U.S. patent number 3,739,859 [Application Number 05/167,293] was granted by the patent office on 1973-06-19 for snow leveler.
Invention is credited to Lawrence K. White.
United States Patent |
3,739,859 |
White |
June 19, 1973 |
SNOW LEVELER
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.
Inventors: |
White; Lawrence K. (Heafford
Junction, WI) |
Family
ID: |
22606762 |
Appl.
No.: |
05/167,293 |
Filed: |
July 29, 1971 |
Current U.S.
Class: |
172/145; 37/222;
172/178; 172/188; 172/393 |
Current CPC
Class: |
E01H
4/02 (20130101); E01H 4/00 (20130101) |
Current International
Class: |
E01H
4/00 (20060101); E01H 4/02 (20060101); A01b
005/00 () |
Field of
Search: |
;172/145,170,177-178,180-181,188,195,200,387,393,780,784-787
;37/10,41 ;280/19 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Pulfrey; Robert E.
Assistant Examiner: Rader; R. T.
Claims
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 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.
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 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.
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.
Description
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 6--6 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 therethrough which selectively align with a pair of
opposed openings in the sleeve 24 immediately above the cross beam
16 for the selective reception 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 journaled 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. These 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 effectively 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.
* * * * *