06481259 is referenced by 45 patents.

A method for precision bending of a sheet of material (

31,41,61,91,231

) along a bend line (

35,45,62-66,96,235

) and the resulting sheet are disclosed. A method includes a step of forming and longitudinally extending slits (

33,43,68,92,233

) through the sheet of material in axially spaced relation to define bending webs (

37,47,71,72,106,237

), forming stress reducing structures such as enlarged openings (

39,49,69,73

) or transversely extending slits (

239

) at each of adjacent ends of pairs of slits in order to reduce crack propagation across the bending webs. In another aspect, the elongated slits (

43,68,92,233

) are formed with pairs of longitudinally extending slit segments (

51,52;74,76;98,99;127

) proximate to and on opposite sides of and substantially parallel to the desired bend line. Longitudinally extending slit segments further are connected by at least one intermediate transversely extending slit segment (

53,77,101,128

). Sheets of slit material suitable for bending also are disclosed.

Title
Method for precision bending of a sheet of material and slit sheet therefor
Application Number
9/640267
Publication Number
6481259 (B1)
Application Date
August 17, 2000
Publication Date
November 19, 2002
Inventor
Max W Durney
San Francisco
CA, US
Agent
Dorsey & Whitney
US
Agent
Robert B Chickering
US
Assignee
Castle
CA, US
IPC
B21D 28/00
View Original Source