US3739859A

US3739859A - Snow leveler

Info

Publication number: US3739859A
Application number: US00167293A
Authority: US
Inventors: L White
Original assignee: Individual
Current assignee: Individual
Priority date: 1971-07-29
Filing date: 1971-07-29
Publication date: 1973-06-19
Anticipated expiration: 1990-06-19
Also published as: CA934546A

Abstract

A lightweight snow leveler for redefining snowmobile trails incorporating an elongated rectangular frame having front and rear traveling skis. The frame mounts a leading series of snow pulverizing discs and trailing cooperating sets of snow-shifting blades alternately rolling the pulverized snow inward, then outward and finally inward so as to provide a soft redefined trail.

Description

ilnite States Patent 1 White SNOW LEVELER [76] Inventor: Lawrence K. White, Tomahawk,

Heafford Junction, Wis. 54532 [22] Filed: July 29, 1971 [21] App1.N0.: 167,293

[52] US. Cl. 172/145, 172/178, 172/188,

172/393 [51] Int. Cl AOlb 5/00 [58] Field of Search 172/145, 170, 177178,

[56] References Cited UNITED STATES PATENTS 1,864,042 6/1932 Fisher 172/188 2,746,181 5/1956 Molene et al.... 172/784 3,331,449 7/1967 Blocker 172/181 3,043,034 7/1962 Kober 172/785 2,786,283 3/1957 Bradley 172/177 51 June 19, 1973 3,576,214 4/1971 Ratcliffe 172/787 3,666,020 5/1972 Hess 172/200 1,313,115 8/1919 Robards 172/178 2,515,317 7/1950 Schindler 172/180 FOREIGN PATENTS OR APPLICATIONS 1/1931 Sweden 172/188 Primary Examiner-Robert E. Pulfrey Assistant ExaminerR. T. Rader Attorney-Clarence A. OBrien and Harvey 13.

Jacobson 5 7] ABSTRACT 7 Claims, 6 Drawing Figures PATENIED Jul 1 9 I973 QEEIZIIFZ Lawrenbe K. White I.\ VENTOR.

snow LEVELER The present invention involves snow levelers, and

more particularly relates to a lightweight leveler'specifically adapted for grooming or redefining snowmobile trails by removing the large humps formed therein through continued use and providing a soft relatively smooth snow layer.

It is a significant object of the instant invention to provide a snow leveler or drag which, in addition to properly and efficiently redefining a snowmobile trail, is of a lightweight compact construction easily towed behind a conventional snowmobile.

Another significant object of the invention resides in the provision of a snow leveler which effectively removes the large humps or ridges developed on snowmobile trails after a period of use and reconditions the trail, by providing a layer of pulverized softened and relatively smooth snow there along.

In conjunction with the above object, it is also a significant object of the instant invention to provide a leveler which redefines the trail through a working of the top layer of the snow without any excessive gouging or plowing of the snow or underlying earth such as could hamper the speed and effectiveness of the leveling operation.

Basically, the leveler of the instant invention includes an elongated rectangular frame, ski or skid mounted for mobility, which mounts a leading bank of freely rotating pulverizing discs which encounter and pulverize the formed humps. The discs are followed by alternating inward and outward redirected pairs of blades which encounter, raise and turn the pulverized snow to complete the pulverizing operation and effect a general leveling thereof.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

FIG. 1 is a perspective view of the leveler of the instant invention mounted in operative position behind a snow-mobile;

FIG. 2 is an enlarged top plan view of the leveler;

FIG. 3 is a longitudinal cross-sectional view through the leveler taken substantially on a plane passing along line 3-3 in FIG. 2;

FIG. 4 is an enlarged transverse cross-sectional view taken substantially on a plane passing along line 4--4 in FIG. 2;

FIG. 5 is an enlarged transverse cross-sectional view taken substantially on a plane passing along line 5--5 in FIG. 2; and

FIG. 6 is a sectional detail taken substantially on a plane passing along line 66 in FIG. 3.

Referring now more specifically to the drawings, reference numeral 10 is used to generally designate the leveler comprising the instant invention. The leveler 10 has all of the snow engaging operating components thereof mounted on an elongated rectangular frame 12 comprising a pair of laterally spaced side beams or rails 14, a forward cross beam 16 extending between and interconnecting the forward ends of the side beams 14, and a rear cross beam 18 overlying and interconnecting the rear ends of the side beams 14. The side beams 14 and the front cross beam 16 are preferably in the nature of outwardly directed channel members so as to combine both strength and relative lightness, The rear cross beam 18, which as indicated overlies and is secured to the tops of the rear ends of the side beams 14, will normally be an angle member with the vertical flange thereof orientated toward the rear of the frame 10.

