U.S. patent application number 12/924696 was filed with the patent office on 2012-04-05 for plow back blade for snow removal.
Invention is credited to Paul E. Dimario.
Application Number | 20120079749 12/924696 |
Document ID | / |
Family ID | 45888603 |
Filed Date | 2012-04-05 |
United States Patent
Application |
20120079749 |
Kind Code |
A1 |
Dimario; Paul E. |
April 5, 2012 |
Plow back blade for snow removal
Abstract
The disclosure relates to a device and method of use of a plow
back blade for snow removal. The plow back blade is attached to a
snowplow or snow blower to assist with removing snow from areas
that are otherwise difficult to access with conventional snow
removal equipment. The plow back blade is rotatably attached to a
snowplow blade at a pivot point. The plow back blade is engaged
into a locked position as the vehicle moves in reverse to assist
with the scraping of ice and packed snow from pavement. The plow
back blade enters a free position as the snowplow plows in its
forward position which also sharpens the plow back blade lower
edge. Furthermore the plow back blade allows additional
applications for snowplows and snow blowers such as dirt
leveling.
Inventors: |
Dimario; Paul E.; (Salem,
NH) |
Family ID: |
45888603 |
Appl. No.: |
12/924696 |
Filed: |
October 4, 2010 |
Current U.S.
Class: |
37/266 |
Current CPC
Class: |
E01H 5/068 20130101;
E02F 3/8155 20130101 |
Class at
Publication: |
37/266 |
International
Class: |
E01H 5/06 20060101
E01H005/06 |
Claims
1. A snowplow comprising: a snowplow blade supported by a support
system; a plow back blade having a support arm rigidly fastened to
a scraper blade; the support arm rotatably connected to the
snowplow blade; wherein the plow back blade is rotatable between a
locked position when the snowplow blade is operated in a reverse
direction and a free position when the snowplow blade is operated
in a forward plowing direction;
2. The device of claim 1 wherein the plow back blade is self
sharpened when in the free position.
3. The device of claim 1 wherein the plow back blade is biased
against the support system in a transport position.
4. The device of claim 1 wherein the scraper blade extends below a
bottom edge of the snowplow blade.
5. The device of claim 1 wherein the scraper blade has a concave
working surface.
6. The device of claim 1 wherein the scraper blade includes a
removeable wear plate.
7. The device of claim 1 also having the scraper blade having a
lower edge with a bevel to remove ice as the snowplow blade travels
in a reverse direction.
8. The device of claim 1 wherein the plow back blade has a
hinge.
9. The device of claim 1 wherein the support arm is an angle
iron.
10. A snow blower comprising: a plow back blade attached to an
auger housing; a plow back blade having a support arm rigidly
fastened to a scraper blade; the support arm rotatably connected to
the auger housing; the plow back blade also attached to a lift
mechanism; wherein the plow back blade is rotatable between a
locked position and a free position using the lift mechanism.
11. A method of plowing snow in a reverse direction comprising:
attaching a plow back blade to a snow plow blade; biasing the plow
back blade against the snow plow blade into a locked position;
plowing material with the plow back blade as the snow plow blade
travels in its reverse direction.
12. The method of claim 11 also having the step of sharpening the
plow back blade as the snow plow blade travels in its forward
direction.
13. The method of claim 11 wherein the plow back blade can be
configured in a "V" configuration.
14. The method of claim 11 wherein the plow back blade can be used
to level soil.
15. The method of claim 11 also having the step of biasing the snow
plow blade into a transport position.
Description
BACKGROUND OF THE INVENTION
[0001] The disclosure relates generally to plows and in particular
the present disclosure relates to plow back blades for snow
removal.
[0002] The seasonal removal of snow from residential and commercial
driveways and parking lots is generally the responsibility of the
property owner. Property owners with relatively small surfaces
often use their own or hire contractors with snow blowers to remove
the snow. Property owners with large paved surfaces often use or
hire snowplows for snow removal. Snowplows and snow blowers are
well known in the prior art. Snow blowers are generally small
self-propelled units that are powered by an engine that also drives
wheels or tracks. However they may also be mounted on a small
vehicle such as a pickup, ATV or tractor in a similar manner as a
snowplow with the auger powered hydraulically or with a separate
engine.
[0003] For large residential and commercial properties, due to the
need for expensive equipment that is used very infrequently,
snowplowing services are often done by specialized commercial
contractors. These contractors may have a significant investment in
equipment that is used intermittently, infrequently and without
much advanced notice during the winter season. Even though winter
snowfall is relatively unpredictable, snow removal contractors only
have a very limited time to remove the snow from all their clients
paved areas.
