Abstract:
A line striper is attached to a vehicle with a two point hitch and has a swivelable rotatable wheel mounted thereunder to support the striper on the ground. A main beam is releasably clamped and may be slid from side to side depending on operator preference. The gun boom may then be located on the desired side. A delay feature on the control allows the operator to look ahead on a sighting camera and pick the point at which he or she desires striping to start (or stop or any other operation). The controller then compensates for the calibrated distance between the sight point and the spray gun and then starts and stops the gun at the appropriate time given road speed.

Description:
This application claims benefit of provisional appln 60/015,637, filed Apr. 19, 1996. 
    
    
     BACKGROUND OF THE INVENTION 
     Apparatus for striping roads which does not require a dedicated vehicle is shown in U.S. Pat. No. 5,368,232, the contents of which are incorporated by reference. While such a device is quite effective, one drawback is that limited amounts of weight may be cantilevered off the rear end of a vehicle, particularly when the vehicle is smaller and/or has a relatively low load carrying capacity. 
     SUMMARY OF THE INVENTION 
     It is therefore an object of this invention to provide an apparatus which may be attached to most any vehicle and yet which may have a substantial amount of weight for the mechanism thereon. 
     It is further an object of this invention to provide a road striping apparatus which is easy to set up and operate by one person as compared to many of the prior art devices which require two operators. 
     It is further an object of this invention to provide a device in which a single paint applying boom may be easily and quickly switched from side to side and which may be easily placed in a transport position for transit between striping locations. 
     It is yet further an object of this invention to provide a device which is easy to set up and which provides a delay which encourages efficient one operator operation. 
     The device is intended to apply stripes to roadways to either match existing lines exactly or to apply new stripes per specification with one person operation. Such an operation is allowed by utilizing one person operation and providing a monitor delay system and easy to memorize finger touch controls. When the control system is powered up, all gun controls are switched to a guns off position and bead control is on; that is when any paint is turned on beads are applied to that paint. When powered off, all programmed skips, delays, and bead gun distances are retained in memory to be recalled if necessary. 
     The striping mechanism is designed for attachment to a towing vehicle by means of a two-point hitch and the rear of the striping mechanism is supported by a swivel mounted support wheel which in the preferred embodiment has a damping mechanism as well as spring mountings. 
     The support beam may be releasably clamped and moved from side to side so that the spray gun boom arm may be utilized on either side of the striping mechanism also by releasably clamping to the beam. 
     The bead tank is provided with a concave spherically shaped top having a central hole and a plug which is actually located in the tank and which may be pulled upwardly by means of a handle. Thus when the plug is pulled upwardly and the tank pressurized, the tank is sealed yet the tank may easily be filled by releasing pressure and popping the plug downwardly. The plug is retained from falling into the tank by means of a handle which is wider than the hole. During transport, the boom arm is swung upwardly and latched at the center of the mechanism. A gasoline engine powers a hydraulic power supply which in turn runs three hydraulic pumps for supplying of fluid at airless pressures to the three spray guns. The gasoline engine also powers a small air compressor which provides air pressure to the bead supply unit. 
     The control provides an auto cycle set up switch which allows the operator to stay in the vehicle and program the controller to place new lines over existing skip lines. When the auto cycle set up button is pressed, the skip set up screen appears on the LCD screen and the skip cycle will be flashing. The operator then simply pushes the mark button at the start and end of the cycle and the appropriate distance will appear on the LCD screen under the skip cycle. This can be accomplished at the same time the guns are painting by simply having the appropriate paint guns selected. For greater accuracy, the operator would want to stop on the first mark and then press mark then drive forward to the end of the cycle and stop again and press mark then back up and start painting. After the mark button has been pressed the second time, the auto cycle set up button turns off. 
     The cycle button can be changed any time thereafter by using up and down arrow keys. The paint line length is a manual input and can be changed at any time. The three guns may be independently switched on and off from one another and may either be switched into a solid striping regime or skip lines. 
     The delay button brings up the LCD screen for adjusting the feature monitor delay. The monitor delay is an important part of one man operation and eliminates the need for the operator to look back at the guns when starting, stopping and line changes. Simply make all line selections at the appropriate time when the cross hairs on the monitor reach these points. The delay distance is the number of feet from this point back to the paint guns. The microprocessor simply holds all keyboard commands for a set amount of traveled feet. The operator needs to watch the monitor for alignment purposes so it makes sense to run the paint controls from the same view screen. 
     These and other objects and advantages of the invention will appear more fully from the following description made in conjunction with the accompanying drawings wherein like reference characters refer to the same or similar parts throughout the several views. 
    
