Patent Publication Number: US-7591087-B2

Title: Flow divider for snowplow wings

Description:
This application claims priority to U.S. Ser. No. 60/826,449, titled FLOW DIVIDER FOR SNOWPLOW WINGS, filed Sep. 21, 2006, which is incorporated herein by reference. 

   I. BACKGROUND OF THE INVENTION 
   A. Field of Invention 
   This invention pertains to the art of methods and apparatuses for snowplows and more specifically to a hydraulic system that can move two snowplow wings at substantially the same time and substantially the same speed regardless of the disparity of loads on the wings. 
   B. Description of the Related Art 
   It is well known in the art to provide snowplow assemblies for use in moving snow from roads, driveways, parking lots and other such surfaces. Typically, the snowplow assembly is attached to a vehicle, such as a pickup truck. Usually, the snowplow assembly can be moved by the driver/operator of the vehicle. Thus, for example, the operator can adjust a controller from inside the occupant compartment of the vehicle to raise, lower and pivot the snowplow assembly. 
   In recent years, the snowplow industry has provided additional snowplow assembly designs and movement options. A relatively new snowplow assembly, for example, is termed a V-plow. A V-plow is essentially two snowplow blades combined onto a single frame. In this case, each snowplow blade is generally considered a wing and typically, each wing can be controlled independently of the other wing. Another known type of snowplow assembly includes a snowplow blade that has a non-pivotal middle portion and two wings. Each pivotal wing is placed on one end of the snowplow&#39;s middle portion. As with the V-plow, it is common that each pivotal wing can be controlled independent of the opposite wing. 
   It is known to move a snowplow assembly using a hydraulic system. As a result, hydraulic components such as hydraulic cylinders, hydraulic piping and hoses, appropriate fittings and the like are required to operate the snowplow assembly. The hydraulic system also generally includes a control mechanism. Typically, the operator manipulates a handle, switches, or buttons on the controller that causes the controller to transmit a corresponding signal to the control mechanism. The control mechanism receives the signal from the controller and then controls the components of the hydraulic system so that the flow of hydraulic fluid is directed appropriately to cause the proper movement of the snowplow assembly. Such control mechanisms are known to include a base plate, a hydraulic reservoir or tank, a hydraulic pump unit, and the necessary control valves such as solenoid valves and/or cartridge valves. 
   Although known snowplow assemblies having at least two wings work well for their intended purpose, they have several disadvantages. Often, the load acting on one wing of a snowplow assembly may be substantially different from the load acting on the other wing. Referring now to  FIG. 1 , this disparity in loads acting on each wing may occur, for one non-limiting example, when the operator is plowing snow to the side of the road (with the first wing  34  in a position relatively perpendicular to the road&#39;s longitudinal axis and the second wing  36  pivoted in direction D toward the vehicle) and desires to adjust the wings into what is known as scoop mode. Scoop mode is the condition where both wings are pivoted fully forward. More specifically, scoop mode is accomplished when the first wing  34  is pivoted fully in direction A and the second wing  36  is pivoted fully in direction C. Typically, the load (created by the amount of snow or ice in front of the wings) is not the same for both wings. As a result, with all known snowplow assemblies such an adjustment into scoop mode means that the wing with the lesser load will move first and the wing with the greater load will move only after a delay. More specifically, with all known snowplow assemblies adjustment into scoop mode means that the first hydraulic cylinder pivoting the lesser loaded wing will begin moving quickly but the second hydraulic cylinder pivoting the greater loaded wing will only begin moving when the hydraulic pressure in the hydraulic piping to the first cylinder equals the hydraulic pressure in the hydraulic piping to the second cylinder. Such delayed and uneven movement of the wings is undesirable as it waists time and may cause some snow to be left behind (not plowed). 
   The present invention minimizes this difficulty by providing a flow divider that enables two or more snowplow wings to move at substantially the same time and substantially the same speed regardless of the disparity of loads acting on the wings. 
   II. SUMMARY OF THE INVENTION 
   According to one embodiment of this invention, a snowplow assembly may have a snowplow mechanism, a hydraulic system, and a control system. The snowplow mechanism may have a frame and a first wing and a second wing that are adapted to move independently with respect to the frame. The hydraulic system may have a first cylinder for use in moving the first wing, a second cylinder for use in moving the second wing, a pump system for use in providing hydraulic fluid to the first and second cylinders, and a flow divider that causes the first wing and the second wing to move at substantially the same time and substantially the same speed regardless of the disparity of loads on the first wing and the second wing. 
