Patent Abstract:
A snow plow for permanently attaching to a vehicle, selectively deploying a plow blade beyond a bumper and selectively retracting the blade underneath the vehicle by a hydraulic cylinder assembly. The snow plow has a pair of plow blades, namely a front plow blade and a rear plow blade that selectively deploy. The blades have side extensions that hydraulically extend laterally to remove the snow in front of the wheels and widen the path of snow removal. A hydraulic arm assembly pivots the blade to the right or to the left to attack the snow at an angle when plowing and removing snow. A pantographic frame assembly hydraulically lowers and raises the hydraulic cylinder assembly, lowering the plow blade closer to the ground or raising the blade higher for more ground clearance and decreasing the visibility of the blade and the hydraulic cylinder assembly underneath the vehicle.

Full Description:
BACKGROUND OF THE INVENTION 
     The invention relates generally to a snow plow attached to a vehicle chassis. More particularly, the invention relates to a snow plow having a front and rear blade attached and stored underneath a vehicle that selectively deploys when needed to plow and remove snow. 
     Winter snows have always made travel difficult. Before there were motorized vehicles, horse-drawn wooden wedge plows cleared a passage for wagons and carriages to travel. Trains have plows attached to the frame of a front locomotive to remove snow from the tracks. Light rail transit systems have plows attached to the trams or end cars. 
     When roads must be cleared of snow, automobiles generally rely on other larger vehicles to clear the roadways for travel. Trucks, particularly large trucks such as garbage trucks and dump trucks, as well as other construction vehicles such as front loaders are the choice of most local governments. Typically, trucks are deployed with plows attached on an as-needed basis to the front end of the vehicle whenever snow removal is required. Trucks, particularly large trucks such as garbage trucks and dump trucks, as well as other construction vehicles such as front loaders are the choice of most local governments. These vehicles generally have sufficient front end clearance above ground, sufficient power and four-wheel drive trains to push a plow effectively. 
     Many automobile drivers want or need to plow their driveway or private road, particularly those who drive vehicles that have four-wheel or all wheel drive and have powerful engines. One has proposed a heavy cardboard assembly that folds flat or fold into a wedge-shaped blade that sticks onto the front of a vehicle. Drivers of sport utility vehicles (SUV) and light pickup trucks in particular have tried various solutions for attaching a plow to the front of a vehicle. 
     The most common way to attach a plow to a small vehicle is with a hitch and pin system. Many have proposed other attachment devices such as bungie cords, straps, belts and rings. Others focus on ways to adjust height and the angle of attack of the plow blade using hydraulic systems, booms, pulleys and cables. Improvements to the blades have also been suggested such as channels, side panels, angled side panels, ribbed blades, and rubber edges. A rear plow has also been proposed. 
     While these units may be suitable for the particular purpose employed, or for general use, they would not be as suitable for the purposes of the present invention as disclosed hereafter. 
     SUMMARY OF THE INVENTION 
     It is an object of the invention to produce a snow plow that is readily available when needed to plow snow. Accordingly, the invention is a snow plow that is permanently attached underneath a vehicle. 
     It is another object of the invention to produce a snow plow that is permanently attached to a vehicle, but is selectively deployed when needed to plow snow. Accordingly, the invention is a snow plow that selectively deploys beyond a bumper when needed and selectively retracts underneath of the vehicle. 
     It is a further object of the invention to produce a snow plow that plows snow when attached to a vehicle that is moving forward and backward. Accordingly, the invention is a snow plow having a pair of twin blades, one deploying on a vehicle front and one deploying on the vehicle rear. 
     It is yet another object of the invention to produce a snow plow that is attached to a vehicle, the snow plow removing the snow in front of the tires of the vehicle and clear a wide path. Accordingly, the invention is a snow plow with a blade having side extensions, the extensions plowing and removing the snow in front of the vehicle&#39;s tires as well as clearing a path wider than the width of the vehicle. 
     It is yet a further object of the invention to produce a snow plow that pivots the blade to the right or to the left. Accordingly, the snow plow has a hydraulic arm assembly that deploys and pivots the blade to the right or to the left when plowing and removing snow. 
