Patent Publication Number: US-6698111-B2

Title: Snow trail grooming accessory and method

Description:
FIELD OF THE INVENTION 
     The present invention relates generally to a snow trail grooming accessory for use with a snowmobile. More specifically, the invention concerns a trail grooming accessory for use with an operating snowmobile to prevent the initial formation of snow moguls, snow mounds and the like, and also, to aid in leveling a snow trail affected by existing snow moguls, snow mounds and the like. 
     BACKGROUND OF THE INVENTION 
     Various snow trail grooming devices exist in the art. Many of the known prior devices resemble towable sled devices hitched behind a vehicle for towing over a snow trail to groom the same. These devices are designed for use with personal motor craft (e.g., a snowmobile and the like) and industrial type towing vehicles. Of these, only the devices for use with a personal motor craft vehicle are intended for towing behind a snowmobile under operating conditions, i.e., at operating speeds while traveling over a snow trail. These devices can serve their intended purpose rather well, especially when one desires to tow a load of articles behind the vehicle while also performing snow grooming. However, when one does not desire to tow such a device behind their vehicle but still desires to conduct snow trail grooming while operating the vehicle, a more compact and economical trail grooming device is needed. 
     As appreciated by one of ordinary skill in the art, and moreover by the average snowmobile operator, most snowmobiles are driven by a centrally located track which comes into contact with a ground surface (e.g., usually snow), over which the snowmobile travels. During operation of the snowmobile, and particularly upon commencing forward travel, the snow engaging portion of the track moves from the front of the snowmobile to the back of the snowmobile. The track lifts some of the snow it contacts and displaces or sprays it backwards to a back track location where the track looses contact with the snow covered surface upon initial forward movement. As a result of the snow displacement or spray effect, a pile of snow is usually deposited just behind the position where the back end of the snowmobile was located. 
     If this pile is left alone, it merely represents a mound of snow in the snowmobile path or trail. If this pile is traveled over by other snowmobiles it is compacted and eventually forms a mogul or the like. In either case, this pile of snow creates a disturbance in the snowmobile trail. Such a disturbance is sometimes desirable to provide a more challenging snowmobile ride. However, even just one of these disturbances can make operating a snowmobile difficult given the unlevel or uneven snow surface on the snow trail. Furthermore, when considering a popular snow trail, it is evident that over a period of time and with many snowmobiles traveling over the same trail, the snow mound or snow mogul effect will be multiplied and the difficulty or lack of comfort to the snowmobile operator could become quite significant. 
     To a somewhat lesser degree, but still significant and particularly so depending on snow moisture conditions, during operation of the snowmobile over a snow trail, a snow spray is continuously propelled outward and upward from the back of the snowmobile, but not usually at a constant rate. The amount of snow spray depends on the speed of the snowmobile and the snow moisture conditions. Thus, in the ordinary course of operating the snowmobile, simply changing speeds can, regardless of moisture conditions, vary the amount of snow sprayed whereby any positive differential amount will cause a snow mound, and in due course over time a mogul or the like. 
     One way to deal with the snow mounds, snow moguls and the like is to remove them well after they have formed, i.e., with equipment that is proposed by some prior art devices. Such an approach is commendable, however, it can ignore the bigger part of the problem, namely, the creation of snow mounds, snow moguls and the like in the first place. Furthermore, with some prior art devices, although they remove the snow mounds, moguls and the like, solving one problem, such action often creates another problem. Over a short period of time, employing merely a device or method that removes the trail disturbance well after its formation tends to form a snow trail rut where the prior art device has scraped over the snow trail and pushed the loose snow off or out of the sides of the device. As is obvious in geographic locations where there is not a steady supply of new snow or a substantial snow base, such a scrapping action significantly displacing the snow trail snow would destroy a snowmobile trail in a short period of time. 
     Accordingly, a more compact and economical trail grooming accessory, which can be directly attached to a snowmobile, is needed. Further, such a device will desirably include the features of enabling trail grooming while operating the snowmobile, in order to prevent the initial formation of snow mounds, moguls and the like, and with minimal disturbance to the natural snow covered condition of the snow trail. 
