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A two stage oil filter press having a housing with a precompression chamber and a main compression chamber together with a vertically reciprocating precompression ram and a horizontally reciprocating main compression ram powered by individual fluid cylinders. A feed chute with a scoop is raised thr

A two stage oil filter press having a housing with a precompression chamber and a main compression chamber together with a vertically reciprocating precompression ram and a horizontally reciprocating main compression ram powered by individual fluid cylinders. A feed chute with a scoop is raised through a void in the hopper created by a baffle which insures feeding a measured quantity of spent oil filters to the precompression chamber through a feed window. A main compression chamber is defined at the lower end of the precompression chamber by the lower horizontal end surface of the precompression ram, the floor, a pair of side walls of the precompression chamber, the thrust end of the main compression ram and a discharge door.

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What is claimed is: 1. A press for compressing cans into bales comprising: a housing having a horizontal floor, first and second pairs of horizontally spaced parallel vertical side walls rigidly interconnected and extending upwardly in relation to said floor forming a vertically elongated precompre

What is claimed is: 1. A press for compressing cans into bales comprising: a housing having a horizontal floor, first and second pairs of horizontally spaced parallel vertical side walls rigidly interconnected and extending upwardly in relation to said floor forming a vertically elongated precompression chamber having a rectangular cross section, said first pair of vertical side walls extending to and secured to said floor, a precompression ram in said precompression chamber vertically shiftable between raised and lowered positions and having a flat horizontal lower end, the lower end of one wall of said second pair of vertical walls terminating at the vertical elevation of said lower end of said precompression ram in its lowered position to form an opening for said main compression ram and the lower end of the other wall of said second pair of vertical walls terminating above the vertical elevation of said lower end of said precompression ram in its lowered position to form a discharge opening which is larger in vertical dimension than the opening for said main compression ram, a sliding door at said discharge opening, shiftable between open and closed positions, a main compression ram disposed for horizontal reciprocation through said opening for said main compression ram having a compression end face, said housing including a main compression chamber formed at the lower end of said precompression chamber by said horizontal floor, said first pair of vertical walls, the lower end of said precompression ram when in its lowered position, said door and said end face of said main compression ram, a feed opening in one wall of said first pair of walls and a clean out window in the other wall of said first pair of walls, a can feed hopper adjacent said one wall of said first pair of walls including a shaft at its bottom, a feed chute adjacent said one wall of said first pair of walls including a scoop at its lower end, said feed chute being vertically reciprocatable between a lowered position in which said scoop is in said shaft for receiving cans and a raised position in which said scoop discharges cans into said precompression chamber, and vertically engageable members on said chute and said precompression ram moving said chute between said lowered and raised positions upon said precompression ram moving between its lowered raised and positions, respectively. 2. The press of claim 1 wherein said feed hopper is secured to said one wall of said first pair of walls, said feed hopper including a baffle serving to regulate the amount of spent filters picked up by said scoop. 3. The press of claim 2 including a cover for said baffle. 4. The press of claim 3 including a skirt disposed between said scoop and said scoop, said skirt being telescopically connected to said scoop. 5. The press of claim 4 wherein said scoop has a sloping bottom facilitating discharge of spent filters into said precompression chamber. 6. The press of claim 2 wherein said vertically engageable members include a pair of arms each connected to said precompression ram by connectors including a shear pin. 7. The press of claim 6 wherein said vertically engageable members have a lost motion connection. 8. A press for compressing cans into bales comprising: a main compression ram disposed for horizontal reciprocation having a horizontally facing compression end, a housing having a horizontal floor, first and second pairs of horizontally spaced parallel vertical walls rigidly secured to and disposed above said floor forming a vertically elongated pre-compression chamber having a rectangular cross section, said first pair of vertical walls extending downwardly to said floor, one of said first pair of walls having a feed opening for cans intermediate its upper and lower ends one of said second pair of vertical walls having a horizontal lower end disposed a predetermined distance above said floor thereby defining an opening for said main ram, the other wall of said second pair of vertical walls having a horizontal lower end disposed a predetermined distance above said floor thereby defining a discharge opening, and a door in said discharge opening shiftable between open and closed positions, a pair of parallel support members secured to and extending upwardly from said first pair of side walls, a precompression ram in said precompression chamber vertically adjustable between raised and lowered positions and having a flat horizontal lower end, a double acting linear fluid actuator interconnected between said support members and said precompression ram, said actuator being operable upon contraction to raise said precompression ram and being operable upon extension to lower said precompression ram, a main compression chamber formed at the lower end of said precompression chamber by said horizontal floor, said first pair of vertical walls, the lower end