     It is still a further object of the invention to produce a snow plow that stores invisibly underneath a vehicle. Accordingly, the snow plow has a pantographic hydraulic assembly that hydraulically lowers the plow blade closer to the ground and raises the blade higher for more ground clearance, and thereby decreasing the visibility of the blade underneath the vehicle. 
     The snow plow for permanently attaching to a vehicle, selectively deploying a plow blade beyond a bumper and selectively retracting the blade underneath the vehicle by a hydraulic cylinder assembly. The snow plow has a pair of plow blades, namely a front plow blade and a rear plow blade that selectively deploy. The blades have side extensions that hydraulically extend laterally to remove the snow in front of the wheels and widen the path of snow removal. A hydraulic arm assembly pivots the blade to the right or to the left to attack the snow at an angle when plowing and removing snow. A pantographic frame assembly hydraulically lowers and raises the hydraulic cylinder assembly, lowering the plow blade closer to the ground or raising the blade higher for more ground clearance and decreasing the visibility of the blade and the hydraulic cylinder assembly underneath the vehicle. 
     To the accomplishment of the above and related objects the invention may be embodied in the form illustrated in the accompanying drawings. Attention is called to the fact, however, that the drawings are illustrative only. Variations are contemplated as being part of the invention, limited only by the scope of the claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In the drawings, like elements are depicted by like reference numerals. The drawings are briefly described as follows. 
         FIG. 1  is a diagrammatic perspective view of the invention attached to a sport utility vehicle (SUV), shown in outline, with a front blade deployed and a rear blade in a retracted position. 
         FIG. 2A  is a side elevational view of the front blade deployed below a vehicle, shown in outline, by a hydraulic system. 
         FIG. 2B , similar to  FIG. 2A , is a side elevational view of the front blade retracted underneath the vehicle by the hydraulic system. 
         FIG. 3A  is a front elevational view of the front blade deployed on the vehicle, with the vehicle in outline. 
         FIG. 3B , similar to  FIG. 3A , is a front elevational view of the front blade deployed on the vehicle, shown in outline, with the blade expanded with a pair of extensions. 
         FIG. 4A  is a diagrammatic perspective view of the plow blade, extensions and a hydraulic cylinder assembly in a retracted position. 
         FIG. 4B , similar to  FIG. 4A , is a diagrammatic perspective view of the blade and the hydraulic cylinder assembly in a deployed position and the extensions and extension hydraulic cylinders in a retracted position. 
         FIG. 4C , similar to  FIG. 4A  and  FIG. 4B , is a diagrammatic perspective view of the plow blade and the hydraulic cylinder assembly in a deployed position and the extensions and extension hydraulic cylinders telescopically expanded in the deployed position. 
         FIG. 5A  is a front elevational view of the front plow blade deployed on the vehicle, shown in outline. 
         FIG. 5B , similar to  FIG. 5A , is a front elevational view of the front blade deployed on the vehicle, with the vehicle in outline, with the plow blade expanded with a plurality of telescoping extensions. 
         FIG. 6  is a diagrammatic perspective view of the blade with a pair of universal joints for pivoting, the extensions and hydraulic cylinder assembly in a retracted position. 
         FIG. 7  is a diagrammatic perspective view of the deployed plow blade and a plurality of telescopic extensions. 
         FIG. 8A  is a side elevational view of the plow blade with a pantographic frame assembly in the deployed position, with the vehicle in outline. 
