End Thrust Patents (Class 144/261)
  • Patent number: 7082975
    Abstract: The method of bending wood materials inserts cylindrical or board shaped wood material of uniform lateral cross-section into a bending template shaping channel via a driving mechanism to bend the wood material in the shaping channel. Further, the bending method of this invention applies pressure to the front end of the wood material via a braking mechanism to limit its movement in the shaping channel and prevent tension fracture on the stretched side of the curved wood material. Wood material, which is pushed from its aft end and movement limited at its front end, is compressed to control the amount of stretching of the extended outer periphery of the wood material undergoing bending and prevent tension fracture.
    Type: Grant
    Filed: January 14, 2004
    Date of Patent: August 1, 2006
    Assignee: Yamamoto Engineering Works Co., Ltd.
    Inventor: Masato Hirai