# Patent

## Title
Self-propelled stall cleaning apparatus

## Abstract

A self-propelled stall cleaning apparatus has a frame assembly, a pair of drive wheels, a motor attached to the assembly for driving the drive wheels and a motor driven collector head. The collector head has a pivoting fork with tines for collecting manure and debris. The fork picks up the manure and debris and tosses it onto a sifting conveyor. The sifting conveyor separates the manure from the bedding and delivers the manure to a lift conveyor which drops the manure into a collection bin. The collection bin is moveable from a stowed position to a dumping position and then back to a stowed position.

## Background
This is a continuation-in-part of application Ser. No. 13/733,212 filed Jan. 3, 2013.


FIELD OF THE INVENTION
This invention relates to a self-propelled stall cleaning apparatus.
BACKGROUND OF THE INVENTION
Bedding material used in animal stalls has to be periodically removed and replaced. Such bedding material can be made of wood shavings, straw or other suitable materials. Often the stalls have dirt floors, typically made of clay, soil or even concrete floors typically with rubber mats onto which the bedding is laid.
When the animal droppings accumulate, the bedding material is often rendered useless. However, properly maintained mucking of stalls has enabled the bedding material to last over more extended periods of time.
Cleaning stalls typically is a manual effort involving labor intensive use of pitch forks and wheel barrows.
When cleaning a single stall, this method is very reliable and reasonably efficient. In larger horse farms, this chore may involve cleaning many stalls often 20 or 30 or more. In these situations, the amount of manure removed can be very large and the work extremely fatiguing.
An attempt to solve this dilemma was disclosed in U.S. Pat. No. 6,334,538 entitled “Stall Cleaner” granted on Jan. 1, 2002. This apparatus was effectively a scoop shovel on wheels that a person operating could push into the bedding, sift out the manure and tilt it into a debris bag. The device improved the reuse of shavings, but was still manually operated. The apparatus, when loaded with manure, became very heavy and cumbersome and required manual unloading or dumping of the bag. This made the device somewhat impractical for large scale use. In fact it is only believed usable on a few stalls at most due to the lifting and weight penalties associated with its use.
The object of the present invention is to reduce or eliminate some if not all of these issues by providing a more user friendly motor driven apparatus requiring very little manual effort.
SUMMARY OF THE INVENTION
A self-propelled stall cleaning apparatus has a frame assembly, one pair of drive wheels, one pair of steerable wheels, a motor attached to the assembly for driving the pair of drive wheels and a motor driven collector head. The collector head has a pivoting fork with tines for collecting manure and other debris. The fork has a pair of pivoting arms each with a movable pivot end located in a cam guide wherein the pivoting arms are driven by a rotatable cam or link arm. The cam or link arm is connected through a clutch and head control lever wherein activation of the head control lever engages the clutch and moves the fork. Preferably, as the cam or link arm rotates it guides the pivot end along a guide path that first lowers the pivot ends, moves the fork forward in a generally horizontal thrust causing the fork to engage the bedding material and manure. The guide path turns vertically up causing the pivot to move upward causing the fork to rapidly rotate and pivot upwardly tossing the manure rearwardly.
The cam or link arm rotates 360 degrees causing the fork to lower, extend and move up on each return cycle to repeat the collection movement of down, forward, up and flip. The cam or link arm has a bearing connected to a shaft having a sprocket driven by a chain or belt which is engaged when the control lever is pressed causing the clutch to engage.
The self-propelled stall cleaning apparatus further has a sifting conveyor made of open wire mesh. The sifting conveyor receives the tossed manure and debris and sifts bedding material as it moves rearwardly to drop the manure and debris. A plurality of rods threaded transversely pass through openings in the mesh with the rod ends fixed into openings of roller chains on each side of said mesh. Each of the roller chains is placed on a forward sprocket and extends to a rear sprocket. One of the forward or rear set of sprockets is driven by the motor when the control lever is depressed engaging the clutch. The front sprockets preferably are idlers and the rear sprockets are driven.