[0004] After a snowfall, all customers typically want their
property cleaned and cleared as quickly as possible. If a
contractor takes to long, the contractor will lose the customer, as
the customer makes other arrangements for snow removal. Therefore,
there is a relatively small window of time for a contractor keep
his equipment active and producing revenue. As such, there is a
tremendous advantage for efficient snow removal operations.
Improvements in efficiency result in more customers being able to
be handled by a given vehicle for a given snow event, directly
impacting the profitability of the business.
[0005] Snow removal contractors focusing on parking lots, driveways
and the like, often use small vehicles such as four wheel drive
pickup trucks equipped with a front mounted plow blade in their
business. These vehicles are easily driven from site to site and
are very efficient at pushing snow to the perimeter of driveways
and parking lots while the vehicle is moving forward.
[0006] However, in many situations the snow must be pulled away
from obstacles, such as parked or snowed in vehicles, buildings,
garages, retaining walls, parking lot islands, and loading docks.
In these situations, the operator must either leave a strip of
unplowed pavement next to the obstacle or try several one of
several ways to remove the snow all of which are somewhat
inefficient.
[0007] Leaving a strip of unplowed snow around an obstacle is
usually unacceptable to the customer. Doing so typically requires
the contractor make a return trip to the site, which is inefficient
and costly.
[0008] To remove the snow from near an obstacle typically requires
either the operator get out of the vehicle and manually remove the
snow next to the obstacle or the operator try to scrape the snow
back with the plow.
[0009] Manually removing the snow with a shovel or snow blower is
inefficient because it requires the driver to exit the vehicle to
simply move the snow to a position where it can then be accessed
with the snowplow and the snowplow has to again be used to push the
shoveled snow out of the way. This is a relatively inefficient use
of the operator's time since it requires extra time to manually
remove the snow as well as to re-plow the pavement receiving the
manually removed snow.
[0010] Snowplow blades for small vehicles are designed to push snow
while driving forward. The snow accumulates in front of the
snowplow blade until it either spills over the top or spills off to
the side. The front of a typical snowplow is often concave on its
vertical surface. This is done to keep the snow from ramping up the
front of the blade and overtopping the blade before it is directed
off to the side.
[0011] The concave vertical surface on the snowplow blade is also
useful for getting underneath compacted snow and ice to provide a
cleaner payment. This happens because using a concave vertical
surface allows the edge of the snowplow blade to form an oblique
angle of greater than 90 degrees with the pavement approaching the
plow which allows the snowplow blade to get under and loosen the
compacted snow and ice.
[0012] Often hydraulic cylinders are used to pick the blade up as
well as to angle the blade in one direction or the other. In some
embodiments the blade is hinged to allow the blade to be formed
into a "V" shape with the hydraulic cylinders. In some locations,
this is called a Split Gull Wing. This allows the vertex or
centerline of the plow to be either forward or behind the
centerline of the edges of the plow. Having the edges behind the
centerline allow the plow to direct snow to both sides of the
vehicle. Allowing the center of the plow to be behind the edges
will increase the snow carrying capacity of the plow and reduce the
snow directed to the sides of the vehicle while the "V" is
filling.
[0013] Regardless of the embodiments described above, the snowplow
blades and snow blowers are relatively inefficient at removing the
snow by operating the vehicle in reverse and trying to scrape the
snow back with the back surface of the snowplow blade. The concave
vertical surface of the snowplow blade that is needed to clear the
ice and snow from the front of the snowplow translates into a
convex back surface on the snowplow blade. The convex back surface
prevents efficient dragging of the snow away from objects when the
snowplow is operated in reverse. In addition, dragging snow with a
conventional snowplow is generally ineffective at removing any
compacted snow or ice. The convex angle of approach to the snow
when the vehicle is operated in the reverse direction simply allows
the back of a normal blade to ride over the packed snow. Even on
removal of loose snow, the angle of approach leaves a significant
residual behind as the bottom of the snowplow is being dragged over
and compacting the snow. Additionally, any snow that is collected
behind the snowplow quickly ramps over the convex surface of the
back of the snowplow.
[0014] For the reasons stated above, and for other reasons stated
below which will become apparent to those skilled in the art upon
reading and understanding the present specification, there is a
need in the art for alternative snowplow blades particularly with
regard to improving the plowing characteristics of a snow plow in
its reverse direction.
