US2298768A - Snow plow - Google Patents

Description

oct. 13, 1942. G, a KESTR A f 2,298,768

Wfl/4 uluuullllll A hull.:

Oct. 13, 1942.

G. B. KESIER- 2,298,768

vsnow Pnow Filed June fr; 1940 Y z'sheets-snee; 2

Patented Oct. 13, 1942.

marmov STATES PATENT OFFICE.v

f 'SNSW 4 Gcorgexesterg'linglenlowa Application June?. 1940, vsemi No. 339,335

, 1s claims. This invention relates to improvements in snow plows. The object of my `invention is to' provide a snow plow so' constructed and arranged that the tractor foroperating the snow plow may be mounted between a pair of forwardly and rearwardly inclined blades, wherein the power from the tractor may be applied to the forward end of the blades in such a manner as to stabilize, the blades when in action, against side draft or lateral movement, and in connection'therewith, `improved means for attaching the blades to the forward end of a tractor and for elevating and lowering the same.

A further object of my invention is to provide in a snow plow of the type above described and in which is employed blades of a considerable height or width. in the neighborhood of six feet orl more, improved means for adjusting the rear i or free ends of the blades toward and from each other and for stabilizing the blades against inward and outward movement of the top edges of the blades relative to inward and outward movements 'of the bottom edges of the blade, to overcome .the tendencyI of the lower edges. of the blade to move inwardly relative to the upper edges when a larger portion of the pressure is applied to the lower edges of the blades.

A further objectis to provide in a snow plow of l the type having a pair of forwardlyand inwardly inclined blades, with a power-applying means between the blades, improved meansv for moving the free ends of the blades toward and from each other and relative to the tractor, and wherein either lof the blades may be moved inwardly or outwardly independently of the other to assist lin the steering of the plow and to adjust vthe width of the path cleared thereby, and, further,

to provide in 4connection therewith improved.

means for elevating and lowering the rear ends of said blades by power derived from the power take-oil of the tractor.

VA further object of my invention is to provide in a snow plow, other means to assist in the steering of the snow plow, which consists in providing ahead of the forwardly and inwardly inclined blades,` a pointed head or wedge pivotally mounted to swing laterally, andin connection therewith, means actuated from thepower take-- ofi of the tractor for adjusting said head.

A further object is to provide in a snow plow of the type above described, anA improved gear mechanism which may be detachably connected to the draw bar of a tractor and operatively connected with the pow r take-off shaft for performing all of the above mentioned adjustments, 55

wherein the gearsare all enclosed in a single box or casing.

My invention consists inthe construction, ar-

rangement ,and combination of the various parts of the device, wherebythe objects contemplated plow, showing the manner in which it is attached to a tractor, preferably yof the type employing endless and flexible treads;

Figure 2 is a longitudinal and'sectional view of the same taken on the line 2-2 of Figure 1;

Figure 3 is a transverse sectional view taken on the line 3-3 of Figure 1:

Figure 4 is an enlarged sectionalview taken on the line 4--4 of Figure 3;

Figure s is an enlarged datan sectionei view i 2o taken on-the line 5-5 of Figure 3;

Figure 6 is a top view of the gearcasing with the cover plate removed, portions being broken away;

Figure 'I is a detail sectional view taken .on the Figure 8 is an enlarged detail sectional view taken on the line l-B of Figure 1;

Figure 9 is a detail sectional view taken on the line 9--9 of Figure 2;

Figure 10 is an enlarged detail sectionalview takeifon the line III- III of Figure 3; and

Figure 11 is a sectional view taken on the line II-Ilof Figure 1.

0n the drawings I have used the reference numeral I0 toindicate a tractor having an endless tread II and a power take-oil shaft I2 and a draw bar I3, which are of ordinary construction. Mounted on the forward end of the tractor I0 is a cross bar I 4 having at each end a for- 4()v wardly extending portion I5 for supporting a shaft I5, to which is pivotally supported a frame I1, having forwardly and inwardly extending.