The self-propelled stall cleaning apparatus further has a manure debris material lift conveyor. The lift conveyor receives the manure debris material rearwardly dropped from the mesh conveyor and lifts the material on an incline upwardly where it is dumped. The lift conveyor is made of chain and has periodically spaced slats extending across the width of the chain for carrying the material along the chain. The lift conveyor is connected to a forward lower sprocket pair and a rearward elevated sprocket pair, with a solid deck (platform) in between, wherein the lift conveyor chain and slats rotate about the platform to drop the elevated manure debris material at a rearward elevated location.
The self-propelled stall cleaning apparatus further has a collection bin positioned at the rearward elevated location below the lift conveyor. The collection bin has sides, two of the sides each have a curved guide track affixed. The collection bin is attached to the frame by at least one roller affixed to each side of the frame. The roller is in the guide tracks and the bin is movable from a low stowed position upwardly along the guide tracks to a tilted debris dumping position. Preferably, the bin is attached or rests on a movable platform. The self-propelled stall cleaning apparatus further has a means for lifting the bin. One means for lifting the collection bin is one of either hydraulic or pneumatic cylinders or a motor driven screw jack for moving the collection bin along the curved guide tracks. A second preferred means for lifting and tilting the collection bin includes driven gears that mate with complementary openings in curved gear driven members fixed to the collection bin. The self-propelled stall cleaning apparatus preferably has a second pair of forward wheels making the apparatus a four wheeled vehicle, one pair of wheels being motor driven. The self-propelled stall cleaning apparatus also has a pair of handles extending rearwardly from the frame. The handles extend on each side of the collecting bin and past the bin. The handles allow the operator to steer the device and activate the control levers. The handles have a throttle lever, a propulsion lever for driving the wheels and a clutch lever for engaging the collector head and conveyors. The apparatus also may have a collection bin lift lever or switch for dumping the filled bin.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of the self-propelled stall cleaning apparatus of the present invention.
FIG. 2 is a side plan view of the apparatus of FIG. 1 with one side of the frame removed for clarity.
FIGS. 3A-3E are side partial views showing the collection fork movement sequentially on a debris collection stroke showing the movement of the pivot end in the guide path. FIG. 3A being the start and FIG. 3E being the end at a debris tossing position, the cam or link arm being vertical and starting to move back to the horizontal re-start position of FIG. 3A.
FIG. 4 is a side plan view showing how the stall material is sifted on the sifting conveyor and dropped on the elevated conveyor.
FIG. 5 is a side plan view showing how the manure is lifted and dropped from the elevated conveyor into the collection bin.
FIGS. 6A-6C show a first embodiment of how the collection bin can be unloaded using a curved guide track and a lifting means. FIG. 6A showing the collection bin stowed loading position. FIG. 6B showing the collection bin in a lifted intermediate position and FIG. 6C showing the collection bin in a downwardly tilted dumping position.
FIG. 7A is a top plan view with the motor and housing removed to better show the drive chain or belt for driving the rear wheels of the apparatus.
FIG. 7B is a side view of the apparatus showing drive apparatus connected to the motor drive shaft in phantom. It being understood the view is looking through motor and housing to see the drive chains.
FIG. 7C shows a clutch assembly mounted on the drive axle of the apparatus.
FIG. 8 shows a steerable front wheel of the self-propelled stall cleaning apparatus.
FIGS. 9-11 show a preferred embodiment of how the collection bin can be unloaded using a curved guide track and a lifting means. FIG. 9 showing the collection bin on a stowed loading position. FIG. 10 showing the collection bin in a lifted intermediate position and FIG. 11 showing the collection bin in a downwardly tilted dumping position.
FIG. 12 is a fragmentary isometric view showing the curved guide track and the collection bin lifting means.