SUMMARY OF THE INVENTION
[0015] This disclosure is directed toward a plow back blade that is
attached to a snowplow blade or a snow blower. The plow back blade
is pivotably connected to the snowplow blade at a pivot point. The
plow back blade is configured to not interfere with snowplow blade
operation when a vehicle is traveling in a forward direction. The
plow back blade is configured to engage material to be plowed when
the plow is plowing in a reverse direction opposite the forward
direction.
[0016] Conceptually a snow blower may be envisioned as a snowplow
blade with additional augers, blowers and shielding to throw the
snow a distance beyond the edge of the snow blower. Thus this
disclosure is relevant to snow removal generally in bi-directional
operation. The invention is highly flexible and independent as to
specific details as to how the snow is removed in the forward
direction. Therefore this disclosure is presented largely using a
snowplow as an example while also being generally relevant to snow
blowers.
[0017] It is an object of this invention to disclose a plow back
blade that will automatically clear snow adjacent to obstructions
without having to disembark a vehicle.
[0018] It is an object of this invention to disclose a plow back
blade that will remove ice and packed snow when the vehicle is
operated in a reverse direction.
[0019] It is an object of this invention to disclose a plow back
blade that will reduce the snow overtopping the snowplow by
operating synergistically with the snowplow blade as the vehicle
operates in the reverse direction.
[0020] It is an object of this invention to disclose a plow back
blade that is self sharpening as the vehicle operates in its
forward direction.
[0021] It is an object of this invention to disclose a plow back
blade will not interfere with the operation of the snowplow as the
vehicle operates in its forward direction.
[0022] It is an object of this invention to disclose a plow back
blade that may include a hardened steel wear plate.
[0023] It is an object of this invention to disclose a plow back
blade that may be readily mounted on a snowplow or snow blower as
an aftermarket accessory.
[0024] It is an object of this invention to disclose a plow back
blade that may be used to level soil.
BRIEF DESCRIPTION OF DRAWINGS
[0025] FIG. 1 illustrates an elevational cross section plow back
blade attached to a snowplow blade on a vehicle plowing in a
forward direction.
[0026] FIG. 2 illustrates an elevational cross section plow back
blade attached to a snowplow blade on a vehicle plowing in a
reverse direction.
[0027] FIG. 3 is a perspective view of an embodiment of the plow
back blade.
[0028] FIG. 4 illustrates a hinged embodiment of a plow back blade,
according to another embodiment of the disclosure.
[0029] FIG. 5 is a side view showing several of the positions into
which the plow back blade may be operated.
[0030] FIG. 6 is an expanded view of a support arm embodiment-using
fastener to hold the plow back blade in a transport position.
[0031] FIG. 7 is a cross-sectional view of a scraper blade having a
wear plate with a sharp edge.
[0032] FIG. 8 is an elevational view of a snow blower with a plow
back blade in locked position.
[0033] FIG. 9 is an elevational view of a snow blower with a plow
back blade in a transport position.
DETAILED DESCRIPTION OF THE INVENTION
[0034] Referring to FIG. 1, a snowplow blade 100 is depicted as
being attached to the front of a vehicle for plowing snow as the
vehicle moves forward. A support system 110 is used to structurally
attach the snowplow blade 100 to the vehicle. The support system
100 is also used to transfer forces from the snowplow blade 100 to
the frame and suspension of the vehicle. A plow back blade 10 is
rotatably attached to the structure of the snowplow blade 110 to
provide snow removal ability as a vehicle moves in a reverse
direction to allow bi-directional snow removal ability.
[0035] The snowplow blade 100 is typically a steel plate having a
front surface 101 and a back surface 102. Typically the snowplow
blade 100 is reinforced with a structural member 105 for example,
an angle iron, channel or rectangular tubing may be added to
minimize bending and deformation of the snowplow blade 100. A
plurality of structural members 105 are typically welded to the
back surface 102 of the snowplow blade 100. The snowplow blade 100
may be flat along its vertical direction, but is typically curved
into a concave vertical surface.
[0036] The limits of the vertical surface are generally defined by
a top edge 103 and a bottom edge 104. The bottom edge 104 is
generally horizontal to substantially engage a paved surface. The
top edge 103 may be generally parallel to the bottom edge 104 or it
may be upwardly sloped from the center of the snowplow blade 100 to
each end. A sloped top edge 103 helps prevent overtopping of the
snow as the snow accumulates and is moved from an interior of the
snowplow blade 100 toward an end.