'members I8V pivotally supporting a collar I9, in which is lslidably mounted a vertical shaft 2li 4 5 held' against downward movement by means of an adjustable collar 2I. Mounted on the shaft 20 are horizontally and transversely arranged members 22 forming part 0f the side wings 23 i and providing means for pivotally supporting the forward end -of said side wings to permit their rear ends to swing toward andfrom each other, and at the same time provide means for mounting the" forward end of the saidside wings to the forward end of the tractor, the ,saidside wings 23 extending on each side ofthe tractor and terminating in a point some distance be'- yond the rear end thereof, so that, when the tractor is mounted between the forward ends offthe wings, it provides means for applying power to the forward ends thereof, for advancing the said wings forwardly and over the ground surface. v v

The frame l1 is provided with an upwardly extended arm 24 by means of which the forward ends of the members I8 may be raised and lowered, and which in turn provides means for raising and lowering the forward ends of the blades 23. The forward end of each of the "blades 23 is provided` with a forwardly and inwardly inclined portion 25 terminating in forwardly extending portions 26 having horizontal slots 21 near their lower ends for receiving a horizontally arranged bar 26 mounted on the lower end of the shaft 29. y

Mounted above the top members 22 and on the said shaft 20 is a bar 29, the bars 28 and 29 bein'g. xed to the lower and upper ends of -the shafts 29 and adapted to support the rear end of the nose portion 3|), which comprises forwardly and inwardly inclined diverging and upwardly and inwardly inclined cutter blades 3|, terminating in a cutter edge 32. The rear ends of the blades 3| are designed to overlap the forward ends of the forwardly extending portions 26 wherein the member 30 as a unit may be pivoted about the shaft 20, with the rear, edges of the blades 3| substantially in alignment with. the front edges of the blades 23. 4 The said member 30 provides means for penetrating a snow drift and for separating the snow to deliver the same to the blades 23. By pivoting the said head. 30,

' means is provided whereby a lateral suction may be created in thedirection -in which the pointed end is swung?, to thereby assist in steering the forward end of the tractor and also the forward end of the blades 23. It is oftentimes necessary to penetrate a snow drift in which the d rift is very deep at one side of the highway and is comparatively shallow on the other lside of the highway, so that if the drift was 'penetrated with the nose portion or pointed end of the head in alignment with the central longitudinal axis -of the tractor, a side draft would be created tending to point the tractor out of the drift, while with my improved construction the forward end of the head 30 could be pivoted to enter the deeper side of the drift, Vwhich would tend to pull the forward end of the tractor and the blades into the drift rather than out of the drift. Means hereinafter described is provided for steering the said head.

It is oftentimes desirable that the rear end of one of the blades 23 be moved to a greater distance from the longitudinal center of the tractor than that of the rear end of the other blade, thus assisting and co-ordinating with the afore-mentioned action of the nose in overcoming side draft and steering the plow, or it may be desirable to move both of the free ends of the blades outwardly or inwardly to vary the width of the path cleaned bythe snow plow. To accomplish this I have pro'vided the following mechanismt Mounted on the inner surface of the rear ends of each of the blades 23, and near their top edges, I have provided a bracket 33, and near the bottom of each of the said blades I have provided a bracket 34, the inner ends of said brackets rotatably supporting a vertically arranged tube,. 35, the central portion of which is` provided with a gear casing l 36. f Extending longitudinally Y 45. Pivotally mounted on the lower end of said having a slot 41 in its rear side.

through the tube 35 isa shaft 31 having its outer surface screw-threaded. Pivotally connected to the lower end of each of theY shafts 31 is a caster wheel 39 providing means for supporting the weight of the blades 23, which weight is carried by means of a bevel gear 40 threaded on the shaft 31, said bevel gear serving as a nut, said gear having a hub 4|a on which the upper side 1 of the casing 36 is mounted, thus providing means for supporting the tubular member 35, and

rotated by means of a bevel gear 4| driven by a shaft 42 from a universal joint 43 which is operated in the manner hereinafter described.