of said precompression ram when in its lowered position, said compression end of said main compression ram and said door, a hopper for cans, and a feed chute for moving cans from said hopper to said feed opening, said feed chute being connected to and for linear vertical movement with said precompression ram. 9. The press of claim 8 having a control center, a position sensor supported on said housing and connected in signal delivery relation to said control center, said position sensor being operable to sense the presence of said lower end of said precompression ram below said feed window, a source of pressure fluid, a solenoid valve connected electrically to said control center, connected to said source of pressure fluid and connected to said linear fluid actuator a pair of conduits for effecting linear extension and contraction, respectively, of said linear fluid actuator, a pressure sensor connected to said conduit effecting extension of said actuator and connected in signal delivery relationship to said control center, said control center automatically adjusting said solenoid valve to cause said actuator to retract thereby raising said precompression ram when pressure in said conduit delivering fluid to said cylinder to extend it exceeds a predetermined valve providing said position sensor does not sense that said precompression ram as being below said feed window. 10. A press for compressing cans into bales comprising: a main compression ram disposed for horizontal reciprocation having a horizontally facing compression end, shiftable between retracted and extended positions, a housing having a horizontal floor and first and second pairs of horizontally spaced parallel vertical walls disposed above said floor forming a vertically elongated pre-compression chamber having a rectangular cross section, said first pair of vertical walls having lower ends rigidly secured to said floor, said second pair of vertical walls having horizontal lower ends disposed above said floor thereby defining an opening for said main ram and a discharge opening, a door connected to said housing and shiftable between open and closed positions in which said discharge opening is open and closed, respectively, one of said vertical walls having a feed opening for receiving cans to be compressed, a precompression ram in said precompression chamber vertically adjustable between raised and lowered positions and having a flat horizontal lower end, a main compression chamber formed at the lower end of said precompression chamber by said horizontal floor, said first pair of vertical walls, the lower end of said precompression ram when in its lowered position, said compression end of said main compression ram in its extended position and said door when in its closed position, a double action linear fluid actuator operatively interposed between main compression ram and said housing, a double acting linear fluid actuator operatively interposed between said precompression ram and said housing; a double acting linear fluid actuator operatively interposed between said door and said housing operable to move said door between its open and closed positions, a feed hopper for cans including a shaft at its bottom adjacent to said vertical wall with said feed opening, a feed chute in juxtaposed relation to said vertical wall having said feed opening, said feed chute having a scoop at its lower end and having a connection with said precompression ram by which it is raised and lowered as said precompression ram is raised and lowered, said scoop, in the lowered condition of said feed chute, said scoop is in said shaft where it receives cans deposited in said hopper and in the raised condition of said feed chute said scoop discharges cans into said precompression chamber, a control system for said press including a computerized control center, a source of pressurized fluid, a solenoid valve for each fluid actuator connected to said source of fluid pressure and in controlled relation to said control center, each of said values have extend contact and hold positions of adjustment, said solenoid valves being connected to its associated fluid actuator by a pair of conduits, for delivery and return to fluid during operation of said press, a pressure sensor sensing fluid pressure delivered to extend each of actuators associated with said precompression and main compression rams, each of said pressure sensors being connected in data delivery relation to said computer center, proximity sensors associated with each of said fluid actuators for detecting the extended condition of said prepress ram, the contracted condition of said main compression ram and the closed position of said door, said proximity sensors being connected in data delivery relation to said control center, said control system having a manual mode of operation and a automatic mode of operation, in said automatic mode the press is operated in a cyclic manner, each cycle including operation of said actuators to effect in sequence the contraction of said precompression ram causing delivery of cans to said precompression chamber, extension of said precompression ram causing precompression of said cans, extension of said main compression ram thereby compressing said cans, slight retraction of said rams, opening of said discharge door, extension of said main compression ram to discharge compressed cans from said main compression chamber and retraction of said main compression ram. 11. The press of claim 10 including a position sensor supported on said housing and connected in signal delivery relation to said control center, said position sensor sensing the presence of said lower end of said precompression ram below said feed window, a fluid pressure sensor connected to said fluid actuator connected to said precompression ram operable to sense fluid pressure effecting extension thereof, said fluid pressure sensor being connected in signal delivery relation to said control center, said control center causing said precompression ram to be retracted and said control system to be converted to manual mode of operation when said pressure sensor senses a pressure rise before the lower end of said precompression ram passes below said feed window indicative of a shearing condition due to foreign material at said feed opening.