     SUMMARY OF THE INVENTION 
     In one aspect of the invention, I have provided a snow trail grooming accessory for use with an operating snowmobile to groom a snow trail during operation of the snowmobile. The snow trail grooming accessory includes at least one mounting arm, the mounting arm being mountable directly to a track suspension of the snowmobile. The accessory also includes a snow collector/leveler secured to the mounting arm wherein when the mounting arm is mounted to the operating snowmobile the mounting arm and the snow collector/leveler are pulled behind the snowmobile with the snow collector/leveler substantially skimming over a level portion of the snow trail and the snow collector/leveler impacting at least a portion of a snow mound, a snow mogul or a snow displacement in the snow trail. 
     In another aspect of the inventions, I have provided a snow trail grooming accessory for use with an operating snowmobile to groom a snow trail during operation of the snowmobile. The snow trail grooming accessory includes at least one mounting arm, the mounting arm being mountable directly to a track suspension of the snowmobile and being substantially fixed in position relative to the track suspension when mounted thereto. The accessory also includes a snow collector/leveler secured to the mounting arm wherein when the mounting arm is mounted to the operating snowmobile the mounting arm and the snow collector/leveler are pulled behind the snowmobile with the snow collector/leveler substantially skimming over a level portion of the snow trail and the snow collector/leveler impacting at least a portion of a snow mound, a snow mogul or a snow displacement in the snow trail. 
     In still another aspect of the invention I have provided a snow trail grooming accessory for use with an operating snowmobile to groom a snow trail during operation of the snowmobile. The snow trail grooming accessory includes a snow collector/leveler mountable to the snowmobile, the snow collector/leveler includes a tubular shell defining a temporary retention chamber therein which is adapted to receive snow from the operating snowmobile or a snow trail through at least one opening in communication with the temporary retention chamber. The temporary retention chamber includes a portion that is substantially bounded by a circumference of the tubular shell and the temporary retention chamber having a longitudinal axis wherein the temporary retention chamber is oriented in a non-parallel direction as defined by the longitudinal axis relative to a longitudinal axis of the snowmobile. 
     In yet another aspect of the invention, I have provided a method for grooming a snow trail with an operating snowmobile. The method includes mounting a snow trail grooming accessory directly to a track suspension of the snowmobile; and pulling the snow trail grooming accessory behind the operating snowmobile wherein the snow trail grooming accessory substantially skims over a level portion of the snow trail and the snow trail grooming accessory impacts at least a portion of a snow mound, a snow mogul or a snow displacement in the snow trail. 
     In still other aspects of the invention, I have provided a pair of mounting arms which mount the snow collector/leveler to the snowmobile, a cross member for mounting the snow collector/leveler to the snowmobile, and various configurations and characteristics of the snow collector/leveler. 
     In accordance with the following, the present invention advantageously provides a way of slicing up snow mounds, snow moguls and the like, immediately upon formation, with a compact grooming accessory mountable to an operating snowmobile. The invention may advantageously pull or draw snow trail disturbances forward into crevices or valleys where the snow trail surface is of a lower height than the average snow trail surface of a snowmobile trail, thereby smoothing out bumpy snow surfaces while traversing a snowmobile trail. The invention may advantageously at least partially deflect a portion of a snow spray or displacement of an operating snowmobile moving over a snowmobile trail. The invention may advantageously provide a snow trail grooming accessory that enables the snowmobile to be conventionally operated in a forward or reverse direction of travel and loaded on to and off of a towing trailer without having to adjust or remove the snow trail grooming accessory from the snowmobile. 
     These and other features and advantages of my invention will become more readily apparent upon reference to the following description when taken in conjunction with the accompanying drawings, which drawings illustrate several aspects of my invention. 
    
    
     DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a front top perspective view of a snow trail grooming accessory in accordance with the teaching of the invention. 
     FIG. 2 is a top view of the accessory of FIG.  1 . 
     FIG. 3 is a front view of an accessory of the invention similar to that of FIG.  1 . 
     FIG. 4 is a back right side view of the accessory of FIG. 3, but now mounted to a snowmobile. 
     FIG. 5 is a back left side view of the accessory of FIG. 1, but now mounted to a snowmobile. 
     FIG. 6 is a back view of the accessory of FIG.  4 . 
     FIG. 7 is a front top perspective view of another snow trail grooming accessory in accordance with the teaching of the invention. 
     FIG. 8A is a schematic side view of a portion of the accessory of the invention in a home position before impacting a snow trail disturbance or snow trail hazard. 
     FIG. 8B is a schematic side view of a portion of the accessory of the invention in a deflected position upon impacting a snow trail hazard. 