Pivotally supported on the upperr end of one of the tubes 35 and resting on a collar 35a, adjustably fixed thereto, is a tubular bar 44 having its back side provided witha longitudinal slot tubular member 35 is a second tubular bar 46 Telescopically supported in each of the members 44 and 46 is a bar 48 having their outer ends pivotally supported on the upper and lower ends of another one of the tubular members 35, the upper member 48 being supported by a `collar 35h, as clearly illustrated in Figure 3 the collars 35a and 35h serving to support the weight of the bars 44 and 48, and they in turn the weight carriedby the brackets 33, 'The rear face of each of the bars 48 is provided with a rack 49. The upper edge of the back side of the member 44 is provided with a rack 50, while the back edge of the member 46 is provided with a rack 5|. The inner ends of the tubular members 44 and 46 are connected to a vertical frame member 52, so that the members 44 and 46 and the member 52 constitutea rigid frame having its outer end pivotally connected on the corresponding tubular member 35.

Slidably mounted to and between the members 44 and 46 is a carriage 53, said carriage comprising upright channel irons 54 having their upper ends connected to a shoe 55 adapted to travel on the under. surface of the member 44,l

the lower ends of the members 53 and 54 being connected to a shoe 56 adapted to travel on the upper surface of the member 46 so that'the carriage is free to move longitudinally between the member 52 and the tubular member 35. The back face of each of the members and 56 is provided with bearings 51 for supporting upright shafts 58 and 59, the ends of the shaft 58 being provided with pinions 60 designed to coact with the. racks 50 and 5|, while the ends of the shaft 59 are each provided with a pinion v 6| designed to coact with the racks 49, said pinions being fixed to their respective shafts.

From this arrangement it will be seen that theA tubular shafts 35 may always be supported, parallel to each other and that the said tubular members may be moved toward and from each other so that the distance between the blades 23 may be adjusted and at the same time maintain 58 and 59 ,serve to provide a telescopic frame, so

aaosycaf arranged thatthe blades 23 are'held against rocking movement abouttheir longitudinal axis.

Slidably mounted in the channel irons 53 and 541s 4a gear casing 82 having lugs 63 formed the'eon adapted-'to travel in the said channel irons (see `5). Each of the channels is provided with a vertical slot 84 for receiving a bolt 65 to prbvide means whereby the gear casing -may be vadjusted at various elevated positions.`

The shafts 58 and 59 are mountedto pass through 'said gear casing 62, the shaft 58 beingprovided with a worm gear 86 which is slidably mounted on said shaft and is designed to'mesh with a rack bars 45|) and 5| may be moved longitudi- 'nally relative to the carriage 53 by rotating the shaft 58 by means of gears 56 `and 61 and the shaft 68. In like manner the racks 49 may be moved longitudinally by rotating the shaft 59 by `means ofthe gears and 1I and the shaft 12, thus p ov-idingmeans for' adjusting the rear ends of the blades toward and from each other.,

Extending downwardly from the .bottom of the casing 62 is' a ange 14 adaptedto receive one 'endof a rod 15, said rod being connected to the frame member 16', which in turn is pivotally connected to the draw bar|3 ofthe tractor, thus providing means for supporting the carriage 53' against lateral movement relative to the tractor.

The carriage is permittedto move upwardly and downwardly duev to the pivotal connection between the members andthe draw bar I3.

shaft |02. The rear end of the shaft 94 is connected to a telescopicshaft |03, which in turn is connected to the shaft 12. Means is thus provided whereby the racks 58 and 5| maybe actuated from power derived from the shaft I2 simply by moving the gear 91 into `mesh with .the gear 92. In like manner, the shaft 98 is connected' to a telescopic shaft |04 by means of suitable universal joints, said s haft |04 being connected to the shaft 68, vthus providing means whereby the racks `49 may be driven from power derived from the shaft I2, the reverse gear mechanism 8| providing means whereby the shaft 92 may be driven in either direction, and thus providing means whereby the said racks may be either moved inwardly or outwardly.