    
     A BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of the instant invention. 
     FIG. 2 is a frontal view of the control panel of the instant invention. 
     FIG. 3 is a partially exploded view of the instant invention. 
     FIG. 4 is a view of the frame of the instant invention. 
     FIG. 5 is an exploded view of the frame of the instant invention. 
     FIG. 6 is an exploded view of the boom of the instant invention. 
     FIG. 7 is an exploded view of the caster wheel of the instant invention. 
     FIG. 8 is an perspective view of the instant invention in transport position. 
     FIG. 9 is an exploded view of the bead gun. 
     FIG. 10 is a perspective view of the two point hitch. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     The following table shows the components: 
     
         ______________________________________A   Viscount I Hydraulic Motor               Operates the displacement pumpB   Boom Arm Hitch Pin               Secures spray gun boom arm when the               Striper is in transportC   Displacement Pump               Provides fluid to be sprayed through               spray gunD   Fluid Filter    Filters fluid between source and spray               gunE   Breather Cap    Provides a means for hydraulic reservoir               ventilation, oil check and fillF   Pressure Drain Valve               Relieves fluid pressure when openG   Fluid Outlet Tube               Hose carries fluid from displacement               pump to spray gunH   Hydraulic Reservoir               Holds 12 gallons of hydraulic oil for               hydraulic pumpI   Hydraulic Select/Bypass               Selects displacement pumps for guns 1    Valve           &amp; 2, or 3; or bypasses all gunsJ   Hub             Allows trailer wheel to swivelK   Hydraulic Pump  Creates hydraulic pressure for the               hydraulic power supply systemL   Main Beam       Supports spray gun boom armM   Bead Tank       Holds up to 300 lb. of glass beads for               continuous sprayingN   Air Regulator   Allows regulation of bead tank air               pressureO   Compressor      Provides pneumatic supply to switch               paint spray gun and bead spray guns on               and off as directed by the programmable               skipline controlP   Engine          18.0 HP gasoline engineR   Tail Light      Standard tail light that includes brake               and directional lightsS   Hydraulic Pressure Knob               Provides adjustment of hydraulic               pressure. Clock wise rotation increases               pressure. Pressure setting is locked with               inner lock knob.T   Dolly           Used to roll Striper into place for               connection to tow vehicle and hold               Striper upright when disconnected               from tow vehicle and storedU   Spray Gun Boom Arm               Allows striping on either side of the tow               vehicle at adjustable distancesV   Bead Spray Gun  Sprays beads when commanded by the               programmable skipline controlW   Paint Spray Gun Sprays fluid when commanded by the               programmable skipline controlX   Fuel Tank       Holds gasoline______________________________________ 
    
