• CN 101,278,143 A
  • Filed: 09/26/2006
  • Published: 10/01/2008
  • Est. Priority Date: 09/30/2005
  • Status: Active Application
First Claim
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1. tension device utilizes the screw section and a spindle unit in a pair of spindle unit that screws togather rotates by spring energized, and another spindle unit is pushed ahead by the rotating force of previous spindle unit transmission under the limited situation of rotation, it is characterized in that,By of reverse move and the abutting part of mutual butt of described another spindle unit at direction of propulsion, be arranged on the position in addition, described screw section in the described a pair of spindle unit,Described abutting part is set at and satisfies following formula (1):

  • R1/R2<

    -tan (μ



    1 ... formula (1)Wherein the contact radius of butt generation is R1,The effective radius of described screw section is R2,The friction factor of the abutting part that is produced by butt is μ

    1,The friction factor of described screw section is μ

    2,The angle of lead of the flank of thread of screw section is α


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