   According to another embodiment of this invention, a snowplow assembly may have a snowplow mechanism, a hydraulic system, and a control system. The snowplow mechanism may have a frame and a first wing and a second wing that are adapted to move independently with respect to the frame. The hydraulic system may have a first cylinder for use in moving the first wing, a second cylinder for use in moving the second wing, a pump system for use in providing hydraulic fluid to the first and second cylinders, and a flow divider that causes the first wing and the second wing to move at substantially the same time and substantially the same speed regardless of the disparity of loads on the first wing and the second wing. The flow divider may receive hydraulic fluid from the pump system and may provide a first hydraulic stream having a first flow rate to the first cylinder and a second hydraulic stream having a second flow rate to the second cylinder. The first flow rate may be substantially the same as the second flow rate. 
   According to another embodiment of this invention, a snowplow assembly may have a snowplow mechanism, a hydraulic system, and a control system. The snowplow mechanism may have a frame and a first wing and a second wing that are adapted to pivot independently with respect to the frame. The hydraulic system may have a first cylinder for use in moving the first wing, a second cylinder for use in moving the second wing, a pump system for use in providing hydraulic fluid to the first and second cylinders, and a flow divider that causes the first wing and the second wing to move at substantially the same time and substantially the same speed regardless of the disparity of loads on the first wing and the second wing. 
   According to one embodiment of this invention, a snowplow assembly may have a snowplow mechanism, a hydraulic system, and a control system. The snowplow mechanism may have a frame and a first wing and a second wing that are adapted to move independently with respect to the frame. The hydraulic system may have a first cylinder for use in moving the first wing, a second cylinder for use in moving the second wing, a pump system for use in providing hydraulic fluid to the first and second cylinders, and a restrictive flow divider that causes the first wing and the second wing to move at substantially the same time and substantially the same speed regardless of the disparity of loads on the first wing and the second wing. 
   According to one embodiment of this invention, a snowplow assembly may have a snowplow mechanism, a hydraulic system, and a control system. The snowplow mechanism may have a frame and a first wing and a second wing that are adapted to move independently with respect to the frame. The hydraulic system may have a first cylinder for use in moving the first wing, a second cylinder for use in moving the second wing, a pump system for use in providing hydraulic fluid to the first and second cylinders, and a rotary flow divider that causes the first wing and the second wing to move at substantially the same time and substantially the same speed regardless of the disparity of loads on the first wing and the second wing. 
   According to another embodiment of this invention, a snowplow assembly may have a snowplow mechanism, a hydraulic system, and a control system. The snowplow mechanism may have a frame and a first wing and a second wing that are adapted to move independently with respect to the frame. The hydraulic system may have a first cylinder for use in moving the first wing, a second cylinder for use in moving the second wing, a pump system for use in providing hydraulic fluid to the first and second cylinders, and a flow divider that causes the first wing and the second wing to move at substantially the same time and substantially the same speed regardless of the disparity of loads on the first wing and the second wing. The control system may comprise a control device and a control device position for moving the first wing and the second wing to move at substantially the same time and substantially the same speed. 
   According to another embodiment of this invention, a snowplow assembly may have a snowplow mechanism, a hydraulic system, and a control system. The snowplow mechanism may have a frame and a first wing and a second wing that are adapted to move independently with respect to the frame. The hydraulic system may have a first cylinder for use in moving the first wing, a second cylinder for use in moving the second wing, a pump system for use in providing hydraulic fluid to the first and second cylinders, and a flow divider that causes the first wing and the second wing to move at substantially the same time and substantially the same speed regardless of the disparity of loads on the first wing and the second wing. The control system may comprise a lever and a control device position for moving the first wing and the second wing to move at substantially the same time and substantially the same speed. 
   According to another embodiment of this invention, a snowplow assembly may have a snowplow mechanism, a hydraulic system, and a control system. The snowplow mechanism may have a frame and a first wing and a second wing that are adapted to move independently with respect to the frame. The hydraulic system may have a first cylinder for use in moving the first wing, a second cylinder for use in moving the second wing, a pump system for use in providing hydraulic fluid to the first and second cylinders, and a flow divider that causes the first wing and the second wing to move at substantially the same time and substantially the same speed regardless of the disparity of loads on the first wing and the second wing. The control system may comprise a switch and a control device position for moving the first wing and the second wing to move at substantially the same time and substantially the same speed. 
