BRIEF DESCRIPTION OF THE DRAWINGS
Certain embodiments are shown in the drawings. However, it is understood that the present disclosure is not limited to the arrangements and instrumentality shown in the attached drawings.
FIG. 1 is an exploded view of the prior art deflection system of the SPYKER™ push spreader model 98-22.
FIG. 2 is a partly exploded perspective view of the broadcast spreader and the spreader deflection plate and apparatus according to the present disclosure.
FIG. 3 is an exploded perspective view of the deflector plate assembly according to the embodiment of FIG. 2.
FIG. 4 is a perspective view of the deflector plate assembly of FIG. 3.
FIG. 5 is a partial upper side functional 3D view of the deflector plate assembly used to illustrate the particularities of the deflection plate of the broadcast spreader of FIG. 2.
FIG. 6 is a flow chart that schematically illustrates the steps of the method for uniform spreading of material over a horizontal surface using a broadcast spreader and a deflection plate as described in FIG. 2.
DETAILED DESCRIPTION
For the purposes of promoting and understanding the principles disclosed herein, reference will now be made to the preferred embodiments illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope is thereby intended. Such alterations and further modifications in the illustrated devices and such further applications of the principles disclosed as illustrated herein as being contemplated as would normally occur to one skilled in the art to which this disclosure relates.
FIG. 2 of the present disclosure relates to a broadcast spreader 1 made of a hopper 2 having a bottom opening 3 with a periphery 4. The broadcast spreader 1 further comprises a frame 5 for supporting the hopper 2. In a preferred embodiment, the frame 5 includes a handle 6 for operating the broadcast spreader 1. It is understood by one of ordinary skill in the art that while a hopper 2 made of a rectangular volumetric shape is disclosed, any shape of container or hopper 2 made of metal, plastic, or any other formable material of any geometry able to form a container for seeds, granular material, and other loose material 7 (“material”) is contemplated. While material 7 is generally purchased in a bag or canister to be emptied into the hopper 2 by a user, the present disclosure also contemplates the use of a broadcast spreader where the material 7 is a rigid or partly rigid body contained in a bag or canister of material 7 that may itself be used as the hopper 2 or in conjunction with an interface on the frame 5 to be attached to the bag or canister of material 7.
The broadcast spreader 1 also comprises a wheel 8 attached rotatably to the frame 5 by an axle 9 for movement of the broadcast spreader 1 across a surface (not shown) such as soil, grass, roads, and the like. In one embodiment shown in FIG. 2, two wheels 8 are attached to the frame supported by a horizontal axle 9. It is understood that any regular means of ground transportation of a small device may be used in association with a combination of wheels, frames, or rotational axles. The broadcast spreader 1 is further equipped with a rotatable spreader plate 10 located below the hopper 2 to spread the material 7. In the embodiment shown in FIG. 2, the rotatable spreader plate 10 is functionally connected to the horizontal axle 9 via a series of gears (not shown) protected by a cover 11. In one embodiment, when the user pushes the broadcast spreader 1 along a surface, the wheels are functionally connected to the axle 9 whereby linear movement of the spreader translates rotational motion to the axle 9. One gear (not shown in detail) is attached to the axle 9 and another gear (not shown in detail) is connection to another axle 12 for meshing engagement such that rotational movement of axle 9 is translated to axle 12. The other end of axle 12 is connected to the rotatable spreader plate 10. The spreader plate shown in FIG. 2 is equipped with surface ribs 13. It is understood by one of ordinary skill in the art that, while a gear system (not shown, but described herein) facilitates rotation of the spreader plate 10 of flat, square geometry, any type of rotation device, either mechanical or electrical, able to rotate the spreader plate is contemplated.
The broadcast spreader 1 further comprises a deflection plate assembly 14 shown in detail in FIGS. 3-4. The deflection plate assembly 14 includes a guide plate 15 with a flow opening 16 and a guide 17. The guided plate 15 is connected to the periphery of the bottom opening 3 as partly shown in FIG. 2. Returning to FIG. 3, a pattern plate including a deflection opening 19 is inserted in the guide 16. The deflection opening 19 has peripheral angled tabs 20. A closure plate 21 is inserted within the deflection plate assembly 14. In the embodiment shown in FIG. 3, the guide 17 on the guide plate 15 is made of two L-shaped rails located on each side of the flow opening 16. The guide plate 15 is secured to the hopper 2 by four corner fixation bolts (not shown) in fixation holes 22 located between the guide plate and the pattern plate. The closure plate 21 in one embodiment is encased within the guide plate 15 and the pattern plate 18. It will be understood by one of ordinary skill in the art that the closure plate 21 serves to vary the opening of the hopper bottom 3. Possible embodiments of an opening variation mechanism are shown in FIGS. 2 and 5.
