Invention Grant
US08770070B2 Universal anti-torque screwdriver head structure 失效
通用抗扭矩螺丝刀头结构

  • Patent Title: Universal anti-torque screwdriver head structure
  • Patent Title (中): 通用抗扭矩螺丝刀头结构
  • Application No.: US13454046
    Application Date: 2012-04-23
  • Publication No.: US08770070B2
    Publication Date: 2014-07-08
  • Inventor: Tsai-Fa Liu
  • Applicant: Tsai-Fa Liu
  • Main IPC: B25B15/00
  • IPC: B25B15/00
Universal anti-torque screwdriver head structure
Abstract:
The present invention discloses a universal anti-torque screwdriver head structure integrally formed and divided into a polygonal insert end and a conical action end, and comprising a plurality of pull-push wings disposed around the action end, a stepped recessed formed between two adjacent pull-push wings and extended inwardly from an open end, and the recess having a longitudinal depth slightly greater than an action hole of a screw of a general specification, and the design of the stepped recess provides high-strength torque and tenacity and fits screws of various different specifications.
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