         FIG. 8B , similar to  FIG. 8A , is a side elevational view of the plow blade with the pantographic frame assembly in the retracted position with the vehicle in outline. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       FIG. 1  illustrates a snow plow  10  having a front plow blade  20 F and a rear plow blade  20 R mounted on a frame assembly  30  underneath a vehicle  100  that selectively deploys to plow snow and selectively retracts when not in use. The plow blades are deployed and retracted by a mechanism that has a plurality of hydraulic cylinders  40 H,  40 S in a hydraulic cylinder assembly. The vehicle  100  has an underside, a front  100 F having a pair of front wheels  102 F and a front bumper  104 F, and a rear  100 R having a pair of rear wheels  102 R and a rear bumper  104 R. The plow blades  20 F,  20 R are disposed underneath the vehicle  100  when retracted in an essentially horizontal position. When deployed, the blades  20 F,  20 R advance towards the bumper  104 F,  104 R, passing beyond the bumper and tilting to an essentially vertical position, the blade positioned by the hydraulic cylinders  40 H,  40 S. The blades  20 F,  20 R, each having a pair of side edges  20 E, have a plurality of extension panels  50  telescoping out from each side edge  20 E, expanding the blades  20 F,  20 R, having a concave plowing surface  20 S, the plowing surface increasing to remove snow in front of the wheels  102 F,  102 R to create a track wider than the vehicle. 
       FIG. 3A  shows the blade  20  deploying beyond the bumper in front of the pair of wheels  102 , the pair of wheels  102  separated by a width. Initially the blade  20  is stored in the horizontal position under the vehicle  100 . The blade  20 , having a width, is pushed by hydraulic cylinders, passing beyond the bumper  104 . Once the blade  20  advances beyond the bumper  104 , the blade  20  pivots into a vertical position as shown in  FIG. 3A . The width of the blade  20  with the extension panels  50  retracted is smaller than the length of the axle. The blade  20  advances beyond the bumper  104  of the vehicle  100  and pivots into the vertical position.  FIG. 3B  shows the blade  20 , the blade deployed in the vertical position with the pair of side extension panel  50  expanded, one side extension  50  on each side of the blade  20 , the side extensions increasing the plowing surface  20 S so that a track wider than the width between the wheels is cleared by the plow. 
       FIG. 5A  similarly shows a further example using a compact blade  20 C, the compact blade  20 C having an appreciably lesser width than the width between the wheels. The compact blade  20 C has two pairs of side extension panels  50 ,  52 . As demonstrated in  FIG. 5B , when the blade  20 C is deployed in the vertical position, the side extension panels  50 ,  52  telescopically expand, one pair on each side of the blade  20 , the side extension panels  50 ,  52  increasing the plowing surface  20 S so that a wider track wider is cleared by the plow. 
       FIG. 2A  shows the plow blade  20  in the vertical position, proximate to and beyond the bumper  104 . The snow plow  10  has two blades  20 , one in the front of the vehicle  100 , one in the rear, each deploying and retracting in the same manner. For this discussion,  FIG. 2A  and  FIG. 2B  illustrate the vehicle front  10 F, but it is understood that the rear blade operates analogously. The vehicle  100  depicted in the drawings is a typical sports utility vehicle (SUV), but the invention is not limited to installation on SUVs, and the snow plow is installable on other vehicles, such as, for example, vans, light pickup trucks, some sedans and other vehicles having sufficient ground clearance, all-wheel or four-wheel drive trains and an engine having sufficient power to push the snow plow through obstructions such as snow. 
     In  FIG. 2A , the snow plow blade is attached by a pair of hydraulic cylinders  40 H,  40 S, a horizontal hydraulic cylinder  40 H and a slanting hydraulic cylinder  40 S, to the frame assembly  30  underneath the vehicle  100 , the hydraulic cylinders each having a rod  42 , a piston  44 , and a pair of ends, a cap end  44 E and a rod end  42 E with a clevis  46 . Hydraulic cylinders, how they are constructed, and how they function are well know to those of ordinary skill and are beyond the scope of this discussion. It is also understood the pneumatic cylinders can be constructed and modified to perform the same function as the hydraulic cylinders and are included within the inventive concept. 
