89. The stub shaft 85 is journaled at its upper end in the frame work 2 and intermediate its ends in the bracket 2 projecting downwardly from the frame work and bent to extend horizontally toward the shaft The idler 87 is also journaled in the bracket 2. It is understood that the reversing and driving mechanism here shown is for illustrative purposes only and that my invention contemplates the use of any of the vari- 011s forms of mechanisms for accomplishing the same purpose. It is also noted that the gear ratio whereby the shaft .5 is caused to rotate a predetermined number of revolutions in one direction before reversalis gen erally a matter of choice, so long as a ratio is chosen such that the yoke and pounders make at least one-half rotation before reversal takes place. It is preferable however, that the pounders make more than one half rotation around the tub before reversal takes place in order that the paths of the two pounders may overlap each other. and accordingly in the embodiment illustrated the shaft 5 is caused to make twenty or more revolutions in each direction before reversal takes place, as this will cause the paths of the pounders to overlap each other considerably. It is also understood that the reversal feature is equally applicable to the modifications shown in Figs. 1 to 5 inclusive wherein the sleeve carrying the star wheel is stationary.

Referring next to Figs. 8 and 9, the upper end of the pillar l is shown as formed with a concentric enlargement 70 formed with internal teeth 71, while the shaft 5 carries an eccentric 72 upon which is journaled a spur gear 73 having a different number of teeth than the enlargement or internal gear 70. The upper face of the gear 73 carries a plurality of pins 7 47 t arranged to engage with the teeth 7 5 carried by the yoke member 76 which is journaled upon the inclined crank 7 7 of the shaft 5. This arrangement provides a difierential gear and it will be seen that, assuming the internal gear to have thirty teeth and the external or spur gear twenty-seven teeth, upon each complete rotation of the shaft 5 with reference to the internal gear 70, the gear 7 3 will have passed over thirty teeth, which is three more than exist in its own circumference, wherefore it will have become advanced slightly with reference to the shaft 5, carrying with it the yoke member 76, obviously the difference in the number of these teeth can be made as great or small as desired, and the direction of rotation will be made positive or negative depending upon whether the gear 70 or 73 has the larger number of teeth. I have shown the gearing as provided with a cover 7 8 to prevent the escape of oil or the accidental soiling of clothing.

Owing to the improved arrangement of the crank 26 the yoke and bells are given a wabbling action. As the crank revolves with the shaft 5 within the member 28, it also moves in the path of an inverted cone. As a result of these two movements the bells as they descend and rise are given an orbital movement, the main axis of which is generally vertical. As the bells are moved in this manner they are also moved toward and away from the axis of the shaft; this also being due to the inclined arrangement of the crank. The result of these conjoint movements is to cause the bells to work over a rather extended area or region and hence their effective action on the material being washed is greater than would be the case if they merely moved up and down in a straight line. The action of the machine is further improved by the fact that there is a relative procession or movement of the material being washed and the bells or pounders.

It will be obvious that the claims hereto annexed are generic to the above described mechanisms, and that many other forms and arrangements could be employed within the scope of said claims, all of which forms and arrangements I assert and desire to secure by these Letters Patent.

Having thus described my invention, what I claim is 1. In a washing machine, the combination of a casing, a shaft rising vertically through the bottom of the casing and having a crank at' its upper end which is inclined at an oblique angle to the axis of said located within the casing which yoke is carried by the crank and in which the latter is free to rotate, said crank oscillatingthe yoke, pounders carried by the yoke, and

means for rotating the shaft.

2. In a washing machine, the combination of a casing, a shaft rising vertically through the bottom of the casing and having a crank at its upper end which is inclined at an oblique angle to the axis of the shaft, a yoke located within the casin which yoke is carried by the crank and in which the latter is free to rotate, pounders carried by the yoke, said crank oscillating the yoke and pounders, a rotary driving member, and means located at the lower end of the shaft for transmitting rotary motion of the member to the sha 3. In a washing machine, the combination of a casing, a shaft rising vertically from the bottom of the casing and having a crank at its upperend which is inclined at an oblique angle to the axis of said shaft, a yoke located within the casing which is carried by the crank and in which the latter is free to rotate, pounders carried by the yoke, said crank oscillating the yoke and pounders, means located at the lower end of the shaft for imparting rotary motion thereto, and means which prevents the yoke and pounders from rotating with the crank but permits them to freely oscillate.

4. In a washing machine, the combination of a casin a shaft rising vertically from the bottom 0 the casing and having a crank at its upper end which is inclined at an oblique angle to the axis of said shaft, a yoke located within the casin which is carried by the crank and in which the latter is free to rotate, pounders carried by the yoke, said crank venting the yoke oscillating the yoke power agency having a rotary member, speed reducing means located at the lower ends of the shaft for transmitting rotary motion of the member to said shaft, and means preand pounders from rotating with-the crank but permitting them to freely oscillate.

