U.S. patent number 3,666,020 [Application Number 05/090,619] was granted by the patent office on 1972-05-30 for drags for snowmobile trails.
Invention is credited to Robert V. Hess.
United States Patent |
3,666,020 |
Hess |
May 30, 1972 |
DRAGS FOR SNOWMOBILE TRAILS
Abstract
Apparatus for leveling and conditioning snowmobile trails having
a substantially rigid elongate frame assembly and a series of
resilient snow gathering and distributing scoops formed from
sectors of pneumatic tire casings depending from the frame.
Inventors: |
Hess; Robert V. (Deerbrook,
WI) |
Family
ID: |
22223563 |
Appl.
No.: |
05/090,619 |
Filed: |
November 18, 1970 |
Current U.S.
Class: |
172/612; 37/219;
172/200; 15/236.06; 172/189; 172/684.5 |
Current CPC
Class: |
E01H
4/02 (20130101); A01B 31/00 (20130101) |
Current International
Class: |
A01B
31/00 (20060101); E01H 4/00 (20060101); E01H
4/02 (20060101); A01b 031/00 () |
Field of
Search: |
;172/612,613,682,685,687,733,765-767,771,200,189 ;37/41,123
;15/236R |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Pulfrey; Robert E.
Assistant Examiner: Eickholt; Eugene H.
Claims
I claim:
1. A drag for snowmobile trails comprising:
a. a substantially rigid elongate frame assembly, and
b. A series of resilient snow leveling scoops each comprising an
arcuate sector of at least about 90.degree. and not more than about
180.degree. of a pneumatic tire casing divided through the bottom
tread portion thereof along a plane extending transversely to the
axis of said tire casing, said series of snow leveling scoops being
spaced along the length of said frame assembly with the sidewall
portion of each of said sectors of tire casings forming said snow
leveling scoops secured to the underside of said frame assembly and
having the bottom tread portion extending in depending relation
from the rear edge of said sidewall portion.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention pertains generally to the field of material levelers
and more particularly to drags for leveling and smoothing
snowmobile trails.
2. Description of the Prior Art
Snowmobiling is a relatively new field of recreation yet a great
number of snowmobiles have already been sold in the rapidly
expanding market. By far the greatest number of these vehicles are
owned by private individuals who ride them for recreation over open
and wooded trails, fields, frozen lakes and similar areas.
Because of the vast number of snowmobiles coming into use,
snowmobilers are finding it increasingly difficult to locate
adequate open spaces to ride their machines, particularly around
the populated urban centers. Accordingly, many public and privately
owned snowmobile trails have been and are being developed.
These trails in both wooded and open areas are receiving a
relatively high concentration of use and therefore must be
faithfully maintained and groomed to provide safe and adequate
riding areas. To maintain these trails in good condition,
particularly between snow falls, it is necessary to smooth them out
and fill in areas that have had excessively hard use.
The art pertaining to levelers and drags for redistributing roadway
materials and reconditioning other traveled surfaces tends to be
quite old, most of which was developed in the early 1900's to
maintain dirt and gravel roadways for the passage of wagons, sleds,
and the early automobiles. These devices generally comprised drags
pulled behind horses for smoothing and leveling gravel, dirt and
snow. Such devices are typically shown in the following U.S.
patents issued around the turn of the century: U.S. Pat. Nos.
194,386; 765,542; 918,993; 987,803; 1,114,442 and 1,739,804. These
drags, of course, became obsolete with the takeover of the
automobile and the advent of motorized snowplows and graders. The
devices described in the prior art do not meet the need for
apparatus to condition and maintain snowmobile trails.
SUMMARY OF THE INVENTION
Because roadway drags were generally obsolete long before the
snowmobile was even envisioned, it is not surprising that none of
the known devices adequately meet the needs of modern snowmobiling.
According, I have invented a new snow drag specifically for
conditioning and maintaining snowmobile trails to meet the demands
of this ever growing sport.
Because most snowmobiling is done by individuals and small groups
and most trails are maintained by same, I have designed my
snowmobile drag to be economically built. Further, noting the
generally rough terrain over which snowmobile trails are made, I
have made my drag of a minimum of parts solidly constructed from
rugged materials.
The leveling scoops of my drag are made of resilient material,
specifically automobile or truck tire casings, so that the drag
will bounce over obstacles and giveway and release from the ever
present snags in the trailways. The resilient rubber scoops also
add buoyancy to the drag to keep it from sinking or cutting too
deeply into the snow which would result in the undesirable plowing
and cutting away of the snow rather than the required leveling and
filling effect.
Recognizing also the need to transport the snowmobile drag, I have
made the drag in such a manner that it may be conveniently
transported on a conventional snowmobile trailer alongside a
snowmobile or even on the top of an automobile.
Further objects, features and advantages of my invention will be
apparent from the following detailed description taken in
conjunction with the accompanying drawings wherein a preferred
embodiment of the invention has been selected for
exemplification.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an isometric view of a drag for conditioning snowmobile
trails exemplifying my invention.
FIG. 2 is a partial bottom plan view of the drag in FIG. 1 showing
the underside of a scoop thereof.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now more particularly to the drawings where like numerals
refer to like parts throughout the several views, my snowmobile
trail drag is indicated generally at 20 in FIGS. 1 and 2.
As best seen in FIG. 1, the drag 20 has a substantially rigid
elongated frame assembly 21 comprising longitudinal angle iron
members 22 and 23 and cross support members 24 preferably welded or
bolted thereto. A chain 25 is secured at holes 26 formed in the
forward end of each longitudinal member 22. A ring 27 is secured to
the middle link of the chain for hitching to a snowmobile for the
purpose of pulling the drag therebehind.
A series of resilient rubber snow gathering and leveling scoops 28
are spaced one behind the other along the length of the frame
assembly as shown in FIG. 1. Each scoop comprises an arcuate sector
of at least about 90.degree. and not more than about 180.degree. of
a pneumatic tire casing from an automobile, truck, or the like,
divided through the bottom tread portion thereof along a plane
extending transversely to the axis of rotation of the tire
casing.
Each sector of tire casing forming the snow scoops is secured to
the underside of the frame assembly by bolts 29 extending through
the longitudinal frame members and the sidewall portion 28a of the
tire casings. The side wall portions 28a of the casings extend
rearwardly from their point of attachment to the depending thread
portion of the casings 28b.
It should be noted that the scoops 28 can be made from any diameter
size tire casing from an automobile, truck or the like depending on
the width of the trail desired. The arcuate size of said scoops may
also be varied, although it is preferred to make the scoops from
sectors of about 90.degree. to about 120.degree.. The arcuate
sector for the scoop shown in FIG. 2 is 120.degree.. This
particular arcuate size has proven to give excellent gathering,
distributing and smoothing action.
The use of discarded tire casings is the most significant factor is
achieving a low cost drag and it should be noted that when using
120.degree. sectors, six scoops can be obtained from a single tire
casing.
It is understood that my invention is not confined to the
particular construction and arrangement of parts herein illustrated
and described, but embraces all such modified forms thereof as come
within the scope of the following claim.
* * * * *