Chipper Shredder Development Information
Chipper Shredder Development Information

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Chipper Shredder Description


Ref: Low Speed High Torque Chipper Shredder Machine, Patent 7070132 assigned to Max P. Gassman. Patent was originally assigned to Iowa State University Research Foundation, Inc.

The following is a proposal for a product that would fit well in the product line of a lawn and garden equipment manufacturing company.


Conventional chipper-shredder machines used to reduce yard waste, such as leaves, tree
limbs and other vegetative material, into mulch typically use gasoline engines. However, the noise and exhaust generated by gasoline powered machines is not desirable for residential neighborhoods. To overcome these drawbacks, a low-speed high-torque chipper shredder machine driven by a reversible electric motor has been developed. This machine is capable of grinding yard waste, including limbs and branches, into mulch without the use of high speed knives, blades, or hammers found in conventional chipper-shredders. The shredding mechanism also includes a relief spring that relieves overload on the shredding mechanism and reduces the possibility of plugging. In addition, the reversible motor enables jams to be cleared without disassembly if plugging does occur. As a result, the machine is easy to operate, quiet, reduces noise and dust, and requires about less energy than hammer mills.

Many machines that employ features similar to Patent 7070132 are sold in foreign countries. Some machines were sold in the US with features similar to Patent 7070132 and a 120V 60Hz motor.  Residential shredders  that employ features listed in Patent 7070132 are currently not being sold in the US. Shredders being sold use a threaded screw to hold the shredding plate in place. This arrangement allows adjustment of the plate against the roller; however, it does not eliminate plugging of the machine and requires frequent readjustment. Use of a spring to hold the shredding plate in place greatly reduces plugging of the machine. The spring allows the plate to deflect as needed to accommodate material size and volume.

Since the machines sold in the US do not make use of the plate deflection spring, Machines could be produced for sale in the US that make use of the spring to virtually eliminate plugging of the shredding mechanism. Also, the spring eliminates the need for adjustment. Other features can be similar to machines being produced which essentially utilize the principles outlined in Patent 7070132. The spring can easily be added to existing shredders. A need exists in the United States for a residential shredder that will shred tree limbs up to about 1.5 inches in diameter. This type of shredder fills that need.

I am interested in licensing or accepting royalties on my patent with a manufacturer. Max P. Gassman


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