5. In a washing machine, the combination of a casing, arotary shaft supported in a vertical position by the bottom of the easing, a crank at the upper end of the shaft which is inclined at an oblique angle to the axis of the shaft, a member mounted on the crank and in which the latter is free to turn,

'within the pillar, shaft, a yoke I and pounders, a motive 1 pounders which are carried by the member and are oscillated by the crank, means for preventing the member and pounders from rotating with theprank, and means located below the casing for rotating the shaft.

6. In a washing machine, the combination of a casing, a vertical pillar supported by the bottom of the casing, a shaft located a crank on the upper end of the shaft which is inclined at an oblique angle to the axis of the shaft, means located between the crank and the upper end of the pillar to prevent water from entering the pillar, a member mounted on the crank and in which the latter is free to rotate, pounders carried by said member, means carried by the pillar and member which coo erate to prevent the member and pounders from rotating with the crank, and means located. below the bottom of the casing for rotating the shaft.

7. In a washing machine, the combination of a casing, a shaft rising vertically through the bottom of the casing and having a crank at its upper end which is inclined at an oblique angle to the axis of said shaft, a pillar supported by the bottom of the casing which supports the shaft in an upright position, a yoke carried by the crank and in which the latter is free to rotate, said crank oscillating the yoke in a vertical plane, pounders, yielding means for connecting the yoke and pounders, a motor located below the'oasing and having a rotary member, and means 10- at the lower transmitting rotary motion of the member to said shaft. 8. In a washing machine, the combination of a casing, a rotary shaft rising vertically from the bottom of the casing and having a crank at its upper end which is inclined at an oblique angle'to the axis of said shaft, a yoke carried by the crank and in which the latter is free to rotate, said crank oscillating the yoke in a vertical plane, pounders, means carried by the yoke for supporting each of the pounders which includes a spring and a universal joint,-.an electric motor situated below the casing, and speed reducing means situated at the lower end of the shaft end of the shaft for for transmitting rotary motion from the motor to said shaft.

9. In a washing machine, the combination of a casing, a vertical pillar extending upwardly from the base of the casing, and sup-.

framework beneath the casing,

disposed rotary shaft journaled in the casing shaft in its upright position,

yoke, means acting on 10. In a washing machine, the combination of a casing, a vertical pillar extending means being given a wabbler action by the crank, a guide carried by the upper end of the pillar, a finger which moves with-the member and engages with the guide to prerent it and the pounders from rotating with the shaft, an electric motor located below the bottom of the casing, andmeans interposed between the motor and the lower end of the shaft for transmitting rotary movement from the former, to the latter. I

11. In a washing machine, the combination of an upright casing, a vertical shaft projecting upwardly through the bottom of said casing and having at'its upper end an inclined crank, means arranged to hold the a yoke jourpounders secured to the the lower end of the reventing the crank.

the combinaa supporting. a vertically naled on said crank,

shaft to rotate it, and means yoke from rotating with sai '12. In a washing machine,

tion of an upright casing,

and extending through the bottom thereof, pounders, means located wholly within the casing for causing the shaft to impart wabbling movements to the pounders, and gear- 65 in its vertical position,

inglocated wholly beneath the casing for rotating the shaft. I

13. In a washing machine, the combinaa support therefrom the bottom of the casing, a crank driven by the shaft andwhich is inclined to the axis thereof, a member carried by the crank in which the latter is free to rotate, a yoke which has a socket that is adapted to fit over said member,'means ber and socket to prevent relative rotation thereof, elastically supported pounders' carried by the yokean angularly displaced, gearing for rotating neath the casing, a motor for driving the gearing, and means for preventing the yoke from rotating with the crank while permitting it and the Rounders to be freely oscillated,

14:. In a washing machine, tion of a casing, a shaft which extends vertically 'up through the bottom of the casing and has a cran at its upper end which is inclined at an oblique angle to the axis of said shaft, bearings for holding the shaft p'ounders between the mem-' the shaft located underthe combinaa yoke journaled on I the crank which is provided with arms, pounder's attached to the arms, means cooperating with the lower end of the shaft for rotating it, fingers moving with the yoke and projecting in opposite directions, and a toothed crown member supported in, substantial alinement with the axis of the shaft, theteeth of said crown adapted to receive between them alternately the said fingers;

15. In a washing machine, the combination of a casin a rotatable shaft which projects vertical y upward through the-bottom of the casing and is provided with acrank at its upper end which is inclined at an oblique an le to yok'e journale' on the crank, pounders. carried by the yoke, and means for slowly rotating the yoke while it is being oscillated by the crank.