     FIG. 8 shows gun carriage 10 in its transport position when it is swung up and locked. The paint pumps C in the preferred embodiment are a hydraulically (A) operated pump C of the Viscount line also manufactured by Graco Inc. When it is desired to paint, the boom arm U is unlatched and slid to one end where it is locked using the latches 12, wherein it may then pivot and is supported by the road wheel 14. 
     The framework 16 of the striping mechanism 10 itself attaches to the vehicle by means of two receivers 22 holding trailer hitch balls of conventional design. Thus the two-point hitch 18 (one side is shown with an identical hitch on the other side) allows the striping mechanism 10 to maintain absolute linearity with the vehicle 20 itself and does not suffer from articulation problems present in typical trailers. A pivotable wheel 24 is located on the rear end of the striping frame to provide support and a damping mechanism 46 is utilized in hub J in order to prevent the swivel wheel 24 from becoming unstable at speed. 
     FIG. 10 shows the two point hitch 18 having a hitch frame 18A which is part of a normal frame mounted hitch such as manufactured by DRAW-TITE. Two hitch receivers 18B are clamped to frame rail 18A as shown allowing use of standard hitches for the two point hitch 18. 
     As can be seen on the frame 16, the three pumps C which each are designed to pump two different colors (typically one being white and the other being yellow) are driven off a common gasoline engine P and hydraulic power supply K. 
     A bead container M is utilized along with a small compressor O driven off the same gasoline engine P and the bead container M is pressurized in order to supply beads to the bead gun V. The bead container M is provided with a knockout plug 60 of the type commonly used in sandblasting equipment and a depressed upper surface 58 which allows easy loading of beads and quick locking and sealing of the container M. 
     As can be seen particularly in FIG. 7, wheel 24 rides on axle 28 and pivot member 30 which pivots about pivot point 32 on swivel fork 34. A spring pivot (36) mounts a pair of rod ends (38) which extend through springs 40, into mounting plate 42. Thus, rod ends (38) are always under tension and serve to compress springs 40, and under suspensions, loads will compress even more. 
     Swivel axle 44 extends upwardly from swivel 34 through damping mechanism 46 in Hub J. One or more belleville washers (48) serve to preload a damping surface member (50) which may be manufactured from an acetal homopolymer (100AF); which is impregnated with Teflon or a similar material. 
     As can be seen in the figures, the carriage rod/main beam L may be unlocked and moved to either side of the vehicle and thence the boom arm moved to the outside of the carriage rod L so that the stripe may be positioned as desired. When it is desired to detach the striping mechanism from the vehicle, two supports T are cranked down by hand which lift the two hitch mechanisms 18 off the balls and allow the whole mechanism to be wheeled away from the vehicle. 
     Frame 16 has a channel 52 thereon, with a pair of clamps (54) of the over-center type serve to clamp and retain main beam L in the channel 52. Main beam L is desirably manufactured from a piece of square tubing with a piece of plate welded to one corner thereof, with clamps 54 gripping the steel plate. Bolts (56) may be inserted on either end to limit the travel of main beam L. Upon reaching the job site, the operator may merely unlatch transport pin B and unclamp clamps 12 and 54. The operator can then extend main beam L to the side on which it is desired a stripe and spray gun boom arm (U) moved outwardly to the striping position and clamp 12 locked again with boom U lowered so that road wheel 14 contacts the ground. The spray guns (W), may then be positioned as desired along with bead guns (V). 
     Bead guns V are shown in more detail in FIG. 9 and have a teardrop shaped needle 64 which reduces chattering by encouraging laminar flow therethrough. 
     The attached operation instructions show the menu flow chart for the controller and help explain set up and operation. The following table expands on the controls shown in FIG. 2: 
     
         ______________________________________switch/Indicator Explanation______________________________________A   POWER ON/OFF switch                ON enables battery DC power to                the Control and to the engine. OFF                removes power from the Control                and the engine. Engine can not be                started when this switch is in the                OFF position.B   Paint gun switches 1, 2 and 3                Enables/disables paint gun 1, 2                and 3.                Up - dashed line.                Center - off.                Down - continuous line.C   RESET/HOLD switch                HOLD disables paint guns 1,2 and                3 and resets the internal cycle                counter.D   ADV/RET switch   Used in conjunction with the                arrow switches to adjust the                paint line position to match a                previously painted line. ADV                allows the dash line to be moved                forward. RET allows the dash line                to be moved closer.E   BEADS ON/BEADS   Enables/disables bead gun    TEST             BEADS ON (up) - beads start to                flow when paint guns start to                paint.                Center - off.                BEADS TEST (down) - continuous                bead flow.F   I/O cable port   The I/O cable connects here and                at the RL. Also brings in 12 Vdc                from the RL                in the paint and cycle length menu.H   SYSTEM DELAY ON/OFF                OFF (unlit) - the paint guns and                RESET/HOLD respond                immediately.                ON (lit) - the paint gun switches                1, 2 and 3; and RESET/HOLD                switch are delayed by the preset                system delay distance.I   MENU arrow switches                Used to switch between menus,                adjusting values and resetting                values.J   Arrow switches 1, 2, 3                Used in conjunction with the    and blank        ADV/RET switch to adjust the                paint line position to match a                previously painted line. When                the ADV/RET switch is in the                ADV position, pressing the arrow                switch moves the dash line                forward, incrementally. When the                ADV/RET switch is in the RET                position, pressing the arrow                switch moves the dash line                closer.K   Remote mph display                Provides mph output to REMOTE    plug-in          MPH DISPLAYL   Remote control switch                Provides two remote functions    plug-in          for the paint gun switches 1, 2                and 3:                1. Skip line - acts as a cycle reset                when tapped and a cycle hold                when held down. Has no effect on                solid line painting.                2. Solid line - turns paint guns on                when hald down and off when                released.______________________________________ 
    
     It is contemplated that various changes and modifications may be made to the line striper without departing from the spirit and scope of the invention as defined by the following claims.