   According to another embodiment of this invention, a snowplow assembly may have a snowplow mechanism, a hydraulic system, and a control system. The snowplow mechanism may have a frame and a first wing and a second wing that are adapted to move independently with respect to the frame. The hydraulic system may have a first cylinder for use in moving the first wing, a second cylinder for use in moving the second wing, a pump system for use in providing hydraulic fluid to the first and second cylinders, and a flow divider that causes the first wing and the second wing to move at substantially the same time and substantially the same speed regardless of the disparity of loads on the first wing and the second wing. The control system may comprise a plurality of control devices and a plurality of control device positions for moving the first wing and the second wing to move at substantially the same time and substantially the same speed. 
   According to one embodiment of this invention, a method may include the steps of: providing a snowplow mechanism having a frame, a first wing, and a second wing, wherein the first wing and the second wing are adapted to move independently with respect to the frame; providing a hydraulic system having a first cylinder for use in moving the first wing, a second cylinder for use in moving the second wing, a pump system for use in providing hydraulic fluid to the first and second cylinders, and a flow divider; applying a first load to the first wing; applying a second load, that is greater than the first load, to the second wing; and, moving the first wing and the second wing at substantially the same time and substantially the same speed. 
   According to another embodiment of this invention, a method may include the steps of: providing a snowplow mechanism having a frame, a first wing, and a second wing, wherein the first wing and the second wing are adapted to move independently with respect to the frame; providing a hydraulic system having a first cylinder for use in moving the first wing, a second cylinder for use in moving the second wing, a pump system for use in providing hydraulic fluid to the first and second cylinders, and a flow divider; applying a first load to the first wing; applying a second load, that is greater than the first load, to the second wing; and, pivoting the first wing and the second wing at substantially the same time and substantially the same speed. 
   According to another embodiment of this invention, a method may include the steps of: providing a snowplow mechanism having a frame, a first wing, and a second wing, wherein the first wing and the second wing are adapted to move independently with respect to the frame; providing a hydraulic system having a first cylinder for use in moving the first wing, a second cylinder for use in moving the second wing, a pump system for use in providing hydraulic fluid to the first and second cylinders, and a flow divider; applying a first load to the first wing; applying a second load, that is greater than the first load, to the second wing; and, moving the first wing and the second wing at substantially the same time and substantially the same speed. The first wing and the second wing may be moved at substantially the same time and substantially the same speed by communicating hydraulic fluid from the pump system to the fluid divider; communicating a first hydraulic stream having a first flow rate from the fluid divider to the first cylinder; and, communicating a second hydraulic stream having a second flow rate from the fluid divider to the second cylinder. The first flow rate may be substantially the same as the second flow rate. 
   According to another embodiment of this invention, a method may include the steps of: providing a snowplow mechanism having a frame, a first wing, and a second wing, wherein the first wing and the second wing are adapted to move independently with respect to the frame; providing a hydraulic system having a first cylinder for use in moving fie first wing, a second cylinder for use in moving the second wing, a pump system for use in providing hydraulic fluid to the first and second cylinders, and a flow divider; applying a first load to the first wing; applying a second load, that is greater than the first load, to the second wing; and, moving the first wing and the second wing at substantially the same time and substantially the same speed. The first wing and the second wing may be moved at substantially the same time and substantially the same speed by providing a control system that may have a control device; positioning the control device into a control device position for moving the first wing and the second wing at substantially the same time and substantially the same speed; communicating hydraulic fluid from the pump system to the fluid divider; communicating a first hydraulic stream having a first flow rate from the fluid divider to the first cylinder; and, communicating a second hydraulic stream having a second flow rate from the fluid divider to the second cylinder. The first flow rate may be substantially the same as the second flow rate. 
   One advantage of this invention is that known delayed and uneven movement of snowplow wings when under differing loads is eliminated 
   Another advantage of this invention is that known hydraulic systems utilized in snowplow mechanisms having at least two wings can be easily modified to accommodate the flow divider. 
   Still other benefits and advantages of the invention will become apparent to those skilled in the art to which it pertains upon a reading and understanding of the following detailed specification. 

   
     III. BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention may take physical form in certain parts and arrangement of parts, embodiments of which will be described in detail in this specification and illustrated in the accompanying drawings which form a part hereof and wherein: 
       FIG. 1  is a perspective front view of a vehicle equipped with a snowplow assembly according to this invention. 
