The present invention relates to motorized apparatus for spraying liquid additives and, in particular, to a front mounted spray assembly on a walk behind zero turn radius chassis that provides rapid and accurate spray patterns of liquid additives.
Many motorized approaches have been taken for applying additives such as nutrients and chemical modifiers, to soil for promoting growth and controlling foliage control to lawns and turf. One of the difficulties has been accurately applying such additives at high depositions rates in areas requiring clear delineation of growth. For instance, shrubbery and trees preferably have desired borders between the lawn and the surrounding mulch. If the fertilized is applied in the mulched areas, unwanted turf invasion is promoted. Similarly, in recreational areas, such as golf courses, different grasses are used for greens, fairways, approaches, and roughs. Each requires a different treatment package and application time. Application beyond the intended boundary can promote invasion of an unwanted species and a loss of the desired pattern.
While hand held spraying devices may be relatively accurately controlled, the application rate is low and labor costs are high, limiting the attractiveness in larger areas. Accordingly motorized spraying units are available for spraying larger areas, but have not overcome the problems of accurately defining the spray pattern at borders of contrasting landscape.
In one prior approach as described in U.S. Pat. No. 4,821,959 to Browning, a reservoir is mounted above and behind the operator on a riding lawn mower. An auxiliary engine operated hydraulic pump is used to disperse the additives through rearwardly disposed conduits and nozzles. With this rearward orientation of application, the operator cannot directly see the dispensing pattern and control the application of the additives to the area traversed by the mower, and must, instead, rely on the vehicle path as an approximation of the spraying pattern. A similar rear mounted spray applicator is disclosed in U.S. Pat. No. 5,553,676 to Conley.
U.S. Pat. No. 3,995,569 to Picardat discloses a riding lawn treating machine wherein liquid spray nozzles are disposed below and behind the operator. As with the above approaches, the operator is not able to see directly the spray pattern to avoid application in adjacent areas requiring different treatment protocols.
Walk behind dispensers have been proposed wherein dry granular or liquid treatment chemicals are applied within the confines of a housing located in front of the operator. U.S. Pat. No. 3,042,308 to Vicendese discloses a dispenser for feeding granular particles to a specially adapted blade of a rotary mower. U.S. Pat. No. 4,352,463 to Baker discloses a liquid treatment dispenser for spraying with a single nozzles from within a covered housing. Both applicators are manually propelled with accordingly low application rates. Also the surrounding housings preclude direct observation of the application pattern and are limited in the ability to accurately maneuver around defined areas and obstacles.
The present invention overcomes the above limitations by providing a sprayer with high maneuverability and high visibility for the purposes of edging and trimming around trees, landscaped and shrubbery areas, and areas of differing ground foliage.
The present invention comprises a walk behind zero turn radius (ZTR) drive unit and a front spray frame carrying a plurality of transversely spaced, clearly observable spray nozzles. The drive unit permits accurate and high productivity traverse of the application area with the ability to steer around obstacles and accurately traverse an irregular edging pattern. The spray frame includes a pair of folding spray arms having a first sect of dispensing nozzles. Another set of nozzles is positioned at the outer sides of the frame. All the nozzles are within the forward lateral view of the operator permitting ready steering of the drive unit around the borders of the application area. The nozzles are supplied with liquid from a frame mounted tank by an electric pump powered by the drive unit. The spray nozzles are controlled by an operator valve positioned adjacent the drive unit control, thereby allowing the operator to control the application during travel. For narrower application paths the boom arms may be raised and the boom nozzles inactivated by the control valve. The sprayer is also provided with an edging curtain that is removably mounted at the sides of the frame. The curtain provides a lateral spray barrier and drip edge that, in combination the ZTR drive, provides close delineation between adjacent areas to prevent unwanted treatment of a border area.
Accordingly, it is an object of the present invention to provide a motorized lawn treatment sprayer that is highly maneuverable in establishing a desired liquid spray pattern.
Another object of the invention is to provide a walk behind lawn treatment sprayer wherein the sprayer nozzles are operative in the front of the operator for clear visibility in establishing a delineated spray pattern with an adjacent area.
A further object is to provide a liquid treatment sprayer using a walk behind zero radius turn drive unit to provide high maneuverability and front mounted transverse spray nozzles that can be directly operator observed for accuracy in application.