DETAILED DESCRIPTION OF THE INVENTION
Reference is first made to FIGS. 1 and 2. FIG. 1 is a perspective view of the self-propelled stall cleaning apparatus of the present invention, and FIG. 2 is a side plan view of the apparatus of FIG. 1 with one side of the frame removed for clarity. As illustrated, a stall cleaning apparatus 10 is shown. In the preferred embodiment, the stall cleaning apparatus 10 has a frame assembly 20 to which various mechanisms are attached. As shown in FIG. 1, the apparatus 10 has four wheels, two rear driven wheels 12 are driven by a motor 100, the forward wheels 14 are provided for stability and steering support. It is possible to design the apparatus with only two large drive wheels 12. If so constructed, the drive wheels 12 are positioned in such an orientation that they would be moved slightly forward to provide a center of gravity support for the entire apparatus 10. It is believed preferable however, that the device be made with four wheels as illustrated.
With reference to the forward end of the apparatus 10 is shown a motor driven collector head 30. The collector head 30 has a pivoting fork 32 as shown. This fork 32 has tines 33 for collecting manure and other debris. As best shown in FIGS. 3A-3E, on each side of the fork 32 is a pair of pivoting arms 34, each having a pivot end 36 located in a cam guide path 21. In addition, the apparatus 10 has a sifting conveyor 40 just rearward of the collector head 30. The sifting conveyor 40 as shown is made of an open wire mesh 42 that receives the tossed manure and debris material 2 and sifts the bedding materials and moves rearwardly to move the manure and debris material 2. Just rearward of the sifting conveyor 40 is shown a material lift conveyor 50. The lift conveyor 50 has a plurality of slats 52 extending transversely across and in between a pair of flat link chains 51. This lift conveyor 50 lifts the manure 4 and drops it at a collection bin 60 shown at the rearward most end of the apparatus 10. Extending along each side of the lift conveyor 50 is a pair of handles 70. These handles 70 provides a means for the operator to control the apparatus 10 and to operate a lever 80 which will engage the motor 100 to drive the apparatus 10 forward and also a lever 82 to operate the collector head 30 and conveyors 40, 50 so that the apparatus 10 can collect the manure 4. The collection bin 60 as shown, has a guide track 62 which enables it to be tilted along the curved guide track 62 and dumped when the bin 60 is full or as needed.
With reference to FIG. 2, a portion of the frame 20 is removed so that the drive mechanism which consists of a plurality of chains connected to the various conveyors 40, 50 and motor 10 can be easily observed. As shown, the motor sits above the assembly in a housing portion 24 of the frame 20. The motor 100 has a chain 102 and sprocket 101 assembly that is directed downward to a sprocket 103 attached to an axle 90 to which the forward end sprocket 44 of the sifting conveyor 40 and also is fixed and a collector head sprocket 39 is connected to the collector head 30. A sifting conveyor 40 extends from the forward sprocket back 44 to a rear sprocket 46 on an axle 92 and has the sifting conveyor 40 engaged about both sprockets 44, 46 in a continuous loop so that it can rotate about the sprockets 44, 46 when driven such that the material is received at a forward end of the sifting conveyor 40 and moved to a rearward end as it is being moved the material is being sifted. A plurality of rods 47 shown in FIG. 1 being threaded transversely passing through openings in the mesh 42 with the rod ends fixed into openings of roller chains 110 on each side of said mesh 42. Each of the roller chains 110 is placed on a forward sprocket 44 and extends to a rear sprocket 46. The forward sprocket 44 is driven by the motor 100 when the control lever 82 is depressed engaging a clutch 221. The front sprockets preferably are idlers and the rear sprockets are driven. Additionally, a small conveyor lifting sprocket 54 at the rearward end is shown attached to axle 92 along with the larger rear sprocket 46. These sprockets 46, 54 are attached to small shafts or axles inside bearings and bushings 88. Extending from the rearward lifting sprocket 54 to a sprocket 56 on the material lift conveyor 50 is a chain 120 which drives the material lift conveyor 50 in such a fashion that it drives the lift conveyor 50 such that the manure can be lifted upwardly into the elevated end of the lift conveyor 50 and the material dumped into the bin 60 as illustrated in FIG. 2.
With reference to FIGS. 3A-3E, an important aspect of the invention is how the collector head 30 functions with regard to collecting the manure 2. As shown in FIG. 3A, the collector fork 32 is shown in a horizontal position. An arm 31 is shown connected to the cam or link arm 35 about midway up the collection fork 32. At an end of the collection fork 32 is a pivot end 36. The pivot end 36 follows in a guide path 21 attached to the frame 20 as illustrated. When a lever 82 is activated on the handle 70 at the rear end of the apparatus 10, a clutch engages and the collector head 30 will start to move from the stowed position in FIG. 3A to a lowered position shown in FIG. 3B, as the cam or link arm 35 rotates clockwise about a pivot pin 37, the collection fork 32 is moved forwardly into the manure pile (not shown). The lowered fork tines 33 engage the debris and as the cam or link arm 35 continues to rotate upward, as shown in FIG. 3D, the pivot end 36 reaches a