     The frame assembly  30  has a center beam  32 , parallel to the ground and at least one cross-strut  34  orthogonal to the center beam and parallel to the ground, the cross-strut  34  and center beam  32  attached underneath the vehicle  100 . The beam has a pair of ends  32 E, a first end at the front  100 F of the vehicle and a second end at the rear. Attached to the end of the beam is a fixed joint  38 , the joint connecting to the cap end  44 E of the horizontal hydraulic cylinder  40 H to the blade  20 . The horizontal hydraulic cylinder  40 H extends the plow horizontally, advancing from underneath the vehicle beyond the bumper and retracts the plow blade by retracting the plow blade back underneath the vehicle when the plow blade is in a horizontal position. The beam  32 , having a bottom  32 B, has a pivot joint  28  attached to the bottom  32 B of the beam, connecting to the cap end  44 E of the slanting hydraulic cylinder  40 S. The slanting hydraulic cylinder  40 S tilts the plow blade into a vertical position after the plow blade advances past the bumper when extending the plow blade and tilts the plow blade into a horizontal position prior to retracting the plow blade back under the vehicle The pivot joint  38  is set back a distance from the end  32 E of the beam  32 , the distance sufficient for the slanting hydraulic cylinder  40 H to assume a horizontal position. 
     The blade  20 , having a back, a center vertical axis, a top edge  20 T and a bottom edge  20 B, has a pair of short posts  26  disposed on the back along the center vertical axis, an upper post  26 U adjacent to the top edge  20 T and a shorter lower post  26 L adjacent to the bottom edge  20 B. The upper post  26 U has a pivot joint  38  attached to the rod end  42 E of the horizontal hydraulic cylinder  40 H, the pivot joint  38  allowing the post  26 U to partially rotate along a fixed vertical axis of rotation. The lower post  26 L has a pivot joint  38  attached to the clevis  46  on the rod end  42 E of the slanting hydraulic cylinder  40 S. 
       FIG. 2A  shows the plow blade  20  deployed, the hydraulic cylinders  40 H,  40 S fully extended, locking the blade  20  in a vertical position. When the blade  20  retracts, as shown in  FIG. 2B , the horizontal cylinder  40 H pulls the blade  20  away from front  100 F of the vehicle. As the horizontal cylinder  40 H retracts, the upper post  26 U pivots in the clevis  46  so that as the slanting cylinder  40 S retracts, the blade  20  moves into a horizontal position. When the plow blade  20  is fully retracted, the blade is horizontal and underneath the vehicle  100 . In the drawing, the retracted blade  20  is shown slightly in front of the wheel  102 , however, the blade  20  can be stored further aft of the wheels  102 , the position depending on the relative length of the center beam  32  and the hydraulic cylinders  40 H,  40 S, a shorter center beam  32  and longer hydraulic cylinders  40 H,  40 S positioning the blade  20  further aft of the front  100 F of the vehicle. 
       FIG. 4A  shows in detail a pair of extension hydraulic cylinders  40 E, each having a rod  42 , a piston  44 , a cap end  44 E and a rod end  42 E with a clevis  46 , on the back  20 R of the blade  20 . The extension hydraulic cylinders  40 E telescopically extending the extension panels  50  out from the sides  20 E of the plow blade  20  when the plow blade  20  is in a vertical position and retracting the extension panels  50  into the sides  20 E of the plow blade  20  prior to retracting the plow blade  20  back under the vehicle. The extension hydraulic cylinders  40 E are attached to the back  20 R of the blade  20  toward the vertical center axis. In the drawing, the cap end  44 E on the cylinder  40 E is attached to the extension panel  50  and the clevis  46  on the rod end  42 E is attached towards the center. It is understood by those of ordinary skill that reversing the orientation of the cylinder is not significant and that the invention functions the same whether the rod end  42 E is attached on the back  20 R center or on the extension  50 .  FIG. 4A  shows the plow blade  20  in the horizontal position with the extension panels  50  contracted as the horizontal hydraulic cylinder  40 H moves the blade  20  forward.  FIG. 4B  shows the blade  20  moving into the vertical position, with the slanting hydraulic cylinder  40 S pushing the bottom of the blade  20 B forward as the pivot joint  38  connecting the horizontal cylinder  40 H rotates the blade  20 .  FIG. 4C  shows the extension hydraulic cylinders  40 E expanding the blade  20  by pushing the extension panels  50  out the sides  20 E of the blade  20 . At the top  20 T and bottom edges  20 B of the blade  20  are a pair of tracks  22 . The panels  50  move within the tracks  22  as the cylinders  40 E move the extension panels  50  outward, maintaining the extensions in alignment with blade  20 . 