A further object is to provide a liquid lawn treatment sprayer having a lateral drip barrier that prevents unwanted application to on adjacent areas.
The above and other features and advantages of the invention will become apparent upon reading the following detailed description taken in conjunction with the accompanying drawings in which:
Referring to the drawings,
The drive unit 12 is a suitable commercially available zero turn radius gasoline powered assembly of the type used for lawn equipment, such as mowers, with the lawn mower deck and front wheels removed. A suitable drive unit is available from Snapper, Inc. of McDonough Ga. The drive unit 12 includes a chassis 30 supported on laterally spaced rear drive wheels 32, which are drivingly connected through a hydrostatic drive transmission 34 to an internal combustion engine 36. The engine 36 is coupled to a fuel tank 38, an exhaust muffler 40, an alternator, and an electrical starting system for operation in a well known manner. A control handle assembly 44 is connected to the rear end of the chassis 30 and extends rearwardly and upwardly thereof. The handle assembly 44 is provided with a plurality of control levers 46 for controlling the drive direction, engine speed, wheel speed, and wheel turning, enabling the operator to control the operation of the sprayer direction in a walk-behind mode. The ZTR transmission allows the sprayer to drive in a straight path, turn about a vertical axis centrally intermediate the wheels, a zero turn radius, or turn radii therebetween.
Referring additionally to
Each wheel support 56 includes a support leg 64 welded at the rear upper end to the front rail 50 of the base frame 48. A cylindrical support sleeve 66 is vertically attached to the front end of the support leg 64. The wheels 57 include vertical pivot shafts journaled in the sleeves 66 whereby the wheels 57 are free to rotate in alignment with the drive path of the sprayer. A heat shield 68 is attached at the rear rail 52 of the base frame 48 opposite the muffler 40 to shield the tank 16 from engine exhaust heat.
Referring to
Referring to the schematic of
The control valve 94 has a closed position blocking the supply line 92, a first open position connecting with the frame outlet line 98 and a second open position connecting with both the arm outlet line 96 and the frame outlet line 98. Accordingly, upon starting the engine 36 with the valve 94 in the closed position, the pump 80 is powered by the alternator 82 and fluid from the tank 16 is recirculated through lines 84,88 past the assembly 90. In the first open position, fluid is pumped through the lines 92, 98 and dispersed by the frame nozzles. In the second open position, fluid is pumped through the lines 92, 96, 98 and dispersed by both the frame nozzles 20 and the boom nozzles 22.
Referring to
Referring to
In operation, with the edging curtain in position, the sprayer is operated with the arms 24 raised and the valve 134 conditioned for distributing the liquid through the frame nozzles 20. The outermost spray is downwardly directed by the edging curtain and accurately outwardly terminated at the lower drip edge of the curtain thereby providing a clearly delineated spray boundary.
It will be appreciated that the present invention fulfills the above objectives by providing a high productivity, highly maneuverable sprayer that allows the operator to accurately disperse liquid additives to discrete turf areas. Where extremely accurate edging is required to prevent unwanted species migration, the edging curtain may be deployed and the operator may accurately guide the spray pattern along irregular borders. The low center of gravity of the sprayer frame and tank provide stability over irregular contours. The folding arm assemblies permit wide swath extended arm spraying and narrow swath raised arm spraying for controlled spraying in narrow paths.
Having thus described a presently preferred embodiment of the present invention, it will now be appreciated that the objects of the invention have been fully achieved, and it will be understood by those skilled in the art that many changes in construction and widely differing embodiments and applications of the invention will suggest themselves without departing from the sprit and scope of the present invention. The disclosures and description herein are intended to be illustrative and are not in any sense limiting of the invention, which is defined solely in accordance with the following claim.
Number | Name | Date | Kind |
---|---|---|---|
5190218 | Kayser et al. | Mar 1993 | A |
5215255 | Kubacak et al. | Jun 1993 | A |
5533676 | Conley | Jul 1996 | A |
5662267 | Hulls | Sep 1997 | A |
5765754 | Emilsson | Jun 1998 | A |
6422483 | Yocom et al. | Jul 2002 | B1 |
6502771 | Wyne | Jan 2003 | B1 |
20040084552 | Huartson | May 2004 | A1 |