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Manure Spreader

Manure Spreader

The following is a custom attachment for a skid steer. It is compatible with all regular, full-size skid
steers on the market. It’s designed to scoop manure, then transport it to a different location where it
can then spread the manure evenly onto the ground in order to fertilize the land.

Category

Description

The ideal market for this is small farmers/ranchers with horses. Typically, the horse stalls are cleaned daily/weekly and the manure is put in piles. When the piles get large enough, they need to be spread onto the land to conserve space, but also to fertilize the land which is typically the horse pasture or other farmland. Currently, these horse owners typically use a manure spreader trailer. The trailer needs to be filled up with a tractor, skid steer, or by hand. It’s then designed to spread manure onto the land while being towed by a 4-wheeler or tractor or horses. The inventor believes that the current method is costly and cumbersome and that for horse owners that already own a skid steer, this product is an easy sell.

Below is a top-level view of the product. It consists mainly of a bucket, cover and beater shaft.
Everything is made from steel and welded together, mostly ¼” thick.

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This picture shows the cover opened when the hydraulic cylinders retract. (hoses are hidden) When the
lid is opened it allows you to use the bucket to scoop manure without the beater shaft being in the way.
The plate on the back of the bucket is a “quick attach plate” and is an industry standard part which
allows this product to connect to any standard skid steer.

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This picture shows the front view when the cover is opened. The bucket is 72” wide which is a typical
width. It has more volume than a typical rock bucket, it’s more similar to a snow/mulch bucket.

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The beater shaft is designed to spin forward so the beater blades throw manure out of the top of the
bucket above the shaft. The blades are angled in 2 directions and bent for maximum influence on the
manure. The blades are welded onto a piece of square tubing. A 1.25” solid round shaft runs inside the
square tubing and is welded at each end. This round shaft is what sticks through the bearings and what
the sprocket attaches to.

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This is a view with the chain cover off. This is a chain driven shaft. The hydraulic motor drives the top
sprocket and the chain drives the bottom sprocket which spins the shaft. The current sprockets are each
the same size so it’s a 1:1 ratio though this could be changed in the future. There is a tensioner that is
simply a cylindrical piece of UHMW which is a high strength, highly abrasion-resistant plastic. This
tensioner pivots on one screw and allows the user to tension the chain. Over time the chain will become
loose and the user can keep adding tension.

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When the operator turns the beater shaft on (using a button in the skid steer that’s not part of this
product) oil will flow in the direction shown. The oil goes to each of the cylinders as well as runs through
the motor in the direction to spin the shaft forward. The high-pressure oil is shown in red and after it
flows through the motor is loses pressure (shown in teal). IMPORTANT: note that when you pressurize
the system in this direction (we’ll call it “forward” for now) you are ultimately extending the cylinders
AND rotating the motor forward at the same time. There is no way to separate these functions. When
the lid is fully open and the user wants to close the lid, they would hit forward button and this will spin
the shaft forward and extend the cylinders (which closes the lid) at the same time.

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This is the flow of oil when the operator hits the “reverse” button. High pressure oil (red) flows through
the top of the cylinders which retracts them. The oil also tries to flow backwards through the motor,
however, we have a check valve in this direction which prevents the oil from flowing backwards through
the motor. This way, when the user hits the “reverse” button the cover opens, but the shaft DOES NOT
spin backward. This is a very important aspect of the design which allows the equipment to be simple
and intuitive to operate.

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This is a detail view of the plumbing into the motor. When oil flows forward, the motor spins clockwise
(in this view) and the check valve allows the flow of oil. When oil tries to flow in the reverse direction
the check valve restricts the flow of oil and doesn’t allow it to pass through. The case drain is a typical
function on a hydraulic motor. As oil flows through the motor a small amount leaks out of the seals (by
design) and needs to be drained. The case drain hose brings it back to the skid steer where there is a
special port on most skid steers to accommodate.

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As we’ve shown, this product only has 3 hoses coming off of it. These hoses attach to the skid steer via
industry standard couplers. One hose is forward (typically referred to as “high pressure”), one is reverse
(typically referred to as “low pressure”) and one is for the case drain. All a user has to do to install this
product is attach it to the skid steer with the industry standard quick release plate and connect the 3
hoses.
In my opinion, the features that make this product novel and patent-worth are as follows:
1. The way the beater shaft is integrated with a cover that lifts open
a. This allows manure to be scooped into the bucket without the beater shaft being in the
way.
2. The way the hydraulic system is designed.
a. Specifically, the fact that there are only 2 operator functions (forward and reverse) but
yet the skid steer does 3 things (cover open, cover closed, beater shaft rotate). We do
this by connecting the cover cylinders and the motor in parallel to the same hydraulic
hoses and use a check valve to prevent the shaft from spinning backwards.

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