       FIG. 6  shows a further embodiment of the snow plow  10  employing a blade  20 H. The taller blade  20 H is more advantageous for plowing greater snow depths, providing the vehicle has a sufficiently powerful engine to drive the larger blade  20 H. In this example, the clevis  46  on the horizontal hydraulic cylinder  40 H and the clevis  46  on the slanting hydraulic cylinder  40 S are connected to universal joints  48  on the vertical center axis. The joint  48  connecting the horizontal hydraulic cylinder  40 H is midway between the top edge  20 T and the bottom edge  20 B of the blade  20 , the blade  20 H have a center horizontal axis, the joint  48  disposed along the center horizontal axis. In this embodiment, the universal joints  48  rotate the plow blade  20  to the right or to the left when the blade is in the vertical position so that the blade  20 H attacks the snow at an angle, pushing the snow to the side rather than forward. The extension hydraulic cylinders  40 E are attached to the back  20 R of the blade  20  equidistantly from the center vertical axis along the center horizontal axis. 
       FIG. 7  demonstrates another embodiment of the snow plow  10  with an articulated assembly  26  of hydraulic cylinders. The blade  20  has the pair of extension panels  50 ,  52  on each side  20 E that telescopically expand to increase the surface of the blade  20 . The rod end  42 E of the horizontal hydraulic cylinder  40 H and the rod end  42 E of the slanting hydraulic cylinder  40 S are connected to the back of blade  20 R by the universal joints  48  described hereinabove. Each side  20 E of the blade has a pair of extensions, the outer extension panel  50  and the inner extension panel  52 . The panels  50 ,  52  telescope out, the outer panel  50  moving out from the inner panel  52 . The rod end  42 E of the extension hydraulic cylinders  40 E are connected by a pivot joint  48  on the outer panel  50 . Attached to the end of the beam, which is not shown, is a tee bracket  60 . The tee bracket has a short cross piece  62  and a long stem  64 . Attached to the long stem  64  is the cap end  44 E of the horizontal hydraulic cylinder  40 H, and attached to the cross piece  62  is the cap end  44 E of the slanting hydraulic cylinder  40 S and a pair of hydraulic cylinder arms  40 A, each having a cap end  44 E attached to the bracket  60 . The pair of cylinder arms  40 A extend to the outer extension panels  50 , one arm  40 A to each panel  50 , connecting at a pivot joint  48  on the outer panel  50  where the extension hydraulic cylinders  40 E connect to the outer panel  50 . The tracks  22  at the top edge  20 T and bottom edges  20 B have a pair of telescoping tracks  24  that fit inside the tracks  22  and deploy with the panels  50 ,  52 , expanding each track  22  to accommodate the extension panels. The extension panels  50 ,  52  move within the tracks  22  as the cylinders  40 E move the extensions outward, keeping the extension panels  50 ,  52  aligned with blade  20 . The cylinder arms  40 A rotate the plow blade  20  to the right or to the left by selectively expanding and contracting in opposing motions, so that the blade  20  attacks the snow at an angle, pushing the snow to the side rather than forward. When the rod on one arm  40 A contracts, the blade  20  slants in the direction of the contracting arm. The universal joints  48  on the horizontal hydraulic cylinder  40 H and slanting hydraulic cylinder  40 S rotate the blade  20  in conjunction with the hydraulic cylinder arms  40 A. The hydraulic arms  40 A rotate the plow blade  20  in the right or left direction, by a first hydraulic arm retracting in the direction of rotation and a second hydraulic arm extending in the opposing direction, stably positioning the blade at an angle to attack the snow. 