A pair of skis or ski-like skids 20 are secured to the front cross beam 16 at laterally spaced points thereon so as to support the forward end of the frame for travel over the snow surface. Each of the skis 20 includes a centrally located verti-cally upwardly projecting mounting rod or shaft 22 which is slidably received through an elongated sleeve 24 welded to the rear face of the front cross beam 16 whereby an adjustment in the vertical height of the front of the frame 12 can be effected. In order to fix the height of the frame in any of a plurality of vertically adjusted positions, each of the ski shafts 22 is provided with a series of apertures 26 therethroug'h which selectively align with a pair of opposed openings in the sleeve 24 immediately above the cross beam 16 for the selectivereception of an appropriate pin or bolt 28 therethrough. If desired, a short protective housing, defined by side and front vertically projecting plates 30, can be provided on each ski 20 about the lower end of the ski mounted shaft 22. In addition, if deemed desirable, short stabilizing rudders 32 can be provided on each ski 20. As will be appreciated from the drawings, the skis 20 generally centrally underlie the front cross beam 16 and are provided with slightly upturned leading ends for ease of movement over the rough humped trail surface to be encountered thereby. Likewise, the frame itself can have the front slightly raised relative to the rear for ease in passing over obstacles.

The trailing end of the frame 12 will normally also be supported on a pair of laterally spaced skids 34. Each of these skids 34 mounts on the opposed ends of an upwardly bowed leaf spring 36 which is in turn centrally secured to an appropriate mounting bracket 38 affixed to the rear elevated cross beam 18. The utilization of a leaf spring type mounting provides for a slight floating action to the rear of the frame which assists in providing the desired softened or fluffed snow condition.

The actual pulverizing operation is initiated by a forwardly located bank of vertical snow cutting and turning discs 40. The discs are provided in two sets of three discs each, the discs being angled rearwardly and outwardly with the two sets diverging slightly from each other as will be best appreciated from FIG. 2. The discs 40 are freely rotatable upon engagement with the snow surface and are mounted on shafts 42 joumaled within appropriate support blocks 44 mounted on rearwardly and outwardly angled support bars 46 which are in turn fixed to a pair of crossbars 48 located to the front and rear of the discs 40.

Following the pulverizing discs 40 are three pairs of

blades

50, 52 and 54. The blades 50 have the forward ends thereof affixed, either directly or through filler plates 56, to the opposite ends of the cross beam 48 immediately rearward of the discs 40. The two blades 50 converge rearwardly and are secured, in laterally spaced relation to each other, to a cross beam 58 extending between and affixed to the opposed side rails 14. The second pair of blades 52 have engaged forward ends thereof affixed, either directly or through a mounting plate 60, to the cross beam 58 centrally between the converged rear ends of the forward blades 50. The blades 52 diverge rearwardly with the rear ends thereof engaged and affixed to a rearwardly located cross beam 62 adjacent the outer ends thereof. The final set of blades 54 have forward ends affixed to the cross beam 62, laterally outward of the rear ends of the blades 52.'The'se blades 54 converge rearwardly with the rear ends thereof terminating in laterally spaced relation to each other and fixed to a cross beam 64 positioned forward of the rear cross beam 18. The blades orientated in this manner will result in a lateral inward, outward and inward shifting and rolling of the disc pulverized snow so as to continue the pulverizing action and result in a final soft and fully reconditioned product.

Noting FIGS. 1 and 2, as well as the detail of FIG. 5, each of the

blades

50, 52 and 54 includes a substantially horizontal lower edge incorporating a laterally turned or directed flange 66 which tends to engage beneath and assist in elevating the disc cut snow. Each of the blades is of a gradually increasing height from the forward to the rear end thereof with the blade initially rising vertically and, along the upper portion thereof, arcing laterally to cause an over-rolling or turning effect on the encountered upper cut layer of snow. It will of course be appreciated that the discs and blades project below the peripheral frame 12 and at a depth sufficient so as to engage and recondition the upper layer of snow along a snowmobile trail whereon the snow has been packed by frequent travel thereon. The particular packing that occurs on snowmobile trails results, from the nature of the snowmobiles themselves, in a hard surface with multiple humps therein which make further riding both difficult and uncomfortable.

The leveler of the instant invention efiectively reconditions the upper layer of packed snow without disturbing the ground therebeneath and in an efficient manner which ultimately produces a relatively smooth layer of softened snow, such being ideal for snowmobile traffic. Also of significance is the fact that the leveler is so constructed as to be specifically adapted for trailing behind a snowmobile as suggested in FIG. 1. Appropriate tow chains or the like 68 will of course be provided.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention.