16. In a washing machine, tion of a casing, an upright to the bottom of the casin and having teeth at its upper end, a rotata 1e shaft journaledin the pillar, said shaft projecting upwardly through the the combinaper end which is inclined to the axis of said shaft, pou'nders, a yoke journaledon said crank which has arms arranged to carry the pounders, and pro ec-' pillar secured bottom of the casing and having a crank at itsup the axis of the shaft, a"

tions moving'with the yoke and coiiperating with the teeth, tions being unequal 100. disposed shaft casing and has a crank'at its'upper end, said a crank being inclined to the axis of ear shaft, a yoke journaled on the crank, elastic means secured to the yoke, and-socket means for connecting the elastic pounders, ballmeans and pounders, and means for preventing the free rotation of the yoke andpounder's with the crank. 18. In a washing machine, the combine tion of a casing, a vertically disposed pillar rising from the bottom thereof. a sha which extends upwardly through the pillar from a point below the bottom and is'nrovided with a crank at its upper endwhich is inclined'to the axisof said shaft, a yoke and pounders. the former being iour'naled on the crank and oscillated therebv; a driven I wheel'se'curejd on the lower end of the shaft, gearing located adjacent the 'hub of the wheel' and driven-by it for rotating-the shaft,

and a motor for rotating the wheel.

19.'In a washing machine, the combination'of a casing, a vertically disposed pillar rising from the .bottomfl' thereof, a a crown mounted on the uppe'rcnd of the pillar. a vertical shaft located within the pillar which is provided with a crank at its upper end which is inclined to the axis of said shaft, a member mounted on the crank which is partially surrounded. by-the crown, a projection on the member which cooperates with the crown to prevent the member from rotating with the crank, a yoke which fits over the memberand is oscillated by the crank, pounders carried by the-yoke, and

means located below the casing'for rotating the shaft.

20. In a washing machine, the combination of a casing, a pillar that extends vertically through the bottom of the casing,

means for securing the pillar to said bottom low said bottom,-

' I vwheel and shaft, other gears and forming a water-tight seal, a frame member supportingthe pillar at a point bea shaft. which extends andis held in position through the pillar crank on'the upper end thereby, an inclinedof'the shaft, a driven wheel loosely mounted on the lower end of the shaft, gears on the meshing with the first and supported by said member, a

motor for driving the shaft, a yoke journaled on said crank and oscillated thereby,

" crank.

and pounders actuated by the yoke and '21.- In a washing machine, the combination of a casing which has 'a bottom that slopes downwardly from the center toward the periphery --to. assist in-moving the material being. washed outwardly. from the shaft, a .wabbler'crank driven by the upper end of the shaft, a yoke mounted on the crank and inawhich the latter is free to turn,

pounderswhich are actuated'by the wabbler crank and yoke, andmeans for rotating the 'shaft from. its lower end. v

22. In a' .washing'machine, the combination of a casing. a-rotary shaft supported in a vertical position by the bottom of the casa crankat the .upperend of the shaft which is inclined at an oblique angle to the axis of theshaft, a member'mounted on the eflective length of supported by the inturned- .1 and pounders,

crank in which the latter .is free-to turn, a;

yok'e carried by the member which is provided with spring arms each of. which is inturned at its outer ends to. increase the the spring, a pounder .and means for rotating the shaft. I I

23. In a washing machine. the combination of a casing a shaft rising vertically vthrough the bottom of the casing. and havits upper end which is in- .clined at an oblique angle to the axis of the shaft, a yoke located within mg a crank at g the casing and mounted on the crank. pounders carried 'by the yoke, said a. rotary driving member,

and means actuated by the memberfor peri- 'o'dically turning the shaft first in one direc-' tion and than in the other. g

crank oscillating the yoke.

24r. In a washing machine, the combination of a. casing, a shaft rising vertically through the bottom of the casing and have lng a crank at its upper end which is inclined at an oblique angleto the axis of the shaft, a yoke located within the casing and mounted on the crank, pounders carried by the yoke, said crank oscillating the oke and pounders, a rotary driving member, and gearing located below the casin and driven by the member for periodical y reversing the direction of movement of the shaft.

25. In a washing machine,'the combination of a casing, a shaft rising vertically through the bottom of the casing and havmg a crank at its upper end which is inclined at an oblique angle to the axis of the shaft, a yoke located within the casing and mounted on. the crank, pounders carried by the yoke, said crank oscillating the yoke and pounders. a rotary driving memher, a wheel driven by the member which A has sets of gear teeth arranged in segmental form, a gear arranged to mesh with said sets in alternation, and means for transmitting motion from said gear to the shaft "for causin'" dic reversal of the shaft.

26. In a washing machine, the Combine; tion of a casing, a shaft rising vertically through the bottom of the casing and having a crank at its upper end which is in clined at an oblique angle to the axis of the shaft, a yoke located within the casing and end of each arm the shaft, a yokelocated within the casin ember for driving the oscillating the yoke and hav-- its upper end sw lch 1s m-- andmounted on the crank, pounders carrier I by the yoke, said crank. oscillating the yoke and pounders, shaft, a pair of flanges on the wheel,'and a rotary memberwhich periodically engages a wheel journaled on thethe flanges in alternation for driving the shaft in different directions.

In testimony signature.

. EARL B. HOFF. Witnesses: h

E. C. ROBERTSON, Geo. B. House;

whereof, I hereunto aflix my

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