       FIG. 8A  and  FIG. 8B  illustrate yet a further embodiment of the snow plow  10  with a pantographic frame portion  90  that retracts the snow plow blade  20  and hydraulic cylinders  40 H,  40 S higher and further aft of the front  100 F of the vehicle, the blade  20  invisible behind the bumper  104 F. Referring to  FIG. 8A , the pantographic frame portion  90  has a rack  92 , a pantographic hydraulic cylinder  40 P, and a pair of pivoting supports  94  attached to the beam  32 , connecting the beam  32  to the rack  92 . Each support  94  has a pair of ends, a top end  94 T and a bottom end  94 B, the top ends  94 T connecting to the beam  32  by pivot joints  38  and the bottom ends  92 B connecting to the rack  92  by pivot joints  38 , the pivot joints  38  allowing the supports  94  to swivel within a limited range of rotation. The rack  92  has a top  92 T, a bottom  92 B and a pair of ends, a fore end  92 F and an aft end  92 R. Connecting to the rack  92  at the fore end  92 F is the horizontal hydraulic cylinder  40 H. The slanting hydraulic cylinder  40 S connects to the bottom  92 B of the rack  92 , off set towards the aft end  92 R at a distance from the fore end  92 F of the rack  92  at the distance sufficient for the slanting hydraulic cylinder  40 S to assume a horizontal position under the rack  92 . The slanting hydraulic cylinder  40 S and horizontal hydraulic cylinder  40 H connects to the blade as described hereinabove. 
     Attached to the aft end  92 R of the rack  92  is the pantograph hydraulic cylinder  40 P, having a rod end  42 E and a cap end  44 E, the rod end  42 E connecting to the aft end  44 E with a pivot joint  38 . The cap end  44 E connects to the beam  32  by a pivot joint  38 , the pivot joint  38  further aft than the supports  94 , at a distance sufficient for the pantograph hydraulic cylinder  40 P to assume a horizontal position under the beam  32  when the snow plow blade  20  is retracted as illustrated in  FIG. 8B . 
     Referring to  FIG. 8A , when the blade  20  is deployed, the pantograph hydraulic cylinder  40 P pushes the rack  92  to the front  100 F of the vehicle. When the rack  92  moves forward, the supports  94  pivot into a vertical position, lowering the rack  92  sufficiently, so that the rack  92  and the attached horizontal hydraulic cylinder  40 H move under the bumper  104 F. The horizontal hydraulic cylinder  40 H and the slanting hydraulic cylinder  40 E move the plow blade  20  forward to the front  100 F of the vehicle and into the vertical position as described hereinabove. Referring to  FIG. 8B , when the plow blade  20  is retracted, the pantograph hydraulic cylinder contracts  40 P and pulls the rack  92  upward toward the beam  32  until the pantograph hydraulic cylinder  40 P is almost horizontal with the beam  32 , the supports  94  pivoting into a horizontal position under the beam  32 , pulling the rack  92  up and under the supports  94 . The pantographic frame portion  90  fits compactly under the beam  32 , invisible from outside the vehicle  100 . The horizontal hydraulic cylinder  40 H and the slanting hydraulic cylinder  40 S retract the blade  20  into the horizontal position as described hereinabove. 
       FIG. 8A  and  FIG. 8B  illustrate the pantographic frame assembly  90  with the blade  20  having one pair of extensions  50 , one on each side of the blade  20 , the extensions without the hydraulic arm for the sake of simplicity and clarity. It is understood by one of ordinary skill that the pantographic frame assembly is useful with other embodiments such as the blade having telescoping panel extensions and hydraulic arms. 