       FIG. 2  is a perspective back view of the snowplow assembly of  FIG. 1  shown detached from the vehicle. 
       FIG. 3  is a perspective front view of a snowplow assembly hydraulic unit according to one embodiment of this invention. 
       FIG. 4  is a schematic view of a snowplow assembly hydraulic system according to one embodiment of this invention. 
       FIG. 5  is a schematic view of a snowplow assembly control and wiring system according to one embodiment of this invention. 
       FIG. 6  is a schematic view of a snowplow assembly control and wiring system according to another embodiment of this invention. 
       FIG. 7  is a partial schematic view of a snowplow assembly control showing various lever positions according to one embodiment of the invention. 
   

   IV. DETAILED DESCRIPTION OF THE INVENTION 
   Referring now to the drawings wherein the showings are for purposes of illustrating embodiments of the invention only and not for purposes of limiting the same,  FIG. 1  shows a snowplow assembly  20 , attached to a vehicle  10  according to one embodiment of this invention. The vehicle  10  may include an occupant compartment  12  from where an operator may operate the snowplow assembly  20 . With reference to  FIGS. 1 and 2 , the snowplow assembly  20  may include a snowplow mechanism  30 , a hydraulic system  50 , and a control system  140  that may enable the movement, for example the raising and lowering, of the snowplow mechanism  30 . The snowplow mechanism  30  may include a frame stricture  32 , a first wing  34 , and second wing  36 . The particular snowplow mechanism  30  shown is known as a V-plow but it is to be understood that this invention will work with any snowplow mechanism that includes at least two wings that can be moved independently of each other. The frame  32  and thus the snowplow assembly  20  may attach to the vehicle  10  in any conventional manner chosen with sound engineering judgment. 
   With reference now to  FIGS. 2-4 , the hydraulic system  50  may include a hydraulic unit  52 , one or more hydraulic cylinders  54 , and hydraulic piping, hoses and fittings as may be required. The hydraulic unit  52  may be mounted to the frame  32 , and may include a pump system  53 . The pump system  53  may comprise a pump  56  and motor  58 . The pump system  53  may cause the hydraulic fluid to move from a tank  55  and through the piping and hoses of the hydraulic system  50  as will be discussed further below. The hydraulic system  50  may be equipped to raise and lower the snowplow mechanism  30  relative to the surface being plowed and to move or pivot the snowplow mechanism  30  from side to side. These movements are well known in the art and thus will not be described in detail. Furthermore, these movements are not necessary with this invention although this invention will work well when these movements are provided. 
   With continuing reference to  FIGS. 2-4 , according to one embodiment of the invention, the hydraulic system  50  may include first and second cylinders  54   a ,  54   b  for use in independently pivoting the first wing  34  and the second wing  36 , respectively, about a pivot axis  38 . In one embodiment of the invention, the first wing  34  can be pivoted in either direction A or B and the second wing  36  can be pivoted in either direction C or D. Additionally, either the first wing  34  or the second wing  36  may remain in a fixed position while the other wing pivots about the pivot axis  38 . All such pivoting motions are well know and will not be described in great detail. The plump system  53  may pump a hydraulic fluid to a first cylinder control valve  62   a  and to a second cylinder control valve  62   b . The first cylinder control valve  62   a  may control the motion of the first wing  34  and the second cylinder control valve  62   b  may control the motion of the second wing  36 . While each cylinder control valve  62   a ,  62   b  is shown to be a three-position solenoid valve, it is to be understood that any means of selectively communicating the hydraulic fluid to the first and second cylinders  54   a ,  54   b  chosen with sound engineering judgment will work well for this invention. Hydraulic piping and/or tubing  64  may connect the pump system  53  to the first and second cylinder control valves  62   a ,  62   b  and to the first and second cylinders  54   a ,  54   b . Hydraulic piping  64  may also connect the first and second cylinders  54   a ,  54   b  to the first and second control valves  62   a ,  62   b  and to the tank  55 . According to one embodiment of the invention, the hydraulic system  50  may comprise a plurality of relief valves  66  in case of an over pressure circumstance. 