What is claimed as new is as follows:

1. A snow leveler for packed snowmobile trails and the like, said leveler comprising a frame, skid means supporting said frame for travel over the surface of snow, a series of snow pulverizing discs rotatably mounted transversely across the forward portion of said frame for initial pulverizing engagement with the snow, said discs being generally vertically orientated in a front-to-rear direction, and three pairs of snowturning blades mounted rearward of said discs for sequential engagement with the disc pulverized snow, the first pair of blades, immediately behind the discs, converging rearwardly from forward ends located adjacent the sides of the frame to rear inwardly converged ends, the second pair of blades commencing at converged forward ends immediately rearward of the converged rear ends of the first pair of blades and diverging rearwardly to terminate in rear laterally spaced ends, the third pair of blades converging rearwardly from forward ends positioned immediately outward of the diverged rear ends of the second pair of blades, said third pair of blades terminating in laterally spaced rear ends converged inwardly relative to the forward ends thereof, each blade including a substantially horizontal lower edge having a laterally turned or directedflange thereon for engagement beneath the disc pulverized snow, each blade, along the height thereof from the lower edge, curving slightly laterally to provide a turning effect to the snow engaged thereby, and each blade, along the length thereof, being of a progressively greater height from the forward end to the rear end.

2. The leveler of claim 1 wherein said discs are provided in two laterally spaced sets, the discs of each set being orientated in a rearwardly and outwardly directed inclination relative to the length of the leveler.

3. The leveler of claim 2 wherein said skid means includes a pair of pivotally adjustable front skis depending from the forward end of said frame.

4. The leveler of claim 3 wherein said skid means also includes a pair of ski-like members fixed to the rear of said frame and depending therefrom.

5. A snow leveler for packed snowmobile trails and the like, said leveler comprising a frame, surface engaging support means supporting said frame for travel over the surface of snow, and three pairs of snow-turning blades mounted on said frame for sequential engagement with the snow, the first pair of blades converging rearwardly from forward ends located adjacent the sides of the frame to rear inwardly converged ends, the second pair of blades commencing at converged forward ends immediately rearward of the converged rear ends of the first pair of blades and diverging rearwardly to terminate in rear laterally spaced ends, the third pair of blades converging rearwardly from forward ends positioned immediately outward of the diverged rear ends of the second pair of blades, said third pair of blades tenninating in laterally spaced rear ends converged in-' wardly relative to the forward ends thereof, each blade, along the height thereof from the lower edge, curving slightly laterally to provide a turning effect to the snow engaged thereby, and each blade, along the length thereof, being of a progressively greater height from the forward end to the rear end.

6. The leveler of claim 12 including a plurality of snow pulverizing discs rotatably mounted transversely across the forward portion of the frame forward of the first pair of blades.

7. The leveler of claim 13 wherein said discs are provided in two laterally spaced sets, the discs of each set being orientated in a rear-wardly and outwardly directed inclination relative to the length of the leveler with the sets of discs rearwardly diverging relative to each other.

Claims

1. A snow leveler for packed snowmobile trails and the like, said leveler comprising a frame, skid means supporting said frame for travel over the surface of snow, a series of snow pulverizing discs rotatably mounted transversely across the forward portion of said frame for initial pulverizing engagement with the snow, said discs being generally vertically orientated in a front-torear direction, and three pairs of snow-turning blades mounted rearward of said discs for sequential engagement with the disc pulverized snow, the first pair of blades, immediately behind the discs, converging rearwardly from forward ends located adjacent the sides of the frame to rear inwardly converged ends, the second pair of blades commencing at converged forward ends immediately rearward of the converged rear ends of the first pair of blades and diverging rearwardly to terminate in rear laterally spaced ends, the third pair of blades converging rearwardly from forward ends positioned immediately outward of the diverged rear ends of the second pair of blades, said third pair of blades terminating in laterally spaced rear ends converged inwardly relative to the forward ends thereof, each blade including a substantially horizontal lower edge having a laterally turned or directed flange thereon for engagement beneath the disc pulverized snow, each blade, along the height tHereof from the lower edge, curving slightly laterally to provide a turn-ing effect to the snow engaged thereby, and each blade, along the length thereof, being of a progressively greater height from the forward end to the rear end.

5. A snow leveler for packed snowmobile trails and the like, said leveler comprising a frame, surface engaging support means supporting said frame for travel over the surface of snow, and three pairs of snow-turning blades mounted on said frame for sequential engagement with the snow, the first pair of blades converging rearwardly from forward ends located adjacent the sides of the frame to rear inwardly converged ends, the second pair of blades commencing at converged forward ends immediately rearward of the converged rear ends of the first pair of blades and diverging rearwardly to terminate in rear laterally spaced ends, the third pair of blades converging rearwardly from forward ends positioned immediately outward of the diverged rear ends of the second pair of blades, said third pair of blades terminating in laterally spaced rear ends converged inwardly relative to the forward ends thereof, each blade, along the height thereof from the lower edge, curving slightly laterally to provide a turning effect to the snow engaged thereby, and each blade, along the length thereof, being of a progressively greater height from the forward end to the rear end.