supported above the' shaft ab is a man; m5y

which is mounted in an upwardly extending por. tion |06 in the top of the gear casing and has its forward end extending through said portion |06 and mounted in a bearing |01a. 'I'his outwardly extending portion ofthe shaft |05 is screw-threaded and provided with a nut |0641 (see Fig. 48) which is pivotally connected to a lfork |01 carried'on one end of alever |08, and

which is pivotally mounted on a-vertic'al shaft |09. 'I'he free end of the shaft |08 is provided with a link I'I0, the forward end of which is connested lto the upper endl of the arm 24 carried y the frame member I1. The inner end of the shaft |05 is provided with a gear which is adapted to be moved into and out of mesh with the gear 92 by means of a shift fork II2. By

this arrangement it will be seen that if the shaft f |05 vis frotated, the nut |0611 will be caused to For operating the various adjustments above'. described from powerderived from the powerY take-off shaft I2 I haveprovided a gear casing I2, as illustrated in'Fgure2. Supported in `the front-side of the gear Vcasing 11 is a shaft 18 operatively connected with the shaft |2 -y means' of a suitable coupler 19; and pivotallyfmounted on the inner end of the shaft 18 is oneV end of what I shall term the driven shaft 80. Splined to the forwardend of the shaft is a combination internal and external gear device 8|, the

and out of mesh with a pinion. 83 carried by the shaft 18, while the external gear 84 is adapted to be imoved into and out of mesh with a spur gear 85carried by a counter shaft 86, the forward end of the counter shaft 88 being provided with a gear 81 in mesh with. a gear 88 carried by the shaft 18. lA suitable yoke V89 is carried by. a shaft 90 and provides means for sliding the gear 8| to either of two operative positions.

. The mechanism thus described constitutes the V reverse mechanism wherein the shaft 80 may be disconnected from the shaft 18 or it may be driven in either direction by manipulation ofthe Vshaft 90 through the lever 9|.

`Fixed on the rear end of the shaft 80 is'a spur gear 92 adapted to mesh with a gear 93 rotatably 40' 11, which ,isadapted to be located on the draw bar I3 rearwardly of the rear end of the shaft move longitudinally of the shaft, and in turn to cause the lever |08 to bel rocked about the shaft |09 and the link IIO to be moved longitudinally, causing the collar I9 ofthe frame membe'r I1 to be elevated or lowered, and with it the internal gear 82 being adapted to be moved into' mounted on a counter shaft 94 and also'in mesh with a gear 95 rotatably mounted on a counter shaft.V Splined to the shaft 94 is a spur gear 91 which may be moved into and out of operative position with the gear 92 by means of a fork 98 mounted on a rock shaft 99.' The shaft 99 is also provided with a spur gear |00, which is splined thereto and' adapted to be moved into pivot connecting' the forward end of the blades 23, and the entire nose assembly 30, as before described. Inasmuch as the frame I1 is actuated from the screw-threaded shaft I 05, it will be 'seen that the forward ends of the blades 23 and nose 30 will be locked against downward movement at any position where the'l gear III disengages the gear 92. For. raising and lowering the back ends of the blades 23 I have provided on the back face of each of the gears 93 and 95 a `bevel gear |I3, each of which is designed to mesh with a bevel gear IIII. one o f 4said beveled gears'being mounted on.a shaft ||5 arranged diagonally in one corner of the casing 11, a shift fork IIS being provided-for moving the gear I|4 into and out of engagement with the corresponding gear II3.

operatively connecting the shaft I I5 with the universal joint 43 of each of the corresponding ones. of theV shafts 31, is a telescopic shaft. IIEa;