forward terminal end 23 of the guide path 21. When this occurs, continued movement of the cam or link arm 35 causes the fork 32 to flip upwardly as shown in FIG. 3E. This can occur in a very high speed movement as fast as approximately 2 rotations or cycles can occur every second. The rotation of the fork 32 is very rapid, approximately 120 cycles per minute. The speed of the mechanism can be varied by the throttle control 85 to vary the speeds higher or lower. The apparatus 10 can be designed to have various sized sprockets to further change the speeds. As further illustrated, once the position shown in FIG. 3E is achieved, the motion of the fork 32 is moved back to the starting position shown in FIG. 3A, thus lowering the fork 32 and moving it back to the upward stowed position. Thereafter the sequence is repeated through FIGS. 3B, 3C and 3D whereupon more manure can be acquired. To assist in the collector head 30, a second lever 80 is provided that enables the operator to engage the drive wheels 12 of the apparatus 10 into a forward driving motion. When doing this, the driven wheels 12 can be moved forward deeper into the manure pile as the apparatus 10 is cleaning the stall. All of this action is occurring based on the motor 100 driving the apparatus 10 and virtually no manual labor is required other than fundamental steering and actuation of the levers 80 or 82 at the handles 70.
With reference to FIG. 4, once the material 2 is collected and tossed, large manure 4 is conveyed on a sifting conveyor 40 as previously mentioned. As the sifting conveyor 40 continues to rotate, small particles 3 of sawdust, dirt, or bedding material can drop through the open mesh 42 of the sifting conveyor 40 as it is moved rapidly towards the rear end of the apparatus 10. Once the manure 4 reaches the end of the sifting conveyor 40, it is dropped onto the elevated lift conveyor 50 where the lift conveyor 50 has a plurality of slats 52 extending across the conveyor 50 to catch the manure 4 and carry it upwardly as shown in FIG. 5 towards the handles 70 and the bin 60. The bin 60 is shown in a stowed position resting on a platform or bar 25 affixed to the frame 20, at this point the manure 4 is being collected into the collection bin 60.
With reference to FIGS. 6A-6C, the operation of the collection bin 60 is shown. The collection bin 60 may or may not sit on a platform or frame 25 that traverses across the frame 20. If used the platform or frame 25 enables the collection bin 60 to sit in an upright, vertical position. The necessity of a platform or frame is somewhat dependent upon the mechanism selected for raising, lowering and pivoting the collection bin to empty the collection bin. In this embodiment along the side of the collection bin shown in dashed lines is one of the two curved tracks 62 and a pneumatic cylinder 65. This pneumatic cylinder 65 provides a lift mechanism to lift the bin, tilt it, and dump the manure 4. This operation is shown in FIG. 6A-6C. Once emptied, the cylinders are reversed (retracted) causing the bin to return to the stowed position shown in FIG. 6A. While the pneumatic cylinders 65 as shown connected to the collection bin 60 enable the collection bin 60 traverse along the guide track 62, it is also understood that these pneumatic cylinders could be replaced by hydraulic cylinders or compressed springs or other like mechanisms to assist in the lifting of the bin 60. Alternatively, motor driven screw jacks can be used, if so desired to provide an upward lift and assist in the movement of the collection bin 60.
Another alternative means for providing an upward lift and pivoting of the collection bin is disclosed with reference to FIGS. 9-12 in which components of the stall cleaning apparatus not part of this alternative means are omitted for clarity. FIG. 12 is a fragmentary isometric view showing the alternative means for providing an upward lift and pivoting of the collection bin and FIGS. 9-11 illustrate the operation of the alternative means for providing an upward lift and pivoting of the collection bin.
As disclosed above the collection bin 60 is disposed at the rear portion of the stall cleaning apparatus and is disposed between a pair of handles 70 that are grasped by an operator when the device is in use collecting manure and debris from a stall. Bracing supports 72 extend between the handles 70 and the frame (not shown in these figures) as shown and described above. As already described above curved guide tracks 82 are fixed to opposing lateral sides of the collection bin 60 with a roller mechanism 75 disposed in each of the guide tracks to stabilize and guide the collection bin during movement of the collection bin for dumping manure and debris from the collection bin. It is to be understood that on each of the opposing lateral sides of the collection bin the operative structure for raising, lowering and pivoting the collection bin is substantially the same.
A source of power, for example an electric motor 400, is fixed directly or indirectly to the frame (not shown in these figures). As will become apparent it is vital that the source of power be reversible in direction to provide for both lifting and lowering of the collection bin 60. The electric motor may be supplied with electrical current in any suitable manner such as a rechargeable battery or by an alternator driven by the gasoline engine located further forward on the stall cleaning device as previously described. A sprocket 402 is fixed to the rotatable shaft of the electric motor. A drive axle 406 is fixed to the frame (not shown in these figures) of the stall cleaning apparatus in a conventional manner including bearing blocks. Another sprocket 404 is mounted to the drive axle 406 in a conventional manner and a chain 408 is looped around the sprockets 402, 406 to transmit a driving force from the electric motor and cause the drive axle to rotate. Sprockets 410 are located at each end of the drive axle 406.