     FIG. 9 is cross sectional view of a portion of the mounting arm taken along the line  9 — 9  of FIG.  2 . 
     FIG. 10 is cross sectional view of two different portions of the mounting arm taken along the lines  10 — 10  of FIG.  2 . 
     FIG. 11 is cross sectional view of a portion of the mounting arm taken along the line  11 — 11  of FIG.  7 . 
     FIG. 12 is cross sectional view of a portion of the snow collector/leveler taken along the line  12 — 12  of FIG.  1 . 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring generally to the drawings, and particularly FIGS. 1 and 4 to  6  for example, there is seen a snow trail grooming accessory  30  for use with a snowmobile  10  to groom a snow trail  100  during operation of the snowmobile. The snowmobile  10 , or operating snowmobile  10  during operation of the same, can be most any conventional snowmobile. As such, snowmobiles  10  have a track suspension  12  which includes, among other components, a track slide rail  14 , a rear idler wheel  18  proximate a back end  20  of the snowmobile, and a track  22  of the snowmobile for assisting in propelling the snowmobile. The track  22  has a bottom surface  24  (i.e., a constantly changing rotating surface during operation of the snowmobile) which engages the snow trail  100  and generally defines a horizontal plane relative to a level portion  102  of the snow trail except when there may be a snow trail disturbance  104  as discussed hereafter. On either side of the snowmobile are seen opposite sides  16  of the track suspension. A longitudinal axis  26  of the snowmobile extends from its front end to its back end  20 . During operation, the operating snowmobile  10  can travel in a forward direction  28  or an opposite reverse direction  29 . 
     A tunnel assembly  13  is located over the suspension  12 . The assembly  13  includes, among other components, a rider&#39;s seat and rear bumper and snow flap. Tunnel assembly  13  is maintained in place over the suspension  12  by, at least in part, a suspension spring system (not shown). A relationship between the suspension spring system and the rider&#39;s seat and rear bumper contributes to snowmobile handling characteristics and rider comfort for the snowmobile. That is, the spring suspension system is dependent upon, at least in part, the weight and distribution thereof for the rider&#39;s seat and rear bumper to determine certain snowmobile handling characteristics and rider comfort. Thus, changes in the weight, or distribution of weight, by the rider&#39;s seat and rear bumper can alter the snowmobile handling characteristics and rider comfort, and often times dramatically alter this relationship beyond specification ranges intended or desired by the snowmobile manufacturer. Additionally, this can contribute to the advantage of a snow trail grooming accessory being mounted to the track suspension which tends to be greatly in contact with the snow trail (i.e., and thus so will the accessory mounted thereto), as opposed to the grooming accessory being mounted to the tunnel assembly which is normally in constant flux of height relative to the snow trail during operation of the snowmobile. 
     Referring to all the figures, and particularly FIGS. 1 to  3 , the snow trail grooming accessory  30  can include at least one mounting arm  32 , where the mounting arm  32  is mountable directly to the track suspension  12  of the snowmobile. In one aspect of the invention, this advantageously provides the height and position of the mounting arm(s)  32 , relative to the snow trail  100 , being controlled by only those parts of the snowmobile in contact with the snow trail surface, namely, the track suspension  12 . Without being limited to a theory of operation, this is believed to be beneficial for on-the-move snow trail disturbance elimination at the time of creation of the disturbance. In another aspect of the invention, this advantageously maintains normal snowmobile handling characteristics and rider comfort for the snowmobile even when the grooming accessory  30  is mounted to the operating snowmobile  10  because accessory  30  is not mounted to the rider&#39;s seat or rear bumper or in other ways does not interfere with the spring suspension system. 