Thus means is provided for elevating and lowering the rear ends of the blades 23 by simply moving theA gears |I4 into engagement with the gears l| I3, afterA which the shaft |l5 will be' rotated, causing the shaft 42 to be rotated, `and -with it the gear 4I and in turn the gear 40, causing the casing 36 and the tubular shaft 35 to be elevated or lowered, and with them the tele- Y scopic frame member connecting therear ends of said blades, It will readily be seen that the rear end of either blade may be elevateda slight distance relative' to the other since the -entire 1 frame supporting saimedes will reckon the mem rs I8 and I9, or both,

and out of operative relation with the gear 92 which is controlled by a fork III mounted on a which controls the motion of the tractor. 'my device is used with the aforesaid type loirtracvided with a clutch element |20 designed to coact with a clutch element |2| carried by a collar |22 which is splined to the shaft 80. Thus means is provided for rotating the shaft i 09 by means of the said clutch elements and the Worm H8. The upper end of the shaft |09 is provided with a grooved pulley |23 designed to support a cable |26, which is preferably wound once around the pulley in the groove thereof, and having its free` end extending over pulleys |25, thence extending forwardly to suitable lugs |26 carried on the inner face of the members 3|, as indicated in Figure 1. By this arrangement it will be seen that rotation of the shaft |09 and the pulley |23 will cause the member 3U to be oscillated about the pivot 2li, the worm gear serving as means for locking the member 3|) in any one of its adjusted positions so that the said member 30 may be moved to position with its apex end in the central longitudinal axis of the tractor, or said end may be shifted ,to either side of said longitudinal aids to createv a suction or draft to assist in steering the forward ends of the blades 23 and also the tractor I0.

Thus, itwill be seen that I have provided a snow plow comprising a pointed nose portion which is pivotally mounted to the forward end of a tractor to swing abouta vertical axis and in which is Vprovided blades supported on each side of the tractor to increase the width of the cut made by the member 30, each of these blades being adjustable laterally and relative tothe tractor, one independently of the other, so that thematerial may be moved principally to one side of the tractor if so desired, or the material may be moved in opposite directions as the tractor is advanced, the forward ends of the side blades terminating in forwardly and inwardly inclined portions to provide a recess for the rear end of the nose, to prevent snow from entering between the forward ends of the side blades and Y the tractor.

One advantage of my device lies in the fact that the entire mechanism may be easily and quickly connected to or detached from the tractor by'simply removing or attaching the frame member Il, applying the casing 1| and the frame member 16, then making the necessary connec. tions between these members with the blades.

When the device is thus applied, all the adjustments of the snow plow may be performed by other, and at the same time maintain the blades f rigidly in their proper vertical cutting-.angle or against rotation about their longitudinal axes.

In some types of tractors the power take-oil shaft is controlled by the same friction clutch When tor it is desirable to include a friction clutch of the conventional type in place of the coupler 19,

to permit the shaft 18 to be .controlled independently of the tractor-operating mechanism.

I claim as my invention: f

y1. In a snow plow, a nose portion, a pair of side wings, means for pivoting the forward ends foi? said wings to the forward end of a tractor to swing about a vertical axis with the tractor between said wings, means for swinging the foru ward end of the nose portion laterally relative to the longitudinal axis of said tractor and to said wings, means for adjusting the rear end of said side wings toward and from each other and to` said tractor. I

2. A snow plow attachment for tractors, comprising a nose portion, a pair of side wings, means for pivoting the forward end of said wings to the. forward end of a tractor to swing about a vertical axis with the tractor between said wings, means for swinging the forward end of the nose portion laterally relative to the longitudinal axis,

`forward end of a tractor to swingrabout a ver-r tical axis with the tractor between said wings,

means carried by the tractor for mounting said pivot means to be elevated and lowered, means actuated by the power take-01T of a tractor for swinging the forward end of said nose to various laterally adjusted positions, means actuated by said power take-olf for adjusting` the rear ends of said wings to move toward and from each other, and means actuated by said power take-off for raising and lowering said nose portion and theY forward ends 4of said wings.