[0037] A support system 110 is used to transfer the weight and
forces received by the snowplow blade 100 into the suspension
system of the vehicle. The support system 110 may include vertical
support hinge 111 as a point of rotation with a lift mechanism 115
such as a hydraulic cylinder 120 to raise and lower the plow in a
vertical direction. The support system 110 may also include a
horizontal support hinge 112 to provide a rotation point for one or
more hydraulic cylinders 120 to rotate the plow in a horizontal
direction. The snowplow blade 100 may also be hinged to allow the
blade to be changed into various shapes simply by activating the
hydraulic cylinders 120. These shapes may include a straight blade
that is horizontally rotatable to direct snow toward a side of the
vehicle or a "V" shape so that when the vertex of the "V" is in a
forward position, the snow is directed toward both sides of the
vehicle, or when the vertex of the "V" is directed rearward, the
snowplow blade 100 forms a hopper to enhance collection of snow in
front of the front of the snowplow blade 100.
[0038] A plow back blade 10 is mounted to the snowplow blade 100
and is located between the vehicle and at least portions of the
snowplow blade 100. The plow back blade 10 includes a support arm
60 that attaches the snowplow blade 100 to a scraper blade 20
portion of the plow back blade 10. The support arms 60 are
pivotably connected to the snowplow blade 100, preferably at a
structural member 105. Therefore the plow back blade 10 to a large
extent will generally be lifted and/or positioned by the lift
mechanism through the snowplow blade 100.
[0039] The scraper blade 20 may be a heavy flat bar of hardened
steel having a working surface 25 facing the front of the vehicle,
and a support surface 30 facing the snow plow blade 100. The
working surface 25 may be, for example, either flat or concave. In
a concave embodiment, preferably the concave surface would be
facing towards the vehicle. As shown in FIG. 1, as the vehicle
moves forward, the plow back blade 10 has rotated to a free
position 12 so that the scraper blade 20 is being pulled or dragged
along the pavement. This dragging action may provide a
self-sharpening feature to the scraper blade 20.
[0040] With reference to FIG. 2, the snowplow blade 100 is raised
sufficiently so that snow plow blade 100 is above the pavement, and
the plow back blade 10 is allowed to rotate into a substantially
vertical position from the weight of the plow back blade 10. The
snowplow blade 100 is then lowered so that scraper blade 20
contacts the pavement surface. If desired, substantially the entire
weight of the snowplow blade 100 may be supported by the plow back
blade 10. The reverse operation of the vehicle in cooperation with
either the physical friction from the pavement and/or the
accumulating weight of the snow, will rotate the plow back blade 10
toward the snowplow blade 100 until the plow back blade 10
physically contacts the snowplow blade 100 such as at a structural
member 105. The plow back blade is then in its locked position 11
held against the snowplow blade 100 by the reverse movement of the
vehicle and the weight of the accumulating snow against the scraper
blade 20.
[0041] Since the vertical height of the plow back blade 10 is less
than the vertical height of the snow plow blade 100, the snow may
overtop the plow back blade 10. This is usually not an issue of
concern because reverse operation of the vehicle is not generally
necessary to occur over any substantial distance. However, any snow
that overtops the plow back blade 10 is very loose and easily
captured by the back surface 102 of the snow plow blade 100.
[0042] The plow back blade 10 shown in FIG. 3 includes a scraper
blade 20 that may be integral with or attached to support arms 60.
The support arm 60 has a free end and a fixed end. By way of
example, the support arms 60 shown as an angle iron may also be
channel or tube with a circular or rectangular cross section. The
support arm 60 may be straight or arced in either a longitudinal or
lateral direction. The support arm 60 fixed end is attached to the
scraper blade 20 by welding, bolting or other known means. The
support arm 60 free end includes a pivot point 65 for pivotably
connecting the plow back blade 10 to the structural member 105.
Examples of a pivotal connection include a pin, bolt, bearing
assembly or rivet. The support arm 60 is typically pivotably
attached to a structural member 105 on the back surface 102 of the
snowplow blade 100 or directly to the back surface 102, preferably
at approximately the vertical midpoint of the snowplow blade
100.
[0043] The working face 25 of the scraper blade 20, facing the
vehicle, has an upper edge 21 and a lower edge 22. The upper edge
21 position is determined by the geometry of the support system
110. The upper edge 21 position is located so that it contacts the
snowplow blade 100 at its desired locked position and can freely
rotate beyond the free position 12 without interference from the
support system 110.
[0044] The lower edge 22 is positioned so that the lower edge 22 is
at or below the bottom edge 104 of the snowplow blade 100.