   With continuing reference to  FIGS. 2-4 , according to one embodiment, the hydraulic system  50  may also include a flow divider  60 . The pump system  53  may cause hydraulic fluid to be communicated from the tank  55  to the flow divider  60  via the hydraulic piping  64 . In one embodiment, the flow divider  60  may receive the hydraulic fluid from the pump system  53  and may provide a first hydraulic stream  65  having a first flow rate to the first cylinder  54   a  via the first control valve  62   a  and a second hydraulic stream  67  having a second flow rate to the second cylinder  54   b  via the second control valve  62   b . The first flow rate may be substantially the same as the second flow rate. By providing a first hydraulic stream  65  and a second hydraulic stream  67  with substantially the same flow rate, the flow divider  60  can cause the first and second wings  34 ,  36  to move at substantially the same time and substantially the same speed regardless of the disparity of loads acting on the first and second wings  34 ,  36 . 
   With continuing reference to  FIGS. 2-4 , when the flow divider  60  is activated, movement of the first and second wings  34 ,  36  is even regardless of the differing loads that may be placed on them. The particular flow divider  60  used with this invention can be any chosen with sound engineering judgment. In one embodiment, the flow divider  60  may be a type known as a restrictive flow divider. In general, a restrictive flow divider restricts hydraulic fluid flow to the cylinder requiring the lower pressure (the cylinder operating the wing with the lesser load) and opens a free path of hydraulic fluid to the other cylinder (the cylinder operating the wing with the greater load). In another embodiment, the flow divider  60  may be a type known as a rotary flow divider. In general, a rotary flow divider is two (or more) fixed displacement pumps/motors coupled together. The hydraulic flow into the flow divider equals the flow out, which is divided in the ratio of the displacements of the pumps/motors. The operation of restrictive flow dividers and rotary flow dividers is known in the art and thus will not be discussed further. 
   With continuing reference to  FIGS. 2-4 , according to one embodiment, the hydraulic unit  52  may be modular and may include one or more hydraulic modules  70  that can be mounted to a base plate  72 . Each hydraulic module  70  may include a manifold having one or more ports and one or more valves that may be mounted into the ports. Each hydraulic module  70  also may include a plurality of openings where corresponding hydraulic hoses can be attached to provide hydraulic fluid (and return) to the set of hydraulic components. The modularity of this embodiment of the hydraulic unit  52  may permit different combinations of hydraulic valves to be mounted to the same hydraulic module  70 . The modularity of this invention also may permit different combinations of hydraulic modules  70  to be mounted to the same base plate  72 . The tank  55  and hydraulic pump unit  56  may be sized to accommodate the maximum number of valves and hydraulic modules  70  that can be attached to the base plate  72 . The general operation of this modular hydraulic unit  52  is described in co-pending U.S. patent application Ser. No. 60/657,565 which is incorporated herein by reference. The inventors contemplate that one option for the hydraulic unit  52  is to include a hydraulic module  70  that consists exclusively of or includes the flow divider  60  of this invention. 
   With reference now to  FIGS. 4-5 , control of the first and second wings  34 ,  36  of the snowplow assembly  20  will be described. According to one embodiment of the invention, the control system  140  may comprise a microprocessor and associated control circuitry to control the flow of hydraulic fluid, and therefore, the movement of the snowplow assembly. In another embodiment of the invention, the control system  140  may comprise a controller  14  and a plurality of electrical wires  144 ,  145 ,  146 ,  147 , and  148 . The controller  14  may be primarily located within a single housing, as shown, or the controller  14  may include components positioned within one or more additional housings positioned near or apart from the shown housing. In one embodiment, the controller  14  may comprise a control device  141 , for example, a lever or switch, and may be positioned within the occupant compartment  12  of the vehicle  10 . The controller  14  may comprise any type of control device chosen with sound engineering judgment. The controller  14  may be fixedly attached to a portion of the vehicle  10 , such as the dashboard (not shown). According to another embodiment, the controller  14  may be selectively attachable to a portion of the vehicle  10  such as with the use of a hook-and-loop fastener (VELCRO® is one example). 
   With reference now to  FIGS. 4-5 ,  7 , in one embodiment of the invention, the controller  14  may be electrically connected to a battery  142  via the wire  144 . The controller  14  may control the flow of hydraulic fluid, and therefore the movement of the snowplow assembly  20 , by selectively communicating electrical energy to the pump system  53  and the solenoids located within the first and second cylinder control valves  62   a ,  62   b . The controller  14  may be electrically connected to the pump system  53  via the wire  145 . The controller  14  may be electrically connected to the first cylinder control valve  62   a  via the wire  146 . The controller  14  may be electrically connected to the second cylinder control valve  62   b  via the wire  147 . The controller  14  may be electrically connected to the flow divider  60  via the wire  148 . The control device  141  may comprise a plurality of control positions, for example, H (for holding the wings in their current position), R 1  (for retracting the first wing  34 ), E 1  (for extending the first wing  34 ), R 2  (for retracting the second wing  36 ), E 2  (for extending the second wing  36 ), EE (for extending both the first and second wings  34 ,  36  substantially simultaneously), and RR (for retracting both the first and second wings  34 ,  36  substantially simultaneously). The controller  14  may comprise any number of control devices, for example, 2, and the control device  141  may comprise any control device positions chosen with sound engineering judgment. 
