US2010162784A1PendingUtilityA1

Flattening device

47
Individually held — no corporate assignee on recordPriority: Dec 31, 2008Filed: Dec 30, 2009Published: Jul 1, 2010
Est. expiryDec 31, 2028(~2.4 yrs left)· nominal 20-yr term from priority
Inventors:John R. ButaJock Buta
B21D 1/02B21B 39/082
47
PatentIndex Score
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Claims

Abstract

A flattening device for flattening a metal workpiece includes a frame; a first tightening assembly at a first end of the frame; a second tightening assembly at a second end of the frame; a series of work rollers interposed between the first tightening assembly and the second tightening assembly, wherein the work rollers include a first upper roller and a second upper roller, and a third, lower roller offset and interposed between the first and second upper rollers; wherein the upper and lower rollers accommodate bends in the workpiece of up to five yield stresses. A method of flattening a sheet of metal includes providing a flattening device for flattening a metal workpiece, providing a first pair of pinch rollers at a first end of the flattening device; providing a pair of pinch rollers at a second end of the flattening device; providing a series of work rollers interposed between the first pair of pinch rollers and the second pair of pinch rollers, wherein the work rollers include a first upper work roller and a second upper work roller, and a third, lower work roller offset and interposed between the first and second upper rollers; and accommodating bends in the sheet of up to five yield stresses as the sheet passes between the upper and lower work rollers.

Claims

exact text as granted — not AI-modified
1 . A flattening device for flattening a metal workpiece, comprising:
 a frame;   a first tightening assembly at a first end of said frame;   a second tightening assembly at a second end of said frame;   a series of work rollers interposed between said first tightening assembly and said second tightening assembly, wherein said work rollers comprise a first upper work roller and a second upper work roller, and a third, lower work roller offset and interposed between said first and second upper work rollers;   wherein said upper and lower work rollers accommodate bends in said workpiece of up to five yield stresses.   
   
   
       2 . The flattener of  claim 1 , wherein said first tightening device comprises a first pair of opposed pinch rollers. 
   
   
       3 . The flattener of  claim 2 , wherein said second tightening device comprises a second pair of opposed pinch rollers. 
   
   
       4 . The flattener of  claim 1 , further comprising back-up rollers for said first and second upper work rollers and said lower work roller. 
   
   
       5 . The flattener of  claim 3 , wherein said first pair of opposed pinch rollers and said second pair of opposed pinch rollers are each driven by a motor. 
   
   
       6 . The flattener device of  claim 3 , wherein said first pair of opposed pinch rollers and said second pair of opposed pinch rollers are vertically shifted by a hydraulic cylinder. 
   
   
       7 . The flattener device of  claim 4 , wherein said upper and lower work rollers are rotated by movement of said workpiece between said upper and lower work rollers. 
   
   
       8 . The flattener of  claim 7 , wherein said upper and lower work rollers rotate corresponding back-up rollers. 
   
   
       9 . The flattener of  claim 8 , wherein said upper and lower work rollers are about 7 inches in diameter. 
   
   
       10 . The flattener of  claim 9 , wherein said back-up rollers are about 7.5 inches in diameter. 
   
   
       11 . The flattener of  claim 10 , wherein said pinch rollers are about 12 inches in diameter. 
   
   
       12 . The flattener of  claim 1 , wherein said upper and lower work rollers are vertically shifted by hydraulic cylinders. 
   
   
       13 . A method of flattening a sheet of metal comprising:
 providing a flattening device for flattening a metal workpiece,   providing a first pair of pinch rollers at a first end of said flattening device;   providing a pair of pinch rollers at a second end of said flattening device;   providing a series of work rollers interposed between said first pair of pinch rollers and said second pair of pinch rollers, wherein said work rollers comprise a first upper work roller and a second upper work roller, and a third, lower work roller offset and interposed between said first and second upper rollers; and   accommodating bends in said sheet of up to five yield stresses as said sheet passes between said upper and lower work rollers.   
   
   
       14 . The method of  claim 13 , further comprising back-up rollers for said first and second upper work rollers and said lower work roller. 
   
   
       15 . The method of  claim 13 , further comprising driving said first pair of pinch rollers and said second pair of pinch rollers via a motor. 
   
   
       16 . The method of  claim 13 , further comprising shifting said first pair of pinch rollers and said second pair of pinch rollers by a hydraulic cylinder. 
   
   
       17 . The method of  claim 13 , further comprising rotating said upper and lower work rollers by movement of said sheet between said upper and lower work rollers. 
   
   
       18 . The method of  claim 13 , further comprising shifting said upper and lower work rollers via a hydraulic cylinder.

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