Mounting plates 412 are attached to the handles 70 and bracing supports 72 in any suitable manner to facilitate the installation of other components to the stall cleaning apparatus. An axle 414 extends through each mounting plate 412 using suitable bearing arrangements. A sprocket 416 is mounted on each of the axles 414 on an outboard side of the associated mounting plate 412. A drive gear 420, similar to a pinion, is mounted on each of the axles 414 on an inboard side of the associated mounting plate 412. Chains 418 are looped around each of the pairs of sprockets 410 and 416 to transmit a driving force from the drive axle 406 to the drive gears 420 located on the inboard sides of the mounting plates 412. Curved angle iron members 430 with L shaped cross sections have one leg of the L attached to a lateral side of the collection bin. The leg of the angle iron that is not attached to the collection bin is provided with a series of openings 434 having sizes complementary to the teeth of the mating drive gear 420 with the openings 434 spaced to mate with the teeth of the drive gear 420 when the drive gear rotates. The curvature of the angle iron members 430 and the curved guide tracks 82 is designed to move the collection bin 60 along a chosen path when the drive gears 420 are rotated. This arrangement of components has been found to operate efficiently when raising a collection bin containing a heavy load of manure and debris. It is to be understood that a curved toothed rack or a functional equivalent could be used in place of the curved angle iron without deviating from the scope of the invention claimed herein.
FIG. 9 shows the collection bin 60 at rest in an upright position as it is during the operation of the stall cleaning device to collect bedding from a stall, transport the bedding to the sifting conveyor, then transport manure and debris upwards and rearwards with the manure and debris material lift conveyor to have the manure and debris deposited into the collection bin as described above. During this stage of operation of the stall cleaning apparatus the sprockets 410 and 416 and chain are not rotated.
FIG. 10 shows the collection bin 60 during the operation of raising and pivoting the collection bin, or lowering and pivoting the collection bin. During this procedure the stall cleaning apparatus is not collecting, sifting or running the manure debris lift conveyor. The electric motor is operating either in forward or reverse, as is appropriate, to cause the sprockets 410 to rotate and via the chains 418 cause the sprockets 416 to rotate which in turn cause the drive gear 420 on a common shaft 414 with the associated driven sprocket 416 to rotate. As explained above the teeth of the drive gears 420 engage a succession of openings 434 causing the collection bin to be raising or lowered while being pivoted on a predetermined path. The movement of the collection bin is further stabilized along the predetermined path by the roller mechanism 75 positioned inside the guide track 62.
FIG. 11 shows the collection bin 60 fully raised and pivoted to allow manure and debris to fall out of the bin at a selected location. At this stage of the operation the sprockets 410, 416 and chain are still, but after the manure and debris have been discharged from the collection bin the direction of operation of the electric motor is reversed causing the rotation of the drive gears 420 to be reversed whereby the collection bin is pivoted and lowered to its starting position ready to receive another load of manure and debris.
It is believed important that the collection bin 60 be of large enough capacity that it can handle one or more stalls and therefore can hold a large volume of manure 4. The capacity of the bin 60 is sized to hold approximately 80 to 100 pounds of manure 4. As such the apparatus 10 itself can get quite heavy as the stalls are being cleaned. It is therefore important that the bin 60 be easily offloaded. As shown, the bin 60 provides a simple and convenient way for the operator to grasp the handle 66 to tilt the bin 60 with virtually no lifting required. This enables a person to be able to clean a stall rapidly with very little fatigue because the machine is operated with motor driven wheels 12 it is possible to have the apparatus 10 propelled in a forward direction or rearward direction if so desired dependent on the clutch and transmission system chosen for the apparatus 10. It is understood that the apparatus 10 uses the driven wheels 12 to support movement of the apparatus 10 in the stalls. It is further important that the width of the entire apparatus 10 be sufficiently narrow that it enables the entire apparatus 10 to operate between small stall doors. A preferred embodiment utilizes an 18′′ collection head, and the apparatus is 36′′ wide or less. Overall length of apparatus is 60′′ or less. This is important in that the apparatus 10 must enter into a stall and be maneuverable so that the operator can go into a stall turn the apparatus 10 and leave the stall if so desired. It is preferable the apparatus 10 provide both forward and rearward motion in the most ideal