     More particularly, the arm  32  can be mounted to the track slide rail  14 , for example, at an end portion or second end portion  36  by way of any suitable mechanical fastening relationship  48  (e.g., bolt, screw, pin, rivet, etc. into slide rail  14  or welding or bonding to slide rail  14 ). Alternatively or additionally, arm  32  can be mountable to the track suspension  12  at the rear idler wheel  18  at the end portion  36  of the mounting arm, also by any suitable mechanical fastening relationship  48  (e.g., bolt, screw, pin, rivet, etc. into idler wheel  18  or welding or bonding to idler wheel  18 ). When the arm(s)  32  is mounted to the idler wheel  18  and the slide rail  14  (or other component fixed relative to the position of idler wheel  14  or vice versa), the arm(s) can be mounted to the track slide rail  14  at a distal end portion  40 . Thereby, the end portion  36  and the distal end portion  40  can be spaced apart and thus the pair of mounting arms can be fixedly mountable relative to the track suspension  12  (i.e., and because the idler wheel  18  is fixed relative to slide rail  14  except for rotational movement of the idler wheel  18  relative to the slide rail). With any of these mountings to the track suspension, it may often be desirable to space the arm  32  from the idler wheel  18 , track  22  and any other moving parts of the propulsion system, to prevent interference between the arm  32  and these components during operation of the snowmobile (e.g., by use of any conventional spacer  41  between the inside surface of the arm  32  and the idler wheel  18 , which space can desirably be between about ½ inch (1.25 cm) and about 1½ inches (3.75 cm). The mounting arm can be permanently mounted to the track assembly or removably (i.e., semi-permanently) mounted to the track assembly, each by conventional techniques or those discussed herein. 
     The mounting arm  32  can, advantageously, be a pair of mounting arms  32  that are near identical except a mirror image of each other. With such a pair of arms, each can be mounted directly to opposite sides  16  of the track suspension  12 . A cross member  90  can be positioned between the second end portion  36  of each arm  32 . The cross member can be formed separate from the arm  32  and joined thereto or formed together with the arm  32 . The cross member can serve to fix the second end portions  36  of each arm  32 , as well as secure the snow collector/leveler  50 . The mounting arm  32  can have a tubular cross-sectional dimension  44  (FIGS.  2  and  9 ), a flat cross-sectional dimension  46  (FIGS. 2,  7 ,  10  and  11 ), a hollow or solid core to either dimension  44  or  46 , or any other dimension that assists in providing the advantageous rigid features of the arm  32 . In this regard, the arm  32  can be made of any of a variety of materials as long as they provide a relatively rigid, stiff characteristic along a longitudinal axis  42  of the arm, and an at least semi-rigid to rigid characteristic along a horizontal axis (i.e., perpendicular to axis  42  and extending between arms  32 ). The cross member  90  can also have rigid characteristics along its length similar to the arm  32 , and could similarly have the tubular cross-sectional dimension, the flat cross-sectional dimension, the hollow or solid core to either dimension, or any other dimension that assists in providing the advantageous rigid features of the cross member  90 . 
     The arm(s) can have a first end portion  34  spaced from the second end portion  36 . The snow collector/leveler  50  can be securable to the first end portion  34  and the end portion or second end portion being mountable to the track suspension  12  as discussed above. More particularly, the snow collector/leveler  50  can be secured to the first end portion by, e.g., attachment with cross member  90  by any suitable mechanical fastening relationship (e.g., bolt, screw, pin, rivet, etc. into cross member  90  or welding or bonding to member  90 , and with or without washers as desired) or forming therewith. Arm(s)  32  can have a projecting portion (e.g., upward or downward) at second send portion or end portion  36  as desired for positioning the snow collector/leveler as taught herein. 
     Another aspect of the invention concerns the snow collector/leveler  50  also for use with the operating snowmobile  10  to groom the snow trail  100  during operation of the snowmobile. Collector/leveler  50  is configured to both collect snow from the snow trail for temporary retention therein and to level portions of the snow trail (e.g., snow trail disturbances), during operation of the snowmobile. The snow collector/leveler is mountable to the snowmobile, e.g., through use of the mounting arm(s)  32  taught herein or other techniques known in the art (such as those discussed in U.S. Pat. No. 6,026,600 of Lela or U.S. Pat. No. 6,094,845 of Lela or art discussed in these two patents, all which is incorporated herein by reference). The snow collector/leveler includes a tubular shell  52  which defines a temporary retention chamber  54  therein. Shell  52  could be of most any tubular shape, e.g., cylindrical, triangular, square, pentagonal to hexagonal, etc., as long as the shell is oriented to avoid positioning any corner(s) against the snow trail which could significantly plow snow in the snow trail rather than substantially skim over the snow trail surface. The shell can be made from a variety of materials as long as they have one or more of the characteristics that may be desired as taught herein. For example, a conventional five gallon bucket made of high density polyethylene (HDPE) could be used. For similar reasons, it is believed that this and other plastics having a thickness in the range of about 2 mm to about 4 mm could be used to make the collector/leveler  50 . 