The broadcast spreader 1 is equipped with a U-shaped tab 26 attached at the bottom of the U on the hopper 2. One branch of the U is secured to the handle 6 and the other branch is inserted to operatively connect the closure plate 21. The closure plate 21 is moved over the flow opening 16 to control the flow of material 7 from the hopper 2 through the bottom opening 3, the flow opening 16, and the deflection opening 19 onto the rotatable spreader plate 10. In an embodiment shown in FIG. 5, the closure plate 21 is moved over the flow opening 16 with the help of a manually operated U-shaped tab 26 moving in a slot 27. The movement of the closure plate 21 is also limited by the position of the pattern plate 18 under the bottom opening 3. In one embodiment, a thumb screw 24 equipped with a threaded end (not shown) is secured to a slide gate bracket 23 and inserted into a threaded opening on the pattern plate 18. The rotation of the thumb screw 24 allows for differential lateral movement of the pattern plate 18 under the bottom opening 3.
FIG. 5 further shows where the peripheral angled tabs 20 with openings on the deflection opening 19 only cover a fraction of the periphery of the deflection opening and deflect only a fraction of the flow of material. In one embodiment shown in FIG. 5, a cascade-like effect is created over the rotatable spreader plate 10.
It will be understood by one of ordinary skill in the art that in the above described configuration relates to an improved broadcast deflector plate designed to create a cascade-like deflection of the material over a series of angled tabs separated by open intervals where indirect flow is created. As illustrated in FIG. 5, a first volume of material falls without deflection directly through the open intervals onto the spreader plate at a first position, and a second volume of material is deflected by the tabs to a preferential location closer to the center of the spreader plate, while the presence of openings between the tabs allows for a third volume of material to cascade in all directions around the tabs and reach all intermediate positions on the spreader plate. The tabs are of sufficient length and width in proportion to the intervals between tabs to create a cascade effect of material in order to effectively deflect the material uniformly over the spreader plate. FIG. 5 is designed to show this effect by illustrating a series of dashed lines corresponding to potential movement of material 7 over the peripheral angled tabs 20.
In an embodiment, the deflection openings are rectangular tabs 20 of square geometry located on a single side of the deflection opening 19. In the configuration illustrated in FIG. 5, the tabs 20 deflect about half of the material 7 at an angle in a range of 15 to 45 degrees from horizontal and preferentially at about 30 degrees from horizontal. It is understood that the geometry and location of the tabs 20 as shown is only one possible embodiment of a deflector plate assembly 14 with peripheral angled tabs 20, but what is contemplated is any deflection system based on tabs allowing a fraction of the material 7 to pass directly onto the rotatable spreader plate 10. The size, geometry, spacing, and deflection angles are to be determined based on the sizes, shapes, and other mechanical characteristics of the particles within the material 7. As a nonlimiting example, if dense, humid soil is used as material 7, the angled tabs need to be sufficiently spaced to allow soil to be deflected by the tabs and the width of the tabs must also be sufficiently thick to deflect the material 7. If a fine, powdered material is used, the tab geometry and spacing may be closer and resemble a fork-like geometry. It is understood by one of ordinary skill in the art that calibration of tabs is achieved without an undue burden associated with experimentation.
What is also contemplated is a method of spreading material uniformly over a horizontal surface using a broadcast spreader equipped with a deflection plate as described previously and as shown in FIG. 6. The method comprises the steps of calibrating the angle, the interstice distance, and the size of the peripheral angled tabs to create a sufficient section of deflection in the deflection opening 101 based on characteristics of the material to be spread, placing a material in the broadcast spreader 102, pushing the frame in order to activate the rotatable spreader plate 103, allowing the material to flow through the bottom opening 104, having part of the material fall directly onto a first close section of the rotatable spreader plate 105, having part of the material fall on the peripheral angled tabs for redirection onto the second section of the rotatable spreader plate 106, and allowing the material from the first section and the second section on the rotatable spreader plate to be dispersed on a horizontal surface 107.
In one embodiment of the present disclosure, the material is placed in the hopper 2 and the frame 5 is pushed using the handle 6. The flow of material 7 through the broadcast spreader is controlled by the opening of the closure plate 21 in association with the pattern plate 18 as controlled using a lever mechanism and a thumb screw mechanism. It is understood by one of ordinary skill in the art that while this method generally discloses a method of use of the broadcast spreader as disclosed in FIGS. 2-5, the method disclosed is also applicable to other type of broadcast spreaders.
Persons of ordinary skill in the art appreciate that although the teachings of the disclosure have been illustrated in connection with certain embodiments and method, there is no intent to limit the invention to such embodiments and method. On the contrary, the intention of this application is to cover all modifications and embodiments failing fairly within the scope of the teachings of the disclosure.
Patent Application
20080078850