situations. However, if the apparatus 10 only has forward propulsion this quite acceptable as long as the apparatus can be pulled backward manually if so desired. Maneuvering of the apparatus 10 is facilitated by the use of the large rearward driven wheels 12. The forward wheels 14 are optional, but highly recommended as previously discussed. They provide additional stability and control and enable the operator to maneuver the apparatus 10 without any need of balancing the apparatus 10. If however, the apparatus 10 were made as a two wheel component, the operator would have to balance the entire apparatus 10. This is somewhat difficult in that the bin 60 as it loads will make the apparatus somewhat rearward heavy and will cause the operator to balance more additional weight. Therefore, it is believed most preferable the apparatus 10 be provided as a four wheeled apparatus. These and other alternative constructions are possible.
As shown in FIG. 1 the forward wheels 14 are in a fixed orientation that may make maneuvering the self-propelled stall cleaning apparatus 10 awkward in the confines of a relatively small stall. It is preferable that both of the forward wheels of the self-propelled stall cleaning apparatus 10 be steerable as shown for example in a fragmentary view in FIG. 8. A mounting bracket 300 with an L shaped cross section has one leg fixed to the frame 20 of the apparatus, for example by welding. This example of a steerable wheel is a castor which is understood to comprise a pivoting roller or wheel attached to an object at or near the bottom of the object. It is understood that there are many designs for castors and that any suitable castors or other steerable wheel arrangements may be fixed to a stall cleaning apparatus of the present invention. The exemplary castor of FIG. 8 has a fork 302 comprising a base 305 from which a pair of spaced apart legs 303, 304 extend. A castor mounting plate 306 is fixed to the base 305 of the fork 302. Four threaded fasteners 307 extend from the castor mounting plate 306 through openings in a leg of the mounting bracket 300 with appropriate nuts securing the castor to the mounting bracket. An axle 312 extends between the legs 303, 304 and is secured in place with suitable fasteners such as a nut 312. A wheel 309 is mounted in a rotatable manner with the axle 312 and a tire or other roller is mounted to the wheel. In this exemplary type of castor the castor mounting plate 306 and the base 305 of the fork are provided with mating raceways and bearing that allow the fork to pivot resulting in the forward wheels of the stall cleaning apparatus being steerable.
With reference to FIGS. 7A-7C, the drive mechanism for the driven wheel 12 is shown wherein the driven wheel 12 is engaged to the motor 100 through a transmission belt and/or chain 210 which drives and propels the driven rear wheels 12, as illustrated. With reference to FIGS. 1, 2 and 7B, the motor 100 is attached in the frame 20 of the apparatus 10 suspended above the sifting conveyor 40. As shown the motor 100 used is a gas powered motor, preferably a 4-cycle engine commonly used on lawn mowers, however with a horizontal drive shaft. This enables several mechanisms to be operated off of the shaft somewhat independently with the use of clutch mechanisms for both the propulsion of the drive wheels and the operation of the collector head and conveyor assemblies. The horse power needed to drive the device is considered to be within the range commonly used for small lawn mowers in the 4 to 6 hp range. Larger or smaller engines are contemplated depending on the construction material used for the frame.
As shown the frame 20 is preferably made of low cost steel. The frame 20 further has a bracing support 72 that extends from the handle 70 back to the rearward portion of the frame 20 to provide structural integrity of the entire apparatus 10 particularly at the handle 70 regions. This bracing support 72 includes a roller mechanism 75 positioned inside the guide track 62. This roller mechanism 75 is rotatable in a fixed position on the brace 72 such that the bin 60 can roll across the roller 75 on the side bracing 72 for the dumping of the manure 4 as previously discussed.
With reference to FIGS. 7A and 7B, the motor 100 has a portion of the drive shaft 202 connected to a drive sprocket 104 or pulley. As shown, the drawing shows toothed sprockets and chains, however, the drive assembly could alternatively use a belt and pulley drive as an equivalent means of propelling the rear wheels 12. The drive assembly has a motor chain 206 connected to a lower large sprocket 208 and a smaller sprocket 209 both fixed to a rotatable shaft 211. A wheel chain 210 is driven by the smaller sprocket 209 which is connected to the sprocket 112 on rear wheel axle 214. Engagement of the lever 80 on the handle engages a clutch assembly 220 to drive chains connected to the motor 100 for forward propulsion of the apparatus 10.
Variations in the present invention are possible in light of the description of it provided herein. While certain representative embodiments and details have been shown for the purpose of illustrating the subject invention, it will be apparent to those skilled in this art that various changes and modifications can be made therein without departing from the scope of the subject invention. It is, therefore, to be understood that changes can be made in the particular embodiments described which will be within the full intended scope of the invention as defined by the following appended claims.