     The chamber  54  is adapted to receive snow from the operating snowmobile or the snow trail through at least one opening in communication with the temporary retention chamber. The at least one opening can be located in a front portion  58  of the tubular shell such as openings  56  or located in an end  66  of the tubular shell and advantageously both opposite ends such as second openings  64 . Each opening is in communication with the temporary retention chamber  54 . The opening(s)  56  can have a lower edge  60  (FIGS. 1 and 12, e.g.) which terminates in a range from before to after a tangent line  62  formed relative to the tubular shell and the snow trail, and advantageously before or after tangent line  62 . The tubular shell also includes a closed surface  70  located at a back portion  72  of the tubular shell. 
     The chamber  54  includes a portion that is substantially bounded by a circumference of the tubular shell, for example, any of ribs  68  in combination with adjoining back portion  72  circumferentially therewith. The temporary retention chamber has a longitudinal axis  74  which is oriented in a non-parallel direction, and advantageously close or equal to substantially perpendicular, as defined by the longitudinal axis relative to the longitudinal axis  26  of the snowmobile. Each of the at least one opening, the closed surface and the longitudinal orientation, alone and in combinations, contribute at least in part to a portion of the snow from the operating snowmobile or the snow trail being temporarily retained in the chamber and redirected upon exit therefrom rather than passing straight through the chamber if the chamber were in parallel with the longitudinal axis of the snowmobile. 
     The desired width of the snow collector/leveler is generally about the same as or less than a width of the snowmobile track  16 , because it is the spin of the track and snow spray therefrom which causes the formation of a snow trail disturbance  104  (e.g., a snow displacement or spray, a snow mound, or snow mogul). The desired outside diameter of the snow collector/leveler, for analogous reasons, is generally about the same size as or less than a height of the track suspension. For example, for a Polaris™ 1994 year, model Trail Touring snowmobile, the width of the snow collector/leveler can be in the range of about 12 inches (30 cm) for a snowmobile track width of about 15 inches (37.5 cm)(e.g., centering the collector/leveler relative to the track width and using three ribs  68  each about two inches wide with two openings  56  each about three inches wide). More importantly, for example, the width of the collector/leveler can be in the range of about 50% to about 125% of the width of the track of the snowmobile. The outside diameter of the snow collector/leveler can be in the range of about 6 inches to about 18 inches (15 cm to 45 cm), depending on the type and lug style of the snowmobile track. 
     When employing a plurality of openings  56  in the front portion  58 , each opening  56  is preferably spaced from each adjacent opening  56  by rib  68  or similar structure. In this way, the portion of the circumference of the tubular shell located within the front portion  58  of the tubular shell serves to deflect at least a portion of the snowmobile snow spray or displacement in a downward direction while allowing a portion to pass through the opening(s) adjacent thereto and into chamber  54 . As such, this arrangement enables the snow collector/leveler to displace forward a portion of a snow mound, a snow mogul or a snow spray or displacement, without displacing forward all of the same and likely causing an undesirable snow trail rut over time, or causing undue strain on the collector/leveler when encountering a snow trail hazard. 
     In one aspect of the invention, when the snow collector/leveler is securable to the cross member it can be located in an offset position  92  relative to the cross member (FIGS. 3 and 4, e.g.). Such an offset position is defined as any location in the tubular shell  52  where there is more of the circumference of the shell above than below, and vice versa, a horizontal axis  94  including cross member  90 . Stated another way, position  92  is any location in the tubular shell that is above or below horizontal axis  96  which includes the cross-sectional center of tubular shell  52 . Particularly, for example, the offset position can be located above the axis  96 , such as position  92 , so that more than half of the circumference of the shell  52  extends below cross member  90 . In this way, a downward force  86  can be imparted upon the back portion  72  by the mere distribution of weight of the shell  52  relative to the cross member  90  (i.e., more weight below axis  94  than above it). Additional ways the downward force  86  can be imparted upon the collector/leveler  50  can include the use of springs, rubber members, or torsion arms, each mounted between the collector/leveler and either the cross member  90  or arm(s)  32 . 
