Chain stretching device

Chain stretching device

  • CN 101,963,215 B
  • Filed: 07/19/2010
  • Issued: 04/27/2016
  • Est. Priority Date: 07/21/2009
  • Status: Active Grant
First Claim
Patent Images

1. a chain stretching device, possesses:

  • tensioner body, and it has the plunger receiving bore of the open cylindrical shape in one end;

    Cylindric plunger, it can slidably insert in above-mentioned plunger receiving bore;

    Force application spring, plunger exerts a force from above-mentioned receiving bore to projected direction by it,Form ratchet mechanism by the multiple tongue and groove being arranged on above-mentioned plunger periphery with the engaging part being arranged on above-mentioned tensioner body, it is characterized in that,Above-mentioned engaging part is elastic ring,The inner peripheral surface of above-mentioned plunger receiving bore near open end has circle-shaped circular groove, this circular groove is formed as;

    to above-mentioned elastic ring can be expanding carry out accommodation keep, and respectively the accommodation sidewall of the outstanding sidewall of above-mentioned plunger projected direction side and accommodation side, direction is made plane of inclination, and the width of this circular groove is formed as;

    the backlash that above-mentioned ratchet mechanism is failure to actuate only have above-mentioned elastic ring and above-mentioned circular groove outstanding sidewall or and hold sidewall contact position between gap lengthAbove-mentioned outstanding sidewall and hold the plane of inclination of sidewall and be formed as, with these two plane of inclination across above-mentioned elastic ring with formed ratchet mechanism above-mentioned plunger tongue and groove corresponding to plane of inclination formed by the different mode of relative angle tilt,The relative angle of the corresponding plane of inclination of above-mentioned accommodation sidewall and above-mentioned plunger tongue and groove is set to;

    to the above-mentioned plunger-actuated load towards holding side when can start by chain, make elastic ring expanding but do not cross the protuberance of tongue and groove, and by chain tension excessive cause to above-mentioned plunger-actuated towards holding the load of side, make elastic ring expanding and cross the angle of the protuberance of tongue and groove.

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