Pallet shredding machine

Details Pallet shredding machine Pallet shredding machine

1999-09-14

2001-08-07

Ostrager, Allen (Department: 3725)

Solid material comminution or disintegration

Apparatus

Cooperating comminuting surfaces

C241S266000

Reexamination Certificate

active

06270027

ABSTRACT:

FIELD OF THE INVENTION
The invention relates generally to shredding machines, and, more particularly, to pallet shredding machines.
BACKGROUND OF THE INVENTION
Much of the manufactured products and produce moved in commerce are stored and transported on pallets. Pallets are typically constructed to have flat top and bottom surfaces formed of spaced wooden planks nailed to wooden runners, extending generally perpendicular to the planks. The top and bottom surfaces are separated by reason of the runners to form a center area having two open opposite ends where a forklift or other lifting device can easily insert lifting arms to pick up and move the pallet. Pallets are of a standard size and shape, making transportation planning easier which eases the flow and transportation of goods through commerce. While pallets are made of wood strong enough to withstand heavy loads and multiple trips through commerce, pallets can lose their strength due to breakage, moisture or general misuse. Accordingly, unusable pallets need to be discarded, which is widely recognized as a significant disposal problem.
While pallets can be sent to traditional landfills, this can be costly since discarded pallets take up a significant volume of space, much of which is air. By shredding a pallet, the storage space and cost of disposing of a pallet can be significantly reduced. In addition, it is possible to avoid the disposal of pallets by recycling the material that is generated by shredding pallets.
Previous methods of shredding pallets have involved large, complex machines requiring a significant monetary investment due to the complexity of these machines. Many of these machines use constantly moving, medium to high speed, unidirectional blades which are typically operated by large electric motors and large gear reducers to literally shred the pallets into smaller pieces. The high cost of these machines limits their economical use to high volume operations.
SUMMARY OF THE INVENTION
A material shredding device is disclosed which comprises a power source, a first shaft and a second shaft disposed in generally parallel relation and being in communication with the power source for opposite reciprocating rotational movement about respective axes thereof, a plurality of blades attached to the first shaft and the second shaft which are interleaved so as to overlap over a central shredding area and undergo opposite reciprocating rotational movement with the shafts between first and second positions and a material feeding mechanism. The material feeding mechanism has a stationary portion and a moveable door portion that moves on a hinge from a closed vertical position to an open horizontal position where waste material can be inserted. In an alternate embodiment, the entire material feeding mechanism can be pivoted on either a horizontal or vertical axis. The power source is at least one hydraulic cylinder and the hydraulic cylinders transfer power to the shafts through pivoting transfer arms. The shafts are held in place with removable bearing pins. The blades on the respective shafts are alternately disposed over a central shredding opening and the blades reciprocate in unison to grab and shred the waste material.
A method of shredding waste material is also disclosed. The waste material is fed to a material shredding device. The material shredding device has a power source that imparts opposite reciprocating movement to a first and second shaft through pivoting transfer arms. The shafts have blades attached that reciprocate from a first position to a second position, interleaving across a central shredding area, thereby grabbing and shredding the waste material.


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