     In another aspect of the invention, and referring to FIGS. 8A and 8B, which aspect can complement or be independent of, the offset position  92 , when the snow collector/leveler is securable to the cross member the snow collector/leveler can have a flexible/resilient characteristic which allows a portion of the snow collector/leveler  50  to pivot relative to the cross member  90 . Additionally, or alternatively, it can be advantageous for the collector/leveler to also pivot between a home position  82  and a deflected position  84  relative to a horizontal plane defined by the bottom surface  24  of the track  22  of the snowmobile. Additionally, or alternatively, and depending on whether the collector/leveler is mounted to the arm(s) directly or to the cross member which is secured to the arm(s), the collector/leveler  50  may be able to pivot relative to the longitudinal axis  42  of the mounting arm. For example, FIGS. 8A and 8B show the collector/leveler pivoting relative to the substantially fixed longitudinal axis  42  of the mounting arm (i.e., and thus also the cross member secured thereto) as the collector impacts a snow trail hazard  106 . The deflected position can be advantageous to avoid or mitigate the effect of the hazardous snow trail disturbance  106  such as a rock, tree limb or other relatively fixed ground structure, as well as excessively large snow trail disturbances. Additionally, or alternatively, it may be advantageous for the snow collector/leveler to have a memory characteristic which maintains the snow collector/leveler in the home position when the snow collector/leveler is not impacting at least the portion of the snow mound, the snow mogul or the snow displacement in the snow trail. Additionally, or alternatively, it may be advantageous for the snow collector/leveler to include an at least partially downward force, such as force  86  and by the same or similar techniques discussed previously, when the snow collector/leveler is in the home  82  position and when the snow collector/leveler is in the deflected position  84 . When in the home position, such a downward force can assist in maintaining the collector/leveler in contact with the snow trail surface, for example. When in the deflected position, such a downward force can assist in returning the collector/leveler to the home position, for example. 
     The flexible/resilient characteristic and the memory characteristic can be obtained by various techniques. The flexible/resilient characteristic defines the snow collector/leveler being both flexible and resilient. The memory characteristic defines the collector/leveler as being able to return to a substantially same first position after being moved from the first position by some force. Each of these characteristics can be obtained by, e.g., construction of the tubular shell out of plastic, rubber, or materials or composite materials with properties that allow for retaining shape and durability even when subject to being hit and battered by a snow trail disturbance and particularly a snow trail hazard. Other ways to obtain these characteristics can include the use of springs, rubber members, or torsion arms, each mounted between the collector/leveler and either the cross member  90  or arm(s)  32 ; or a combination of any of these or other similar techniques. 
     The offset position  92  of the snow collector/leveler  50  provides additional mass at the bottom portion of the collector/leveler  50  that is nearest the snow trail  100  and assists the collector/leveler  50  in breaking up a snow trail disturbance upon impacting the same. Also, the upward projection of the bottom portion of the tubular shell  52  away from the snow trail enables the collector/leveler  50  (i.e., the whole accessory  30 ) to be moved in a reverse direction  29  of travel, without having to specially manipulate the accessory  30  or detach the same from the snowmobile, when operating the snowmobile in the reverse direction  29  or when loading the snowmobile on to or off of a towing trailer. 
     To varying degrees, each of the just discussed features of the collector/leveler  50  concerning offset positioning, the flexible/resilient characteristic, pivoting between the home and deflected positions, the memory characteristic, and the downward force, can advantageously assist the snow collector/leveler, and thus the grooming accessory  30 , in on-the-move (i.e., with an operating snowmobile) snow trail grooming to prevent the initial formation of snow moguls, snow mounds and the like, and also, to aid in leveling a snow trail affected by existing snow moguls, snow mounds and the like. 
     In operation, e.g., referring to FIGS. 4 to  6 , the snow collector/leveler  50  is secured to the mounting arm which in turn is mounted to the operating snowmobile. As such, the mounting arm and the snow collector/leveler are pulled behind the snowmobile with the snow collector/leveler substantially skimming over (e.g., advantageously between about one inch (1 cm) above and below the trail surface, more advantageously between about one-half inch (1.25 cm) above and below the trail surface, still more advantageously between about one-quarter inch (0.625 cm) above and below the trail surface, yet more advantageously about even to less than about one-half inch (1.25 cm) above the trail surface) the level portion of the snow trail and the snow collector/leveler impacting at least the portion of the snow trail disturbance (e.g., snow mound, the snow mogul or the snow displacement). Advantageously, the snow collector/leveler is mounted behind the snowmobile so there is a space  80  completely separating the collector/leveler  50  from the back end  20  of the snowmobile (i.e., the back most part of the tunnel assembly or back of the track, whichever is closer to the collector/leveler). Space  80  can be in the range of, and in increasing degrees of advantage, between about 24 inches (60 cm) to about 1 inch (2.5 cm), between about 18 inches (45 cm) to about 2 inches (5 cm), and between about 12 inches (30 cm) to about 3 inches (7.5 cm). Also, depending on the size of the space and the snowmobile, the snow flap may need to be modified or removed to allow the snow spray to effectively communicate with the collector/leveler or prevent undesirable interference between the snow flap and the grooming accessory. 