   With continued reference to  FIGS. 4-5 , according to one embodiment of the invention, placement of the control device  141  in control device position H may provide that neither the first or second cylinder control valves  62   a ,  62   b  to be energized, the flow divider  60  is not activated, and the motor  58  is not operating the pump  56 . In control device position H both the first wing  34  and the second wing  36  may remain fixed in their current position. The placement of the control device  141  in control device position E 1  may not cause the flow divider  60  to be activated, but may cause the motor  58  to operate the pump  56  and the first cylinder valve  62   a  to be energized in such a way that allows hydraulic fluid to enter the first cylinder  54   a  and thereby extend the first wing  34 . The placement of the control device  141  in control device position R 1  may not cause the flow divider  60  to be activated, but may cause the motor  58  to operate the pump  56  and the first cylinder valve  62   a  to be energized in such a way that allows hydraulic fluid to enter the first cylinder  54   a  and thereby retract the first wing  34 . The placement of the control device  141  in control device position E 2  may not cause the flow divider  60  to be activated, but may cause the motor  58  to operate the pump  56  and the second cylinder valve  62   b  to be energized in such a way that allows hydraulic fluid to enter the second cylinder  54   b  and thereby extend the second wing  36 . The placement of the control device  141  in control device position R 2  may not cause the flow divider  60  to be activated, but may cause the motor  58  to operate the pump  56  and the second cylinder valve  62   b  to be energized in such a way that allows hydraulic fluid to enter the second cylinder  54   b  and thereby retract the second wing  36 . 
   With continued reference to  FIGS. 4-5 , the placement of the control device  141  in control device position EE may activate the flow divider  60 , may cause the motor  58  to operate the pump  56 , and may cause the first and second cylinder valves  62   a ,  62   b  to be energized in such a way that allows hydraulic fluid to enter the first and the second cylinders  54   a ,  54   b  and thereby extend the first and second wings  34 ,  36 . Upon activation, the flow divider  60  may provide the first hydraulic stream  65  and the second hydraulic stream  67 . The first hydraulic stream  65  and the second hydraulic stream  67  may have substantially the same flow rate as described above. The placement of the control device  141  in control device position RR may activate the flow divider  60 , may cause the motor  58  to operate the pump  56 , and may cause the first and second cylinder valves  62   a ,  62   b  to be energized in such a way that allows hydraulic fluid to enter the first and the second cylinder  54   a ,  54   b  and thereby retract the first and second wings  34 ,  36 . Upon activation, the flow divider  60  may provide the first hydraulic stream  65  and the second hydraulic stream  67 . The first hydraulic stream  65  and the second hydraulic stream  67  may also have substantially the same flow rate as described above. 
   With reference now to  FIG. 6 , according to another embodiment of the invention, the controller  14  may be selectively attached to a communication link  80  that communicates with the other snowplow assembly components. The communication link  80  may include a pair of plugs  83 ,  85  that selectively engage each other to complete an electrical connection. With this embodiment, the controller  14  may be a handheld controller  14  that can be easily moved within the occupant compartment  12  to any position comfortable for the operator. In yet another embodiment, the controller  14  is not hard wired to the snowplow assembly  20 , but may incorporate, for example, radio frequency control. Such radio frequency control is known in the art and, thus, will not be described here. The controller  14  may be used in any known manner to control the hydraulic unit  52  (including the flow divider  60 ), the first cylinder control valve  62   a , and the second cylinder control valve  62   b . In this way motion of the first and second wings  34 ,  36  (as well as other motions of the snowplow assembly  20 ) can be controlled by the operator. 
   Various embodiments have been described, hereinabove. It will be apparent to those skilled in the art that the above methods and apparatuses may incorporate changes and modifications without departing from the general scope of this invention. It is intended to include an such modifications and alterations in so far as they come within the scope of the appended claims or the equivalents thereof.