     Referring to  FIG. 1 , to use the snow plow  10 , a driver selectively deploys the plow blade  20  when the vehicle is about to move forward, the front plow blade  20 F in this illustration, by initiating the horizontal hydraulic cylinder  40 H and the slanting hydraulic cylinder  40 S to extend, the hydraulic cylinders  40 H,  40 S advancing the blade  20  towards the bumper  104 , passing beyond the bumper  104  and tilting the blade  20  to an essentially vertical position. The driver initiates the extension hydraulic cylinders to expand the extensions  50  on the blade  20 . When the driver chooses to stop plowing, the driver selectively retracts the plow blade  20  by contracting the extension hydraulic cylinders, pulling the extensions  50  toward the center of the blade  20 , further contracting the horizontal hydraulic cylinder  40 H and the slanting hydraulic cylinder  40 S, the slanting hydraulic cylinder  40 S swiveling the blade  20  into the horizontal position, the hydraulic cylinders  40 H,  40 S retracting the blade  20  away from the bumper  104 F, passing under the bumper  104 F into the position underneath the vehicle  100 . When the driver chooses to move backward in the reverse direction, the driver selectively retracts the first plow blade, the front plow blade  20 F as illustrated, as described hereinabove and selectively deploys the rear plow blade  20 R before the vehicle is about to move backward as described hereinabove. When the vehicle is about to move forward again, the driver selectively retracts the rear plow blade as described hereinabove. 
     Referring to  FIG. 7 , to use the snow plow having the articulated assembly  26  of hydraulic cylinders, a driver selectively engages the plow blade  30  by initiating the horizontal hydraulic cylinder  40 H and the slanting hydraulic cylinder  40 S as described hereinabove. The driver initiates the extension hydraulic cylinders  40 E and the hydraulic arms  40 A to expand the extension panels  50 ,  52  on the blade  20 . The driver selectively swivels the blade  20  to the right or the left to attack the snow at an angle, by retracting the hydraulic arm  40 A of the desired direction, pulling the extension  50  toward the vehicle allowing the hydraulic arm  20 A on the opposing side to expand, forcing the opposing extension  50  in the opposite direction, swiveling the blade  20  toward the retracted arm  40 A. When the driver chooses to stop plowing, the driver selectively retracts the plow blade  20  by contracting the extension hydraulic cylinders  20 E and the hydraulic arms  20 A, pulling the extension panels  50 ,  52  toward the center of the blade  20 , further contracting the horizontal hydraulic cylinder  40 H and the slanting hydraulic cylinder  40 S, the slanting hydraulic cylinder  40 S swiveling the blade  20  into the horizontal position, the hydraulic cylinders  40 H,  40 S retracting the blade  20 F away from the bumper, passing under the bumper  104 F and moving further underneath the vehicle  100 . When the driver choose to reverse direction, the driver selectively retracts the first plow blade, the front plow blade  20 F as illustrated, as described hereinabove and selectively deploys the second rear plow blade as described hereinabove. 
     Referring to  FIG. 8A , to use the snow plow having the pantographic frame assembly  90 , a driver selectively engages the plow blade  30  by initiating the pantograph hydraulic cylinder  40 P to lower the rack  92  below the level of the bumper  104 F by swiveling the supports  94  into the vertical position, moving the rack  92  down and forward. The driver further initiates the horizontal hydraulic cylinder  40 H and the slanting hydraulic cylinder  40 S as described hereinabove. The driver initiates the extension hydraulic cylinders  40 E to expand the extensions  50  on the blade  20 . When the driver chooses to stop plowing, the driver selectively retracts the plow blade  20  by contracting the extension hydraulic cylinders  20 E, pulling the extensions  50  toward the center of the blade  20 F, further contracting the horizontal hydraulic cylinder  40 H and the slanting hydraulic cylinder  40 S, the slanting hydraulic cylinder  40 S swiveling the blade  20  into the horizontal position, the hydraulic cylinders  40 H,  40 S retracting the blade  20 F away from the bumper, passing under the bumper  104 F, the pantograph hydraulic cylinder  40 P retracting the rack  92  backwards pulling the blade  20  further underneath the vehicle  100 . When the driver choose to reverse direction, the driver selectively retracts the first plow blade, the front plow blade  20 F as illustrated, as described hereinabove and selectively deploys the second rear plow blade as described hereinabove. 
     In conclusion, herein is presented a snow plow having a front and rear blade attached and stored underneath a vehicle that selectively deploys when needed to plow and remove snow. The invention is illustrated by example in the drawing figures, and throughout the written description. It should be understood that numerous variations are possible, while adhering to the inventive concept. Such variations are contemplated as being a part of the present invention.

Technology Classification (CPC): 4