     For example, as the track  22  spins it causes excessive snow spray to discharge from under it where it contacts the adjacent snow trail  100 . Some of the excessive spray is immediately bounced sideways and downward off the ribs  68  of the collector/leveler  50  and back onto the snow trail. Some of the excessive spray enters the chamber through opening(s)  56  and is temporarily retained in chamber  54  at a first time and then released out opening(s)  64  or  56  at a subsequent time during operation of the snowmobile. Additionally, some volume of snow from the snow trail or a snow trail disturbance can be scooped up through opening(s)  56  and also temporarily retained in chamber  54  at a first time and then released out opening(s)  64  or  56  at a subsequent time during operation of the snowmobile. As the snow volume increases in the collector/leveler, it is forced out the opening(s)  64  or  56  in the collector/leveler at a regulated rate during normal operation of the snowmobile, thereby eliminating large piles of snow left on the snow trail surface. For example, as the snowmobile travels forward and the collector/leveler vibrates due to normal shaking of the track suspension system, snow in the temporary retention chamber gradually disperses along the snow trail. 
     In yet another aspect, the invention relates to a method for grooming snow trail  100  with operating snowmobile, e.g., snowmobile  10 . Steps for the method are now discussed in no particular order, except advantageous orders for certain steps may be mentioned relative to one another without limiting that particular ordering. The method includes mounting a snow trail grooming accessory, e.g., accessory  30  or through use of another structure with similar function, directly to the track suspension  12  of the snowmobile. The method also includes, and advantageous next, pulling the snow trail grooming accessory behind the operating snowmobile such that the snow trail grooming accessory substantially skims over the level portion  102  of the snow trail  100  and the snow trail grooming accessory impacts at least a portion of the snow trail disturbance  104  (e.g., snow mound, snow mogul or snow displacement). 
     The method can further include maintaining the snow trail grooming accessory in a substantially fixed position relative to the track suspension, e.g., by use of arm (s)  32  in one or more manner discussed previously or through use of another structure with similar function. Advantageously, mounting can be mounting a pair of mounting arms, e.g., arms  32  or use of another structure with similar function, to opposite sides of the track suspension, and can also include securing a snow collector/leveler, e.g., collector/leveler  50  or use of another structure with similar function, to the mounting arms. Still more advantageously, mounting can include positioning a cross member, e.g., member  90  or use of another structure with similar function, between the mounting arms and securing the snow collector/leveler to the cross member. 
     The method can then further include maintaining the snow trail grooming accessory in a substantially fixed position relative to the track suspension and maintaining a space, e.g., space  80 , completely between the snow collector/leveler and the back end  20  of the snowmobile. Still further, the method can then include temporarily retaining at least a portion of the snow spray produced by the operating snowmobile  10  at a first time and then releasing at least the portion of the snow spray out at least one end, e.g., end(s)  66 , of the snow collector/leveler at a subsequent time during operation of the snowmobile. Yet further, the method can include pivoting the snow collector/leveler between a home position, e.g., position  82 , and a deflected position, e.g., position  84 , relative to a horizontal plane defined by the bottom surface  24  of the track  22  of the snowmobile. These steps of the method can be, and when done are, performed for reasons analogous to those discussed previously for similar structures of the invention. 
     All components of the invention, unless specifically limited previously, can be constructed of a rigid material, such as steel, aluminum, plastic, hard rubber, etc. Further, it is believed that all such components of the invention can be constructed of a rust resistant rigid metal material (e.g., galvanized steel) or have a rust resistant coating to enhance the durability and longevity of the components. 
     As various possible embodiments may be made in the above invention for use for different purposes and as various changes might be made in the embodiments above set forth, it is understood that all of the above matters here set forth or shown in the accompanying drawings are to be interpreted as illustrative and not in a limiting sense.