Oct, 2, 1934. _ L_ DUFQUR ' - 1,975,417 ' ioToR PRoP-ELLED cupTIvAToR 0R GARDEN TRACTOR - _ Filed Oct. _ 23, 1933 2 Sheets-Sheet 1 Oct. 2‘, 1934. |_. DUFOUR 1,975,417 ' MOTOR PROPELLEDI CULTIVATOR OR, GARDEN TRACTOR ‘Filed Oct. 25, 1933 2 Sheets-Sheet 2 vPatented Oct. 2, 1934 I ~ 1,915,417 UNITED STATES ‘PATENT ‘OFFICE. 1,915,417 Moron PaorELLEn cun'rrva'roa on GARDEN-TRACTOR‘ . Léon' Dufour, Versolx, Switzerland Application October 23, 1933, Serial No. 694,875 , ' In Switzerland Qctober 4, 1933 2 Claims. (Cl; 180-19) shown. The shaft 5_ carries a worm gear‘ 6, and The present invention relates to change speed its rear end is provided with a sleeve 7 of a claw‘ ‘gears for .motor propelled ,cultivators or garden coupling forming a power, take off for cultivating tractors.- Particularly smaller sized cultivators tools. The worm gear transmits movement from , , ' must usually have two advance speeds, a slow the motor ‘to the driving wheels and the sleeve 7 60- - 5 speed used when working at relatively great depth, transmits movement from the motorto cultivating and a faster speed used when working at small tools which may be secured to the rear of the depth and for advancing the cultivator on a road ' driving-unit,.such as rotary tilling cutters, mow when it doesnot work. The actually used small ers, or other tools. The represented driving unit» cultivators are therefore always provided with a may however be used as tractor only for ‘pulling a 65 10 . change speed gear having a sliding wheel train of plow or other implements in which case the cou-I the type well known in automobile gears. These pling sleeve .7 would not be used. The representedv mechanisms have however the drawback that member 8 may thus indicate a plow carrier as - they are relatively expensive and need much room well as the central‘ar‘m of rotary tilling tools. in lateral direction, while small cultivators must The worm 6 drives a worm wheel 9 carried by 70 15 be cheap so that they may beemployed by small a shaft 28 to which ‘are secured a small pinion planters and growers and must also be as narrow 11 and a greater pinion 10. The pinion 10 is as possible to be capable of passing between rows constantly in mesh with the gear wheel 12 keyed . ' of'plants. ‘ - to a sleeve 14; and the pinionilla is constantly in The present invention has as its object- the mesh with the gear wheel 13} keyed to a sleeve 75 ' go provision of a change speed gear for motor pro 15, ‘the two sleeves 14 and 15 being integral with _ pelled cultivators which will avoid the mentioned disks .16 and 17, respectively, situated each be inconveniences; - » - - tween the casing 29 and one of the traction wheels The invention consists in a driving unit for 21 and 22. The sleeves 14 and 15 are loosely cuitivators having two traction wheels capable of mounted on a shaft 18 extending beyond the disks 80 25 being selectively locked to one or the other of 16 and 1'7. The traction wheels 21 and 22 are two rotatable coupling members each of which keyed with their hubs 19 and 20 to the two ends . ' is operatively connected to the motor by means of the shaft 18. Each disk 16_and 1'1 isiprovided of a train of continuously meshing gear wheels, with'a series of holes 23'and 24 and the wheel ' the two trains having di?erent transmission ratio, hubs areprovided each with a corresponding 85 30, so that when locking the traction wheels to ‘one hole 25 and 26, respectively. A‘ bolt 27 is en of the coupling members a slow speed maybe gaged in the hole 26 of the hub 19 and penetrates ‘ obtained, and when looking the traction wheel through one of the holes 24 of the disk 1'1, so to the other coupling member and disengaging that as represented in Fig. 1, the traction wheel the first coupling member, a fast speed will be 21 and therefore also the wheel 22 are connected - 35 obtained. to the disk 1'1 which is rotated byv the small A further object is the provision of simple and "pinion 11 and thegear wheel 13. The cultivator easily operable coupling means, .such as a bolt moves therefore in' first’ speed, that means at capable of being introduced through registering slow speed. The bolt 2'? maybe removed by holes in the traction wheels and the coupling ‘hand from the hub 19 and inserted in the hole 95 40 members‘for effecting the change of speed of the 25 of the‘ hub 20 and in one of the holes 23 of the - traction wheels. - disk 16. The two traction wheels 21, 22 turn then In the accompanying drawings, ' ' at second or fast speed, since the disk 16 is driven Figure 1 is a plan view of a driving unit of a by the larger pinion 10 and the smaller gear cultivator according to the invention, partly wheel 12. It would also be possible, to connect 100 ' 45 drawn ‘in horizontal section through the axis of the two disks 16_ and 17 by means of a pawl and ' the traction wheels. - ' _ . ratchet mechanism to the wheels 21 and'22, in Figure 2 is a side elevation of the driving unit, stead of by, the bolt 27. The advantage of using partly drawn in longitudinal section. ' a bolt resides in the fact that the driver cannot ; The represented driving unit comprises an in forget to release one of the traction wheels when 105 50 temal combustion motor 1 having a cylinder 2' the other wheel is engaged, as there is only one and a cooler 3, The vmotor shaft 30 is connected - connecting bolt at the disposition of the-driver. to one part of a friction clutch 4 of which the The described mechanism is simpler and other part is slidably mounted on the intermediate cheaper to manufacture than conventional change shaft 5. The actuating means for the friction are not ,speed gears, precisely for the reason of the ab- 110 I 55 clutch being of conventional design, l 2 1,075,417 sence oi’ any gear shift mechanism, and it re transmission ratios for operativeiy, connecting quires less space in width. Also- the manual en the drive shaft to both said sleeves. gagement of a traction wheel with a coupling 2. In a change speed gear for motor propelled disk does not form an inconvenience, because cultivators having two traction wheels, a shaft 5 small cultivators do almost never require a change connecting the two wheels and keyed to the hub‘ 80 of speed during a working period. It will be of each wheel, two rotatable sleeves loosely known before starting a certain work, which mounted on said shaft intermediate the two speed is required and the wheels will be coupled traction wheels, each sleeve having its end situ- ' accordingly. ated adjacent one traction wheel provided with a '10 coupling disk, the hub of each traction wheel 1. In a change speed gear for motor propelled andthe corresponding coupling disk being pro cultivators having two traction wheels, a shaft' vided with registering holes, a locking bolt adapt ‘ connecting the two wheels and keyed to the hub ed to be selectively introduced through register of each wheel, two sleeves loosely mounted on ing holes of one or the other wheel hub and the 15 said shaft intermediate the two traction wheels, corresponding coupling disk, a motor actuated 90 each sleeve having its end situated adjacent one drive shaft, and two trains of continuously mesh traction wheel provided with a coupling disk, ing gear wheels having different transmission ra means for selectively coupling one or'the other tios for operatively connecting the drive shaft to of said disks to the corresponding wheel hub, a both said sleeves. motor actuated drive shaft, and .two trains of con 95 tinously meshing gear vwheels having different LEON DUFQUR. 25 30 105 35 110 40 '115 45 120 50 55 ‘130 00 65 140 145 75 150 .