4. In a snow plow attachment for tractors, the combination of a tractor, a bracket carried by VSaid tractor, .a blade supported on each side of said tractor, means pivoting the forward ends of said blades to lsaid bracket to permit the rear ends of said blades to be adjusted toward and from each other, means for adjusting the rear ends of said blades to 'move toward and. from each other, said means comprising a telescopic shaft connected between the upper edges of the back-ends of said blades, a telescopic shaft connected between the lower edges of the back ends of said blades, a vertical brace bar connecting the inner ends of one set of corresponding ends of said telescopic shafts, and means for adjusting said telescopic shafts longitudi-l nally, and means for connecting said telescopic shafts to the 'rear end of the tractor.

5. A snow plow attachment for tractors, comprising in combination, a tractor, a bracket carried by the forward end of said tractor, a blade supported on each side of said tractor, means pivoting the forward ends 0f said blades to said bracket to permit the rear ends of said blades to be adjusted towards and from each other, means for adjusting the rear ends of said blades to move toward and from each other, comprising a telescopic shaft carried between the upper edges of the back ends of said blades', a second telescopicr shaft connected between the lower edges of the back ends of said blades, a vertical brace bar connecting the inner end of one set of corresponding ends of said telescopic shaft, a rack bar Ycarried by each telescopic member of said shaft, a carriage movablylsupported to i Aswing about a vertical, axis.

ing a brace bar, vertical guides carried by said carriage, a gear casing carried by said guides,

a pair of vertical shafts rotatably mounted to said carriage and through said gear easing, a pinion gear flxedrto each end of each shaft, the pinions of one shaft being' in mesh with one set-of said rack bars, and the pinions of the other shaft in mesh with` the other set of rack bars. a worm gear slidably mounted on each shaft and within said gear casing, a worm in mesh with each of said gears, a shaft supporting each of said worms, and means actuated by the power take-off of said tractor for rotat- 'ing each of said worm shafts independently of eachy other in either direction. whereby correland between the said set'of telescopic bars, havon each side of said tractor, means pivoting the forward end of said blades to said bracket spending sets of racks and their respective blades may be moved relative to said tractor, and means for fixing the carriage against lateral movement relative to said tractor.

6.l Inla snow plow, a nose portion, a'pair of side wings, means for pivoting the forward ends of said wings to the forward end of atractor' ering the ends of said Jsidewings independently. t

10. In -afsnow plow` attachment for tractors,- the combination of a tractor, a bracket carried lby the forward lend of the tractor, a bracket lpivotally mounted to the iirstbracket to swing to swing about a vertical axis with the tractor between said-wings, means for swinging the for-v ward end of the nose portion laterally relative to the longitudinal axis of said tractor and to said wings, means for adjusting the rear end of said side wings towardland from-eaclg' other and to said tractor, and means actuated from the1 power take-off of said tractor for elevating A and lowering the rear' ends ofJ said side windgs. Y

7. A snow plow4 attachment for tractors, comprising a nose portion, a pair of sidewings..

means for pivoting the forward end of said wings and nose to the` forward end of a tractor to swing about a vertical axis with the tractor between said wings; means carried by the tractor to permit theirrear ends to be adjusted toward and from each other, means for adjusting said blades, comprising a telescopic shaft carried -between th'e upper edges of the back ends of said blades, a second telescopic shaft connected between the lower edges of the back ends of said blades, means for adjusting the upper and lower telescopic shafts simultaneously, means supported by the tractor mounting said adjusting means to hom it against horizontai movement relative to said tractor, means-actuated by the power take-off shaft of said tractor for actuating said adjusting means, means actuated from the power take-oifshaft of said tractor for adjusting said nose portion, andmeans actuated fromthe power v takeoff shaft of said tractor for raising and lowabout a horizontal axis, a vertical shaft carried by the second bracket, a nose portion, means formounting said'nose portion to swing about l the vertical shaft, a pair of side wings, means for pivotallymountingthe forwardends of said side wings to said vertical shaft, and-means for 'rocking said second bracket on its horizontal axis for raising and lowering said nose portion and the forward ends of said side wings.