Otherwise a gap would exist and the plow back blade 10 would be
unable to contact all the packed snow on the pavement. If the lower
edge 22 is below the bottom edge 104 of the snowplow blade 100, it
is possible to place the entire weight of the snowplow blade 100 on
the plow back blade 10 which assists with removal of ice and packed
snow. Furthermore if the working surface 25 of the plow back blade
is concave this is also useful for getting underneath compacted
snow and ice to provide a cleaner payment. This happens because
using a concave vertical surface allows the working surface 25
forms an oblique angle of greater than 90 degrees with the pavement
approaching the plow back blade 25 which allows getting under and
loosening the compacted snow and ice.
[0045] FIG. 4 illustrates a hinged embodiment of a plow back blade
suitable for use on a hinged plow that is conformable into a "V"
configuration. Alternatively, two independent plow back blades 10
could be installed with the plow back blades 10 meeting in the
horizontal center of the snowplow blade 100. Also shown in FIG. 4
is an embodiment where the scraper blade 20 includes a wear plate
35. This allows for easy replacement and/or hard surfacing of the
lower edge 22 which receives extra wear being in direct contact
with the pavement.
[0046] FIG. 5 is a side view showing the rotation of the plow back
blade 10 about the pivot point 65 to its range of positions. A
substantially horizontal position is utilized as a locked position
11 defined by the plow back blade 10 being held against the
snowplow blade 100 as the vehicle travels in a reverse direction.
The free position 12 allows the plow back blade 10 to loosely drag
and conform to the pavement contours as the vehicle moves in a
forward direction. Additionally a transport position 13 may be
utilized where the plow back blade 10 is rigidly fastened out of
the way when not in use. This position is useful to prevent the
plow back blade from swinging when the vehicle is moving but not
plowing such as when traveling between sites.
[0047] FIG. 6 shows the support arm 60 held in the transport
position 13 using a fastener 45 such as a bolt or pin to prevent
the plow back blade 10 from swinging during vehicle movement.
Alternatively, the plow back blade could be chained, pinned or
otherwise clipped to the snow plow blade 100 or support system
110.
[0048] FIG. 7 shows a cross-sectional view of a scraper blade 20
having a wear plate 35 with a sharp bottom edge. The support
surface 30 faces the snow plow blade 100 and is opposite the
working surface 25 of the scraper blade 20. As the vehicle operates
in its forward direction a bevel is formed between the support
surface 30 and the working surface 25. This bevel is self
sharpening and useful for assisting scraping of ice and snow as the
vehicle moves in a reverse direction.
[0049] As previously described the plow back blade 10 is also
suitable for use on snow blowers 200. Snow blowers 200 may be
vehicle mounted or self propelled. FIG. 8 is an elevational view of
a self propelled snow blower 200 with an auger 210 within an auger
housing 220. The plow back blade 10 is in a locked position 11 and
attached to the auger housing 220. As shown, the lift mechanism 115
would typically be a simple mechanical linkage.
[0050] FIG. 9 is an elevational view of a snow blower 200 with a
plow back blade 10 in a transport position 13.
[0051] With regard to snow blowers 200 and snowplows, a feature of
the invention that allows the lower edge 22 of the plow back blade
10 to be below the bottom edge 104 of the snowplow blade 100. In
this embodiment it is possible to place the entire weight of the
snowplow blade 100 on the plow back blade 10. This feature allows
these machines to be used for leveling materials such as dirt, sand
and gravel. This is possible because the plow back blade 10 can be
easily constructed to handle these materials in a reverse direction
even though it would be cost prohibitive and for impractical to
utilize these devices in a forward direction on these dense
materials. This would allow for example, a snow blower to used in
the summer time for leveling fill on small landscaping or
construction. For example, a snow blower could be used to assist
filling in potholes on a gravel road or path, a use totally
impractical with a conventional snow blower.
[0052] Although specific embodiments of apparatuses and methods
using the apparatus as an example, have been illustrated and
described herein, it will be appreciated by those of ordinary skill
in the art that any arrangement, combination, and/or sequence that
is calculated to achieve the same purpose may be substituted for
the specific embodiments shown. It is to be understood that the
above description is intended to be illustrative and not
restrictive.
[0053] Combinations of the above embodiments and other embodiments
as wells as combinations and sequences of the above methods and
other methods of use will be apparent to individuals possessing
skill in the art upon review of the present disclosure. The scope
of the claimed apparatus and methods should be determined with
reference to the appended claims, along with the full scope of
equivalents to which such claims are entitled.
* * * * *