Patent ID: 6112607
Filing Date: 2000-09-05
Classification: F04B,Y10T

Abstract:
A well head pumping unit, which comprises:(a) a base;(b) a support structure mounted on the base and extending upwardly therefrom;(c) a drive system mounted on the support structure;(d) a crank arm connected to the drive system and rotatable thereby;(e) a pitman arm assembly pivotally connected to the crank arm;(f) a post assembly with a lower end connected to the base and an upper end;(g) a strap guide mounted on said post assembly upper end;(h) a strap assembly with a distal end adapted for connection to a rod string and a proximate end;(i) a constraint link assembly with a lower end pivotally connected to said base and an upper end, said constraint link assembly being connected to said pitman arm assembly distal end in spaced relation from said constraint link assembly lower end;(j) said constraint link assembly engaging said strap assembly in spaced relation from said constraint link assembly lower end;(k) said constraint link assembly having a constraint link strap guide engaging said strap assembly; and(l) said strap assembly proximate end being connected to said base.