11. In a snow plow, the combination of a bracket adapted to be attached to a tractor, a nose portion comprising diverging blades and a frame rigidly supporting said blades in fixed relation with each other, means pivotally connecting the back end of said frame to said bracket for mounting `said pivot means to be elevated i and lowered, means actuated by the power takeoff of a tractor for swingingthe forward end of .said nose to various laterally adjusted posi-V tions. means actuated by said-A power take-olf for adjusting the rear ends of said wings to move toward and from each other, means actuated by said power take-off for raising and lowering f said nose portion and the'forward ends of; said wings,l and means actuated from the power takeoff of said tractor for raising and lowering said iside wings. I

8. A snow plow attachment for tractors, comprising in combination a tractor, a bracket carried by the forward end of said'tractor, a nose portion, means for pivoting said nose portion lto said bracket to swing aboutavertical axis,

a blade supported on each side of said tractor, means pivoting the forward end of said blades to said bracket to permit their rear ends to be adjustedtoward and from each other, means for adjusting said blades, comprising a telescopic shaft carried between the upper edgesof the back ends of said blades.Y a second telescopic shaft connected between the lower edges of the back ends of said blades, means for adjusting the upper and lower telescopic shafts simultaneously, means' mounting said adjusting means to hold it against horizontal movement relative to said tractor, andmeans actuated by `the power take-of! shaft of said tractor for actuating said adjusting means.

9. A snow plow attachment for tractors, comprising in combination a tractor. a bracketcarried by said tractor, anose portion, means'for pivoting said noseportion to said bracket to a blade supported ing said nose portion. t u 12. In a snow plow, the combination of a supto swing about a vertical axis', meansactuated by power derived from said tractor for swinging the forward end of said no'se transversely of its line of travel, and means actuated by power derived from said tractor for elevating and lowerporting-frame, a pair of spaced'apart side wings operatively connected thereto, a nose portion,

' it is advanced.

13. In a snow plow, a nose portion, a pair of y side wings, means for pivoting the forward ends o f said wings to the forward end of -a tractor to swing about a vertical axis with the tractor between said wings, and means for swinging the forward end of the nose portion laterally relative to the longitudinal axis of said tractor and to said wings. i,

14.' A snow plow attachment for tractors, comprisinga bracket adapted to becarried by a tractor, a nose portion comprising forwardly converging blades, means mounting the nose portion on said bracket to permit its forward end t'o swing laterally, and a side wing extending rearwardly fromthe rear en'd of one of said converging blades.

comprising a telescopic shaft carried between.

the upper edges of the back ends of said blades, a second telescopic shaft connected between the lower edges of the back ends of'said blades, and means for adjustingA th'e upper and lower telescopic shafts simultaneously.

16. A snow plow, comprising a support, a pair of spaced and longitudinally mounted blades, means pivoting the forward ends of said blades to said support to permit their rear ends to be adjusted toward and from each other, means for adjusting the rear ends of said blades comprising a telescopic shaft carried between the upper edges of the back ends of said blades. a second telescopic shaft connected between the lower edges of the back ends of said blades, and means for adjusting the upper and lower shafts simultaneously and at the same speeds. 1

17. In a snow plow, the combination of a portable support, a nose portion comprising diverging blades and a frame supporting said blades, means pivoting said frame to swing about .a vertical axis to permit its forward end to swing' laterally,

a wing having its forward ends pivotally sup; ported near the rear end of one of said blades to receive snow-from the corresponding irst said blade as the plow is advanced, and means for adjusting the angularity of the nose relative to said support and said wing, for the purpose stated.

18. In a snow plow attachment for tractors,

. ends of said'blades to move toward and from each other, said means comprising a telescopic shaft connected between the upper edges of the back ends of said blades, a telescopic shaft conand at the same rate of speed.

GEORGE B. KEsmR.

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