## Claims

1. A self-propelled stall cleaning apparatus comprising:
a frame assembly;
a pair of handles extending rearwardly from the frame;
a pair of driven wheels;
a pair of non driven steerable wheels located forward of the driven wheels;
a motor attached to the assembly for driving the pair of drive wheels;
a motor driven collector head, the collector head having a pivoting fork with tines for collecting manure and other debris, the fork having a pair of pivoting arms each with a movable pivot end slidably located in a “U” shaped cam guide wherein the pivoting arms are driven by a rotatable cam or link arm, the cam or link arm being connected through a clutch and head control lever wherein activation of the head control lever engages the clutch and moves the fork, wherein as the cam or link arm rotates it guides the pivot end along the “U” shaped guide path that first lowers the pivot ends, moves the fork forward in a generally horizontal thrust causing the fork to engage the manure, the “U” shaped guide path turns vertically up causing the pivot to move upward causing the fork to rapidly rotate and pivot upwardly tossing the manure rearwardly and wherein the apparatus has an overall width and an overall length to be maneuverable into and turnable within a stall for cleaning and removal of manure and other debris;
a sifting conveyor made of open wire mesh, the sifting conveyor receives the tossed manure and debris and sifts bedding material as it moves rearwardly to drop the manure and debris;
a manure debris material lift conveyor, the lift conveyor receives the manure debris material rearwardly dropped from the mesh conveyor and lifts the material on an incline upwardly where it is dumped; and
a collection bin positioned at the rearward elevated location below the lift conveyor and wherein the collection bin is affixed to curved guide tracks on opposing lateral sides of the collection bin with rollers fixed to the frame assembly and disposed in the guide tracks, the collection bin being movable from a low stowed position for receiving manure and other debris to an upward tilted debris dumping position by an operator activated lift mechanism comprising curved members fixed to opposed lateral sides of the collection bin and a motor driving a power transmission assembly including drive gears that mate with complementary openings in the curved members.

2. The self-propelled stall cleaning apparatus of claim 1 wherein the cam or link arm rotates 360 degrees causing the fork to lower retract and move up on each return cycle to repeat the movement of down forward up and flip.

3. The self-propelled stall cleaning apparatus of claim 1 wherein the cam or link arm has a bearing connected to a shaft having a sprocket driven by a chain or belt which is engaged when the control lever is pressed causing the clutch to engage.

4. The self-propelled stall cleaning apparatus of claim 1 further comprising a plurality of rods threaded transversely extending passing through openings in the mesh with ends fixed into openings of roller chains on each side of said mesh, each of the roller chains being placed on a forward sprocket and extending to a rear sprocket driven by the motor when the control lever is depressed engaging the clutch.

5. The self-propelled stall cleaning apparatus of claim 4 wherein the front sprockets are idlers and the rear sprockets are driven.

6. The self-propelled stall cleaning apparatus of claim 1 wherein the lift conveyor is made of chain and has periodically spaced slats extending across the width of the chain for carrying the material along the chain.

7. The self-propelled stall cleaning apparatus of claim 6 wherein the lift conveyor has a platform connected to a forward lower sprocket pair and a rearward elevated sprocket pair wherein the lift conveyor chain and slats rotate about the platform to drop the elevated material at a rearward elevated location.

8. The self-propelled stall cleaning apparatus of claim 1 wherein the collection bin rests on a platform or frame.

9. The self-propelled stall cleaning apparatus of claim 1 wherein the handles have a throttle lever, a propulsion lever for driving the wheels and a clutch lever for engaging the collector head and conveyors.

10. The self-propelled stall cleaning apparatus of claim 9 wherein the apparatus further comprises a collection bin lift lever or switch for activating the lift mechanism for dumping the filled bin.